Invention Grant
- Patent Title: Quarter-wave plate, and optical pickup device
- Patent Title (中): 四分之一波片和光学拾取装置
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Application No.: US12303314Application Date: 2007-06-04
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Publication No.: US08000210B2Publication Date: 2011-08-16
- Inventor: Makiko Saito , Osamu Masuda
- Applicant: Makiko Saito , Osamu Masuda
- 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: JP2006-158265 20060607
- International Application: PCT/JP2007/061273 WO 20070604
- International Announcement: WO2007/142179 WO 20071213
- Main IPC: G11B7/00
- IPC: G11B7/00
Abstract:
A quarter-wave plate includes a base member including a ridge and trough periodic structure with a structural period of λmin/2
Public/Granted literature
- US20090196152A1 QUARTER-WAVE PLATE, AND OPTICAL PICKUP DEVICE Public/Granted day:2009-08-06
Information query
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