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DESCRIPTION JP2017191971

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DESCRIPTION JP2017191971
Abstract: To provide a speaker unit capable of improving sound quality by a simple configuration
on the back side of a diaphragm. A diaphragm 12, a frame (a housing 31, an arm 32), and a
current plate 40 are provided. The frame supports the outer periphery of the diaphragm. The
rectifying plate is provided on the frame so as to be positioned on the back side of the
diaphragm, and the main surface is disposed in a direction along the amplitude direction of the
diaphragm. [Selected figure] Figure 2
スピーカユニット
[0001]
The present invention relates to a speaker unit.
[0002]
Conventionally, for example, a speaker unit installed to be embedded in an interior material such
as a door of a vehicle is known that is provided with a damping material that absorbs a back
pressure on the back side of a diaphragm of the speaker (for example, patent document 1).
[0003]
WO 2009/144818
[0004]
However, in the above-described prior art, it is necessary to install a damping material separately
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from the speaker, and there is a possibility that the configuration of the entire speaker unit may
be complicated.
[0005]
This invention is made in view of the above, Comprising: It aims at providing the speaker unit
which can improve a sound quality by simple structure.
[0006]
In order to solve the problems described above and to achieve the object, the present invention
comprises a diaphragm, a frame, and a rectifying plate.
The frame supports the diaphragm.
The rectifying plate is provided on the frame so as to be positioned on the back side of the
diaphragm, and the main surface is disposed in a direction along the amplitude direction of the
diaphragm.
[0007]
According to the present invention, it is possible to provide a speaker unit capable of improving
sound quality with a simple configuration.
[0008]
FIG. 1A is a perspective view showing an installation example of the speaker unit according to
the present embodiment.
FIG. 1B is a schematic view showing the attached state of the speaker unit according to the
present embodiment.
FIG. 2 is a perspective view showing the back side of the speaker unit according to the present
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embodiment.
FIG. 3A is a schematic view (No. 1) showing the arrangement of the straightening vanes and the
ridges.
FIG. 3B is a schematic view (No. 2) showing the arrangement of the straightening vanes and the
ridges. FIG. 4 is a schematic view showing the back side of the speaker unit according to the first
modification. FIG. 5 is a schematic view showing the back side of the speaker unit according to
the second modification.
[0009]
Hereinafter, an embodiment of a speaker unit according to the present invention will be
described based on the attached drawings. The present invention is not limited by this
embodiment. Moreover, in FIG. 1A and FIG. 1B, in order to make the explanation intelligible, a
three-dimensional orthogonal coordinate system including a Z axis in which the vertically upward
direction is a positive direction is illustrated. Such an orthogonal coordinate system may also be
shown in other drawings used in the following description.
[0010]
First, an outline of the speaker unit according to the present embodiment will be described with
reference to FIGS. 1A and 1B. FIG. 1A is a perspective view showing an installation example of
the speaker unit according to the present embodiment. FIG. 1B is a schematic view showing the
attached state of the speaker unit according to the present embodiment. In FIG. 1B, the door 101
shown in FIG. 1A is cut along the AA 'line toward the Y-axis positive direction, and the cut door
101 is cut from the X-axis negative direction side shown in FIG. 1A. Corresponds to the
schematic view seen toward the
[0011]
As shown in FIG. 1A, the speaker unit 1 according to the present embodiment is disposed, for
example, in a door 101 of a vehicle 100, and installed in the vehicle 100 such as car navigation
and audio (hereinafter simply referred to as "device"). Play the audio signal from
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[0012]
More specifically, as shown in FIG. 1B, the speaker unit 1 includes a speaker 10, a frame 30, and
a rectifying plate 40.
The speaker unit 1 is attached to the inner panel 101 a of the vehicle 100 such that the sound
output direction, that is, the front side of the diaphragm 12 described later is on the inside of the
vehicle.
[0013]
The speaker 10 includes a vibration unit 11 and a diaphragm 12. The vibrating unit 11 includes
a voice coil, a damper, and the like, and vibrates according to a signal input from the abovedescribed device. The vibrating portion 11 is disposed such that one end thereof is in contact
with the diaphragm 12, and vibrates the diaphragm 12 according to its own vibration. Moreover,
as shown to FIG. 1B, the vibration part 11 is arrange | positioned at the arm part 32 so that the
back side of the diaphragm 12 may be located. In addition, it is a diaphragm 12, a voice coil, a
dust cap, and a damper that vibrate with the vibration part 11.
