Track jump servo system for disc player

Details Track jump servo system for disc player Track jump servo system for disc player

1981-09-28

1984-04-17

Stephan, Steven L.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 33, G11B 1706

Patent

active

044438699

ABSTRACT:
An apparatus is provided for randomly accessing data in a data retrieval system which utilizes a disc-shaped record medium. Information is stored in a plurality of tracks on the surface of the record medium. When the readout transducer is to be moved from its present read position (e.g., track #1,000) to a new read position (e.g., track #2,000), the difference in the number of tracks in the new position and the present position is loaded into a counter. As the transducer is moved across the disc surface the number of track crossings is counted and compared to the number loaded into counter. Even though the read head is moving outward, for example, eccentricities in the tracks will cause the head to "see" both "in" and "out" crossings, the number of actual tracks crossed will be equal to the number of "out" crossings minus the number of "in" crossings. When the number of track crossings is equal to the number in the counter, the transducer will be enabled to follow the desired track.

REFERENCES:
patent: 4106058 (1978-08-01), Romeos et al.
patent: 4138663 (1979-02-01), Lehureau et al.
patent: 4160270 (1979-07-01), Goldschmidt et al.
patent: 4222071 (1980-09-01), Bell et al.

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