发明名称 |
Optical pickup device and optical disk device having a diffraction element so that a first light beam and a second light beam comport with each other |
摘要 |
An optical pickup device is adapted to read information signals from optical recording media of two different types such as a "DVD" and a "CD" for which two light beams with different wavelengths are used and comprises a photodetector having a single light receiving section that can be shared by optical recording media of two different types. Both the light beam reflected from the signal recording surface of the "DVD" 106 a and the light beam reflected from the signal recording surface of the "CD" 106 b are diffracted by the diffraction element 6 and focused to a same spot on the light receiving surface of the photodiode of a photodetector 7.
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申请公布号 |
US7443780(B2) |
申请公布日期 |
2008.10.28 |
申请号 |
US20050288101 |
申请日期 |
2005.11.29 |
申请人 |
SONY CORPORATION |
发明人 |
YUKAWA HIROAKI |
分类号 |
G02B5/18;G11B7/00;G11B7/125;G11B7/135 |
主分类号 |
G02B5/18 |
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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