1986-01-17
1987-08-11
Corbin, John K.
350412, 350418, 350469, 350477, G02B 1318, G02B 106, G02B 912, G02B 934
Patent
active
046857745
ABSTRACT:
A compact projection lens for a cathode ray tube having a field angle as great as 73.degree. which may utilize only three lens elements where the first lens element from the image side has two aspheric surfaces in the shape of an overall meniscus which goes from positive optical power at the optical axis to relatively strong negative optical power at the limit of the clear aperture of the lens. The spacing between the first and second lens elements is chosen to aid in contributing to correction of field curvature.
REFERENCES:
patent: 2417330 (1947-03-01), Strang
patent: 2440088 (1948-04-01), Grey
patent: 2468564 (1949-04-01), Luneburg
patent: 2479907 (1949-08-01), Cox
patent: 2502543 (1950-04-01), Warmisham
patent: 2552672 (1951-05-01), Grey
patent: 2638034 (1953-05-01), Wreathall
patent: 2660094 (1953-11-01), Wreathall
patent: 2737849 (1956-03-01), Tiller
patent: 2865253 (1958-12-01), Thielens
patent: 3429997 (1969-02-01), Rosner et al.
patent: 3567304 (1971-03-01), Kruger
patent: 3778133 (1973-12-01), Tatian
patent: 3800085 (1974-03-01), Ambats et al.
patent: 3817604 (1974-06-01), Watt
patent: 3868173 (1975-02-01), Miles et al.
patent: 3951523 (1976-04-01), Nishimoto
patent: 3980399 (1976-09-01), Howden
patent: 3998527 (1976-12-01), Ikeda et al.
patent: 4099848 (1978-07-01), Osakabe
patent: 4181409 (1980-01-01), Whitney et al.
patent: 4240701 (1980-12-01), Lytle
patent: 4300817 (1981-11-01), Betensky
patent: 4348081 (1982-09-01), Betensky
patent: 4397520 (1983-08-01), Neil
patent: 4474437 (1984-10-01), Gorenstein
patent: 4479695 (1984-10-01), Neil
patent: 4526442 (1985-07-01), Betensky
patent: 4561736 (1985-12-01), Furter et al.
patent: 4564269 (1986-01-01), Uehara
patent: 4577935 (1986-03-01), Yamakawa et al.
patent: 4603950 (1986-08-01), Uehara et al.
Cox; A System of Optical Design, Focal Press (1965); pp. 470-482.
"Minimax Approximation by a Semi-Circle" by Charles B. Dunham and Charles R. Crawford, published in the Society for Industrial and Applied Mathematics Journal, vol. 17, No. 1, Feb. 1980.
Corbin John K.
Sugarman Scott J.
U.S. Precision Lens Incorporated
LandOfFree
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.
Profile ID: LFUS-PAI-O-399680