Optical head assembly for optical information player

Details Optical head assembly for optical information player Optical head assembly for optical information player

1994-07-25

1996-06-11

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, 369 4437, 2502015, G11B 709

Patent

active

055263305

ABSTRACT:
An optical head assembly for an optical information reading and reproducing apparatus including a laser for emitting a laser beam directed so as to impinge upon an information carrier disc. Rays of light reflected from the information carrier disc is separated into a reproduction signal detecting beam and two servo signal detecting beams by a path separator prism. The reproduction signal detecting beam enters a reproduction signal detector while the servo signal detecting beams enter an image sensor. The image sensor is so positioned as to cause images of the light beams to assume a substantially equal size. By selecting pixels effective to properly detect focusing and tracking errors, various servo signals can be obtained in dependence on outputs from those pixels selected.

REFERENCES:
patent: 4987292 (1991-01-01), Howard
patent: 5166506 (1992-11-01), Fiete et al.
patent: 5210730 (1993-05-01), Hayashi et al.

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