Record player

Details Record player Record player

1979-04-02

1980-07-29

Shepperd, John W.

Undertaking

274 13R, G11B 310

Patent

active

042147565

ABSTRACT:
A record player includes an electro-magnetic member for applying to its tone arm an outside force which is varied to effectively cancel the inside force generated when the stylus located on the tone arm rides upon a rotating record disc. The record player further includes a detecting device for detecting the rotational position of the tone arm, and a computer which, as a function of the rotational position of the tone arm determined from a detecting signal supplied by the detecting device, generates an outside force control voltage which is sufficient, when supplied to the electro-magnetic member, to cancel the inside force. An additional electro-magnetic member may be used to apply a stylus pressure to the tone arm in response to a stylus pressure control voltage. The outside force control voltage may also be varied as a function of such a stylus pressure control voltage.

REFERENCES:
patent: 3492006 (1970-01-01), Shimoda et al.
patent: 3779563 (1973-12-01), Irisana
patent: 3937476 (1976-02-01), Sakai
patent: 4076258 (1978-02-01), Wren
patent: 4132935 (1979-01-01), Gans et al.
patent: 4138121 (1979-02-01), Nakajima et al.

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