Gain control of a reproduced signal amplifier for precise monito

Details Gain control of a reproduced signal amplifier for precise monito Gain control of a reproduced signal amplifier for precise monito

1998-09-18

2000-08-22

Dinh, Tan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369107, 369 4432, 36912412, G11B 700

Patent

active

061082937

ABSTRACT:
An optical disk recording device for conducting reading and recording of data through irradiation of laser beam on an optical disk medium comprises a photo detection circuit for receiving input of reflected light from an optical disk medium to detect a reproduced signal, a pre-amplifier for amplifying a reproduced signal from the photo detection circuit and outputting the amplified reproduced signal for monitoring, and a level shift circuit for shifting a level of a reproduced signal from the photo detection circuit increased with an increase of the amount of light in data recording operation to a preset value and outputting the level-shifted reproduced signal to the pre-amplifier.

REFERENCES:
patent: 4378490 (1983-03-01), d'Auria Luigi
patent: 5193083 (1993-03-01), Yanagawa
patent: 5228063 (1993-07-01), Zucker
patent: 5570335 (1996-10-01), Ogata et al.

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