Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2007-06-26
2007-06-26
Young, Wayne (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S112020, C369S112280
Reexamination Certificate
active
10975605
ABSTRACT:
Apparatus and method for exposing an optical disk master having a laser source, a deflector for deflecting a recording laser beam based on the laser beam of the laser source and an objective lens for focusing the recording laser beam on an optical disk master, including a liquid crystal plate provided between the laser source and the deflector, a parallel flat plate provided between the deflector and the objective lens, a photodetector that detects reflected light from the parallel flat plate, and an adjusting device for adjusting a voltage applied to the liquid crystal plate based on information on wavefront fluctuation of the recording laser beam detected by the photodetector.
REFERENCES:
patent: 4209793 (1980-06-01), Ueno
patent: 4768182 (1988-08-01), Hatfield
patent: 4838989 (1989-06-01), Ashby et al.
patent: 5570224 (1996-10-01), Endo et al.
patent: 6087669 (2000-07-01), Suzuki
patent: 6172957 (2001-01-01), Ogasawara
patent: 6256281 (2001-07-01), Tanaka et al.
patent: 6628582 (2003-09-01), Furukawa
patent: 05-81708 (1993-04-01), None
patent: 05-314543 (1993-11-01), None
patent: 08-203135 (1996-08-01), None
patent: 09-035308 (1997-02-01), None
patent: 09-231610 (1997-09-01), None
patent: 10-269611 (1998-10-01), None
patent: 11-162022 (1999-06-01), None
patent: 2000-021002 (2000-01-01), None
patent: 2000021002 (2000-01-01), None
Chinese Office Action for Patent Application No. 021412472, dated Nov. 5, 2004 (with English translation).
Abe Shinya
Ito Eiichi
Sato Shuji
Tomiyama Morio
Tsukuda Masahiko
Danielsen Nathan
Matsushita Electric - Industrial Co., Ltd.
RatnerPrestia
Young Wayne
LandOfFree
Exposure apparatus of an optical disk master, method of... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Exposure apparatus of an optical disk master, method of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exposure apparatus of an optical disk master, method of... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3834943