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JP2012070147

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DESCRIPTION JP2012070147
PROBLEM TO BE SOLVED: To provide a speaker vibration system having a double diaphragm
structure in which a first diaphragm, a second diaphragm, and a bobbin of a voice coil are
connected, which has high rigidity and reproduced sound quality with few peak dips in sound
pressure frequency characteristics. Provide an excellent speaker. A speaker includes a first
diaphragm, a second diaphragm disposed on the back side of the first diaphragm and coupled
with the outer peripheral side of the first diaphragm on the outer peripheral side thereof, and a
bobbin having a substantially cylindrical shape. And the first diaphragm is extended so as to be
folded back from the outer peripheral end of the substantially cone-shaped base, defining a
convex ridge on the front side and on the rear side of the ridge. A base including an inner
peripheral part connected to the bobbin and having an engagement collar defining an
engagement recess, and a radially outer end of the base extending radially outward from the
inner peripheral part of the base And an edged portion for defining a plurality of through holes
in the base at a position between the inner peripheral portion and the engaging portion. [Selected
figure] Figure 1
スピーカー
[0001]
The present invention relates to a speaker that uses a diaphragm that is lightweight, has high
rigidity, and has a wide piston vibration zone, and in particular, a first diaphragm disposed on the
front side that emits sound waves, and a speaker that is disposed on the back side of the first
diaphragm. A speaker having a speaker vibrating system of a double diaphragm structure
including a second vibrating plate and a bobbin of a voice coil connected to the first vibrating
plate and the second vibrating plate.
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1
[0002]
In the speaker, an assembly structure in which an inner peripheral end of a speaker diaphragm
(in particular, a cone type diaphragm) is adhered with an adhesive to a cylindrical side surface of
a cylindrical voice coil bobbin is often used.
Some conventional speakers attempt to reduce the number of assembly steps by devising this
assembly structure. In addition, in a speaker provided with a cone-shaped diaphragm or a domeshaped diaphragm, a double vibration that improves the strength of the speaker vibration system
by providing a cone-shaped diaphragm behind the diaphragm exposed to the front side. Board
structure may be adopted.
[0003]
Conventionally, for example, in a speaker in which a central portion of a diaphragm is coupled to
a voice coil embedded in a magnetic gap of a magnetic circuit, the diaphragm has two or more
sheets in which one of a half apex angle and a curvature is different. There is a speaker
characterized in that it is configured using a cone of U.S. Pat. Moreover, as a speaker of the
double diaphragm structure according to the applicant of the present invention, the respective
outer peripheral portions of two cone-shaped diaphragm base materials having different half
apex angles are adhered to each other, and the inner periphery of a common edge member The
respective inner peripheral portions of the diaphragm base are connected to the common voice
coil bobbin with a gap therebetween, and the core material is inserted in the gap between the
two diaphragm bases. There is a speaker characterized in that a diaphragm having a filled
structure is held by a frame through the edge (Patent Document 2).
[0004]
Further, in the inverted dome type speaker in which the shape of the diaphragm is a front
longitudinal cross section and the curved surface protrudes downward in a dome shape, the
diaphragm 1 is formed by injection molding mainly made of thermoplastic resin and concentric
on the back surface of the diaphragm 1 A plurality of ring-shaped ribs 15a, 15b, 15c, 15d are
provided, and the voice coil bobbin 2 is fixed to the diaphragm 1 with one of the ribs 15 as a
guide, and the voice coil bobbin 2 There is a speaker in which a ring-shaped throat 22 is
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2
disposed between the two and the other rib of the rib group 15 (Patent Document 3). Also, attach
the sub-cone vibrator to the outer periphery of the voice coil bobbin, which is erected at the
center bottom of the speaker frame, and secure at least the distal end widening of this sub-cone
vibrator to the flat diaphragm, In the flat speaker device elastically held by the speaker frame, the
sub-cone vibrating body is constituted by two or more pieces, and the tip spread portion of each
piece of the sub-cone vibrating body is a vibration of the flat plate-like diaphragm There is a flat
type speaker device characterized in that it is fixed to a part of a joint circle portion of the above
(Japanese Patent Application Laid-Open No. 2000-147118).
[0005]
Further, a speaker diaphragm which does not have a dual diaphragm structure according to the
applicant of the present invention has a first diaphragm portion 5, a second diaphragm portion 6
integrally formed with the first diaphragm portion 5, and a first vibration. The first diaphragm
portion 5 and the second diaphragm portion 6 are provided with a mounting portion 7 which is
provided on the back side of the joint portion between the plate portion 5 and the second
diaphragm portion 6 so as to be protruded and to which one end of the voice coil bobbin is
attached. The base material is impregnated with a thermosetting resin, and the mounting portion
7 is formed by curing the thermosetting resin (Patent Document 5). There is also a speaker
diaphragm having a base and a surface material disposed on one side of the base and containing
a woven fabric of polyethylene naphthalate fibers (Patent Document 6). These speaker
diaphragms reduce the transmission loss of the driving force from the voice coil bobbin, and
particularly in the latter case, realize a speaker diaphragm excellent in the balance between the
Young's modulus and the internal loss. Can improve the S / N ratio.
[0006]
JP-A-63-155900 (FIG. 1) JP-A-62-68394 (FIGS. 1 to 3) JP-A-9-247791 (FIG. 3) JP-A-59-171399
(FIGS. 4-8) Patent No. 3846497 (FIGS. 1-4) JP 2007-259261 A
[0007]
However, the speaker vibration system of the conventional double diaphragm structure is not
sufficient.
