Projection lens and image display device

Details Projection lens and image display device Projection lens and image display device

1999-06-28

2000-10-10

Sugarman, Scott J.

Optical: systems and elements

Lens

With field curvature shaping

359714, G02B 300, G02B 1318

Patent

active

061307866

ABSTRACT:
An image display device which is compact on the whole and low in cost, and which uses a plurality of projection lens systems each of which is constituted by five lens groups including a first aspherical lens group, a second aspherical lens group, a third biconvex lens group, a fourth aspherical lens group and a fifth aspherical lens group which are arranged in this order successively from a screen side, the third lens group having refractive power of not lower than 70% of the total power of the projection lens system, the respective peripheral shapes of the first and second aspherical lens groups being set to have a predetermined relation, a low-dispersion high-index glass material being used for a convex lens of a green projection lens system, a high-dispersion high-index glass material being used for convex lenses of blue and red projection lens systems.

REFERENCES:
patent: 4682862 (1987-07-01), Moskovich
patent: 4792217 (1988-12-01), Yoshioka
patent: 4884879 (1989-12-01), Fukuda et al.
patent: 5055922 (1991-10-01), Wessling
patent: 5200814 (1993-04-01), Hirata et al.
patent: 5321551 (1994-06-01), Choi
patent: 5659424 (1997-08-01), Osawa et al.

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