Invention Grant
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
- Patent Title: Optical element, optical element manufacturing method and optical pickup device
- Patent Title (中): 光学元件，光学元件制造方法和光学拾取装置
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Application No.: US12309495Application Date: 2007-07-09
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Publication No.: US07907499B2Publication Date: 2011-03-15
- Inventor: Osamu Masuda , Masahiro Morikawa , Hiroshi Miyakoshi
- Applicant: Osamu Masuda , Masahiro Morikawa , Hiroshi Miyakoshi
- Applicant Address: JP Tokyo
- Assignee: Konica Minolta Holdings, Inc.
- Current Assignee: Konica Minolta Holdings, Inc.
- Current Assignee Address: JP Tokyo
- Agency: Holtz, Holtz, Goodman & Chick, PC
- Priority: JP2006-203408 20060726
- International Application: PCT/JP2007/063657 WO 20070709
- International Announcement: WO2008/013047 WO 20080131
- Main IPC: G11B7/135
- IPC: G11B7/135
Abstract:
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.
Public/Granted literature
- US20100002299A1 Optical Element, Optical Element Manufacturing Method and Optical Pickup Device Public/Granted day:2010-01-07
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