close

Вход

Забыли?

вход по аккаунту

?

JP2002027582

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2002027582
[0001]
BACKGROUND OF THE INVENTION The present invention combines a flat speaker to be
produced by one-dimensional surface vibration of a strip-shaped vibrating film in the
longitudinal direction and means for giving a baffle effect to improve and listen to low-frequency
reproduction. The present invention relates to a speaker system that enables space limitation.
[0002]
2. Description of the Related Art A portable personal computer provided with a liquid crystal
display or the like has a space saving effect, and the number of users who use it indoors as a
stationary type is increasing and there is also an increase in such portable personal computers.
There is a demand for broadband music playback that supports various video media and music
sources. However, for this type of portable personal computer, which emphasizes compactness so
as not to be bulky when carried, the contradictory requirements are that the speakers used have
such small size and sufficient low-frequency reproduction ability as not to impair the overall
portability. These stringent requirements have been a drag on development.
[0003]
[0003] FIG. 23 is a longitudinal sectional view showing an example of a conventional flat
loudspeaker developed for the purpose of thinning and high efficiency. In the flat speaker 1
11-05-2019
1
shown in the figure, a flat diaphragm 2 is driven from the back side by a voice coil type exciter
(exciter) 3. The vibrator 3 comprises a voice coil 5 of which one end is bonded to the center of
the back surface of the vibrating film 2 via a piston plate 4 and a columnar magnet 6 coaxially
disposed on the other end side of the voice coil 5. Configured The columnar magnet 6 is
accommodated in a flanged bottomed cylindrical yoke 7 and is assembled to the peripheral
portion of the plate-like back plate 8 holding the buffer sleeve 7a fitted to the cylindrical portion
of the yoke 7 The peripheral portion of the vibrating membrane 2 is fixed to the support frame 9
via a ring-shaped gasket 9a for maintaining the membrane shape. The voice coil 5 is connected
to the ridge of the yoke 7 by a damper 10 whose one end is connected to the side surface
thereof. The conventional exciter 3 causes the piston plate 4 to move in the front-rear direction
by the force of the framing generated in the voice coil 5 when the voice current is supplied to the
voice coil 5 in the magnetic field formed by the columnar magnet 6 to excite the voice current.
The vibrating membrane 2 which is driven and vibrated is adapted to generate a sound pressure.
[0004]
SUMMARY OF THE INVENTION In the above-described conventional flat speaker 1, the vibrating
membrane driving ability of the exciter 3 is proportional to the generated magnetic force of the
columnar magnet 6 and the number of turns of the voice coil 5, so the voice coil If it was
attempted to secure the sound pressure required for practical use without changing the
specifications of No. 5 and the columnar magnet 6, the weight of the vibrating film 2 could only
be reduced. This is because, in order to transmit the applied vibrational energy efficiently to the
atmosphere, it is necessary to statically displace the vibrating membrane 2 in the back and forth
direction while maintaining the plane in the largest possible area. The weight reduction of the
vibrating membrane 2 has been a major mission for speaker developers. However, a vibrating
film suitable for weight reduction generally means the use of an expensive film material, and the
processability decreases as the film material is more expensive, so in reality, it is necessary to use
the vibrating film 2 having a certain weight. It is difficult to obtain an output sound pressure
because the driving efficiency is deteriorated.
[0005]
On the other hand, there has been proposed a planar speaker in which tensile tension is applied
to the four sides of a rectangular diaphragm and the vibrator is driven by a vibrator from the
back side of the diaphragm. However, since such an all-around tension flat-plate speaker is
configured to drive point vibration at the rear center of the diaphragm, the stroke of the
diaphragm is restricted by the length of the short side, and the long side length is It is difficult to
11-05-2019
2
efficiently vibrate the entire film although the bass reproduction ability is poor because it is not
used for low-pass reproduction, and the diaphragm area is large. Therefore, the driving efficiency
decreases as the vertical length is increased, and the output sound pressure decreases. There
were issues such as not being obtained enough. Specifically, for example, when the prototype is
manufactured in a slender shape having an aspect ratio of 3 or more so as to be assembled on
the side of a liquid crystal display, the problem of insufficient bass reproduction ability becomes
remarkable as the aspect ratio increases, there were.
[0006]
Also, in a speaker system in which a conventional flat speaker is disposed on the left and right of
the liquid crystal display, the low frequency reproduction capability of the flat speaker itself is
inferior, so the tendency to increase the volume and play is strong. As the volume increases, the
listening space expands too much, so that the sound is transmitted to the people other than the
operator who operates the personal computer, and there is a problem such as scattering
unnecessary noise around the person. there were. For this reason, if the operator sitting on the
LCD screen and wanting to enjoy playing music on his / her own without disturbing the
surrounding people, he or she can only hear the volume down or wear headphones The
conventional speaker system has a problem that it is very difficult to control a listening space so
that only a person who wants to listen does not listen to a person who wants or does not want to
listen.
[0007]
The present invention solves the above-mentioned problems, and by combining a flat speaker to
be produced by one-dimensional upset vibration in the longitudinal direction of the strip-shaped
vibrating film and means for giving an acoustic baffle effect to this speaker, The purpose is to
improve the area reproduction ability and to limit the listening space.
[0008]
SUMMARY OF THE INVENTION In order to achieve the above object, in the speaker system
according to the invention of claim 1 of the present invention, both short side portions are fixed
ends over the entire length of the side and tension support And a means for applying an acoustic
baffle effect to the flat speaker disposed adjacent to one long side of the flat speaker.
11-05-2019
3
In the speaker system of the invention according to claim 2 of the present invention, the flat
speaker according to the invention according to claim 1 is characterized in that the long side has
a vibrating film whose length is three or more times as long as the short side. I assume. Further,
in the loudspeaker system according to claim 3 of the present invention, the flat loudspeaker
according to the invention according to claim 1 supports a rectangular diaphragm, each short
side of the diaphragm and a portion in the vicinity thereof. A support frame, tension applying
means for applying tension in a direction along the long side of the vibrating membrane, and the
supporting frame held by the support frame, the back surface of the acoustic emission surface of
the vibrating membrane being perpendicular to the membrane surface It is characterized in that
it comprises means for vibrating the vibrating membrane. Further, in the speaker system
according to claim 4 of the present invention, the vibrating membrane according to the invention
according to claim 3 is made of a material provided with uniaxial heat-shrinkability in the
direction of the long side of the rectangle. It is characterized by In the speaker system of the
invention according to claim 5 of the present invention, the means for vibrating according to the
inventions according to claims 3 and 4 is the anti-vibration portion of the vibration generated in
the vibrating membrane by the vibration. A coupler which abuts across the rectangular short side
direction of the vibrating membrane, and a holder which is held by the support frame, is
connected to a substantially central portion of the coupler, and vibrates the vibrating membrane
through the coupler. It is characterized by including a vibrator. In the speaker system according
to claim 6 of the present invention, the coupler according to the invention according to claim 5
has a length equal to the width of the short side of the diaphragm, and a side surface is the
diaphragm It is characterized in that it is a rod-like member to be abutted. Further, in the speaker
system according to claim 7 of the present invention, the coupler according to the invention
according to claim 5 connects the rectangular frame contacting the diaphragm, the rectangular
frame, and the vibrator. And a connecting member. In the speaker system according to claim 8 of
the present invention, the vibration generating means according to the inventions according to
claim 3 and 4 comprises a belly of vibration generated in the vibrating film on the acoustic
emission surface of the vibrating film. A thin plate member bonded across the direction of the
rectangular short side of the vibrating membrane to the portion of the vibrating membrane, held
by the support frame, and abutted against the vibrating membrane from the back surface of the
acoustic emission surface of the vibrating membrane; The vibrator is characterized by comprising
a vibrator for vibrating the thin plate member through a vibrating membrane. In the speaker
system according to claim 9 of the present invention, the vibration generating means according
to the inventions according to claims 3 and 4 is a vibration generated in the vibrating film on the
back surface of the acoustic radiation surface of the vibrating film. A thin plate-like member
bonded across the direction of the short side of the vibrating film to the antinode portion of the
vibrating membrane, and the supporting frame held by the support frame to vibrate the thin
plate-like member in contact with the thin plate-like member It is characterized by including a
vibrator.
