Optical information processing apparatus with peak hold circuit

Details Optical information processing apparatus with peak hold circuit Optical information processing apparatus with peak hold circuit

1991-01-22

1992-04-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 4431, 369 4436, G01J 120

Patent

active

051071010

ABSTRACT:
A peak hold circuit for a gain control signal is disclosed for use with an apparatus for recording information on and/or reproducing information from an optical recording medium by scanning the optical recording medium with a condensed light beam. The apparatus includes an adjusting device for adjusting a focusing and/or tracking condition of the light beam, an error detecting device for detecting a focusing error signal and/or a tracking error signal from light of the light beam reflected or transmitted by the optical recording medium, a feedback control circuit for feeding back an output from the error detecting device to the adjusting device, a light quantity detecting device for detecting light quantity of the reflected or transmitted light, a gain control device for controlling gain of the feedback control circuit in accordance with the output of the light quantity detecting device, and a switching device for selectively switching the ouput of the light quantity detecting device to a hold condition or to a through condition.

REFERENCES:
patent: 4079247 (1978-03-01), Bricot et al.
patent: 4410969 (1983-10-01), Maeda
patent: 4611317 (1986-09-01), Takeuchi et al.
patent: 4683560 (1987-07-01), Takeuchi et al.
patent: 4701603 (1987-10-01), Dakin et al.
patent: 4736354 (1988-04-01), Yoshio
patent: 4769801 (1988-09-01), Funada et al.
patent: 4878211 (1989-10-01), Suzuki et al.

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