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JPH06284498

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH06284498
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device, and more particularly to a speaker device having an acoustic diaphragm and a
bobbin around which a voice coil as a driving coil is wound.
[0002]
2. Description of the Related Art In a so-called electrodynamic speaker device comprising a voice
coil bobbin on which an acoustic diaphragm and a drive coil are wound, the drive coil is
magnetically connected to a magnetic circuit made of a magnet, a magnetic material, etc. And in a
uniform magnetic field. For this reason, when an acoustic current flows through the drive coil,
the voice coil bobbin vibrates, and this vibration is transmitted to the acoustic diaphragm to
output reproduced sound based on the acoustic signal.
[0003]
As the above-mentioned acoustic diaphragm, a cone shape cone shape for middle bass range, a
hemispherical dome shape for high range, etc. are generally used. The low frequency range
acoustic diaphragm is mainly formed of paper, polymer material, aluminum or the like, and the
high frequency range acoustic diaphragm is mainly formed of paper, polymer material film, cloth,
metal material or the like. . In addition, these acoustic diaphragms are connected to a drive coil
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and a voice coil bobbin around which a voice coil is wound, and in the case of the abovementioned cone type acoustic diaphragm, the apex of the cone of the acoustic diaphragm is an
opening. The voice coil bobbin is fixed by an adhesive. On the other hand, in the case of the
dome-shaped acoustic diaphragm, the voice coil bobbin is fixed to the opening of the hemisphere
of the acoustic diaphragm by an adhesive. The voice coil bobbin is usually made of paper,
aluminum or the like.
[0004]
As described above, in the electrodynamic speaker device, the voice coil bobbin vibrates due to a
change in acoustic current flowing through the drive coil, and this vibration is transmitted to the
acoustic diaphragm. For this reason, as a material for forming the voice coil bobbin, a material
that is lightweight and highly rigid is preferable. The voice coil bobbin is usually made of paper,
aluminum or the like. However, when the voice coil bobbin is formed of paper, since the Young's
modulus of the paper is about 1.5 to 2 GPa, the rigidity is low, and it is difficult to sufficiently
transmit the vibration to the acoustic diaphragm. On the other hand, when the voice coil bobbin
is formed of aluminum, the conductivity of the aluminum causes an eddy current to be generated
in the voice coil bobbin, which hinders faithful reproduction. In recent years, it has also been
proposed to use a polymer material as the material for forming the voice coil bobbin, but also in
this case, it is difficult to sufficiently transmit the vibration to the acoustic diaphragm because the
rigidity of the polymer material itself is low. It is. In addition, in a metal such as aluminum or a
polymer material, the resonance sharpness Q is high, and sufficient acoustic characteristics can
not be obtained.
[0005]
Therefore, the present invention has been proposed in view of the conventional situation, and
provides a bobbin which is light in weight, high in rigidity, small in conductivity, low in
resonance sharpness Q, and driven on an acoustic diaphragm generated in the bobbin. A speaker
device in which the force is sufficiently transmitted to the acoustic diaphragm, an abnormal
sound peculiar to the bobbin forming material is less likely to be generated, good acoustic
characteristics in a wide range from low to high, and high fidelity reproduction possible. Intended
to be provided.
[0006]
SUMMARY OF THE INVENTION As a result of intensive studies by the present inventors to
achieve the above-mentioned object, at least a bobbin of the above-mentioned speaker device is
disclosed in Japanese Patent Application Laid-Open No. 61-281800 or US Pat. When made of
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cellulose produced by culture with microorganisms (so-called bacterial culture) as shown in 742,
164, the above-mentioned bobbin is light in weight, high in rigidity, small in conductivity, and
low in resonance sharpness Q. From the above, it has been found that it is possible to form a
speaker device that has good acoustic characteristics in a wide region of high tone and enables
high fidelity reproduction.
[0007]
That is, according to a first aspect of the present invention, there is provided a speaker device
comprising an acoustic diaphragm, a bobbin connected to the acoustic diaphragm, a voice coil
wound around the bobbin, and a magnetic circuit disposed at a position facing the voice coil. At
least the bobbin is characterized by being formed of cellulose produced by bacterial culture.