11-05-2019
4
In the loudspeaker system according to claim 10 of the present invention, the vibrator according
to the inventions according to claims 5, 8 and 9 has the above-mentioned support so that a
vibrating axis is perpendicular to the vibrating membrane. It is characterized in that it has means
for adjusting the holding angle to the frame. In the speaker system of the invention according to
claim 11 of the present invention, in the support frame of the invention according to the
inventions according to claims 3 and 4, the support frame is in contact with the back surface of
the acoustic radiation surface of the diaphragm. It is characterized in that it comprises a fret,
which is provided on an inner edge portion so as to be in close contact with the vibrating
membrane which is tensioned when the vibrating membrane is heated and contracted, thereby
forming a supporting end of the vibrating membrane. In the speaker system of the invention
according to claim 12 of the present invention, the tension biasing means according to the
inventions according to claims 3 and 4 is an engagement in which the outer portion of the
support frame is pierced. A groove is provided, and a clip member is engaged with the
engagement groove to lock the vibrating membrane in the engagement groove. In the speaker
system of the invention according to claim 13 of the present invention, the tension urging means
according to the inventions according to claims 3 and 4 penetrates the diaphragm at a portion
outside the fret of the support frame. And a screw screwed to the support frame. In the speaker
system according to claim 14 of the present invention, the support frame supports the short side
of the vibrating membrane and the vicinity thereof with the tension urging means according to
the inventions according to claims 3 and 4. And a means for variably adjusting the support
distance of the vibrating membrane in the direction of the long side. In the speaker system of the
invention according to claim 15 of the present invention, the tension urging means according to
the inventions according to claims 3 and 4 is assembled to the support frame, and the acoustic
radiation surface side of the vibrating membrane And a presser which is pressed and abutted to
form the vibration support end. In the speaker system of the invention according to claim 16 of
the present invention, the means for giving an acoustic baffle effect to the flat speaker according
to the invention according to claim 1 is characterized in that any one side of upper, lower, left
and right sides is the flat The display is characterized in that the display is adjacent to the long
side of the speaker. In the loudspeaker system according to claim 17 of the present invention, the
flat loudspeaker according to the invention according to claim 1 is disposed on a support for
supporting a display, and an acoustic baffle is applied to the flat loudspeaker The means for
imparting an effect is characterized in that the upper surface is a desk adjacent to the long side
of the flat speaker.
According to an eighteenth aspect of the present invention, there is provided a speaker system
according to the eighteenth aspect of the present invention, wherein the flat speaker and the
middle to high frequency range reproducing speaker according to the sixteenth aspect of the
present invention And stereo sound reproduction. According to a nineteenth aspect of the
present invention, in the speaker system according to the nineteenth aspect of the present
invention, the flat speaker according to the sixteenth aspect of the present invention is disposed
11-05-2019
5
on the upper or lower side of the display to hold the display screen of the display. , And a
plurality of middle to high frequency range reproduction speakers for reproducing the left and
right sounds, respectively, to perform pseudo stereo sound reproduction. According to a
twentieth aspect of the present invention, there is provided the speaker system according to the
twentieth aspect of the present invention, wherein the flat speaker according to the sixteenth
aspect of the present invention is disposed on the upper side of the display A plurality of middle
to high frequency range reproduction speakers for reproducing sound are disposed to perform
pseudo stereo sound reproduction. In the speaker system of the invention according to claim 21
of the present invention, the flat speaker according to the invention according to claim 16 is
disposed on the lower side surface of the display, and both sides of the short side of the flat
speaker are provided. A plurality of middle to high frequency range reproduction speakers for
reproducing left and right sounds respectively are provided on the surface to perform pseudo
stereo sound reproduction.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to FIGS. 1 to 22. FIG. FIG. 1 is a front view showing a first
embodiment of a speaker system according to the present invention, and FIGS. 2 (A) and 2 (B) are
a perspective view and an exploded perspective view of the flat speaker shown in FIG. ) And (B)
are a front view and a longitudinal sectional view of the flat speaker shown in FIG. 1,
respectively, and FIGS. 4 (A) and 4 (B) are an enlarged cross sectional view of the main part of the
flat speaker shown in FIG. 5 (A) and 5 (B) are respectively a perspective view and a side view
showing a vibration form of the flat speaker shown in FIG. 1, and FIG. 6 is a plan view shown in
FIG. FIG. 7 is a diagram showing sound pressure characteristics of the speaker, FIG. 7 is a
diagram showing sound pressure characteristics for explaining the baffle effect on the flat
speaker shown in FIG. 1, FIG. 8 (A), (B) and (C) are FIG. 9 (A) and (B) are main part enlarged
cross-sectional views showing modified examples of the tension applying means of the flat
speaker shown in FIG. 1, respectively. (C) is an exploded perspective view, a front view and a
longitudinal sectional view showing a first modification of the flat speaker shown in FIG. 1,
respectively, and FIGS. 10 (A) and 10 (B) show the flat speaker shown in FIG. 11A and 11B are an
exploded perspective view and a sectional view of an essential part showing a third modification
of the flat speaker shown in FIG. 1, respectively. 12 (A) and 12 (B) are partial cutaway
perspective views showing a modification of the coupler portion of the flat speaker shown in FIG.
1, and FIGS. 13 (A) and 13 (B) are respectively FIG. 14 (A) and 14 (B) are respectively a
perspective view and a side view showing a vibration form of the flat speaker shown in FIG. 13
and a rear view and a longitudinal sectional view showing a fourth modification of the flat
speaker shown in FIG. 15 (A) and 15 (B) are main part enlarged cross sections respectively
showing another modification of the flat speaker shown in FIG. And some switching 截斜 view of
11-05-2019
6
the sub-diaphragm, FIGS. 16 to 22 are front views showing a second to eighth embodiment of the
speaker system of the present invention, respectively.
[0010]
The speaker system 11 shown in FIG. 1 comprises a pair of flat speakers 11b for reproducing left
and right channels on both sides of the casing of the liquid crystal display 11a, and the liquid
crystal display 11a is for the flat speaker 11b. By functioning as a baffle plate, the low-frequency
reproduction capability is improved, and the listening space can be limited to a specific area on
the front surface of the liquid crystal display 11a.
[0011]
As shown in FIGS. 2 (A) and 2 (B), the flat loudspeaker 11b supports rectangular square framelike portions near two short sides of a rectangular diaphragm 12 called a tensed diaphragm.
