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JP2010057093

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DESCRIPTION JP2010057093
PROBLEM TO BE SOLVED: To provide a speaker diaphragm and an electrodynamic speaker
which are transparent glass speaker diaphragms and excellent in reproduction sound quality
with few peak dips on sound pressure frequency characteristics. A speaker diaphragm made of a
transparent glass, wherein the glass is a heat-resistant glass made of at least silica sand, sand
borax, boric acid, alumina, and sodium chloride, and a concave surface and a convex surface
opposite to the concave surface. And a substantially spherical shell-like transparent diaphragm
portion. Preferably, in the speaker diaphragm of the present invention, the concave or convex
surface of the transparent diaphragm portion is defined as part of a spherical shell having a
radius of about 30.0 mm to about 150.0 mm, and the thickness of the transparent diaphragm
portion is , Approximately 0.3 mm to 1.2 mm. [Selected figure] Figure 2
Speaker diaphragm and electrodynamic speaker using the same
[0001]
The present invention relates to a transparent glass speaker diaphragm and a speaker using the
same, and more particularly to a speaker diaphragm comprising a heat-resistant glass substrate
and a substantially spherical shell-like transparent diaphragm portion including a concave
surface and a convex surface.
[0002]
In the electrodynamic speaker, a flat loudspeaker diaphragm or a nonplanar loudspeaker
diaphragm (typically, a cone diaphragm or a dome diaphragm) is used.
10-05-2019
1
As the material, for example, various materials such as paper made of paper, metal, resin, or one
obtained by impregnating a base material with a thermosetting resin and thermosetting it may be
used. The material of the speaker diaphragm affects the characteristics of the sound reproduced
from the electrodynamic speaker and produces an inherent tone, so even though the diaphragm
area is large, the specific gravity is light, the specific gravity is light, the elastic modulus is high,
and the internal It is desirable to have a loss. In addition, when the area of the diaphragm
increases, divided vibrations tend to occur at low frequencies. Therefore, it is desirable to
improve the rigidity by devising not only the material of the speaker diaphragm but also the
shape.
[0003]
Conventionally, there is a moving coil type dynamic speaker, which is characterized in that a
glass plate having a thickness of 0.2 mm or more and 20 mm or less is used as a diaphragm
(Patent Document 1). Specifically, the glass plate of this patent document 1 is oxide glass such as
borosilicate glass, soda lime glass, potash glass, lead glass, quartz glass, special hard glass,
aluminosilicate glass, borate glass, It includes phosphate glass, aluminate and titanate glass,
fluoride glass, chalcogen glass, metallic glass and polycrystalline glass. Further, as for the shape
of the glass diaphragm of Patent Document 1, the whole may be a plane, may be a plane
including a partial curved surface, or may be a curved surface such as a cone shape or a dome
shape. For the perimeter of, it is supposed that rectangular, square, circle, oval, triangle, polygon
with pentagon or more and any other shape are acceptable.
[0004]
Also, there is a conventional speaker diaphragm formed by forming a porous inorganic glass
foam having independent or open cells (Patent Document 2). In the inorganic glass foam of
Patent Document 2, a fine powder of an inorganic glass is uniformly mixed with a foaming agent
such as carbon or calcium carbonate, and these are mixed in a mold made of a heat resistant
metal and a heat resistant material in a furnace. A speaker using this inorganic glass speaker
diaphragm has less distortion and is flatter to a higher frequency in the sound pressure
frequency characteristics, as heat treatment and foaming followed by precooling to normal
temperature. It can be played back.
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2
[0005]
JP-A-5-227590 (FIG. 1) JP-A-54-37722 (FIGS. 1-2)
[0006]
However, conventionally, a speaker using glass as a speaker diaphragm, including the speaker of
Patent Document 1 or 2, has hardly been put to practical use.
Glass has a large specific gravity, so the weight of the speaker diaphragm is heavy and the
efficiency of the speaker is low, so it is rarely used for the speaker diaphragm. Moreover, since
the speaker diaphragm of glass has a large Young's modulus and a small internal loss, a
remarkable treble vibration mode tends to be generated, and as a result, a peak dip appears in
the sound pressure frequency characteristic and the reproduction is performed. There is a
problem that the sound quality may be degraded. In addition, if the glass with a large specific
gravity is light and thin so as to be suitable for the speaker diaphragm, it is fragile and not
practical in the case of a flat surface. On the other hand, even when trying to form a non-planar
shape such as a cone shape There is a problem that it is difficult to produce a thin speaker
diaphragm.
