Optical scanning device using a plurality of scanning spots

Details Optical scanning device using a plurality of scanning spots Optical scanning device using a plurality of scanning spots

1993-06-09

1998-12-29

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4441, 369 4437, G11B 700

Patent

active

058547800

ABSTRACT:
An optical scanning device using one or more rows of scanning spots for simultaneously scanning a plurality of information tracks of an optical record carrier. The resulting radiation produced from the respective spots is imaged on respective photodetectors, and the detection signals from a plurality of the photodetectors are used to derive focus error and tracking error signals for the corresponding scanning spots. Error signals of the same type are then combined to derive servo control signals for respectively controlling focus and tracking of all scanning spots. The focus error signals can also be combined to derive further servo control signals for controlling tilt of the record carrier and tracking angle. Derivation of the servo control signals from error signals corresponding to a plurality of the scanning spots achieves improved immunity against the effects of dust or other artifacts on the surface of the record carrier.

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