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JP2006157840

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2006157840
[PROBLEMS] To provide a speaker device capable of preventing generation of an abnormal
sound (squeal) of a cap. A speaker device includes a vibration system including a voice coil
bobbin, a diaphragm, an auxiliary cap, and a cap, and a magnetic circuit system. In the
configuration of the speaker device, the inner peripheral edge portion of the diaphragm is
attached near the upper end portion of the outer peripheral wall of the voice coil bobbin, the
protrusion of the cap is inserted into the opening of the auxiliary cap, and the auxiliary cap is
attached to the cap There is. Each convex portion of the cap is fixed to each concave portion of
the corresponding diaphragm, and the claw portion of the cap is fixed to the projection and the
third flat portion of the diaphragm. The auxiliary cap is disposed at a position covering the upper
surface of the voice coil bobbin, and the outer peripheral edge portion is fixed to the adhesive
near the upper end portion of the outer peripheral wall of the voice coil bobbin. According to this
configuration, when the speaker device is driven, the vibrating area (area) of the cap is reduced,
and an abnormal sound (squeal) from the cap can be prevented. [Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to a mounting structure of a cap and a diaphragm in a speaker
device.
[0002]
2. Description of the Related Art Conventionally, an external magnet type speaker device is
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known that includes a vibration system including a voice coil bobbin, a diaphragm and a cap
having a dustproof function, and a magnetic circuit system having a yoke, a magnet and a plate.
In such a speaker device, for example, a part (attachment surface) of the outer peripheral edge of
the cap is attached near the outer peripheral edge of the diaphragm via an adhesive, and the cap
is a position covering the upper surface of the voice coil bobbin Is located in
[0003]
In addition, the speaker apparatus by which the outer-periphery edge part of the diaphragm
which has an upper side diaphragm, a lower side diaphragm, etc. is attached to an inner edge is
known (for example, refer patent document 1 and 2). There is also known a speaker device in
which an outer peripheral edge portion of a dustproof cap is attached to an outer peripheral edge
side of a diaphragm via an adhesive tape (see, for example, Patent Document 3). Furthermore, a
speaker device in which an opening is formed in a pole piece is known (see, for example, Patent
Document 4).
[0004]
U.S. Patent No. 6,496,590 U.S. Patent No. 6,501,844 U.S. Patent No. 6,639,993 U.S. Patent No.
5,734,734
[0005]
However, in the above speaker device, the attachment surface (adhesion surface) of the cap to
the diaphragm is located on the outer peripheral edge side of the cap, and the adhesion area
between the cap and the diaphragm is small.
For this reason, when the speaker device is driven, the area (area) where the cap vibrates is large,
and there is a problem that an abnormal sound (squeal) is generated from the cap due to the
vibration. As a method of avoiding such a problem, for example, there is a method of making it
difficult to vibrate the cap by thickening the thickness of the cap, thereby preventing the
generation of abnormal noise (squeal). However, adopting such a method causes a new problem
that the weight of the cap is increased by the increased thickness of the cap, and the sensitivity
of the speaker device is reduced.
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2
[0006]
As problems to be solved by the present invention, the above-mentioned ones can be mentioned
as an example. An object of the present invention is to provide a speaker device having an
attachment structure and the like of a cap and a diaphragm, which can prevent generation of an
abnormal sound (squeal) of the cap.
[0007]
The invention according to claim 1 is a speaker device, which is a voice coil bobbin, a diaphragm
attached to the voice coil bobbin, and a cap disposed in front of the diaphragm and at a position
covering the voice coil bobbin. The diaphragm has a first fixed portion in the vicinity of the outer
peripheral portion and a second fixed portion in the vicinity of the central portion, and the outer
peripheral portion of the cap is the outer peripheral portion of the diaphragm or the first The
part of the cap that is coupled to the fixed part and that faces the second fixed part is coupled to
the second fixed part.
[0008]
In one embodiment of the present invention, a speaker device includes a voice coil bobbin, a
diaphragm attached to the voice coil bobbin, and a cap disposed in front of the diaphragm and at
a position covering the voice coil bobbin. The diaphragm has a first fixed portion in the vicinity of
the outer peripheral portion and a second fixed portion in the vicinity of the central portion, and
the outer peripheral portion of the cap is an outer peripheral portion of the diaphragm or the
first fixed portion. The part of the cap that is coupled to the part and that faces the second fixed
part is coupled to the second fixed part.
[0009]
The above-mentioned speaker device is attached to a voice coil bobbin and its voice coil bobbin,
and disposed, for example, in a cone having a diaphragm and a front side of the diaphragm, that
is, on a sound emitting side and a position covering the voice coil bobbin And a cap having a
dustproof function.
[0010]
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In this speaker device, the first fixing portion is provided in the vicinity of the outer peripheral
portion of the diaphragm.
Further, a second fixing portion is provided in the vicinity of the central portion of the
diaphragm.
The outer peripheral portion of the cap is coupled (fixed) to the outer peripheral portion or the
first fixing portion of the diaphragm via, for example, an adhesive element.
In addition, the portion of the cap facing the second fixing portion is coupled to the second fixing
portion, for example, via an adhesive element. That is, the cap is coupled to the diaphragm in a
state of being divided into a portion inside and outside the second fixing portion with the
substantially central portion as a boundary.
