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JPS63254894

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS63254894
[0001]
[Industrial field of application] The present invention relates to a flat speaker provided with a rib
in front of a diaphragm. [Conventional technology] In the case of a cone type speaker attached to
a conventional closed enclosure or a bass reflex type enclosure, the speaker is attached to the
baffle plate in front of the enclosure. The vibration of the speaker is transmitted to the enclosure
through the frame of the speaker and the like to resonate the enclosure, and the vibration of the
diaphragm of the speaker causes the air behind the speaker to be compressed and the air
pressure presses the enclosure wall to vibrate. The vibration of the speaker interferes with the
vibration of the diaphragm of the speaker, that is, the acoustic characteristics of the enclosure
affect the sound generation, and the original sound can not be reproduced with high fidelity.
Then, the flat speaker which separated the edge part of the diaphragm of the speaker from the
enclosure, and tried to remove the bad influence of the resonance of the said enclosure etc. with
respect to the sound generation of a speaker is considered. In this flat speaker, since the front
surface area of the diaphragm is large and the strength is insufficient, there is a speaker provided
with a honeycomb structure rib between two diaphragms in order to reinforce this. [Problem to
be Solved by the Invention J However, in such a conventional flat speaker, since the diaphragm is
a flat plate and the area of the screen is wide, the generated sound waves are easily dissipated,
especially in the vicinity of the outer periphery of the diaphragm Turns to the side and back of
the diaphragm, which affects the acoustic characteristics and causes the reproduction sound
quality to deteriorate. An object of the present invention is to provide a flat loudspeaker which
solves the above-mentioned problems with the prior art. [Means for Solving the Problems] The
present invention is configured as follows in order to achieve the above object. That is, in a flat
speaker in which a flat speaker diaphragm is provided inside the enclosure so as not to be in
contact with the enclosure, air containing sound waves is held on the front of the flat speaker
diaphragm and in front of the diaphragm A large number of ribs are provided for delivery and
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the rear side of the enclosure is open. "Since the action J diaphragm is provided with a number of
ribs located in front of it, this rib holds air having sound waves in front of the diaphragm and
sends it forward, and the sound waves are dissipated in the four circumferences of the
diaphragm Prevent the diaphragm from rotating behind the diaphragm, and the diaphragm is
provided inside the enclosure without contacting the hollow frame and the rear side of the
enclosure is open, thus preventing resonance between the diaphragm and the enclosure,
Interference with the back pressure of the enclosure and the diaphragm is prevented, thereby
improving the reproduction sound quality.
[Embodiment] An embodiment of the present invention will be described below with reference to
FIGS. In FIG. 1, reference numeral 1 denotes a reverse T-shaped support base. This support base
1 is provided with a vertical plate 1b at the center of a rectangular horizontal plate 1a provided
horizontally, and two reverses are provided on the lower surface of the horizontal plate 1a. A
conical projection 1c is provided. An angle iM 1 d shown in FIG. 2 is formed at a predetermined
position of the vertical plate 1b. Two supports 1 are mutually spaced apart and arranged in
parallel, and a hollow frame (corresponding to an enclosure) 2 is fitted and supported by f'Q Wi
ld of each of these two supports 1 ing. The hollow frame 2 is formed by forming a cylinder 3
having a rectangular cross section into a rectangular frame shape. Holes 4 are formed at both
ends in the longitudinal direction of the upper and lower portions of the hollow frame 2, and the
holes 4 can be opened and closed by M5 and M5. Reference numeral 6 denotes a guide plate for
guiding the lid 5. In the cylinder 3, baked sand 7 dried by baking sand is densely packed. Further,
U-shaped members 8 and 8 are provided on the upper portion of the hollow frame 2 at
predetermined intervals, and these U-shaped members 8.8 are each provided with a bolt 8a. A
nut 8b is provided. A flange 9 made of a sponge is provided at an inner side clamping portion on
the front side of the hollow frame 2. Of course, the lid 5 is sufficiently fixed not to generate
vibration after the baking sand 7 is filled in the hollow frame 2. Further, at the back of the hollow
frame 2, an attachment frame 10 in which aggregates are assembled in a grid shape is disposed
at a predetermined distance from the hollow frame 2, and this attachment frame 10 is The
hollow frame 2 is mounted parallel to the hollow frame 2 via stepped rods 11 fixedly provided at
the corners. Further, a diaphragm 12 is provided in parallel with the mounting frame 10 with a
distance (about 100 mm in this embodiment) slightly ahead of the mounting frame IO. The
diaphragm 12 is made of balsa material disposed in the directions of arrows C and D which
indicate the fiber direction in FIG. 1, and the upper and lower edges thereof are curved on the
front side (left side in FIG. 2). A circular hole 13 is formed in the central portion of the diaphragm
12, and a large number of ribs 14 cross each other on the front surface of the diaphragm 12 and
are vertically fixed to the front surface of the diaphragm 12. The rib 14 has a cross-sectional
taper shape in which the plate thickness on the diaphragm 12 is larger than the thickness on the
tip side, and the average thickness of the rib 14 is thin at about 1 m 5 mm and the height from
the front surface of the diaphragm 12 Is as high as about 20 mm, and in particular, the height of
the central longitudinal rib 14 is set higher to about 40 mm.
