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JPH0779496

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DESCRIPTION JPH0779496
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker for use in an audio output device or the like.
[0002]
2. Description of the Related Art In recent years, in the audio-related industry, along with the
digitization of reproduced music sources, high-quality sound with excellent output sound
pressure, distortion rate, and flatness more than before in characteristics of a speaker as an
acoustic output device Speakers are desired, and speakers that influence the acoustic
characteristics are considered more and more important.
[0003]
Hereinafter, the configuration of the above-described conventional speaker will be described with
reference to FIG.
[0004]
The speaker comprises a vibration system such as diaphragm 1, voice coil bobbin 2 and voice
coil 3, and a magnetic circuit system comprising magnet 4, plate with center pole 5, top plate 6
and frame 7.
[0005]
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The diaphragm 1 is fixed to a voice coil bobbin 2, and a voice coil 3 provided at the tip of the
voice coil bobbin 2 is inserted into the magnetic gap 8 of the magnetic circuit.
[0006]
The operation of the loudspeaker configured as described above will be described below.
When a voice current flows in the voice coil 3 in a uniform magnetic field, a vertical
electromagnetic force is generated in the voice coil 3 and vibrates according to the current.
This vibration is transmitted to the diaphragm 1 and emitted from the diaphragm 1 as a sound
wave.
[0007]
Further, the voice current flowing through the voice coil 3 generates an electromagnetic force
and is mostly converted as thermal energy.
The temperature of the voice coil 3 at this time becomes high according to the magnitude of the
input audio current, often exceeding 200.degree.
Since this heat is also transmitted to the diaphragm 1 through the voice coil bobbin 2, the
diaphragm 1 made of a material having a low thermal deformation temperature is deformed, and
the generated sound is distorted or noise is generated. Become.
[0008]
The diaphragm 1 ideally moves in a piston over the frequency band to be used, but if the
diaphragm 1 is deformed or split vibration occurs during vibration, the sound pressurefrequency The characteristics, distortion rate, phase characteristics, etc. are degraded, which
hinders high fidelity reproduction. In addition, the diaphragm material made of pulp, which is
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often used in the past, has a small E / ((where E: elastic modulus, :: density), so the high
frequency resonance frequency is low and the speaker can not reproduce to high frequencies.
There was a drawback.
[0009]
Heretofore, in order to compensate for the defect of the diaphragm using this pulp, a method of
impregnating a resin with a high elastic modulus as a reinforcing material or coating it on the
surface of the diaphragm has been performed.
[0010]
In addition, in terms of appearance, high-grade images are also required, and in order to improve
the appearance of paper, a method of applying a coating agent to the surface or laminating a
resin film is used. It has often been limited mainly to those based on thermoplastics from the
handling point.
[0011]
However, the speaker becomes severe in the use environment with an increase in the demand for
the vehicle, and has been forced to use it particularly under high temperature.
Furthermore, as the amplifier output of the playback device increases, the amount of heat
generation of the voice coil at the time of large input also increases, and the temperature
environment near the voice coil is becoming severe.
[0012]
In connection with this, in each of an impregnating material, a coating agent, and a lamination
material, there was a problem in the thing with low heat resistance in order to compensate the
fault of the diaphragm using pulp.
[0013]
The present invention solves the above-mentioned conventional problems, and the diaphragm is
not deformed during vibration or does not cause divided vibration, the high region resonance
frequency is high, and the sound pressure-frequency characteristics, distortion rate, and phase
characteristics are excellent. In addition, the present invention aims to provide a speaker having
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high heat resistance, solvent resistance, weather resistance, and a high-quality image in
appearance.
[0014]
[Means for Solving the Problems] In order to achieve the above object, the speaker of the present
invention is characterized in that the chitin, which is the main component of crustacean shell
formation, is dimethylacetamide, N-methyl-2-pyrrolidone, lithium chloride, etc. Is dissolved in a
mixed solvent, and at least one surface of a film-like molded product formed from the solution is
deacetylated to form a chitosan-formed film-like molded product, and a paper mainly comprising
pulp is laminated It has the composition of using the diaphragm which shape | molded the abovementioned composition in a predetermined shape.
[0015]
According to this configuration, the chitin has a skeleton similar to that of the cellulose
constituting the pulp in terms of chemical structure, and has a high elastic modulus. However,
when this is used as a diaphragm, the flexural rigidity of the diaphragm is very large, and it is
extremely rare that the diaphragm is deformed or split resonance occurs during vibration.
In addition, a structure in which a film-like formed article in which a chitosan layer is formed by
deacetylating at least one surface of a film-like formed article made of chitin as a substrate is
laminated with a paper composed mainly of pulp to a predetermined shape Since the molded
component is used, the specific elastic modulus E / ρ (where E: elastic modulus, :: density) is
large, and when this is used as a diaphragm, the reproduction band of the speaker is extended to
the high sound side, It is possible to obtain a speaker having excellent sound pressure-frequency
characteristics, distortion rate, and phase characteristics.
In addition, since chitin has a very large internal loss, when a structure in which this is laminated
with paper made mainly of pulp is used as a diaphragm, the peaks and valleys of the sound
pressure-frequency characteristics of the speaker are flattened. And faithful acoustic
characteristics can be obtained.
[0016]
Furthermore, since this diaphragm material uses a chitin film of a natural polymer, it is excellent
in solvent resistance, heat resistance and weather resistance, and when the composition using
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this is used as a diaphragm The speaker can receive a large input signal, and can withstand the
use of the speaker under severe conditions.
[0017]
Embodiment 1 Hereinafter, a speaker according to an embodiment of the present invention will
be described with reference to the drawings.
[0018]
In FIG. 1, the speaker according to an embodiment of the present invention is a film-shaped
molded product having a chitosan layer formed by deacetylating the surface of a chitin, which is
a main component of a shell-shaped shell forming material, formed into a film. The structure
which laminated | stacked the paper which has a pulp as a main is shape | molded in the shape
of a diaphragm, and is used.
The diaphragm 10 is fixed to the voice coil bobbin 11, and the voice coil 12 provided at the end
of the voice coil bobbin 11 is inserted into the magnetic gap 17 of the magnetic circuit 16
composed of the plate 13 with center pole, magnet 14 and top plate 15. ing.
The peripheral portion of the diaphragm 10 is coupled to the peripheral portion of the frame 18
coupled to the magnetic circuit 16 together with the gasket 19.
Further, in the figure, reference numeral 20 denotes a dust cap coupled to the central portion of
the diaphragm 10, and reference numeral 21 denotes a damper for holding an intermediate
portion of the voice coil bobbin 11.
[0019]
The operation of the loudspeaker configured as described above will be described below.
The speaker is composed of a diaphragm 10, a voice coil bobbin 11, a vibration system such as a
voice coil 12, a magnet 14, a plate 13 with a center pole, a magnetic circuit 16 including a top
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plate 15, and a casing such as a frame 18. When a voice current flows in the voice coil 12 in a
uniform magnetic field, a vertical electromagnetic force is generated in the voice coil 12 and
vibrates according to the current. This vibration is correctly transmitted to the diaphragm 10 and
emitted as a sound wave.
[0020]
Further, the voice current flowing through the voice coil 12 generates an electromagnetic force
and is mostly converted as thermal energy. The temperature of the voice coil 12 at this time
becomes high according to the magnitude of the input voice current, and often exceeds
200.degree. Since this heat is also transmitted to the diaphragm 10 through the voice coil bobbin
11, the diaphragm 10 made of a material having a low thermal deformation temperature is
deformed, causing the generated sound to be distorted or causing noise. .
[0021]
Next, the structure of the diaphragm 10 will be described with reference to FIG. 2. The chitin,
which is the main component of crustacean crust formation, is used as a solvent such as
dimethylacetamide, N-methyl-2-pyrrolidone, lithium chloride and the like. The mixture is
dissolved in a mixed solvent, and a wet film forming method and a 10 μm to 200 μm thick film
are formed from the solution. Thereafter, concentrated alkali treatment is performed on at least
one surface to deacetylate the surface to form a film-like molded product 22 in which the
chitosan layer 21 is formed. The film-like molding 22 is immersed in water to be hydrated to
swell the chitosan layer 21.
[0022]
Separately, kraft pulp is beaten using a beater or the like, 0.1 to 0.3% by weight of this is
dispersed in water, made into paper using punching metal or 40 to 80 mesh wire mesh, and
water content is reduced to a predetermined level. The sheet is dewatered to form a paper sheet
23.
[0023]
Then, the film-like molded product 22 is stacked so that the chitosan layer 21 is in contact with
the paper sheet 23, and is molded into a predetermined diaphragm by a heat press, a hot air
dryer or the like.
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[0024]
At this time, if the water for immersing the film-like product 22 is weakly acidified with pH 7 to 5
with hydrochloric acid, acetic acid, etc., the chitosan layer 21 is easily swollen, and the pulp
fibers of the film-like product 22 and the paper sheet 23 at the time of dry forming Adheres
easily to form a strong bond, and the modulus of elasticity of the molded product is improved.
[0025]
(Example 2) In Example 1, after kraft pulp is dispersed in water, 0.1 to 1% relative to the absolute
weight of pulp is added with alkyl ketene dimer, polyamidepolyamine-epichlorohydrin resin, etc.
as a binder. The sheet is formed and formed in the same manner as in Example 1.
[0026]
At this time, during heating and drying, the epoxy group in the polyamidepolyamineepichlorohydrin, the amino group in the chitosan on the surface of the chitin film, and the
hydroxyl group in the cellulose constituting the kraft pulp react chemically to form a strong
bond, The modulus of elasticity is further improved.
[0027]
As described above, according to the present embodiment, the film-shaped formed article 22 and
paper in which the surface of the chitin, which is the main component of the shell component of
the crustacean, is formed into a film and is deacetylated to form the chitosan layer 21 A speaker
using a diaphragm formed by laminating and forming the sheets 23 does not produce
deformation or vibration of the diaphragm and good acoustic characteristics are obtained, and
the distortion ratio is 21 dB as compared with a pulp cone diaphragm. It can be lowered.
[0028]
The peaks and valleys of the sound pressure-frequency characteristics were also ± 3 dB, which
was about ± 3 dB lower than that of the pulp diaphragm.
[0029]
The physical properties of the composition of the laminated structure of the chitin film-like
molding and the paper sheet of pulp used in the present invention and the pulp sheet
conventionally used are shown in Table 1.
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[0031]
As described above, according to the present invention, the structure in which the chitin film-like
molding, which is the main component of the shell composition of the crustacean, and the paper
are laminated is used as a diaphragm, and the distortion ratio is small. , A high-resonance
frequency is high, it has good acoustic characteristics and sound quality, and it is possible to
obtain a speaker with high heat output, high resistance to solvents, high weather resistance, and
high resistance to input, and a large sound output. A speaker having good acoustic
characteristics and sound quality and high reliability can be realized.
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