Focal point adjusting method, and optical pickup device

Details Focal point adjusting method, and optical pickup device Focal point adjusting method, and optical pickup device

2007-08-21

2007-08-21

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044320, C369S044230, C369S053350

Reexamination Certificate

active

10485404

ABSTRACT:
A focus control process (S2), a spherical aberration correcting process (S4), and a focus offset adjusting process (S7to S9) are performed in this order. In the focus control process, an output of a focus error signal obtained by detecting focal point displacement that occurs in a direction of an optical axis of a light beam focused through a two-element object lens is controlled so that the output becomes close to zero. In the spherical aberration correcting process, spherical aberration that occurs with respect to the light beam is corrected. In the focus offset adjusting process, offset of the focus error signal is adjusted. In this way, it is possible to provide a focal point adjusting method and an optical pickup device in which focus control can be performed stably by eliminating the offset.

REFERENCES:
patent: 6011762 (2000-01-01), Watanabe et al.
patent: 6078554 (2000-06-01), Ootaki et al.
patent: 6169714 (2001-01-01), Tanaka et al.
patent: 6215756 (2001-04-01), Shimano et al.
patent: 6324133 (2001-11-01), Ichimura
patent: 6498330 (2002-12-01), Yoshida
patent: 6885616 (2005-04-01), Kikuchi et al.
patent: 1215207 (1999-04-01), None
patent: 1244006 (2000-02-01), None
patent: 11353681 (1999-12-01), None
patent: 2000-11388 (2000-01-01), None
patent: 2000-40237 (2000-02-01), None
patent: 2000-339726 (2000-12-01), None
patent: 2001-507463 (2001-06-01), None
patent: WO99/18466 (1999-04-01), None

Affiliated with

Also associated with

Rating

Focal point adjusting method, and optical pickup device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Focal point adjusting method, and optical pickup device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focal point adjusting method, and optical pickup device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3850530