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JP2008136165

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DESCRIPTION JP2008136165
An object of the present invention is to obtain a speaker which aims to improve directivity in a
direction away from a front axis while preventing a decrease in sound pressure level. A speaker
(10) is coupled to a diaphragm (13), a first equalizer (11) disposed at a central portion of a front
surface of the diaphragm (13) with a predetermined gap, and a baffle (12) or frame. A second
equalizer 14 is disposed so as to cover a part of the diaphragm 13 with a predetermined gap, and
is disposed so as to protrude from the outer peripheral side of the diaphragm 13 toward the
central axis. It is preferable that the surface of the second equalizer 14 directed to the central
axis side of the diaphragm 13 has a curved shape. [Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to a speaker.
[0002]
A conventional high-pitched speaker (tweeter) has, for example, an equalizer 51 (phase
equalizer), a baffle 52 (or frame) connected from the outer periphery of the diaphragm, and a
diaphragm 53, as shown in FIG. have.
[0003]
The equalizer 51 is disposed on the front surface of the diaphragm 53 with a predetermined gap,
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1
and has a disk shape or a donut shape.
In this equalizer 51, since the sound waves emitted from the apex of the dome portion at the
center of the diaphragm 53 and the sound waves emitted from the lower portion of the dome
differ in phase, sound wave interference occurs.
Therefore, the equalizer 51 is disposed to adjust the phase interference, and the design is made
to improve the frequency characteristic of the high-pitched portion of the high-pitched speaker.
[0004]
A large number of patent applications have been filed for the technology relating to a general
equalizer or reflector (reflector). For example, an equalizer formed to cover a part of the front
surface of the diaphragm with a fixed gap from the outer peripheral portion of the diaphragm is
coupled to the periphery of the frame, and the sound wave emitted from the diaphragm is
covered by the diaphragm There is known a speaker with improved directivity, which emits in a
specific direction (a direction having an angle) from a portion where there is no (see, for example,
Patent Document 1). There is also known a speaker that reflects sound waves using a reflector
(reflecting plate) and improves the directivity in the direction opposite to the installation position
of the reflector (see, for example, Patent Document 2).
[0005]
Japanese Patent Application Laid-Open No. 6-311576 Japanese Utility Model Application LaidOpen No. 1-17691
[0006]
Loudspeakers, especially in-vehicle speakers, often can not hear sound in front of the speakers.
In such a case, it is important to improve sound quality by making necessary sound waves flow in
a target direction other than the front of the speaker, that is, in the direction in which a person is
present. However, in the conventional techniques of Patent Documents 1 and 2, although the
directivity characteristics and the like are improved, the sound pressure is lowered, and the
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sound quality can not be sufficiently improved.
[0007]
By the way, in general, deterioration of directivity due to the diaphragm diameter of a speaker
can be expressed by the following equation 1, that is, assuming that the limit frequency is fc, fc =
17000 / a [Hz] (however, a: effective diaphragm It can be expressed by radius (cm). From this
Equation 1, it is difficult for the tweeter having a diameter of 2.5 cm to deteriorate the directivity
at 13.6 kHz or more, and it is difficult to improve the directivity at a frequency of 13.6 kHz or
more using only the equalizer 51 or the reflector. The same type of problem occurs not only for
high-tone speakers but also for mid-tone and low-tone speakers. However, particularly in the case
of a high-pitched speaker in which the diaphragm aperture is reduced, if the limit frequency is
further increased, the diaphragm aperture becomes smaller, so that the radiation area of the
diaphragm becomes smaller, and the sound pressure as the loudspeaker The level drops, and the
radiation efficiency of the speaker is extremely reduced.
[0008]
The present invention has been made to solve the above-mentioned problems, and it is an object
of the present invention to provide a speaker which aims to improve the directivity in the
direction away from the front axis while preventing the reduction of the sound pressure level. Do.
[0009]
In order to solve the problems described above, the speaker according to the present invention is
coupled to a diaphragm, a first equalizer disposed at a central portion of the front surface of the
diaphragm with a predetermined gap, and a baffle or a frame to vibrate A second equalizer
disposed so as to cover a part of the plate with a predetermined gap from the diaphragm and
disposed so as to project from the outer peripheral side of the diaphragm toward the central axis
line side; There is.
[0010]
Further, in another invention, in addition to the loudspeaker of the above-mentioned invention,
the surface of the second equalizer towards the central axis side of the diaphragm has a shape
including a curve.
