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JP2011071682

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2011071682
A speaker diaphragm and a speaker capable of providing necessary rigidity while thinning the
central portion of the diaphragm. A diaphragm 22 is for a dynamic type speaker, and a
honeycomb reinforcing rib 26 is formed on the entire surface of a central portion 23 of a
diaphragm made of a flat thin film, and the entire surface of the diaphragm central portion 23 is
formed. Of the central part 23 of the diaphragm uniformly by adjusting the density (fineness) of
the reinforcing rib 26 uniformly, and while thinning the central part 23 of the diaphragm, it is
necessary. Provide rigidity. Such a diaphragm 22 is provided in the speaker 1. [Selected figure]
Figure 1
Speaker diaphragm and speaker
[0001]
The present invention relates to a speaker diaphragm and a speaker used for a small and thin
dynamic type speaker used for a mobile phone or the like.
[0002]
The diaphragm in the small and thin dynamic type speaker used for mobile phones etc. has a
diaphragm edge connecting the center of the diaphragm to the frame, surrounding the entire
periphery of the dome-shaped diaphragm and the center of the diaphragm. In order to obtain
necessary strength (rigidity) at the central portion of the diaphragm, reinforcing ribs are radially
formed (Patent Document 1).
[0003]
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1
JP, 2006-287418, A
[0004]
With the thinning of mobile phones, etc., it is required to make the speaker thinner. However, the
central part of the diaphragm is made thinner, that is, the shape of the central part of the
diaphragm is finally flattened from a dome shape to a flat shape. If the thickness of the
diaphragm is to be reduced, the strength of the central portion of the diaphragm is reduced as it
is flattened, and thus there is a problem that the input resistance of the speaker is reduced.
The radial reinforcing ribs can not uniformly reinforce the entire surface of the central portion of
the diaphragm, and it is difficult to provide the necessary rigidity to the central portion of the
thinned (flattened) diaphragm.
[0005]
An object of the present invention is to provide a speaker diaphragm and a speaker capable of
providing necessary rigidity while thinning the central portion of the diaphragm.
[0006]
The speaker diaphragm of the present invention comprises a magnetic circuit having a yoke, a
magnet and a pole piece, a vibration system having a voice coil and a diaphragm, and a frame for
holding the magnetic circuit and the vibration system A honeycomb reinforcing rib is formed on
the entire surface of a central portion of a diaphragm made of a flat or dome-like thin film, for a
speaker in which a coil is disposed.
[0007]
In the speaker damper of the present invention, it is preferable to appropriately add the following
configurations (a) to (c).
(A) A surface material made of a thin film as a reinforcing material is attached to one side or both
sides of the central portion of the diaphragm.
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(A) The reinforcing rib at the center of the diaphragm is filled with an adhesive as a reinforcing
material.
(C) Bond the two center portions of the diaphragm in the opposite direction.
[0008]
The speaker of the present invention is characterized by including the speaker diaphragm of the
present invention.
[0009]
According to the speaker diaphragm of the present invention, since the honeycomb reinforcing
rib is formed on the entire surface of the central portion of the diaphragm, the entire surface of
the central portion of the diaphragm can be uniformly reinforced, and the density of the
reinforcing rib ( By adjusting the fineness, the strength of the central portion of the diaphragm
can be uniformly adjusted over the entire surface, and the necessary rigidity can be provided
while thinning the central portion of the diaphragm.
Since the honeycomb reinforcing rib is directly formed on the thin film constituting the
diaphragm central portion, reinforcement of the diaphragm central portion can be realized at low
cost.
[0010]
In the speaker diaphragm of the present invention, the rigidity of the central portion of the
diaphragm can be enhanced by appropriately adding the configurations of (A), (B), and (C) alone
or in combination.
[0011]
According to the speaker of the present invention, since the speaker diaphragm of the present
invention is provided, it is possible to secure the input resistance equal to or greater than that of
the prior art while thinning the speaker.
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[0012]
FIG. 1 (a) is a plan view of a speaker diaphragm according to an embodiment of the present
invention, and FIG. 1 (b) is a sectional view taken along the line AA 'of FIG. 1 (a). 1 (c) is a crosssectional view taken along the line BB 'of FIG. 1 (a).
It is a top view of the speaker provided with the diaphragm for speakers shown in FIG.
It is A-A 'sectional drawing of FIG.
