Pick-up device for use in an optical information recording syste

Details Pick-up device for use in an optical information recording syste Pick-up device for use in an optical information recording syste

1989-03-30

1991-09-17

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369107, 369 4414, G11B 700

Patent

active

050501550

ABSTRACT:
A pick-up device which includes a light source and a condenser lens for effecting recording and reproduction of information by projecting a light beam as collected by the condenser lens onto a recording medium. A diffraction grating is provided between the light source and the condenser lens for dividing light returning from the recording medium by a diffraction grating so as to be directed to a photo-detector, to thereby obtain an optical detection signal.

REFERENCES:
patent: 3680945 (1972-08-01), Sheridon
patent: 3876841 (1975-04-01), Kramer
patent: 4403318 (1963-09-01), Nagashima et al.
patent: 4484072 (1984-11-01), Matsumura
patent: 4624526 (1986-11-01), Tsukai et al.
patent: 4832464 (1989-05-01), Kato et al.
patent: 4937808 (1990-06-01), Shimada et al.
Published Japanese Abstract for Japanese Patent No. 60-182,526, vol. 10, No. 34 (P-427) (2091).

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