Optical information reading apparatus

Details Optical information reading apparatus Optical information reading apparatus

1984-04-26

1987-01-06

Wan, Gene

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 44, G01J 120, G11B 2110

Patent

active

046348530

ABSTRACT:
An optical information recording apparatus for reading information recorded on an optically recorded disk in which perpendicularity is maintained between the recording plane of the disk and the optical axis of a reading light beam independently of the operation of a focus servo system. To detect the amount of offset in perpendicularity between the optical axis of the reading light beam and the recording surface, a light-emitting element and a light-detecting element are provided. In accordance with the invention, the path between the light-emitting element and the light-detecting element does not pass through a lens which focuses the reading beam onto the plane of the recording medium.

REFERENCES:
patent: 4381557 (1983-04-01), Jebens

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