Optical disc apparatus, tracking control method, and...

Details Optical disc apparatus, tracking control method, and... Optical disc apparatus, tracking control method, and...

2007-02-21

2009-11-10

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044410

Reexamination Certificate

active

07616539

ABSTRACT:
An optical disc apparatus has: an optical head400for emitting a light beam onto a predetermined track of an optical disc300before tracking control in order to detect reflected light with a photodetector; an arithmetic circuit130for generating measurement signals each indicative of a time-varying change of light received on a respective one of a plurality of light receiving areas of the photodetector; an A/D converter circuit140for A/D converting each measurement signal; a microcomputer190for determining a correction value based on a difference, in terms of high- and low-frequency components, between measurement signals having been A/D converted; and an adder circuit180for adding the correction value to a driving value output from a tracking control circuit170, so that the driving value is corrected.

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Machine translation of JP11-007639A into English, Aizawa et al.

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