Fixed-focus lens

Details Fixed-focus lens Fixed-focus lens

2008-01-04

2008-09-09

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S651000, C359S716000, C359S740000, C359S788000

Reexamination Certificate

active

07423819

ABSTRACT:
A fixed-focus lens including a first lens group, a second lens group, and a third lens group is provided. The first lens group has a negative refractive power, includes a plurality of lenses, and is disposed between an object side and an image side. The lenses of the first lens group include at least one aspheric lens. The second lens group is disposed between the first lens group and the image side and has a positive refractive power. The third lens group is disposed between the second lens group and the image side and has a positive refractive power. The third lens group includes a first triple cemented lens and a second triple cemented lens arranged from the object side to the image side in sequence.

REFERENCES:
patent: 4062622 (1977-12-01), Sugiyama
patent: 6542316 (2003-04-01), Yoneyama
patent: 6912095 (2005-06-01), Yamada
patent: 6989946 (2006-01-01), Kobayashi et al.
patent: 7006300 (2006-02-01), Shinohara
patent: 2002/0005994 (2002-01-01), Shikama

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3990057