It is B-B 'sectional drawing of FIG. It is a disassembled perspective view of FIG. FIG. 6A is a half
sectional view of the speaker diaphragm before deformation, and FIG. 6B is a first modification
example of the modification structure of the speaker diaphragm according to the embodiment of
the present invention. 6C is a half sectional view of the speaker diaphragm as the second
modification, and FIG. 6D is a speaker diaphragm as the third modification. 6 (e) is a half
sectional view of a speaker diaphragm as a fourth modification, and FIG. 6 (f) is a half sectional
view of a speaker diaphragm as a fifth modification. .
[0013]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1
to 5.
[0014]
As shown in FIGS. 2 to 5, the speaker 1 mainly comprises the yoke 11 constituting the magnetic
circuit 10, the magnet 12, the pole piece 13, the voice coil 21 constituting the vibration system
20, and the diaphragm according to the present invention (Diaphragm) 22, an external
connection board 31 provided with a pair of external connection terminals 30 electrically
connected to an external circuit, a baffle 40 covering and protecting the diaphragm 22, a planar
damper 50, a magnetic circuit 10, a vibration system 20 and an external connection board 31
and the damper 50 are assembled to assemble the speaker 1, and the baffle 40 and the frame 40
constitute the housing of the speaker 1.
[0015]
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The frame 60 is formed in a rectangular shape with a shallow bottomed rectangular shape by
raising the outer wall 62 vertically from the outer peripheral edge of the rectangular bottom
plate 61, and the yoke 11 is integrally formed at the central portion thereof.
That is, the oval outer yoke wall 11a is vertically raised from the inner surface of the central
portion of the bottom plate 61, and the central portion of the bottom plate 61 inside the yoke
outer wall 11a is a yoke bottom plate and is shallower than the frame 60 and concentric with the
frame 60. A long bottomed cylindrical yoke 11 is formed.
[0016]
The bottom plate 61 is provided with a step 63 for raising the bottom plate 61 around one half
arc-shaped end of the yoke 11 among the bottom plates 61 around the yoke 11 by one step, and
the longitudinal direction of the frame 60 The raised bottom portion 64 as a lead supporting
portion of the damper 50 is provided at one end (upper end in FIG. 2) (upper end in FIG. 2) and
one end of the frame 60 in the longitudinal direction which is the back side of the raised bottom
64 A recessed portion 65 as an external connection substrate attachment portion is provided on
the outer bottom surface of the connector.
At both end portions of the bottom plate 61 of the raised bottom portion 64, penetrations as a
connection portion between a pair of external connection terminals 30 disposed outside the
frame 60 and two voice coil lead wires 21b disposed inside the frame 60 A hole 66 is provided.
[0017]
When assembling the speaker 1, the bottom plate 61 holds the voice coil 21 at a total of four
places on the central line in the longitudinal direction and at two places on the central line in the
lateral direction (left and right direction in FIG. 2). Through holes 67 and 67 'for inserting four
voice coil positioning pins (not shown) for positioning from the bottom side of frame 60 into the
inside correspond to the insertion positions of the four voice coil positioning pins. It is provided
in a total of four places, two on the center line in the longitudinal direction and two on the center
line in the lateral direction.
[0018]
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Each through hole 67, 67 'functions as a back surface sound hole for releasing the air (sound) in
the frame 60 pushed by the diaphragm 22 to the outside when the speaker 1 is used.
The two through holes 67 on the center line in the longitudinal direction of the frame 60 are
provided in the bottom plate 61 as a yoke bottom plate on the inner side than the yoke outer
wall 11a and mainly release the air pushed by the diaphragm central portion of the diaphragm
22. The two through holes 67 'on the center line in the short direction of the frame 60 are
provided straddling the inner and outer bottom plates 61 of the yoke outer wall 11a, and the
diaphragm edge of the diaphragm 22 as well as the diaphragm edge The air pushed by the part
also escapes.
[0019]
At two places on the center line in the short direction of the yoke outer side wall 11a,
discontinuous portions 11b as voice coil lead wire drawing portions are provided. The two
through holes 67 'on the center line in the short direction of the frame 60 straddle the inner and
outer bottom plates 61 of the yoke outer wall 11a at the two discontinuities 11b.
[0020]
The upper inner surface of the outer side wall 62 is provided with a horizontal step surface 68 as
a support surface of the vibration system 20.
