发明名称 |
OPTICAL INFORMATION REPRODUCTION DEVICE AND OPTICAL INFORMATION REPRODUCTION METHOD |
摘要 |
An optical information recording/reproduction device is capable of appropriately correcting the angle of a reference beam during data reproduction even when a wavelength deviation or an angle deviation in multiplexing and vertical directions of the reference beam occurs in a holographic memory recording medium. The optical information reproduction device has a laser light source that generates a reference beam; an image-capturing unit that detects a diffraction ray to be reproduced from the optical information recoding medium; and an optical detection unit that has at least two light-receiving surfaces and is used for detecting a diffraction ray reproduced by irradiating the reference beam on the optical information recording medium. The device also has a light-shielding unit that shields part of the diffraction ray detected by the optical detection unit; and an error signal calculation unit that generates an error signal from a detection signal outputted by the optical detection unit. |
申请公布号 |
US2016055876(A1) |
申请公布日期 |
2016.02.25 |
申请号 |
US201314781676 |
申请日期 |
2013.04.08 |
申请人 |
HITACHI, LTD. |
发明人 |
HOSAKA Makoto |
分类号 |
G11B7/0065;G11B7/1353;G11B20/10 |
主分类号 |
G11B7/0065 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
Tokyo JP |