Apparatus for correcting photodetector signals in a system for r

Details Apparatus for correcting photodetector signals in a system for r Apparatus for correcting photodetector signals in a system for r

1988-11-16

1989-12-26

Richardson, Robert L.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 46, 369107, 369116, G11B 700

Patent

active

048902721

ABSTRACT:
A system capable of retrieving, recording or erasing information from an optical recording medium such as an optical disk or card. Two or more light beams reflected from the optical memory are detected by a photodetector. A correction circuit processes the photoelectric signals received from the photodetector to correct for the effect of other than one light beam on the focusing of the system on the optical recording medium.

REFERENCES:
patent: 4150402 (1979-04-01), Tietze et al.
patent: 4283785 (1981-08-01), Miyauchi et al.
patent: 4516235 (1985-05-01), Tarzaiski
patent: 4538257 (1985-08-01), Klinger
patent: 4648085 (1987-03-01), Shimonou
patent: 4682315 (1987-07-01), Uejima

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