Projection lens

Details Projection lens Projection lens

1984-08-23

1986-01-14

Corbin, John K.

350412, 350469, G02B 934, G02B 1318

Patent

active

045642699

ABSTRACT:
A projector lens comprises, in succession from the screen side, a first lens of positive refractive power, a second lens of positive refractive power having a biconvex shape, a third lens of negative refractive power in a shape of a meniscus with its highly concave surface facing to the screen side and a fourth lens of negative refractive power having a highly concave surface facing to the screen side.

REFERENCES:
patent: 3516734 (1970-06-01), Schmidt
patent: 3800085 (1974-03-01), Ambats et al.
patent: 3868173 (1975-02-01), Miles et al.
patent: 4348081 (1982-09-01), Betensky

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