Single focus lens

Optical: systems and elements – Lens – Including a nonspherical surface

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C359S772000, C359S773000, C359S774000, C359S780000

Reexamination Certificate

active

06900948

ABSTRACT:
A single focus lens is disclosed that is formed of only four lens elements. In order from the object side, these are: a first lens element of positive refractive power and having either a concave surface or planar surface on the object side; a second lens element of weak refractive power and meniscus shape that is made of plastic with at least one surface aspheric; a third lens element which has positive refractive power and a convex surface on the image side; and a fourth lens element of weak refractive power and meniscus shape that is made of plastic with at least one surface aspheric and with its concave surface on the image side. Preferably, various conditions are satisfied in order that the single focus lens be compact and favorably correct aberrations so as to provide a high quality image.

REFERENCES:
patent: 5808815 (1998-09-01), Kouthoofd
patent: 5986816 (1999-11-01), Shikama
patent: 6636364 (2003-10-01), Sato

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Single focus lens does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Single focus lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Single focus lens will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3400084

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.