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[0011]
In addition to the speaker of the above-mentioned invention, in the other invention, the 2nd
equalizer is symmetrically arranged two pieces so that a part of slope part of a diaphragm may
be covered.
[0012]
In addition to the speaker of the above-mentioned invention, other inventions arrange the 2nd
equalizer in the same direction as the diameter direction of the 1st equalizer, or at right angles.
[0013]
Furthermore, in the invention according to the invention, in addition to the loudspeaker of the
invention described above, the diaphragm is a balance dome type, and the second equalizer
covers approximately one half of the slope portion of the diaphragm and has an opposing surface
facing the diaphragm It is a slope.
[0014]
Furthermore, in addition to the speaker of the above-mentioned invention, another invention is
an inner area which is a radially inner area provided with a second equalizer with a baffle or a
frame centered on the central axis of the diaphragm, and an outer area thereof. The outer region
is divided into two, and the inner region is rotatable relative to the outer region.
[0015]
Furthermore, in another aspect of the invention, in addition to the above-mentioned inventive
speaker, the first equalizer is coupled to the inner region.
[0016]
Furthermore, in the invention according to the invention, in addition to the loudspeaker of the
above-described invention, either the vicinity of the outer periphery in the inner region or the
vicinity of the inner periphery in the outer region has curved or acute corners over the entire
periphery The unevenness is continuously formed, and an engagement portion engaged with the
concave portion of the unevenness is formed in the vicinity of the outer peripheral portion in the
inner region and in the other one in the vicinity of the inner peripheral portion in the outer
region.
[0017]
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According to the present invention, it is possible to obtain a speaker in which the directivity in
the direction away from the front axis is improved while preventing the sound pressure level
from being lowered.
[0018]
Hereinafter, speakers according to first and second embodiments of the present invention will be
described with reference to FIGS. 1 to 4.
First, a high-pitched speaker (hereinafter, simply referred to as a "speaker") according to the first
embodiment of the present invention.
) 10 will be described.
As shown in FIG. 1, the speaker 10 according to the first embodiment of the present invention is
referred to as an equalizer 11 similar to the conventional equalizer 51 (hereinafter referred to as
“first equalizer 11”.
And a baffle (or frame) 12 similar to the baffle 52, and a diaphragm 13 similar to the diaphragm
53.
The speaker 10 has a second equalizer 14 in addition to these components.
In the speaker 10, the frequency characteristic in the direction of the front axis of the speaker 10
is improved by phase equalization by the first equalizer 11, and it is set to about 1/2 of the slope
13a (see FIG. 4) of the diaphragm 13. The two second equalizers 14 disposed opposite to each
other also improve the frequency characteristics in the direction away from the front axis.
[0019]
That is, as in the prior art, the first equalizer 11 is disposed at the center of the front surface of
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the diaphragm 13 with a predetermined gap from the diaphragm 13.
Further, the second equalizers 14 and 14 are coupled to the baffle 12 or the frame (here, the
baffle 12 and the second equalizer 14 are integrally formed of the same material), and a part of
the slope portion 13a of the diaphragm 13 Are disposed so as to face the diaphragm 13 with a
predetermined gap on the front side.
With the above-described configuration, the effective diaphragm radius a for determining the
limit frequency fc can be reduced equivalently in only one direction.
The first equalizer 11 is formed to be bridged above the diaphragm 13 by the transfer lines 15
and 15.
[0020]
The surfaces of the second equalizers 14 opposed to each other have a curved shape.
However, the surfaces facing each other may have a combined shape of a curve and a straight
line. As described above, when the external shape (the shape viewed from the front side) of the
surface of the second equalizer 14 facing the central axis of the diaphragm 13 is a curved shape,
the diffraction of the sound wave emitted from the diaphragm 13 is also obtained. It is valid.
However, the surfaces facing each other may be formed as straight lines only. More specifically,
the opposing surfaces of the second equalizers 14 and 14 are, as shown in FIG. 3A, a linear
portion which is a straight line and a curved portion 14a which is a curved line. Alternatively, as
shown in FIG. 3B, only the curved portion 14a may be provided. The side opposite to the
opposing surfaces of the second equalizers 14 and 14 is preferably a tapered surface 14c whose
thickness decreases toward the outside as shown in FIG. It may be shaped.
[0021]
In the speaker 10 according to the first embodiment of the present invention, the second
equalizers 14 and 14 are disposed in the direction perpendicular to the diameter direction of the
first equalizer 11, that is, the direction of the passing line 15. As in the speaker 10A of the
second embodiment of the present invention shown in FIG. 2, the second equalizers 14 and 14
may be disposed in the same direction as the diameter direction (in-line).