[0014]
The diaphragm 12 vibrates the surrounding air by vibrating according to the vibration of the
vibrating unit 11, and generates sound toward the inside of the vehicle 100. The amplitude
direction of the diaphragm 12 is a direction along the Y axis shown in FIG. 1B.
[0015]
Further, the diaphragm 12 is a cone-shaped diaphragm in which the outer peripheral portion is
supported by the frame 30 and the central portion side protrudes to the vehicle outer side than
the outer peripheral portion side. The material of the diaphragm 12 is, for example, pulp, but
may be a resin such as polyester or a metal such as aluminum.
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[0016]
The frame 30 includes a housing 31 and an arm 32. The housing unit 31 is a cylindrical housing
that supports the outer peripheral portion of the diaphragm 12 and the front and back sides of
the diaphragm 12 are open ends.
[0017]
The arm portion 32 is, for example, a rod-like member attached from the outer peripheral
portion of the housing portion 31 toward the vibrating portion 11, and supports the vibrating
portion 11 and a flow guide plate 40 described later. The details of the frame 30 will be
described later with reference to FIG.
[0018]
By the way, when the diaphragm 12 vibrates, an air flow (hereinafter, simply referred to as “air
flow”) is generated on the back side of the diaphragm 12, that is, in the space between the
speaker unit 1 and the outer panel 101b. Then, when the air flow is reflected by the outer panel
101b, a vortex is generated in the above-described space.
[0019]
As described above, when a vortex is generated in the space between the speaker unit 1 and the
outer panel 101b, the air flow is disturbed, thereby obstructing the movement of the diaphragm
12, leading to deterioration of the sound quality such as muddy reproduction sound.
[0020]
Therefore, in the speaker unit 1 according to the present embodiment, the rectifying plate 40 is
provided on the back side of the diaphragm 12.
As described above, by providing the rectifying plate 40 on the back side of the diaphragm 12,
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the generation of the above-described vortices can be suppressed, and the sound quality can be
improved. The details will be described below.
[0021]
The straightening vane 40 is, for example, a rectangular plate, and is supported by the arm
portion 32 described above. Further, the main surface of the current plate 40 is disposed in the
direction along the amplitude direction of the diaphragm 12. By arranging the current plate 40 in
such a direction, the space on the back side of the diaphragm 12 can be efficiently divided. And
in the divided space, the degree of freedom of the air flow is restricted, and the generated vortex
is restricted.
[0022]
Therefore, according to the speaker unit 1 provided with such a rectifying plate 40, since the
vortices generated by the air flow are reduced, the sound quality can be improved. Moreover, in
the speaker unit 1 according to the present embodiment, the improvement of the sound quality
only needs to include the rectifying plate 40, so that the sound quality can be improved with a
simple structure.
[0023]
Although FIG. 1B exemplifies the case where the rectifying plate 40 is parallel to the XY plane,
the mounting direction does not matter as long as the main surface of the rectifying plate 40 is
along the Y axis. As described above, according to the speaker unit 1 according to the present
embodiment, the installation environment in which the swirl of the air flow such as the reflection
of the air flow from the rear side is easily generated, such as embedding in the door 101 of the
vehicle 100 Can provide high quality sound.
[0024]
Although FIG. 1B illustrates the case where the rectifying plate 40 is disposed parallel to the
amplitude direction of the diaphragm 12, the invention is not limited thereto. For example, the
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rectifying plate 40 may be inclined within a range of +10 degrees to -10 degrees. Further,
although FIG. 1B illustrates the case where the rectifying plate 40 does not protrude to the back
side of the housing portion 31, the invention is not limited thereto, and the rectifying plate 40
may be disposed to protrude from the housing portion 31. .
[0025]
By the way, in a general vehicle 100, water droplets are introduced between the inner panel
101a and the outer panel 101b from above at the time of car wash or rain. If such water droplets
fall directly on the diaphragm 12, the normal vibration of the diaphragm 12 is impeded, and the
sound quality is degraded. Further, when such water droplets directly fall on the diaphragm 12, a
falling sound of the water droplets is generated, so that the user can hear a sound that can not
normally be heard. That is, the user feels that the abnormal noise occurs from the speaker unit 1.
[0026]
However, depending on the mounting direction, such water droplets may drop directly to the
diaphragm 12 depending on the mounting direction, such as mounting so that the front side of
the speaker unit 1 faces obliquely downward. Such water droplets may also be generated by
condensation.
