Optical disk apparatus for controlling second optical beam based

Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium

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364 4411, 364 4432, 364 4428, G11B 700

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active

050864190

ABSTRACT:
When a light beam of a reference optical head correctly tracks on the center of a proper track, deviation, due to an optical head assembling error or an optical disk eccentrically, of a light beam of a non-reference optical head from the center of said proper track is memorized in advance as bias information. At a time of a seek control or a track lump control, the non-reference optical head is controlled to move along a track with said bias information, so that not only the reference optical head but also the non-reference optical head correctly track on the proper aimed track, when a seek control or a track jump control is performed. This invention enables both the light beam of the reference optical head and the light beam of the non-reference optical head to correctly track on a proper track without being affected by neither any optical head assembling error nor any optical disk eccentricity.

REFERENCES:
patent: 4841502 (1989-06-01), Murakami et al.
patent: 4873679 (1989-10-01), Murai et al.

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