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JP2010011436

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DESCRIPTION JP2010011436
PROBLEM TO BE SOLVED: To provide a speaker diaphragm integrally formed by hot press
molding using a plain woven fabric coated with a thermoplastic resin as a base material,
achieving both improvement of acoustic characteristics and facilitation of assembly and
reduction of man-hours. Provided is a speaker diaphragm that can be used and an
electrodynamic speaker using the same. SOLUTION: A speaker diaphragm is a speaker
diaphragm integrally formed by hot press molding using a plain woven fabric coated with a
thermoplastic resin as a substrate, and a diaphragm portion to which a voice coil is connected; a
magnetic circuit Alternatively, a thermoplastic resin coated with a fixing portion fixed to the
diaphragm fixing member and an edge portion defined between the diaphragm portion and the
fixing portion, the second laminated structure constituting the edge portion being coated is It
melts and enters the gap between the warp and weft constituting the plain woven fabric and
hardens, and is formed thinner than the first laminated structure constituting the diaphragm
portion and the fixing portion. [Selected figure] Figure 2
Speaker diaphragm and electrodynamic speaker using the same
[0001]
The present invention relates to a speaker diaphragm integrally formed by hot press molding
using a plain woven fabric coated with a thermoplastic resin as a substrate, a dome-shaped
speaker diaphragm using the same, or an annular ring diaphragm An electrodynamic speaker
provided with
[0002]
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1
In the diaphragm used for the conventional dome-shaped speaker, a mixed composition layer of
the vibration loss material resin and the fluorine resin is formed on the surface of the diaphragm
base cloth directly or through the vibration loss material resin layer. Patent Document 1).
In the case of a coated cloth that improves internal loss, there are cloths of cotton or synthetic
fiber impregnated with thermosetting resin such as phenol resin, and the surface is coated with
acrylic resin or urethane resin etc. Adjustment of physical properties such as internal loss is
relatively inexpensive and can be controlled most widely.
[0003]
Another conventional diaphragm includes an electrodynamic loudspeaker diaphragm having one
or more concentrically formed thin portions outside a movable coil attached to the diaphragm
(Patent Document 2). In addition, there is a speaker diaphragm which is integrally thermoformed
so that the edge portion is thin and the body portion is thick by a material containing a plurality
of types of synthetic resins or synthetic resin fibers having different melting points and natural
resin fibers ( Patent Document 3).
[0004]
Alternatively, another conventional diaphragm is provided with a metal layer of an amorphous
material by chemical vapor deposition on one side or both sides of a natural silk fiber,
impregnated with a phenol resin, and then coated with a chlorosulfonated polyethylene resin
multiple times. There is a speaker diaphragm which is formed by heating and forming a base
cloth into a predetermined shape (Patent Document 4).
[0005]
In addition, in a ring type speaker provided with an annular ring diaphragm using the same
diaphragm base cloth as above, in order to improve acoustic characteristics such as frequency
characteristics and directivity characteristics, it is provided on the front surface of the annular
ring diaphragm. Some have equalizers, horns, etc. attached.
The ring diaphragm is fixedly supported on the inner periphery, and the acoustic characteristics
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2
in the high frequency range are improved by arranging a shell-shaped equalizer of a size
comparable to the outer diameter of the ring diaphragm on the inner periphery of the ring
diaphragm Do. Domed speakers and ringed speakers are often used as tweeters for the high
range. For example, in a conventional ring-type speaker by the applicant of the present invention,
improvement of acoustic characteristics such as frequency characteristics including suppression
of unnecessary vibration and abnormal noise is compatible with simplification of assembly and
reduction of the number of parts and man-hours. Magnetic circuit, voice coil disposed in the
magnetic gap of the magnetic circuit, annular ring diaphragm to which the voice coil is
connected, and bullet-shaped equalizer disposed on the inner periphery of the ring diaphragm
for the purpose of A ring-type speaker comprising: an annular equalizer disposed on an outer
periphery of the ring diaphragm; and a plurality of radially extending plate-like connecting arms
connecting the shell-shaped equalizer and the annular equalizer, The arm has a first ridge line
represented by an arc passing through the top end of the shell-like equalizer in the radial crosssectional shape and a shell-like icicle in the radial cross-sectional shape A second ridge line
represented by an arc passing through the bottom end of the izer and a plate-like portion
connecting the first ridge line and the second ridge line, and the cross-sectional shape in the
circumferential direction of the coupling arm represents the first ridge line There is one that is
defined from a first arc, a second arc representing the second ridge having a radius equal to or
more than the radius of the first arc, and a curve representing the plate-like portion (Patent
Document 5) .
[0006]
In an electrodynamic speaker using a speaker diaphragm of these coated cloths, a diaphragm
portion to which a voice coil is attached, an edge portion that vibratably supports the diaphragm
portion as a movable portion, and a magnetic circuit around the edge portion And a fixing
portion fixed to the same. Not only the material and shape of the diaphragm portion, but also the
shape of the edge portion and the fixing structure of the fixed portion affect the acoustic
characteristics as a tweeter for the high frequency range. That is, although the physical
properties required for the diaphragm portion and the physical properties required for the edge
portion are different, in the speaker diaphragm which integrally forms these, improvement of
acoustic characteristics, facilitation of assembly, number of parts, There is a problem that the
prior art may not be sufficient to simultaneously reduce the number of man-hours. In particular,
in the case of the ring diaphragm, since the edge portions are required on the inner peripheral
side and the outer peripheral side of the annular diaphragm portion, there is a problem that the
acoustic characteristics are greatly affected.
