1986-08-22
1987-07-28
Corbin, John K.
350412, 350464, 350465, 350469, G02B 1318, G02B 934, G02B 960, G02B 962
Patent
active
046828621
ABSTRACT:
A projection lens system adapted to project an image from a cathode ray tube and consisting from the image end of a first lens unit of weak optical power, a second lens unit of strong optical power including a biconvex glass element, a third lens unit of strongly negative optical power having a convex image side surface and serving as a field flattener, the first lens unit consisting of a first meniscus shaped element having positive power at the optical axis having at least one aspheric surface and being convex to the image, and a second meniscus shaped element having at least one aspheric surface, the said second meniscus being convex to the second lens group and closely spaced thereto. The second meniscus may be on either side of the second lens unit and is of very weak optical power.
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), Goranstein
patent: 4479695 (1984-10-01), Neil
patent: 4530575 (1985-07-01), Yamakawa et al.
patent: 4548480 (1985-10-01), Yamamoto et al.
patent: 4561736 (1985-12-01), Furter et al.
patent: 4564269 (1986-01-01), Uejara
patent: 4577935 (1986-03-01), Yamakawa et al.
patent: 4595263 (1986-06-01), Clarke
patent: 4603950 (1986-08-01), Uehara et al.
Printed Publication-Diagram of a Lens entitled, Advent Lens Mod II.
Printed Publication-pp. 470-482 of a Volume entitled, A System of Optical Design, by Cox.
Corbin John K.
Sugarman Scott J.
U.S. Precision Lens Incorporated
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