[0008]
In the first invention, the cellulose may be α-cellulose, and the cellulose may be produced by a
microorganism belonging to any of Acetobacter, Pseudomonas, and Agrobacterium.
[0009]
In the first invention, the acoustic diaphragm may be formed of cellulose produced by bacterial
culture.
[0010]
Furthermore, in the first invention, the second diaphragm material may be stacked on the
acoustic diaphragm.
[0011]
The second invention is a speaker device including an acoustic diaphragm having a diaphragm
portion and a bobbin portion, a voice coil wound around the bobbin portion, and a magnetic
circuit disposed at a position facing the voice coil. The vibrating plate portion and the bobbin
portion are integrally formed of cellulose produced by bacterial culture.
[0012]
In the second invention, the cellulose may be α-cellulose, and the cellulose may be produced by
a microorganism belonging to any of Acetobacter, Pseudomonas and Agrobacterium.
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[0013]
Furthermore, in the second invention, the second diaphragm material may be laminated on the
diaphragm portion.
[0014]
Cellulose produced by bacterial culture is composed of highly crystalline α-cellulose, and has
extremely high strength due to its very strong surface orientation.
In addition, its thickness is extremely fine, 0.02 to 0.04 μm.
In addition, although the Young's modulus of this cellulose changes with the manufacturing
methods, it has a Young's modulus of 5-20 GPa or more, The resonance sharpness Q is
comparable as paper.
[0015]
And, as a microorganism producing the above-mentioned cellulose, acetic acid bacteria are
typical, and Acetobacter aceti (Acetobacter aceti), Acetobacter xylinum (Acetobacter xylinum),
Acetobacter lansense (Acetobacter rancens), Zartina bentonikuri (Acetobacter rancins) Sarcina
ventriculi), Bacterium xyloides, Acetobacter pasteurianus, Agrobacterium tumefaciens, etc., and,
further, Pseudomonas (Pseudomonas), Rhizobium (Rhizobium) It can be mentioned.
Among these, Acetobacter, Pseudomonas, and Agrobacterium are more preferable.
The above-mentioned cellulose can be obtained by a method of producing it as a gel-like
substance having a certain thickness at the interface between the culture medium and air,
aeration and agitation culture method and the like.
[0016]
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According to a first aspect of the present invention, there is provided a speaker device
comprising an acoustic diaphragm, a bobbin connected to the acoustic diaphragm, a voice coil
wound around the bobbin, and a magnetic circuit disposed at a position facing the voice coil. In
the above, at least the bobbin is formed of cellulose produced by bacterial culture, so that the
bobbin is lightweight and highly rigid, and its resonance sharpness Q and conductivity are low.
Therefore, the vibration generated in the bobbin is sufficiently transmitted to the acoustic
diaphragm, and the abnormal sound unique to the bobbin forming material is less likely to be
generated.
[0017]
The second invention is a speaker device comprising an acoustic diaphragm having a diaphragm
portion and a bobbin portion, a voice coil wound around the bobbin portion, and a magnetic
circuit disposed at a position facing the voice coil. The diaphragm portion and the bobbin portion
are integrally formed of cellulose produced by bacterial culture, so there is no fixed portion
having different rigidity, and the diaphragm portion which functions as a bobbin and functions as
an acoustic diaphragm Since the parts are made of the same material, the vibration generated on
the bobbin is more accurately transmitted to the acoustic diaphragm.
[0018]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which
the present invention is applied will be described in detail with reference to the drawings.
In this embodiment, an embodiment of a speaker device having a cone-shaped acoustic
diaphragm will be described.
[0019]
The principal part schematic sectional drawing of the speaker apparatus of a present Example is
shown in FIG.
The speaker device according to the present embodiment is wound on a voice coil bobbin 3 and a
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voice coil bobbin 3 which are cylindrical acoustic diaphragms 1 whose apexes are the opening 1a
and cylinders of a size fitted to the opening 1a. A voice coil 4 as a drive coil to be driven and a
magnetic circuit 2 disposed at a position facing the voice coil 4.
[0020]
The acoustic diaphragm 1 and the voice coil bobbin 3 are fixed to each other at the fixing
portions 1b and 3a by an adhesive or the like.
