Focus control device

Details Focus control device Focus control device

1985-10-29

1987-09-01

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250237R, 369 45, G01J 120, G01J 124, G11B 700, G11B 2022

Patent

active

046910980

ABSTRACT:
A focus control device comprises a light source; a recording medium on which light from the light source is focused; an objective lens for focusing light from the light source on the recording medium; a light receiving element for receiving the light reflected from the recording medium; an optical unit disposed in the optical path of the reflected light; and a beam splitter for separating the reflected light from an incident light path to the recording medium. The optical unit comprises absorbing parts adapted to absorb a part of the reflected light and transmitting parts adapted to transmit a part of said reflected light, and the absorbing parts forming a predetermined angle with respect to the optical axis of the reflected light.

REFERENCES:
patent: 4504938 (1985-03-01), Tajima
patent: 4525625 (1985-06-01), Abe

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