With the first diaphragm on the front side and the second diaphragm on the back side, the
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speaker vibration system with a double diaphragm structure whose weight tends to be heavy is
generally used to enhance the reproduction efficiency of the speaker. It is necessary to reduce
the weight. In the speaker vibration system having a double diaphragm structure, if rigidity is
insufficient due to weight reduction unless the first diaphragm on the front side and the second
diaphragm on the rear side are respectively designed optimally, the respective diaphragms There
is a problem that the influence of the divided vibration mode in the above appears at a low
frequency. That is, the speaker vibration system of the double diaphragm structure in which the
first diaphragm and the second diaphragm are combined including the bobbin of the voice coil
has a peak on the sound pressure frequency characteristic when the rigidity as the coupled
structure becomes low. -There is a problem that the dip becomes large and the piston vibration
area becomes narrow, which may cause the deterioration of the reproduction sound quality. In
particular, when the first diaphragm on the front side has a surface material including a woven
fabric, the material anisotropy of the woven fabric being strong in the direction of the warp and
weft and weak in the 45-degree angular direction between them. As a result, there is a problem
that the influence of the divided vibration mode of the first diaphragm becomes large.
[0008]
The present invention has been made to solve the problems of the prior art described above, and
its object is to provide a double diaphragm in which a first diaphragm, a second diaphragm, and
a bobbin of a voice coil are connected. It is an object of the present invention to provide a
speaker excellent in reproduction sound quality in which the rigidity of the speaker vibration
system of the structure is high and the peak / dip on the sound pressure frequency characteristic
is small.
[0009]
The speaker according to the present invention includes a substantially cone-shaped first
diaphragm disposed on the front side for emitting a sound wave, and a diaphragm disposed on
the back side of the first diaphragm and connected to the outer periphery of the first diaphragm
on the outer circumferential side And a voice coil including a substantially cylindrical bobbin in
which inner peripheral sides of the first diaphragm and the second diaphragm are respectively
separated and connected, and the first diaphragm is An engagement ridge portion extended so as
to be folded back from the outer peripheral end of the substantially cone-shaped base, defining a
convex ridge on the front side and defining an engagement recess on the rear side of the ridge; A
second diaphragm includes a base including an inner peripheral portion connected to the bobbin,
and a latch which is extended radially outward from the inner peripheral portion of the base and
engages with an engagement recess of the first diaphragm at an outer peripheral end thereof. It
has an engaging portion and an edged portion which defines a plurality of through holes in the
base at a position between the inner circumferential portion and the engaging portion.
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[0010]
Preferably, in the speaker according to the present invention, the through hole defined by the
edge portion of the second diaphragm is a radially long oval or a radially long oval.
[0011]
Preferably, in the speaker of the present invention, the height of the edged portion of the second
diaphragm is formed larger than the thickness of the base of the second diaphragm over the
entire periphery of the through hole.
[0012]
In addition, preferably, in the speaker according to the present invention, each of the rims
defining two adjacent through holes of the second diaphragm forms a rib which is close to
increase the rigidity of the second diaphragm.
[0013]
Preferably, in the speaker of the present invention, the first diaphragm is formed by
impregnating a base material containing a woven or non-woven fabric made of fibers with a
thermosetting resin containing an unsaturated polyester resin, or A second substrate has a base
using a paper material formed by making paper fibers as a base material, and a second
diaphragm has a base using a paper material made by forming paper fibers as a base material.
[0014]
More preferably, in the speaker according to the present invention, the first diaphragm is bonded
to the front side of the base and is woven from plain weave, twill weave or satin weave including
warp and weft. It further has a facing comprising cloth.
[0015]
Preferably, in the speaker according to the present invention, the frame is connected to a damper
in which an inner peripheral end is connected to a bobbin of a voice coil, a frame in which an
outer peripheral part of an edge and an outer peripheral end of the damper are connected, And a
magnetic circuit having a magnetic air gap in which the coil of the coil is disposed.
[0016]
Hereinafter, the operation of the present invention will be described.
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[0017]
The speaker according to the present invention includes a substantially cone-shaped first
diaphragm disposed on the front side for emitting a sound wave, and a diaphragm disposed on
the back side of the first diaphragm and connected to the outer periphery of the first diaphragm
on the outer circumferential side And a voice coil including a substantially cylindrical bobbin in
which inner peripheral sides of the first diaphragm and the second diaphragm are respectively
separated and connected.
Preferably, in the speaker according to the present invention, the outer periphery coupled to the
frame, the inner periphery coupled to the outer periphery of the first diaphragm or the second
diaphragm, and the outer periphery and the inner periphery are defined. A frame having an edge
having a supported movable portion, a damper whose inner peripheral end is connected to the
bobbin of the voice coil, a frame where the outer peripheral portion of the edge and the outer
peripheral end of the damper are connected, And a magnetic circuit having a magnetic air gap in
which a coil of the voice coil is disposed.
Therefore, the speaker of the present invention is an electrodynamic speaker having a speaker
vibration system with a double diaphragm structure.
[0018]
The first diaphragm is extended so as to be folded back from its outer peripheral end, and has an
engaging ridge portion which defines a convex ridge on the front side and defines an
engagement recess on the rear side of the ridge.
The engagement flange portion of the first diaphragm enhances the strength on the outer
peripheral side of the first diaphragm and engages with the annular recess of the edge.
In addition, the second diaphragm has an engagement portion at its outer peripheral end that
engages with the engagement recess of the first diaphragm, and the first adhesive and the second
vibration are applied by the first adhesive applied thereto. The board is connected.
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Therefore, the first diaphragm and the second diaphragm are separated from each other on the
inner peripheral side thereof and coupled to the bobbin of the substantially cylindrical voice coil,
and thus constitute a speaker vibration system that is a strong structure having a substantially
triangular cross section. Do.
The first diaphragm is formed integrally with the base on the inner peripheral side of the
substantially cone-shaped base, with the connecting part connected to the end of the bobbin and
the central part covering the inner peripheral side of the connecting part. It may be in the form
of a dome, or in the form of a cone integrated with a dust cap.
[0019]
Here, the second diaphragm further includes an edged portion which defines a plurality of
through holes in the base at a position between the inner peripheral portion and the engaging
portion.
That is, the base of the second diaphragm is provided with the through holes defined by the
edged portions, and preferably, these through holes are long ovals in the radial direction or long
ovals in the radial direction. It is.
