Dome speaker with cut-out portions in the voice coil bobbin

Details Dome speaker with cut-out portions in the voice coil bobbin Dome speaker with cut-out portions in the voice coil bobbin

1985-02-28

1986-05-27

Rubinson, Gene Z.

1791155VC, 179181R, H04R 904, H04R 718, H04R 906

Patent

active

045916675

ABSTRACT:
A structure for a dome speaker includes a dome-shaped diaphragm formed of a high rigidity material and having an outer periphery, a voice coil bobbin secured at a top end thereof to the outer periphery of the diaphragm, a voice coil mounted about the bobbin, and a variation means in the bobbin for varying the resonance conditions of the diaphragm. The variation means includes at least one cut-out portion provided at the top end of the bobbin and a sheet which closes the cut-out portion. Preferably, the diaphragm is made of a nitrified titanium alloy and the sheet is made from a material softer than the bobbin. The cut-out portion may have a width from about 7 to about 50 percent of the total circumferential length of the bobbin.

REFERENCES:
patent: 2769942 (1956-11-01), Hassan
patent: 3193627 (1965-07-01), Hecht
patent: 3792394 (1974-02-01), Bertagni
patent: 4057694 (1977-11-01), Obuchi
patent: 4118605 (1978-10-01), Kobayashi
patent: 4225757 (1980-09-01), Babb

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