Fixedly supported at the short side of the frame 13, the central part of the vibrating membrane
12, that is, the antinode part of the vibrating state is linearly driven from the back side by the
exciter 15 via the rod-like coupler 14 The
The vibrating film 12 is thermally shrunk to a film material such as PEN (polyethylene
naphthalate) or PET (polyethylene terephthalate), or those obtained by metal deposition on them,
or carbon fiber, and this is subjected to the front shape of the rectangular support frame 13 Also,
it is used by forming it into a slightly larger shape in the longitudinal direction. As the vibrating
membrane 12, a high-tensile strength synthetic resin material or a rectangular membrane made
of synthetic fibers which can obtain stable vibration characteristics over a long period of time is
used. The two mutually opposing short sides of the vibrating membrane 12 and the vicinity
thereof are welded to the support frame 13 to form a support end 12a, and a support end for
vibration is formed inside the support end 12a by a fret 23 described later .
[0012]
The vibrating film 12 shown in the present embodiment has a rectangular shape in which the
long side is three or more times the short side, and the length is different depending on the
screen size of the liquid crystal display 11a to be applied. The aspect ratio representing the ratio
of the short side to the side is usually about 8. Further, since the vibrating membrane 12 linearly
drives the antinode portion of the vibration from the back side, the tension from the antinode
11-05-2019
7
portion to the node which is the support end differs depending on the orientation. For this
reason, it does not exhibit the resonance characteristic that the tension from the vibration source
to the peripheral portion resonates remarkably at a single frequency as in a circular diaphragm
in which the tensions in all directions coincide, and has a large number of resonance frequencies.
. As a result, a sufficiently wide reproduction frequency band can be obtained compared to a
circular diaphragm. Furthermore, the long side of the vibrating membrane 12 is an open end, and
the longitudinal tension applied to the short side governs the vibration characteristics. Therefore,
by adjusting the tensile tension in the longitudinal direction by various methods described later,
it is possible to freely realize the frequency characteristic extending from the low band to the
middle high band.
[0013]
The vibrator 15 constitutes a vibrating means together with the coupler 14, and in the case of
the present embodiment, one having the same structure as the conventional vibrator 3 is
employed. That is, as shown in FIG. 4A, the exciter 15 has the piston plate 16 fixed to the back
surface of the coupler 14 in contact with the back center part of the vibrating membrane 12 and
the piston plate 16 fixed to the tip. A voice coil 17, a columnar magnet 18 coaxially disposed on
the other end side of the voice coil 17, a yoke 19 with a bottomed cylindrical shape containing a
columnar magnet 18 and supported by a back plate 22, a voice coil A damper 21 is formed of a
wave-like disc connecting the part 17 to the ridge of the yoke 19.
[0014]
On the other hand, the coupler 14 is a hollow rod-like member having an axial length equal to
the width (length of the short side) of the vibrating membrane 12, and more specifically, it has a
rigidity having a trapezoidal cross section shown in FIG. The upper surface portion is in contact
with the line bisected in the longitudinal direction of the vibrating film 12, ie, the antinode
portion of the vibration, and the bottom portion is in contact with the piston plate 16 It is fixed.
The width of the bottom portion of the coupler 14 is a minimum necessary size to obtain the
bonding strength of the piston plate 16. Further, the width of the upper surface portion of the
coupler 14 is also narrowed in a practically possible range so that the maximum amplitude of the
chordal vibration of the vibrating membrane 12 can be secured. Although the coupler 14 can be
bonded to the vibrating membrane 12, it is merely brought into contact with the back central
part of the vibrating membrane 12 so that the vibrating membrane 12 can be optionally
replaced. However, as shown in FIG. 2, since the vibrator 15 needs to be separately held on the
back side of the vibrating membrane 12, here, the back plate 22 is cross-bridged in the center of
11-05-2019
8
the support frame 13. The vibrator 15 is fixed to the face plate 22. The reference numeral 22 a is
a mounting portion which is formed to be bent to the left and right of the back plate 22, and the
fixing screw 22 b is made to penetrate through the fixing portion 22 a and fixed to the support
frame 13. Thus, the vibrator 15 is pressed and held at the center of the back of the vibrating
membrane 12. A skew adjustment mechanism (not shown) is incorporated to adjust the swing
angle of the vibrator 15 with respect to the back plate 22 so that the axis of the voice coil 17 can
be orthogonally adjusted to the diaphragm 12.
[0015]
As shown in FIG. 3A, the support frame 13 is constructed by connecting a pair of upper and
lower short sides 13a and a pair of left and right long sides 13b in a square frame shape. The
vibrating membrane 12 is temporarily fixed by welding or bonding the support end 12a to the
side surface of the short side 13a of the support frame 13, and a fret 23 having a semicircular
cross section is fixed to the inner edge of the short side 13a. . The frets 23 constitute tension
biasing means for applying a tensile tension in the longitudinal direction to the vibrating
membrane 12, and the tension can be set larger as the height thereof is increased. The tensile
tension given by the frets 23 is a major factor contributing to the reproduction range from the
low frequency side to the middle high frequency side of the flat speaker 11, so the height setting
of the frets 23 according to the required vibration characteristics is is important.
[0016]
When assembling the flat speaker 11, first, the short side of the vibrating membrane 12 and the
vicinity thereof, that is, the supporting end 12a are welded or adhered to the end face of the
short side 13a of the supporting frame 13 Temporarily fix on. When welding the support end
12a, it is performed by heating the short side of the vibrating film 12 and the vicinity thereof
using a high frequency welder or the like. However, since tension hardly occurs in the vibrating
film 12 which is only temporarily fixed by welding or adhesion, it is slightly slackened. Therefore,
a fret 23 having a predetermined height is inserted and fixed to the inner edge of the short side
13a of the support frame 13. As a result, as shown in FIG. 3 (B), the vibrating membrane 12
which has been stretched so far is lifted by the frets 23 and pulled in the longitudinal direction.
The tensile tension in the longitudinal direction is set according to the height of the frets 23, but
since it is a major factor affecting the reproduction range or frequency characteristics of the flat
speaker 11b, it needs to be set carefully.
11-05-2019
9
[0017]
After the assembly of the vibrating membrane 12 to the support frame 13 is completed, the
upper surface of the coupler 14 is pressed against the line bisecting the longitudinal direction of
the vibrating membrane 12, ie, the antinode portion of the vibration, The back plate 22 is
mounted on the center of the support frame 13. In that case, although the coupler 14 abuts on
the central portion of the back surface of the vibrating membrane 12, the vibrating membrane
12 itself is pulled in the longitudinal direction, so that the maximum amplitude of 1 with respect
to the vibrating membrane 12 in the portion where the coupler 14 abuts It is good to attach so
that it may contact | abut with the pressing force of the extent which produces about / 2
displacement. Further, since the swing angle of the vibrator 15 with respect to the back plate 22
can be freely adjusted by the skew adjustment mechanism, the direction in which the coupler 14
is perpendicular to the diaphragm 12 is adjusted using an adjustment jig (not shown) or the like.
Adjust to vibrate.
[0018]
In the flat speaker 11b having the above configuration, when a voice current is supplied to the
voice coil 17 in the magnetic field formed by the columnar magnet 18 to excite it, the force of
the framing according to the magnitude of the current and the number of turns Is generated in
the voice coil 17, and the voice coil 17 vibrates in the axial direction by the force of the frame,
and the piston plate 16 is driven in the front-rear direction. The vibration of the piston plate 16
is transmitted to the vibrating membrane 12 through the coupler 14, and as shown in FIGS. 5 (A)
and 5 (B), the vibrating membrane 12 performs string vibration to generate sound pressure. In
this case, since the vibrating membrane 12 itself is tensioned and tensioned, and vibrates with a
slight pressing driving force, sufficient sound pressure can be generated only by supplying a
minute driving current.