The rim of the second diaphragm defines a through hole to reduce the weight of the second
diaphragm while substantially reducing the area of the diaphragm of the second diaphragm to
radiate radiation from the second diaphragm. Sound can be reduced.
In addition, if the height of the edged portion of the second diaphragm is formed larger than the
thickness of the base of the second diaphragm over the entire periphery of the through hole, the
second diaphragm having a plurality of through holes Even, the rigidity can be sufficiently
enhanced. In the case where each of the edged portions defining two adjacent through holes of
the second diaphragm approaches each other, it is possible to form a rib which enhances the
rigidity of the second diaphragm. Furthermore, by providing an edged portion that defines a
plurality of through holes in the second diaphragm, it is possible to give the rigidity of the second
diaphragm any anisotropy.
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[0020]
Also, specifically, is the first diaphragm a speaker diaphragm in which a base is formed by
impregnating a thermosetting resin containing unsaturated polyester resin into a base material
including a woven or non-woven fabric made of fibers? A speaker diaphragm in which a base
body having a base material made of paper material made of paper fiber as a base material is
formed, preferably a silk made of plain weave, twill weave, or satin weave. It further comprises a
facing comprising a woven fabric of fibers or polyethylene naphthalate fibers on the front side.
The second diaphragm is a speaker diaphragm in which a base having a paper material formed
by paper-making of paper fibers as a base material is molded.
[0021]
In the speaker vibrating system having a double diaphragm structure according to the present
invention, the outer peripheral edge portion of the second diaphragm defined as a portion to
which the inner peripheral portion of the edge is connected is the second diaphragm between the
first diaphragm and the second diaphragm The separation space is formed such that the distance
separating from the engagement portion toward the inner circumferential side increases. By
providing this separated space, the outer peripheral side of the first diaphragm that emits sound
waves on the front side is reinforced by the outer peripheral side of the more rigid second
diaphragm, which has a higher frequency at which divided vibration occurs from the first
diaphragm. As a result, it is possible to push up the frequency of the mode in which the outer
peripheral side starts divided vibration to a higher frequency, and to expand the piston vibration
region.
[0022]
Further, by providing an edged portion for defining a plurality of through holes in the second
diaphragm, any rigidity can be given to the rigidity of the second diaphragm, so the first
diaphragm on the front side is woven Influence of the divided vibration mode of the first
diaphragm due to the material anisotropy of the woven fabric that is strong in the direction of
the warp and weft and weak in the angular direction of 45 degrees between when having a
surface material including cloth By arranging the first diaphragm and the second diaphragm such
that the direction in which the rigidity of the first diaphragm is weak matches the direction in
which the rigidity of the second diaphragm is strong even when It is possible to realize a speaker
excellent in reproduced sound quality with less peak-dip on the sound pressure frequency
characteristic by mutually suppressing divided vibration.
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[0023]
The speaker according to the present invention can provide a speaker excellent in reproduction
sound quality, having high rigidity of a speaker vibration system having a double diaphragm
structure and less peak-dip on sound pressure frequency characteristics.
[0024]
It is a figure explaining the speaker 1 by preferable embodiment of this invention.
(Example 1) It is a principal part enlarged view explaining the speaker vibration system of the
speaker 1 of this invention.
(Example 1) Fig. 1 is a partial cross-sectional perspective view for explaining a speaker vibration
system of a speaker 1 of an example of the present invention. (Example 1) It is a graph
explaining the acoustic characteristic of the speaker 1 of this invention. (Example 1) It is a
partially sectioned perspective view explaining the speaker vibration system of the speaker 100
of a comparative example. (Comparative example 1) It is a graph explaining the acoustic
characteristic of the speaker 100 of a comparative example. (Comparative Example 1) FIG. 10 is
a partial cross-sectional perspective view illustrating a speaker vibration system of a speaker 1a
according to another embodiment of the present invention. (Embodiment 2) FIG. 10 is a partial
cross-sectional perspective view for explaining a speaker vibration system of a speaker 1b
according to another embodiment of the present invention. (Embodiment 3) FIG. 6 is a plan view
for explaining a first diaphragm 5 of a speaker 1c of the present invention. (Example 4) It is a
figure explaining the vibration mode of the speaker 1c of this invention, and the speaker 100c of
a comparative example. (Example 4, Comparative Example 2)
[0025]
Hereinafter, although the speaker by the preferred embodiment of the present invention is
explained, the present invention is not limited to these embodiments.
[0026]
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9
FIG. 1 is a schematic cross-sectional view of a speaker 1 according to a preferred embodiment of
the present invention.
Further, FIG. 2 is an enlarged view of a main part for explaining a speaker vibration system of the
speaker 1, and is a cross-sectional view in which an X portion illustrated in FIG. FIG. 3 is a partial
cross-sectional perspective view for explaining a speaker vibration system of the speaker 1. In
addition, as described later, a part of the structure, an internal structure, and the like of the
speaker 1 are omitted. Further, in the speaker 1, the upper side of the speaker diaphragm 5 as
the first diaphragm to be exposed is the front side, and the lower side to which the magnetic
circuit 10 is attached is the rear side.
[0027]
The speaker 1 is an electrodynamic speaker having a caliber of about 15 cm and provided with a
bullet-like equalizer 9, and is provided with a substantially cone-shaped first diaphragm 5
disposed on the front side for emitting sound waves, and a first diaphragm A substantially coneshaped second diaphragm 6 which is disposed on the back side of the fifth side and is connected
to the outer circumferential side of the first diaphragm 5 on the outer circumferential side, and
the inner circumferential sides of the first diaphragm 5 and the second diaphragm 6 A voice coil
bobbin 2 having a substantially cylindrical shape, which is separated and connected, and a voice
coil 3 wound around the lower end portion of the voice coil bobbin 2 constitute a speaker
vibration system having a double diaphragm structure. The voice coil bobbin 2 and the voice coil
3 are disposed in the magnetic air gap of the magnetic circuit 10 fixed to the frame 8 and
displace in the magnetic air gap according to the input signal so that the speaker of the double
diaphragm structure of the speaker 1 Drive the vibration system. Further, the speaker vibration
system of the double diaphragm structure of the speaker 1 is supported so as to be vibrated in
the vertical direction as illustrated by the damper 4 and the edge 7 whose outer peripheral side
is fixed to the frame 8.
