Focusing error detector and optical data detecting device incorp

Details Focusing error detector and optical data detecting device incorp Focusing error detector and optical data detecting device incorp

1987-07-28

1989-03-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 44, G01J 120

Patent

active

048126381

ABSTRACT:
A focusing error detector comprises a light source, a collimator lens for making parallel the pencil of rays emitted by the light source, an objective lens which focuses the parallel pencil of rays to form a beam spot on a data-recording disc with data tracks and guide tracks formed thereon and which receives the pencil of rays reflected from the data-recording disc, an optical system for forming a beam spot from the reflected pencil of rays incident to the objective lens, and an optical detector having a plurality of divided optical sensor blocks for receiving the formed beam spot so as to detect the focusing error of the beam spot formed on the data-recording disc on the basis of the configuration of the received beam spot.

REFERENCES:
patent: 3969573 (1976-07-01), Bouwhuis et al.
patent: 4326800 (1982-04-01), Fitts
patent: 4574369 (1986-03-01), Koide et al.
patent: 4715024 (1987-12-01), Musha
Japanese Abstract #60189723; Scanning Optical Device; 3/9/84; Toshiba.
Japanese Abstract #60241013; Optical Pickup; 5/16/84; Matsushita Denki Sangyo K.K.
Japanese Abstract #59044017; Optical Device; 9/3/82; Canon K.K.

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