Further, since the voice coil 4 is magnetically connected to the magnetic circuit 2 and is in a
uniform magnetic field, the voice coil bobbin 3 vibrates when a current based on an acoustic
signal flows through the voice coil 4.
As a result, the vibration of the voice coil bobbin 3 is transmitted to the acoustic diaphragm 1,
and the reproduced sound based on the acoustic signal is output.
[0021]
The other end 1c of the acoustic diaphragm 1 is fixed to the edge 5 by the fixing portion 5a, and
the acoustic diaphragm 1 is fixed to the frame 6 fixed on the magnetic circuit 2 in the fixed state
via the edge 5 There is.
A damper 7 is provided between the magnetic circuit 2 and the fixed portion of the acoustic
diaphragm 1 and the voice coil bobbin 3 or the upper end portion of the voice coil bobbin 3.
Therefore, the acoustic diaphragm 1 and the voice coil bobbin 3 are supported by the damper 7
and the edge 5 so as to be capable of vibrating in the vertical direction in FIG.
[0022]
On the other hand, as shown in FIG. 1, the magnetic circuit 2 is composed of a yoke 2a having a
center pole 2b, a permanent magnet 2c and a plate 2d. Then, the upper end side of the center
pole 2b is inserted into the voice coil bobbin 3 disposed in the opening 1a of the acoustic
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diaphragm 1, and the voice coil 4 of the voice coil bobbin 3 is wound between the center pole 2b
and the plate 2d. The part to be inserted is made to be inserted. That is, as described above, the
voice coil 4 is positioned in the DC magnetic field of the magnetic circuit 2.
[0023]
Therefore, when an alternating current based on an acoustic signal is supplied to the voice coil 4,
a driving force is generated, and the voice coil bobbin 3 is vibrated in the vertical direction in FIG.
[0024]
The lower end side of the frame 6 is fixed to the upper surface of the plate 2d, and the frame 6 is
fixed on the magnetic circuit 2 as described above, and one end of the damper 7 is attached on
the frame 6 As described above, the acoustic diaphragm 1 and the voice coil bobbin 3 are
vibratably supported in the vertical direction in FIG.
At this time, the frame 6 is attached on the plate 2 d by a method such as bonding or screwing.
[0025]
The acoustic diaphragm 1 is made of paper, polymer material, aluminum or the like. And, in the
present embodiment, in particular, the voice coil bobbin 3 is formed of cellulose produced by
bacterial culture.
[0026]
Cellulose produced by bacterial culture is composed of highly crystalline α-cellulose, and has
extremely high strength due to its very strong surface orientation. In addition, its thickness is
extremely fine, 0.02 to 0.04 μm. Although the Young's modulus of the cellulose varies
depending on the production method, it has a Young's modulus of 5 to 20 GPa or more, and its
resonance sharpness Q is comparable to that of paper.
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[0027]
And, as a microorganism producing the above-mentioned cellulose, acetic acid bacteria are
typical, and Acetobacter aceti (Acetobacter aceti), Acetobacter xylinum (Acetobacter xylinum),
Acetobacter lansense (Acetobacter rancens), Zartina bentonikuri (Acetobacter rancins) Sarcina
ventriculi), Bacterium xyloides, Acetobacter pasteurianus, Agrobacterium tumefaciens, etc., and,
further, Pseudomonas (Pseudomonas), Rhizobium (Rhizobium) It can be mentioned. Among these,
Acetobacter, Pseudomonas, and Agrobacterium are more preferable. The above-mentioned
cellulose can be obtained by a method of producing it as a gel-like substance having a certain
thickness at the interface between the culture medium and air, aeration and agitation culture
method and the like.
[0028]
That is, in the speaker device of this embodiment, the voice coil bobbin used is lightweight and
highly rigid, and its resonance sharpness Q and conductivity become low. Therefore, in the
speaker device of the present embodiment, the vibration generated in the voice coil bobbin is
sufficiently transmitted to the acoustic diaphragm, and abnormal sound unique to the bobbin
forming material is not easily generated, and good sound is obtained in a wide range from low to
high. It has the characteristics and enables high fidelity reproduction.
