Invention Grant
- Patent Title: Optical pickup device and recording/reproduction device
- Patent Title (中): 光学拾取装置和记录/再现装置
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Application No.: US12541685Application Date: 2009-08-14
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Publication No.: US08238221B2Publication Date: 2012-08-07
- Inventor: Morio Nakatani , Kenji Nagatomi , Yoshiyuki Matsumura , Seiichiro Takahashi
- Applicant: Morio Nakatani , Kenji Nagatomi , Yoshiyuki Matsumura , Seiichiro Takahashi
- 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: JP2007-036939 20070216
- Main IPC: G11B7/00
- IPC: G11B7/00

Abstract:
An optical pickup device includes: a first light source for emitting recording laser light; a second light source for emitting reproducing laser light having a wavelength different from a wavelength of the recording laser light; an objective lens for converging the recording laser light and the reproducing laser light. A quarter wavelength plate is disposed between the first light source and the second light source, and the objective lens. A wavelength-selective polarized beam splitter is disposed between the quarter wavelength plate, and the first light source and the second light source. The reproducing laser light alone out of the recording laser light and the reproducing laser light reflected on recording medium is guided to a photodetector.
Public/Granted literature
- US20090303849A1 OPTICAL PICKUP DEVICE AND RECORDING/REPRODUCTION DEVICE Public/Granted day:2009-12-10
Information query
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