[0019]
Furthermore, since the strip-like vibrating film 12 vibrates like a chord because the long side is
stress-free, a flat speaker using, for example, a PET film of 254 mm long and 40 mm wide (film
thickness 60 μm) In this case, when the central part is point driven with the four sides of the
vibrating film 12 fixed for comparison reference, the lowest resonance frequency, which was 500
Hz, drops to 200 Hz as shown in FIG. The improvement of the ability has been confirmed.
Although the low-pass reproduction ability has been improved, the output sound pressure is
11-05-2019
10
somewhat reduced, but still a sufficient sound pressure improvement effect has been confirmed
as compared with the conventional flat speaker 1 or the like.
[0020]
Further, since the speaker system 11 utilizes the liquid crystal display 11a itself as a baffle for
the flat loudspeaker 11b, in the case of the flat loudspeaker 11b for reproducing the left channel,
the wraparound of the bass through the right side is In the case of the flat speaker 11b for right
channel reproduction, which is blocked by the liquid crystal display 11a, the wraparound of the
bass through the side surface on the left side is blocked by the liquid crystal display 11a. Thus,
neither flat speaker 11b cancels out due to the low-pitched sound coming around through the
left and right side faces, and sufficient low-frequency reproduction is guaranteed in the sound
field in front of the liquid crystal display 11a. That is, for the flat speaker 11b, it is the same as
providing a baffle substantially equal to the flat size of the liquid crystal display 11a, and from
the experiment in which the A2 size baffle was attached to one side, The characteristic
improvement shown in FIG. 7 has been confirmed. More specifically, the sound pressure on the
low band side is improved by nearly 10 dB due to the reduction of cancellation by the
wraparound bass, and it is up to around 90 dB with 0.25 W input when measured on the front
axis 50 cm away from the flat speaker 11b. It is known that sound pressure can be obtained. In
addition, the diaphragm 12 of the flat speaker 11b has a vertically elongated shape, and the
amplitude is smaller as it approaches the end in the longitudinal direction than the normal
diaphragm having a circular or rectangular shape, and the diaphragm 12 in the part closer to the
longitudinal end The structural effect of acting as a baffle, reducing the low-pitched sound
coming around through the upper and lower sides by this baffle effect, and making it difficult for
cancellation of the low-pitched sound to occur is also a major factor in suppressing the lowfrequency reproduction capability decline. .
[0021]
Further, in the case of the speaker system 11 in which the flat speakers 11b having dimensions
of about 250 mm and 40 mm are assembled to the liquid crystal display 11a having a screen size
of 15 inches, the baffle effect is obtained until the distance from the flat speaker 11 b is about 50
cm. Although the sound pressure improvement is clearly confirmed, the baffle effect drops
sharply at a distance of 1 m or more from the flat speaker 11b, so that only the operator who has
sat in front of the liquid crystal display 11a can hear the bass well. On the other hand, it has also
been confirmed that it is difficult for people around whom the baffle effect fades to reach bass.
That is, it can be said that the speaker system 11 is most suitable for listening space limited type
11-05-2019
11
sound reproduction by a personal computer or the like which presupposes mostly personal use
form.
[0022]
As described above, the advantages of the speaker system 11 are twofold. One is the use of the
flat speaker 11b that drives the rectangular vibrating film 12 by string vibration, so that a large
number of resonances that are characteristic of the vibrating film 12 in which the tension from
the antinode to the peripheral part changes with orientation. The presence of the frequency
brings a sufficiently wide reproduction frequency band to the flat speaker 11b, and by variably
adjusting the tension applied to the rectangular diaphragm 12, it is possible to realize flat
frequency characteristics extending to the middle high frequency range. Furthermore, in the case
of string vibration, the portion of the antinode that vibrates vibrates with the maximum
amplitude, so that the entire vibrating membrane 12 is largely driven in the front-rear direction,
and it is easy to obtain the necessary low frequency reproduction capability. The other is to block
the sound that the liquid crystal display 11a, which is baffle means, moves forward from behind
the flat speaker 11b and also because the diaphragm 12 itself has a rectangular shape, it is more
than a regular diaphragm having a circular or square shape. The amplitude is smaller as the
longitudinal end is approached, and the vibrating film 12 in the part near the longitudinal end
functions as a baffle and blocks the sound that is going to be forwarded forward through the
short side, so the liquid crystal display It is possible to provide a wide-range reproduction sound
field space backed by sufficient low-pass reproduction only in a certain area on the front side of
11a.
[0023]
The flat speaker 11b has an advantage other than the above. The vibrator 15 does not have to be
fixed to the back surface of the vibrating membrane 12 and only needs to be in contact with it.
Because the vibrating membrane 12 is tension-supported in one axial direction, no strength is
required for the damper 21 in the vibrator 15. Therefore, the damper 21 does not inhibit the
light movement of the movable portion. Also, since no positional deviation occurs when the
vibrator 15 is brought into contact with the vibrating membrane 12, there is no need to secure
an axial inclination room in the movable part in the vibrator 15. The internal magnetic gap can
be minimized to maximize the magnetic efficiency. Thus, the tension-tension-biased vibrating
membrane 12 can be used as a lightweight but sufficient vibration source to generate a sufficient
volume with a small driving force, and directly connected to the headphone output terminal
attached to the personal computer. Since it can also be driven, it can be widely applied to
11-05-2019
12
speakers for portable personal computers that do not require a special power amplifier. In
addition, since the vibrating membrane 12 is supported by the support frame 13 in a tensioned
state, the flat shape is lost due to the hygroscopic effect with the progress of use like a
conventional flat speaker in which all four sides are basically free ends. There is an advantage
such as being able to constantly maintain high-grade reproduction characteristics without losing
the desire for piston vibration and lacking in vividness in the reproduced sound.
[0024]
Furthermore, since the vibrating film 12 has a long side that is three or more times as long as the
short side, even if the long side is enlarged like a flat speaker in which all the four sides are fixed
to the support frame The area reproduction capability is not limited by the length of the short
side, and rich low-range reproduction is possible by making full use of the string vibration of the
string vibration, and the amplitude is closer to the longitudinal end. Since the longitudinal
direction end of the rectangular diaphragm 12 which becomes smaller and the function as a
baffle becomes apparent blocks the sound that tends to move forward through the short side, the
low frequency reproduction capability is actually reduced. It can be effectively used for low-range
reproduction. Furthermore, since the vibrating membrane 12 is made of polyethylene
terephthalate, polyethylene naphthalate or carbon fiber, it is made of a synthetic resin material
suitable for membrane processing or a synthetic fiber having a high tensile strength and stable
over a long period of time Vibration characteristics can be maintained. Furthermore, by applying
metal deposition to the film material to enhance tensile rigidity, stable vibration characteristics
with almost no deterioration over time can be constantly maintained.
[0025]
Further, the connector 14 is in contact with the antinode portion of the vibrating membrane 12
from the back side in a crosswise manner, and is supported by the support frame 13 and is
connected to a substantially central portion of the coupler 14. A vibrating means is constituted
by a vibrator 15 for vibrating the vibrating film 12. For this reason, the vibration of the vibrator
15 which is a point vibration drive source is converted into a linear drive through the coupler 14,
and the antinode portion of the diaphragm 12 is linearly driven to vibrate, thereby forming a
strip-shaped diaphragm The 12 can be vibrated like a string with certainty. Furthermore, taking
advantage of the characteristic of the vibrating film 12 in which the tension from the antinode
portion to the peripheral portion changes depending on the orientation, a large reproduction
frequency band is obtained from the existence of a large number of resonance frequencies, and
The playback frequency can be lowered. In addition, by adjusting the tension applied to the
11-05-2019
13
vibrating film 12, desired frequency characteristics flat from the low frequency range to the
middle high frequency range can be realized. Further, since the coupler 14 is formed of a hollow
rod-like member having a length equal to the width of the vibrating membrane 12, the rigidity of
the coupler 14 is secured, and the weight reduction of the coupler 14 itself is achieved. The
portion of the belly can be piston-driven firmly to realize ideal vibration.
