Invention Grant
US08427923B2 Optical pickup device, optical disc device and focus adjusting method
失效
光拾取装置,光盘装置和聚焦调整方法
- Patent Title: Optical pickup device, optical disc device and focus adjusting method
- Patent Title (中): 光拾取装置,光盘装置和聚焦调整方法
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Application No.: US12844245Application Date: 2010-07-27
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Publication No.: US08427923B2Publication Date: 2013-04-23
- Inventor: Satoshi Kanai , Kenji Nagatomi
- Applicant: Satoshi Kanai , Kenji Nagatomi
- Applicant Address: JP Moriguchi-Shi, Osaka
- Assignee: Sanyo Electric Co., Ltd.
- Current Assignee: Sanyo Electric Co., Ltd.
- Current Assignee Address: JP Moriguchi-Shi, Osaka
- Agency: Ditthavong Mori & Steiner, P.C.
- Priority: JP2009-177046 20090729
- Main IPC: G11B5/09
- IPC: G11B5/09 ; G11B7/00 ; G11B7/135 ; G11B5/58 ; G11B5/55

Abstract:
An optical pickup device includes an astigmatism element which imparts astigmatism to laser light reflected on a disc, a spectral element which changes propagating directions of four light fluxes obtained by dividing a light flux of the laser light reflected on the disc to disperse the four light fluxes from each other, and a photodetector having a sensor group which receives the four light fluxes. The optical pickup device is further provided with a memory which holds a correction value for suppressing a DC component in a tracking error signal resulting from a positional displacement of the spectral element. The tracking error signal is corrected by the correction value to thereby suppress the DC component.
Public/Granted literature
- US20110026382A1 OPTICAL PICKUP DEVICE, OPTICAL DISC DEVICE AND FOCUS ADJUSTING METHOD Public/Granted day:2011-02-03
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