close

Вход

Забыли?

вход по аккаунту

?

JP2007174605

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2007174605
An object of the present invention is to improve the strength of a neck portion in the vicinity of a
voice coil fixing portion of a conical diaphragm with a simple structure and to suppress a divided
vibration. SOLUTION: A substantially conical diaphragm 10 having an opening 10A at a
substantially central portion, a voice coil bobbin 6 fixed to the inner periphery of the opening of
the diaphragm 10, a diaphragm 10 and a voice coil bobbin 6 And an annular member 19 for
reinforcing the diaphragm disposed in the vicinity of the fixed portion of The annular member 19
is opposed to the inclined surface 10C in the vicinity of the inner peripheral portion of the
diaphragm 10, and the diaphragm reinforcing portion 191 is formed with the inclined surface
portion 191A fixed to the inclined surface 10C of the diaphragm 10 via the adhesive 31. The
cylindrical portion 192 is integrally formed with the voice coil bobbin 6 and the annular member
19 in which the liquid reservoir 192A to be filled with the adhesive 31 is formed. [Selected
figure] Figure 5
Speaker device
[0001]
The present invention relates to a speaker device.
[0002]
For example, a general speaker device is fixed to a magnetic circuit having a permanent magnet,
a voice coil arranged in a magnetic gap of the magnetic circuit so as to vibrate freely, a voice coil
bobbin on which the voice coil is wound, and a voice coil bobbin And a cone-shaped diaphragm.
12-05-2019
1
When a large sound pressure is generated in the speaker device, a relatively large electric signal
is input to the voice coil through the terminal unit. The voice coil disposed in the magnetic gap
generates an electromagnetic force corresponding to the electrical signal. At this time, a driving
force is applied to the voice coil bobbin via the voice coil, and the cone-shaped diaphragm fixed
to the voice coil bobbin is vibrated. At this time, the driving force largely acts on the fixing
portion between the voice coil bobbin and the cone-shaped diaphragm, and if the strength of the
fixing portion is not sufficient, for example, there is a possibility that adhesion peeling may occur
or the fixing portion may be damaged. In addition, when the strength of the neck portion in the
vicinity of the central portion of the cone-shaped diaphragm is relatively low, unnecessary
divided vibration occurs in the diaphragm, which may deteriorate the sound quality of the
reproduction sound. For this reason, for example, a speaker device is known in which the
strength of the neck portion of the diaphragm is improved. For example, in Patent Document 1,
the strength of the neck portion of the diaphragm is improved by inserting and engaging the
engaging portion formed on the neck portion of the diaphragm into the slit provided on the
circumference of the voice coil bobbin. ing.
[0003]
Unexamined-Japanese-Patent No. 10-210593
[0004]
By the way, in a general speaker device, a notch is formed in the vicinity of the fixed portion of
the voice coil bobbin and the cone-shaped diaphragm, specifically in the neck of the diaphragm,
and the tinsel wire from the voice coil through the notch Is pulling out.
However, if a notch is simply formed in the neck of the diaphragm, the strength of the diaphragm
around the notch may be reduced. In addition, when the notch portion is formed, distortion
occurs in the diaphragm, and the sound quality of the reproduction sound may be degraded. In
addition, when forming the above-mentioned notched portion, the diaphragm is easily damaged,
and in particular, it is technically to process the notched portion etc. on the injection molded PP
(polypropylene resin) diaphragm or the diaphragm using aramid. Have difficulty. In the abovedescribed speaker device, for example, it is technically difficult to form the engaging portion by
processing the neck portion such as a cone-shaped PP diaphragm.
12-05-2019
2
[0005]
The present invention takes an example of the problem to address such a problem. That is, it is
an object of the present invention to improve the strength of the neck portion in the vicinity of
the voice coil fixing portion of the cone-shaped diaphragm with a simple structure, to suppress
the divided vibration and the like.
[0006]
In order to achieve such an object, the present invention at least comprises the configurations
according to the following independent claims. In the invention according to claim 1, a
substantially conical diaphragm having an opening at a substantially central portion, a voice coil
bobbin fixed to the inner periphery of the opening of the diaphragm, the diaphragm, and the
diaphragm And an annular member for reinforcing the diaphragm disposed in the vicinity of a
fixed portion with the voice coil bobbin, wherein the annular member faces an inclined surface in
the vicinity of the inner peripheral portion of the diaphragm, and the inclined surface of the
diaphragm The diaphragm reinforcing part in which the inclined surface part to which it is fixed
via an adhesive is formed, and the cylindrical shape part in which the liquid reservoir part to be
filled with the adhesive is formed between the voice coil bobbin and the annular member are
integrated. It is characterized in that it is molded.
[0007]
A speaker device according to an embodiment of the present invention includes: a substantially
conical diaphragm having an opening at a substantially central portion; a voice coil bobbin fixed
to an inner periphery of the opening of the diaphragm; An annular member for reinforcing a
diaphragm disposed in the vicinity of a fixed portion between the plate and the voice coil bobbin,
wherein the annular member faces an inclined surface in the vicinity of an inner peripheral
portion of the diaphragm; A diaphragm reinforcing portion having a sloped surface portion fixed
to the sloped surface via an adhesive agent, and a cylindrical portion having a liquid reservoir
portion filled with an adhesive between the voice coil bobbin and the annular member And are
integrally molded.