[0007]
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Patent No. 2676158 (Fig. 1) Japanese Utility Model Application Publication No. 57-117889 (Figs.
2 to 5) Japanese Utility Model Application No. 58-155196 (Fig. 2) Patent No. 3067360 (Fig. 1)
Patent No. No. 4042732 (Figures 1 and 6)
[0008]
The present invention has been made to solve the above-mentioned problems of the prior art,
and its object is to provide a speaker vibration which is integrally formed by hot press molding
on a plain woven fabric coated with a thermoplastic resin. It is an object of the present invention
to provide a speaker diaphragm capable of achieving both improvement of acoustic
characteristics, facilitation of assembly and reduction of man-hours, and an electrodynamic
speaker using the same.
[0009]
The speaker diaphragm according to the present invention is a speaker diaphragm integrally
formed by hot press molding using a plain woven fabric coated with a thermoplastic resin as a
substrate, the diaphragm portion to which a voice coil is connected, a magnetic circuit or A
thermoplastic resin coated with a fixing portion fixed to the diaphragm fixing member and an
edge portion defined between the diaphragm portion and the fixing portion, the second
laminated structure constituting the edge portion being coated is melted Thus, it enters into the
gap between the warp and weft constituting the plain woven fabric and is hardened, and is
formed thinner than the first laminated structure constituting the diaphragm portion and the
fixing portion.
[0010]
Further, the speaker diaphragm of the present invention further has a metal film and an oxide
film formed on the metal film on the surface of the thermoplastic resin coated on the base
material.
[0011]
Preferably, in the speaker diaphragm of the present invention, the thickness t2 of the second
laminate structure constituting the edge portion is within a range of 50% to 80% of the thickness
t1 of the first laminate structure constituting the diaphragm portion and the fixing portion. The
rigidity G2 of the second laminated structure is smaller than the rigidity G1 of the first laminated
structure, and the internal loss tan δ2 of the second laminated structure is larger than the
internal loss tan δ1 of the first laminated structure. .
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[0012]
Preferably, in the speaker diaphragm of the present invention, the warp and weft constituting the
plain woven fabric as the base material are selected from any of synthetic fiber polyester,
polyurethane, polyimide and rayon monofilament yarn, and they are thermoplastic The resin is
selected from any of synthetic resin polyethylene resin, acrylic resin, and urethane resin.
[0013]
Further, in the speaker diaphragm of the present invention, the metal forming the metal film is
selected from any of titanium, chromium and gold.
[0014]
In the speaker diaphragm of the present invention, the metal film is formed by physical vapor
deposition, and the oxide film is formed by the aging method.
[0015]
More preferably, in the speaker diaphragm of the present invention, the thermoplastic resin
further contains foam beads.
[0016]
Preferably, in the speaker diaphragm of the present invention, the diaphragm portion is an
annular ring diaphragm portion, and the fixing portion is an inner peripheral fixing portion fixing
the inner peripheral side of the ring diaphragm portion; An inner peripheral edge portion
including an outer peripheral fixing portion for fixing an outer peripheral side of the ring
diaphragm portion, the edge portion being defined between the ring diaphragm portion and the
inner peripheral fixing portion, the ring diaphragm portion and an outer peripheral And a
peripheral edge portion defined between the fixing portion and the fixing portion.
[0017]
Further, an electrodynamic speaker according to the present invention includes the abovedescribed speaker diaphragm, a magnetic circuit, and a voice coil disposed in a magnetic gap of
the magnetic circuit and coupled to the speaker diaphragm.
[0018]
The electrodynamic speaker according to the present invention includes a speaker diaphragm
including the above-mentioned ring diaphragm portion, a magnetic circuit, an equalizer coupled
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to the magnetic circuit, and a magnetic gap of the magnetic circuit and coupled to the speaker
diaphragm. And a voice coil.
[0019]
Hereinafter, the operation of the present invention will be described.
[0020]
The speaker diaphragm according to the present invention is a speaker diaphragm integrally
formed by hot press molding using a plain woven fabric coated with a thermoplastic resin as a
substrate, the diaphragm portion to which a voice coil is connected, a magnetic circuit or A fixing
portion fixed to the diaphragm fixing member and an edge portion defined between the
diaphragm portion and the fixing portion are integrally formed.
Further, an electrodynamic speaker according to the present invention includes the abovedescribed speaker diaphragm, a magnetic circuit, and a voice coil disposed in a magnetic gap of
the magnetic circuit and coupled to the speaker diaphragm.
The diaphragm fixing member is a member for fixing the fixing portion of the speaker diaphragm
to a magnetic circuit or an equalizer.
[0021]
Here, the plain woven fabric used for the speaker diaphragm of the present invention is a plain
woven thin silk fabric called taffeta, or a plain woven thin woven fabric using filament yarns of
synthetic fibers.
Plain woven fabrics are composed of densely woven warp and weft yarns, and warp and weft
yarns are monofilament yarns of synthetic fibers such as polyester, polyurethane, polyamide,
rayon and the like, multifilaments bundled without being subjected to twisting processing. It is a
yarn configured as a yarn.
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The plain woven fabric is densely woven using untwisted yarn, so the aperture ratio is small and
there is no fear of back leakage of the thermoplastic resin to be coated, and it is used for the
diaphragm of the speaker Is suitable.
[0022]
In the speaker diaphragm of the present invention, the first laminated structure constituting the
diaphragm portion and the fixing portion constitutes the edge portion when the base material
having the thickness t0 is coated with the thermoplastic resin to form the thickness t1. The
thickness t2 of the second laminated structure is thinner than that of the first laminated
structure.
That is, in the second laminated structure constituting the edge portion, the coated thermoplastic
resin is melted to enter into the gap between the warp and weft constituting the plain woven
fabric and hardened, and the first laminated structure is formed by heat pressing. The thickness
t2 is thinner than the thickness t1 (50% to 80% of the thickness t1).
Therefore, the rigidity G2 of the second laminated structure is smaller than the rigidity G1 of the
first laminated structure, and the internal loss tan δ2 of the second laminated structure is larger
than the internal loss tan δ1 of the first laminated structure. it can.
[0023]
As a result, in spite of being an integrated speaker diaphragm, the first laminated structure of the
diaphragm portion and the second laminated structure of the edge portion can have shapes and
physical properties suitable for their respective roles. .
This is because in the second laminated structure of the edge portion to be thinned, the
monofilament yarns of the plain woven fabric are slippery, and the coated thermoplastic resin
melts and enters the gaps of the warp and weft to be cured. On the other hand, compared with
the first laminated structure of the diaphragm portion and the fixed portion which are not
thinned, the layer configuration can be adjusted so as to differ not only in thickness but also in
physical properties such as Young's modulus, internal loss and rigidity. This is because the
improvement can be made compatible with the ease of assembly and the reduction of man-hours.
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In the case where the thermoplastic resin to be coated further contains a foamed bead, the
above-described physical properties, including the foaming ratio, are different between the first
laminated structure of the diaphragm portion and the fixed portion and the second laminated
structure of the edge portion. Can be adjusted.
[0024]
Further, in a further preferable case, the speaker diaphragm of the present invention further has
a metal film and an oxide film formed on the metal film on the surface of the thermoplastic resin
coated on the base material.
The metal forming the metal film is selected from any of titanium, chromium, and gold, which is a
metal having a smaller linear expansion coefficient than a thermoplastic resin, and the metal film
is formed by physical vapor deposition, that is, sputtering. An oxide film is formed by the aging
method.
Since the synthetic fiber constituting the plain woven fabric of the base has a linear expansion
coefficient larger than that of the thermoplastic resin coated on the base, in the speaker
diaphragm of the present invention, from the base having the largest linear expansion coefficient,
Next, next to the thermoplastic resin having a small linear expansion coefficient, a metal film
having the smallest linear expansion coefficient is formed.
Therefore, it is possible to realize a speaker diaphragm having excellent shape stability, in which
internal loss can be increased and deformation due to heat is not easily generated.
[0025]
When the diaphragm portion is an annular ring diaphragm portion, in the speaker diaphragm of
the present invention, the fixing portion fixes an inner peripheral fixing portion for fixing the
inner peripheral side of the ring diaphragm portion, and the ring diaphragm An inner peripheral
edge portion including an outer peripheral fixing portion fixing an outer peripheral side of the
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portion, the edge portion being defined between the ring diaphragm portion and the inner
peripheral fixing portion, a ring diaphragm portion and an outer peripheral fixing portion And a
peripheral edge portion defined between the two.
The ring is further provided with an equalizer coupled to the magnetic circuit, and the diaphragm
inner periphery fixing member and the diaphragm outer periphery fixing member fixing the
inner periphery fixing portion and the outer periphery fixing portion of the speaker diaphragm to
the magnetic circuit or equalizer. Type speakers are realized.
In the ring type speaker, since the inner peripheral edge portion on the inner peripheral side of
the annular diaphragm portion and the outer peripheral edge portion on the outer peripheral
side are required, the edge portions are made to have the above-mentioned second laminated
structure, thereby making the edge Even in the case of a ring diaphragm in which parts are
integrated, acoustic characteristics can be improved.
[0026]
ADVANTAGE OF THE INVENTION The speaker diaphragm of this invention and the
electrodynamic-type speaker using this can make improvement of an acoustic characteristic,
simplification of an assembly, and reduction of a man-hour be reconciled.
[0027]
In the speaker diaphragm of the present invention, the object is to achieve both improvement of
acoustic characteristics, facilitation of assembly and reduction of man-hours, integrally using a
plain woven fabric coated with a thermoplastic resin as a substrate by heat pressing A speaker
diaphragm to be formed, comprising: a diaphragm portion to which a voice coil is connected; a
fixing portion fixed to a magnetic circuit or a diaphragm fixing member; an edge portion defined
between the diaphragm portion and the fixing portion The second laminated structure forming
the edge portion melts the coated thermoplastic resin and enters the gaps of the warp and weft
constituting the plain woven fabric and hardens to form the diaphragm portion and the fixing
portion This is achieved by forming a thin-walled structure as compared to the first laminated
structure.
[0028]
Hereinafter, although the speaker diaphragm by the preferable embodiment of this invention and
the electrodynamic-type speaker using the same are demonstrated, this invention is not limited
to these embodiments.
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[0029]
FIG. 1 is a view for explaining a ring-type speaker 1 according to a preferred embodiment of the
present invention.
FIG. 1A is a perspective view of the ring type speaker 1 as viewed from the front direction, and
FIG. 1B is an exploded development view explaining the ring type speaker 1.
The ring-type speaker 1 of the present embodiment is a speaker with a call aperture of 3 cm
used as a tweeter for high-range reproduction.
The ring-type speaker 1 includes an equalizer 2 molded of a resin exposed on the front side, an
annular ring diaphragm 3, a voice coil 4 connected to the ring diaphragm 3, and a magnetic
circuit 10. . The magnetic circuit 10 is composed of a yoke 11, a magnet 12, and a plate 13.
These are connected and fixed by an adhesive. The magnetic circuit 10 has an annular magnetic
air gap between the yoke 11 and the plate 13, and a DC magnetic field is formed in the magnetic
air gap.
[0030]
The equalizer 2 is formed of, for example, an ABS resin which is excellent in moldability. The
equalizer 2 has an outer peripheral portion 21 having a convex external shape on the front side
to form a shell-shaped equalizer, an outer peripheral portion 22 forming an annular equalizer,
and a connecting arm 23 for integrally connecting these. , Which are integrally molded of resin,
as a result of which the radiation holes 20 are formed. The equalizer 2 improves acoustic
characteristics such as reproduction frequency characteristics and works to suppress
unnecessary vibration and abnormal noise, like the connected equalizer included in the ring-type
speaker of Patent Document 4 described above.
[0031]
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10
FIG. 2 is a diagram for explaining the ring diaphragm 3 of the present embodiment and the voice
coil 4 connected thereto. Specifically, FIG. 2 (a) is an enlarged cross-sectional view of the ring
diaphragm 3 and the voice coil 4, and FIG. 2 (b) is an enlarged view of x2 in the vicinity of the
inner peripheral fixing portion 3c. Is an enlarged view of x1 near the outer peripheral fixing
portion 3b. The voice coil 4 is configured by winding a coil 6 around a cylindrical bobbin 5.
When the ring-type speaker 1 is assembled, the coil 6 of the voice coil 4 connected to the ring
diaphragm 3 is disposed in this magnetic gap. Therefore, when an audio signal current is
supplied to the coil 6, a driving force acts on the voice coil 4, and the ring diaphragm 3 exposed
from the radiation hole 20 is vibrated to emit a sound wave.
[0032]
As shown in FIG. 2, the ring diaphragm 3 is fixed to the diaphragm portion 3a to which the voice
coil 4 is connected, the outer peripheral fixing portion 3b and the inner peripheral fixing portion
3c fixed to the magnetic circuit, and the outer periphery fixing to the diaphragm portion 3a. An
outer peripheral edge portion 3d defined between the outer peripheral edge portion 3b and the
inner peripheral edge portion 3e defined between the diaphragm portion 3a and the inner
peripheral fixed portion 3c is provided. The ring diaphragm 3 has an outer diameter radius r1 of
19.5 mm, an inner radius r2 of 5.05 mm, a width rs of the diaphragm portion 3a of about 8.35
mm, a width of the outer peripheral fixing portion 3b and an inner peripheral fixing portion 3c.
The rw is about 3.06 mm. The diaphragm portion 3a defined by two rolls connected in crosssectional shape has one end of the bobbin 5 of the voice coil 4 connected and fixed by an
adhesive on a circle whose center radius r0 is 12.29 mm. . The flat outer peripheral fixing
portion 3 b and the inner peripheral fixing portion 3 c are held between the equalizer 2 and the
magnetic circuit 10 and fixed with an adhesive.
[0033]
The ring diaphragm 3 of this example is based on a plain weave taffeta using 75 de and 100 de
thick silks made of monofilament yarns of polyester fibers for the warp and weft, as a base
material coated with a thermoplastic resin. . This taffeta is plain weave without being subjected to
twisting processing under the condition of the number of vertical 110 pieces / inch and
horizontal 80 pieces / inch, and the basis weight is 82 g / m <2>. A chlorosulfonated
polyethylene resin is coated as an undercoat on the surface of the fabric of this taffeta, and a
resin similar to the undercoat is further coated as a top coat, and the basis weight is 98 g / m
<2>, and the thickness t0 is 0.11 mm. The material can be obtained. Since the taffeta is densely
woven using non-twisted yarn, the aperture ratio is small, and the back leakage of the resin to be
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coated can be reduced.
[0034]
The ring diaphragm 3 is made of a taffeta coated resin coated base at a mold temperature of 210
° C. at a molding pressure of 480 kg and a molding time of 18 sec. Hot press molding under the
conditions of The shape of the ring diaphragm 3 and the thickness of each portion are adjusted
by the clearance of the heat-pressing die. The diaphragm portion 3a, the outer peripheral fixing
portion 3b and the inner peripheral fixing portion 3c of the ring diaphragm 3 of the present
embodiment can be given respective shapes by heat pressing, but can be made substantially
equivalent to the thickness of the resin coated substrate . Specifically, in the first laminated
structure representing the layer structure of the diaphragm portion 3a, the outer peripheral
fixing portion 3b, and the inner peripheral fixing portion 3c, values of the thickness t1 and the
like are as follows. In addition, the shape and thickness of the diaphragm part 3a can be variously
changed by selecting the base material which gave the resin coating to the taffeta suitably, and
adjusting a die shape and clearance. (Example 1) First laminated structure: (diaphragm portion
3a, outer peripheral fixing portion 3b, inner peripheral fixing portion 3c) thickness t1 0.11 mm
basis weight 98.0 g / m <2> density 0.89 g / cm <3> Young's modulus 9.11E + 8 dyne / cm <2>
internal loss tan δ1 0.043 rigidity G1 1.21E-4 N / m <2>
[0035]
On the other hand, the outer peripheral edge portion 3d and the inner peripheral edge portion 3e
make the die clearance narrower, and the thickness t1 of the first laminated structure
constituting the diaphragm portion 3a, the outer peripheral fixing portion 3b and the inner
peripheral fixing portion 3c. It is formed in a thinner shape than that. The outer peripheral edge
portion 3d and the inner peripheral edge portion 3e are bent portions at the outer peripheral end
and the inner peripheral end of the diaphragm portion 3a, and even if the width in the crosssectional shape is small, a layer different from the above first laminated structure It has a thinwalled structure having a thickness t2. That is, as described later, in the second laminated
structure, the coated thermoplastic resin melts and enters the gaps of the warp and weft
constituting the plain woven fabric to be cured, and the thickness of the first laminated structure
by heat pressing The thickness t2 is smaller than the thickness t1 (50% to 80% of the thickness
t1). (Example 1) Second laminated structure: (outer peripheral edge 3d, inner peripheral edge 3e)
Thickness t2 0.08 mm (about 73% compared to t1) basis weight 95.6 g / m <2> density 1.20 g /
Cm <3> Young's modulus 4.34 E + 8 dyne / cm <2> internal loss tan δ 2 0.106 stiffness G 2
2.22 E-5 N / m <2>
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[0036]
That is, the rigidity G2 of the second laminated structure of the ring diaphragm 3 is smaller than
the rigidity G1 of the first laminated structure, and the internal loss tan δ2 of the second
laminated structure is the internal loss tan δ1 of the first laminated structure. It is large by
comparison. In the case of the first embodiment, even in the case of the speaker diaphragm
which is integrally formed with the diaphragm portion and the edge portion by hot press
molding, the outer peripheral edge 3d and the inner peripheral edge 3e are compared with the
diaphragm 3a. The rigidity can be reduced to be flexible and function as a compliance having a
springiness, and the internal loss of the edge portion can be increased to quickly converge the
inherent resonance to improve the quality of the sound to be reproduced.
[0037]
FIG. 3 is an enlarged photograph for explaining the appearance of the surface of the ring
diaphragm 3 of the first embodiment. FIG. 3 (a) is the surface of the diaphragm portion 3a, and
FIG. 3 (b) is the surface of the outer peripheral edge 3d. Since the ring diaphragm 3 uses a base
material with a resin coating applied to the taffeta, in the first laminated structure of the
diaphragm portion 3a, the coated resin may be dense because the pressing pressure may not be
strong. It is hard to get in between the fibers with a small open area ratio. On the other hand, in
the second laminated structure of the outer peripheral edge 3d and the inner peripheral edge 3e
to which the pressing pressure is applied strongly, since the warp and weft are not subjected to
twisting, monofilament yarns slip easily, and the coating resin on the fabric surface Melts into the
gaps between the monofilament yarns, and is thinned and hardened. As described above, by
using the taffeta as the base material, the layer configuration of the diaphragm portion and the
edge portion can be adjusted regardless of the same material, and the above-described change in
physical properties can be achieved.
[0038]
FIG. 4 is a diagram for explaining the ring diaphragm 30 of the comparative example 1 and the
voice coil 4 connected thereto. Moreover, FIG. 5 is an enlarged photograph explaining the
appearance of the material surface of the ring diaphragm 30 of Comparative Example 1. As
shown in FIG. That is, the ring diaphragm 30 of Comparative Example 1 does not use the taffeta
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as in Example 1, but uses a substrate in which the fabric is resin-coated on a woven fabric made
of twisted yarn, and has approximately the same dimensions as Example 1. This diaphragm is
provided with an outer peripheral edge portion 30d and an inner peripheral edge portion 30e
which are not thinned even though they are present. Therefore, the parts in common with the
above-described first embodiment are given the same reference numerals, and the description
thereof is omitted.
[0039]
The ring diaphragm 30 of Comparative Example 1 is made of a woven fabric of polyester fibers
coated with a chlorosulfonated polyethylene resin as a base material and has a total basis weight
of 120 g / m <2> and a thickness t0 of 0.142 mm. It is a base material. A woven fabric made of
twisted yarn has a problem in that the filaments are difficult to slip because the yarns are tightly
intertwined, and the fibers can not follow even if a high press pressure is applied to reduce the
thickness. In addition, even in the case of using the same yarn count as in the taffeta as in
Example 1, the twisting yarn becomes a thinner yarn and the opening ratio of the fabric becomes
larger, so the coating resin gets into the opening, Slippage between yarns can be suppressed.
[0040]
Therefore, in the ring diaphragm 30 of Comparative Example 1, the outer peripheral edge
portion 30d and the inner peripheral edge portion 30e can not be thinned even under high
pressing pressure similar to that of the ring diaphragm 3 of the first embodiment. Specifically, in
the ring diaphragm 30, the values of the thickness t1 and the like are as follows. (Comparative
Example 1) First stacked structure: (diaphragm portion 30a, outer peripheral fixing portion 30b,
inner peripheral fixing portion 30c) thickness t1 0.142 mm basis weight 120.0 g / m <2> density
0.85 g / cm <3> Young's modulus 9.62E + 8 dyne / cm <2> internal loss tan δ1 0.036 rigidity
G1 2.75E-4 N / m <2>
[0041]
On the other hand, in the second laminated structure representing the layer structure of the
outer peripheral edge portion 30d and the inner peripheral edge portion 30e, values such as the
thickness t2 are as follows. For example, the thickness t2 is only a change of about 94% as
compared to the thickness t1, and the other numerical values are not significantly different from
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the first laminated structure. (Comparative example 1) Second laminated structure: (outer
peripheral edge 30d, inner peripheral edge 30e) Thickness t2 0.133 mm (about 94% compared
to t1) basis weight 114.0 g / m <2> density 0.86 g / Cm <3> Young's modulus 9.33 E + 8 dyne /
cm <2> internal loss tan δ2 0.041 rigidity G2 2.20E-4 N / m <2>
[0042]
As described above, in the case of the ring diaphragm 3 of the first embodiment, the taffeta is
used as the base material, and since the coating resin is intruded between the filament yarns, the
weight per unit area does not change significantly and only the thickness decreases. Density
increases. On the other hand, in the ring diaphragm 30 of Comparative Example 1, since a woven
fabric of twisted yarn is used as the base material, the thickness hardly changes, and as a result,
the density does not change, and the diaphragm portion and the edge portion Can not adjust the
layer structure of
[0043]
In the case of the ring diaphragm 3 of the first embodiment using a taffeta as the base material,
the value of the thickness t2 or the like of the second laminated structure representing the layer
structure of the outer peripheral edge portion 30d and the inner peripheral edge portion 30e is
the diaphragm portion Although it is about 73% of the thickness t1 of the first laminated
structure constituting the outer peripheral fixing portion 3b and the inner peripheral fixing
portion 3c, the thickness t2 of the second laminated structure is preferably, for example, Example
1, below. As shown in the case of Example 2, Example 3, and Example 4 (not shown), it is
preferable to set in 50%-80% of the thickness t1 of a 1st laminated structure. The description of
the common first laminated structure is omitted.
[0044]
(Example 2) Second laminated structure: (outer peripheral edge 3d, inner peripheral edge 3e)
Thickness t2 0.077 mm (about 70% compared to t1)
[0045]
(Example 3) Second laminated structure: (outer peripheral edge 3d, inner peripheral edge 3e)
Thickness t2 0.079 mm (about 72% compared to t1)
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[0046]
(Example 4) Second laminated structure: (outer peripheral edge 3d, inner peripheral edge 3e)
Thickness t2 0.06 mm (about 54% compared to t1) basis weight 83.4 g / m <2> density 1.39 g /
Cm <3> Young's modulus 2.12E + 8 dyne / cm <2> internal loss tan δ2 0.114 stiffness G2
4.58E-6 N / m <2>
[0047]
In any case, the rigidity G2 of the second laminated structure is smaller than the rigidity G1 of
the first laminated structure, and the internal loss tan δ2 of the second laminated structure is
larger than the internal loss tan δ1 of the first laminated structure. Become.
Therefore, the rigidity of the outer peripheral edge 3d and the inner peripheral edge 3e is
lowered and softened as compared with the diaphragm portion 3a to function as a compliance
having a spring property, and the internal loss of the edge is increased to make a unique
resonance. The convergence can be made quickly to improve the quality of the audio to be
reproduced.
[0048]
FIG. 6 is a graph showing the on-axis 1 m sound pressure frequency characteristics of the ringtype speaker of the present embodiment.
6 (a) shows the case of the ring type speaker 1 using the ring diaphragm 3 of the first
embodiment, FIG. 6 (b) shows the case of the second embodiment, and FIG. 6 (c) shows the case
of the third embodiment. FIG. 6D shows the case of the fourth embodiment.
In the case of the ring type speaker 1 of the present embodiment, a large peak dip does not occur
in the reproduction band of 10000 Hz or more up to the peak of the high frequency band limit
frequency fh of about 50000 Hz or more, and is substantially flat. It shows frequency
characteristics. As described above, in the ring-type speaker 1 of the present embodiment, the
reproduction frequency band can be widened, and the acoustic characteristics can be improved.
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[0049]
On the other hand, FIG. 7 is a graph showing the on-axis 1 m sound pressure frequency
characteristics of the ring type speaker (not shown) of the comparative example. FIG. 7A shows
the case of a ring type speaker using the ring diaphragm 30 of Comparative Example 1 described
above, and FIG. 7B shows the case of Comparative Example 2 described below. Comparative
Example 2 is a case where the thickness t2 of the second laminated structure is set to, for
example, 43% and half or less of the thickness t1 of the first laminated structure, and it may not
be preferable to make the thickness too thin. In the case of the ring-type speakers of Comparative
Example 1 and Comparative Example 2, significant peak-dip occurs in the band of about 25000
Hz to about 30000 Hz, and it can be seen that the ring diaphragm 3 is divided and vibrated.
(Comparative Example 2) Second stacked structure: (outer peripheral edge 30d, inner peripheral
edge 30e) Thickness t2 0.047 mm (about 43% compared to t1)
[0050]
The warp yarns and weft yarns constituting the plain woven fabric of the above embodiment are
polyesters of synthetic fibers, but are not limited thereto, and they may be selected from any of
polyurethane, polyimide and rayon monofilament yarns. Good. Further, the thermoplastic resin is
not limited to the chlorosulfonated polyethylene resin, and may be selected from any of synthetic
resins of polyethylene resin, acrylic resin, and urethane resin.
[0051]
In addition, when the thermoplastic resin further includes foam beads, the expansion ratio p1 at
the thickness t1 of the first laminated structure and the expansion ratio p2 at the thickness t2 of
the second laminated structure can be made different. . Specifically, Example 5 is based on a
chlorosulfonated polyethylene resin containing 10% of foamed beads coated on both sides of the
same substrate as in Example 1 above. By further narrowing the mold clearance, the thickness t1
of the first laminated structure in which the outer peripheral edge portion 3d and the inner
peripheral edge portion 3e constitute the diaphragm portion 3a, the outer peripheral fixing
portion 3b and the inner peripheral fixing portion 3c The thin film is formed as in the other
embodiments described above.