[0007]
The present invention has been made to solve the above-mentioned problems of the prior art,
and the object thereof is a transparent glass speaker diaphragm, which has a low reproduction of
reproduction sound with a small peak dip in sound pressure frequency characteristics. To
provide an excellent speaker diaphragm and an electrodynamic speaker.
[0008]
The speaker diaphragm of the present invention is a speaker diaphragm having a transparent
glass as a base material, wherein the glass is a heat-resistant glass made of at least silica sand,
borax, boric acid, alumina, and sodium chloride, and a concave surface and its surface A
substantially spherical shell-like transparent diaphragm portion including an opposite convex
surface is provided.
[0009]
Preferably, in the speaker diaphragm of the present invention, the concave or convex surface of
the transparent diaphragm portion is defined as part of a spherical shell having a radius of about
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30.0 mm to about 150.0 mm, and the thickness of the transparent diaphragm portion is ,
Approximately 0.3 mm to 1.2 mm.
[0010]
Preferably, in the speaker diaphragm of the present invention, the concave or convex surface of
the transparent diaphragm portion is defined as part of a spherical shell having a radius of about
30.0 mm to about 150.0 mm, and the thickness of the transparent diaphragm portion is In the
range of 0.3 mm to 1.2 mm, it is formed to be thinner from the center to the outer peripheral
edge.
[0011]
In addition, preferably, the speaker diaphragm of the present invention further includes a
mounting portion formed substantially at the center of the transparent diaphragm portion so as
to project from the base material and engaged with the voice coil bobbin.
[0012]
In addition, preferably, the electrodynamic speaker according to the present invention includes
the above-described speaker diaphragm, an edge fixed to the outer peripheral edge of the
speaker diaphragm, a voice coil bobbin mounted substantially at the center of the speaker
diaphragm, and a voice coil bobbin And a magnetic circuit having a magnetic gap for arranging
the coil, a damper fixed to the voice coil bobbin, an edge, a damper, and a frame connected to the
magnetic circuit.
[0013]
Hereinafter, the operation of the present invention will be described.
[0014]
The speaker diaphragm of the present invention is a speaker diaphragm using a transparent
glass as a base material, and the glass is a heat-resistant glass whose raw material is at least silica
sand, borax, boric acid, alumina and sodium chloride.
The heat resistant glass has a characteristic of being resistant to a rapid temperature change
because it has less expansion due to heat as compared with soda lime glass whose main raw
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4
material is silica sand, lime, soda ash or the like.
The heat-resistant glass has high viscosity at the time of molding, can be thinly processed by
blow molding, and is also superior to cutting in the next step.
In addition, heat-resistant glass is generally smaller in specific gravity compared to soda lime
glass, crystal glass, etc., and has a low expansion coefficient and is stable, so it is suitable for use
as a speaker diaphragm.
[0015]
The speaker diaphragm of the heat-resistant glass is provided with a substantially spherical shelllike transparent diaphragm portion including a concave surface on the front side and a convex
surface on the rear side.
That is, the speaker diaphragm of the present invention is not a flat plate glass, but is a speaker
diaphragm having a cone-shaped or dome-shaped transparent diaphragm portion made of heatresistant glass.
Because the heat-resistant glass speaker diaphragm is transparent, the electrodynamic speaker
according to the present invention sees through components located on the back side which can
not be seen from the outside with a normal speaker diaphragm such as a voice coil, a magnetic
circuit, and a damper. can do.
The thickness of the transparent diaphragm portion made of heat-resistant glass is in the range
of 0.3 mm to 1.2 mm. Therefore, when configured as an electrodynamic speaker, for example,
the front surface on the listener side becomes concave and the voice The opposite back surface
on which the coil or magnetic circuit is disposed is a convex surface.
[0016]
The above-mentioned is suitable for a speaker diaphragm by defining a concave surface or a
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5
convex surface of the transparent diaphragm portion as a part of a spherical shell having a radius
of about 30.0 mm to about 150.0 mm and blow-molding a heat resistant glass by blow molding.
