Dynamic information storage or retrieval – Dynamic mechanism subsystem – Specified detail of transducer assembly support structure
Patent
1984-05-11
1986-04-01
Stephan, Steven L.
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Specified detail of transducer assembly support structure
G11B 338
Patent
active
045802580
ABSTRACT:
Apparatus for correcting or compensating for the tracking error of the pivotally mounted (1) tone arm (23) of a phonograph includes a first intermediate member (9) to which said tone arm (23) is pivotally (1) connected, a second intermediate member (12) which is rotatably connected to the first intermediate member (9) by a belt (18) and pulleys (13) which are sized in such a way that a photodiode source (21) and a photodiode detector (22) both carried by the second intermediate member (12) will tend to be indirectly moved by a motor to maintain them substantially constantly in register with a point on the tone arm (23). A slotted mask (24) carried by the tone arm (23) is interposed between the source (21) and the detector (22) and its slot defines a central "null" position in which said motor will not be driven when the required relationship exists. Deviation in either direction will cause the motor to be driven to re-establish this relationship. An insignificant maximum tracking error below 0.1.degree. can readily be attained. Other constructions in which the second intermediate member (12) is omitted and in which the means to control operation of the motor are differently constructed and arranged are described and illustrated.
REFERENCES:
patent: 2006605 (1935-07-01), Putnoky
patent: 3059934 (1962-10-01), Urmenyi
patent: 3313546 (1967-04-01), Yoshikawa
patent: 3476394 (1969-11-01), Birch
patent: 3813100 (1974-05-01), Meyer
patent: 3826505 (1974-07-01), Birch
patent: 3920249 (1975-11-01), Birch
patent: 3924860 (1975-12-01), Saito
patent: 4153256 (1979-05-01), Guha
patent: 4316280 (1982-02-01), Kanchev
patent: 4346466 (1982-08-01), Kanchev
patent: 4497053 (1985-01-01), Wolff
Berks Robert S.
Dinsdale Jack
Cranfield Institute of Technology
Elite Townshend, Ltd.
Stephan Steven L.
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