[0008]
In the speaker device having the above configuration, the annular member faces the inclined
12-05-2019
3
surface in the vicinity of the inner peripheral portion of the diaphragm, and the diaphragm
reinforcing portion is formed with the inclined surface portion fixed to the inclined surface of the
diaphragm via an adhesive. And a tubular portion in which a liquid reservoir to be filled with the
adhesive is formed between the voice coil bobbin and the annular member is integrally molded,
so that the diaphragm has a simple structure and a substantially conical shape. The strength of
the portion (corresponding to the neck portion of the diaphragm) in the vicinity of the fixed
portion with the voice coil can be made relatively large compared to the conventional speaker
device.
Further, since the strength in the vicinity of the diaphragm neck portion is relatively large,
unnecessary divided vibration of the diaphragm can be reduced. For example, even in the case of
employing an injection-molded diaphragm, the strength of the neck portion can be improved
with a simple configuration. Hereinafter, a speaker device according to an embodiment of the
present invention will be described with reference to the drawings.
[0009]
FIG. 1 is a cross-sectional view for explaining a speaker device according to an embodiment of
the present invention. FIG. 2 is an enlarged sectional view of the vicinity of the magnetic circuit
of the speaker device shown in FIG. For example, as shown in FIGS. 1 and 2, the speaker device
100 according to the present embodiment is directed radially outward from the center pole 1
standing at a substantially central portion of the speaker device 100 and the base end portion 1A
of the center pole 1. A yoke 4 integrally formed with a bottom yoke 2 which spreads out, an
annular magnet 4 which is a permanent magnet coaxially formed around the center pole 1, and
coaxially formed around the center pole 1; And a top plate 5 that constitutes an outer diameter
side magnetic flux application unit disposed on the upper side. The yoke 3, the magnet 4 and the
center pole 1 form a magnetic circuit 102 that generates a magnetic flux 101. Only the left side
portion of the magnetic flux 101 is shown in FIG. The magnetic circuit 102 forms a magnetic gap
g between the outer peripheral surface 1 a of the center pole 1 and the inner peripheral surface
5 c of the top plate 5. The top plate 5 according to the present embodiment has a first piece 51
and a second piece 52. Moreover, the magnet 4 which concerns on this embodiment has the 1st
magnet 41 and the 2nd magnet 42. As shown in FIG.
[0010]
Further, as shown in FIGS. 1 and 2, in the speaker device 100, the voice coil 7 wound around the
12-05-2019
4
voice coil bobbin 6 is disposed in the magnetic gap g. The voice coil bobbin 6 is supported by the
frame 9 so as to be capable of vibrating along the axial direction (the central axis direction (z-axis
direction) of the center pole 1) by a damper member 8 such as a spider, for example. In the
vicinity of the upper end of the voice coil bobbin 6, a substantially central portion of the
diaphragm 10 is fixed. The outer peripheral edge portion of the diaphragm 10 is connected to
the inner peripheral portion of the frame 9 via the edge 12. In addition, on the side of the
diaphragm 10 of the top plate 5, a heat dissipation member 11 for fixing the top plate 5 and
dissipating the heat of the top plate 5 is disposed.
[0011]
The yoke 3 is disposed at the center of the speaker device 100. The yoke 3 according to the
present embodiment is formed of, for example, a magnetic body such as iron. Further, as
described above, the yoke 3 extends radially outward from the cylindrical center pole 1 standing
at the center of the speaker device 100 and the base end of the center pole 1 opposite to the
diaphragm 10 side. A bottom yoke 2 which is a radially extending portion is integrally formed. A
flat portion 2 a for mounting the magnet 4 is formed on the side surface of the diaphragm of the
outer peripheral portion of the bottom yoke 2. An annular magnet 4 having a rectangular cross
section in the radial direction is mounted on the flat portion 2 a in a concentric axial shape with
the center pole 1. A top plate 5 is also mounted coaxially with the center pole 1 on the
diaphragm side of the magnet 4.
[0012]
The magnet 4 according to the present embodiment has the first magnet 41 and the second
magnet 42 as described above. The first magnet 41 and the second magnet 42 are disposed so as
to overlap so that the directions of the magnetic moments become equal. The first magnet 41
corresponds to an embodiment of a first annular magnet according to the present invention, and
the second magnet 42 corresponds to an embodiment of a second annular magnet according to
the present invention. The inner diameter r411 of the first magnet 41 is larger than the inner
diameter r421 of the second magnet 42. Further, in the present embodiment, the outer diameter
412 of the first magnet 41 and the outer diameter 413 of the second magnet 42 are set to have
substantially the same length. That is, from the distance r1 between the outer peripheral surface
1a of the center pole 1 and the inner peripheral surface 41c of the first magnet 41, the distance
between the outer peripheral surface 1a of the center pole 1 and the inner peripheral side
surface 42c of the second magnet 42 is The distance r2 is long. Further, the length L41 along the
axial direction (z-axis direction in the drawing) of the first magnet 41 according to the present
12-05-2019
5
embodiment is substantially the same length as the length L42 along the axial direction of the
second magnet 42. It is set.
