Projecting lens

Details Projecting lens Projecting lens

1990-08-16

1991-11-19

Arnold, Bruce Y.

Optical: systems and elements

Lens

With field curvature shaping

359676, 359708, 359754, G02B 300

Patent

active

050661132

ABSTRACT:
A projecting lens comprising, when viewed from a screen, a first lens group having positive refracting power and an aspherical lens thereof; a second lens group having positive refracting power, a third lens group having positive refracting power and an aspherical lens, and a fourth lens group having negative refracting power, wherein the following conditions are met assuming that the focal distance of the first lens group is f.sub.G1, the focal distance of the third lens group is f.sub.G3 and the focal distance of the overall system is f: 0=f/f.sub.G1 <0.25, 0=f/f.sub.G3 <0.3.

REFERENCES:
patent: 3609006 (1971-09-01), Pospisil
patent: 4548480 (1985-10-01), Yamamoto et al.
patent: 4603950 (1986-08-01), Uehara et al.
patent: 4770513 (1988-09-01), Fujie et al.

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