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Description 11 of the Invention Electrokinetic Electroacoustic Transducer (1) A Structure
Composed of a Composite of a Metal Porous Body Having a Three-Dimensional Random Network
Structure Having Communication Pores and a Vibration Damping Material Composed of a
Polymer Material An electrodynamic electroacoustic transducer characterized by the above.
2 Claims
3. Detailed Description of the Invention The present invention relates to the improvement of
electrodynamic electroacoustic transducers, that is, speakers used for stereo, radio and the like.
The improvement of the speaker is to widen the frequency response and to increase the vibration
loss over the entire frequency range, and in particular to suppress the peak at the resonance
frequency. By suppressing this peak, harmonic distortion in the reproduction band is reduced,
and a speaker capable of reproduction close to the original sound can be obtained. Generally as a
diaphragm of a speaker, what shape ¦ molded paper in cone shape is utilized. It can be
considered that the tapping used in paper is lightweight, inexpensive, easy to form, large in
vibration loss, and large in braking effect of EndPage: 1 vibration. However, the fact that the
material or the paper is 34 j-stability, temperature, humidity stability is low, maintenance of
quality is a constant word against aging. Furthermore, the small amplitude of the paper means
that the 1 m wave number region in which the piston vibration of the diaphragm is realized is
suppressed to several hundred hertz or less, and at frequencies above that, the vibration of the
diaphragm is '411 k' And other complex multiple resonances occur and degrade the frequency
characteristics of the speaker. Furthermore, there are many problems that occur when the paper
is used as a diaphragm, such as the degree of characteristic deterioration being exacerbated by
the environment of temperature and humidity. Wide frequency? The development of a
diaphragm with flat frequency v-teeth characteristics is considered by eliminating the split
vibration and multiple resonances of the diaphragm in the rI region, and the use of Ti, Be and
A1% metal fertilizer thin sheet is considered. There is. The rigidity of these thin metal sheets is
several times superior to that of paper and serves to expand the regeneration zone. However, the
frequency characteristics of the speaker using such a thin metal plate, the sound pressure beak
at the resonance frequency is high <, causing 1F11 wave distortion, while the reproduced sound
contains distortion (d! となっている。 In the case of a thin metal plate, the weight is large, which
causes the output efficiency of the speaker to be reduced. The present invention provides a
speaker with improved transient characteristics and frequency characteristics by improving the
diaphragm, focusing on the diaphragm that is the cause of the frequency characteristic
deterioration of the electrodynamic electroacoustic transducer described above. is there. That is,
the present invention provides a diaphragm having a weight equal to that of paper, having a
metal hiI property, and also having a vibration loss. A part of the appearance of a porous body
made of metal and resin used as a diaphragm of the electrodynamic electroacoustic transducer of
the present invention is shown enlarged in FIG. The structure is such that a framework 1 of a
cross-sectional structure as shown in FIG. 2 (a) or 1l-1 '(b) is continuous, with a communicating
air and a hole 2 therebetween.
The skeleton 1 is made of a metal layer and a resin j · ga 3 integrally formed on the metal layer.
The rigidity is received by the metal layer t 1 and the vibration loss is received by the resin layer
3. S shows a cavity. For this reason, it turned out that it will become a speaker which has a
frequency characteristic excellent compared with the speaker which used the diaphragm which
consists of paper conventionally used, and the diaphragm which consists of a single metal. Since
the three-dimensional irregular net-like structure has communicating pores as shown in FIG. 1, it
can not be used as a diaphragm as it is. Therefore, in order to occlude the communicating pores,
a paint with high viscoelasticity is applied to the surface to further damp the vibration, and at the
same time, the air permeability can be eliminated. Furthermore, a thin resin film can be crimped
to one side or both sides. The similar product of the three-dimensional irregular reticulated metal
body of the present invention is disclosed in Japanese Patent Publication No. 31- / 7! The fn can
also be produced by the dipping method described in the J. J. No. 3 Japanese Patent Publication
No. 3 TA-GOS No. or the Japanese Patent Publication No. 113-2 torq No. The disadvantage of
these manufactures is that it is difficult to finely control the perforated shell. It is difficult to
control the density, which is an essential element of electrokinetic electrical and acoustic
transducers. Therefore, the variation of the product becomes large, and the yield is deteriorated
to suppress the increase, and the cost becomes high, which is not the optimum manufacturing
method. Inventors V-1 found out a manufacturing method which can control the pore size
minutely without these drawbacks. That is, for example, a method of thinning a metal into a resin
such as urethane foam or a conductive foam resin, and roasting and reducing the skeleton resin
at a high temperature. In the present invention, a diaphragm that does not undergo roasting
reduction after plating is JH. Alternatively, it is used by immersing it in a solution in which
urethane, polyethylene, probe, etc. is dissolved in an organic solvent to form a resin layer on the
surface of the resin, and the resin layer is ashed and reduced. According to this method, since the
amount of electrodeposition of metal mainly occupying weight can be controlled to fine thread, it
is possible to easily obtain 02 to 0.3 g / (a3) most suitable for the electrodynamic electroacoustic
transducer. The frequency characteristics of the speaker manufactured using the diaphragm of
the present invention are expanded to the limit of piston vibration of the diaphragm from 300 to
100 H 2 to 700-OOH, compared to the conventional paper diaphragm speaker In addition,
multiple resonances due to split vibration and the like do not occur in the reproduction band, and
the frequency characteristics become flat and reproduction close to the original sound becomes
possible. In addition, compared with the single-plate diaphragm, its vibration EndPage: Twomotion loss is increased, the peak at resonance is decreased, and harmonic distortion can be
The diaphragm according to the present invention exhibits the same effect not only on the
woofer that takes on the low frequency range, but also on the mid-range skooka-1 high
frequency range tweeter and the like. Moreover, it is not limited to such a cone-shaped speaker,
It can be widely utilized also as a diaphragm of a dynamo-electric mine and an air-sound thing
converter. FIG. 3 shows the result of the frequency characteristic in the case of the woofer which
has a low frequency range. In the figure, the paper is made of paper, 7 is made of metal, and g is
a frequency characteristic of the diaphragm in which the urethane foam according to the present
invention is plated with N1 and the A1 foil is adhered.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a three-dimensional
irregular network structure used in the present invention. FIG. FIG. 2 is a cross-sectional view of
the skeleton, in which 3 is a metal layer, 1 is a resin layer, and S is an open cavity. FIG. 3 is a
chart showing the characteristics of the example of the present invention and the comparative
example. 昂 2 district (mountain) (b) EndPage: 3
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