Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1982-07-19
1985-06-04
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
369 45, G01J 136, G11B 700
Patent
active
045216800
ABSTRACT:
An optical head of the present invention is provided with an optical system including an objective lens, and a photodetector. A laser beam incident on the objective lens is converged thereby and projected on a light-reflecting layer. The laser beam reflected by the light-reflecting layer is transferred to a light receiving surface of the photodetector through the optical system including the objective lens. The light receiving surface includes two photosensitive regions and a photoinsensitive region arranged between the two photosensitive regions and detecting no substantial light rays. While the objective lens is kept in the just focusing state, most of light rays are projected on the photoinsensitive region, and low level current is generated from the photodetector. If the objective lens is in defocusing state, the laser beam is projected toward one of the photosensitive regions, and a high level current is generated from the photodetector.
REFERENCES:
patent: 3969576 (1976-07-01), Boonstra et al.
patent: 4079248 (1978-03-01), Lehureau et al.
patent: 4097730 (1978-06-01), Korpel
patent: 4422168 (1983-12-01), Ito et al.
Tokyo Shibaura Denki Kabushiki Kaisha
Westin Edward P.
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