发明名称 |
Diffractive optical element, objective optical system including the same, and optical pickup including the same |
摘要 |
A diffractive optical element includes a first optical part and a second optical part bonded to each other with a bonded surface therebetween configured as a diffraction surface. In this diffractive optical element, the diffraction order of diffracted light with the largest quantity of light out of diffracted light for one of a plurality of kinds of laser beams obtained on the diffraction surface is different from the diffraction order for at least another laser beam.
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申请公布号 |
US7801008(B2) |
申请公布日期 |
2010.09.21 |
申请号 |
US20070797209 |
申请日期 |
2007.05.01 |
申请人 |
PANASONIC CORPORATION |
发明人 |
TANAKA YASUHIRO;YAMAGATA MICHIHIRO;HAYASHI KATSUHIKO |
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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