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JPS57123799

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DESCRIPTION JPS57123799
Description 1, title of the invention
Speaker diaphragm and method of manufacturing the same
3. Detailed Description of the Invention The present invention provides a speaker diaphragm
capable of suppressing the resonance specific to a metal diaphragm and a method of
manufacturing the same. Heretofore, a paper having a proper elastic modulus and internal plant
loss has been used as the speaker diaphragm. In particular, the properties required of the
speaker diaphragm are that the elastic modulus is high and the internal loss and loss are large. In
recent years, various diaphragm materials have been developed, but materials which have both
elastic modulus and internal loss are hardly found. Conventionally, aluminum, titanium or the like
is used as a material having a high elastic modulus, and in recent years, a metal such as boron or
beryllium is used for a diaphragm. However, although the diaphragms of these metals can
expand the frequency band because of their high elastic modulus, they have a large resonance
peak in the high region and it is difficult to flatten the frequency characteristics. This is because
the internal loss of the metal diaphragm is small. For this reason, various methods have been
tried to provide internal loss to the metal diaphragm, but sufficient results have not been
achieved. The present invention is to eliminate the disadvantages of the above-mentioned
conventional metal diaphragm, and to form a non-woven fabric on the metal diaphragm to
increase the internal loss. The metals mentioned here are aluminum, titanium, boron, beryllium,
and the like. The non-woven fabric is made of polyethylene, polypropylene, nylon, polyester, and
the like. EndPage: 1 plastic made of a resin, such as fluorocarbon, tack and vinyl acetate, and a
binder made of a thermoplastic resin such as vinyl chloride and vinyl chloride. Heretofore, in
order to laminate a non-woven fabric to metal, an adhesive is required to 3'-bond, weight gain
and adhesion are insufficient. The method according to the invention is such that a strong
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composite material is obtained because it is adhered to a metal surface by an electrochemical
method. Examples of the present invention will be described below. As shown in the first instep,
the dome-shaped aluminum diaphragm 1 is used as an anode and a flat plate cathode 2 of brass,
and both a nylon block and a slurry consisting mainly of a polyacrylate and a polyacrylate in a
slurry 3 consisting of an anchor. Insert an electrode and apply a DC voltage to it. The floc and
binder concentration is 0.7%, the bath temperature is 46 ░ C., the voltage is 120 V, the current
application time is 6 minutes, and the distance between electrodes is 3 cm. 'Nylon is a floe of 1.6
deniers and 0.7 mm, and the mixture of floe and binder is stirred with a stir bar during
energization. The formed nonwoven was 45 rnq / af.
Two shakers were assembled using the vibration and moving plate manufactured in this way, and
the frequency characteristics were measured by JIS BOX. " The frequency characteristics of are
shown in FIG. The broken line in FIG. 2 indicates the characteristics of the speaker using the
aluminum-nium diaphragm. The physical property values of the diaphragm of the above
embodiment are elastic modulus E = 65 О 10 dyn. The internal loss tan ? was 0.02. In addition,
Z luminium is E = 70x10 dyn / QIP, t-an delta = o, and Oo40. Further, the elastic modulus' E and
the internal loss tan ? in the case where the diaphragm of the above embodiment is heat-treated
at a temperature of 250 ░ C. and the third nylon floc is melted are respectively yn / cnF5 tan ?
= 0.015. As described above, the present invention is an electrochemical method in which the
internal loss of the metal diaphragm is increased. According to the present invention, it is
advantageous to obtain a flat, wide-band frequency speaker. It is possessed.
4. Brief description of the drawings. FIG. 1 is a schematic view showing a method of
manufacturing a speaker diaphragm in one embodiment of the present invention, and FIG. 2 is a
speaker diaphragm manufactured by the manufacturing method of the present invention. It is a
sound pressure frequency-characteristics figure of the speaker which had been. 1 ░ old иии
Aluminum diaphragm, 2 и river "░ flat cathode, 3 и и и и и и и и и и Agent name Patent attorney Nakao.
, Toshio et al. 1 person Fig. 1 N 2 Fig. 1 cycle Chichi CHt) EndPage: ?
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