[0011]
Therefore, when the voice coil bobbin is driven in the axial direction of the speaker device, the
diaphragm and the cap are also vibrated in the axial direction accordingly. Here, the vibrating
area (area) of the cap is a part inside the second fixing part, and the part outside the second
fixing part hardly vibrates. The reason for this is mainly that the supporting force of the
diaphragm is greater at the portion outside the second fixing portion than at the portion inside
the second fixing portion and it is difficult to vibrate. For this reason, in this speaker device, when
driven, the vibrating area (area) of the cap is small, and it is possible to prevent the abnormal
sound (squeal) from being generated from the cap. In addition, as described above, since the cap
and the diaphragm are coupled at two points of the first fixing portion and the second fixing
portion, it is compared with the case where the cap and the diaphragm are fixed only by their
outer peripheral portions. The bonding area between these elements is increasing. Therefore, the
occurrence of abnormal noise can be prevented without increasing the thickness of the
diaphragm and the cap, and the strength of the diaphragm and the bonding force between the
diaphragm and the cap can be improved. Therefore, the weight of the diaphragm and the cap can
be reduced, and the sensitivity of the speaker device can be improved.
[0012]
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In a preferred embodiment, the first fixing portion has a protrusion on the side facing the cap,
and the outer peripheral portion of the cap has a hook-like claw on the side facing the
diaphragm; The part and the projection can be coupled in contact with each other. Further, the
second fixing portion has a plurality of concave portions on the cap side, and a plurality of
convex portions are formed on a portion of the cap facing the second fixing portion, and the
plurality of convex portions are The plurality of convex portions and the plurality of concave
portions can be coupled in a state of being inserted into the corresponding plurality of concave
portions. Furthermore, in a preferred embodiment, the speaker device further includes an edge
and a frame, the inner periphery of the edge can be attached to the outer periphery of the
diaphragm, and the outer periphery of the edge is attached to the frame Can.
[0013]
In another aspect of the above speaker device, an auxiliary cap is provided between the voice coil
bobbin and the cap, the auxiliary cap is coupled to the cap, and an outer peripheral portion of the
auxiliary cap is the An adhesive element is coupled between the voice coil bobbin and the
diaphragm.
[0014]
According to this aspect, the cup-shaped auxiliary cap is provided between the voice coil bobbin
and the cap, for example.
The auxiliary cap is coupled to the cap. And the outer peripheral part of the auxiliary cap is
couple | bonded with an adhesive element between a voice coil bobbin and a diaphragm. This can
further improve the bonding strength between the cap and the diaphragm.
[0015]
In a preferred example, the auxiliary cap has a contact surface in contact with the cap and has an
opening substantially at the center of the contact surface, and the cap corresponds to the
opening and the auxiliary cap And a protruding portion on the opposite side, and the protruding
portion of the cap is inserted into the opening of the auxiliary cap. This allows the auxiliary cap
to be attached to the proper position of the cap.
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[0016]
In another aspect of the above speaker device, the auxiliary cap has a ventilation means.
[0017]
Here, in the speaker device in which the ventilation means is not provided in the auxiliary cap,
there is a space existing between the auxiliary cap, the voice coil bobbin and the magnetic circuit
as the voice coil bobbin or the like moves to the opposite side to the sound output side. It is
compressed and the pressure in the space is high.
This makes it difficult for the voice coil bobbin and the like to move in that direction, in other
words, mechanical resistance at the time of movement of the voice coil bobbin and the like
increases.
[0018]
In this point, in the above speaker device, the auxiliary cap is provided with the ventilation
means, so even if the voice coil bobbin etc. is moved to the opposite side to the sound output
side, the space is not compressed and the pressure of the space Is not high. Therefore, the voice
coil bobbin or the like can easily move to the side opposite to the sound output side, and the
mechanical resistance at the time of movement of the voice coil bobbin or the like can be
reduced. This can prevent the sound quality from being degraded.
[0019]
In a preferred embodiment, the auxiliary cap has an opening as a ventilation means at a position
in contact with a space existing between the auxiliary cap, the diaphragm and the cap. Further,
the auxiliary cap has an opening as a ventilation means between the contact surface and the
outer peripheral portion.
[0020]
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Moreover, in the speaker device in which the ventilation means is not provided in the auxiliary
cap, the pressure of the space existing between the auxiliary cap, the voice coil bobbin and the
magnetic circuit as the voice coil bobbin etc. moves to the opposite side to the sound emitting
side. Because it becomes high, it is necessary to increase the strength (cohesion) of the elements
of the vibration system of the speaker device. In this respect, in the above-described speaker
device, the air pressure is secured because the air permeability is secured. Therefore, it is not
necessary to positively strengthen the strength (cohesion) of the elements of the vibration
system. That is, in the above-described speaker device, since the ventilation means is provided,
the strength (coupling force) between the elements of the vibration system becomes higher when
the speaker device is driven as compared to the case where the ventilation means is not provided
effect). Also, this makes it possible to operate the vibration system with appropriate softness. As a
result, the vibration system can be accurately controlled, and the speaker device can be easily
brought into a stationary state, that is, the damping effect can be improved.