[0029]
The voice coil bobbin 3 formed of cellulose as described above is manufactured as follows. First,
cellulose produced by bacteria is beaten or disintegrated and then made into a suspension for
papermaking. Then, the cellulose in suspension is made into a sheet-like member by a paper
making process. Since the sheet-like member after paper making contains water, the sheet-like
member is dried and pressed by a heated press. Then, the press-dried sheet-like member is cut
into an appropriate size to obtain a bobbin material.
[0030]
Next, the above-mentioned bobbin material is wound around a cylindrical winding jig so as to be
cylindrical. Furthermore, the lead wire coated with the adhesive is wound around the bobbin
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material wound around the winding jig. At this time, the bonded portions of the bobbin materials
are bonded together using an adhesive or the like. Next, they are dried by heating. By heating, the
adhesive applied to the surface of the lead is cured to bond the leads to each other and the lead is
attached to the bobbin material. Then, after the heating and drying are completed, the winding
jig is removed and the voice coil bobbin is completed.
[0031]
Embodiment 2 The speaker device as described in Embodiment 1 is also applicable to a speaker
device having a dome-shaped acoustic diaphragm, and an embodiment of such a speaker device
is shown in FIG. The speaker device is mainly wound on a voice coil bobbin 13 and a voice coil
bobbin 13 which are cylindrical bodies of a size that fits the semicircular acoustic diaphragm 11
and the opening 11 a of the acoustic diaphragm 11. It comprises a voice coil 14 as a drive coil.
The acoustic diaphragm 11 and the voice coil bobbin 13 are fixed to each other at the fixing
portions 11b and 13a by an adhesive or the like. The operation state of the speaker device is the
same as that described in the first embodiment, and the voice coil bobbin 13 vibrates due to a
change in current based on an acoustic signal flowing through the voice coil 14. Then, the
vibration generated by the voice coil bobbin 13 is transmitted to the acoustic diaphragm 11, and
the reproduced sound based on the acoustic signal is output.
[0032]
Further, the acoustic diaphragm 11 is fixed to the damper 15 at the fixing portion 15a at the
fixing surface 11c which is the back of the fixing portion 11b. Further, the damper 15 is fixed to
a fixed portion (not shown) of the speaker device, and in the present embodiment as well as the
first embodiment, the acoustic diaphragm 11 and the voice coil bobbin 13 can be vibrated
vertically in the figure.
[0033]
At this time, the acoustic diaphragm 11 is formed of paper, a polymer material film, a cloth, a
metal material or the like. Also in this embodiment, as in the first embodiment, the voice coil
bobbin 13 is formed of cellulose produced by bacterial culture.
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[0034]
Then, in order to confirm the effect of Example 1 and Example 2, the following experiments were
conducted. That is, when the voice coil bobbin was formed of cellulose produced by the abovedescribed bacterial culture and its characteristics were evaluated, the Young's modulus of the
formed product was about 10 GPa, and the paper formed used for a normal voice coil bobbin It
was about 5 times the Young's modulus of the object. The resonance sharpness Q was 30 and
was about 1/10 of that of aluminum used for a normal voice coil bobbin. Therefore, since the
speaker devices of the first and second embodiments use a voice coil bobbin which is higher in
rigidity than a voice coil bobbin made of ordinary paper and lower in resonance sharpness Q
than a voice coil bobbin made of aluminum, It was confirmed to have good acoustic
characteristics in a wide region of the high-pitched sound region and to have high fidelity
reproduction.
[0035]
Third Embodiment By the way, in recent years, it is desired to further improve the faithful
reproduction of the speaker device. However, in the speaker device in which the acoustic
diaphragm and the voice coil bobbin are fixed by the adhesive as described above, the rigidity of
the acoustic diaphragm and the voice coil bobbin and the adhesive is significantly different. Then,
since the vibration of the voice coil bobbin is transmitted to the acoustic diaphragm via the fixed
portion, there is a possibility that the vibration can not be accurately transmitted to the acoustic
diaphragm, and the improvement of the fidelity reproduction is limited.