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[0022]
In the loudspeakers 10 and 10A according to the first and second embodiments of the present
invention shown in FIGS. 1 and 2, the diaphragm 13 is a balance dome type 75 .mu.m with a
diaphragm diameter .phi.1 (see FIG. 4) of 30 mm. A film diaphragm is used.
The voice coil diameter .phi.2 (see FIG. 4) combined with the diaphragm 13 is 14 mm, and the
outer diameter of the first equalizer 11 is also 14 mm. Further, the second equalizer 14 is
integrally formed of the same plastic as the baffle 12, and the distance D between the two second
equalizers 14 disposed opposite to each other is 20 mm. By controlling this distance D, the limit
frequency fc can be changed, and the frequency characteristic can be adjusted.
[0023]
According to the loudspeakers 10 and 10A according to the first and second embodiments of the
present invention described above, the limit frequency fc in the predetermined direction is
determined by the magnitude of the distance D between the second equalizers 14 and 14
disposed opposite to each other. It is determined. When the radial width W (see FIGS. 1 and 4) of
the second equalizer 14 is set larger than necessary, the area covering the diaphragm 13 is
increased. In this case, since the sound pressure level of the speakers 10 and 10A decreases and
the high frequency range of the frequency characteristics is attenuated, it is not preferable to
increase the width W of the second equalizer 14 to be dark. Here, the width W of the second
equalizer 14 is about 10 mm to 20 mm. As in the present embodiment, when the diaphragm
aperture φ1 is 30 mm, good frequency characteristics can be obtained by using this numerical
value.
[0024]
FIG. 4 is a view showing a cross-sectional structure of the speaker 10 shown in FIG. Here, a
tweeter having a balance dome type diaphragm 13 is illustrated.
[0025]
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7
As shown in FIG. 4, the speaker 10 according to the first embodiment of the present invention
includes a yoke 16 having a disk-like base portion 16a and a cylindrical central portion 16b, a
donut-shaped magnet 17, and A magnetic circuit is formed by the donut-shaped plate 18. The
diaphragm 13 having the dome portion 13 c having a hemispherical convex shape has a
structure in which the horizontal edge 13 b as the outermost periphery is supported by the baffle
12. In addition, a cylindrical voice coil 19 is connected to the diaphragm 13 via a support, and
the voice coil 19 can vibrate in the gap G of the above-described magnetic circuit. As a result, the
vibration of the voice coil 19 is transmitted to the diaphragm 13 to generate a sound.
[0026]
In addition, the first equalizer 11 is disposed so as to cover the dome portion 13 c of the
diaphragm 13, and both ends of the passing lines 15 and 15 on both sides are fixed to the first
equalizer 11 and the baffle 12, respectively. It is supported by the baffle 12. In addition, the
second equalizers 14 and 14 are symmetrically disposed opposite to each other so as to cover
about a half of the slope portion 13 a which is a portion surrounding the dome portion 13 c of
the diaphragm 13, and are integrally formed with the baffle 12. ing. A horizontal connecting
portion 13d is disposed between the dome portion 13c and the sloped portion 13a, and the
second equalizers 14 and 14 cover 1/2 of the total width of the sloped portion 13a and the
connecting portion 13d. It is arranged opposite to. The degree of covering the slope portion 13a
is preferably 1/3 to 3/4, but 3/7 to 4/7 is more preferable in the frequency characteristics. Here,
the opposing surfaces 14d of the second equalizers 14 and the diaphragm 13 are sloped and
curvilinear in shape. As described above, the diaphragm ring 20 is disposed on the upper side in
FIG. 4 of the plate 18 in order to support the diaphragm 13 and the like.
[0027]
The deterioration of the directivity is expressed by Equation 1, and the limit frequency differs
depending on the distance D between the second equalizers 14 and 14 symmetrically disposed
opposite to each other on the diaphragm 13. Since the distance D can not be smaller than the
aperture of the first equalizer 11, the distance D is usually larger than the aperture of the first
equalizer 11. As a result of the experiment, it is preferable to cover 1/2 of the total length of the
slope portion 13a and the connection portion 13d of the balance dome type diaphragm 13, and
to minimize the distance of at least the wavelength of the improved frequency. That is, the
effective diaphragm radius a obtained by Equation 1 becomes the minimum value. For example,
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8
assuming that the target value is 20 kHz in order to improve the limit frequency fc, the effective
diaphragm radius a is 8.5 mm and the effective diameter of the diaphragm 13 is 17 mm
according to Equation 1. Therefore, the minimum value of the distance D between the second
equalizers 14 is 17 mm. For this reason, when covering the 1⁄2 of the total length of the slope
portion 13a of the balance dome type diaphragm 13 and the connection portion 13d, if the
distance D is 17 mm, the target value can be cleared and the frequency Properties are preferred.
