Optical pickup device

Details Optical pickup device Optical pickup device

1989-04-21

1991-10-15

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, G11B 1722

Patent

active

050580914

ABSTRACT:
An optical pickup device includes a light source for emitting light beam onto a recording medium. A lens is provided in an optical path between the light source and the recording medium. The lens converges the light beam to create a focusing spot on the recording medium. A tracking error detector receives a light beam reflected from the recording detector also receives a reflected light beam to detect a focusing error. A controller receives an output from the tracking error detector and the focusing error detector to produce a tracking error correction signal and a focusing error correction signal. A deflection angle adjuster is provided in the optical path and is responsive to the tracking error correction signal. The angle adjuster adjusts a deflection angle of the light beam. A refractive index adjuster is provided in the optical path and is responsive to the focusing error correction signal. The refractive index adjuster adjusts a refractive index of the light beam.

REFERENCES:
patent: 4853919 (1989-08-01), Miyawaki et al.
patent: 4855986 (1989-08-01), Taki
patent: 4910723 (1990-03-01), Yamamoto

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