The thickness of the spherical shell changes as it goes from the center to the outer periphery,
and it can be processed into a shape obtained by cutting out a part of a spherical shell having
high rigidity.
The thickness of the transparent diaphragm portion of the heat resistant glass can be
substantially uniformly thin in the range of 0.3 mm to 1.2 mm by forming a part of the spherical
shell by blow molding, so the speaker diaphragm of the heat resistant glass of the present
invention The electrodynamic speaker provided with the present invention can realize a high
reproduction sound pressure level as compared to the case of the conventional flat glass or the
case of the common glass having a large thickness.
[0017]
When the thickness of the concave surface or convex surface of the transparent diaphragm
portion of the speaker diaphragm of the present invention is formed to be thinner from the
center portion toward the outer peripheral edge in the range of 0.3 mm to 1.2 mm, The
approximate center of the speaker diaphragm is strengthened more than the outer peripheral
edge. As a result, since the rigidity around the voice coil bobbin that generates the driving force
by being supplied with the audio signal is further strengthened, the divided vibration is
suppressed, and flat sound pressure frequency characteristics and low harmonic distortion are
realized. . In addition, as the diaphragm portion becomes thinner toward the outer peripheral
edge, the weight of the speaker diaphragm can be further reduced, and a high reproduction
sound pressure level can be achieved even with an electrodynamic speaker using glass as the
speaker diaphragm. It can be realized.
[0018]
Alternatively, in the case where a mounting portion is formed substantially at the center of the
transparent diaphragm portion so as to protrude concentrically with the outer diameter or the
inner diameter by heat-resistant glass and the voice coil bobbin engages, as in the above case.
The rigidity around the voice coil bobbin is further strengthened to suppress split vibration, and
flat sound pressure frequency characteristics are realized. When the mounting portion made of
the same base material and made of heat-resistant glass is provided, the high-order resonance
mode becomes dispersive, and the frequency characteristic that tends to exhibit a high peak
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becomes smooth. Furthermore, since the position where the voice coil bobbin is engaged is
uniquely determined in the manufacturing process of the electrodynamic speaker, the adhesive
strength between the speaker diaphragm and the voice coil is high, the transmission loss is
reduced, and the S / N ratio is It is possible to realize a speaker that can be improved.
[0019]
According to the speaker diaphragm of the present invention, even if it is a transparent glass
speaker diaphragm, it is possible to widen a flat frequency range with less peak and dip on sound
pressure frequency characteristics, less harmonic distortion, and reproduction sound quality
Speaker diaphragm and electrodynamic speaker can be realized.
[0020]
The speaker diaphragm of the present invention and the electrodynamic speaker using the same
can widen a flat frequency range with less peak dip on sound pressure frequency characteristics
even with a transparent glass speaker diaphragm. A speaker diaphragm made of a transparent
glass as a base material for the purpose of realizing a speaker diaphragm and an electrodynamic
speaker having less harmonic distortion and excellent reproduction sound quality, wherein the
glass is at least silica sand, borax, This is realized by providing a substantially spherical shell-like
transparent diaphragm portion which is a heat-resistant glass made of oxalic acid, alumina and
sodium chloride and including a concave surface and a convex surface on the opposite side
thereof.
[0021]
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.
[0022]
FIG. 1 is a schematic cross-sectional view of a speaker 1 according to a preferred embodiment of
the present invention.
The speaker 1 has a speaker diaphragm 5, a voice coil bobbin 2 bonded to the speaker
diaphragm 5, and a voice coil 3 wound around the lower end of the voice coil bobbin 2.
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The voice coil 3 is disposed in the magnetic gap of the magnetic circuit 4, vibrates with a driving
force generated according to the input audio signal, and drives the speaker diaphragm 5 by
displacing the inside of the magnetic gap.
The vibration system formed by the speaker diaphragm 5 and the voice coil bobbin 2 is
vibratably supported in the illustrated Z direction by the edge 6 and the damper 7. The edge 6
and the outer peripheral side of the damper 7 are fixed to a frame 8 connected to the magnetic
circuit 4. When the speaker diaphragm 5 vibrates, sound waves as compression waves are
generated in the air, and as a result, the sound is reproduced from the speaker 1.