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The voice coil (moving coil) +5, which is a component of the range speaker (for example, mid
range speaker and mid-low range speaker), is removed from the diaphragm 12 at four locations
on the top, bottom, left and right of the rear surface of the diaphragm 12 It is fixed vertically to
the rear surface. On the base of these voice coils 15, a plurality of ribs 15a made of wood pieces
are attached, which are directed in a direction perpendicular to the directions of arrows A and B
which indicate the fiber direction in FIG. 2 respectively. Is bonded to the diaphragm 12. The
diaphragm 12 is made of resin so that only movement in the direction of the arrow AB force
shown in FIG. 2 is permitted and movement in the other direction is prevented inside the hollow
frame 2 without contacting this hollow frame 2 Is suspended by a thread (llffi moving plate
movement restricting means) 16. That is, the vicinity of the edge of the hole 4 at the center of the
diaphragm 12 is attached to and suspended at each other end of the yarn 16 whose one end is
attached near the four corners of the hollow frame 2. On the other hand, at a location facing the
voice coil 15 of the mounting frame IO, a pipe having a permanent magnet, which is a
component of a range speaker (for example, a middle range speaker, middle low range speaker)
excluding the high range A center ball 17 is coaxially fitted with a part of the voice coil 15 and is
mounted by a bolt and nut in a position-adjustable manner. That is, voice coil! ?? The center
ball 17 having a permanent magnet has the same structure as that of a cone in which the cone
(diaphragm) and the frame are removed from the range cone type loudspeaker except the high
range. Therefore, the diaphragm 12. The voice coil I5 and the center ball 17 having a permanent
magnet constitute a range speaker except the high range. Further, as shown in FIG. 2, a cone I8 is
attached to the center circular hole 13 of the diaphragm 12 so as to penetrate the diaphragm 12.
A high frequency range speaker 19 is provided facing the circular hole 13 at a position facing the
circular hole 13 on the rear surface side of the diaphragm 12, and the high frequency range
speaker 19 is bolt adjustable in position to the mounting frame 10 And attached by Nats. When a
midrange speaker is used as the low range speaker except for the high range, a separate low
range speaker separated from the midrange high range speaker is used as the low range speaker.
I assume. Next, the operation of the speaker configured as described above will be described.
First, for example, the midrange and mid-low range components of the output signal of the
amplifier are input to the voice coil 15 and the high range component of the output signal of the
amplifier is input to the high range speaker 19.
Then, the center ball 17 having a permanent magnet. Diaphragm through voice coil I5! 2 vibrates
and the diaphragm of the high range speaker 19 vibrates to generate sound. At this time, a large
number of ribs 14 are provided on the front surface of the diaphragm 12, the ribs 14 are also
provided on the front left and right edges of the diaphragm 12, and the upper and lower edges of
the diaphragm 12 are curved toward the front surface of the diaphragm 12. Therefore, air having
sound waves on the front side of the diaphragm 12 is held by these ribs 14 and pushed out to
the front of the diaphragm 12. The rib 14 also plays a role of reinforcing the diaphragm, but as
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described above, the size is too large to achieve the reinforcing function, and as described above,
the air on the front surface of the diaphragm 12 is retained. To push it forward. Therefore, the
sound wave is prevented from being scattered to the top, bottom, left, and right of the diaphragm
or being rotated to the rear surface side of the diaphragm 12. At this time, since the diaphragm
12 is suspended only by the thread 16 and is a free end, the response to the input signal is
extremely excellent, and the vibration of the diaphragm 12 is transmitted to the hollow frame 2
There is very little, and since the hollow frame 2 is filled with the baking sand 7, the vibration of
the diaphragm 12 and other objects is converted to thermal energy even if it is transmitted.
