Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1987-08-03
1989-02-07
Lieberman, Allan M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524 10, 524 56, 1061631, 162158, 162175, 381204, C08L 102, C08L 508, C08L 5102, H04R 906
Patent
active
048032425
ABSTRACT:
A diaphragm for loudspeakers comprises chitin as a natural high polymeric material having a large value of Young's modulus and kraft pulp having large mechanical internal loss. Therefore, the deformation and the partial vibrations of the diaphragm during diaphragm operation do not come out due to the use of the chitin, because the flexural rigidity of the diaphragm is considerably large. Mechanical internal loss is also large owing to the use of the kraft pulp. As a result, it is possible to obtain a loudspeaker which has little fluctuation in frequency response, and which provides a superior sound pressure-frequency response, a superior distortion factor and a superior phase response.
REFERENCES:
patent: 3768590 (1973-10-01), Yocum
patent: 3937905 (1976-02-01), Manger
Murata Kousaku
Saiki Shuji
Takayama Satoshi
Takewa Hiroyuki
Tanaka Tsuneo
Lieberman Allan M.
Matsushita Electric Inductrial Co., Ltd.
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