[0023]
The magnetic circuit 4 of the present embodiment is an external magnet type magnetic circuit
provided with a pole, a plate and a magnet, and is provided with a cancel magnet and a cover 9
covering the magnetic circuit. Further, an audio signal is supplied to the voice coil 3 via a
terminal (not shown) and a tinsel wire 10 (not shown). The substantially spherical concave 5 a
side of the speaker diaphragm 5 is the front side of the speaker 1, and the voice coil bobbin 2,
the voice coil 3, the magnetic circuit 4, and the damper 7 are on the substantially spherical
convex 5 b side on the back side. And the tinsel wire 10 are arranged. The magnetic circuit 4
may be another internal magnet type magnetic circuit, a repulsive magnetic circuit, or the like.
[0024]
FIG. 2 is a perspective view of the speaker 1 of the present embodiment as viewed obliquely from
the front. As will be described later, the speaker diaphragm 5 is a speaker diaphragm using a
transparent heat-resistant glass as a base material. Therefore, in the speaker 1, as shown in FIG.
2, the voice coil bobbin 2 located on the back side of the speaker diaphragm 5, the voice coil 3,
the center pole of the magnetic circuit 4, the damper 7, and the tinsel wire 10 The transparent
speaker diaphragm 5 is seen through from the front. The speaker 1 of the present embodiment is
an electrodynamic speaker having a diameter of about 10 cm.
[0025]
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8
In the speaker 1 of the present embodiment, a speaker diaphragm (not shown) of the
comparative example having a substantially spherical shell-like speaker diaphragm of the same
shape (not shown) is made of a transparent heat-resistant glass speaker diaphragm. It is a
speaker replaced with five. For example, in the speaker diaphragm of the comparative example, a
thermosetting resin is impregnated in the base material, the base material is a laminate including
a natural fiber woven layer and a natural fiber non-woven layer, and the thermosetting resin is
Any suitable thermosetting resin such as unsaturated polyester may be employed. That is, in the
speaker 1 of this embodiment, the components other than the transparent heat-resistant glass
speaker diaphragm 5 can commonly use the components of the conventional electrodynamic
speaker.
[0026]
FIG. 3 is a view for explaining the speaker diaphragm 5 of the present embodiment which
constitutes the speaker 1. FIG. 3A is a plan view of the substantially spherical shell shaped
speaker diaphragm 5 viewed from the side of the concave surface 5a which is a front surface,
and FIG. 3B is a cross-sectional view of the speaker diaphragm 5. It is A 'sectional drawing. The
speaker diaphragm 5 has a transparent diaphragm portion 5s substantially circular in plan view
defined as a part of a large radius spherical shell. The transparent diaphragm portion 5s includes
a concave surface 5a on the front side, a convex surface 5b on the rear side corresponding to the
concave surface 5a, and an outer peripheral edge 5c defining an outer diameter thereof. In the
speaker diaphragm 5 of the present embodiment, the radius rc from the center point O to the
outer peripheral edge 5c is about 39.5 mm, and the total height hc of the transparent diaphragm
5s is about 21.6 mm.
[0027]
The transparent diaphragm portion 5s of the speaker diaphragm 5 is made of transparent heatresistant glass as a base material, so the thickness of the transparent diaphragm portion 5s of the
present embodiment is about 0.45 mm to about 1.00 mm throughout the whole. In the range of
approximately uniformly thin. In the speaker diaphragm 5 of the present embodiment, the radius
ra defining the concave surface 5a of the transparent diaphragm portion 5s is about 45.6 mm
with the point on the Z axis passing through the central point O as the central point, and the
transparent diaphragm portion The radius rb defining the convex surface 5b of 5s is about 45.6
mm. Therefore, as shown in FIG. 3, the thickness t of the transparent diaphragm portion 5s
becomes thinner as it goes from the central portion to the outer peripheral portion 5c.
Specifically, while the thickness t at the central portion is approximately 0.60 mm, the thickness t
10-05-2019
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is approximately 0.46 mm at a portion having a radius of approximately 28.0 mm from the
central point O near the outer peripheral portion 5c. It is formed to be The thickness t is about
0.3 mm at the outermost peripheral edge 5c which is the thinnest. The weight of the speaker
diaphragm 5 of this embodiment is about 11.5 g.