[0036]
Therefore, a speaker device in which an acoustic diaphragm and a voice coil bobbin are integrally
formed has been proposed, and a speaker device having such a configuration is manufactured
using paper, a metal material, and a polymer material. However, when paper is used, the rigidity
is low, and in metal materials and polymer materials, the resonance sharpness Q is high, and it is
difficult to obtain sufficient acoustic characteristics. In addition, in the case of a metal material
and a polymer material, the same problems as in the case where only the voice coil bobbin as
described above is formed also occur. Therefore, in the present embodiment, an example in
which the present invention is applied to a speaker device formed by integrally molding such an
acoustic diaphragm and a voice coil bobbin will be described.
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[0037]
The speaker device of this embodiment is shown in FIG. The speaker device according to the
present embodiment is wound around an acoustic diaphragm 21 having a shape in which the
apex of a cone is an opening and cylindrically extended, and a cylindrical portion 21a which is a
part of the acoustic diaphragm 21. It is comprised by the voice coil 23 as a drive coil. The
operating state of the speaker device is also the same as that described in the first embodiment,
and the cylindrical portion 21a corresponding to the voice coil bobbin portion vibrates due to the
change of the current based on the acoustic signal flowing through the voice coil 23. Then, the
vibration generated in the cylindrical portion 21a is transmitted to the diaphragm portion 21b
corresponding to the acoustic diaphragm portion, and the reproduction sound based on the
acoustic signal is output.
[0038]
Further, in the speaker device according to the present embodiment as well as the first
embodiment, the other end of the acoustic diaphragm 21 is fixed to the fixing portion 25a of the
edge 25 by the adhesive or the like in the fixing portion 21c. In the present embodiment, as in
the first embodiment, the acoustic diaphragm 21 formed of the cylindrical portion 21a
corresponding to the voice coil bobbin portion and the diaphragm portion 21b corresponding to
the acoustic diaphragm portion can be vibrated in the vertical direction in FIG. There is.
[0039]
Further, in the present embodiment, in particular, the acoustic diaphragm 21 composed of the
cylindrical portion 21a and the diaphragm portion 21b is integrally formed of cellulose produced
by bacterial culture.
Thus, when the diaphragm 21b and the cylindrical portion 21a are integrally formed of cellulose,
there is no place where the rigidity differs significantly between the diaphragm 21b
corresponding to the acoustic diaphragm and the cylindrical portion 21a corresponding to the
voice coil bobbin. The vibration generated in the cylindrical portion 21a can be more accurately
transmitted to the diaphragm portion 21b. Therefore, in the speaker device of this embodiment,
the fidelity reproduction is further improved.
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[0040]
Embodiment 4 The speaker device as described in Embodiment 3 is also applicable to a speaker
device using a dome-shaped acoustic diaphragm, and the speaker device of this embodiment is
shown in FIG. The speaker device according to the present embodiment is mainly wound around
an acoustic diaphragm 31 having a shape in which an opening of a hemispherical body is
extended in a cylindrical shape, and a cylindrical portion 31a which is a part of the acoustic
diaphragm 31 and corresponds to a voice coil bobbin portion. It comprises the voice coil 33 as a
drive coil. The operating state of the speaker device of this embodiment is the same as that
described in the first embodiment.
[0041]
Further, also in the speaker device of the present embodiment, in the acoustic diaphragm 31, the
fixing portion 31c which is the side surface of the acoustic diaphragm 31 is fixed to the fixing
portion 35a of the damper 35 by an adhesive or the like. An acoustic diaphragm 31 fixed to a
fixed portion (not shown) of the speaker device and having a voice coil bobbin portion and an
acoustic diaphragm portion in the same manner as in the first embodiment is also capable of
vibrating vertically in the figure.
[0042]
At this time, also in the present embodiment, the acoustic diaphragm 31 is formed of cellulose
produced by bacterial culture, and has the same effect as that of the third embodiment.
A speaker device having a dome-shaped acoustic diaphragm in which a part of the acoustic
diaphragm is made of a voice coil bobbin using cellulose as described above is suitable as a highpitched speaker device.