[0013]
The top plate 5 is made of, for example, a magnetic material such as iron. The top plate 5 is a
second magnet directed from the radial cross section rectangular portion 501 provided with the
surface 51 A facing the second magnet 42 to the space between the inner peripheral side surface
42 c of the second magnet 42 and the center pole 1. A cylindrical bent portion 502 which is bent
at a predetermined interval g42 and the inner circumferential side surface 42c of 42 is formed. A
portion (inner circumferential surface 5c) of the bent portion 502 of the top plate 5 facing the
magnetic gap g is formed to have a width L1 longer than the winding width w7 of the voice coil 7
along the central axis c direction. The width L 1 is set to be substantially the same as or larger
than the vibration range of the voice coil bobbin 6. The tip end portion 521 of the bent portion
502 is disposed on the plate side at a specified interval g45 from the vicinity of the corner
portion 41e on the plate side of the inner peripheral edge portion 41d of the first magnet 41.
[0014]
FIG. 3 is a view for explaining the top plate of the speaker device 100 shown in FIGS. 1 and 2.
FIG. 3 (a) is an exploded perspective view of the plate and FIG. 3 (b) is a diagram after the
assembly. It is a perspective view for doing. In the present embodiment, the top plate 5 has a first
piece 51 and a second piece 52 as shown in FIGS. 1 to 3 (a) and (b), and by combining the first
piece 51 and the second piece 52, The top plate 5 of the above shape is formed. Each component
will be described below. The first piece 51 has a large diameter through hole 51B at the center
and is formed in a thin plate ring shape. Further, the first piece 51 is formed with a surface 51 </
b> A that faces the second magnet 42. Further, the first piece 51 is a disk which is formed in a
slender rectangular shape in a radial direction in cross section and which extends in the radial
direction while maintaining a uniform thickness L2 in the axial direction. In detail, the first piece
51 has a cross-sectional shape in which the radial dimension W2 is larger than the axial
dimension L2 in the radial cross-sectional shape. The second piece 52 has an axially extending
cylindrical portion 522 and an engaging portion 523. Specifically, the cylindrical portion 522 has
a large-diameter thin-walled cylindrical shape, is an elongated rectangular cross-sectional shape
in the radial direction, and is a cylinder extending in the axial direction while maintaining a
uniform thickness W1 in the radial direction. As shown in FIG. 2, the second piece 52 has a
magnetic gap facing surface 5f facing the magnetic gap g in the inner circumferential surface 5c,
and in the radial direction cross sectional shape, the axial direction of the magnetic gap facing
12-05-2019
6
surface 5f The dimension L1 has a cross-sectional shape larger than the radial dimension W1.
The engaging portion 523 is bent toward the first piece 51 from the side surface (peripheral
surface) of the cylindrical portion 522, and is formed so as to project over the entire
circumference, as shown in FIGS. 3 (a) and 3 (b). As such, it engages with the first piece 51 at the
time of assembly. A corner 51D, which is a right-angled cross section on the inner peripheral
portion diaphragm 10 side formed by the inner peripheral surface of the through hole 51B of the
first piece 51 and the diaphragm side large area surface 51C, is the engagement of the second
piece 52 An engagement portion on the first piece 51 side engaged with the joint portion 523 is
configured. As shown in FIG. 3 (b), the two engaging portions are engaged with each other and
positioned relative to each other. In the corner portion 51D, the first piece 51 brings the side
open side surface of the inner peripheral portion into close contact (closely in the axial direction)
with the back surface of the engaging portion 523 of the second piece 52. The outer
circumferential surface of the piece 52 is in close contact (in the radial direction). Here, a first
length L3 of the second piece 52 extending to the axial diaphragm side with respect to the first
piece 51 is a second length L4 extending to the opposite side of the diaphragm 10 It is set
shorter than.
[0015]
As shown in FIGS. 1 to 3, in the first piece 51 and the second piece 52 of the present
embodiment, the side open side surface of the inner peripheral portion is in close contact with
the back surface of the engaging portion 523 of the first piece 51. The inner peripheral surface is
in close contact with the outer peripheral surface of the second piece 52 (in the radial direction)
(generally, the two cylindrical members are in close contact in the radial direction. difficult. The
first piece 51 and the second piece 52 may not necessarily be in close contact with each other in
the radial direction. It suffices to be magnetically bonded. It is preferable that the joining surfaces
of the first piece 51 and the second piece 52 be joined with a magnetically sufficiently large
surface so as not to narrow the magnetic path. For this reason, as in the present embodiment,
when the contact surfaces of both the axial contact surface and the radial contact surface are
joined in a close contact state, or when a slight gap is generated between the two, this gap Is
preferably embedded in a magnetic material or the like. Here, “magnetically bonding”
corresponds to a state in which one member is connected to be able to transmit a magnetic flux
to another member, and is directly connected, for example, through a layer of magnetic adhesive.
