Afocal attachment for projection lens

Optics: image projectors – Lens support – Lens position adjustable

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C353S098000, C353S121000, C359S651000, C359S649000, C359S733000, C359S689000, C359S744000, C359S735000, C348S771000

Reexamination Certificate

active

07988306

ABSTRACT:
A projection apparatus has a spatial light modulator to modulate illumination from a laser light source. A base projection lens has, from its long conjugate side to its short conjugate side, a first lens group with negative focal length and with a first lens element that has a negative focal length and a second lens element of positive focal length, a second lens group of negative focal length and spaced apart from the first lens group and having one or more cemented lens elements, and a third lens group spaced apart from the second lens group and having a lens with a positive focal length. The base projection lens has a first field of view and is telecentric in its short conjugate. An afocal attachment to the base projection lens alters the first field of view by the same amount in both of two orthogonal directions.

REFERENCES:
patent: 2956475 (1960-10-01), Harris et al.
patent: 3302516 (1967-02-01), Stapsy
patent: 3409346 (1968-11-01), Stapsy
patent: 4621890 (1986-11-01), Suzuki et al.
patent: 5870228 (1999-02-01), Kreitzer et al.
patent: 6417971 (2002-07-01), Moskovich
patent: RE39424 (2006-12-01), Moskovich
patent: 7184219 (2007-02-01), Kobayashi
patent: 2002/0140913 (2002-10-01), Yoneyama et al.

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

Afocal attachment for projection 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 Afocal attachment for projection lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Afocal attachment for projection lens will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2732267

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