[0028]
The voice coil bobbin 2 is made of, for example, aluminum having a material thickness of 0.05
mm, the voice coil 3 is wound around the lower end thereof, and the reinforcing paper is wound
around the outer curved surface where the voice coil 3 is not wound. In general, they are formed
in a cylindrical shape having a diameter of about 39.0 mm. The voice coil bobbin 2 may also be
formed of polyimide film, duralumin, silter, capton or the like. A tinsel wire (not shown) is
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10
soldered and fixed to the voice coil 3, and the other end of the tinsel wire is fixed so as to be
conductive to a terminal (not shown) fixed to the frame 8. Voice signal current is supplied to the
voice coil 3 through these terminals and the tinsel wire.
[0029]
The inner diameter end of the damper 4 is connected to the outer curved surface of the voice coil
bobbin 2 by an adhesive. The outer diameter end of the damper 4 is adhesively fixed to the
damper fixing portion of the frame 8. The damper 4 may be an annular ring-shaped corrugation
damper which is formed by impregnating a resin such as a phenol resin with a flexible fiber
woven fabric as a base material, and is formed of another material. It is also good. For example, it
may be a butterfly damper which has an arm connecting the inner ring and the outer ring and is
formed of metal or resin. The frame 8 is a frame of aluminum die-cast formed in a basket shape,
and is connected to the magnetic circuit 10 by a plurality of screws. The frame 8 may be an iron
plate frame press-formed into a basket shape corresponding to the speaker vibration system
having a double diaphragm structure.
[0030]
The magnetic circuit 10 has an annular top plate 11 fixed to the frame 8 and a pole which has a
cylindrical pole and a center pole and a flat underplate inserted in a circular hole formed at the
center of the top plate 11. 12 and an annular magnet 13. The top plate 11 and the pole 12 form
a circular magnetic air gap having a uniform width. The magnet 13 is bonded so as to be held
between the top plate 11 and the under plate of the pole 12. The magnet 13 of the present
embodiment is a ferrite based magnet, and may be an Nd-Fe-B based rare earth magnet having a
larger residual magnetization and coercivity, and having a smaller volume or a stronger
coercivity. In the magnetic circuit 10 of the present embodiment, the cancel magnet 14 is
magnetized and coupled on the back side of the underplate of the pole 12 so as to have magnetic
polarity in the reverse direction to the magnet 13, and the back side of the cancel magnet 14.
And a cover 15 magnetically shielded to cover the entire magnetic circuit 10.
[0031]
The equalizer 9 is a shell-shaped member formed of an alloy containing aluminum in the present
embodiment, and is formed on the center pole of the pole 12 of the magnetic circuit 10 so that
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11
the pointed end side protrudes from the neck portion of the first diaphragm 5. It is connected
and fixed. The equalizer 9 fills in the cylindrical internal space formed by the voice coil bobbin 2
and a part of the space surrounded by the first diaphragm 5 having a substantially cone shape,
eliminates air occupying these spaces, and prepares directivity characteristics. Flatten the sound
pressure frequency characteristics. The equalizer 9 connected to the magnetic circuit 10 is
preferably formed of a nonmagnetic member such as brass or resin.
[0032]
The first diaphragm 5 is a diaphragm exposed on the front side when the speaker 1 having the
speaker vibration system having a double diaphragm structure is viewed from the front, and the
first diaphragm 5 is substantially defined by a curved line whose cross-sectional shape is
smoothly continuous. The diaphragm is a cone-shaped diaphragm, and has a substantially coneshaped diaphragm portion 5a and an engaging flange 5b extended so as to be folded back from
the outer peripheral end. The substantially cone-shaped diaphragm portion 5a has an inner
diameter of about 39.5 mm in diameter, an outer diameter of about 113.5 mm in diameter, and a
height of about 26.8 mm. The engagement collar 5b having a length of about 1.5 mm defines a
convex ridge 5c on the front side and an engagement recess 5d on the back of the ridge 5c, as
shown in FIG. Do. The inner diameter end of the first diaphragm 5 is connected to the outer
curved surface of the voice coil bobbin 2 by an acrylic adhesive.
[0033]
The first diaphragm 5 of the present embodiment is a base formed by impregnating a
thermosetting resin with a base material which is a laminate including a woven fabric layer or a
non-woven fabric layer made of inorganic fibers or natural fibers (diaphragm portion 5a , An
engagement flange 5b, a ridge 5c, and an engagement recess 5d. And a facing 5e adhered to the
front side of the base. Specifically, the substrate is obtained by laminating two layers of nonwoven fabric of Technora fiber, impregnating the unsaturated polyester resin, and hot pressing.
Unsaturated polyester has a high curing rate and a low curing temperature, so that the substrate
can be produced by short-time hot press molding. Further, the surface material 5e is obtained by
applying a thermoplastic adhesive to this substrate and drying it, and the woven fabric of PEN
fibers is made to heat press form and integrate these.
