Optical head carriage, tracking mechanism and displacement detec

Details Optical head carriage, tracking mechanism and displacement detec Optical head carriage, tracking mechanism and displacement detec

1992-08-12

1994-06-14

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4416, 369 4432, 369 54, G11B 7095

Patent

active

053216784

ABSTRACT:
An optical data recording and reproducing apparatus including an objective lens holder which holds an objective lens for converging laser light onto an optical disc, a tracking mechanism which drives the objective lens holder in a tracking direction of the optical disc, and a displacement detecting mechanism which detects the displacement of the objective lens holder effected by the tracking mechanism. The displacement detecting mechanism has photosensors which have light emitters and light receivers. The light receivers are located further from the optical disc than the light emitters. The photosensors are supported on a single sensor holder.

REFERENCES:
patent: 4769803 (1988-09-01), Yamamiya
patent: 4855982 (1989-08-01), Orlicki et al.
patent: 4868377 (1989-09-01), Nishikawa
patent: 4956833 (1990-09-01), Kokado et al.
patent: 5078471 (1992-01-01), Takishima
patent: 5103345 (1992-04-01), Watanabe et al.
patent: 5150346 (1992-09-01), Minakuchi
patent: 5216648 (1993-06-01), Noda et al.

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