Also includes non-contacting states.
[0016]
12-05-2019
7
The first piece 51 and the second piece 52 are adhered by an adhesive (not shown) applied
between the outer peripheral surface of the first piece 51 and the inner peripheral surface of the
second piece 51 . The first piece 51 placed directly on the magnet 4 is bonded to the magnet 4
with an adhesive, for example. On the side of the top plate 5 further to the diaphragm 10, a heat
dissipation member 11 having good thermal conductivity and made of a nonmagnetic material
such as aluminum is disposed. The heat dissipating member 11 is preferably a nonmagnetic
material so as not to disturb the magnetic circuit.
[0017]
The heat dissipation member 11 is formed such that a part of the inner side of the frame 9
extends to the open end face of the second piece 5b, and the end face contact portion 11a
formed at the tip contacts the open end face of the second piece 5b. doing. A through hole is
bored in the surface contact portion 11 a in the axial direction, and a screw hole is screwed in the
second piece 52 at a corresponding position, and the heat dissipation member 11 is inserted into
the screw hole The bolt 14 is fastened and fixed to the second piece 52. The heat radiating
member 11 is a heat radiating means for radiating the heat of the top plate 5 and is a fixing
means for fixing the top plate 5 on the magnet 4.
[0018]
Between the outer peripheral surface 1a of the center pole 1 and the inner peripheral surface 5c
of the top plate 5, a magnetic gap g formed at a predetermined distance in the radial direction is
formed over the entire circumference. The magnetic gap g is formed over the outer peripheral
surface of the center pole 1. The magnetic gap g is formed to extend in the axial direction along
the outer peripheral surface of the center pole 1. That is, the magnetic gap g is formed in a
cylindrical shape. In the magnetic gap g, the voice coil 7 is wound around an outer peripheral
surface of a position corresponding to the magnetic gap g of the thin-walled long cylindrical
voice coil bobbin 6. The voice coil bobbin 6 is supported from the frame 9 by a spider 8 which is
a damper member. Thus, the voice coil 7 can vibrate in the axial direction of the center pole 1 in
the magnetic gap g. The other end of the voice coil bobbin 6 is connected to a small diameter end
of a so-called cone-shaped diaphragm 10. The frame 9 has a tapered cylindrical shape, and screw
holes through which bolts pass at equal intervals in the circumferential direction are screwed at
the bottom side edge. A fixing plate for supporting the yoke 3 from the back surface is fixed to
the frame 9 by bolts. Further, as shown in FIG. 1, on the center pole 1, a center piece 15 having
substantially the same diameter as that of the center pole 1 is fixed by bolts 16 inside the voice
coil bobbin 6.
12-05-2019
8
[0019]
For example, when a signal current including a high frequency component is input to the voice
coil 7, an AC magnetic flux is generated when a high frequency component of the signal current,
for example, a high frequency component of about 100 Hz or more is input from the voice coil 7.
The AC magnetic flux is concentrated and distributed on the center pole 1 and the top plate 5 in
the vicinity of the magnetic gap portion G, specifically, in the vicinity of the magnetic gap portion
G. Generally, the material constituting the center pole 1 and the top plate 5 has non-linearity
such as a hysteresis loop (minor loop) as a magnetic property. For this reason, the eddy current
generated by the alternating magnetic flux is affected by the minor loop, distortion occurs in the
current flowing through the voice coil, and the reproduced sound is distorted. In particular, in the
speaker provided with the long plate of the above configuration, the distortion due to the AC
magnetic flux is relatively large. For this reason, as shown in FIG. 3, in the speaker device 100 a
according to the present embodiment, a portion (inner peripheral surface 5 c) of the bent portion
502 of the top plate 5 facing the magnetic gap g and the outer peripheral surface 1 a of the
center pole 1 A short ring made of a nonmagnetic material and a conductor is formed on one or
both of them. In the present embodiment, by providing a short ring made of a nonmagnetic
material in both of them, distortion due to alternating magnetic flux can be reduced.
[0020]
FIG. 4 is a view for explaining an annular member for reinforcement of the speaker device 100
shown in FIG. 4 (a) is a top view of the annular member, and FIG. 4 (b) is a cross-sectional view of
the annular member shown in FIG. 4 (a) along the line A-A. FIG. 5 is an enlarged sectional view of
the vicinity of the annular member of the speaker device 100 shown in FIG. FIG. 6 is an enlarged
cross-sectional view of the vicinity of a groove (notched portion) of the annular member shown in
FIG.
[0021]
The speaker device 100 according to the present embodiment generates a strong driving force
by the magnetic circuit 102 configured as described above. Therefore, by providing an annular
member (holder) 19 for reinforcing the diaphragm at the neck portion of the cone-shaped
(substantially conical) diaphragm 10, the strength in the vicinity of the neck portion of the
12-05-2019
9
diaphragm 10 is improved. In detail, as shown in FIGS. 1 to 6, the speaker device 100 is fixed to
the substantially conical diaphragm 10 having an opening at a substantially central portion, and
the inner periphery of the opening of the diaphragm 10. Voice coil bobbin 6 and an annular
member 19 for diaphragm reinforcement disposed in the vicinity of the fixed portion of
diaphragm 10 and voice coil bobbin 6 (neck portion of diaphragm 10).