[0034]
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The second diaphragm 6 is a diaphragm that hides on the back side when the speaker 1 having
the double diaphragm structure speaker vibration system is viewed from the front side, and is the
first diaphragm 5 whose cross-sectional shape is smoothly continuous. It is a substantially coneshaped diaphragm defined by different R curves and straight lines. The second diaphragm 6 has
a paper base formed by papermaking, and the substantially cone-shaped diaphragm portion 6a
has an inner diameter of about 39.5 mm and an outer diameter of about 111. It is 5 mm, the
height is about 31.2 mm, and the thickness of the substrate is about 0.4 mm on average. Further,
as illustrated in the partial cross-sectional view from the back side of FIG. 3, the second
diaphragm 6 includes a base including an edged portion 6 d that defines the through hole 6 e in
four directions in the radial direction viewed from the center. The approximately cone-shaped
diaphragm portion 6a, which is a diaphragm having, is extended radially outward from the inner
peripheral portion 6c. The inner peripheral portion 6 c of the second diaphragm 6 is connected
to the outer curved surface of the voice coil bobbin 2 by an acrylic adhesive so as to be separated
from the inner diameter end of the first diaphragm 5. The second diaphragm 6 has an
engagement portion 6 b at the outer peripheral end of the diaphragm portion 6 a that engages
with the engagement recess 5 d of the first diaphragm 5.
[0035]
The four through holes 6e formed in the diaphragm portion 6a of the second diaphragm 6 are
provided at positions between the inner peripheral portion 6c and the engagement portion 6b,
and are respectively cut and raised from the diaphragm portion 6a. It is defined by an edged
portion 6d formed as such. The edged portion 6d and the through hole 6e of the second
diaphragm 6 are simultaneously formed when the diaphragm portion 6a is press-formed. The
height of the edged portion 6d is largest near the center of the diaphragm portion 6a and
changes while passing through the entire periphery of the through hole 6e, but the thickness of
the base of the second diaphragm 6 over the entire periphery Is also formed large. In the present
embodiment, the through holes 6 e are elongated in the radial direction. The second diaphragm 6
is reduced in weight by defining four through holes 6 e having a large area, as compared with the
case where the through holes 6 e are not provided. Further, in the second diaphragm 6, when the
edged portion 6d is provided in the diaphragm portion 6a, the cross section of the portion
between the adjacent through holes 6e functions as a rib having a substantially U-shape, so the
voice coil bobbin The portion between 2 and the engagement recess 5 d of the first diaphragm 5
can be reinforced.
[0036]
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The edge 7 is an annular shape or a ring-shaped corrugation edge that vibratably supports a
speaker vibration system having a double diaphragm structure, and an outer peripheral portion 7
a adhesively fixed to an edge fixing portion of the frame 8; An inner peripheral portion 7b
connected to the outer peripheral side of the second diaphragm 6 from the back side, a movable
support portion 7c forming a corrugation between the outer peripheral portion 7a and the inner
peripheral portion 7b, and a corrugation of the movable support portion 7c And an annular
recess 7d engaged with the engagement flange 5b of the first diaphragm 5 from the front side on
the inner peripheral side. The edge 7 of this embodiment is formed by pressure heating a suedelike artificial leather made of ultrafine fibers of polyester having flexibility, and a paper gasket 7e
is adhered to the front side of the outer peripheral portion 7a. ing. The support movable portion
7c of the edge 7 of the present embodiment has a corrugation in which the height of the peak
portion which is convex forward becomes smaller as going from the outer peripheral side to the
inner peripheral side.
[0037]
As shown in FIG. 2, at the outer peripheral end of the diaphragm portion 5a of the first
diaphragm 5, an engagement collar 5b including a base material or a thermosetting resin is
formed. The engagement flange portion 5b functions as a rib that reinforces the diaphragm
portion 5a at the outer peripheral end of the diaphragm portion 5a to enhance the strength on
the outer peripheral side, and on the opposite side of the diaphragm portion 5a to the
substantially cone shape. Since it is formed as a folded ridge portion, a convex ridge portion 5c is
defined on the front side, and an engagement recess 5d is defined on the back side of the ridge
portion 5c. In the case of the speaker 1 of the present embodiment, the second diaphragm 6 has,
at its outer peripheral end, four engaging portions 6b which engage with the engaging recesses
5d of the first diaphragm 5, and Since the inner peripheral portion 7b of the edge 7 is adhesively
fixed, the engagement flange 5b of the first diaphragm 5 engages with the annular recess 7d of
the support movable portion 7c formed by the corrugation of the edge 7.
[0038]
That is, in the speaker 1 of the present embodiment, in the step of bonding the outer peripheral
end of the first diaphragm 5 to the vibration system formed by the second diaphragm 6 and the
edge 7, the engagement flange 5 b of the first diaphragm 5 is Can be bonded to the voice coil
bobbin 2 and the second diaphragm 6 without tilting the first diaphragm 5 by engaging the
annular recess 5 d formed by the corrugation of the edge 7. The second diaphragm 6 has an
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engaging portion 6 b at its outer peripheral end that engages with the engaging recess 5 d of the
first diaphragm 5. Therefore, when the first adhesive Ad 1 is applied to the second diaphragm 6,
the first diaphragm 5 is And the second diaphragm 6 are connected. As shown in FIG. 1, the first
diaphragm 5 and the second diaphragm 6 are separated from each other at their inner peripheral
sides and connected to the voice coil bobbin 2 having a substantially cylindrical shape, so that a
strong structure having a substantially triangular cross section Constitute a speaker vibration
system having a double diaphragm structure.
[0039]
Further, in the speaker vibration system of the double diaphragm structure of the speaker 1 of
the present embodiment, the outer peripheral edge portion of the second diaphragm 6 defined as
a portion to which the inner peripheral portion 7 b of the edge 7 is connected is the first
diaphragm Between the space 5 and the space 5, a separation space Y is formed in which the
distance separating from the engagement portion 6b of the second diaphragm 6 toward the inner
circumferential side becomes large. The separation space Y is a triangular space having a sharp
cross section defined between the back surface of the first diaphragm 5 and the front surface of
the second diaphragm 6 as illustrated in FIG. By providing this separated space Y, the outer
peripheral side of the second diaphragm 6, which is higher in frequency at which the outer
peripheral side of the first diaphragm 5, which radiates sound waves on the front side, is divided
by the first diaphragm 5, is reinforced. Structure is realized.