[0027]
Therefore, in the speaker unit 1 according to the present embodiment, the current plate 40
blocks the water droplets from falling to the diaphragm 12. In other words, the current plate 40
also functions as the waterproof plate of the diaphragm 12.
[0028]
By doing this, such water droplets do not fall on the diaphragm 12, so it is possible to suppress
the deterioration of the sound quality due to the water droplets. This point will be described in
detail with reference to FIG.
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[0029]
Hereinafter, the speaker unit 1 according to the present embodiment will be further described.
First, the structure of the speaker unit 1 according to the present embodiment will be described
with reference to FIG. FIG. 2 is a perspective view showing the back side of the speaker unit 1
according to the present embodiment.
[0030]
As shown in FIG. 2, the speaker unit 1 includes a vibrating portion 11, a vibrating plate 12, a
housing portion 31, an arm portion 32, an attaching portion 35, a rectifying plate 40, and a
flange portion 50. The vibrating unit 11 and the vibrating plate 12 have already been described
with reference to FIG.
[0031]
The housing portion 31 is a cylindrical housing that supports the outer peripheral portion of the
diaphragm 12. In FIG. 2, since the diaphragm 12 is cone-shaped, it illustrates about the case
where the housing | casing part 31 is a cylindrical-shaped housing | casing.
[0032]
The arm unit 32 supports the vibrating unit 11 positioned at the center of the housing unit 31 in
a plan view. Further, the arm portions 32 are, for example, inclined along the shape of the
diaphragm 12 and arranged radially from the vibrating portion 11 toward the outer peripheral
side.
[0033]
The attachment portion 35 includes a protrusion 35 a and an attachment hole 35 b. The
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protruding portion 35 a is disposed on the outer peripheral portion of the housing portion 31 so
as to protrude in the radial direction. The mounting hole 35 b is an opening provided in the
protrusion 35 a. By attaching a mounting member such as a bolt to the mounting hole 35b, the
speaker unit 1 can be mounted on the mounting target (the door 101 shown in FIG. 1A).
[0034]
The rectifying plate 40 is a plate that rectifies the air flow on the back side of the diaphragm 12.
Further, the rectifying plate 40 is provided in the housing portion 31 so as to be located on the
back side of the diaphragm 12, and the main surface is disposed in the direction along the
amplitude direction of the diaphragm 12.
[0035]
In FIG. 2, since the amplitude direction of the diaphragm 12 is the Y-axis direction shown in FIG.
2, the main surface of the rectifying plate 40 is disposed along the Y-axis. Further, at least one
pair of rectifying plates 40 is provided, for example. In addition, in FIG. 2, it has illustrated about
the case where it arrange | positions concentrically from the center of the vibration part 11,
provided with two pairs of flow straightening plates 40. As shown in FIG.
[0036]
Specifically, the straightening vanes 40 forming such a pair have a straight line C along the Z axis
shown in the figure as the symmetry axis. Therefore, in FIG. 2, the current plate 40 a 1 and the
current plate 40 a 2 are a pair, and the current plate 40 b 1 and the current plate 40 b 2 are a
pair. Thus, by providing the current plate 40 as a pair, the left and right regions of the diaphragm
12 are uniformly covered in top view, and the design of the current plate 40 as a waterproof
plate is made as compared with the case where the pair is not provided. It can be simplified.
[0037]
Here, it is preferable that the straightening vanes 40 forming a pair be arranged non-parallel to
each other. This is because when the rectifying plates 40 are arranged in parallel, sound is likely
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to be reflected and resonated between the rectifying plates 40 arranged in parallel. Such
resonance causes the sound quality to deteriorate.
[0038]
Therefore, air flow can be rectified | straightened, suppressing resonance of a sound by arrange |
positioning the baffle plate 40 comrades which make a pair non-parallel. In FIG. 2, as an example
of arrangement | positioning of the baffle plate 40, the case where the lower end side of the main
surface of the baffle plate 40 which makes a pair is arrange | positioned in the attitude | position
which separates from the upper end side is illustrated. By arranging the rectifying plate 40 in
such a direction, it is possible to guide the water droplets dropped to the rectifying plate 40 to
the casing 31 on the outer peripheral side.
[0039]
In addition, it is not restricted to said example, You may make it arrange | position in the attitude
| position in which the upper end side of the main surface of rectification board 40 comrades
which make a pair separates rather than a lower end side.