The second equalizers 14 are disposed so as to project from the outer peripheral side of the
diaphragm 13 toward the central axis, that is, disposed so as to cover at least a part of the slope
portion 13a, and the distance D is 17 mm. With the above, it is possible to obtain a speaker in
which the directivity in the direction away from the front axis is improved (the target value is
improved to 20 kHz or a value close thereto) while preventing the sound pressure level from
being lowered.
[0028]
FIG. 5 is a diagram showing the frequency characteristics of the loudspeakers 10 and 10A
according to the first and second embodiments of the present invention, and is shown in the
sense of comparison with the conventional example shown in FIG. In both FIG. 5 and FIG. 11, X
indicates the frontal characteristic, Y indicates the characteristic in the horizontal direction (= the
direction parallel to the arrangement direction of the second equalizer 14) at the directivity of 30
degrees, and Z indicates the directional characteristic The characteristic of the vertical direction
(= direction perpendicular to the arrangement direction of the second equalizers 14 and 14) at
30 degrees is shown.
[0029]
As apparent from the comparison between FIG. 5 and FIG. 11, in the embodiment of the present
invention, by arranging the second equalizers 14, 14 symmetrically, that is, facing each other, the
horizontal direction at 10 kHz or higher The directivity characteristic (Y) of can be significantly
improved. For example, in the vicinity of 11 kHz to 12 kHz, in FIG. 11 of the conventional
example, the directivity characteristic (Y) in the horizontal direction drops sharply from about 87
dB to about 76 dB. On the other hand, in the embodiment of the present invention, as shown in
FIG. 5, the sound pressure drop is suppressed to about 87.5 dB to about 78 dB around the same
11 kHz to 12 kHz. Further, in the vicinity of 20 kHz, the directivity characteristic (Y) in the
horizontal direction is less than 80 dB in the conventional example (see FIG. 11), but in the
embodiment of the present invention, 80 dB or more is secured.
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[0030]
Also, even at 2 kHz to 10 kHz, particularly in the vicinity of 5 kHz, in the conventional example,
three graphs (Speaker Front Characteristic (X), Horizontal Directional Characteristics (Y), Vertical
Directional Direction Characteristics (Z)) In particular, in the embodiment of the present
invention, it can be seen that the three graphs are grouped in the same region in this range, while
the directional characteristic (Y) in the horizontal direction is low (see FIG. 5).
[0031]
Furthermore, in the speakers 10 and 10A, the first equalizer 11 is provided on the front surface
of the diaphragm 13 to flatten the frequency characteristics, and the front surface of the
diaphragm 13 is on the horizontal surface of the diaphragm 13 The critical frequency fc of the
sound wave is raised by the second equalizers 14 and 14 which have opposite faces 14 d that are
inclined diagonally, and in which the opposite faces are curved or straight and curved.
[0032]
The limit (frequency) of directivity is expressed by Equation 1 as described above, but the shape
of the opposing surface 14d of the second equalizer 14, 14 with the diaphragm 13 is sloped and
curved (= curved surface It can be seen that the frequency characteristic is smoother compared
to the conventional example shown in FIG. 11 without being influenced by the standing wave.
The more parallel the gaps between the second equalizers 14 and 14 and the diaphragm 13, the
greater the effect obtained, but the better in terms of frequency characteristics, the better the
obliqueness. The effect of collecting at the center of the diaphragm 13 is obtained.
According to the frequency characteristic of the conventional one shown in Patent Document 1, a
constant gap between the diaphragm and the equalizer is easily influenced by a standing wave,
and a wave characteristic is assumed in the frequency characteristic. In particular, when the
amplitude is large, non-linear distortion of air becomes large, which causes noise. On the other
hand, in the speakers 10 and 10A, such a problem is eliminated.
