Tilt servo system for correcting tilt angle of light beam in...

Details Tilt servo system for correcting tilt angle of light beam in... Tilt servo system for correcting tilt angle of light beam in...

2007-07-24

2007-07-24

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053190, C369S112020

Reexamination Certificate

active

10624892

ABSTRACT:
A highly accurate and stable tilt servo system is provided. A liquid crystal device for phase correction is driven based on drive data stored in a lookup memory to thereby make a tilt correction. Upon pre-processing, a pickup is moved to a predetermined position on the inner circumference of a disc for a tilt correction to employ tilt error data delivered from a tilt sensor as reference tilt error data and drive data served for the tilt correction as a reference tilt correction quantity. After the pre-processing, when the pickup is moved, the difference between the tilt error data delivered from the tilt sensor at each position of movement and the reference tilt error data is employed as a relative correction quantity. The drive data equivalent to the relative correction quantity is acquired from the lookup memory. The drive data acquired is added to the reference correction quantity to thereby determine a tilt correction quantity. The liquid crystal device is driven based on drive signals equivalent to the tilt correction quantity.

REFERENCES:
patent: 4850695 (1989-07-01), Mikuriya et al.
patent: 5627808 (1997-05-01), Hajjar et al.
patent: 5886496 (1999-03-01), Furukawa et al.
patent: 6115334 (2000-09-01), Tsutsui et al.
patent: 6137754 (2000-10-01), Furukawa et al.
patent: 6160772 (2000-12-01), Muramatsu
patent: 6370095 (2002-04-01), Ogasawara
patent: 6661415 (2003-12-01), Yasuda et al.
patent: 6754145 (2004-06-01), Shimamoto et al.
patent: 1 213 711 (2002-06-01), None
patent: 10-177729 (1998-06-01), None
European Search Report dated Nov. 6, 2003.

Affiliated with

Also associated with

Rating

Tilt servo system for correcting tilt angle of light beam in... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Tilt servo system for correcting tilt angle of light beam in..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tilt servo system for correcting tilt angle of light beam in... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3720614