Projection lens

Details Projection lens Projection lens

1999-06-08

2000-09-26

Epps, Georgia

Optical: systems and elements

Lens

With field curvature shaping

359680, G02B 300, G02B 1514

Patent

active

061249785

ABSTRACT:
A projection lens is disclosed having a low F-number of 1.7, which uses only a small number of lens elements and wherein various aberrations are favorably corrected. By satisfying certain prescribed conditions, the maximum angle of a principal ray relative to the optical axis on the reducing side of the projection lens is made to be 2.5 degrees or less, and the projection lens is made to be compact so that a back surface of a translucent liquid crystal display can be illuminated nearly telecentrically, i.e., with light that is nearly orthogonal to the surface of the liquid crystal display. The projection lens is constructed of, in order from the enlarging side of the projection lens: a positive first lens element L.sub.1, and a negative second lens element L.sub.2, a negative third lens element L.sub.3 that is cemented to a positive fourth lens element L.sub.4, a positive fifth lens element L.sub.5, and a positive sixth lens element L.sub.6.

REFERENCES:
patent: 2687063 (1954-08-01), Coleman

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2105035