Invention Grant
- Patent Title: Optical pickup device
- Patent Title (中): 光学拾取装置
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Application No.: US12708071Application Date: 2010-02-18
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Publication No.: US08054733B2Publication Date: 2011-11-08
- Inventor: Kenji Nagatomi
- Applicant: Kenji Nagatomi
- Applicant Address: JP Osaka
- Assignee: Sanyo Electric Co., Ltd.
- Current Assignee: Sanyo Electric Co., Ltd.
- Current Assignee Address: JP Osaka
- Agency: Ditthavong Mori & Steiner, P.C.
- Priority: JP2009-036119 20090219
- Main IPC: G11B7/135
- IPC: G11B7/135

Abstract:
An optical pickup device has an astigmatism element, a polarization setting element, and a polarizer. The astigmatism element converges laser light reflected on a disc in a first direction and a second direction to form a first focal line and a second focal line. The polarization setting element makes polarization directions of light fluxes different from each other, the light fluxes being obtained by dividing a light flux of the laser light transmitted through the astigmatism element into two by a straight line parallel to the first direction. The polarizer transmits light having polarization directions obtained by inverting the polarization directions set by the polarization setting element with respect to the straight line parallel to the first direction, respectively.
Public/Granted literature
- US20100208569A1 OPTICAL PICKUP DEVICE Public/Granted day:2010-08-19
Information query
IPC分类: