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

1986-11-10

1989-07-18

Shaw, Clifford C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

369100, G11B 712

Patent

active

048498254

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), Sheridan
patent: 4403318 (1963-09-01), Nagashima et al.
patent: 4484072 (1984-11-01), Matsumura
patent: 4624526 (1986-11-01), Tsukai et al.
patent: 4665310 (1987-05-01), Heemskerk
Published Japanese Abstract for Japanese Patent No. 60-182526, vol. 10, No. 34, (P-427) (2091).

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