发明名称 |
Astigmatism generating device to remove comma aberration and spherical aberration |
摘要 |
An optical pickup device includes a photodetector divided into four light-receiving elements by two dividing lines, an incident optical system for irradiating a light beam onto an optical recording medium, and a receiving optical system for guiding a return light from the optical recording medium to the photodetector, wherein the receiving optical system includes astigmatism generating means for generating astigmatism having an astigmatism axis at an angle of 45 degree with respect to the two dividing lines.
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申请公布号 |
US6445668(B2) |
申请公布日期 |
2002.09.03 |
申请号 |
US19980085229 |
申请日期 |
1998.05.27 |
申请人 |
PIONEER CORPORATION |
发明人 |
SUGIURA SATOSHI;TACHIBANA AKIHIRO;KUBOTA YOSHIHISA |
分类号 |
G02B5/32;G02B13/00;G11B7/00;G11B7/09;G11B7/135;H01L31/02;(IPC1-7):G11B7/00 |
主分类号 |
G02B5/32 |
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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