Invention Grant
US08149677B2 Optical pickup unit and optical disk apparatus having a phase-differing periodic structure
失效
具有相位不同周期性结构的光学拾取单元和光盘装置
- Patent Title: Optical pickup unit and optical disk apparatus having a phase-differing periodic structure
- Patent Title (中): 具有相位不同周期性结构的光学拾取单元和光盘装置
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Application No.: US11549921Application Date: 2006-10-16
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Publication No.: US08149677B2Publication Date: 2012-04-03
- Inventor: Ryoichi Kawasaki , Yoshitaka Hotta
- Applicant: Ryoichi Kawasaki , Yoshitaka Hotta
- Applicant Address: JP Osaka JP Tokyo
- Assignee: Sanyo Electric Co., Ltd.,Sanyo Optec Design Co., Ltd.
- Current Assignee: Sanyo Electric Co., Ltd.,Sanyo Optec Design Co., Ltd.
- Current Assignee Address: JP Osaka JP Tokyo
- Agency: Fish & Richardson P.C.
- Priority: JP2005-301588 20051017; JP2006-138953 20060518
- Main IPC: G11B7/135
- IPC: G11B7/135 ; G11B7/00
Abstract:
An optical pickup unit comprises a diffraction grating that divides light into at least three luminous fluxes and condenses the three luminous fluxes to apply at least three focusing spots, independent of each other, onto a signal side of a medium. The diffraction grating is divided into at least four regions, a first region, a second region, a third region, and a fourth region.
Public/Granted literature
- US20090022032A1 Optical Pickup Unit and Optical Disk Apparatus Public/Granted day:2009-01-22
Information query
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