发明授权
US07907499B2 Optical element, optical element manufacturing method and optical pickup device
失效
光学元件，光学元件制造方法和光学拾取装置
- 专利标题： Optical element, optical element manufacturing method and optical pickup device
- 专利标题（中）： 光学元件，光学元件制造方法和光学拾取装置
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申请号： US12309495申请日： 2007-07-09
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公开(公告)号： US07907499B2公开(公告)日： 2011-03-15
- 发明人: Osamu Masuda , Masahiro Morikawa , Hiroshi Miyakoshi
- 申请人： Osamu Masuda , Masahiro Morikawa , Hiroshi Miyakoshi
- 申请人地址： JP Tokyo
- 专利权人： Konica Minolta Holdings, Inc.
- 当前专利权人： Konica Minolta Holdings, Inc.
- 当前专利权人地址： JP Tokyo
- 代理机构： Holtz, Holtz, Goodman & Chick, PC
- 优先权： JP2006-203408 20060726
- 国际申请： PCT/JP2007/063657 WO 20070709
- 国际公布： WO2008/013047 WO 20080131
- 主分类号： G11B7/135
- IPC分类号： G11B7/135
摘要：
An optical element includes: opposing surfaces each including two areas each of which includes a fine-periodic structure. The fine-periodic structures of the two areas have different directions from each other in each of the opposing surfaces. One of the opposing surfaces with the fine-periodic structures works as a quarter-wave plate and the other of the opposing surfaces with the fine-periodic structures works as a polarization separating element. A boundary of the two areas in one of the opposing surfaces and a boundary of the two areas in the other of the opposing surfaces are positionally identical.