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JPS5587791

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DESCRIPTION JPS5587791
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are cross-sectional views of the
diaphragm of the present invention. 1 is aluminum nitride, 2 is plastic, 3 is metal.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a
speaker diaphragm. Heretofore, in order to increase the internal loss and increase the Young's
modulus as a material of the speaker diaphragm, a general (a fibrous diaphragm made of a
natural balf has been used. As the speaker's output increases, the Young's modulus is kept larger
as the diaphragm, and when it is intended to have a suitable internal loss and a large rigidity, the
thickness of the diaphragm becomes thick, and an unnecessary mass of There is a drawback that
an increase occurs and the efficiency of the speaker decreases. , 44 F / 7774) 2 On the other
hand, beryllium, titanium or carbides thereof, nitrides, borides or the like may be used as the
material of the rigid diaphragm. Although these all have large rigidity, the resonance sharpness Q
is high and the internal loss is small, so that there is a drawback that a steep heater is generated
near the high frequency range limit frequency. In order to improve the defects in F, there is one
that vapor-deposits IJIJ aluminum in a plastic manner, or beryllium vapor is harmful to the
human body and scarce in mass productivity, and it is expensive (it has a drawback). The present
invention was devised to eliminate the above-mentioned disadvantages, and the embodiment
shown in the drawings will be described with reference to FIG. Aluminum nitride particles are
formed by vapor phase reaction by evaporating aluminum onto nitrogen gas I atmosphere on the
surface of diaphragm film-shaped turtle film material 2 with high heat resistance such as a
hololiid resin, thereby forming aluminum nitride 1 Is a diaphragm for a slider made by attaching
Further, as shown in FIG. 2, a speaker diaphragm is also included, in which aluminum nitride 1 is
attached to the surface 3 of a desired shape (a metal 3 such as aluminum or titanium that has
been formed by ion ablation). A comparison of aluminum nitride and aluminum according to the
present invention is shown in the following table. Young's modulus dyne / cml density aluminum
7.2x102.69 aluminum nitride 28.8x103.25 Since the device has the above structure or structure,
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the one obtained by depositing aluminum nitride 1 on plastic 2 has a jump in Young's modulus It
is possible to obtain a speaker diaphragm which can be increased, the rigidity is increased, a
moderate internal loss can be obtained, the increase in density is small, and the output can be
high. In addition, the metal 3 (with aluminum nitride 1 deposited has a dramatic increase in
Young's modulus, rigidity is increased, density increase is small, and a speaker diaphragm for an
acoustic speaker that can withstand high output is obtained. It is a thing. As described above, the
present invention is an apparatus which deposits aluminum nitride on the surface of the plastic 2
or the metal 3 and dramatically increases the Young's modulus. It is also a relatively low priced,
useful device that can be mass produced.
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