[0040]
Further, in order to function as a waterproof plate that protects diaphragm 12 from water
droplets falling from above, the upper end of at least the main surface of rectifier plate 40 is
disposed above the center of gravity of diaphragm 12. Is preferred.
[0041]
Further, FIG. 2 exemplifies the case where the straightening vane 40a1 and the straightening
vane 40b1 are substantially parallel and the straightening vane 40a2 and the straightening vane
40b2 are disposed in substantially parallel directions, but the invention is not limited thereto.
The straightening vanes 40 (e.g., the straightening vanes 40a1 and the straightening vanes 40b1)
which are not paired with each other may be arranged in different directions.
[0042]
Further, although FIG. 2 exemplifies the case where each of the rectifying plates 40 is supported
by the casing 31 and the two arm portions 32, the invention is not limited thereto. The outer
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periphery of the portion 31 may be attached so as to be bridged.
Alternatively, the rectifying plate 40 may be supported only by the arm portion 32.
[0043]
By the way, when a plurality of pairs having different distances from the center of the vibrating
portion 11 (the center of gravity of the diaphragm 12) in plan view are provided, the baffles 40
having different distances have the amplitude direction of the diaphragm 12 It is preferable that
the width of the main surface in (hereinafter simply referred to as "width of the main surface") be
different.
[0044]
This is because the optimal width of the main surface differs depending on the position where
the rectifying plate 40 is disposed in order for the rectifying plate 40 to rectify the air flow
efficiently.
Therefore, the air flow can be efficiently rectified by making the widths of the main surfaces of
the flow control plates 40 different from each other as described above different.
[0045]
In the example shown in FIG. 2, the straightening vanes 40 a 1 and 40 a 2 are shaped such that
the width of the main surface is narrower than that of the straightening vanes 40 b 1 and 40 b 2.
The straightening vanes 40a1 and 40a2 and the straightening vanes 40b1 and 40b2 do not
necessarily have to satisfy the above-described relationship, and the width of the optimum main
surface derived by an experiment or the like can be applied.
In such a case, the widths of the main surfaces of the different pairs of rectifying plates 40 may
be equal.
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[0046]
In addition, although the width | variety of the main surface of the baffle plate 40 is illustrated in
FIG. 2 in the case where it is a board narrow on the housing part 31 side, it is not restricted to
this, but the width of the main surface is made uniform. You may make it wide at the housing |
casing part 31 side. In addition, for example, a plate having a shape in which the rectifying plate
40 is curved along the outer periphery of the housing 31 may be used.
[0047]
The frame 30 and the current plate 40 are integrally molded. Thereby, the number of parts of the
speaker unit 1 can be suppressed, and the manufacturing cost can be reduced. From the
viewpoint of reducing the weight of the speaker unit 1, the frame 30 and the rectifying plate 40
are preferably, for example, resin. Alternatively, the frame 30 and the rectifying plate 40 may be
separately manufactured, and the rectifying plate 40 may be fixed to the frame 30 with an
adhesive or the like.
[0048]
The eaves portion 50 is provided at an end portion of the housing portion 31 and plays a
function as a so-called waterproof plate together with the above-described current plate 40,
which blocks water droplets falling from above from falling onto the diaphragm 12. . For this
reason, the flange portion 50 is installed so as to project from the end of the housing portion 31
along the amplitude direction of the diaphragm 12 so as to cover a part of the diaphragm 12 in
top view. In FIG. 2, the case where the collar 50 protrudes along the inner peripheral surface of
the housing 31 is illustrated.
[0049]
By the way, it is known from the result of experiment that the above-mentioned eddies are easily
formed and the sound quality is deteriorated as the area of the weir 50 is larger. Therefore, it is
preferable to reduce the area of the collar 50.
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[0050]
However, in the conventional speaker unit, since the above-described rectifying plate 40 is not
provided, the flange portion 50 needs to function as a waterproof plate for the entire area of the
diaphragm 12. For this reason, in the conventional speaker unit, it is difficult to reduce the area
of the collar portion 50, and the collar portion 50 needs to be provided on the upper half of the
housing portion 31 in the posture shown in FIG.
[0051]
On the other hand, in the speaker unit 1 according to the present embodiment, as described
above, the rectifying plate 40 also functions as a waterproof plate, so that the area of the flange
portion 50 can be made smaller than that of the related art. Thereby, the vortex generated by the
weir 50 can be reduced. The speaker unit 1 may be configured not to include the overhang
portion 50.
