Objective lens for optical pick-up

Details Objective lens for optical pick-up Objective lens for optical pick-up

2006-09-12

2006-09-12

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C369S112060

Reexamination Certificate

active

07106525

ABSTRACT:
There is provided an objective lens for an optical pick-up used for different types of optical discs. The objective lens has at least one surface on which a plurality of annular zones are formed. The at least one surface is divided into an inner area having a low NA and an outer area having high NA outside the inner area. Further, with regard to a light beam used for a second optical disc (e.g., a DVD), an optical path difference generated between at least one of steps formed between adjacent annular zones of the plurality of annular zones within the outer area is lower by a predetermined amount than an integral multiple of a wavelength of the light beam used for the second optical disc.

REFERENCES:
patent: 6088322 (2000-07-01), Broome et al.
patent: 6191889 (2001-02-01), Maruyama
patent: 6473387 (2002-10-01), Maruyama et al.
patent: 6624942 (2003-09-01), Maruyama
patent: 2002/0172132 (2002-11-01), Takeuchi et al.
patent: 2003/0058776 (2003-03-01), Sakamoto
patent: 1102251 (2001-05-01), None
patent: 200 1-338431 (2001-12-01), None
patent: 200 2-372665 (2002-12-01), None

Affiliated with

Also associated with

Rating

Objective lens for optical pick-up does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3591279