[0033]
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10
In addition, in order to eliminate the bias of directivity, it is preferable to attach the second
equalizers 14 and 14 at symmetrical positions as in each embodiment. The thickness of the
second equalizer 14 is preferably about 5 mm. The thickness needs a certain thickness in
consideration of reflection of sound waves, and preferably 3 mm to 10 mm. If it is 10 mm or less,
it is advantageous in terms of thinning. Although the width W of the second equalizer 14
depends on the diaphragm aperture φ1, the width W is effectively 10 mm to 20 mm when the
diaphragm aperture φ1 is 30 mm as in the present embodiment. , 12 mm to 17 mm are more
effective.
[0034]
As described above, according to the speakers 10 and 10A according to the first and second
embodiments of the present invention, the limit frequency fc determined from the diaphragm
aperture φ1 can be increased. In the conventional configuration, when the diaphragm aperture
φ1 is 30 mm, the limit frequency is 11.3 kHz. However, when the present invention is adopted,
when the distance D is 20 mm, theoretically it can be expanded to 17 kHz, and FIG. As can be
seen from the graph, it can be seen that the decrease in sound pressure level in the high range of
the front axis of the speakers 10 and 10A is also small.
[0035]
Further, according to each embodiment of the present invention, by disposing the second
equalizer 14, the directivity characteristic in the set direction is equivalent to the decrease of the
apparent aperture of the diaphragm 13. Thus, the directivity can be improved. As described
above, the directivity is different between the directivity characteristic in the direction set by the
second equalizer 14 and the direction not set and the directivity can be controlled. According to
the embodiment of the present invention, the frequency characteristic in the direction away from
the frontal axis is improved, and the speaker is improved in directivity.
[0036]
Furthermore, the in-vehicle speaker has the following advantages. That is, in many cases, it is not
possible to hear the sound in front of the speaker in the in-vehicle speaker, but in the speakers
10 and 10A of the embodiment of the present invention, the sound quality in the high range is
controlled by controlling the sound wave necessary in the target direction. It is possible to
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11
improve. As is apparent from the comparison between FIG. 5 and FIG. 11, in the embodiment of
the present invention, the installation of the second equalizer 14 enables the specific direction
(horizontal direction in the above embodiment) to be required. It becomes possible to provide the
speakers 10 and 10A which improved directivity characteristics. By appropriately changing the
installation position of the second equalizer 14, it is possible to specify (select) in which direction
the directivity characteristics of the speakers 10 and 10A should be improved.
[0037]
Next, a speaker 30 according to a third embodiment of the present invention will be described
with reference to the drawings. In the loudspeaker 30 according to the third embodiment, the
same reference numerals are attached to the same items as the first and second embodiments,
and the description thereof will be omitted or simplified.
[0038]
FIG. 6 is a view showing an appearance structure of the speaker 30 according to the third
embodiment of the present invention.
[0039]
As shown in FIG. 6, the speaker 30 according to the third embodiment of the present invention
has a first equalizer 11, a diaphragm 13, a second equalizer 14, and a baffle 32.
The first equalizer 11 is disposed at the center of the front surface of the diaphragm 13 with a
predetermined gap with respect to the diaphragm 13. The baffle 32 is divided into two regions
along a boundary line indicated by a circumference H centered on the central axis of the
diaphragm 13, and the movable baffle 34 which is the inner region and the outer region thereof.
And a fixed baffle 36. That is, the movable baffle 34 is formed in a donut shape in the inner
region of the circumference H, and the fixed baffle 36 is formed to cover the outer periphery
thereof. The fixed baffles 36 are fixed to the plate 18 (see FIG. 7). The movable baffle 34 is
rotatable relative to the fixed baffle 36 about the central axis of the diaphragm 13.
[0040]
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12
The second equalizer 14, 14 is coupled to the movable baffle 34. Here, the movable baffle 34 and
the second equalizer 14 are integrally formed of the same material. The first equalizer 11 is
coupled to the moveable baffle 34 by the pass lines 15, 15. Therefore, when the movable baffle
34 is rotated, the first equalizer 11 and the second equalizers 14 and 14 integrally rotate with
the movable baffle 34. As described above, by integrally rotating the first equalizer 11 and the
second equalizers 14 and 14 with the movable baffle 34, it is possible to adjust the direction in
which the directivity of the second equalizers 14 and 14 becomes good. it can.
[0041]
FIG. 7 is a view showing the cross-sectional structure of the speaker 30 according to the third
embodiment of the present invention.
[0042]
As shown in FIG. 7, the speaker 30 according to the third embodiment of the present invention
forms a magnetic circuit by the yoke 16, the magnet 17 and the plate 18.
The diaphragm 13 has a structure in which the edge 13 b is supported by the fixed baffle 36.