[0040]
In the case of the present embodiment, the first adhesive Ad1 applied to the engagement recess
5d of the first diaphragm 5 and the engagement portion 6b of the second diaphragm 6 engaged
therewith is a rubber adhesive. The adhesive has a relatively high Young's modulus after curing
and a high hardness and hardness, and an internal loss is small. Further, in the case of the
present embodiment, the second adhesive Ad2 different from the first adhesive Ad1 is applied to
the separation space Y defined between the first diaphragm 5 and the second diaphragm 6 Be
filled. The second adhesive Ad2 is an acrylic resin emulsion adhesive, and is an adhesive having a
relatively small Young's modulus after curing of the adhesive, a small hardness and softness, and
a large internal loss. For example, in the case of the present example, the first adhesive Ad1 has a
Young's modulus of 7.3E + 8 Pa after the adhesive is cured, and an internal loss of 0.161 after
the adhesive is cured. Hardness is about 27 points with a type A durometer conforming to K
6253. On the other hand, the second adhesive Ad2 has a Young's modulus of 6.5 E + 7 Pa after
the adhesive is cured, and an internal loss of 0.30 and a hardness of about 8 points after the
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adhesive is cured. . That is, the first adhesive Ad1 is a harder adhesive than the second adhesive
Ad2. The first adhesive Ad1 and the second adhesive Ad2 are preferably separately applied so as
not to be mixed.
[0041]
In a speaker vibration system having a general double diaphragm structure, the total weight of
the speaker vibration system is heavy because the second diaphragm 6 is disposed behind the
first diaphragm 5, and as a result, the low-efficiency speaker There is a problem of becoming
However, in the speaker 1 of the present embodiment, by providing the through holes 6 e in the
second diaphragm 6, there is an advantage that the weight of the second diaphragm 6 can be
reduced. Further, since the second diaphragm 6 is configured to define the through holes 6 e, the
diaphragm area of the second diaphragm 6 is substantially reduced. As a result, the double
diaphragm structure of the speaker 1 of the present embodiment has an advantage of being able
to reduce unnecessary radiated sound from the second diaphragm 6.
[0042]
FIG. 4 is a graph for explaining the acoustic characteristics of the speaker 1 of the present
invention. As shown in FIG. 3, in the second diaphragm 6 constituting the speaker 1 of the
present embodiment, the width and height of the edged portion 6d at the proximity of the
adjacent through holes 6e where the strength is expected to be the lowest The shape is such that
it becomes smaller as it moves from there to the inner circumferential portion 6c and the
engagement portion 6b on the outer circumferential side. As a result, in the sound pressure
frequency characteristic shown in FIG. 4, a flat characteristic with less disturbance in about the
midrange (about 800 Hz) is obtained. (Comparative example 1)
[0043]
FIG. 5 is a partial cross-sectional perspective view illustrating a speaker vibration system of the
speaker 100 (not shown) of the comparative example. The speaker 100 of the comparative
example is a speaker having a common configuration except that the configurations of the
speaker 1 of the embodiment and the second diaphragm 60 are different. Therefore, the
description of the voice coil bobbin 2, the voice coil 3, the damper 4, the first diaphragm 5, the
edge 7, the frame 8, the equalizer 9 and the magnetic circuit 10 which are common to each other
10-05-2019
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will be omitted.
[0044]
The second diaphragm 60 of the comparative example is a diaphragm that hides on the back side
when the speaker 1 having the double diaphragm structure speaker vibration system is viewed
from the front, and has the shape and dimensions of the cone-shaped diaphragm portion 6 a The
arrangement and the shape of the four through holes 6 e are common to the second diaphragm 6
in the previous embodiment. The second diaphragm 60 is different from the second diaphragm 6
in the previous embodiment in the edged portion defining the through holes 6 e around the four
through holes 6 e of the second diaphragm 6 of the embodiment. While 6 d is defined, no riming
portion is defined around four through holes 6 e of the second diaphragm 60 of the comparative
example.
[0045]
FIG. 6 is a graph illustrating the acoustic characteristics of the speaker 100 of the comparative
example. As shown in FIG. 5, in the second diaphragm 60 constituting the speaker 100 of the
comparative example, an edged portion as in the embodiment is provided in the vicinity of the
adjacent through holes 6 e where the strength is expected to be most reduced. Although the
second diaphragm 60 can be reduced in weight because it is not used, the strength of the
narrowed diaphragm portion 6a is not sufficient. As a result, in the sound pressure frequency
characteristics shown in FIG. 6, divided vibrations occur in about the middle frequency range
(about 800 Hz), so that peak-dip occurs and flat characteristics are not obtained.
[0046]
FIG. 7 is a partially sectioned perspective view illustrating a speaker vibration system of the
speaker 1a (not shown) according to another preferred embodiment of the present invention. The
speaker 1a of the present embodiment is a speaker having a common configuration except that
the configurations of the speaker 1 of the embodiment and the second diaphragm 61 are
different. Therefore, explanation or illustration is omitted about other common composition.
[0047]
10-05-2019
17
The second diaphragm 61 of this embodiment is a diaphragm in common except that the shape
of the edged portion 6da defining the through hole 6e is different from that of the second
diaphragm 6 of the previous embodiment. In the previous embodiment, the edged portion 6d of
the second diaphragm 6 is such that its width and height become largest near the center of the
diaphragm portion 6a and change during the entire circumference of the through hole 6e. In
contrast to this, the height of the edged portion 6da of the second diaphragm 61 in this
embodiment is about 5 mm, which is the same over the entire periphery of the through hole 6e.
Also in the case of the present embodiment, the edged portion 6da provided in the diaphragm
portion 6a functions as a rib whose cross section between the adjacent through hole 6e and the
adjacent through hole 6e has a substantially U-shape, so the voice coil bobbin 2 It is possible to
reinforce the space between and the engagement recess 5 d of the first diaphragm 5.