[0021]
In another aspect of the above speaker device, the portion of the auxiliary cap that contacts the
space existing between the auxiliary cap, the diaphragm, and the cap, a portion of the portion, or
the entire auxiliary cap is breathable. A member having the same, for example, a material such as
a cloth with a large mesh formed. Thereby, the same effect as the case where an opening is
provided in the auxiliary cap as a ventilation means can be obtained, and the mechanical
resistance at the time of movement of the voice coil bobbin etc. can be reduced. Thus, the sound
quality can be prevented from being degraded.
[0022]
In another aspect of the above speaker device, the diaphragm has an opening at a position in
contact with a space existing between the auxiliary cap, the diaphragm and the cap. Thus, the
space existing between the auxiliary cap, the diaphragm and the cap leads to the space existing
between the diaphragm, the edge and the frame through the opening. Further, in another aspect
of the above speaker device, the frame has an opening at a position in contact with a space
existing between the frame, the diaphragm and the edge. Thereby, the space existing between the
frame, the diaphragm and the edge is connected to the external space of the speaker device
through the opening. Therefore, according to these aspects, the pressure in the space existing
between the auxiliary cap, the voice coil bobbin, and the magnetic circuit can be further
prevented from increasing, and the mechanical resistance at the time of movement of the voice
coil bobbin or the like is reduced. can do. Therefore, the sound quality can be further prevented
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from being degraded.
[0023]
Various preferred embodiments of the present invention will be described below with reference
to the drawings.
[0024]
First Embodiment In the first embodiment, by coupling the cap and the diaphragm at a
predetermined position, generation of abnormal noise (squeal) from the cap when the speaker
device is driven is prevented.
[0025]
(Configuration of Speaker Device) FIG. 1 schematically shows a schematic configuration of a
speaker device 100 according to a first embodiment of the present invention.
The speaker device 100 according to the first embodiment is a so-called subwoofer speaker
device.
Therefore, the speaker device 100 can be suitably used as a vehicle-mounted speaker. FIG. 1
shows a cross-sectional view of the speaker device 100 taken along a plane passing through the
central axis. The configuration and the like of the speaker device 100 according to the first
embodiment will be described below with reference to FIGS. 1 to 4.
[0026]
As shown in FIG. 1, the speaker device 100 mainly includes a magnetic circuit system 20 having
a yoke 1, a magnet 2 and a plate 3, a frame 4, a damper 6, a voice coil bobbin 7, a voice coil 8, a
diaphragm 9, an edge 13. A vibration system 30 having an auxiliary cap 11 and a cap 12 and a
plurality of terminal members 5 and mounting members 18 as various other members.
[0027]
First, each component of the magnetic circuit system 20 will be described.
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[0028]
The magnetic circuit system 20 is configured as an external magnet type magnetic circuit.
The yoke 1 has a cylindrical pole portion 1a and a flange portion 1b extending outward from the
outer peripheral wall thereof.
The annular magnet 2 has an annular shape, and is fixed to the upper surface of the flange
portion 1 b which is an element of the yoke 1. The annular plate 3 has an annular shape and is
fixed on the annular magnet 2. In the magnetic circuit system 20, the magnet 2 and the plate 3
constitute a magnetic circuit, and the magnetic flux of the magnet 2 is concentrated in the
magnetic gap 16 formed between the inner peripheral wall of the plate 3 and the outer
peripheral wall of the pole portion 1a. .
[0029]
Next, each component of the vibration system 30 will be described.
[0030]
The various components of the speaker device 100 are fixed to the frame 4 and the frame 4
serves to support those components.
The frame 4 has a first flat portion 4a, a second flat portion 4b, a third flat portion 4c, and the
like, and the upper surface thereof secures flatness. The first flat portion 4 a is formed at a lower
position of the frame 4. The lower surface of the first flat portion 4 a is fixed on the annular
magnet 3. The second flat portion 4 b is formed at a substantially central position of the frame 4.
The outer peripheral edge portion of the damper 6 is attached to the upper surface of the second
flat portion 4 b. The third flat portion 4 c is formed at a position above the frame 4. An outer
peripheral edge portion of a mounting member 18 described later is attached to the upper
surface of the third flat portion 4c.
[0031]
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9
The voice coil bobbin 7 has a substantially cylindrical shape. In the vicinity of the lower end of
the outer peripheral wall of the voice coil bobbin 7, a voice coil 8 described later is wound.
Further, the vicinity of the lower end portion of the outer peripheral wall of the voice coil bobbin
7 is opposed to the respective inner peripheral walls of the annular magnet 2 and the plate 3 at a
constant distance. On the other hand, the vicinity of the lower end portion of the inner peripheral
wall of the voice coil bobbin 7 is opposed to the outer peripheral wall of the pole portion 1 a
which is an element of the yoke 1 at a constant distance. An air gap (magnetic gap 16) is formed
between the outer peripheral wall of the pole portion 1a and the inner peripheral wall of the
plate 3.
[0032]
The voice coil 8 has a pair of plus / minus lead wires (not shown). The lead wire on the positive
side is an input wiring of the L (or R) channel signal, and the lead wire on the negative side is an
input wiring of the ground (GND: ground) signal. Each lead wire is electrically connected to one
end side of each terminal member 5 located on the second flat portion 4 b of the frame 4
through each tinsel wire (not shown). On the other hand, the other end side of each terminal
member 5 is electrically connected to each input wiring on the amplifier side. For this reason, an
electric signal for one channel is input to the voice coil 8 from the amplifier side via each
terminal member 5, each tinsel wire (not shown), each lead wire and the like.