[0043]
An acoustic diaphragm in which a part of the acoustic diaphragm formed of cellulose as
described above is a voice coil bobbin is formed as follows. The process for producing the voice
coil bobbin described in Example 1 is the same as the method for producing the voice coil bobbin
described in Example 1 until cellulose produced by bacteria is used as a sheet-like member, and
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therefore, the subsequent steps will be described. The manufacturing method described below is
applicable to any of the cone-shaped acoustic diaphragm described in the third embodiment and
the dome-shaped acoustic diaphragm described in the fourth embodiment.
[0044]
First, the sheet-like member is placed on a carrier, inserted between a pair of cone-shaped or
dome-shaped concavo-convex shaped pair of mating molds, and pressed and heated by the
mating mold. At this time, a pair of mating molds of concavo-convex shape are formed using a
member having good drainage property, and simultaneously with drainage by a press, suction is
performed by a vacuum pump to form a sheet-like member along the mold. Form an acoustic
diaphragm material. And, the pair of mating molds of the above-mentioned concavo-convex
shape are shown in FIGS. 3 and 4 so that a portion to be a cone-like or dome-like acoustic
diaphragm and a portion to be a voice coil bobbin can be integrally formed It has a shape in
accordance with the cross-sectional shape of an acoustic diaphragm in which a portion is a voice
coil bobbin portion.
[0045]
Next, the voice coil is wound around the portion to be the voice coil bobbin portion of the
acoustic diaphragm material thus formed by the pair of mating molds of the concavo-convex
shape as in Example 1, but the portion to be the voice coil bobbin portion Since the bottom
portion of the is still in the closed state, this bottom portion is cut to form an opening so that the
winding jig can be inserted. Then, in the same manner as the method of manufacturing the voice
coil bobbin described in the first embodiment, the winding jig is inserted from the opening.
Thereafter, in the same manner as in the method of manufacturing the voice coil bobbin
described in the first embodiment, the lead wire is wound around the portion to be the voice coil
bobbin portion of the acoustic diaphragm material. As a result, an acoustic diaphragm is formed
in which a portion thereof functions as a voice coil bobbin as shown in FIGS.
[0046]
Embodiments 5 and 6 In the above embodiments, the case where the acoustic diaphragm is a
single layer has been described, but it is used when a thick acoustic diaphragm is required as in
the case of a speaker device for middle bass. An embodiment of a speaker device using a multi-
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layered acoustic diaphragm will also be described. In the present embodiment, an embodiment of
a speaker device in which the acoustic diaphragm is a cone type will be described.
[0047]
The speaker apparatus of Example 5, 6 is shown in FIG.5 and FIG.6, respectively. In any of the
speaker devices according to the fifth and sixth embodiments, the acoustic diaphragm 41 and the
cylindrical portion which is a part of the acoustic diaphragm 41 are formed mainly by extending
the apex of a cone as an opening into a cylindrical shape. The voice coil 43 is wound around 41a.
The operating state of the speaker device is the same as that described in the first embodiment.
[0048]
And in Example 5 shown in FIG. 5, the 2nd diaphragm material 46 is laminatedly formed by the
outer wall of the conical diaphragm 41b which functions as an acoustic diaphragm of the
acoustic diaphragm 41 especially. On the other hand, in the sixth embodiment shown in FIG. 6, in
particular, the second diaphragm material 46 is laminated on the inner wall of the diaphragm
portion 41b functioning as the acoustic diaphragm of the acoustic diaphragm 41.
[0049]
At this time, in the fifth and sixth embodiments, the acoustic diaphragm 41 is formed of cellulose
produced by bacteria. Further, the second diaphragm material 46 in the fifth and sixth
embodiments is generally used as a diaphragm material such as paper, polymer material film,
carbon fiber, high strength fiber such as aromatic polyamide, mica, etc. Any method may be used.
Further, of the above-mentioned diaphragm materials, paper is preferable because of its good
adhesion to cellulose produced by bacteria.
