Projection lens for projection television

Details Projection lens for projection television Projection lens for projection television

1983-05-13

1986-11-04

Corbin, John K.

350412, 350445, 350469, G02B 1318, G02B 934, G02B 2718

Patent

active

046207732

ABSTRACT:
A projection lens for magnifying an image displayed on a cathode-ray tube and projecting the magnified image on a projection screen comprises a first lens having a substantially plano surface opposite to the cathode-ray tube and a concave surface, a second lens which is convex meniscus lens having a concave surface opposite to the concave surface of the first lens, a third lens having a strongest positive refracting power and at one convex surface, and a fourth lens spaced apart by a predetermined distance from the third lens having at least one convex surface. The first to fourth lenses are arranged in the above order from the side of the cathode-ray tube, and the predetermined distance between the third and fourth lenses is large enough to permit interposition of a plano reflecting mirror therebetween.

REFERENCES:
patent: 3429997 (1969-02-01), Rosner et al.
patent: 3516734 (1970-06-01), Schmidt
patent: 3800085 (1974-03-01), Ambats et al.
patent: 3868173 (1975-02-01), Miles et al.
patent: 4232943 (1980-11-01), Rogers
patent: 4300817 (1981-11-01), Betensky
patent: 4348081 (1982-09-01), Betensky

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