[0033]
The damper 6 has an annular shape, and has an elastic portion in which a corrugated shape is
formed concentrically. The outer peripheral edge of the damper 6 is fixed on the second flat
portion 4 b of the frame 4, while the inner peripheral edge of the damper 6 is fixed to the outer
peripheral wall of the voice coil bobbin 7.
[0034]
Various materials such as paper-based, polymer-based, and metal-based can be applied to the
diaphragm 9 in accordance with various applications. FIG. 2 shows the configuration of the
diaphragm 9 and the like. FIG. 2A shows a plan view of the diaphragm 9 etc. (ie, a plan view of
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the rear side of the diaphragm 9 viewed from the lower side of the drawing) as viewed from the
direction opposite to the arrow Y1 in FIG. FIG.2 (b) shows sectional drawing of the diaphragm 9
grade | etc., Along the cutting plane line A-A 'which passes along the central point O in FIG. 2 (a).
As shown in FIG. 2, the diaphragm 9 has a so-called cone shape, and has a first flat portion 9a, a
second flat portion 9b, a third flat portion 9c, etc. Sex is secured. The first flat portion 9 a is
formed at a substantially central position on the upper surface (front side) of the diaphragm 9.
On the first flat portion 9a, a plurality of concave portions 9ab having a shape similar to a
crescent shape are formed at appropriate intervals along the circumferential direction. The
second flat portion 9 b is formed in the vicinity of the outer peripheral edge portion of the upper
surface of the diaphragm 9, that is, in the vicinity of the third flat portion 9 c. The protrusion 9ba
is formed on the second flat portion 9b along the circumferential direction. The third flat portion
9 c is formed on the outer peripheral edge portion of the upper surface of the diaphragm 9. On
the third flat portion 9c, the inner peripheral edge portion of the attachment member 18 having
a substantially annular shape is attached. The attachment member 18 has a role of stably
attaching the diaphragm 9 and the like to the frame 4. On the upper surface of the inner
peripheral edge portion of the mounting member 18, the inner peripheral edge portion of the
edge 13 having a substantially semicircular shape in a sectional view is attached. On the other
hand, in the vicinity of the outer peripheral edge of the mounting member 18, the outer
peripheral edge of the edge 13 is attached. The inner peripheral edge portion of the diaphragm 9
to which the edge 13 and the attachment member 18 are attached is attached near the upper
end portion of the outer peripheral wall of the voice coil bobbin 7 via the adhesive 10 as shown
in FIG. . In addition, the inner peripheral edge portion of the diaphragm 9 is also fixed to the
inner peripheral edge portion of the damper 6 via the adhesive 10. The lower surface of the
outer peripheral edge portion of the mounting member 18 is fixed on the third flat portion 4c of
the frame 4 as shown in FIG.
[0035]
The auxiliary cap 11 is attached to the lower surface side of the cap 12 and at a position closing
the upper surface of the voice coil bobbin 7. The structure of the auxiliary cap 11 is shown in
FIG. FIG. 3A shows a perspective view of the auxiliary cap 11. FIG.3 (b) shows sectional drawing
when it cut | disconnects in the plane which passes along the central axis of the auxiliary cap 11
in Fig.3 (a). As shown in FIG. 3, the auxiliary cap 11 has a substantially cup-like shape, and has an
upper surface 11a, an outer peripheral edge portion 11b, and the like. An opening 11ab is
formed substantially at the center of the upper surface 11a. A protrusion 12a of a cap 12
described later is inserted into the opening 11ab of the auxiliary cap 11 having such a
configuration as shown in FIG. 1, and the auxiliary cap 11 is attached to the lower surface side of
the cap 12 . Further, the auxiliary cap 11 is disposed at a position closing the upper surface of
the voice coil bobbin 7, and a part of the outer peripheral edge portion of the auxiliary cap 11 is
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in the vicinity of the upper end portion of the outer peripheral wall of the voice coil bobbin 7 via
the adhesive 10. It is fixed to
[0036]
The cap 12 is attached to the diaphragm 9 so as to cover the upper surface of the diaphragm 9
and the like. This has a function of preventing dust and foreign matter from intruding into the
speaker device 100. The structure of the cap 12 is shown in FIG. FIG. 4A shows a plan view of
the cap 11 (that is, a plan view of the back side of the cap 12 viewed from the lower side of the
drawing) as viewed from the direction opposite to the arrow Y1 in FIG. FIG. 4 (b) shows a crosssectional view of the cap 11 along the cutting line B-B 'passing through the center point O in FIG.
4 (a). As shown in FIG. 4, the cap 12 has a substantially disk-like planar shape, and includes a
protrusion 12 a, a plurality of recesses 12 b, a plurality of protrusions 12 c (ribs), and a claw 12
d. The protrusion 12 a protrudes from a substantially central position on the lower surface side
of the cap 12. The protrusion 12 a is inserted into the opening 11 ab of the auxiliary cap 11.
Thus, the projection 12 a has a role of positioning the auxiliary cap 11 at an appropriate position
of the cap 12 or the like. The plurality of recesses 12 b are formed along the circumferential
direction near the outer peripheral edge of the lower surface of the cap 12 and at an appropriate
interval. Each convex portion 12c has a substantially semicircular shape and protrudes from the
lower surface side of each corresponding concave portion 12b. The claw portion 12 d has a hook
shape, and is formed on the outer peripheral edge of the lower surface of the cap 12 and along
the circumferential direction thereof. The attachment structure of the cap 12 to the diaphragm 9
and the like will be described later.