[0022]
The annular member 19 has a diaphragm reinforcing portion 191 and a tubular portion 192, as
shown in FIGS. 4 (a) to 4 (c). The diaphragm reinforcing portion 191 and the cylindrical portion
192 are integrally formed of, for example, various materials such as a resin material. In the
diaphragm reinforcing portion 191, the inclined surface portion 191A which faces the inclined
surface 10C in the vicinity of the inner peripheral portion 10B of the opening 10A of the
diaphragm 10 and adheres to the inclined surface 10C of the diaphragm 10 via the adhesive 31
is It is formed. The cylindrical portion 192 is formed in a substantially cylindrical shape, and a
liquid reservoir portion 192A filled with the adhesive 31 is formed between the voice coil bobbin
6 and the annular member 19. The annular member 19 fixed to the diaphragm 10 and the
diaphragm 10 through the diaphragm reinforcing portion 191 is fixed to the voice coil bobbin 6
through the adhesive 31 filled in the liquid storage portion 192A of the cylindrical portion 192. .
[0023]
The diaphragm 10 according to the present embodiment is formed with a bending portion 10D
that bends from the inclined surface 10C of the diaphragm 10 to the inside of the opening 10A.
Then, as shown in FIG. 5, a gap (corresponding to a liquid storage portion 192A) surrounded by
the outer peripheral side surface 6A of the voice coil bobbin 6, the inner side surface of the
cylindrical portion 192, and the outer surface 10E of the bent portion 10D of the diaphragm 10.
) Is filled with an adhesive 31.
[0024]
Further, as shown in FIG. 1 and FIG. 6, the speaker device 100 has, for example, a tinsel cord 21.
One end of the tinsel wire 21 is electrically connected to a terminal 22 disposed on the frame 9,
and the other end is electrically connected to the voice coil 7. As shown in FIGS. 4 and 6, a
groove (notched portion) 193 is formed in the cylindrical portion 192 of the annular member 19.
12-05-2019
10
The tinsel wire 21 is electrically connected to the voice coil 7 in a state of being inserted into the
groove portion 193 as shown in FIG. By providing the groove portion 193 in this manner, the
electrical connection between the tinsel wire 21 and each lead of the voice coil becomes easy. For
example, in the annular member 19, groove portions 193 are formed in a number corresponding
to the number of the tinsel cords 21. In the present embodiment, among the entire circumference
of the annular member 19, the groove portion 193 whose opening angle is set to the prescribed
angle (about 25 degrees) is formed so as to have a positional relationship apart by the prescribed
angle (for example, about 85 degrees). ing.
[0025]
[Method of Manufacturing Speaker Device] FIG. 7 is a flowchart for explaining a method of
manufacturing the speaker device shown in FIG. FIG. 8 is a cross-sectional view showing a
magnetic circuit system of the speaker device shown in FIG. One specific example of a method of
manufacturing a speaker device will be described with reference to the drawings. First, the
magnetic circuit 102 is manufactured, and the magnetic circuit 102 is attached to the frame 9
(step S1). Specifically, as shown in FIG. 8, the magnet 4 is fixed on the bottom yoke 2 of the yoke
3 and the top plate 5 is disposed on the magnet 4. Thus, the magnetic circuit 102 is
manufactured. Next, the magnetic circuit 102 and the frame 9 are fixed.
[0026]
Next, elements of the vibration system according to the present invention are manufactured (step
S2). FIG. 9 is a figure for demonstrating the manufacturing apparatus which manufactures the
cone-shaped diaphragm which concerns on this invention. FIG. 10 is a view for explaining a
conical diaphragm according to the present invention. FIG. 11 is a view for explaining one
specific example of members constituting the diaphragm shown in FIG. For example, as shown in
FIG. 10, the diaphragm 10 according to this embodiment has a structure in which a first
diaphragm layer 10A and a second diaphragm layer 10B are integrally molded by injection
molding. The first diaphragm layer 10A is formed of various materials. For example, as the first
diaphragm layer 10A, it is possible to adopt a member composed of a woven material of aramid
fiber using polyamide fiber, a carbon fiber, a silk mixed fiber, a glass fiber, etc. it can. Further, as
the first diaphragm layer 10A, for example, a woven fabric in which fibers 41 and 42 as shown in
FIG. 11 are woven into biaxial weave (plain weave) may be adopted. The second diaphragm layer
10B is made of a synthetic resin material laminated in close contact with the first diaphragm
layer 10A. In the diaphragm 10 according to the present embodiment, as shown in FIG. 10, a
second diaphragm layer 10B is formed between the first diaphragm layers 10A. At this time, the
12-05-2019
11
materials of the first diaphragm layer 10A on the front side and the first diaphragm layer 10A on
the back side may be different. For example, the first diaphragm layer 10A on the front side may
be formed of a woven fabric member made of aramid or silk mixed fiber, and the first diaphragm
layer 10A on the back side may be formed of a woven fabric member made of glass fiber .
