Electro-acoustic transducer having a diaphragm comprising a laye

Details Electro-acoustic transducer having a diaphragm comprising a laye Electro-acoustic transducer having a diaphragm comprising a laye

1983-02-17

1985-05-14

Rubinson, Gene Z.

Acoustics

Anatomic or prosthetic relation

Ear and mouth

179116, 179181R, 179181F, 179180, 181144, 181146, 181163, 181167, H04K 124, H04K 128, H04K 700

Patent

active

045174164

ABSTRACT:
An electro-acoustic transducer has a diaphragm which comprises a layer of a polymethacrylimide foam having a modulus of elasticity between 15.times.10.sup.6 and 120.times.10.sup.6 N/m.sup.2 and a density between 10 and 80 kg/m.sup.3. If the diaphragm has a sandwich construction, the core layer is made of said polymethacrylimide foam and the skin layers are made of glass fibres, carbon fibres, cellulose fibres or polyaramide fibres. This results in a transducer having a higher efficiency and a lower distortion.

REFERENCES:
patent: 3172498 (1965-03-01), Gonke
patent: 3350513 (1967-10-01), Roberts
patent: 4410768 (1983-10-01), Nakamura et al.

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