[0026]
Further, since the fret 23 which is provided on the inner edge of the support frame 13 so as to
project from the back side to define the vibrating end is used as a tension biasing means, the
height of the fret 23 is high. It is possible to increase the tension to be given to the vibrating
membrane 12 and to extend the reproduction range from the low band side to the middle high
band side. Further, since processing of the edge portion where the fret 23 abuts on the vibrating
film 12 can be performed by the fret 23 alone, it is possible to quickly cope with fret processing
or the like according to the required vibration characteristic.
[0027]
In the above embodiment, the fret 23 separate from the support frame 13 is fixed to the support
frame 13 during the speaker assembly process as a tension biasing means. For example, as
shown in FIG. As shown, it is also possible to use a support frame 33 in which the frets 33a
project integrally at the inner edge. In this case, the support end 32a is welded to the support
frame 13 and the vibrating membrane 12 is temporarily fixed to the supporting frame 13. Then,
the entire vibrating membrane 12 is subjected to heat treatment by a flat panel heater or the like
to thermally shrink. Can be granted. That is, it is extremely effective to use the heat shrinkability
of the vibrating membrane 12 as a means for varying the tension other than changing the height
of the frets 33a, and the tension enhancement by such heat treatment and the tension
enhancement by the mechanical method described later By combining the two, it is possible to
set a wide range of tension. That is, it is also a powerful method to mechanically apply tension to
a vibrating membrane which is given a constant tension by heat contraction.
[0028]
Specifically, for example, as shown in FIG. 8 (B), an engagement having a U-shaped cross section
at each central portion of the short side portion of the support frame 43 in which the frets 43a
11-05-2019
14
are integrally provided. The groove 43b is formed so as to extend slightly beyond the width of
the vibrating membrane 42, and the clip rod 44 having an elliptical cross section is engaged with
the engagement groove 43b, and the clip rod 44 is engaged with the engagement groove 43b.
There is a method of variably adjusting tension applied to the heat-shrinkable vibrating film 42
according to the depth. In this case, although the fret 43a, the engagement groove 43b, and the
clip bar 44 constitute a tension biasing means for applying a tensile tension in the longitudinal
direction of the vibrating membrane 42, the vibrating membrane 42 having heat shrinkability is
used. A wide range of tension settings can be made in combination with the tension enhancement
by heat treatment. The support end 42 a is an end that is welded or adhered when temporarily
fixing the vibrating film 42 to the support frame 43.
[0029]
As another mechanical tensioning method, for example, as shown in FIG. 8C, the frets 53a and
the support end of the support frame 53 in which the frets 53a are integrally protruded at the
inner edge. There is also a method of screwing a tightening screw 54 penetrating the vibrating
membrane 52 on the surface between 52a and 52a, and variably adjusting the tension according
to the screwing depth of the tightening screw 54. In this case, for example, by interposing the
washer 55 at the screw-in portion of the support frame 53, the screw-in depth of the tightening
screw 54 can be substantially adjusted. Specifically, for example, tension can be adjusted as
needed by changing the thickness of the washer 55 used or changing the thickness ratio of the
two washers 55 sandwiching the vibrating membrane 52. Also in the case of this example, by
using the vibration film 52 having heat shrinkability, tension setting can be performed in a wide
range together with tension enhancement by heat treatment.
[0030]
Furthermore, as in the flat speaker 71 shown in FIGS. 9A to 9C, the fret 73a protruding from the
inner edge of the support frame 73 and the support frame 73 are provided. The tension biasing
means can also be configured with a frame-shaped expansion spacer 74 that variably adjusts the
support distance. The frame-shaped expansion spacer 74 is formed of a screw inserted in the
connection between the short side and the long side of the support frame 73, and the length of
the long side is connected to the short side by varying the screw feed amount of the screw. The
distance changes, the frame shape is expanded, and the tension applied to the moving film 72 is
adjusted. Since the screw type frame shape expansion spacer 74 can perform screw feeding with
high accuracy in accordance with the feeling of the fingertip, it is possible to perform delicate
tension adjustment which requires accuracy.
11-05-2019
15
[0031]
Also, as in the flat speaker 81 shown in FIGS. 10A and 10B, the J-shaped presser 84 assembled to
the support frame 83 is pressed against the vibrating membrane 82 from the front side and
vibrated The ends may be sectioned. In the case of the present embodiment, the presser 84 is
fixed to the support frame 83 by the fastening screw 85 for loosely inserting the long hole 84a
formed in the presser 84. It is possible to easily adjust the tension applied to the vibrating
membrane 82 by changing. Thus, the necessary tension can be applied without using a fret or
the like. The tip of the presser 84 is curved in a semicircular arc shape so as not to damage the
vibrating membrane 82.
[0032]
Further, as in the flat speaker 91 shown in FIGS. 11A and 11B, a vibrating film 92 is formed of a
rectangular film material having heat shrinkability only in a uniaxial direction orthogonal to the
short side, The thermal contraction of the entire membrane in the longitudinal direction can also
be used to precisely apply the required tension. In the case of the present embodiment, the
folded end itself of the end edge portion of the short side portion of the support frame 93
constitutes the fret 93a, and hence the short side end portion of the diaphragm 92, ie, the
support end 92a is welded to the support frame 93. Alternatively, when the entire vibrating
membrane 92 which has been bonded and temporarily fixed is heated and shrunk, the frets 93a
are in close contact with the vibrating membrane 92 from the back side, and the vibrating
membrane 92 is stretched only in one axial direction (longitudinal direction). Note that heating of
the entire vibrating membrane 92 can be performed using, for example, a flat panel heater, a
warm air machine, an infrared heater, etc., and the vibrating membrane 92 can be contracted
only in one axial direction during heating. Can be given precisely. In this case, since the thermal
stress remaining in the vibrating film 92 becomes the tensile tension as it is, if the tensile tension
decreases temporarily with time, it is possible to easily restore or enhance the tensile tension by
the heating operation again.
[0033]
In the above embodiment, a coupler composed of a hollow rod-like member having a trapezoidal
cross-sectional shape is used, but even the same hollow rod-like member, for example, as shown
11-05-2019
16
in FIG. 12A, has a rectangular cross-sectional shape. It can also be configured with a hooked
hollow rod-like member. In the case of this example, the adhesive surface on the vibrator side is
expanded on both sides by the amount of the weir 104a, and the bonding area on the vibrator
side is larger than the contact area of the coupler 104 with respect to the diaphragm. Further,
the coupler is not limited to the hollow rod-like member but may be constituted by a solid rodlike member, in which case the metal rod of rectangular cross section or the metal rod of circular
cross section can be easily applied and the same weight For example, although the rigidity is
lower than that of the hollow rod-like member, the volume can be small, which can contribute to
thinning of the speaker itself. Furthermore, as in the coupler 114 shown in FIG. 12B, it is also
possible to use a rod member having a concaved cross section whose length is substantially the
same as the width of the vibrating membrane. In the case of this example, by applying a rodshaped metal material having a concave cross-sectional shape, a coupler as rigid as the hollow
rod-like member can be easily obtained, and wasteful occupied space can be reduced compared
to the hollow rod-like member. It can contribute to thinning of the speaker itself.
