Invention Grant
- Patent Title: Optical disc device and control circuit for optical disc device
- Patent Title (中): 用于光盘装置的光盘装置和控制电路
-
Application No.: US12064463Application Date: 2006-08-24
-
Publication No.: US07773484B2Publication Date: 2010-08-10
- Inventor: Katsuya Watanabe , Takaharu Ai
- Applicant: Katsuya Watanabe , Takaharu Ai
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Agency: Renner, Otto, Boisselle & Sklar, LLP
- Priority: JP2005-243849 20050825
- International Application: PCT/JP2006/316621 WO 20060824
- International Announcement: WO2007/023905 WO 20070301
- Main IPC: G11B3/74
- IPC: G11B3/74

Abstract:
To prevent the focal point of a light beam from entering an unrecorded area, where no data has been written yet, when data is being read continuously from multiple storage layers.An optical disc drive can read data from an optical disc with at least first and second storage layers. The drive includes: a drive mechanism for rotating the disc; an optical pickup, which irradiates the disc in the drive mechanism with converged light and generates a read signal based on the light reflected from the disc; and a control section for controlling operations of the drive mechanism and the pickup, thereby shifting the focal point of the light. In reading data from the first and second layers continuously, the control section shifts the focal point in a first radial direction while data is read from the first layer and then moves the focal point to a location on the second layer before data starts to be read from the second layer. That location has been shifted from its previous one by a predetermined displacement in a second radial direction that is opposite to the first radial direction.
Public/Granted literature
- US20090092026A1 OPTICAL DISC DEVICE AND CONTROL CIRCUIT FOR OPTICAL DISC DEVICE Public/Granted day:2009-04-09
Information query
IPC分类: