Invention Grant
- Patent Title: Optical pickup apparatus, optical recording medium driving apparatus, and signal recording/reproducing method
- Patent Title (中): 光拾取装置,光记录介质驱动装置和信号记录/再现方法
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Application No.: US12192605Application Date: 2008-08-15
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Publication No.: US08059504B2Publication Date: 2011-11-15
- Inventor: Taku Tsuboi , Eiichi Ueda
- Applicant: Taku Tsuboi , Eiichi Ueda
- Applicant Address: JP Tokyo
- Assignee: Sony NEC Optiarc Inc.
- Current Assignee: Sony NEC Optiarc Inc.
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2007-253423 20070928
- Main IPC: G11B5/09
- IPC: G11B5/09

Abstract:
An optical pickup apparatus capable of irradiating an optical recording medium having a plurality of recording layers on which a signal is recorded with laser light includes a light source emitting the laser light, a light-concentrating element concentrating the laser light emitted from the light source on the optical recording medium, a phase difference element having a region divided into at least two regions which the laser light reflected by the optical recording medium enters and producing a phase difference between first light and second light reflected by a non-target layer which is not a target of recording or reproduction of the signal out of the plurality of recording layers and entering the at least two regions such that the first and the second light weaken each other, and a photodetector receiving the laser light emitted from the phase difference element.
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