[0037]
In the speaker device 100 described above, the electric signal output from the amplifier side is
output to the voice coil 8 through each terminal portion 5, each tinsel wire (not shown) and each
lead wire. As a result, a driving force is generated in the voice coil 8 in the magnetic gap 16, and
the diaphragm 9 is vibrated in the axial direction of the speaker device 100. Thus, the speaker
device 100 emits a sound wave in the direction of the arrow Y1.
[0038]
(Mounting Structure of Cap and Diaphragm) Next, with reference to FIG. 5, the mounting
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structure of the cap and diaphragm, which is a feature of the present invention, will be described.
FIG. 5 is an enlarged cross-sectional view of a portion of the broken line area E10 in FIG. 1, and
in particular, a cross-sectional view for explaining the attachment structure of the cap 12 and the
diaphragm 9, and the like. In the following, elements that characterize the present invention will
be mainly described.
[0039]
The inner peripheral edge portion of the diaphragm 9 is attached near the upper end portion of
the outer peripheral wall of the voice coil bobbin 7 via the adhesive 10. The protrusion 12 a of
the cap 12 is inserted into the opening 11 ab of the auxiliary cap 11, and the upper surface 11 a
of the auxiliary cap 11 is in contact with a part of the lower surface of the corresponding cap 12.
Thereby, the auxiliary cap 11 is attached to the proper position of the cap 12.
[0040]
The inner peripheral wall of the claw portion 12d of the cap 12 is in contact with the outer
peripheral wall of the protrusion 9ba of the diaphragm 9, and the claw portion 12d has the
protrusion 9ba and the third flat portion via an adhesive (not shown). 9c (hereinafter also
referred to as "first fixing portion"). Each convex portion 12 c of the cap 12 is inserted into each
concave portion 9 ab of the corresponding diaphragm 9, and each convex portion 12 c is
inserted in the concave portion 9 ab via the adhesive 10 (hereinafter referred to as “second
fixing (Also referred to as “part”). Thus, the cap 12 is attached to the diaphragm 9. The outer
peripheral edge portion 11 b of the auxiliary cap 11 is fixed to the adhesive 10 (hereinafter also
referred to as a “third fixing portion”) in a state of being disposed near the upper end of the
voice coil bobbin 7.
[0041]
Next, specific effects and advantages of the present invention compared to the comparative
example will be described. FIG. 6 shows a partial cross-sectional view of the speaker device
according to the comparative example. In the following, the same elements as in the present
invention will be assigned the same reference numerals, and the description thereof will be
simplified.
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[0042]
First, main elements of the speaker device according to the comparative example will be
described. As shown in FIG. 6, the inner peripheral edge portion of the damper 6 is attached to
the outer peripheral wall of the voice coil bobbin 7 via the adhesive 10, while the outer
peripheral edge portion of the damper 6 is a second flat portion 4 b of the frame 4. Mounted on
top. The inner peripheral edge portion of the diaphragm 9 is attached via an adhesive 10 in the
vicinity of the upper end portion of the outer peripheral wall of the voice coil bobbin 7. The inner
peripheral edge portion of the diaphragm 9 and the inner peripheral edge portion of the damper
6 are adhered to each other by an adhesive 10. The cap 20 has a substantially disk-like planar
shape, and has substantially the same size (area) as the cap 12 of the present invention. The
outer peripheral edge portion of the cap 20 is attached to the vicinity of the outer peripheral
edge portion of the diaphragm 9 (the area corresponding to the broken line area E5) via the
adhesive 10 not shown. The inner peripheral edge portion of the mounting member 18 is
mounted on the third flat portion 9 c of the diaphragm 9, while the outer peripheral edge portion
of the mounting member 18 is mounted on the third flat portion 4 c of the frame 4. The inner
peripheral edge of the edge 13 is attached to the inner peripheral edge of the mounting member
18, while the outer peripheral edge of the edge 13 is attached to the outer peripheral edge of the
mounting member 18. Therefore, the inner peripheral edge of the edge 13 is opposed to the
third flat portion 9 c of the diaphragm 9 via the attachment member 18, and the outer peripheral
edge of the edge 13 is for the frame 4 via the attachment member 18. It opposes the 3rd flat part
4c.
[0043]
Next, with reference to FIG. 1, FIG. 5 and FIG. 6, the unique function and effect of the present
invention in comparison with the comparative example will be described.
[0044]
In the comparative example, the cap 20 is fixed to a part of the diaphragm 9 corresponding to
the broken line area E5 via an adhesive (not shown).
Here, when the voice coil bobbin 7 is driven in the arrow Y 2 direction, the cap 20 also vibrates
in the arrow Y 3 direction accordingly. At this time, the vibrating area (area) of the cap 20 is an
area E2 excluding the adhered area. Here, the region E2 substantially corresponds to the area of
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the portion of the cap 20 having the diameter D2. As described above, in the comparative
example, the bonding area between the cap 20 and the diaphragm 9 is small, and the area E2
vibrating with respect to the entire area of the cap 20 (corresponding to the entire area of the
cap 20) is large. Then, the cap 20 generates an abnormal sound (sound). Further, since the
bonding area between the cap 20 and the diaphragm 9 is small, the bonding force between them
is also small.
