Apparatus for detecting position of a reproducing transducer in

Details Apparatus for detecting position of a reproducing transducer in Apparatus for detecting position of a reproducing transducer in

1981-07-28

1984-06-05

Stephan, Steven L.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Having power driven transducer assembly

369220, 369233, 369243, G11B 308, G11B 338

Patent

active

044532458

ABSTRACT:
An apparatus for detecting position of a reproducing transducer in a rotary recording medium reproducing apparatus which reproduces an information signal recorded in a rotary recording medium by a reproducing transducer which is transferred towards the radial direction of the rotary recording medium, comprises a single photo-detector having a light-emitting element and a light-receiving element, provided in a manner so as to be transferred unitarily with the reproducing transducer, a light interrupting plate provided at a fixed part of the rotary recording medium reproducing apparatus, for operating together with the photo-detector, and a position detection signal producing circuit for producing a position detection output signal according to an output of said photo-detector, to indicate that the reproducing transducer has passed a position corresponding to the outermost peripheral position and the innermost peripheral position of the recorded region in the rotary recording medium. The light interrupting plate has a configuration so as to change state between a light interrupting state and a non-interrupting state with respect to the photo-detector, as the reproducing transducer passes a position corresponding to an outermost peripheral position and an innermost peripheral position of a recorded region in the rotary recording medium.

REFERENCES:
patent: 3485332 (1969-12-01), Heim
patent: 3993315 (1976-11-01), Hansen et al.
patent: 4135086 (1979-01-01), Baba
patent: 4322840 (1982-03-01), Kusaka

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