Further, a cylindrical voice coil 19 is connected to the diaphragm 13 via a support.
[0043]
As described above, the baffle 32 is composed of the movable baffle 34 and the fixed baffle 36.
The first equalizer 11 is disposed so as to cover the dome portion 13 c of the diaphragm 13, and
both ends of the passing lines 15 and 15 on both sides are fixed to the first equalizer 11 and the
movable baffle 34, respectively. It is supported by the baffles 34. In addition, the second
equalizers 14 and 14 are integrally formed with the movable baffle 34. As shown in FIG. 7, the
movable baffle 34 has an extending portion 34 a extending outward from the lower side of the
second equalizer 14, 14. The extending portion 34 a is provided on the outer side in the
circumferential direction of the donut-shaped movable baffle 34 over the entire circumference.
Further, also in the present embodiment, the opposing surface 14d of the second equalizers 14
and 14 and the diaphragm 13 is formed to have a slope and a curved shape.
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13
[0044]
The stationary baffle 36 is fixed above the plate 18. The stationary baffle 36 extends upward
from the outer edge of the ring-shaped base portion 36a fixed to the plate 18 and the outer
periphery of the extending portion 34a from the outer edge of the base portion 36a and further
extends inward. And a cover portion 36b. On the inner peripheral side of the base portion 36a
and on the back side, a back step portion 36c notched in the form of a step toward the upper
side is formed over the entire circumference. The fixed baffle 36 is fixed to the plate 18 by fitting
the outer peripheral side of the plate 18 to the back step 36 c and interposing an adhesive or the
like between the two. Further, on the inner peripheral side of the base portion 36a and on the
front side, a front step portion 36d cut in a low step shape toward the lower side is formed over
the entire periphery. The edge 13 b of the diaphragm 13 is fitted into the front stepped portion
36 d to be positioned, and the diaphragm 13 is fixed to the baffle 32 with an adhesive. The edge
13b may be bent vertically downward without forming the front step 36d, and the edge 13b may
be fixed to the inner peripheral surface of the fixed baffle 36.
[0045]
The movable baffle 34 is rotatably held relative to the fixed baffle 36 by the extension 34 a being
accommodated in the space between the cover 36 b and the base 36 a. Further, a positioning
mechanism 38 for positioning the movable baffle 34 with respect to the fixed baffle 36 is
provided on the surface 34 b of the extension 34 a and the back surface 36 e of the cover 36 b
(see FIGS. 8 and 9).
[0046]
FIG. 8 is a view for explaining the configuration of the asperities 40 constituting a part of the
positioning mechanism 38, and (A) is a partial perspective view of the movable baffle 34
provided with the asperities 40, (B ) Is a front view of the unevenness 40 seen from the direction
of the arrow J in (A). FIG. 9 is a view for explaining the configuration of the engagement portion
41 which constitutes a part of the positioning mechanism 38, and (A) is a partial perspective
view of the fixed baffle 36 provided with the engagement portion 41. 7B is a perspective view of
a plate-like spring 42 that constitutes the engaging portion 41. FIG.
[0047]
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14
The positioning mechanism 38 is composed of an unevenness 40 formed on the surface 34b of
the movable baffle 34 and an engaging portion 41 formed on the back surface 36e of the cover
36b of the fixed baffle 36 (see FIGS. 8 and 9). . As shown to FIG. 8 (A), the unevenness |
corrugation 40 is formed over the perimeter of the surface 34b in the extension part 34a. The
surface shape of the unevenness 40 is formed in a smooth wavy shape as shown in FIG. 8 (B).
The shape of the unevenness 40 is not limited to a smooth wavy line, but may be another form in
which an acute-angled triangular unevenness or a smooth square unevenness is continuously
formed.
[0048]
The engagement portion 41 is configured by attaching a metal plate-shaped spring 42 to the
back surface 36 e. The plate-like spring 42 is, as shown in FIG. 9B, a curved portion 42a obtained
by curving a metal flat plate into a substantially U shape, and a flat plate-like shape extending
outward from both ends of the curved portion 42a. And flat portions 42b and 42b. The degree of
curvature of the curved portion 42 a is formed to be substantially the same as the cross-sectional
shape of the recess 40 a of the unevenness 40.