[0021]
The yoke-integrated frame 60 is formed by pressing a single flat metal plate (magnetic material)
and has an axially symmetric structure with the center line in the short direction as the axis of
symmetry.
[0022]
The magnet 12 consists of a long cylindrical permanent magnet.
The pole piece 13 is made of an oval metal flat plate (magnetic material).
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The magnet 12 is adhesively fixed to the inner bottom surface of the yoke 11, and the pole piece
13 is adhesively fixed to the upper surface of the magnet 12, thereby forming an oval-shaped
internal magnetic type magnetic circuit 10. The magnetic circuit 10 forms an oblong magnetic
gap 14 between the top of the yoke outer wall 11 a and the pole piece 13.
[0023]
The voice coil 21 is formed in an elongated cylindrical shape by winding a copper wire or the like
around the outer peripheral surface of an elongated cylindrical voice coil bobbin 21 a made of a
plastic film or the like. Voice coil lead wires 21 b for electrically connecting the voice coil 21 to
the external connection terminal 30 are connected to both ends of the winding, respectively. The
voice coil lead wire 21 b is drawn from two positions on the center line of the voice coil 21 in the
short direction at the lower end portion of the voice coil 21.
[0024]
The diaphragm 22 surrounds the entire periphery of the oval diaphragm central portion 23
covering the upper end opening of the voice coil 21 and the diaphragm central portion 23, and
the diaphragm is formed into a rectangular outer shape in accordance with the outer shape of
the frame 60. It has an edge portion 24. The diaphragm central portion 23 and the diaphragm
edge portion 24 are made of thin films such as plastic films such as polyethylene terephthalate
(PET), polyether imide (PEI) and polyimide (PI).
[0025]
The diaphragm 22 is formed by adhesively fixing the outer peripheral edge of the diaphragm
central portion 23 and the inner peripheral edge of the diaphragm edge 24 after the diaphragm
central portion 23 and the diaphragm edge portion 24 are separately formed. . A rectangular
diaphragm ring 25 as a washer made of metal such as brass is adhesively fixed to the back side
of the outer peripheral edge portion of the diaphragm edge portion 24.
[0026]
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The vibration system 20 bonds and fixes the back side of the boundary portion between the
diaphragm center portion 23 and the diaphragm edge portion 24 of the diaphragm 22 to the
upper end portion of the voice coil bobbin 21a, and the diaphragm center portion 23 of the
diaphragm 22 and the diaphragm edge The voice coil 21 is suspended and fixed on the back side
of the boundary portion of the portion 24 via the voice coil bobbin 21a.
[0027]
The upper end portion of the vibration system 20 is connected to the frame 60 which is the
stationary portion of the speaker 1 by the diaphragm edge portion 24 and held.
That is, the outer peripheral portion of the diaphragm edge portion 24 is adhered and fixed to
the step surface 68 of the outer side wall 62 via the diaphragm ring 25, so that the diaphragm
22 is installed there to cover the upper opening of the frame 60, The voice coil 21 is inserted
into the magnetic gap 14 from above.
[0028]
The external connection substrate 31 is a printed circuit board, and the two external connection
terminals 30 are integrally provided in an insulated state, attached to the recess 65 of the frame
60, and connected to each external connection terminal 30 through each through hole 66. One
end side of the bottom portion 64 is raised and exposed at both ends of the inner bottom surface
of the bottom portion 64. The other end side of each external connection terminal 30 is exposed
substantially flush on the back side of the external connection board 31 and electrically
connected to an external circuit (printed circuit board) on the electronic device side such as a
mobile phone to which the speaker 1 is attached. Be done.
[0029]
The baffle 40 is formed by pressing a flat metal plate, is formed into a square tube shape having
a depth shallower than the frame 60, and is fitted to the upper opening of the frame 60 to cover
and protect the diaphragm 22. The lower end of the outer side wall of the baffle 40 presses and
fixes the outer peripheral edge portion of the diaphragm edge portion 24 and the diaphragm ring
25 from above onto the step surface 68. In the top plate of the baffle 40, a front sound hole 41
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having substantially the same shape as the diaphragm central portion 23 is provided. The outer
sound surface of the baffle 40 and the outer bottom surface of the frame 60 cover the front
sound holes 41 and the rear sound holes (the respective through holes 67, 67 ') there to adjust
the acoustic performance of the speaker 1, or In order to prevent the entry of dust into the
interior, a damping cloth (not shown) having air permeability is attached.
