Mechanical sound reproducing means for an audio-visual device

Details Mechanical sound reproducing means for an audio-visual device Mechanical sound reproducing means for an audio-visual device

1974-06-05

1976-12-28

Stephan, Steven L.

Optics: image projectors

With sound accompaniment

Common picture and sound record carrier system

274 1A, 274 9R, 274 23R, G11B 2504, G03B 3106

Patent

active

039998452

ABSTRACT:
A tone-arm generally in the form of a unitary right-angle member has first and second arms extending at approximately 90.degree. to each other. A needle is supported by one of the arms, the other arm being connected to a stem which is in turn connected to the speaker diaphram for vibrating the latter when the tone-arm is vibrated in its own plane as a consequence of the needle engaging the grooves of a phonograph record. A fulcrum supports the tone-arm for pivoting movement in its own plane; this fulcrum also permits the arm supporting the needle to move in a second plane parallel with the record. Spring means hold the tone-arm in engagement with the fulcrum and at the same time maintain the needle in engagement with the record. A camming means operated by advancing mechanism for a transparency holder separates the needle from the record during indexing of the needle to the separate successive messages on the record. The speaker diaphram is supported by special mounting means to permit large bodily movements of the diaphram occasioned by separation of the needle from the record.

REFERENCES:
patent: 3466050 (1969-09-01), Sindlinger
patent: 3484160 (1969-12-01), Glass et al.
patent: 3589735 (1971-06-01), Watanabe
patent: 3664673 (1972-05-01), Weiss et al.
patent: 3667765 (1972-06-01), Watanabe
patent: 3782732 (1974-01-01), Summerfield

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