[0050]
In the speaker device of the fifth embodiment, as in the first embodiment, the edge 45 is fixed to
the inner wall of the diaphragm portion 41b of the acoustic diaphragm 41, and the edge 45 is
fixed to a frame (not shown). In the speaker device according to the sixth embodiment, as in the
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first embodiment, the edge 45 is fixed on the second diaphragm material 46 on the diaphragm
portion 41b of the acoustic diaphragm 41, and a frame (not shown) is provided. The edge 45 is
fixed. As a result, in the fifth and sixth embodiments, as in the first embodiment, the acoustic
diaphragm 41 is supported so as to be able to vibrate in the vertical direction in the drawing.
[0051]
The speaker device according to the present embodiment is provided with the second diaphragm
material 46 on the inner wall or the outer wall of the diaphragm portion 41 b of the acoustic
diaphragm 41 so as to function as the acoustic diaphragm of the acoustic diaphragm 41. Since
the thickness is increased, as described above, it is suitable as a speaker device for mid-low tones.
This is because the high frequency part of the frequency characteristic of the speaker device
extends in proportion to the cube of the thickness of the acoustic diaphragm particularly in the
case of the speaker device for middle bass, and the thickness in the speaker device for the middle
bass This is because a thick acoustic diaphragm is required.
[0052]
Furthermore, in the speaker device of the present embodiment, not only the thickness of the
diaphragm portion 41 b of the acoustic diaphragm 41 is increased merely by the second
diaphragm material 46, but the material of the acoustic diaphragm 41 is produced by bacteria.
Since the used cellulose is used, the high region of the frequency characteristic can be further
extended, and the characteristic is further improved.
[0053]
By the way, as a method of laminating and forming the second diaphragm material 46 made of
paper on the inner wall or the outer wall of the acoustic diaphragm 41 as described above, in
addition to the method using the adhesive as described above, There is a method of using it.
Here, the case where the second diaphragm material 46 is formed on the outer wall of the
acoustic diaphragm 41 will be described.
[0054]
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When laminating the second diaphragm material 46 using the paper making process as
described above, first, the second diaphragm material 46 made of paper by the first paper
making process is a cone as shown in FIG. Papermaking into shape. Thereafter, the second
diaphragm material 46 is transferred to a slightly deeper mold, and an acoustic diaphragm 41
made of cellulose produced by bacteria is made on the second diaphragm material 46. Thus, by
performing paper making twice, the diaphragm portion 41 b of the acoustic diaphragm 41 and
the second diaphragm material 46 are bonded by hydrogen bonding, and the second diaphragm
material 46 is formed on the outer wall of the acoustic diaphragm 41. Layers are formed.
[0055]
And according to the above papermaking process, it is conceivable to form the acoustic
diaphragm 41 having a thick acoustic diaphragm portion only with cellulose, but this is not
appropriate because the papermaking requires a long time.
[0056]
In addition, the characteristics required for the second diaphragm material 46 include a high
longitudinal wave propagation speed and a low resonance sharpness Q. Therefore, as the second
diaphragm material, the above-mentioned materials are required. However, using paper as the
second diaphragm material 46 as described in the present embodiment is not limited to the cost
and the point that bonding with the acoustic diaphragm 41 by hydrogen bonding is possible. It is
preferable to use a high strength fiber, mica or the like to further improve the characteristics of
the mid-low range speaker device.
[0057]
Embodiments 7 and 8 Next, an embodiment of a speaker device in which the acoustic diaphragm
has a dome shape will be described.
The speaker apparatus of Example 7, 8 is shown in FIG. 7, FIG. 8, respectively.
In any of the speaker devices according to the seventh and seventh embodiments, the acoustic
diaphragm 51 having a shape in which the opening of the hemispherical body is extended in a
cylindrical shape and the cylindrical portion 51a which is a part of the acoustic diaphragm 51
are mainly wound around It comprises the voice coil 53 as a drive coil. The operating state of the
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speaker device is the same as that described in the first embodiment.
[0058]
And in Example 7 shown in FIG. 7, the 2nd diaphragm material 56 is laminatedly formed by the
inner wall of the hemispherical diaphragm part 51b which functions as an acoustic diaphragm of
the acoustic diaphragm 51. As shown in FIG. On the other hand, in the eighth embodiment shown
in FIG. 8, the second diaphragm material 56 is laminated on the outer wall of the diaphragm
portion 51 b functioning as the acoustic diaphragm of the acoustic diaphragm 51.
