Invention Grant
- Patent Title: Optical pickup device
- Patent Title (中): 光学拾取装置
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Application No.: US12872276Application Date: 2010-08-31
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Publication No.: US08345528B2Publication Date: 2013-01-01
- 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: JP2009-201936 20090901
- Main IPC: G11B7/00
- IPC: G11B7/00

Abstract:
An optical pickup device includes an objective lens portion which converges laser light at a first focal point and a second focal point; an actuator which positions the first focal point or the second focal point on a recording layer in a disc; an astigmatism element which sets a first focal line position and a second focal line position of the laser light reflected on the disc away from each other in a propagating direction of the laser light; a spectral element which disperses four light fluxes obtained by dividing the laser light reflected on the disc in four from each other; and a photodetector having a sensor group which receives the four light fluxes dispersed by the spectral element.
Public/Granted literature
- US20110051590A1 OPTICAL PICKUP DEVICE Public/Granted day:2011-03-03
Information query
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