[0028]
The speaker diaphragm 5 is a speaker diaphragm using a heat-resistant glass as a base material,
and is formed using at least silica sand, borax, boric acid, alumina, and sodium chloride as raw
materials. Heat resistant glass has less expansion due to heat compared with soda lime glass
mainly made of silica sand, lime, soda ash etc., so it is resistant to rapid temperature changes and
generally soda lime glass or crystal glass It has the characteristic that specific gravity is small
compared with etc. The heat-resistant glass has high viscosity at the time of molding, and can be
thinly processed into the shape of a speaker diaphragm including a substantially spherical
concave and convex surface by blow molding, and is also superior in the process of cutting at the
position of the outer peripheral edge 5c It is. In addition, since the heat resistant glass can be
made thinner, the overall weight of the speaker diaphragm 5 can be further reduced, so that the
heat resistant glass is more suitable for use as a speaker diaphragm than conventional soda lime
glass.
[0029]
Further, in the speaker diaphragm 5 of the present embodiment, the main compositions of the
heat-resistant glass formed using silica sand, borax, boric acid, alumina, and sodium chloride as a
raw material are as follows. SiO 2 about 81% Al 2 O 3 about 2% B 2 O 3 about 13% Na 2 O about
4%
[0030]
Further, as a comparative example, as shown in FIG. 4B, a transparent soda-lime glass speaker
diaphragm 50 having concave and convex surfaces of substantially the same shape was formed.
The main composition of soda lime glass (normal glass) mainly composed of silica sand, lime,
soda ash and the like is as follows. SiO2 about 71% Al2O3 about 2% B2O3 about 2% Na2O about
17% CaO about 5%
10-05-2019
10
[0031]
FIG. 4 is a view for explaining the speaker diaphragm 5 of the present embodiment and a view
for explaining the speaker diaphragm 50 of the comparative example. That is, FIG. 4 (a) is a
photograph of the speaker diaphragm 5 of a transparent heat-resistant glass having a concave
surface and a convex surface, while FIG. 4 (b) is a transparent soda lime having a concave surface
and a convex surface having substantially the same shape. It is a photograph of the speaker
diaphragm 50 of glass. Loudspeaker diaphragms 5 and 50 are formed by blow molding of glass,
which is the base material of each, as a part of spherical shell by blow molding, and a part
thereof is defined on outer peripheral edge 5 c defined on one plane. The entire shape is formed
by cutting processing to have.
[0032]
However, since the speaker diaphragm 5 of the present embodiment shown in FIG. 4A is based
on a heat-resistant glass having tenacity, it is substantially uniformly thin and lightweight in a
range of about 0.7 mm to about 1.00 mm. And the speaker diaphragm which is excellent in
rigidity which an outer peripheral edge part does not chip easily can be formed. Within the range
of this thickness, in the case of the speaker diaphragm 5 of the present embodiment, in the step
of forming the shape of the 32 speaker diaphragms 5 by blow molding and cutting the outer
peripheral edge, It was possible to obtain 30 non-defective speaker diaphragms 5 without
deformation or chipping.
[0033]
On the other hand, the speaker diaphragm 50 of the comparative example shown in FIG. 4B uses
soda lime glass called parallel glass as a base material, so it is difficult to form a diaphragm of the
same thinness in itself, and manufacture There is a problem that many are broken in the process.
In the process of shaping and cutting the shape of the ten speaker diaphragms 50 by blow
molding, it is only possible to obtain one non-defective speaker diaphragm 5 without deformation
or chipping of the outer peripheral edge portion. In the speaker diaphragm 50 of FIG. 4B, a part
of the outer peripheral edge portion is broken to form a missing portion 51 (shown). The
thickness of the diaphragm that can be obtained as the speaker diaphragm 50 of the comparative
example is about 0.50 mm.
10-05-2019
11
[0034]
FIG. 5 is a graph showing sound pressure frequency characteristics, sound pressure second-order
and third harmonic distortion characteristics, and admittance characteristics of the speakers of
the present embodiment and the comparative example. Specifically, FIG. 5A is a case of the
speaker 1 of the present embodiment using the speaker diaphragm 5 of the present embodiment,
and FIG. 5B is a comparison of using the speaker diaphragm 50 of the comparative example. This
is the case of an example speaker (not shown). In the speaker 1 of the present example and the
speaker of the comparative example, components other than the speaker diaphragm of the
comparison target and the adhesive all have the same specifications.
[0035]
In the speaker 1 of the present embodiment and the speaker of the comparative example, since
the thickness and weight of the speaker diaphragm are almost the same, the lowest resonance
frequency f0, resonance sharpness Q0, reproduced sound pressure level, etc. The constants of
the speaker as a basic one-degree-of-freedom vibration system do not differ much. However, in
the case of the speaker 1 using the speaker diaphragm 5 of the present embodiment having the
heat resistant glass as a base material, the rigidity of the transparent diaphragm portion 5s is
higher than that of the speaker diaphragm 50 of the comparative example. It has been realized.
Specifically, the level of harmonic distortion in the low frequency range (about 60 Hz to 200 Hz)
is lower in the speaker 1 using the speaker diaphragm 5 of the present embodiment, and divided
vibration in the high frequency range (about 6 kHz to 20 kHz) At the peak due to the resonance
sharpness Q is low.
[0036]
Therefore, there is also a difference in the sound to be reproduced, and the speaker 1 using the
speaker diaphragm 5 of the present embodiment has a higher resolution and an excellent
reproduction sound quality. When transparent glass is used for the speaker diaphragm, there is a
problem that the inherent resonance sound unique to the glass is difficult to attenuate. However,
in the speaker 1 using the speaker diaphragm 5 of the present embodiment using heat-resistant
glass as a base material , There is little sounding peculiar to the glass diaphragm, and although
the weight increase of the speaker diaphragm can not be denied, its shape is almost the same as
that of the conventional speaker diaphragm, so it is similar to the other ordinary speakers It can
10-05-2019
12
be used for reproduction. In the first place, it is difficult to form a soda-lime glass-based speaker
diaphragm as a substantially spherical shell having a very thin thickness and having a concave
surface and a convex surface, as in the present embodiment. It is advantageous to form with
heat-resistant glass.
[0037]
Moreover, although the speaker diaphragm 5 of the present embodiment is formed so that the
thickness of the transparent diaphragm portion 5s becomes thinner toward the outer peripheral
portion 5c from the central portion, the thickness of the transparent diaphragm portion 5s is It
may be formed substantially uniformly in the range of 0.3 mm to 1.2 mm. When it is formed so
as to become thinner toward the outer peripheral portion 5c from the central portion, the
approximate center of the speaker diaphragm 5 is strengthened more than the outer peripheral
portion 5c, and an audio signal is supplied to generate a driving force. The rigidity around the
voice coil bobbin is further enhanced. On the other hand, when the external dimension of the
speaker diaphragm 5 is small, the diaphragm area is small, and there is a problem that it is
desired to further reduce the weight and secure the sound pressure reproduction level. But there
is a case to make it even thinner. Therefore, it is possible to further reduce the weight of the
speaker diaphragm, and to realize a high reproduction sound pressure level even with an
electrodynamic speaker using glass as the speaker diaphragm.
[0038]
FIG. 6 is a view for explaining the speaker diaphragm 11 according to another embodiment, and
including the voice coil bobbin 2 and the coil 3 fixed to the speaker diaphragm 11, these are
partially cut away when viewed from the rear side. It is a disassembled perspective view. The
speaker diaphragm 11 of the present embodiment is, like the speaker diaphragm 5 of the
previous embodiment, a transparent speaker diaphragm using a heat-resistant glass as a base
material. The speaker diaphragm 11 has a transparent diaphragm portion 11s having a
substantially circular front view and defined as a part of a large radius spherical shell, and the
transparent diaphragm portion 11s has a concave surface 11a on the front side, A corresponding
back side convex surface 11b and an outer peripheral edge 11c defining the outer diameter
thereof are included, and on the convex surface 11b side, a mounting portion 11d formed to
project and engaged with the voice coil bobbin 2 is provided. Further equipped.