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[0052]
(Example 5) First laminated structure: (diaphragm portion 3a, outer peripheral fixing portion 3b,
inner peripheral fixing portion 3c) thickness t1 0.15 mm basis weight 114.0 g / m <2> density
0.76 g / cm <3> Young's modulus 8.93E + 8 dyne / cm <2> internal loss tan δ1 0.054 rigidity
G1 3.01E-4 N / m2 expansion ratio p1 14% second laminated structure: (peripheral edge 3d,
inner peripheral edge 3e) thickness t2 0 .11 mm (about 73% as compared to t1) B / W 111.2 g /
m <2> density 1.01 g / cm <3> Young's modulus 4.25E + 8 dyne / cm <2> internal loss tan δ2
0.133 rigidity G2 5. 66E-5N / m <2> Foaming magnification p2 16%
[0053]
As described above, since the resin to be coated contains foam beads, the difference in internal
loss at the outer peripheral edge 3 d and the inner peripheral edge 3 e can be further increased
as compared to the diaphragm portion 3 a.
In order to form the outer peripheral edge portion 3d and the inner peripheral edge portion 3e in
a thin-walled shape, a resin made of the above synthetic resin mixed with a foam such as beads is
coated on a cloth, and the diaphragm portion 3a has a predetermined mold clearance. The inner
peripheral edge 3d and the inner peripheral edge 3e may be kept in a solid state without foaming
by keeping the mold clearance about the thickness of the cloth.
[0054]
Next, the case where the ring diaphragm 3 further has a metal film and an oxide film formed on
the metal film on the surface of the thermoplastic resin will be described. Chlorosulfonated
polyethylene resin is coated as an undercoat on a plain weave taffeta using 75 de and 100 de
thick silk yarn made of monofilament yarn of polyester fiber as in Example 1 for the warp and
weft, and further top As a coat, a substrate coated with a resin similar to the undercoat is
obtained, and a metal film and an oxide film formed on the metal film are further formed on the
surface of the thermoplastic resin. Specifically, this polyester woven fabric coated with resin is
installed in a sputtering device in a wound roll shape, and after being vacuumed, the coating
resin surface is improved to improve the adhesion between the coating resin surface and the
metal film. Plasma discharge treatment is performed, and crystal growth is performed to a film
thickness of 600 Å ± 10% with pure titanium as a target. At this time, the dough feed rate is 15
cm / min, and after physical vapor deposition, the wound roll is taken out of the apparatus, aged
at 40 to 60 ° C./24 to 48 hr, and oxidized on the metal surface. Form a film.
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[0055]
The ring diaphragm 3 of this embodiment is obtained by molding the above-described sputtered
material under the conditions of a mold temperature of 210 ° C. at a molding temperature of
480 kg for a molding pressure of 18 seconds, and the first embodiment 1 described above
Although having substantially the same size, weight, and thickness as the above, it exhibits a
higher internal loss. That is, in the first laminated structure of the diaphragm portion 3a, the
outer peripheral fixing portion 3b, and the inner peripheral fixing portion 3c, since the metal film
is further provided on the surface of the thermoplastic resin, the internal friction between
different materials is larger. Thus, the characteristics as a speaker diaphragm can be further
improved. (Example 6) First laminated structure: (diaphragm portion 3a, outer peripheral fixing
portion 3b, inner peripheral fixing portion 3c) thickness t1 0.11 mm basis weight 98.0 g / m <2>
density 0.89 g / cm <3> Young's modulus 6.34E + 9 dyne / cm <2> internal loss tan δ1 0.076.
Rigidity G1 8.44E-4N / m <2>
[0056]
On the other hand, the outer peripheral edge portion 3d and the inner peripheral edge portion
3e, as in the first embodiment, further narrow the die clearance, and constitute the diaphragm
portion 3a, the outer peripheral fixing portion 3b and the inner peripheral fixing portion 3c. It is
formed thinner than the thickness t1 of the first laminated structure. In the outer peripheral edge
3d and the inner peripheral edge 3e of the thickness t2 having the second laminated structure
different from the first laminated structure described above, even if the metal film is provided as
in the present embodiment, it is hot pressed The coated thermoplastic resin melts and penetrates
into the gaps between the warp and weft constituting the plain woven fabric and hardens, and
the thickness t2 (50% to 80% of the thickness t1) is thinner than the thickness t1 of the first
laminated structure. %). In addition, as shown in the prior art described in Patent Document 4, if
the metal film is disposed so as to be sandwiched in between, warps constituting the plain woven
fabric and the woven fabric even if the thermoplastic resin coated by heat pressing is melted
Since it is difficult for the weft to enter the gap, it is difficult to make the thickness of the outer
peripheral edge 3 d and the inner peripheral edge 3 e thinner than the thickness of the first
laminated structure. (Example 6) Second laminated structure: (outer peripheral edge 3d, inner
peripheral edge 3e) Thickness t2 0.08 mm (about 73% compared to t1) basis weight 95.6 g / m
<2> density 1.20 g / Cm <3> Young's modulus 3.45E + 9 dyne / cm <2> Internal loss tan δ 2
0.127 Stiffness G 2 1.77E-4N / m <2>
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[0057]
That is, the rigidity G2 of the second laminated structure of the ring diaphragm 3 is smaller than
the rigidity G1 of the first laminated structure, and the internal loss tan δ2 of the second
laminated structure is equal to the internal loss tan δ1 of the first laminated structure. It is large
by comparison. In the case of the sixth embodiment, even in the case of the speaker diaphragm
formed integrally with the diaphragm portion and the edge portion by heat press molding, the
outer peripheral edge portion 3d and the inner peripheral edge portion 3e are compared with the
diaphragm portion 3a. The rigidity can be reduced to be flexible and function as a compliance
having elasticity, and the internal loss of the diaphragm portion and the edge portion can be
further increased. As a result, the inherent resonance is rapidly converged and reproduced. Voice
quality can be improved.
