Optical record carrier with surface layer extending to the cente

Details Optical record carrier with surface layer extending to the cente Optical record carrier with surface layer extending to the cente

1988-02-24

1989-08-29

Stephan, Steven L.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specific detail of storage medium support or motion production

369 54, 369280, 369282, G11B 700

Patent

active

048624470

ABSTRACT:
An optical record carrier having a surface layer which includes a substantially circular information track structure, such surface layer extending without interruption substantially up to the center of the track structure. When the record carrier is supported on a rotating turntable and scanned by a scanning beam producing a scanning spot having a width transverse to the track direction of at least a few times the period of the track structure, a diffracted beam is produced by the track structure in a direction transverse to the local track direction. A radiation-sensitive detection system in the path of the diffracted beam produces output signals indicating any centering error between the center of the track structure and the axis of rotation of the turntable. Such signals can be employed to control positioning means to position the record carrier on the turntable so as to eliminate such centering error. Centering is thereby accurately achieved without requiring a center hole or other centering features in the record carrier.

REFERENCES:
patent: 2069827 (1937-02-01), Harrison
patent: 4538258 (1985-08-01), Miyako et al.
patent: 4546465 (1985-10-01), Budinski et al.
patent: 4658393 (1987-04-01), Ohta et al.
patent: 4719615 (1988-01-01), Feyrer et al.
patent: 4780867 (1988-10-01), Lind et al.

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