US Patent 7876654 Optical disk drive control circuit
Patent 7876654 was granted and assigned to Renesas Technology Corp on January, 2011 by the United States Patent and Trademark Office.
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An IC provided in an optical disk device having an objective lens and a pickup for a disk. The IC has a circuit for holding a signal which drives the objective lens in a focus or tracking direction and for detecting the moving direction of the objective lens, and a circuit for generating a signal which applies an acceleration to the objective lens. When the objective lens passes through a defect on the disk, on the basis of the detected moving direction of the objective lens, the IC applies the acceleration alternately in plus and minus directions to the objective lens to make the objective lens stationary. As a result, after the defect passage, the objective lens can be quickly returned to a focused point or an on-track position and reproducing/recording operation can be resumed.
US Patent 07876654 Optical disk drive control circuit US Patent 7876654 Optical disk drive control circuit
US Patent 07876654 Optical disk drive control circuit
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