Optical reading and writing device

Details Optical reading and writing device Optical reading and writing device

1994-02-23

1995-07-04

Epps, Georgia Y.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 54, G11B 700

Patent

active

054306990

ABSTRACT:
The relative tilt of an optical disk and a movable objective lens holder is measured as an output of a differential amplifier which subtracts an output of first photodetectors and which detect the reflected light from optical disk from an output of second photodetectors and which detect the reflected light from a reflector mounted on movable objective lens holder. The signal from differential amplifier is used to tilt movable objective lens holder so that the movable objective lens holder compensates the tilt of optical disk.

REFERENCES:
patent: 4634853 (1987-01-01), Kanamaru
patent: 4780865 (1988-10-01), Yamakawa
patent: 4956833 (1990-09-01), Kokado et al.
patent: 5051975 (1991-09-01), Tadokoro et al.
patent: 5218597 (1993-06-01), Yabe
patent: 5301175 (1994-04-01), Nakamura

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