Invention Grant
- Patent Title: Optical pickup driving apparatus and optical pickup beam spot positioning method
- Patent Title (中): 光拾取驱动装置和光拾取光束定位方法
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Application No.: US10550539Application Date: 2004-09-29
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Publication No.: US07800987B2Publication Date: 2010-09-21
- Inventor: Yoshiaki Komma , Akira Yoshikawa
- Applicant: Yoshiaki Komma , Akira Yoshikawa
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Agency: RatnerPrestia
- Priority: JP2003-345398 20031003
- International Application: PCT/JP2004/014673 WO 20040929
- International Announcement: WO2005/034112 WO 20050414
- Main IPC: G11B7/00
- IPC: G11B7/00

Abstract:
In an optical pickup driving apparatus and method, a moving device is controlled when an objective lens is moved toward a recording surface and it is detected that the voltage of the focus error signal has reached a slice level voltage H corresponding to displacement of predetermined magnitude from a reference potential E. The objective lens is moved toward the recording surface by a maximum of an upper limit of a predetermined amount of movement and when the amount of movement of the objective lens reaches the predetermined amount of movement, so as to move the objective lens away from the recording surface. And when it is detected during a period of backward movement of the objective lens, that the voltage of the focus error signal has reached the second slice level voltage H corresponding to displacement of predetermined magnitude from the reference potential E, control of beam spot positioning is performed so as to focus an optical spot.
Public/Granted literature
- US20060203628A1 Optical pickup driving device and optical pickup focus pull-in method Public/Granted day:2006-09-14
Information query
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