Optical pick-up device having light splitting means and focus er

Details Optical pick-up device having light splitting means and focus er Optical pick-up device having light splitting means and focus er

1994-01-06

1995-10-24

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 4441, G11B 709

Patent

active

054612241

ABSTRACT:
In an optical pick-up device, a first photodetector is disposed in such a position as to detect a light beam which is part of a light beam reflected from an optical disk and split in a direction different from a light source direction, and a second photodetector is disposed in the vicinity of the light source so that it can detect a light beam which is the other part of the light beam reflected from the optical disk and split in the light source direction, wherein a tracking control signal and a reproducing signal are detected by the first photodetector and a focusing control signal is detected by the second photodetector.

REFERENCES:
patent: 4667316 (1987-05-01), Suda et al.
patent: 5233444 (1993-08-01), Musha et al.
patent: 5293038 (1994-03-01), Kadowaki et al.
patent: 5317144 (1994-05-01), Oono et al.

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