[0030]
The damper 50 is provided in the speaker 1 to hold the vibration system 20 in the correct
position and to play the role of realizing the accurate vibration of the vibration system 20
together with the diaphragm edge portion 24. However, the voice coil lead wire 21b has one
surface. To lead to the external connection terminal 30.
[0031]
The damper 50 is provided with a damper main body 51 that exhibits a damper function, and a
pair of lead portions 52 for guiding the two voice coil lead wires 21 b to the external connection
terminal 30 to be connected.
The damper main body 51 and the lead portion 52 are disposed in one plane. The damper 50 is
formed by punching a single sheet (nonmagnetic material) such as a plastic film of PET, PEI, PI,
etc., and has a planar structure.
[0032]
The damper main body 51 includes an outer ring 51a as a movable part connected to the lower
end of the voice coil bobbin 21a, an inner ring 51b as a fixed part connected to the magnet 12 of
the magnetic circuit 10 as a stationary part of the speaker 1, and an outer ring A flexible portion
51 c connecting the portion 51 a and the inner ring portion 51 b is provided to support the
vibration system 20 with respect to the magnet 12.
[0033]
The outer ring portion 51a is an oval having a constant width over the entire circumference so
that the outer peripheral end surface of the outer ring portion 51a is in contact with the inner
peripheral surface of the voice coil bobbin 21a or one surface of the outer ring portion 51a is in
contact with the lower end surface of the voice coil bobbin 21a. It is formed in a ring.
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[0034]
The inner ring 51b contacts the outer peripheral surface of the magnet 12 with the inner
peripheral end face of the inner ring 51b or is provided on the outer peripheral surface of the
magnet 12 as an upward or downward inner ring adhesive part. In order to bring the surfaces
into contact with each other, it is formed in an oblong ring smaller than the outer ring 51 a and
concentric with the outer ring 51 a with a constant width substantially the same width as the
outer ring 51 a throughout the entire circumference.
The distance between the outer ring portion 51a and the inner ring portion 51b is constant over
the entire circumference.
[0035]
If the step surface 70 is provided directly on the outer peripheral surface of the magnet 12, the
manufacturing cost of the magnet 12 is high, so an elongated cylindrical damper ring 71 made of
plastic (nonmagnetic material) or the like is provided. A stepped surface 70 is provided on the
outer peripheral surface of the magnet 12 by externally fitting the damper ring 71 to the magnet
12.
[0036]
The flexible portion 51c is bent in a crank shape in one plane, and has a plurality of (eight in the
illustrated example) plates which can be bent and deformed with a constant width substantially
the same width as the outer ring portion 51a and the inner ring portion 51b over the entire
length. It consists of a spring-like body, and the middle part of each flexible part 51c is arranged
along the oval center line concentric with those drawn between the outer ring part 51a and the
inner ring part 51b, and outward of each flexible part 51c. One end is connected to the inner
peripheral edge of the outer ring portion 51a, the other inward end of each flexible portion 51c
is connected to the outer peripheral edge of the inner ring portion 51b, and between the outer
ring portion 51a and the inner ring portion 51b by each flexible portion 51c. A plurality of places
(eight places in the illustrated example) mutually offset in the circumferential direction of the
damper main body 51 are connected.
The connection pattern between the outer ring portion 51a and the inner ring portion 51b by the
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flexible portion 51c is shaped such that the damper performance is not unbalanced depending on
the circumferential position of the damper main body 51.
That is, an axially symmetric shape whose center of symmetry is the center line in the
longitudinal direction (vertical direction in FIG. 2) or the center line in the lateral direction
(horizontal direction in FIG. 2) of the damper main body 51; Point (rotational) symmetrical shape
such as a symmetrical shape. In the illustrated example, the damper main body 51 is
axisymmetrical in which both the longitudinal centerline and the lateral centerline of the damper
main body 51 are symmetrical axes, and 180 degrees even when the center of the damper main
body 51 is a symmetry center .
[0037]
Each of the pair of lead portions 52 is formed of a narrow and bendable plate spring-like member
bent in an L shape in one plane, and the broken portion 11b of the yoke outer wall 11a, the yoke
outer wall 11a and the frame 60 The end portions of the raised bottom portion 64 are formed to
extend between the outer side walls 62 of the upper and lower ends.