[0027]
For example, as shown in FIG. 9, the mold 311 of the manufacturing apparatus 300 corresponds
to a male mold 313 in which a cone-shaped protrusion 313a is formed along the contour of the
surface of the diaphragm 10, and a cone-shaped protrusion 313a. The female mold 315 is
formed with a cone-shaped recess 315a. In the present embodiment, the male die 313 is held by
the movable platen 312 to operate. Also, the female mold 315 is held by the fixed platen 314 and
operates as the fixed side mold. The clamping pressure between the male mold 313 and the
female mold 315 is controlled by a mold clamping cylinder 308 controlled by a mold clamping
pressure control unit 307. An injection port (gate) 325 for injecting a synthetic resin is
penetratingly formed in a central portion of the female mold 315. For example, an injection port
of an injection device 309 for injecting various injection materials such as a resin mixed agent in
which a foaming agent and an inorganic substance or an organic filler are mixed based on an
olefin resin such as PP (polypropylene) to the injection port 25. Is inserted. The injection device
309 is controlled by the injection conditions controlled by the injection process control unit 310.
Further, information on the injection molding process is output from the injection device 309
side, and the mold clamping pressure control unit 307 clamps the mold according to the
information and information on the distance on the movable platen 312 side, etc. Pressure
control is performed.
[0028]
FIG. 12 is a view for explaining one specific example of the method of manufacturing the
diaphragm by the manufacturing apparatus shown in FIG. One specific example of a
manufacturing method by the manufacturing apparatus 300 of the above configuration will be
described with reference to FIG. With the mold 311 (313, 315) opened as shown in FIG. 12 (a),
the first diaphragm layer 10A is disposed as shown in FIG. 12 (b). Fixation to the respective
molds 313 and 315 is performed, for example, by a specified technique such as a sheet
positioning pin, a sheet pressing means, or vacuum suction. Next, as shown in FIG. 12C, after the
mold is clamped, for example, injection for forming a second diaphragm layer 10B in which a
foaming agent and an inorganic substance or an organic filler are mixed based on an olefin resin
Fill with material 10Ba. At the time of filling of the injection material 10Ba, as shown in FIG. 12
12-05-2019
12
(e), by pressing both molds 313 and 315 slightly, the filled injection material 10Ba is made to
spread evenly all over the cavity. Can be Thereafter, the molds 313 and 315 are opened
appropriately to cause the uncured layer of the filled resin to foam. When the injection foam
forming step is completed, as shown in FIG. 12F, when the molds 313 and 315 are opened, the
second diaphragm layer 10B is formed in the first diaphragm layer 10A of the foamed resin
structure. The diaphragm 10 having a multi-layered structure can be taken out. Although the
diaphragm 10 demonstrated the form which has 3 layer structure of foam structure in
embodiment mentioned above, it is not restricted to this form. For example, the first diaphragm
layer 10A may be formed on only one of the front side and the back side, instead of the foam
structure, which may be a simple injection-molded structure. Also, the diaphragm 10 may have a
simple structure of, for example, a single member. Then, as shown in FIG. 10, the central portion
of the injection-molded product is cut out in a cylindrical shape along the lines A-A and B-B, and
the gate mark by the mold injection port is removed to vibrate the specified shape. Create a
board 10.
[0029]
Next, the annular member 19 is manufactured. The annular member 19 is, for example, one of
the present invention as shown in FIGS. 1, 5 and 6 by filling various molding materials such as a
resin material in a mold in which a cavity having a shape corresponding to the annular member
is formed. The annular member 19 according to the embodiment is manufactured.
[0030]
FIG. 13 is a view for explaining the assembly process of the diaphragm and the annular member.
FIG. 13 (a) is a cross-sectional view for explaining a state before assembly, and FIG. 13 (b) is a
cross-sectional view for explaining a state after assembly. Next, as shown in FIGS. 13A and 13B,
the back surface of the diaphragm 10 and the annular member 19 are disposed, and the inclined
surface 10C near the inner peripheral portion of the diaphragm 10 and the diaphragm of the
annular member 19 are provided. The adhesive 31 is applied between the inclined surface
portions 191 A formed in the reinforcing portion 191 by the adhesive application device 30 to
fix the diaphragm 10 and the annular member 19.