[0034]
Further, in the above embodiment, the flat speaker having a configuration in which the back
surface central part of the diaphragm is driven by substantially linear portions is taken as an
example, but the flat speaker 121 shown in FIGS. As in the above, the central portion of the back
surface of the vibrating film 122 supported by the support frame 123 with the frets 123a can
also be configured to be driven by a strip portion. The coupler 124 has a long side having
substantially the same dimension as the width of the vibrating membrane 122, and stands in a
direction in which the rectangular frame 124a in contact with the back surface of the vibrating
membrane 122 converges from the rectangular frame 124a. It is extended, and four pillars 124 b
for supporting the vibrator 15 are provided. The support 124b extends in the center direction
from each vertex of the rectangular frame with a very small elevation angle, and the piston plate
16 of the exciter 15 is fixed to the ring portion supported by the tip of the support 124b. The
vibration form of the flat speaker 121 is as shown in FIGS. 14 (A) and 14 (B). That is, since the
portion surrounded by the coupler 124 rectangular frame 124a does not contribute to the length
of vibration, the low-frequency reproduction ability is impaired by that much, but the vibrating
film 122 of the portion surrounded by the rectangular frame 124a is uniform. The vibration in
the front-rear direction can increase the output sound pressure as a whole, and the trade-off
between the low-frequency reproduction capability and the improvement in the output sound
pressure can be arbitrarily determined according to the size of the rectangular frame 124a.
[0035]
11-05-2019
17
Also, the vibration means shown in FIG. 4 can take other embodiments. That is, as shown in FIG.
15 (A), the vibrator 15 is held by the supporting plate 13 and the sub-diaphragm 24 of the thin
plate shown in FIG. 15 (B) bonded to the front side of the vibrating film 12. The vibrating unit 15
can be constituted by a vibrator 15 that abuts on the back side of the vibrating membrane 12 to
vibrate the vibrating membrane 12 in a string. By adopting such a configuration, the vibration of
the vibration exciter 15, which is a point vibration drive source, is converted to linear vibration
via the sub-vibration plate 24, and linear vibration drive is performed on the antinode portion of
the diaphragm 12. The diaphragm 12 can be reliably string-oscillated, and the tension from the
antinode to the peripheral edge of the oscillation changes with orientation to take advantage of
the characteristic of the diaphragm 12 and a large number of resonance frequencies exist, so that
the reproduction frequency is sufficiently wide. While acquiring the band, the lowest
reproduction frequency on the low band side can be lowered, and by adjusting the tension
applied to the vibrating membrane 12, a desired desired flat frequency characteristic from the
low band to the middle high band can be realized. . Further, as shown in FIG. 15 (B), since the
auxiliary diaphragm 24 is formed of a thin plate-like member having a width substantially the
same as the width of the vibrating film 12, the rigidity of the vibrating film 12 is secured. The
weight of the plate 24 itself can be reduced, and the antinode portion of the vibrating membrane
12 can be firmly piston-driven to realize ideal string vibration. In FIG. 15A, the sub-diaphragm 24
is bonded to the front side of the diaphragm 12, the sub-diaphragm 24 is in contact, and the
piston plate 16 is in contact with the back side of the diaphragm 12. Although the vibration
method for vibrating is described, the vibration means is configured such that the sub-diaphragm
24 is bonded to the back side of the vibrating membrane 12 and this sub-diaphragm 24 abuts
the piston plate 16 to vibrate the vibrating membrane 12 by a chord. It can also be configured.
[0036]
Next, a second embodiment of the speaker system according to the present invention will be
described. The speaker system 211 shown in FIG. 16 is configured using a flat speaker 211b
slightly shorter than the flat speaker 11b described above, and is a low-frequency reproduction
flat speaker on the left and right sides of the liquid crystal display 211a. The two-way
reproduction is performed by arranging the flat speaker 211c for middle and high frequency
reproduction in parallel with 211b. The mid-high frequency reproduction flat speaker 211c is
point vibration driven from the back side of a square diaphragm that is tensioned and supported
on all sides and made approximately the same thickness as the low-frequency reproduction flat
speaker 211b. ing. Also in the present embodiment, since the liquid crystal display 211a
functions as a baffle for the low-frequency reproduction flat speaker 211b, sufficient lowfrequency reproduction capability can be exhibited. Also, by sharing the low-pass reproduction
and the mid-high-pass reproduction to the dedicated flat speakers 211b and 211c, the burden on
11-05-2019
18
manufacturing cost increases, but the overall reproduction band can be expanded, and at the
same time the operator It becomes possible to form a free listening space centered on.
[0037]
A third embodiment is shown in FIG. The speaker system 311 shares the low-frequency
reproduction flat speaker 311b with the left and right channels, and a pair of mid-high-range
reproduction flat speakers 311c corresponding to the left and right channels are separately
disposed on the left and right sides of the liquid crystal display 311a. Yes. The low-frequency
reproduction flat speaker 311b shown in the present embodiment is disposed with its long side
adjacent to the upper side surface of the liquid crystal display 311a, and low-frequency audio
signals of left and right channels are mixed to perform monophonic reproduction. . However,
since low-pitched sound has poor directivity, pseudo-stereo reproduction (3D reproduction)
similar to stereo reproduction is performed although reproduction is performed by the speakers
311 b common to the left and right channels. In addition, since the liquid crystal display 311 a
functions as a baffle, an excellent effect can be exhibited also in the low frequency reproduction
capability.
[0038]
As the speaker system 411 shown in FIG. 18 as the fourth embodiment, the low-range
reproduction flat speaker 411b can be disposed adjacent to the lower surface of the liquid crystal
display 411a. In this case, the left and right mid-high-range reproduction flat speakers 411c are
separately disposed on the left and right of the liquid crystal display 411a as in the above
embodiment, and there is no change in the reproduction band. The characteristics will be slightly
different depending on the difference in the speaker height from the floor surface. Generally, the
vertically-long flat low-range reproduction flat speaker 411b is disposed adjacent to the lower
side surface of the liquid crystal display 411a adjacent to the lower side, and the longitudinal
dimension is larger. It can be said that the regeneration ability is high.
[0039]
In the fifth embodiment, as in the speaker system 511 shown in FIG. 19, the low-range
reproduction flat speaker 511b is disposed above the liquid crystal display 511a, and a pair of
mid-high-range reproduction flat speakers 511c is liquid crystal. It can also be configured to be
separately disposed at the lower left and right of the display 511a.
11-05-2019
19
[0040]
Also, as in the speaker system 611 shown in FIG. 20 as the sixth embodiment, the liquid crystal
display 611a is formed by sandwiching the low-frequency reproduction flat speaker 611b
between the middle-high-range reproduction flat speaker 611c for the left and right channels. It
can also be placed at the bottom of the
[0041]
Furthermore, as in the speaker system 711 shown in FIG. 21 as the seventh embodiment, a lowrange reproduction flat speaker 711b is disposed on the front surface of the support 712 of the
liquid crystal display 711a, and a middle-high range reproduction flat speaker 711c. Can be
disposed at the lower left and right of the liquid crystal display 711a.
In this case, the desk 713 on which the support base 712 is placed serves as a baffle for the lowrange reproduction flat speaker 711b.
[0042]
In the eighth embodiment, like the speaker system 811 shown in FIG. 22, the low-range
reproduction flat speaker 811b is sandwiched between the left and right middle-high-range
reproduction flat speakers 811c on the front surface of the support table 812. It can also be
arranged.
Also in the present embodiment, the desk 813 on which the support table 812 is placed serves as
a baffle for the low-range reproduction flat speaker 811 b.