[0052]
Moreover, it is preferable that the straightening vane 40 be provided in the vicinity of the brim
portion 50 (for example, the upper half of the housing portion 31). This is because, as described
above, vortices are easily generated in the vicinity of the ridge portion 50. Therefore, by
providing the straightening vane 40 in the vicinity of the ridge portion 50, the generation of a
vortex due to the ridge portion 50 can be efficiently suppressed.
[0053]
Then, the function as a waterproof board of the baffle plate 40 and the collar part 50 is
demonstrated using FIG. 3A and FIG. 3B. FIGS. 3A and 3B are schematic views showing the
arrangement of the straightening vanes 40 and the flanges 50. FIG. In the following, in order to
make the description easy to understand, the current plate 40 and the flange portion 50 are
transmitted through and displayed, and the description of the arm portion 32 and the mounting
portion 35 shown in FIG. 2 is omitted.
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[0054]
Further, FIG. 3A is a top view of the speaker unit 1 in a posture in which an arbitrary angle (for
example, 10 degrees) is inclined counterclockwise in the X axis from the posture of the speaker
unit 1 shown in FIG. FIG. 3B is a schematic view of the speaker unit 1 in a posture in which the
schematic view shown in FIG. 3A is inclined at an arbitrary angle (for example, 20 degrees)
clockwise in the Y-axis toward the positive Y-axis direction. .
[0055]
As shown in FIG. 3A, the current plate 40 and the flange portion 50 are arranged to cover the
entire area of the diaphragm 12 in a top view. Specifically, ridge portion 50 is arranged to cover
region 12 a including straight line C of diaphragm 12, and rectifying plate 40 is the remaining
portion of diaphragm 12 in which a portion of region 12 a is covered by ridge portion 50. Are
arranged to cover the area 12b of the
[0056]
Thus, by disposing the current plate 40 and the ridge portion 50, it is possible to block water
droplets from falling from above onto the diaphragm 12, and the current plate 40 and the ridge
portion 50 can be waterproofed over the entire area of the diaphragm 12. It can function as a
board. As a result, since the water droplets do not fall on the diaphragm 12, deterioration of the
sound quality due to the water droplets can be suppressed.
[0057]
The straightening vane 40 does not include, for example, the area 40F indicated by a broken line
in FIG. 3A. This is because the area 40F does not cover the diaphragm 12 in top view. In other
words, the region 40F does not function as a waterproof plate of the diaphragm 12.
[0058]
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Therefore, the flow straightening plate 40 can be reduced in weight as compared to the case
including the area 40F by making the flow straightening plate 40 not include the area 40F not
functioning as a waterproof plate.
[0059]
Subsequently, the arrangement of the current plate 40 and the flange portion 50 in the case of
being rotated by a predetermined angle around the Y axis from the attitude of the speaker unit 1
shown in FIG. 3A will be described using FIG. 3B.
Also in this case, the current plate 40 and the flange portion 50 are arranged to function as a
waterproof plate of the diaphragm 12.
[0060]
Specifically, as shown in FIG. 3B, the ridge portion 50 is disposed so as to cover the region 12 c
including the straight line C of the diaphragm 12 in a top view, and the rectifying plate 40 is
covered by the ridge portion 50. It is arranged to cover the area 12 d of the diaphragm 12 other
than the area 12 c. In the case of the posture rotated about the Y axis in the opposite direction to
the case shown in FIG. 3B, the area other than the area covered by the ridge portion 50 with the
rectifying plate 40 shown on the back side in FIG. It will be covered.
[0061]
As described above, by arranging the rectifying plate 40 and the flange portion 50, the rectifying
plate 40 and the ridge portion 50 function as a waterproof plate of the diaphragm 12, even when
the speaker unit 1 is attached in different postures. That is, the speaker unit 1 can be attached in
a different posture while maintaining the waterproof function.
[0062]
Note that, as shown in FIG. 2, since the speaker unit 1 is provided with two pairs of rectifying
plates 40, the region covered by the rectifying plates 40 shown in FIGS. 3A and 3B is covered by
two pairs of rectifying plates 40. As a matter of course, the entire area may be covered with a
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pair of current plates.
