Vibration plate of a speaker and method for producing same

Details Vibration plate of a speaker and method for producing same Vibration plate of a speaker and method for producing same

1993-07-15

1995-07-11

McCamish, Marion E.

Stock material or miscellaneous articles

Self-sustaining carbon mass or layer with impregnant or...

428245, 428252, 428260, 428265, 428272, 428469, 428701, 427113, 427249, 427590, 264108, 20419211, 20419215, 181169, B32B 900

Patent

active

054320046

ABSTRACT:
The present invention relates to a diamond vibration plate for a speaker having high sound velocity or E/.rho. and which is superior in high-pitched tone performance. Conventional, diamond vibration plates which are made overall from crystalline diamond were apt to split or break at a flange due to the high rigidity. According to the present invention periphery of the flange is circularly cut by laser beams to eliminate rugged circumference. The laser treatment also converts the crystalline diamond of the flange into non-diamond carbon. The resulting vibration plate with a central spherical part of crystalline diamond and a periphery of a flange of non-diamond carbon excels both in high frequency property and mechanical strength.

REFERENCES:
patent: 4725345 (1988-02-01), Sakamoto et al.
patent: 4855093 (1989-08-01), Yoshida
patent: 4975318 (1990-12-01), Suda
patent: 4987002 (1991-01-01), Sakamoto et al.
patent: 5043185 (1991-08-01), Murakami et al.
patent: 5180571 (1993-01-01), Hosoya et al.
patent: 5241140 (1993-08-01), Itoh et al.

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