Optical disk apparatus and track access control method utilizing

Details Optical disk apparatus and track access control method utilizing Optical disk apparatus and track access control method utilizing

1996-02-27

1998-04-07

Neyzari, Ali

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 13, G11B 1722, G11B 1100

Patent

active

057372829

ABSTRACT:
An optical disk apparatus includes first and second objective lenses, a carriage, a moving mechanism, a fixed optical system, a main control section, track access control circuits, a first positional shift correction circuit, a second positional shift correction circuit, first and second driving members, an arithmetic circuit, and a correction member. The first and second driving members slightly drive the first and second objective lenses in a track crossing direction in accordance with the first and second positional shift correction signals, respectively. The first and second positional shift correction circuits count first and second track position signals to output first and second positional error signals with respect to a target track, and output the first and second positional shift correction signals to the first and second driving members based on the first and second positional error signals and the first and second track position signals, respectively. The arithmetic circuit calculates a difference between the first and second positional error signals to output an inter-beam positional shift signal. The correction member corrects one of the first and second positional shift correction signals based on the inter-beam positional shift signal.

REFERENCES:
patent: 4802021 (1989-01-01), Makagawa et al.
patent: 4845696 (1989-07-01), Ohtsuki et al.
patent: 5237547 (1993-08-01), Ohkuma et al.

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