Optical memory playback apparatus

Details Optical memory playback apparatus Optical memory playback apparatus

1982-02-03

1984-07-17

Popek, Joseph A.

Static information storage and retrieval

Radiant energy

250570, G11C 1300, G06K 710

Patent

active

044609779

ABSTRACT:
An optical memory playback apparatus is constructed so that a single longitudinal mode of laser beam emitted from a self-coupling semiconductor laser element is projected through an optical system onto an information recording medium and the laser beam reflected by the information recording medium is returned through the same optical system back to the semiconductor laser element. In addition, the apparatus interposes a spatially uneven phase plate in the optical system, whereby the longitudinal mode of emission of the semiconductor laser element is converted into a random multi-mode at all times and, consequently, the reproduction of information from the information recording medium is effected by detecting the variation in the intensity of output or terminal voltage of the semiconductor laser element which occurs in conformity with the variation in the intensity of the reflected laser beam.

REFERENCES:
patent: 4190775 (1980-02-01), Sakurai et al.
patent: 4287606 (1981-09-01), Lutes, Jr. et al.

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