[0031]
12-05-2019
13
FIG. 14 is a view for explaining one specific example of the assembly process of the vibration
system shown in FIG. Fig. 14 (a) is a view showing a state before the diaphragm 10 and the
annular member 19 and the voice coil bobbin 6 are assembled, and Fig. 14 (b) is a view for
explaining an application process of an adhesive. FIG.14 (c) is a figure for demonstrating the
attachment process of a damper member. Next, as shown in FIG. 14, the voice coil bobbin 6 on
which the voice coil 7 is wound, the diaphragm 10 fixed by the adhesive 31, and the annular
member 19 are disposed, and as shown in FIG. The voice coil bobbin 6 is fitted in the opening
1901 of the diaphragm 10 and the annular member 19. Then, as shown in FIG. 14B, the adhesive
31 is filled into the liquid reservoir portion 192A of the annular member 19 by the coating
device 30. At this time, as shown in FIG. 6, the bonding process is performed in a state where the
tinsel wire 21 connected to the voice coil is inserted into the groove (notched portion) 193. At
this time, the adhesive 31 is easily applied to the liquid reservoir 192A by applying the adhesive
31 in a state in which the positional relationship between the diaphragm 10 and the annular
member 19 and the voice coil bobbin 6 shown in FIG. 14 is reversed. It can be filled. Further, by
applying the adhesive 31 from the groove portion 193, the adhesive 31 can be more easily filled
in the liquid reservoir 192A. Next, as shown in FIG. 14C, the damper member 8 is adhered to the
bottom of the annular member 19 with an adhesive 31. After a prescribed time, the adhesive
solidifies, and the diaphragm 10, the annular member 19, the voice coil bobbin 6, and the
damper member 8 are fixed. The vibration system can be made into an element by the above
process.
[0032]
Next, as shown in FIG. 7, the step of attaching the produced vibration system element to the
frame 9 is performed (step S3). The other end of the damper member 8 connected to the voice
coil bobbin 6 is fixed to the frame 9 with an adhesive so that the voice coil 7 is positioned in the
magnetic gap g of the magnetic circuit 102, and the outer periphery of the diaphragm 10 is It
fixes to the outer peripheral part of the flame | frame 9 with an adhesive agent etc. via the edge
12. FIG. The speaker device 100 is manufactured by the above process.
[0033]
As described above, in the speaker device 100 according to the present embodiment, the
substantially conical diaphragm 10 having the opening at the substantially central portion, and
the voice fixed to the inner peripheral portion of the opening of the diaphragm 10 It has a coil
bobbin 6 and an annular member 19 for diaphragm reinforcement disposed in the vicinity of a
fixed portion between the diaphragm 10 and the voice coil bobbin 6. The annular member 19 is
12-05-2019
14
opposed to an inclined surface in the vicinity of the inner peripheral portion of the diaphragm
10, and a diaphragm reinforcing portion 191 is formed with an inclined surface portion adhered
to the inclined surface of the diaphragm 10 via the adhesive 31; Since the cylindrical portion 192
in which the liquid reservoir 192A to be filled with the adhesive 31 is formed is integrally formed
between the voice coil bobbin 6 and the annular member 19, the substantially conical diaphragm
and the voice coil are formed. The strength of the portion (corresponding to the neck portion of
the diaphragm) in the vicinity of the fixed portion can be made relatively large as compared with
the conventional speaker device. Further, since the strength in the vicinity of the diaphragm neck
portion is relatively large, unnecessary divided vibration of the diaphragm can be reduced. In
particular, even when injection-molded diaphragms such as PP (polypropylene resin) diaphragms
or diaphragms with low rigidity are employed, the annular member 19 can be easily provided on
the neck portion of the diaphragm 10. The strength of the neck portion of the diaphragm 10 can
be improved.
[0034]
Further, the annular member 19 fixed to the diaphragm 10 and the diaphragm 10 through the
diaphragm reinforcing portion 191 is fixed to the voice coil bobbin 6 through the adhesive 31
filled in the liquid reservoir portion 192A of the cylindrical portion 192. Therefore, the speaker
device according to the present invention can be easily manufactured by a simple manufacturing
process.
[0035]
Further, the groove portion 193 is formed in the annular member 19, and the tinsel wire 21 is
electrically connected to the voice coil 7 in a state of being inserted into the groove portion 193,
whereby the cutaway portion is formed in the diaphragm 10 as in the prior art. Since it does not
form, the fall of the intensity | strength of a diaphragm can be prevented.
Further, in the conventional speaker device, when the notch portion is formed in the diaphragm,
distortion may occur in the diaphragm and the sound quality of the reproduced sound may be
degraded. However, in the speaker device 100 according to the present invention, the coneshaped diaphragm By forming the annular member 19 in the neck portion 10, since the notch
portion is not formed in the diaphragm 10, it is possible to prevent the deterioration of the sound
quality of the reproduction sound.
[0036]
12-05-2019
15
Further, in the diaphragm 10, a bending portion 10D is formed which is bent from the inclined
surface of the diaphragm 10 toward the inside of the opening, and a gap (a liquid (a liquid
(liquid)) By filling the storage section 192A) with the adhesive 31, the voice coil bobbin 6, the
annular member 19, and the diaphragm 10 can be easily fixed.
[0037]
The present invention is not limited to the embodiment described above.
In the embodiment described above, the diaphragm molded by injection foam molding is
adopted, but the present invention is not limited to this form. For example, a diaphragm made of
a single material may be used, or various diaphragms may be used. Moreover, in the embodiment
described above, the conical diaphragm 10 is adopted, but the present invention is not limited to
this. It may have various shapes such as an elliptical shape or a planar shape. In the embodiment
described above, a gap is formed between the diaphragm reinforcing portion 191 of the annular
member 19 and the diaphragm 10. However, as shown in FIG. 15, for example, there is no gap,
and the diaphragm 10 and the diaphragm The diaphragm reinforcing portion 191 may be
formed in a shape in close contact with the reinforcing portion 191.