[0045]
On the other hand, in the present invention, as shown in FIGS. 1 and 5, the cap 12 is, via the
adhesive 10, a second fixing portion corresponding to a substantially central position of the cap
12 and an outer peripheral edge of the cap 12 It is being fixed by the 1st fixed part near the part.
That is, the cap 12 is fixed to the diaphragm 9 in a state of being divided into a portion
corresponding to the region E1 and a portion corresponding to the region E3 with the
substantially central position as a boundary. Here, as shown in FIG. 1, when the voice coil bobbin
7 is driven in the direction of the arrow Y2, the cap 12 also vibrates in the direction of the arrow
Y3 accordingly.
[0046]
At this time, the vibrating area (area) of the cap 12 is the area inside the second fixed part, that
is, the area E1 (<E2), and the area E3 outside the second fixed part hardly vibrates. The reason
for this is that the supporting force of the diaphragm 9 is large and it is difficult to vibrate mainly
in the region E3 outside the second fixing portion as compared with the region E1 inside the
second fixing portion. For this reason, in the speaker device 100, the area (area) where the cap
12 vibrates is small at the time of driving, and it is possible to prevent the abnormal sound
(squeal) from being generated from the cap 12. Further, as described above, since the cap 12 and
the diaphragm 9 are coupled by the first fixing portion and the second fixing portion, as
described above, the coupling area between the elements is increased. Therefore, generation of
abnormal sound from the cap 12 is prevented without thickening the thickness of the diaphragm
9 and the cap 12, and improvement in strength of the diaphragm 9 and improvement in the
coupling force between the diaphragm 9 and the cap 12 are achieved. Can. Therefore, the weight
of the diaphragm 9 and the cap 12 can be reduced, and the sensitivity of the speaker device 100
can be improved.
[0047]
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In addition, in the present invention, the auxiliary cap 11 is further provided, and the outer
peripheral edge portion thereof is fixed to the third fixing portion, so that the bonding strength
between the cap 12 and the diaphragm 9 can be further improved. it can.
[0048]
Second Embodiment In the second embodiment, mechanical resistance at the time of movement
of the vibration system 30 is reduced by providing ventilation means in the elements of the
speaker device 100 described above, for example, the auxiliary cap 11 or the like.
This prevents the sound quality from being degraded.
[0049]
First, the outline of the second embodiment will be described with reference to FIG.
[0050]
In the speaker device 100 of FIG. 1, the space S1 between the diaphragm 9, the edge 13, the
frame 4 and the damper 6, and the space S2 between the diaphragm 9, the cap 12 and the
auxiliary cap 11 are closed. There is.
A space S3 between the voice coil bobbin 7, the auxiliary cap 11, and the pole portion 1a, which
has a substantially cylindrical shape, is in a space S4 between the magnet 2 and the plate 3 and
the yoke 1 via the magnetic gap 16. linked.
[0051]
In the speaker device 100 having such a configuration, assuming that the voice coil bobbin 7 and
the like move in the direction of the arrow Y1, the auxiliary cap 11 and the like move in the
direction of separating from the pole portion 1a. Therefore, part of the air present in the space
S4 flows into the space S3 through the magnetic gap 16, and the volume of the space S3
gradually increases. Thereby, the pressure in space S3 becomes low. On the other hand, in the
12-05-2019
16
speaker device 100, when it is assumed that the voice coil bobbin 7 and the like move in the
direction opposite to the arrow Y1, the auxiliary cap 11 and the like move in the direction
approaching the upper surface of the pole portion 1a. Therefore, part of the air present in the
space S3 is discharged into the space S4 through the magnetic gap 16, and the volume of the
space S3 gradually decreases. That is, in this case, the space S3 is compressed, and the pressure
in the space S3 becomes high.
[0052]
As described above, in the above-described speaker device 100, as the voice coil bobbin 7 and
the like move in the direction of the arrow Y2, the volume of the space S3 increases or vice versa.
In particular, when the voice coil bobbin 7 and the like move in the direction opposite to the
arrow Y1 direction, the pressure in the space S3 becomes high, so the voice coil bobbin 7 and the
like hardly move in the direction opposite to the arrow Y1. That is, in this case, mechanical
resistance at the time of movement of the voice coil bobbin 7 and the like increases. Therefore,
depending on the degree of mechanical resistance at the time of movement of the voice coil
bobbin 7 etc., it is difficult to vibrate the diaphragm 9 etc. properly, and the sound quality may be
degraded.
[0053]
Therefore, in order to avoid the occurrence of such a defect, it is necessary to reduce mechanical
resistance at the time of movement of the voice coil bobbin 7 or the like by some method.
[0054]
Therefore, in order to achieve such an object, the auxiliary cap 11 is provided with a ventilation
means so that air can freely flow at least between the space S2 and the space S3.
By adopting such a configuration, if it is assumed in FIG. 1 that the voice coil bobbin 7 etc. has
moved in the direction opposite to the arrow Y1 direction, as described above, part of the air
present in the space S3 At the same time, part of the air present in the space S2 flows into the
space S3 through the ventilating means provided on the auxiliary cap 11. Therefore, in this case,
the pressure in the space S3 can be lowered as compared with the case in which the auxiliary cap
11 is not provided with the ventilation means, and the voice coil bobbin 7 and the like easily
move in the opposite direction to the arrow Y1 direction. That is, in this case, mechanical
12-05-2019
17
resistance at the time of movement of the voice coil bobbin 7 and the like can be reduced.
