Invention Grant
US07830773B2 Optical pickup for recording and reproducing information with a plurality of types of optical information recording mediums
失效
用于利用多种类型的光学信息记录介质记录和再现信息的光学拾取器
- Patent Title: Optical pickup for recording and reproducing information with a plurality of types of optical information recording mediums
- Patent Title (中): 用于利用多种类型的光学信息记录介质记录和再现信息的光学拾取器
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Application No.: US11667844Application Date: 2005-09-16
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Publication No.: US07830773B2Publication Date: 2010-11-09
- Inventor: Masahiko Nishimoto , Yasuyuki Kochi , Shinichi Ijima , Takuya Okuda , Masayuki Ono
- Applicant: Masahiko Nishimoto , Yasuyuki Kochi , Shinichi Ijima , Takuya Okuda , Masayuki Ono
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Agency: McDermott Will & Emery LLP
- Priority: JP2004-331789 20041116
- International Application: PCT/JP2005/017119 WO 20050916
- International Announcement: WO2006/054383 WO 20060526
- Main IPC: G11B7/135
- IPC: G11B7/135
Abstract:
An optical pickup device in which a hologram element has a plurality of different diffraction directions. In the tracking standard state, the hologram element is divided into six areas by a straight line connecting two strength center points of two light beams, and by two straight lines that are perpendicular to the straight line. By adding the amount of light received by an area demarcated by two straight lines that pass the two strength center points, to the amount of light received by one of two outer areas sandwiching the area depending on the type of the light beam, it is possible to obtain a well-balanced tracking error signal for each of the two light beams.
Public/Granted literature
- US20090034394A1 Optical Pickup Public/Granted day:2009-02-05
Information query
IPC分类:
