Tracking servo system for controllably projecting an optical bea

Details Tracking servo system for controllably projecting an optical bea Tracking servo system for controllably projecting an optical bea

1986-01-30

1988-11-01

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 45, 369119, 369 46, 250201, 250202, G11B 7095

Patent

active

047824743

ABSTRACT:
An optical storage apparatus for storing and reading information on an optical disk with an optical beam, including a tracking servo system having an objective lens, which is driven in a focusing direction F and a tracking direction T by a lens actuator, and a tilting mirror, which is rotated by a mirror actuator. The tracking servo system eliminates beam shift by controlling the lens actuator and the mirror actuator to position the lens and the mirror so that the laser beam always passes through a back focal point of the lens located on the opposite side of the lens from the optical disk. As a result, the laser beam proceeds from the lens to the disk along a path which is parallel with the optical axis of the lens and strikes the disk perpendicularly. Accordingly, the return path of the laser beam reflected by the surface of the disk coincides with the incident path of the laser beam, and no beam shaft is experienced.

REFERENCES:
patent: 4198657 (1980-04-01), Kanamow
patent: 4423496 (1983-12-01), Opheij
patent: 4467463 (1984-08-01), Yano
patent: 4589102 (1986-05-01), Volleau
patent: 4607356 (1986-08-01), Pricot
patent: 4607357 (1986-08-01), Oharo
patent: 4634853 (1987-01-01), Kanamow
Maeda et al., "A Tracking System for Obtaining a Fixed Image on an Optical Disk", Conference Bulletin, Japanese Applied Physics Society, Apr. 1983.
Bricot et al., "Optical Readout of Videodisc", IEEE Transactions on Consumer Electronics, Nov. 1976, p. 304.

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