[0039]
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The mounting portion 11d is formed substantially at the center of the transparent diaphragm
portion 11s so as to project from the heat resistant glass base to the back side concentrically
with the outer diameter or the inner diameter, and the coil 3 of the voice coil bobbin 2 is wound.
Engage so as to fit in the inner diameter side of the one end side which is not. For example, with
respect to the thickness of about 0.5 mm of the transparent diaphragm part 11s, the mounting
part 11d forms a ring-shaped convex part which protrudes about 0.5 mm from the convex face
11b. Therefore, in the electrodynamic speaker (not shown) using the speaker diaphragm 11 of
the present embodiment, the rigidity around the voice coil bobbin 2 fixed with the adhesive is
further strengthened to suppress the division vibration, and is smoother. Sound pressure
frequency characteristics are realized.
[0040]
Further, in the electrodynamic speaker using the speaker diaphragm 11 of the present
embodiment, since the mounting portion 11 d is provided to project from the convex surface 11
b in the manufacturing process, the position where the voice coil bobbin 2 engages with the
speaker diaphragm 11 Is uniquely determined, and the variation in the manufacturing process is
reduced. And the adhesive strength of the speaker diaphragm 2 and the voice coil bobbin 2 is
high, and it can implement | achieve the speaker which can reduce a transmission loss and can
improve S / N ratio.
[0041]
In addition, the attaching part 11d which protrudes from the base material of heat-resistant glass
is not limited to such a ring-shaped shape. It may be a plurality of projections or ribs protruding
from the base of the transparent heat-resistant glass and arranged concentrically so as to be able
to determine the position where the voice coil bobbin 2 is engaged. The mounting portion 11 d is
provided with a concave shape corresponding to the shape of the mounting portion 11 d in a
mold used when blow molding the substantially spherical shell-like transparent diaphragm
portion 11 s having heat resistant glass as a base material. The projections can be formed
concentrically.
[0042]
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14
Although the preferred embodiments of the present invention have been described, the present
invention is not limited to these embodiments. The thickness of the transparent diaphragm is 0.3
mm to 1.2 mm for the first time by using heat-resistant glass as a base material and forming the
shape as a part of a spherical shell with a large radius including a concave surface and a convex
surface. An extremely thin speaker diaphragm can be realized in the range. The radius of the
spherical surface of about 30.0 mm to about 150.0 mm defining the concave surface and the
convex surface is not limited to the case of a single arc, and a composite arc cone shape formed
by connecting a plurality of arcs. , Including the radius that specifies each arc. In this case, the
vibration mode can be dispersed, and the peak dip on the sound pressure frequency
characteristic can be further reduced.
[0043]
The speaker diaphragm 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 playing particularly in the low frequency range or a tweeter playing in the high frequency
range. Moreover, the speaker diaphragm of this invention is applicable not only to a speaker but
to headphones and a microphone provided with a diaphragm.
[0044]
1 is a schematic cross-sectional view of a speaker 1 according to a preferred embodiment of the
present invention. (Example 1) FIG. 1 is a perspective view of a speaker 1 of an example
according to a preferred embodiment of the present invention as viewed obliquely from the front.
(Example 1) It is a figure explaining the speaker diaphragm 5 of the present Example which
comprises the speaker 1 by preferable embodiment of this invention. (Example 1) A diagram for
explaining the speaker diaphragm 5 according to a preferred embodiment of the present
invention and a diagram for explaining the speaker diaphragm 50 of the comparative example.
(Example 1) A graph showing sound pressure frequency characteristics, sound pressure secondorder, third harmonic distortion characteristics, and admittance characteristics of the speakers of
the present embodiment and the comparative example. (Example 1) It is a figure explaining the
speaker diaphragm 11 of the other Example of this invention. (Example 2)
Explanation of sign
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[0045]
Reference Signs List 1 speaker 2 voice coil bobbin 3 voice coil 4 magnetic circuit 5 speaker
diaphragm 5s transparent diaphragm 5a concave 5b convex 5c outer peripheral edge 6 edge 7
damper 8 frame 9 cover 10 tinsel wire 11 speaker diaphragm 11s transparent diaphragm 11a
concave 11b convex surface 11c outer peripheral edge portion 11d mounting portion
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