发明名称 |
Optical reproduction apparatus |
摘要 |
An optical reproduction apparatus in accordance with the present invention has a gain control circuit for controlling a gain of an amplifier circuit which amplifies a reproduction signal in accordance with amplitudes of the reproduction signal from an optical recording medium. The amplitude is sent to a power control calculation circuit which controls the reproduction power of a light beam in accordance with the amplitude. The gain control circuit has a slower response speed than that of the power control circuit at least during a period when the power control circuit controls the reproduction power. This allows to provide an optical reproduction apparatus that can realize the stable reproduction power and automatic gain control even to the unevenness of the amplitudes of the reproduction signal.
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申请公布号 |
US6771576(B2) |
申请公布日期 |
2004.08.03 |
申请号 |
US20010833405 |
申请日期 |
2001.04.11 |
申请人 |
SHARP KABUSHIKI KAISHA |
发明人 |
OKUMURA TETSUYA;MAEDA SHIGEMI |
分类号 |
G11B7/005;G11B7/007;G11B7/125;G11B11/105;G11B20/10;(IPC1-7):G11B7/00 |
主分类号 |
G11B7/005 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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