[0043]
In the above embodiment, a liquid crystal display or desk is taken as an example of the baffle
means, but the baffle means may be a radio cassette player or the like, or other AV equipment
etc. What is necessary is just to have a function to prevent the wraparound of sound from behind
the speaker.
11-05-2019
20
[0044]
As described above, according to the speaker system of the present invention, the flat speaker
which drives from the back side the vibrating membrane which is supported with tension by
setting both short sides as the fixed end, and the long side of the flat speaker And a means for
providing a baffle function disposed adjacent to the above, so that the presence of a large
number of resonance frequencies, which is a feature of a vibrating membrane in which the
tension from the antinode portion of the vibration to the peripheral portion changes with
orientation By providing a sufficiently wide reproduction frequency band and variably adjusting
the tension applied to the rectangular diaphragm, it is possible to realize a flat frequency
characteristic extending to the mid-high range, and in addition, in the case of string vibration
Since the part vibrates with the maximum amplitude, the entire vibrating membrane is driven
largely in the back and forth direction, and it is easy to obtain the necessary low frequency
reproduction capability, and the baffle means is flat Because it blocks the sound from coming
around from the back to the front and also because the diaphragm itself is rectangular, the
amplitude becomes smaller closer to the longitudinal end than a regular diaphragm that is
circular or rectangular, and the longitudinal end The vibrating membrane in the near part
functions as a baffle and blocks the sound that tries to move forward through the short side, so it
supports a sufficient low-pass reproduction only in a certain area on the front side of the baffle
means There are excellent effects such as being able to create a wide band reproduction sound
field space.
[0045]
Further, since the flat speaker has a vibrating membrane whose long side is three or more times
as long as the short side, the whole can be elongated as in the longitudinal or transverse
direction, and all four sides are the support frame Like a flat speaker fixed to the lower side, even
if the long side is enlarged, the low frequency reproduction capability is not defined by the length
of the short side, and the length of the string vibration string is fully utilized Sound that a
rectangular diaphragm that can reproduce rich low-pass and has a smaller amplitude toward the
longitudinal end and the function as a baffle becomes apparent, is trying to wrap around forward
through the short side Therefore, the low band reproduction capability can be effectively utilized
for actual low band reproduction, and in particular, it is suitable for a vertically long flat speaker
which is disposed on the left and right sides of a display or the like.
[0046]
Also, the flat speaker is stretched in a direction substantially orthogonal to the short side with
respect to the flat diaphragm, a support frame for supporting the rectangular diaphragm, each
short side of the flat diaphragm and its vicinity, and Since it comprises tension application means
for applying tension and excitation means which is held by the support frame and drives the
vibration film from the back side by string vibration, the tension applied to the rectangular
11-05-2019
21
vibration film can be variably adjusted. By doing this, it is possible to realize flat frequency
characteristics widely extending to the middle and high frequency ranges, and it is not necessary
to fix the vibration means on the back surface of the diaphragm, and it is only necessary to
simply abut. Since the time is short and the vibrating membrane is supported in a uniaxial
direction, no strength is required for the damper in the vibration means, so the damper does not
inhibit the light movement of the movable part, and Exciter It is not necessary to secure an axial
inclination room in the movable part in the vibration means, because the positional deviation
does not occur when bringing the diaphragm into contact with the vibrating film, thereby
minimizing the magnetic gap in the vibration means The efficiency can be maximized, and thus
the tension-tensioned vibrating membrane can be used as a lightweight but sufficient source of
vibration to generate sufficient volume with a small driving force, directly connected to the
headphone output terminal. Because it can be driven directly, it is suitable for speakers for
portable personal computers that do not require a special power amplifier, and because the
diaphragm is supported by a support frame in tension, basically all As in the case of a
conventional flat speaker where the peripheral edge was a free end, the flat shape is lost due to
the hygroscopic effect with the progress of use, and the piston vibration can not be expected and
the reproduced sound lacks vividness Never such an effect such as can be permanently
maintained reproduction characteristics of high quality.
[0047]
Further, the vibration means is held by the coupler which abuts against the antinode portion of
the vibrating membrane from the rear side and the support frame, and is connected to a
substantially central portion of the coupler. And a vibrator for causing the vibrating membrane to
vibrate in a string via the coupler, so that the vibration of the vibrator serving as a point vibration
drive source is converted to linear vibration via the coupler, and the antinode portion of the
vibrating membrane The vibrating membrane can be string-oscillated reliably by linear vibration
or band vibration driving, and by utilizing the feature of the vibrating membrane, the tension
from the antinode portion of the vibration to the peripheral portion changes depending on the
orientation, a large number of resonant frequencies Because a wide reproduction frequency band
can be obtained because of the existence of the lower reproduction frequency band, the lowest
reproduction frequency on the low band side can be lowered. By adjusting the tension applied to
the vibrating membrane, the desired low to mid high band is obtained. To realize frequency
characteristics The effect of the like can be.
[0048]
Also, the excitation means includes excitation by the sub-diaphragm bonded to the front side or
the back side of the vibrating membrane, and the vibrator that causes the sub-diaphragm to abut
11-05-2019
22
against the back side of the vibrating membrane and string vibrates. Since the vibration means is
configured, the vibration of the vibrator, which is a point vibration driving source, is converted to
linear vibration through the sub-vibration plate, and the portion of the vibrating film is linearly
vibrated to ensure that the vibrating film is stringed. Taking advantage of the characteristics of a
vibrating membrane that can be vibrated and tension from the antinode portion to the peripheral
portion of the vibration changes depending on the direction, a large reproduction frequency band
can be obtained since a large number of resonance frequencies exist and The lowest
reproduction frequency on the side can be lowered, and by adjusting the tension applied to the
vibrating membrane, an effect such as realizing desired frequency characteristics flat from low to
middle high can be achieved.
Further, since the auxiliary diaphragm is formed of a thin plate-like member having a width
substantially the same as the width of the diaphragm, the rigidity of the diaphragm is secured,
and the weight of the auxiliary diaphragm itself is reduced. The part is driven firmly by a piston,
and effects such as realizing ideal string vibration are also produced.
[0049]
Further, the vibrating membrane is made of a membrane material having heat shrinkability, and
a portion in the vicinity of the short side is welded or adhered to the supporting frame and
temporarily fixed, and the tension biasing means is the inner edge of the supporting frame The
diaphragm provided in a projecting manner and provided with a fret which is in close contact
with the back side to form a vibrating end from the back side and is tensioned when heating and
shrinking the temporarily fixed diaphragm, so that the end of the diaphragm is welded to the
support frame By temporarily heating and shrinking the entire vibrating membrane from the
outside in that state, the vibrating membrane can be reliably tensioned and the required tension
can be accurately applied. When the tension decreases, it is possible to easily restore or increase
the tension by heating again, and the tension applied to the vibrating membrane increases as the
height of the fret increases, and the tension decreases depending on the tension. Play from the
range side to the middle and high range side The edge can be expanded and the edge portion
where the fret abuts the vibrating membrane can be processed by the fret alone, so that it is
possible to quickly cope with the fret processing etc. according to the required vibration
characteristic. .
