Invention Grant
US08194521B2 Optical disc device, video reproducing apparatus, server, car navigation system using the optical disc device, integrated circuit and recording/reproducing method
有权
光盘装置,视频再现装置,服务器,使用光盘装置的车载导航系统,集成电路和记录/再现方法
- Patent Title: Optical disc device, video reproducing apparatus, server, car navigation system using the optical disc device, integrated circuit and recording/reproducing method
- Patent Title (中): 光盘装置,视频再现装置,服务器,使用光盘装置的车载导航系统,集成电路和记录/再现方法
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Application No.: US12740721Application Date: 2009-08-26
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Publication No.: US08194521B2Publication Date: 2012-06-05
- Inventor: Hidenori Wada , Yoshiaki Komma , Takeshi Shimamoto
- Applicant: Hidenori Wada , Yoshiaki Komma , Takeshi Shimamoto
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Agency: Wendertoth, Lind & Ponack, L.L.P.
- Priority: JP2008-223124 20080901
- International Application: PCT/JP2009/004133 WO 20090826
- International Announcement: WO2010/023901 WO 20100304
- Main IPC: G11B7/00
- IPC: G11B7/00

Abstract:
An optical disc device is provided with an optical head including a light source, a condensing optical system including an objective lens for receiving a light beam emitted from the light source and forming a microspot on a multilayer optical recording medium, a photodetector for receiving the light beam reflected by the multilayer optical recording medium and outputting an electrical signal corresponding to the amount of light and a coma aberration correcting element for correcting a coma aberration of the condensing optical system, and a processing circuit for controlling the condensing optical system and the coma aberration correcting element. The processing circuit controls the condensing optical system and the coma aberration correcting element so that the correction of the coma aberration from a value suitable for a first recording layer to a value specified for a second recording layer is started before a movement of a focus position of the microspot from the first recording layer to the second recording layer is completed.
Public/Granted literature
Information query
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