Optical disk apparatus, and construction of optical disk

Details Optical disk apparatus, and construction of optical disk Optical disk apparatus, and construction of optical disk

1993-08-17

1994-11-15

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4412, 369112, 369110, G11B 7135

Patent

active

053655044

ABSTRACT:
An optical disk apparatus is provided which includes an incident light optical system which causes a light beam, having a wavefront aberration in which an odd function component with respect to two perpendicular axes corresponding to the radial and tangential directions of an optical disk is contained, to impinge on the disk. The apparatus further comprises a light detecting unit divided into at least two regions by a boundary line corresponding to the radial direction of the optical disk for detecting a light beam guided from the disk, and a computing mechanism which outputs a tracking error signal by computing the output differential between these two or more regions.

REFERENCES:
patent: 4797868 (1989-01-01), Ando
patent: 4866688 (1989-09-01), Ohtake et al.
patent: 4956833 (1990-09-01), Kokado et al.
English Language Translation of German Office Action dated May 25, 1993.

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