[0050]
Further, the tension biasing means is provided at the inner edge of the support frame and is
formed on a fret which is abutted from the back side to the temporarily fixed vibrating
membrane to define the vibrating end, and is drilled on the support frame Since the engaging
groove and the clip member engaging with the engaging groove at the outer side than the fret
11-05-2019
23
and locking a part of the vibrating membrane in the engaging groove are provided, the clip
member in a state where the vibrating membrane is temporarily fixed Is engaged in the
engagement groove, a part of the support end is tightly held between the clip member and the
engagement groove, and the vibrating membrane held by the frictional force acting on the
adhesion surface is the clip The vibrating membrane is supported with a tensile tension
corresponding to the engagement depth of the member, whereby the vibrating membrane
portion sandwiched between the frets can be kept in a proper tension state, and the desired
vibration characteristics can be realized. The heat-shrinkable vibrating membrane that is
tensioned by heat treatment Tensions can be reliably urged to an effect equal extensive
tensioning can be freely.
[0051]
Further, the tension urging means is provided on the inner edge of the support frame and abuts
on the temporarily fixed vibrating membrane from the back side to define the vibrating end, and
the outer part of the vibrating membrane. Since a screw is provided which penetrates the
vibrating membrane and is screwed to the support frame, the screw is screwed into the support
frame in a state where the vibrating membrane is temporarily fixed, and applied to the vibrating
membrane according to the screwing depth of the screw at that time. The thickness of the
washer used can be variably adjusted, for example by adopting a method such as adjusting the
screwing depth of the screw substantially with a washer or the like interposed in the screwing
portion of the support frame. It is possible to adjust tension simply and easily by changing the
pressure, and thereby the mechanical tension can be reliably biased to the heat-shrinkable
vibrating membrane that has been tensioned by heat treatment, and a wide range of tension
adjustment is possible. Play an effect such as That.
[0052]
Also, the tension biasing means is provided on the support frame so as to protrude from the
inner edge of the support frame and abut against the temporarily fixed vibrating membrane from
behind to define the vibrating end, and Since a spacer for expanding the shape of the temporarily
fixed diaphragm is variably adjusted, the diaphragm is temporarily fixed to the supporting frame,
and then the size of the shape of the supporting frame is variably adjusted by the spacer for
expanding the shape. Thus, the tension applied to the vibrating membrane can be freely adjusted,
and for example, by allowing the frame shape to expand according to the screw feed amount of
the screw type spacer, fine tension adjustment can be performed with high accuracy. Thus,
mechanical tension can be reliably biased to the heat-shrinkable vibrating membrane which has
been tensioned by heat treatment, and a wide range of tension adjustment can be freely achieved.
11-05-2019
24
[0053]
Also, the vibrating membrane is made of a membrane material having heat shrinkability, and a
portion in the vicinity of the short side is welded or adhered to the supporting frame and
temporarily fixed, and the tension biasing means is inside the supporting frame It is attached to
the support frame and the fret which is projected on the edge and abuts from the back side to
abut against the temporarily fixed vibrating membrane, and it is assembled to the support frame
and pressed against the vibrating membrane from the front side to define the vibrating end Since
the diaphragm is temporarily fixed to the support frame, the clamp is assembled to the support
frame, and the pressure contact force exerted on the diaphragm is optionally variably adjusted
according to the position of the clamp at that time. For example, by adopting a structure in which
the pressing tool is fixed to the support frame by a fastening screw that loosely inserts the
elongated hole formed in the pressing tool, the loosely inserting position of the fastening screw
with respect to the elongated hole is changed to give tension to the vibrating membrane. Easy
adjustment of tension There, thereby to vibration film after thermal shrinkage imparted with
tension by heat treatment, it is possible to reliably urge the mechanical tension, the effect of
equal wide range of tension adjustment can be freely.
[0054]
Further, since the baffle means is constituted by a display in which any one side of the upper,
lower, left and right sides is adjacent to the long side of the flat speaker, the flat speaker is
formed on the left side or right side or upper or lower side of the display. To use the display as a
baffle, eliminate the cancellation of the low-pitched sound that bypasses the long side of the flat
speaker that is not adjacent to the display and goes forward, effectively enhancing the lowfrequency reproduction capability. It produces effects such as can.
[0055]
Further, since the flat speaker is disposed on a support for supporting a display, and the baffle
means is constituted by a desk whose upper surface is adjacent to the long side of the flat
speaker, the support for the display is placed. Desks can be used as baffles, and it is possible to
effectively eliminate low-frequency reproduction ability by eliminating the cancellation of lowpitched sound that circumvents forward by bypassing the long side of the flat speaker not
adjacent to the desk. Play.
[0056]
Brief description of the drawings
[0057]
11-05-2019
25
1 is a front view showing a first embodiment of the speaker system of the present invention.
[0058]
2A and 2B are a perspective view and an exploded perspective view of the flat speaker shown in
FIG. 1, respectively.
[0059]
FIGS. 3A and 3B are a front view and a longitudinal sectional view of the flat speaker shown in
FIG. 1, respectively.
[0060]
FIGS. 4A and 4B are an enlarged sectional view of an essential part of the flat speaker shown in
FIG. 1 and a partially cutaway perspective view of a coupler portion, respectively.
[0061]
5A and 5B are a perspective view and a side view showing a vibration form of the flat speaker
shown in FIG. 1, respectively.
[0062]
6 is a diagram showing the sound pressure characteristics of the flat speaker shown in FIG.
[0063]
7 is a diagram showing the sound pressure characteristics for explaining the baffle effect for the
flat speaker shown in FIG.
[0064]
FIGS. 8A, 8B, and 8C are enlarged cross-sectional views of relevant parts showing modified
examples of the tension applying means of the flat speaker shown in FIG. 1, respectively.
[0065]
FIGS. 9A, 9B, and 9C are an exploded perspective view, a front view, and a longitudinal sectional
view showing a first modification of the flat speaker shown in FIG. 1, respectively.
11-05-2019
26
[0066]
FIGS. 10 (A) and 10 (B) are an exploded perspective view and a cross-sectional view of essential
parts showing a second modification of the flat loudspeaker shown in FIG. 1, respectively.
[0067]
FIGS. 11 (A) and 11 (B) are an exploded perspective view and a cross-sectional view of essential
parts showing a third modification of the flat loudspeaker shown in FIG. 1, respectively.
[0068]
12 (A) and 12 (B) are partially cutaway perspective views showing modifications of the coupler
portion of the flat loudspeaker shown in FIG. 1, respectively.
[0069]
FIGS. 13A and 13B are a rear view and a longitudinal sectional view showing a fourth
modification of the flat speaker shown in FIG. 1, respectively.
[0070]
FIGS. 14A and 14B are a perspective view and a side view showing a vibration form of the flat
speaker shown in FIG. 13, respectively.
[0071]
15 (A) and 15 (B) are an enlarged sectional view of an essential part showing a fifth modification
of the flat speaker shown in FIG. 1 and a partially cut perspective view of the auxiliary
diaphragm, respectively.
[0072]
16 is a front view showing a second embodiment of the speaker system of the present invention.
[0073]
17 is a front view showing a third embodiment of the speaker system of the present invention.
[0074]
11-05-2019
27
<Figure 18> It is the elevation view which shows the 4th execution form of the speaker system of
this invention.
[0075]
19 is a front view showing a fifth embodiment of the speaker system of the present invention.
[0076]
<Figure 20> It is the elevation view which shows the 6th execution form of the speaker system of
this invention.
[0077]
<Figure 21> It is the elevation view which shows the 7th execution form of the speaker system of
this invention.
[0078]
<Figure 22> It is the elevation view which shows the 8th execution form of the speaker system of
this invention.
[0079]
23 is a front view showing an example of a conventional flat speaker.
11-05-2019
28
Документ
Категория
Без категории
Просмотров
0
Размер файла
52 Кб
Теги
jp2002027582
1/--страниц
Пожаловаться на содержимое документа