Projection lens

Details Projection lens Projection lens

1992-01-23

1993-08-17

Arnold, Bruce Y.

Optical: systems and elements

Lens

With field curvature shaping

359757, 359713, G02B 300, G02B 302, G02B 962

Patent

active

052374564

ABSTRACT:
A projection lens consists of a first lens group including a positive lens, a second lens group including a meniscus type lens having a comparatively low refractive power, a third lens group including a bonded negative lens, a fourth lens group including a double convex lens, a fifth lens group including a lens having a comparatively low positive refractive power and a sixth lens group including a negative lens having a concave surface at the screen side, whereby, when a lens power of the whole lens system is 1 and a lens power of each lens group is designated by .psi..sub.X (1-6), respective lens powers will be given by the following a-e:

REFERENCES:
patent: 4761063 (1988-08-01), Yoshioka et al.
patent: 4792217 (1988-12-01), Yoshioka
patent: 4989961 (1991-02-01), Yoshioka
patent: 4993816 (1991-02-01), Yoshioka et al.

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