Record carrier scanning apparatus wherein the scanning head is p

Details Record carrier scanning apparatus wherein the scanning head is p Record carrier scanning apparatus wherein the scanning head is p

1992-09-28

1994-06-14

Pascal, Robert J.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4428, 360 7806, G11B 1722, G11B 700

Patent

active

053216768

ABSTRACT:
Scanning apparatus for a disc-shaped record carrier having a spiral track, the apparatus including a scanning head arranged on a slide which is radially displaceable with respect to the record carrier. The scanning point produced by the scanning head is maintained on the track by a tracking control system which includes a fine positioning device secured to the slide and which radially displaces the scanning point within a predetermined limited range of displacement determined by the positioning of the fine-positioning device with respect to the slide. A position-indication signal (PS) indicative of such position is generated, and a control unit detects when such signal exceeds a predetermined limit value. In that event, the control unit energizes a driving motor of the radial displacement device by supplying an energizing pulse pattern thereto which causes displacement of the slide to a position at which the position-indication signal returns to a value below the limit value. The energizing pulse pattern is adjusted by the control unit so that the displacement of the fine-positioning device in response thereto remains within predetermined limits and/or is symmetrical about a central position of such device relative to the slide.

REFERENCES:
patent: 4899325 (1990-02-01), Katsuhara et al.

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