[0049]
The plate spring 42 is attached to the cover 36 b by fixing the flat portion 42 b to the back
surface 36 e (see FIG. 9A). As a method of fixing the plate-like spring 42, an adhesive may be
interposed between the back surface 36e and the flat plate portion 42b, or the flat plate portion
42b may be screwed to the back surface 36e. The engaging portion 41 is not limited to the metal
plate spring 42, and may be made of a resin plate member having a curved portion 42a, or
protrudes downward from the back surface 36e. It may be a protrusion. Further, the shape of the
curved portion 42a may be an acute triangle or a smooth quadrangle corresponding to the shape
of the unevenness 40.
[0050]
When the movable baffle 34 is positioned on the fixed baffle 36 in the positioning mechanism
38, the curved portion 42a is fitted in the recess 40a, and both are in surface contact. In this
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15
state, since the protrusions 40b exist on both sides of the curved portion 42a, the movement of
the movable baffle 34 in the circumferential direction is restricted. However, when a force
directed in the circumferential direction is applied to the movable baffle 34, the curved portion
42a bends, moves over the convex portion 40b, and moves to the adjacent concave portion 40a.
As described above, by rotating the movable baffle 34 in the circumferential direction and
engaging the curved portion 42a with the predetermined recess 40a, the second equalizers 14
can be positioned at the predetermined position. Further, when the movable baffle 34 is rotated,
the curved portion 42a moves in the circumferential direction while passing over the convex
portion 40b, so that a click feeling can be obtained.
[0051]
As described above, according to the speaker 30 according to the third embodiment of the
present invention, the movable baffle 34 is rotated even before or after the installation to the
installation position of the door panel etc. The second equalizer 14 allows the direction in which
the directivity is improved to be easily adjusted. Therefore, it is possible to control the sound
wave necessary in the target direction and to improve the sound quality of the high sound range
without being influenced by the mounting position of the speaker 30. In particular, in an onvehicle speaker, the speaker is often attached to various positions such as a lower portion in
front of a front door of a vehicle. For this reason, there are many cases where it is not possible to
hear the sound in front of the speaker. In such a case, by rotating the movable baffle 34 and
stretching the line connecting the second equalizer 14 and 14 vertically to the front of the
speaker 30, the ear is brought to the vertical plate, It is possible to obtain higher tone quality in
the target direction. Therefore, without changing the installation position of the speaker 30 each
time, it is possible to improve the directivity in the necessary direction only by rotating the
movable baffle 34.
[0052]
Further, in the speaker 30, since the positioning mechanism 38 for positioning by engaging the
engaging portion 41 with the unevenness 40 is adopted, the movable baffle 34 can be positioned
by a simple mechanism. Therefore, the mechanism of the speaker 30 can be prevented from
being complicated. Moreover, since a click feeling can be obtained at the time of positioning, it
becomes easy to recognize the position for positioning.
[0053]
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Although the embodiments of the present invention have been described in detail with reference
to the drawings, the specific configuration is not limited to the embodiments, and various
modifications can be made without departing from the scope of the present invention.
[0054]
For example, in each of the embodiments described above, two second equalizers 14 are
disposed to face each other, but the second equalizer 14 may be one or three or more.
Further, although the surface of the second equalizer 14 directed to the central axis of the
diaphragm 13 includes a curved line, it may be formed only by a straight line.
[0055]
Further, in the above-described speakers 10 and 30, the two equalizers 14 and 14 are arranged
symmetrically with respect to the linear direction of the first equalizer 11, that is, the bridging
direction of the passing line 15, and in the speaker 10A, The two second equalizers 14 and 14
are symmetrically arranged in the same direction as the linear direction of the first equalizer 11,
but the arrangement direction of the second equalizers 14 and 14 is in the linear direction of the
first equalizer 11. Alternatively, they may be arranged to intersect at an angle of 45 degrees, or
may be arranged to intersect at another angle. Also, even in the case where only one second
equalizer 14 is disposed, the linear direction or the orthogonal direction of the first equalizer 11
is preferable, but may be disposed at another position.
[0056]
Further, although the second equalizer 14 is integrated with the baffle 12 and the movable baffle
34, it may be formed by another member and fixed to the baffle 12 or the movable baffle 34.
Furthermore, the opposing surface 14 d of the second equalizer 14 that faces the diaphragm 13
is a sloped curved surface that is closer to the diaphragm 13 as it goes closer to the central axis
of the diaphragm 13. The plane perpendicular to the central axis, that is, the plane extending in
the horizontal direction in FIG. 4 (in this case, the distance between the diaphragm 13 and the
second equalizer 14 is considered constant), or the closer to the central axis, the more vibration
occurs. It may be a linear slope approaching the plate 13 side. As described above, when the
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facing surface 14d is a slope such as a slope having a curved cross section or a straight slope, the
standing wave is difficult to get on and the frequency characteristics are smooth.
