Optical: systems and elements – Lens – Reverse telephoto
Patent
1991-12-03
1993-06-08
Sugarman, Scott J.
Optical: systems and elements
Lens
Reverse telephoto
359708, 359713, 359714, 359749, 359750, 359751, 359752, G02B 1304, G02B 1318
Patent
active
052184803
ABSTRACT:
A wide angle lens system of the retrofocus type is provided which includes two lens units. The first lens unit is of negative power and includes a combination of a positive element having a high dispersion and a negative element having a low dispersion for correction of lateral color. The second lens unit is of positive power and includes a combination of a positive element having a low dispersion and a negative element having a high dispersion for correction of longitudinal color. The lens units satisfy the relationship that the magnitude of f.sub.1 is less than about 1.15 times f.sub.2 and preferably satisfy the relationship that the magnitude of f.sub.1 is less than f.sub.0. The first and second lens units each preferably include an aspheric surface. Applications of the lens system include rear projection television systems wherein a single lens is used to project light from three LCD light valves onto a viewing screen.
REFERENCES:
patent: 3947194 (1976-03-01), Ikemori
patent: 4025169 (1977-05-01), Fischer et al.
patent: 4189211 (1980-02-01), Taylor
patent: 4425028 (1984-01-01), Gagnon et al.
patent: 4461542 (1984-07-01), Gangnon
patent: 4826311 (1989-05-01), Ledebuhr
patent: 4913540 (1990-04-01), Minefuji
Klee Maurice M.
Sugarman Scott J.
U.S. Precision Lens Incorporated
LandOfFree
Retrofocus wide angle 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 Retrofocus wide angle lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Retrofocus wide angle lens will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1946211