Focus error detecting device and optical pickup device...

Details Focus error detecting device and optical pickup device... Focus error detecting device and optical pickup device...

2006-12-19

2006-12-19

Lauchman, Layla (Department: 2877)

Optics: measuring and testing

Lens or reflective image former testing

Focal length measuring

Reexamination Certificate

active

07151595

ABSTRACT:
A focus error detecting device for an optical pickup having an aberration correcting lens group includes a diffraction optical element having an outer diameter which is smaller than a diameter of the light beam after aberration correction, and selectively diffracting light passing through an annular portion with an optical axis as a center in a plane perpendicular to the optical axis of the light beam; and a photodetector which detects the light diffracted by the diffraction optical element. The annular portion includes a portion in which residual ray aberration after aberration correction by the lens group is the smallest.

REFERENCES:
patent: 2002/0003755 (2002-01-01), Fujita et al.
patent: 2003/0035350 (2003-02-01), Ogasawara et al.

Affiliated with

Also associated with

Rating

Focus error detecting device 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 Focus error detecting device and optical pickup device..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focus error detecting device and optical pickup device... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3667614