发明名称 |
Optical pickup device and optical disc device |
摘要 |
An optical pickup device is so configured as to change the propagating directions of light fluxes in four light flux areas defined in the periphery of an optical axis of laser light, out of the laser light reflected on a disc, to separate the four light fluxes one from the other. A signal light area where only signal light exists is defined on a detecting surface of a photodetector. Sensors for signal light is disposed at a position in the signal light area to be irradiated by the signal light, and a tracking error signal is generated based on a signal from the sensors. A direct-current component of the tracking error signal resulting from positional displacements of the sensors is cancelled by adjusting a gain of the signal from the sensor. |
申请公布号 |
US8427922(B2) |
申请公布日期 |
2013.04.23 |
申请号 |
US20100690501 |
申请日期 |
2010.01.20 |
申请人 |
MAMIYA NOBORU;HIBINO KATSUTOSHI;NAGATOMI KENJI;SANYO ELECTRIC CO., LTD. |
发明人 |
MAMIYA NOBORU;HIBINO KATSUTOSHI;NAGATOMI KENJI |
分类号 |
G11B7/00 |
主分类号 |
G11B7/00 |
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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