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JP2006319588

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DESCRIPTION JP2006319588
PROBLEM TO BE SOLVED: To provide a diaphragm for an electroacoustic transducer which
improves the sound quality of a diaphragm made of foam mica and can be used not only for WF
but also as a speaker for full range. SOLUTION: A skin layer is provided on at least one surface of
a diaphragm substrate made of foam mica, various physical properties are improved, the sound
quality of middle and high frequencies is improved, and it is possible to use it for a full range
speaker. [Selected figure] Figure 1
Electroacoustic transducer diaphragm
[0001]
The present invention relates to a diaphragm for an electroacoustic transducer such as a speaker
which is a kind of acoustic equipment, and more particularly to a diaphragm for an
electroacoustic transducer made of foam mica.
[0002]
As physical properties required for the diaphragm, for example, it is required to have high
elasticity, appropriate internal loss, rigidity, and light weight.
[0003]
In order to reduce the weight of the diaphragm, there is one in which the diaphragm has a foam
structure.
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1
[0004]
As this type of diaphragm, for example, as shown in Japanese Patent Application Laid-Open No.
60-41397, a multi-foam structure is obtained by heating a paper-made product comprising fine
mica flakes, pulp fibers, synthetic fibers, etc. is there.
Japanese Patent Laid-Open No. 60-41397
[0005]
The diaphragm based on the so-called foamed mica as described above is an excellent material in
terms of specific gravity and bending rigidity as compared to a diaphragm made of paper, but
since its structure is hollow with a multi-bubble structure, piston motion Although it is good in
the region, there is a problem with the sound quality in the split resonance region.
[0006]
The foam mica diaphragm was mainly used for the WF diaphragm due to the above-mentioned
reason.
[0007]
An object of the present invention is to provide a diaphragm for an electroacoustic transducer
which improves the sound quality of a diaphragm made of foam mica and can be used not only
for WF but also for a full range speaker.
[0008]
According to the first aspect of the present invention, the above object is achieved by providing
the skin layer on at least one surface of the foam mica diaphragm substrate.
According to a second aspect of the invention, in the diaphragm for an electroacoustic transducer
according to the first aspect, the skin layer is made of metal foil or a thermoplastic resin.
[0009]
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2
According to the diaphragm of the present invention according to claims 1 and 2, since the skin
layer is provided on the surface of the diaphragm substrate made of foam mica, the propagation
of the sound wave on the surface is improved, and the sound quality of the middle and high
frequencies can be improved. In addition, since the Young's modulus, sound velocity, specific
bending rigidity, tan δ, etc. have been improved, the extension of the high region is improved,
and the reproduction frequency band is broadened. it can.
[0010]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0011]
Embodiment 1 FIG. 1 shows a schematic cross-sectional view of an embodiment of a diaphragm
for an electro-acoustic transducer according to the present invention.
[0012]
In the figure, reference numeral 1 denotes a diaphragm substrate including foam mica 2.
[0013]
In order to obtain desired physical properties, the diaphragm base material 1 is configured to be
mixed with a desired amount of an appropriate material such as a resin, a synthetic fiber, etc. as
necessary in addition to the foam mica 2.
[0014]
Reference numeral 3 denotes a skin layer laminated on at least one surface of the diaphragm
substrate 1.
[0015]
For example, a metal foil such as an aluminum foil is used as the skin layer 3 and is bonded to
the surface of the diaphragm substrate 1 with an adhesive.
[0016]
In the illustrated embodiment, the skin layers 3 are bonded to both surfaces of the diaphragm
substrate 1 respectively.
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3
[0017]
FIG. 2 shows the measurement results of Young's modulus of a conventional foam mica
diaphragm without a skin layer and the product of the present invention.
A is a conventional product, B is the product of the present invention, and the Young's modulus is
also improved.
[0018]
3 shows the results of measurement of the velocity of sound, FIG. 4 shows the results of
measurement of the specific bending stiffness, and FIG. 5 shows the results of measurement of
tan δ. Both have improved.
[0019]
FIG. 6 shows the frequency characteristics of the product B of the present invention.
In the product of the present invention, by bonding the metal foil such as aluminum foil to the
surface of the diaphragm substrate 1 to form the skin layer 3, the propagation of the sound wave
on the surface can be improved, and the sound quality of the mid-high range is improved. did it.
[0020]
In addition to the metal foil, a thermoplastic resin film such as a polyimide resin film may be used
as the skin layer 3 and also in this case, substantially the same results can be obtained.
[0021]
The schematic sectional drawing of the diaphragm for electric machine acoustic converters
concerning the Example of this invention is shown.
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The measurement results of Young's modulus of the conventional product and the product of the
present invention are shown.
The measurement result of the sound speed of a conventional product and this invention is
shown.
The measurement result of the specific bending rigidity of a conventional product and this
invention is shown.
The measurement results of tan δ of the conventional product and the product of the present
invention are shown.
The frequency characteristic of this-invention goods is shown.
Explanation of sign
[0022]
1 diaphragm base 2 foam mica 3 skin layer A conventional product B present invention product
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