[0038]
A ring portion for surrounding the through holes 66 provided at both ends of the bottom plate
61 a of the raised bottom portion 64 at the tip of each lead portion 52 and adhesively fixing on
the inner surface of the raised bottom portion 64 around the through holes 66 52a is formed.
[0039]
On one surface (upper surface) of each lead portion 52, a base end portion connected to the
outer ring portion 51a of the lead portion 52 is formed at the tip end portion of the lead portion
52 in order to bond and fix the voice coil lead wire 21b. An adhesive layer (not shown) in the
form of a broken line having a continuous line or one or more cuts is provided up to the inner
hole 52b of the ring 52a.
The adhesive layer is formed, for example, by applying an adhesive.
[0040]
Each lead portion 52 is formed to extend from the damper main body 50 so as to be
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axisymmetric with the longitudinal center line of the damper main body 51 as a symmetry axis,
and the damper 50 as a whole has a central axis of the damper main body 51 as a symmetry axis
as a whole. Has an axially symmetrical structure.
[0041]
The vibration system 20 has its upper end connected to the frame 60 which is the stationary
portion of the speaker 1 by the diaphragm edge portion 24 and is held by the frame 50 which is
the stationary portion of the speaker 1. Connected and held.
That is, the outer peripheral end face of the outer ring 51a is bonded and fixed to the inner
peripheral surface of the voice coil bobbin 21a, or one surface (upper surface) of the outer ring
51a is bonded and fixed to the lower end of the voice coil bobbin 21a. A voice coil bobbin is
formed by bonding and fixing the inner peripheral end face of the portion 51b or bonding and
fixing one surface (upper surface) of the inner ring portion 51b to the upward or downward step
surface 70 provided on the outer peripheral surface of the magnet 12 via the damper ring 71. By
horizontally stretching the damper main body 51 between the lower end portion 21a and the
magnet 12, the damper main body 51 can exhibit the damper function.
[0042]
At this time, the lead portions 52 are extended to both ends of the raised bottom portion 64 via
the discontinuous portion 11 b of the yoke outer wall 11 a, the yoke outer wall 11 a and the
outer wall 62 of the frame 60. The ring portions 52a formed at the tip of each lead portion 52
are adhered and fixed to the inner surface of the raised bottom portion 64 located in the
periphery, whereby each lead portion 52 is centered in the lateral direction at the outer
peripheral edge of the outer ring 51a. The two voice coil lead wires 21b are externally connected
by the respective lead portions 52 by horizontally laying out in the same plane as the damper
main body 51 between the two places on the line and both ends of the raised bottom portion 64.
It leads to the connection terminal 30.
[0043]
That is, two voice coil lead wires 21 b drawn from two places on the center line of the short
direction of the voice coil 21, which are the lower end of the voice coil 21 directly above the base
end of each lead portion 52, By bonding and fixing to an adhesive layer (not shown) provided on
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12
one surface (upper surface) of each lead portion 52, the two voice coil lead wires 21b are bent in
an L shape along each lead portion 52, and the yoke It is led to both ends of the raised bottom
portion 64 via the gap 11 b of the outer wall 11 a, the yoke outer wall 11 a and the outer wall 62
of the frame 60.
Thus, the routing process by forming to the external connection terminal 30 to be connected to
the two voice coil leads 21b is realized not on the air in the speaker 1, but on one surface of the
lead portion 52 provided on the damper main body 51. .
[0044]
When bonding and fixing the voice coil lead wire 21b to the adhesive layer (not shown) of the
lead portion 52, the voice coil lead wire 21b is pulled out from the voice coil 21 in order to allow
and not prevent the vibration of the voice coil 21. Sufficient slack is provided between the end
and the adhesive fixing portion of each lead portion 52 to the adhesive layer (not shown).
[0045]
The two voice coil leads 21b are through holes provided in the inner hole 52b of the ring portion
52a formed at the tip of each lead portion 52 and at both ends of the bottom plate 61a of the
raised bottom portion 64 after drawing processing by forming. It is connected by soldering or
spot welding 80 to one end side of the external connection terminal 30 exposed at both ends of
the inner bottom surface of the raised bottom portion 64 through 66.
