Refraction-type projection lens

Details Refraction-type projection lens Refraction-type projection lens

1986-10-07

1988-10-18

Corbin, John K.

350412, 350465, G02B 1318, G02B 302, G02B 960

Patent

active

047782641

ABSTRACT:
A projection lens for projecting an image appearing on a CRT onto a large-sized screen, comprising, from the screen side a first lens structure including a meniscus lens having both surfaces convex toward the screen, a second lens structure comprising a cemented glass lens, a single glass lens and a plastic aspherical lens, and third lens structure of negative power with one concave surface toward the screen. Locating the aspherical surface on the plastic lens, and providing most of the lens power with the glass lenses, achieves low cost of manufacture, light weight, little chromatic aberration, and little change of focal length with change of temperature.

REFERENCES:
patent: 3429997 (1969-02-01), Rosner et al.
patent: 3800085 (1974-03-01), Ambats et al.
patent: 3868173 (1975-02-01), Miles et al.
patent: 4564269 (1986-01-01), Vehara
patent: 4577935 (1986-03-01), Yamakawa et al.
patent: 4620773 (1986-11-01), Fukuda
patent: 4666261 (1987-05-01), Arai
patent: 4682862 (1987-07-01), Moskovich
patent: 4685774 (1987-08-01), Moskovich
patent: 4697892 (1987-10-01), Betensky

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