Light spot positioning method and optical disc memory apparatus

Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system

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369 4431, 369 4432, 369 56, 369 4411, 369 4413, 369 4434, 369 32, G11B 700

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053964772

ABSTRACT:
A light spot positioning method and apparatus for performing a seek operation of positioning a record/playback light spot at a desired track on a recording medium by a macro moving mechanism for an optical head and a micro moving mechanism mounted on the optical head or the base of the apparatus, and for selecting the bandwidth of the control servo of the micro moving mechanism to be higher than 10 KHz during a track pull-in operation. By selecting the bandwidth of control servo of the micro moving mechanism higher than 10 KHz, the track can be pulled in with the relative velocity between the track and the light spot remaining high. During a track following operation after the completion of the track access, the band of the control servo of the micro moving mechanism is changed to a low level of lower than 5 KHz.

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