[0046]
Each lead portion 52 not only has a function of guiding the two voice coil leads 21 b to the
external connection terminal 30 to be connected when the speaker 1 is assembled, but the tip
portion of the lead portion 52 The ring portion 52a) serves as a fixed portion coupled to the
frame 60 which is the stationary portion of the speaker 1, and the outer ring portion 51a as a
movable portion coupled from the base end to the tip of the lead 52 to the lower end of the voice
coil bobbin 21a. It becomes a flexible part which connects the tip part (ring part 52a) of lead part
52 as a fixed part connected with frame 60 which is a stationary part of speaker 1, and exhibits a
damper function.
That is, the damper main body 51 connects the lower end portion of the vibration system 20 to
the magnet 12 of the magnetic circuit 10 which is the stationary portion of the speaker 1 to
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13
exhibit a damper function, while each lead portion 52 The lower end portion of the frame 60
which is a stationary portion of the speaker 1 exerts a damper function.
The damper performance of the damper 50 is also improved by the lead portions 52.
[0047]
Damper 50 is formed extending from damper main body 51 to external connection terminal 30,
and provided with a lead portion 52 for bonding and fixing voice coil lead wire 21b to one
surface and guiding it to external connection terminal 30, voice coil lead wire 21b Is realized not
on the air in the frame 60 but on one surface of the lead portion 52 provided on the damper
main body 51, that is, by bonding and fixing the voice coil lead wire 21b to one surface of the
lead portion 52. As a result, the process of forming the voice coil lead wire 21b can be performed
easily and properly, and the forming of the voice coil lead wire 21b can be stabilized, and the
voice coil lead wire 21b for the external connection terminal 30 can be The positional accuracy is
also improved, and the productivity of the speaker 1 is improved.
The bending resistance of the voice coil lead wire 21b is also improved, and the input resistance
of the speaker 1 is also improved.
[0048]
The damper main body 51 connects the movable portion 51a coupled to the lower end portion of
the voice coil bobbin 21a, the fixed portion 51b coupled to the stationary portion (the frame 60
and the magnetic circuit 10) of the speaker 1, and connects the movable portion 51a and the
fixed portion 51b. Since the lower end of the vibration system 20 which is provided with the
flexible portion 51c and the distance to the diaphragm edge portion 24 is maximally supported
by the damper main body 51, high damper performance is obtained, and two points of the upper
and lower ends of the vibration system 20 Is supported by the diaphragm edge portion 24 and
the damper main body 51, more stable and accurate vibration of the vibration system 20 can be
obtained, and the input resistance of the speaker 1 can be further improved.
[0049]
The damper main body 51 includes an outer ring portion 51a as a movable portion connected to
the lower end portion of the voice coil bobbin 21a, an inner ring portion 51b as a fixed portion
connected to the magnet 12 of the magnetic circuit 10 as a stationary portion of a speaker, and
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an outer ring portion 51a. A flexible portion 51c is provided to connect between the inner ring
portion 51b and the magnet 12. The flexible portion 51c supports the vibration system 20 with
respect to the magnet 12. A lead portion 52 is formed extending from the outer ring portion 51a.
Since the damper main body 51 can be installed without particularly securing a space by making
effective use, it is possible to further reduce the thickness of the speaker 1 and further improve
the input resistance of the speaker 1.
[0050]
Since the damper main body 51 and the lead portion 52 are disposed in one plane, and the
drawing processing of the voice coil lead wire 21a by forming is realized by bonding and fixing
the voice coil lead wire 21a to one flat surface of the lead portion 52, It becomes possible to
perform the routing process of the voice coil lead wire 21a more easily and properly, and the
productivity of the speaker 1 can be further improved, the speaker 1 can be further thinned, and
the input resistance of the speaker 1 can be further improved. Become.
[0051]
The damper 50 is formed by punching a single sheet and has a planar structure, and the damper
50 capable of improving the productivity of the speaker 1, reducing the thickness of the speaker
1, and improving the input resistance of the speaker 1 is inexpensive. Obtained.
Damper 50 is fixed to an inner ring portion as a movable portion connected to the end of voice
coil bobbin 21a opposite to diaphragm 22 and to a fixed portion connected to outer wall 62 of
frame 60 as a stationary portion of speaker 1. A damper main body for supporting the vibration
system 20 with respect to the frame 60, the flexible portion comprising two voice coil leads It
includes a specific flexible portion that doubles as a pair of lead portions for guiding the wire
21b to the external connection terminal 30 to be connected, and the wire winding process by
forming of the voice coil lead wire 21b is not performed in the air in the frame 60 but in the
damper It may be realized on part of the main body 51, that is, on one surface of the specific
flexible portion.