[0058]
Here, the metal film is made of titanium, chromium, or gold, which is a metal having a smaller
linear expansion coefficient than each of the synthetic fiber forming the plain woven fabric of the
base material and the thermoplastic resin coated on the base material. It is preferable to select
from any of the above. For example, in the case of the present embodiment, the linear expansion
coefficient of the chlorosulfonated polyethylene resin is smaller than the linear expansion
coefficient of the polyester fiber constituting the plain woven fabric of the base material, and the
linear expansion coefficient of titanium is even smaller. Therefore, since the ring diaphragm 3 of
the present embodiment is formed by being stacked in the order of large linear expansion
coefficient, it is caused by heat as compared with the prior art in which the metal film is disposed
so as to be sandwiched therebetween. There is an advantage that deformation is unlikely to occur
and the shape stability is excellent.
[0059]
Further, as the metal forming the metal film, chromium or gold having relatively high corrosion
resistance may be used in addition to titanium described above. In addition, in the metal film
formed to have a crystal structure by physical vapor deposition, an oxide film is further formed
by an aging method, so cracking is less likely to occur even if a large pressure is applied by heat
pressing. As in the present embodiment, the base material coated with the thermoplastic resin
may be installed in a sputtering apparatus in a wound roll shape to form a metal film, or the
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shape of the ring diaphragm 3 may be obtained by heat pressing. After that, each ring diaphragm
3 may be sputtered. The physical vapor deposition method is not limited to the sputtering
process of the above-described embodiment, and may include other processes, and the aging
process for forming an oxide film on the surface of the metal film is also described above. It may
be treated at a different temperature and time than in the embodiment.
[0060]
FIG. 8 is a graph showing the on-axis 1 m sound pressure when a sine wave signal of about 1 kHz
is input to the ring type speaker 1 of this embodiment, and is a frequency graph showing the
level of second-order or higher harmonic distortion. . FIG. 8A shows the case of the ring type
speaker 1 using the ring diaphragm 3 of the first embodiment, and FIG. 8B shows the case of the
sixth embodiment. In the case of the ring-type speaker 1 of the sixth embodiment of the present
invention, it is understood that higher-order harmonic distortion is reduced as compared with the
case of the first embodiment. As described above, the ring-type speaker 1 of the present
embodiment is excellent in the reproduction sound quality, and the acoustic characteristics can
be improved.
[0061]
In the above-described ring-type speaker of the present invention, the equalizer 2 molded of
resin may be replaced with another material. For example, the equalizer 2 serving also as a
diaphragm fixing member for fixing the fixing portions 3b and 3c of the speaker diaphragm 3 to
the magnetic circuit 10 may be integrally formed with the horn located on the front side of the
diaphragm portion 3a. Also, separately configured parts may be connected.
[0062]
The speaker diaphragms according to the first to fifth embodiments are the case of the ring
diaphragm 3 having the outer peripheral edge 3d and the inner peripheral edge 3e on the outer
periphery and the inner periphery of the diaphragm portion 3a, respectively. The speaker
diaphragm is a dome-shaped diaphragm including a fixed portion fixed to the magnetic circuit on
the outer periphery of the dome-shaped diaphragm portion 3a and an edge portion defined
between the diaphragm portion and the fixed portion. May be In the case of a speaker diaphragm
in which a plain woven fabric coated with a thermoplastic resin is integrally formed by heat press
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molding using a plain woven fabric as a substrate, the second laminated structure constituting
the edge portion is formed by melting the coated thermoplastic resin. The warp of the woven
fabric and the space between the weft and the weft are cured to form a thinner shape as
compared to the first laminated structure of the diaphragm portion and the fixing portion. Similar
to the ring speaker, the reproduction frequency band of the dome speaker can be broadened, and
the acoustic characteristics can be improved.
[0063]
The speaker diaphragm of the present invention is not limited to the tweeter for high-range
reproduction, and can be applied to a full range speaker and other speakers for middle-low range
reproduction.
[0064]
It is a figure explaining ring type speaker 1 by a desirable embodiment of the present invention.
(Example 1) FIG. 5 is a view for explaining a ring diaphragm 3 of a ring type speaker 1 according
to a preferred embodiment of the present invention and a voice coil 4 connected thereto.
(Example 1) It is an enlarged photograph explaining the appearance of the cloth surface of the
ring diaphragm 3 of Example 1 according to a preferred embodiment of the present invention.
(Example 1) It is a figure explaining the ring diaphragm 30 of a prior art example, and the voice
coil 4 connected with this. It is an enlarged photograph explaining the mode of the cloth surface
of the ring diaphragm 3 of Example 1 which is (comparative example 1). (Comparative example
1) It is a graph showing the on-axis 1 m sound pressure frequency characteristic of the ring type
speaker of this invention. (Examples 1-4) It is a graph showing the on-axis 1 m sound pressure
frequency characteristic of the conventional ring type speaker. (Comparative example 1, 2) It is a
graph which shows the level of the harmonic distortion of the ring type speaker of this invention.
(Example 1, Example 6)
Explanation of sign
[0065]
DESCRIPTION OF SYMBOLS 1 ring type speaker 2 equalizer 3 ring diaphragm 4 voice coil 5
bobbin 6 coil 10 magnetic circuit 11 yoke 12 magnet 13 plate 20 radiation hole 21 inner
peripheral part 22 outer peripheral part 23 connecting arm part
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