[0059]
At this time, in Examples 7 and 8, the acoustic diaphragm 51 is formed of cellulose produced by
bacteria. Moreover, as a material which comprises the said 2nd diaphragm material 56 in
Example 7, 8, since the dome-shaped acoustic diaphragm is suitable for the speaker apparatus
for high-pitched regions comparatively, metals, such as Ti and Al, It is preferable to use a
material.
[0060]
As in the second embodiment, the damper 55 is fixed to the acoustic diaphragm 51, and the
damper 55 is fixed to the fixed portion of the speaker device (not shown). As a result, in the
seventh and eighth embodiments, as in the first embodiment, the acoustic diaphragm 51 is
supported so as to be able to vibrate in the vertical direction in the drawing.
[0061]
Therefore, in the speaker device of the present embodiment, since the metal material is used as
the second diaphragm material 56, the high frequency characteristic can be extended. Further, in
the speaker device of the present embodiment, since the acoustic diaphragm 51 is formed of
cellulose produced by bacteria, it is generated in the high frequency portion of the frequency
characteristic by the metal material of the second diaphragm material 56 Sharp peaks can be
reduced.
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[0062]
When the speaker device of this embodiment is used as a tweeter, a speaker device with high
responsiveness can be realized. This is because the weight of the acoustic diaphragm 51 itself is
light, and the rising of the input signal is quicker than in the case of using other diaphragm
materials, and the acoustic diaphragm 51 is This is because the vibration is damped quickly
because the resonance sharpness Q of cellulose itself is low due to the production of the
constituting bacteria.
[0063]
As described above, as a method of attaching the second diaphragm material 56 made of metal to
the inner wall or the outer wall of the acoustic diaphragm 51, sputtering or the like is used in
addition to the method using the adhesive as described above. The method is mentioned.
[0064]
In the speaker device using the acoustic diaphragm of the multilayer structure described in the
present embodiment and the fifth and sixth embodiments, a part thereof as described in the
embodiments functions as a voice coil bobbin, and the acoustic diaphragm and the voice coil
bobbin The present invention is also applicable to a speaker device in which an acoustic
diaphragm and a voice coil bobbin are fixed by an adhesive as described in the first embodiment,
in addition to the one in which they are integrally formed.
[0065]
As is apparent from the above description, according to the first aspect of the present invention,
an acoustic diaphragm, a bobbin connected to the acoustic diaphragm, a voice coil wound around
the bobbin, and the voice coil are opposed to each other. In the speaker device comprising a
magnetic circuit disposed at the same position, at least the bobbin is formed of cellulose
produced by bacterial culture, so the bobbin is light in weight and highly rigid, and its resonance
sharpness Q and conductivity are low. Become.
Therefore, the vibration generated on the bobbin is sufficiently transmitted to the acoustic
diaphragm, making it difficult for the abnormal sound unique to the bobbin forming material to
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be generated, and having excellent acoustic characteristics over a wide range from the low range
to the high range, and high fidelity reproduction It is possible to obtain a speaker device that
makes it possible.
[0066]
In the present invention, in the above speaker device, the second diaphragm material may be
laminated on the acoustic diaphragm, and a speaker suitable for a mid-bass region requiring a
thick acoustic diaphragm. It is also possible to form an apparatus.
[0067]
Further, according to a second aspect of the present invention, there is provided a speaker device
comprising an acoustic diaphragm having a diaphragm portion and a bobbin portion, a voice coil
wound around the bobbin portion, and a magnetic circuit disposed at a position facing the voice
coil. The diaphragm portion and the bobbin portion are integrally formed of cellulose produced
by bacterial culture, so there is no fixed portion having different rigidity, and the diaphragm
portion which functions as a bobbin and functions as an acoustic diaphragm Since the parts are
made of the same material, it is possible to more accurately transmit the vibration generated in
the bobbin part to the diaphragm part, and the fidelity reproduction is further improved.
[0068]
Furthermore, in the present invention, in the above-described speaker device, the second
diaphragm material may be laminated on the diaphragm portion, which is suitable for a mid-bass
region requiring a thick acoustic diaphragm. It is also possible to form a loudspeaker device.
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19
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