In this structure, since the damper main body supports the vibration system 20 with respect to
the frame 60, the sensitivity of the speaker 1 can be increased by enlarging the magnet 12 of the
magnetic circuit 10 and strengthening the magnetic circuit 10.
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[0052]
The speaker 1 includes a magnetic circuit 10 having a yoke 11, a magnet 12, and a pole piece
13, a vibration system 20 having a voice coil 21 and a diaphragm 22, and a frame 60 for holding
the magnetic circuit 10 and the vibration system 20. The voice coil 21 is disposed in the
magnetic gap 14 and configured to be dynamic.
[0053]
When current flows from the external circuit to the voice coil 21 from the external circuit
through the external connection terminal 30 and the voice coil lead 21b, the dynamic type
speaker 1 flows to the voice coil 21 and the magnetic flux flowing in the substantially horizontal
direction through the magnetic gap 14 The voice coil 21 vibrates in a piston motion up and down
by the interaction with the current, and the vibration is transmitted to the diaphragm 22 by the
voice coil bobbin 21a, and the diaphragm center portion 23 is vibrated with the diaphragm edge
portion 24 as a fulcrum And make a sound.
That is, it converts electricity into sound.
[0054]
When the diaphragm 22 in the dynamic type speaker 1 flattens the shape of the diaphragm
central portion 23 from the dome shape to a flat shape finally to make the speaker 1 thinner, the
diaphragm central portion 23 is flattened. 1 (a) (b) (c), FIG. 2 to FIG. 4 and FIG. 6 (a), the
diaphragm 22 is deteriorated. Is a flat plastic film for providing necessary rigidity while thinning
(flattening) the central portion 23 of the diaphragm and securing input resistance equal to or
greater than that of the prior art while thinning the speaker 1 A honeycomb-like (honeycomblike) reinforcing rib 26 is formed on the entire surface of the diaphragm central portion 23 made
of a thin film or the like.
[0055]
The figure shows a groove-like reinforcing rib 26 in which the upper surface of the diaphragm
central portion 23 is concave and the lower surface is convex, but the convex reinforcing rib in
which the upper surface of the diaphragm central portion 23 is convex and the lower surface is
concave It may be
[0056]
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As described above, the diaphragm 22 of this embodiment includes the magnetic circuit 10
having the yoke 11, the magnet 12 and the pole piece 13, the vibration system 20 having the
voice coil 21 and the diaphragm 22, and the magnetic circuit 10 and the vibration. A speaker 60
having a frame 60 for holding the system 20 and the external connection terminal 30 and having
the voice coil 21 disposed in the magnetic gap 14 and having a honeycomb shape on the entire
surface of the diaphragm central portion 23 made of a flat thin film. Since the reinforcing rib 26
is formed, the entire surface of the diaphragm central portion 23 can be uniformly reinforced,
and furthermore, by adjusting the density (fineness) of the reinforcing rib 26, the strength of the
diaphragm central portion 23 is entirely equalized. It can be adjusted in the same manner, and
the necessary rigidity can be given while thinning the diaphragm central portion 23.
Since the honeycomb reinforcing rib 26 is directly formed on the thin film constituting the
diaphragm central portion 23, reinforcement of the diaphragm central portion 23 can be realized
at low cost.
[0057]
Further, since the speaker 1 of the present embodiment includes the diaphragm 22 according to
the present embodiment, it is possible to secure the input resistance equal to or greater than that
of the conventional one while thinning the speaker 1.
[0058]
Next, a modified structure of the speaker diaphragm according to the embodiment of the present
invention will be described with reference to FIG.
FIG. 6 is an explanatory view of a modified structure of the speaker diaphragm according to the
embodiment of the present invention, and FIG. 6 (a) shows a half sectional view of the speaker
diaphragm before deformation, and FIG. FIG. 6C is a half sectional view of a speaker diaphragm
as a second modification, and FIG. 6D is a third modification of the speaker diaphragm as a first
modification. 6 (e) is a half sectional view of a speaker diaphragm according to a fourth
modification, and FIG. 6 (f) is a speaker diaphragm according to a fifth modification. It is a half
section view.