[0038]
In the embodiment described above, the neck portion of the diaphragm 10 and the bonding
inclined surface of the diaphragm reinforcing portion 191 of the annular member 19 are formed
in a circular shape, but the present invention is not limited to this. For example, the shape of the
diaphragm reinforcing portion 191 may be formed into various arbitrary shapes in accordance
with the vibration condition of the diaphragm 10. Further, it is preferable to form various
conditions such as the bonding area with the neck portion of the diaphragm 10, the bonding
surface shape and the like according to the material of the diaphragm 10 and the like. By doing
this, it is possible to further reduce distortion in the high-frequency range (around the highfrequency reproduction limit frequency due to the vibration diameter).
[0039]
As described above, the substantially conical diaphragm 10 having the opening 10A at the
12-05-2019
16
substantially central portion, the voice coil bobbin 6 fixed to the inner periphery of the opening
of the diaphragm 10, the diaphragm 10, and the voice The annular member 19 for diaphragm
reinforcement is disposed in the vicinity of the fixed portion with the coil bobbin 6, and the
annular member 19 is opposed to the inclined surface 10 </ b> C in the vicinity of the inner
peripheral portion of the diaphragm 10. A diaphragm reinforcing portion 191 having an inclined
surface portion 191A fixed to the inclined surface 10C via an adhesive 31 is formed, and a liquid
reservoir 192A filled with the adhesive 31 is formed between the voice coil bobbin 6 and the
annular member 19 Since the cylindrical portion 192 to be formed is integrally molded, the
strength (corresponding to the neck portion of the diaphragm) in the vicinity of the fixing portion
between the substantially conical diaphragm and the voice coil is simple with a simple structure.
Ratio compared to the speaker device It is possible to target large. Further, since the strength in
the vicinity of the neck portion of the diaphragm is relatively large, unnecessary divided vibration
of the diaphragm can be reduced. For example, even in the case of employing an injectionmolded diaphragm, the strength of the neck portion can be improved with a simple
configuration.
[0040]
It is a sectional view for explaining a speaker device concerning one embodiment of the present
invention. It is sectional drawing to which magnetic circuit vicinity of the speaker apparatus
shown in FIG. 1 was expanded. It is a figure for demonstrating the top plate of the speaker
apparatus 100 shown in FIG.1, 2 and FIG. 3 (a) is a disassembled perspective view of a plate,
FIG.3 (b) is a perspective view for demonstrating the plate after an assembly. FIG. It is a figure for
demonstrating the annular member for reinforcement of the speaker apparatus 100 shown in
FIG. 4 (a) is a top view of the annular member, and FIG. 4 (b) is a cross-sectional view of the
annular member shown in FIG. 4 (a) along the line A-A. It is sectional drawing to which the
annular member vicinity of the speaker apparatus 100 shown in FIG. 1 was expanded. It is
sectional drawing to which groove part (notched part) vicinity of the annular member shown in
FIG. 5 was expanded. It is a flowchart for demonstrating the manufacturing method of the
speaker apparatus shown in FIG. It is sectional drawing which shows the magnetic circuit system
of the speaker apparatus shown in FIG. It is a figure for demonstrating the manufacturing
apparatus which manufactures the cone-shaped diaphragm which concerns on this invention. It
is a figure for demonstrating the cone-shaped diaphragm which concerns on this invention. It is a
figure for demonstrating one specific example of the member which comprises the diaphragm
shown in FIG. It is a figure for demonstrating one specific example of the manufacturing method
of the diaphragm by the manufacturing apparatus shown in FIG. It is a figure for demonstrating
the assembly process of a diaphragm and an annular member. (A) is sectional drawing for
demonstrating the state before an assembly, (b) is sectional drawing for demonstrating the state
after an assembly. It is a figure for demonstrating one specific example of the assembly process
12-05-2019
17
of a vibration system shown in FIG. (A) is a figure showing the state before assembling the
diaphragm 10 and the annular member 19, and the voice coil bobbin 6, (b) is a figure for
demonstrating the application process of an adhesive agent, (c) is a It is a figure for
demonstrating the attachment process of a damper member. It is a figure for demonstrating the
annular member of the speaker apparatus which concerns on other embodiment of this
invention.
Explanation of sign
[0041]
DESCRIPTION OF SYMBOLS 1 center pole 2 bottom yoke 3 yoke 4 magnet 5 top plate 6 voice
coil bobbin 7 voice coil 8 damper member 9 frame 10 diaphragm 11 heat dissipation member 12
edge 19 annular member 41 first magnet (first annular magnet) 42 second Magnet (second
annular magnet) 51 first piece 51 second piece 100 speaker device 101 magnetic flux 102
magnetic circuit 191 diaphragm reinforcing portion 192 cylindrical portion 193 groove portion
12-05-2019
18
Документ
Категория
Без категории
Просмотров
0
Размер файла
34 Кб
Теги
jp2007174605
1/--страниц
Пожаловаться на содержимое документа