Invention Grant
US08174952B2 Light source unit, optical detector unit, optical pickup device, and optical disk device
失效
光源单元，光学检测器单元，光学拾取装置和光盘装置
- Patent Title: Light source unit, optical detector unit, optical pickup device, and optical disk device
- Patent Title (中): 光源单元，光学检测器单元，光学拾取装置和光盘装置
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Application No.: US12094569Application Date: 2006-11-20
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Publication No.: US08174952B2Publication Date: 2012-05-08
- Inventor: Junichi Kitabayashi , Takeshi Miki
- Applicant: Junichi Kitabayashi , Takeshi Miki
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Ltd.
- Current Assignee: Ricoh Company, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Dickstein Shapiro LLP
- Priority: JP2005-336097 20051121; JP2006-012763 20060120
- International Application: PCT/JP2006/323529 WO 20061120
- International Announcement: WO2007/058389 WO 20070524
- Main IPC: G11B7/135
- IPC: G11B7/135 ; G11B7/20
Abstract:
A light source unit comprises a plurality of light sources emitting a plurality of light beams. A plurality of volume hologram elements are provided for the plurality of light sources respectively, each volume hologram element having a plane of incidence of an incoming light beam and a plane of outgoing radiation of a diffracted light beam which are perpendicular to each other, the plurality of volume hologram elements having mutually different Bragg conditions in which an optical intensity of a diffracted light beam is set to a maximum.
Public/Granted literature
- US20090046562A1 LIGHT SOURCE UNIT, OPTICAL DETECTOR UNIT, OPTICAL PICKUP DEVICE, AND OPTICAL DISK DEVICE Public/Granted day:2009-02-19
Information query
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