[0048]
Therefore, also in the speaker 1a of the present embodiment, acoustic characteristics with less
disturbance in the approximately mid-range can be obtained. In the second diaphragm 61 of the
speaker 1 of the present embodiment, the weight of the second diaphragm 61 is reduced by
providing the through holes 6e defined by the edge setting portion 6da, while the second
diaphragm 61 is substantially formed. The area of the diaphragm of the diaphragm 61 can be
reduced to reduce the radiation noise from the second diaphragm 61.
[0049]
FIG. 8 is a partial cross-sectional perspective view illustrating a speaker vibration system of the
speaker 1 b (not shown) according to another preferred embodiment of the present invention.
The speaker 1 b of the present embodiment is a speaker having a common configuration except
that the configurations of the speaker 1 of the embodiment and the second diaphragm 62 are
different. Therefore, explanation or illustration is omitted about other common composition.
[0050]
The second diaphragm 62 of this embodiment is a diaphragm in common except that the shape
of the edged portion 6db defining the through hole 6e is different from that of the second
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diaphragm 6 of the previous embodiment. In the previous embodiment, the edged portion 6d of
the second diaphragm 6 has the largest width and height near the center of the diaphragm
portion 6a and is about 5 mm, while the entire periphery of the through hole 6e is It becomes
lower as it approaches the engaging part 6b on the outer peripheral side or the inner peripheral
part 6c on the inner peripheral side during the crossing, and is about 1 mm at the end of the oval
and larger than the thickness of the base of the second diaphragm 62. Also in the case of the
present embodiment, the edged portion 6db provided in the diaphragm portion 6a functions as a
rib whose cross section between the adjacent through holes 6e and the cross section between the
adjacent through holes 6e is substantially U-shaped. It is possible to reinforce the space between
and the engagement recess 5 d of the first diaphragm 5.
[0051]
Therefore, also in the speaker 1b of the present embodiment, acoustic characteristics with less
disturbance in the approximately mid-range can be obtained. In the second diaphragm 62 of the
speaker 1 of the present embodiment, the second diaphragm 62 is reduced in weight by
providing the through holes 6e defined by the edge setting portion 6db, while the second
diaphragm 62 is substantially formed. The area of the diaphragm 62 can be reduced to reduce
the radiation noise from the second diaphragm 62.
[0052]
FIG. 9 is a plan view illustrating the first diaphragm (not shown) 50 of the speaker 1c (not
shown) according to another preferred embodiment of the present invention. The speaker 1c of
the present embodiment is a speaker having a common configuration except that the
configurations of the speaker 1 of the previous embodiment and the first diaphragm 50 are
different. Therefore, explanation or illustration is omitted about other common composition.
[0053]
In the first diaphragm 50 of this embodiment, a thermosetting resin is used as a base material
which is a laminate including the first diaphragm 5 of the previous embodiment and a woven or
non-woven fabric layer made of inorganic fibers or natural fibers. The base (impact plate portion
5a, engagement ridge portion 5b, ridge line portion 5c, and engagement recess portion 5d) are
formed by being impregnated. In that it comprises a different surface material 50e adhered to
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the front side of the substrate. Specifically, the surface material 50e of the present embodiment is
formed of a plain weave woven fabric of PEN fibers having anisotropy in the direction of the
warp or weft as illustrated in FIG. The first diaphragm 50 applies a thermoplastic adhesive to this
substrate and dries it, and then a plain weave woven fabric of PEN fibers is lined, and these are
integrated by heat pressing. Therefore, the first diaphragm 5 having the surface material 50e
including the woven fabric of plain weave PEN fibers is strong in the direction of the warp or
weft of the woven fabric (dx1 direction, dx2 direction in FIG. 9). It has an anisotropy that it is
weak in the oblique 45-degree angle direction (the dy1 direction and dy2 direction in FIG. 9)
between the weft directions.
[0054]
Further, in the second diaphragm 6 in the present embodiment, the through holes 6 e are defined
in four directions of rotational symmetry with respect to the center point. The four through holes
6e formed in the diaphragm portion 6a of the second diaphragm 6 are provided at positions
between the inner peripheral portion 6c and the engagement portion 6b, and are respectively cut
and raised from the diaphragm portion 6a. It is defined by an edged portion 6d formed as such.
Therefore, the second diaphragm 6 also has an anisotropy that it is strong in the directions of the
remaining four diaphragm portions 6a and the engaging portions 6b and weak in the direction of
the four through holes 6e.
[0055]
In the speaker vibration system of the double diaphragm structure of the speaker 1c of the
present embodiment, the first diaphragm 50 having anisotropy and the four diaphragms having
the surface material 50e including the woven fabric of the plain weave PEN fiber The cut-out
second diaphragms 6 having an anisotropy of being strong in the direction of the portion 6a and
weak in the direction of the four through holes 6e are arranged in a mutually reinforcing
relationship. That is, since the four diaphragm portions 6a and the engagement portion 6b of the
second diaphragm 6 are formed in four directions in rotational symmetry with respect to the
center point of the base, the engagement of the respective second diaphragms 6 is achieved. So
that the straight line connecting the center 6b and the center point deviates about 45 degrees
with the direction of the warp or weft of the woven fabric constituting the surface member 50e
of the first diaphragm 50 (the dx1 direction, dx2 direction in FIG. 9). The first diaphragm 50 and
the second diaphragm 6 are disposed. In other words, the straight line connecting the
engagement portion 6b of the second diaphragm 6 and the center point is 45 degrees diagonally
between the warp and weft directions of the woven fabric constituting the surface member 50e
10-05-2019
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of the first diaphragm 50. The first diaphragm 50 and the second diaphragm 6 are arranged to
coincide with the angular directions (the dy1 direction and the dy2 direction in FIG. 9).
