发明名称 |
Optical information recording/reproducing apparatus and optical information reproducing apparatus |
摘要 |
In a system of detecting an interference light with a light not irradiated onto an optical disc to increase the S/N ratio, it is difficult to stably acquire a reproduced signal with a simple configuration. Since the recording density is not improved, an improvement in transfer rate is difficult. In an optical information recording/reproducing apparatus where two optical beams face each other and are focused at the same place of a recording medium to record a standing wave developed by interference of the two optical beams, a phase difference of the two optical beams is modulated in a multiple stage and recorded. During reproduction, an interference light of a reproduced light from the recording medium and another reproduction reference light is detected as a reproduced signal, and a phase servo control stabilizing the phase of interference during reproduction by using a low frequency component of the reproduced signal is conducted. |
申请公布号 |
US8659982(B2) |
申请公布日期 |
2014.02.25 |
申请号 |
US20100961571 |
申请日期 |
2010.12.07 |
申请人 |
MIKAMI HIDEHARU;MIYAMOTO HARUKAZU;HITACHI CONSUMER ELECTRONICS CO., LTD. |
发明人 |
MIKAMI HIDEHARU;MIYAMOTO HARUKAZU |
分类号 |
G11B20/00;G11B7/00;G11B7/135;G11B27/36 |
主分类号 |
G11B20/00 |
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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