Vibration and resonance with the hollow frame 2 are reliably prevented. Therefore, the acoustic
characteristics of the enclosure do not greatly affect the sound generation as in the prior art, and
since the four voice coils 15 are provided on the diaphragm 12 at predetermined positions apart
from each other, the divided vibration is generated. In the speaker of this embodiment, since the
pure pronunciation of the sounding body (diaphragm) can be heard immediately, it is possible to
always obtain a very clear high-quality sound. In addition, since the high sound range speaker 19
is fitted to the cone 18 of the circular hole 13 provided at the center of the diaphragm 12, the
sound localization is good, the natural feeling of the sound field is good, and the height is high. It
is also possible to prevent the sound emission sound wave from the range speaker 19 from
rotating to the rear of the high range speaker 19 by the presence of the cone 18 and the
diaphragm I2, which also contributes to obtaining high sound quality. Further, since the
mounting frame IO at the rear of the diaphragm 12 is made of aggregate of grids and the rear of
the diaphragm 12 is open, interference between the hollow frame 2 and the back pressure of the
diaphragm 12 is caused. Can be reliably prevented. When several speakers of the present
embodiment are used, the connecting square rods 20 are inserted into the U-shaped members 8
of the plurality of speakers and fixed by the bolts 8a and nuts 8b. It is good to connect a speaker.
Further, in the case where it is desired to use the speaker of the present embodiment in the
horizontally long state, the support base 1 can be matched to the hollow frame 2 to make this
possible. In the above embodiment, the circular high-range speaker 9 is provided facing the
circular hole 13 and the cone I8, but the invention is not limited thereto, and a rectangular hole
is provided in the diaphragm 12, and this hole A ribbon speaker may be attached to the edge.
Further, in the first embodiment, the high frequency range speaker 9 is provided to face the
circular hole I3, but the present invention is not limited to this, and the circular hole 13 and the
high frequency range speaker are not provided. 12, the voice coil 15, the center ball 17 or the
like may use a full range speaker. Although the diaphragm 12 is provided inside the hollow
frame 2 in the embodiment of the present invention, the present invention is not limited thereto.
The diaphragm 12 having the rib 14 is provided inside the normal enclosure, and the rear
surface side of the enclosure is opened. You may According to the present invention, according
to the present invention, in a flat speaker in which a flat speaker diaphragm is provided inside
the enclosure in a noncontact manner with the surface pressure enclosure, the front surface of
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the flat pressure speaker diaphragm includes sound waves. As it has a large number of ribs that
hold air and send it out to the front of the diaphragm and the back of the enclosure is open, the
ribs on the front of the diaphragm receive the role of reinforcing the diaphragm and vibrate
outside It can serve to hold air on the front of the plate, that is, by providing a large number of
ribs on the front of the diaphragm, it holds air having a sound wave on the front side of the
diaphragm and immediately on the front of the diaphragm. The sound wave can be reliably
delivered to the front of the diaphragm, preventing the sound wave from being scattered around
the diaphragm and from being scattered to the back and forth of the diaphragm, and The
response to input signals can be made extremely good, and the transmission of the vibration of
the diaphragm to the enclosure can be prevented to reliably prevent the vibration of the
diaphragm and other objects from resonating with the enclosure. Furthermore, it is possible to
prevent the interference between the enclosure and the back pressure of the diaphragm, so that
the acoustic characteristics of the enclosure are not greatly influenced on the sound generation
as in the prior art, and the pure sounding of the sounding body (diaphragm) The effect is that it
can be heard immediately and, for this reason, a very clear high-quality sound can always be
obtained.
[0002]
Brief description of the drawings
[0003]
1 to 7 show an embodiment of the present invention, FIG. 1 is a front view, FIG. 2 is a partially
cutaway side sectional view, and FIG. 3 is a perspective view of a diaphragm having a rib, Fig. 4 is
a schematic perspective view showing the rear side of the diaphragm, Fig. 5 is a cross-sectional
view of the main part showing the relationship between a cone provided on the diaphragm and a
high-range speaker, and Fig. 6 is Fig. 1 FIG. 7 is a cross-sectional view taken along the line II--II of
FIG.
2 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Attached is a frame, 12 ииииии Diaphragm, 13 ииииии и
Circular hole (through hole), I 4 и и и и и и и и и и и и и и и и и и Voice coil, 16 и и и и и и и (thread diaphragm
control member) 17 и и и и center ball, 19 ? ? ? Speaker for high range.
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