[0056]
That is, in the speaker vibration system of the double diaphragm structure of the speaker 1c, a
direction not along the weave direction, which is a weak direction of the first diaphragm 50
having anisotropy (a direction of 45 degrees oblique between warp and weft) The first
diaphragm 50 and the second diaphragm 50 are arranged so that the directions dy1 and dy2 in
FIG. 9 coincide with the directions of the four diaphragm portions 6a which are the strong
directions of the second diaphragm 6 having anisotropy. A diaphragm 6 is disposed. This is a
relationship in which the first diaphragm 50 and the second diaphragm 6 are arranged such that
the direction in which the rigidity of the first diaphragm 50 is weak matches the direction in
which the rigidity of the second diaphragm 6 is strong. . Therefore, due to the material
anisotropy of the woven fabric constituting the surface material 50e that is strong in the
direction of the warp and weft and weak in the angular direction of 45 degrees between them,
the influence of the divided vibration mode of the first diaphragm 50 is Even when it becomes
large, the divided vibration is mutually suppressed by the second diaphragm 6 having anisotropy,
and the speaker 1c excellent in the reproduction sound quality with few peaks and dips on the
sound pressure frequency characteristic is realized. Can.
[0057]
FIG. 10 is a view for explaining the vibration mode of the speaker 1c of the present invention and
the speaker 100c (not shown) of the comparative example. The speaker 100c of the comparative
example is, in contrast to the speaker 1c of this embodiment, an electrodynamic speaker having a
speaker vibration system which does not have the second diaphragm 6 and does not have a dual
diaphragm structure. The speaker vibration system of the speaker 100c of the comparative
example is different only in that the second diaphragm 6 is not provided.
[0058]
As shown in FIG. 10A, in the speaker 1c of the present embodiment, in the speaker vibration
system of the double diaphragm structure constituted by the voice coil bobbin 2, the first
diaphragm 50 and the second diaphragm 6, Since the second diaphragm 6 is disposed to
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reinforce the surface material 50e of the diaphragm 50 so as to cancel the anisotropy, the
substantially concentric vibration mode distribution as in the case where the surface material
50e is isotropic. Can be seen. On the other hand, as shown in FIG. 10B, in the speaker 100c of
the comparative example, since the second diaphragm 6 for reinforcing the first diaphragm 50 is
not disposed, the difference in the surface material 50e of the first diaphragm 50 is different. The
directionality is prominent, and the vibrational mode distribution with four rotation symmetry
appears from the low frequency. Therefore, in the speaker 100c of the comparative example, the
piston vibration region of the speaker vibration system becomes narrow, and the operation of the
speaker vibration system becomes unstable.
[0059]
Any appropriate woven or non-woven fabric and any suitable thermosetting resin may be
employed as the base material of the first diaphragm 5 or 50 depending on the application and
purpose. The substrate may be a woven fabric or a non-woven fabric alone, or may be a laminate
having a plurality of non-woven fabrics, or a laminate of a woven fabric and a non-woven fabric.
The non-woven fabric typically includes para-aramid fibers, meta-aramid fibers, rayon fibers,
cotton fibers, ultra-high strength polyethylene fibers, polyarylate fibers and the like. Examples of
the woven fabric include polytrimethylene terephthalate and polyethylene naphthalate (PEN)
fibers. The woven or non-woven fibers may be natural fibers or inorganic fibers as described
above.
[0060]
In the surface material 5e or 50e of the first diaphragm 5 of this embodiment, the woven fabric
having anisotropy forming the first diaphragm 5 has a size ratio of about 1.2 for the warp and
weft of the woven fabric. If it is a woven fabric of any of the above plain weave, twill weave, twill
weave, satin weave, and satin weave, the Young's modulus changes greatly depending on the
process, and the first diaphragm 5 including the surface material 5 e has a resonant frequency in
the high region But the sound pressure frequency characteristics tend to be flat, and the high
frequency is not as tight as the auditory sense, making it very easy to hear. The anisotropically
woven fabric forming the surface material 5e is a woven fabric of twill (shrink) weave or
tweezers (tweezers) weave whose size ratio of the warp and weft of the woven fabric is about 1.2
or more. And at least at least silk fibers (including silk raw yarn and silk spinning), cotton fibers,
wool fibers, polyester fibers, polyethylene naphthalate fibers, nylon fibers, aramid fibers, acrylic
fibers, polylactic acid fibers, glass fibers and carbon fibers It is sufficient if it contains one fiber.
Also, in the case of a satin weave, the warps are dense relative to the plain weave and twill weave
10-05-2019
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and the weave points are scattered, so a smooth and glossy appearance is obtained, so it is placed
on the front side. It is suitable for the surface material 50e of the first diaphragm 50 having a
substantially cone shape.
[0061]
In addition, although the speaker 1 of the present embodiment is an electrodynamic speaker
including the bullet-shaped equalizer 9 and not including the dust cap covering the upper end
side of the cylindrical voice coil bobbin 2, the present invention is limited to such an
embodiment. It is not a thing. When the bullet-shaped equalizer 9 is not provided, a dust cap
connected to the voice coil bobbin 2 or the first diaphragm 5 may be provided. In addition, the
first diaphragm 5 formed by impregnating the base material with the thermosetting resin may be
one in which the portion corresponding to the dust cap is integrally formed.
[0062]
The vibration system of the speaker of the present invention can be suitably applied to a speaker
used for various applications (home use, car use). Furthermore, it can be applied to any speaker,
such as a woofer that reproduces particularly in the low frequency region, or a full range speaker
that reproduces also in the high frequency region. Further, the vibration system of the present
invention can be applied not only to the speaker but also to the microphone.
[0063]
1, 1a, 1b, 1c, 100, 100c Speaker 2 voice coil bobbin 3 voice coil 4 damper 5, 50 first diaphragm
5a diaphragm portion 5b engagement flange portion 5c ridge line portion 5d engagement recess
5e, 50e surface material 6, 61, 62 second diaphragm 6a diaphragm portion 6b engagement
portion 6c inner circumferential portion 6d edged portion 6e through hole 7 edge 7a outer
circumferential portion 7b inner circumferential portion 7c support movable portion 7d annular
recess 8 frame 9 equalizer 10 magnetic circuit
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