[0057]
When the present invention is applied to a diaphragm in which the diaphragm is flat without a
slope portion or in which the diaphragm has a flat portion or the like on the outer periphery of
the slope portion, the second equalizer is used. 14 does not necessarily have to cover the slope.
The second equalizer 14 may be disposed so as to protrude from the outer peripheral side of the
diaphragm to the central axis side. Furthermore, the first equalizer 11 may be omitted if, for
example, the flattening of the frequency characteristic may be sacrificed a little. Moreover, in
each embodiment mentioned above, although the speaker for high sound was illustrated, this
invention is applicable also to the speaker for middle sound, and the speaker for low frequencies.
The present invention is preferably applied to an on-vehicle speaker, but can be applied to a
speaker for other applications.
[0058]
In the third embodiment described above, although the second equalizer 14 is integrated with
the movable baffle 34, the second equalizer 14 is fixed to another member such as a frame, and
the frame or the like is fixed. It may be made rotatable. Further, the movable baffle may be on the
outer peripheral side, the second equalizer 14 may be integrated, and the inner peripheral side
may be a fixed baffle. Alternatively, one of the two second equalizers 14 may be fixed to the
movable baffle and the other may be fixed to the fixed baffle.
[0059]
Further, in the third embodiment described above, the unevenness 40 is formed on the surface
34b and the engaging portion 41 is provided on the back surface 36e, but, conversely, the
engaging portion 41 is provided on the surface 34b, The unevenness 40 may be formed on the
back surface 36e. In addition, without providing the unevenness 40, the surface 34b may be
configured to be in contact with the engaging portion 41 as a flat surface. With such a
configuration, the movable baffle 34 is positioned by the contact force between the surface 34 b
and the engagement portion 41, and the second equalizer 14 can be positioned at an arbitrary
position.
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[0060]
In the third embodiment described above, the positioning mechanism 38 is provided on the
surface 34 b of the movable baffle 34 and the back surface 36 e of the fixed baffle 36, but the
position of the positioning mechanism 38 is not limited to this position. For example, it may be
provided at another position such as the outer peripheral side of the extending portion 34 a of
the movable baffle 34.
[0061]
It is a figure which shows the external appearance structure of the speaker in connection with
the 1st Embodiment of this invention.
It is a figure which shows the external appearance structure of the speaker in connection with
the 2nd Embodiment of this invention. 2A and 2B are diagrams showing an example of a second
equalizer of the speaker shown in FIGS. 1 and 2, wherein FIG. 6A is a diagram showing that the
surface toward the central axis of the diaphragm is composed of a curved portion and a linear
portion; 2.) is a figure which shows that the surface which goes to the said central axis line
consists only of a curve part. It is a figure which shows the cross-section of the speaker in
connection with the 1st Embodiment of this invention. It is a figure which shows the frequency
characteristic of the speaker in connection with the 1st, 2nd embodiment of this invention. It is a
figure which shows the external appearance structure of the speaker in connection with the 3rd
Embodiment of this invention. It is a figure which shows the cross-section of the speaker in
connection with the 3rd Embodiment of this invention. It is a figure for demonstrating the
structure of the unevenness | corrugation which comprises a part of positioning mechanism of
the speaker in connection with the 3rd Embodiment of this invention, (A) is a partial perspective
view of the movable baffle provided with the unevenness | corrugation (B) is a front view of the
unevenness | corrugation seen from the arrow J direction in (A). It is a figure for demonstrating
the structure of the engaging part which comprises a part of positioning mechanism of the
speaker in connection with the 3rd Embodiment of this invention, (A) is a part of the fixed baffle
provided with the engaging part (B) is a perspective view of the plate-like spring which comprises
an engaging part. It is a figure which shows the conventional speaker, (A) is a figure which shows
the external appearance structure, (B) is a figure which shows the schematic cross section. It is a
figure which shows the frequency characteristic of the conventional speaker.
Explanation of sign
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[0062]
10, 10A, 30: Speaker, 11: First equalizer, 12: Baffle, 13, 32: Diaphragm, 13a: Slope part, 14:
Second equalizer, 14 d: facing surface, 16: yoke, 17: magnet, 18: plate, 19: voice coil, 20:
diaphragm ring 34: movable baffle (inner region), 36 ... Fixed baffle (outside area), 40 ...
Irregularities, 40 a ... Concave parts, 41 ... Engaging part
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