Projection lens

Details Projection lens Projection lens

1986-04-21

1988-08-30

Arnold, Bruce Y.

350432, 350463, G02B 302, G02B 964, G02B 1318

Patent

active

047671998

ABSTRACT:
A projection lens for projecting an image appearing on a cathode-ray tube onto a screen, small in residual aberrations, having a high imaging performance, also having a large aperture ratio and a wide field angle, suitable for a video projector having a high definition of, say, 1,125 scanning lines. The projection lens has, successively from the screen side, a Gauss type lens system, a positive lens mainly for enlarging the aperture ratio, and a negative lens mainly for widening the field angle, which negative lens has a strongly concave surface at the screen end.

REFERENCES:
patent: 4300817 (1981-11-01), Betensky
patent: 4348081 (1981-09-01), Betensky

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