[0063]
Although FIGS. 3A and 3B illustrate the case where the rectifying plate 40 and the flange portion
50 cover only a partial region of the vibrating portion 11 in top view, the vibrating portion 11 is
illustrated by the rectifying plate 40 and the ridge portion 50. It may be arranged or shaped to
cover the entire area of
[0064]
In such a case, the contamination of the vibrating portion 11 can be suppressed.
Further, as shown in the drawing, when only a partial region of the vibrating portion 11 is
covered, the area of the ridge portion 50 can be made smaller than in the case of covering the
entire region. It can be suppressed.
[0065]
As described above, the speaker unit 1 according to the present embodiment includes the
diaphragm 12, the frame 30, and the rectifying plate 40.
The frame 30 supports the outer peripheral portion of the diaphragm 12. The rectifying plate 40
is provided on the frame 30 so as to be located on the back side of the diaphragm 12, and the
main surface is disposed in a direction along the amplitude direction of the diaphragm 12.
Therefore, according to the speaker unit 1 according to the present embodiment, the sound
quality can be improved with a simple structure.
[0066]
By the way, although the embodiment described above exemplifies the case where the speaker
unit 1 includes the two pairs of rectifying plates 40, the present invention is not limited to this.
Therefore, in the following, as a modification of the speaker unit 1, a case where one pair of
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rectifying plates 40 is provided and a case where three pairs are provided will be described. In
the following description, the number of the rectifying plates 40 provided differs from the
description of the speaker unit 1 described above. For this reason, the description other than the
straightening vane 40 is omitted.
[0067]
First, a first modification in the case where there are a pair of rectifying plates 40 will be
described with reference to FIG. FIG. 4 is a perspective view showing the back side of the speaker
unit 2 according to the first modification. As shown in FIG. 4, the speaker unit 2 according to the
first modification includes a pair of rectifying plates 40 c.
[0068]
The rectifying plate 40c is disposed so as to have the straight line C at the target axis, as in the
speaker unit 1 described above. Further, the width of the main surface of the straightening vanes
40c forming a pair is wider than, for example, the straightening vanes 40a1 and 40a2 and the
straightening vanes 40b1 and 40b2 illustrated in FIG. This is because it is necessary to cover the
diaphragm 12 with a smaller number of current plates 40 than in the case where two pairs of
current plates 40 are provided in top view.
[0069]
Subsequently, a second modification will be described with reference to FIG. FIG. 5 is a
perspective view showing the back of a speaker unit 3 according to a second modification. As
shown in FIG. 5, the speaker unit 3 according to the second modification includes three pairs of
rectifying plates 40 d to 40 f. The current plate 40 forming the pair has the straight line C as the
target axis in the same manner as the speaker unit 1 and the speaker unit 2 described above. The
width of the main surface of the straightening vane 40 becomes wider in the order of, for
example, the straightening vane 40f, the straightening vane 40e, and the straightening vane 40g.
[0070]
As described above, according to the speaker unit 2 and the speaker unit 3 according to the first
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and second modified examples, even when the rectifying plates 40 are one pair or three pairs,
the rectifying plate 40 has a rectifying function and waterproofness of air flow. It has a function.
[0071]
By the way, although the embodiment and the modification which were mentioned above
illustrated about the case where all the speaker units 1-3 have the straightening vane 40 which
makes a pair, it is not restricted to this.
That is, the straightening vanes 40 may not be arranged in pairs, and the straightening vanes to
be paired may have different shapes or the width of the main surface.
[0072]
Alternatively, four or more pairs of rectifying plates 40 may be provided. Further, the direction of
the rectifying plate 40 in the above-described speaker units 1 to 3 is an example, and the
rectifying plate 40 may be arranged radially from the center of the vibrating portion 11.
[0073]
Moreover, in the speaker units 1 to 3 described above, the case where the casing 31 is a
substantially cylindrical casing is exemplified, but it can be arbitrarily changed according to the
outer periphery of the diaphragm 12. Moreover, although the case where all the diaphragms 12
were cone-shaped was illustrated, it is not restricted to this, A planar diaphragm may be
sufficient.
[0074]
Further effects and modifications can be easily derived by those skilled in the art. Thus, the
broader aspects of the invention are not limited to the specific details and representative
embodiments represented and described above. Accordingly, various modifications may be made
without departing from the spirit or scope of the general inventive concept as defined by the
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appended claims and their equivalents.
[0075]
1 to 3 Speaker unit 10 Speaker 11 Vibration unit 12 Vibration plate 30 Frame 31 Frame unit 32
Arm unit 40 Rectifying plate 50 Ridge
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