Optical disk apparatus and its reproducing method

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 8625399
APP PUB NO 20130039159A1
SERIAL NO

13652258

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Abstract

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Amplitude and frequency of a high-frequency signal superposed on a reproduction laser beam are changed in accordance with a reproduction spot diameter on the surface of the recording layer upon discrimination of an optical disk in initial adjustment after insertion of the optical disk and change of a layer of a multi-layer optical disk. Further, the high-frequency signal is not superposed on the reproduction laser beam until end of the discrimination and change to a target layer upon discrimination of the optical disk and change of a layer of a multi-layer optical disk.

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Patent Owner(s)

  • HITACHI CONSUMER ELECTRONICS CO., LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Inoue, Masayuki Yokohama, JP 213 1992
Nishimura, Koichiro Yokohama, JP 66 230

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