Optical information processing apparatus

Details Optical information processing apparatus Optical information processing apparatus

1986-10-20

1989-03-21

Stephan, Steven L.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

250201, 346 76L, 369100, 369112, 369116, G11B 700

Patent

active

048150584

ABSTRACT:
An optical information processing device comprises a semiconductor laser, and an optical system including an imaging lens having chromatic aberration for focusing laser light emitted by the semiconductor laser in the form of a spot on an information recording surface. The imaging lens serves for focusing the laser light at different positions along the optical axis for different wavelengths. The information processing device also includes an apparatus for producing relative displacements between the spot and the information recording surface, and an apparatus for varying the wavelength of the light emitted by the semiconductor laser with the device being characterized in that the imaging position of the spot is displaced along the optical axis depending on variations in wavelength of the light emitted by the semiconductor laser and the chromatic aberration of the imaging lens. The focusing control can be effected by driving the wavelength changing apparatus by using focal point detection signals. Further, it is possible to effect multigrade recording by driving the wavelength changing apparatus by multigrade information signals.

REFERENCES:
patent: 4441186 (1984-04-01), Erickson
patent: 4450547 (1984-05-01), Nakamura
patent: 4480325 (1984-10-01), Aiki
patent: 4679057 (1987-07-01), Hamoda
patent: 4725721 (1988-02-01), Nakamura et al.

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