Optical pick up and optical disc apparatus

Details Optical pick up and optical disc apparatus Optical pick up and optical disc apparatus

2011-08-09

2011-08-09

Edun, Muhammad N (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S044320, C369S044250, C369S044410

Reexamination Certificate

active

07995437

ABSTRACT:
An optical pickup includes: a light source emitting a beam having a predetermined wavelength; a plastic objective lens condensing the emitted beam on an optical disc; a light detector receiving and detecting the beam reflected by the optical disc; an objective-lens driving unit driving the objective lens in the tilt direction to tilt the objective lens; and a tilt-sensitivity sensing unit sensing a tilt sensitivity denoted by ΔWLT/Δθ, where ΔWLT[λrms] is a coma aberration amount Δθ [deg] is a tilt amount at the time of tilting the objective lens, wherein, in the case where the sensed tilt sensitivity is equal to or larger than a predetermined value, tilt is corrected by tilting the objective lens so that signal quality detected by the light detector is improved, and in the case where the sensed tilt sensitivity is smaller than the predetermined value, tilt is not corrected.

REFERENCES:
patent: 7843774 (2010-11-01), Nagura
patent: 2004/0057353 (2004-03-01), Ohno et al.
patent: 2005-209283 (2005-08-01), None
patent: 2005-293746 (2005-10-01), None
patent: 2007-294023 (2007-11-01), None
patent: 2007-328886 (2007-12-01), None
patent: 2008-112575 (2008-05-01), None
patent: 2008-234803 (2008-10-01), None
patent: 2009-211775 (2009-09-01), None
patent: 2010-123213 (2010-06-01), None
patent: 2010-153015 (2010-07-01), None
patent: WO 2007/138924 (2007-12-01), None

Affiliated with

Also associated with

Rating

Optical pick up and optical disc apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical pick up and optical disc apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical pick up and optical disc apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2666853