Optical information recording/reproducing apparatus

Details Optical information recording/reproducing apparatus Optical information recording/reproducing apparatus

1987-09-10

1988-12-06

Sikes, William L.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 44, 369 54, 250201, G11B 700, G11B 509, G01J 120

Patent

active

047899743

ABSTRACT:
In an optical information recording/reproducing apparatus for recording/reproducing information on or from an optical disc, a laser beam is focused on the surface of a substrate of the optical disc so that the intensity or a high frequency component of a reflected laser beam is used to detect contaminants on the optical disc surface or a test signal containing a plurality frequency components and recorded on a specified track on the optical disc is reproduced and detected so that the difference between amplitudes of the frequency components is used to detect contaminants on the optical disc surface. Scattering of the laser beam can be prevented and recording/reproducing can be effected with a proper level of laser power.

REFERENCES:
patent: 4286318 (1981-08-01), Immink et al.
patent: 4363961 (1982-12-01), Okada et al.
patent: 4417330 (1983-11-01), Hazel et al.
patent: 4613961 (1986-09-01), Aarts

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