[0055]
Based on the above-described examination results, as a specific means, in the second
embodiment, ventilation means, specifically, a plurality of openings are provided at
predetermined positions of the auxiliary cap 11. Further, in the second embodiment, in order to
further reduce the mechanical resistance at the time of movement of the voice coil bobbin 7 etc.,
the diaphragm 9 and the frame 4 are also provided with a plurality of openings functioning as
ventilation means.
[0056]
FIG. 8 shows the configuration of the auxiliary cap 11 provided with a plurality of openings
functioning as ventilation means. 8 (a) shows a perspective view of the auxiliary cap 11 provided
with a plurality of openings, and FIG. 8 (b) is cut in a plane passing through the central axis of
the auxiliary cap 11 in FIG. 8 (a) Shows a cross-sectional view when the The auxiliary cap 11
shown in FIG. 8 has the same configuration as the auxiliary cap 11 shown in FIG. 3 except that a
plurality of openings are provided. Further, FIG. 9 shows a configuration of the diaphragm 9
provided with a plurality of openings functioning as a ventilation means. FIG. 9 (a) shows a plan
view of the diaphragm 9 provided with a plurality of openings, and FIG. 9 (b) is a cutting line AA
'passing through the center O in FIG. 9 (a). Figure 2 shows a cross-sectional view along. The
diaphragm 9 shown in FIG. 9 has the same configuration as the diaphragm 9 shown in FIG. 2
except that a plurality of openings are provided. Further, FIG. 10 shows a frame 4 provided with
a plurality of openings functioning as ventilation means. FIG. 10 is a cross-sectional view
substantially corresponding to FIG. 5, and in FIG. 10, the pole portion 1a is also illustrated for
convenience of explanation. In FIG. 10, only one opening is shown for the sake of illustration.
[0057]
First, as shown in FIG. 8, the auxiliary cap 11 has a side wall 11c between the upper surface 11a
and the outer peripheral edge 11b. The upper surface 11a, the outer peripheral edge portion
11b, and the side wall 11c are integrally formed. The side wall 11c is formed with a plurality of
openings 11ca along the circumferential direction and at appropriate intervals. The plurality of
openings 11 ca function as the ventilating means described above.
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[0058]
Next, as shown in FIG. 9, the diaphragm 9 has a side wall 9d between the first flat portion 9a and
the inner peripheral edge portion. A plurality of openings 9da are formed in the side wall 9d
along the circumferential direction and at appropriate intervals. Next, the frame 4 has a plurality
of openings 4da as shown in FIG. The plurality of openings 4da are formed in the side wall 4d
located between the second flat portion 4b and the third flat portion 4c. In addition, the plurality
of openings 4da are formed along the circumferential direction of the side wall 4d and at
appropriate intervals.
[0059]
A state in which the auxiliary cap 11 having the ventilation means described above, the
diaphragm 9 and the frame 4 are attached to the speaker device 100 is shown in FIG.
[0060]
In FIG. 10, the plurality of openings 11ca of the auxiliary cap 11 is a space S2 existing between
the diaphragm 9, the side wall 11c of the auxiliary cap 11, and the cap 12, and the inner
peripheral wall and pole of the auxiliary cap 11 and the voice coil bobbin 7. The space S2 and the
space S3 are connected to each other through the plurality of openings 11ca.
The plurality of openings 9da of the diaphragm 9 are in contact with the space S2 and the space
S1 existing between the diaphragm 9 and the edge 13 and the side wall 4d of the frame 4 and
the damper 6, respectively. S1 is connected through a plurality of openings 9da. Furthermore,
the plurality of openings 4da of the frame 4 are respectively in contact with the space S1 and the
external space of the speaker device 100, and the space S1 and the external space are connected
through the plurality of openings 4da. Therefore, in the second embodiment, the space S4 (see
FIG. 1), the space S3, the space S2, the space S1, and the external space are connected through
the above-described openings.
[0061]
In the second embodiment having the above-described configuration, when the speaker device
100 is driven, the voice coil bobbin 7 and the like move in the arrow Y1 direction and the arrow
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Y5 direction opposite to the arrow Y1 direction.
[0062]
Here, assuming that the voice coil bobbin 7 or the like has moved in the direction of the arrow
Y1, as understood with reference to FIGS. 1 and 10, part of the air present in the space S4 flows
into the space S3. At the same time, a part of the air present in the space S3 is discharged to the
space S2 through the plurality of openings 11ca of the auxiliary cap 11 as shown in the direction
of the arrow Y7.
Further, in connection with this, a part of the air existing in the space S2 is discharged to the
space S1 through the plurality of openings 9da of the diaphragm 9 as shown in the arrow Y7
direction by the amount flowing into the space S2. A portion of the air present in the space S1 is
discharged to the external space through the plurality of openings 4da of the frame 4 as shown
in the arrow Y7 direction as much as flowing into the space S1.