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[0059]
As shown in FIG. 6A, in the speaker diaphragm 22 according to one embodiment of the present
invention, the honeycomb reinforcing rib 26 is formed on the entire surface of the diaphragm
central portion 23 formed of a flat thin film. Like the diaphragm 22a of the first modification
shown in FIG. 6 (b), a honeycomb is formed on the entire surface of the central portion 23a of
the diaphragm made of a dome-shaped thin film which is flattened more than before even if it is
not flattened. The reinforcing rib 26 may be formed to have a required rigidity while thinning the
diaphragm central portion 23a while maintaining the dome shape.
[0060]
In the diaphragm 22b of the second modification shown in FIG. 6C, a honeycomb reinforcing rib
26 is formed on the entire surface of the diaphragm central portion 23 formed of a flat thin film.
A surface material 27 made of a thin film such as a metal foil such as aluminum foil as a
reinforcing material or a plastic film such as PET, PEI, PI is attached to one side (the upper
surface in the illustrated example) to further enhance the rigidity of the diaphragm central
portion 23 It is
The surface material 27 is attached to the center of the diaphragm by applying an adhesive on
one side or both sides of the joint surface, forming a heat-sensitive adhesive layer in advance on
one side or both sides of the joint surface, and then using a heat press. This can be done by
affixing the surface material 27 to the diaphragm central portion 23.
Such further reinforcement by the surface material 27 is also applicable to the diaphragm 22a of
the first modified example shown in FIG. 6 (b).
[0061]
In the diaphragm 22c of the third modification shown in FIG. 6D, a honeycomb reinforcing rib 26
is formed on the entire surface of a diaphragm central portion 23 formed of a flat thin film. The
same surface material 27 as the diaphragm 22b of the second modification is attached to both
surfaces (upper surface and lower surface) to further enhance the rigidity of the diaphragm
central portion 23.
[0062]
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In the diaphragm 22 d of the fourth modification shown in FIG. 6E, a honeycomb reinforcing rib
26 is formed on the entire surface of the central portion 23 of the diaphragm made of a flat thin
film. The reinforcing rib 26 is filled with the adhesive 28 as a reinforcing material to further
enhance the rigidity of the diaphragm central portion 23.
For example, an ultraviolet curing adhesive is used for the adhesive 28.
Such reinforcement by the adhesive 28 is also applicable to the diaphragms 22a, 22b and 22c of
the first, second and third modifications shown in FIGS. 6 (b), (c) and (d). .
[0063]
In the diaphragm 22e of the fifth modification shown in FIG. 6F, a honeycomb reinforcing rib 26
is formed on the entire surface of the diaphragm central portion 23 formed of a flat thin film, and
the diaphragm central portion 23 is Two sheets are bonded in the opposite direction, that is, the
upper surfaces (front) or lower surfaces (rear surfaces) of the two diaphragm central portions 23
are laminated to each other (the lower surfaces in the illustrated example) It is an enhanced one.
Bonding of the two diaphragm center parts 23 is performed by applying an adhesive on one side
or both sides of the joint surface, forming a heat-sensitive adhesive layer in advance on one side
or both sides of the joint surface, and heating two sheets This can be done by bonding the
bonding surfaces of the diaphragm central portion 23 of the above. In the diaphragm 22e of the
fifth modification shown in FIG. 6 (f), not only the bonding of the central portion 23 of the two
diaphragms but also one or both surfaces (in the example of FIG. The diaphragm 22f of the 6th
modification which aimed at rigidity improvement of the diaphragm center part 23 is also shown
by affixing the surface material 27 to (7). The reinforcement with the adhesive 28 is also possible
in the diaphragms 22e and 22f of the fifth and sixth modifications.
[0064]
The speaker diaphragm 22 according to one embodiment of the present invention and the
speaker diaphragms 22 and 22a to 22f of the first to sixth modifications are formed separately
from the diaphragm center portions 23 and 23a and the diaphragm edge portion 24. Although
they are formed and integrated, they may be integrally formed from a thin film such as a plastic
film such as a sheet of PET, PEI, PI or the like.
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[0065]
In addition, this embodiment shows one Embodiment of this invention, Comprising: This
invention is not limited to it, A various deformation | transformation implementation can be
carried out in the range which does not deviate from the summary.
[0066]
Reference Signs List 1 speaker 10 magnetic circuit 11 yoke 12 magnet 13 pole piece 14
magnetic gap 20 vibration system 21 voice coil 22, 22a, 22b, 22c, 22d diaphragm 23, 23a
diaphragm central portion 26 reinforcing rib 27 surface material 28 adhesive
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