Optical head device with diffraction grating for separating a li

Details Optical head device with diffraction grating for separating a li Optical head device with diffraction grating for separating a li

1985-06-24

1988-03-22

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01J 120, G11B 709

Patent

active

047330651

ABSTRACT:
An optical head device comprises a light source, condensing optics for condensing a light beam emitted from the light source on an optical recording medium, a photodetector for detecting the light of the light beam reflected from the recording medium, and a beam splitter having a diffraction grating arranged in the optical path of the light beam entering the recording medium from the light source along a plane substantially perpendicular to the optical axis of the incident light beam to cause the light reflected light from the recording medium to be diffracted by the diffraction grating and directed to the photodetector.

REFERENCES:
patent: 3622220 (1971-11-01), Kogelnik
patent: 4358200 (1982-11-01), Heemskerk et al.
patent: 4403318 (1983-09-01), Nagashima et al.
patent: 4409631 (1983-10-01), Matsumoto
patent: 4458980 (1984-07-01), Ohki et al.
patent: 4525625 (1985-06-01), Abe

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