[0063]
On the other hand, assuming that the voice coil bobbin 7 or the like has moved in the direction of
arrow Y5, as is understood with reference to FIGS. 1 and 10, part of the air present in space S3 is
discharged to space S4. . Along with this, a part of the air present in the space S2 flows into the
space S3 through the plurality of openings 11ca of the auxiliary cap 11 as shown in the arrow Y8
direction by the amount discharged from the space S3. Further, in conjunction with this, a part of
the air present in the space S1 is discharged into the space S2 through the plurality of openings
9da of the diaphragm 9 as indicated by the arrow Y8 by the amount discharged from the space
S2. A part of the air present in the external space flows into the space S1 through the plurality of
openings 4da of the frame 4 as it flows in and is discharged from the space S1.
[0064]
As described above, in the speaker device 100 in which the ventilation means is not provided,
when the voice coil bobbin 7 or the like moves in the arrow Y5 direction opposite to the arrow
Y1 direction, the pressure in the space S3 increases and the voice coil bobbin 7 or the like moves
It becomes difficult, that is, mechanical resistance at the time of movement of the voice coil
bobbin 7 increases.
12-05-2019
20
[0065]
In this respect, in the second embodiment, since the auxiliary cap 11, the diaphragm 9 and the
frame 4 are provided with a plurality of openings, the air permeability is good.
Therefore, in the speaker device 100 of the second embodiment, even when the voice coil bobbin
7 or the like moves in the direction of the arrow Y5 in particular, the pressure in the space S3 is
not increased by the above-described operation. Therefore, in this case, the voice coil bobbin 7
and the like easily move in the direction of the arrow Y5, and mechanical resistance at the time
of movement of the voice coil bobbin 7 and the like can be reduced. This can prevent the sound
quality from being degraded.
[0066]
In the speaker device 100, when the pressure in the space S3 is increased as described above, an
external force corresponding to the pressure acts on each element of the vibration system 30.
Therefore, in this case, it is necessary to increase the strength (coupling force) between the
elements of the vibration system 30. In this respect, in the second embodiment, since the air
permeability is secured, the pressure in the space S3 does not increase as described above.
Therefore, the strength (coupling force) between the elements of the vibration system 30 may
not be positively increased. That is, since the venting means is provided in the second
embodiment, the strength (coupling force) between the elements of the vibration system 30 is
increased when the speaker device 100 is driven, as compared with the case where the venting
means is not provided ( Reinforcement effect). Moreover, thereby, the vibration system 30 can be
operated by moderate softness. As a result, the vibration system 30 can be accurately controlled,
and the speaker device 100 can be easily brought into a stationary state, that is, the damping
effect can be improved.
[0067]
[Modifications] In the present invention, the attachment structure (coupling method) at the outer
peripheral edge of the cap 12 and the diaphragm 9 is not limited to the above-described
structure, and various other methods can be adopted. FIG. 7 shows an example of the combining
method. FIG. 7 is a partial cross-sectional view corresponding to broken line area E11 in FIG.
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21
[0068]
As shown in FIG. 7, in this example, the method of coupling the outer peripheral edge portion of
the cap 12 and the diaphragm 9 is different from that of the above embodiment. That is, in this
example, as shown by the broken line area E12 in FIG. 7, the second flat portion 9b and the
protrusion 9ba are not provided in the vicinity of the outer peripheral edge of the diaphragm 9,
and instead, in the broken line area E12. The corresponding portion of the diaphragm 9 is in
contact with the outer peripheral edge of the cap 12. Then, in this example, the outer peripheral
edge portion of the cap 12 and the diaphragm 9 at the corresponding position are fixed by an
adhesive (not shown). The effects of the present invention can also be obtained by this structure.
[0069]
Further, in the second embodiment described above, the side wall 11c of the auxiliary cap 11 is
provided with a plurality of openings 11ca as ventilation means. The present invention is not
limited to this, and in the present invention, a portion having air permeability, for example, a
large mesh, is a portion corresponding to the plurality of openings 11 ca of the side wall 11 c of
the auxiliary cap 11 or the whole side wall 11 c You may comprise with materials, such as the
formed cloth. As a result, since the member having air permeability functions as the ventilation
means, it is possible to obtain the same effect as that of the second embodiment.
[0070]
The cross section diagram of the speaker device which relates to the 1st example of this
invention is shown. The top view and sectional drawing of a diaphragm concerning a 1st example
are shown. The perspective view and sectional drawing of an auxiliary cap concerning a 1st
example are shown. The top view and sectional drawing of a cap concerning a 1st example are
shown. It is a fragmentary sectional view showing the attachment structure of the cap and
diaphragm concerning a 1st example. It is a fragmentary sectional view showing the attachment
structure of the cap and diaphragm concerning a comparative example. It is a fragmentary
sectional view showing an example of the attachment structure of the cap and diaphragm
concerning a modification. The perspective view and sectional drawing of an auxiliary cap
concerning a 2nd example of the present invention are shown. The top view and sectional
drawing of a diaphragm concerning a 2nd example are shown. It is a fragmentary sectional view
12-05-2019
22
of the speaker apparatus explaining the effect of the ventilation | gas_flowing means of 2nd
Example.
Explanation of sign
[0071]
7 voice coil bobbin 9 diaphragm 9da, 11ca, 4da opening 11 auxiliary cap 12 cap 9ab recessed
portion 9ba, 12a protruding portion 12c protruding portion 12c protruding portion 12d claw
portion 20 magnetic circuit system 30 vibration system S1, S2, S3, S4 space 100 speaker device
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