Projection lens

Details Projection lens Projection lens

1997-09-29

1998-08-25

Sugarman, Scott J.

Optical: systems and elements

Lens

With field curvature shaping

G02B 900

Patent

active

057988684

ABSTRACT:
An improved projection lens capable of advantageously decreasing a distortional aberration by providing a longer back focal length, which includes which includes a first lens group including a concave lens and a plurality of convex lenses, which are formed in order from a screen; a light amount control member formed on an optical axis and behind the first lens group for controlling the amount of light transmitted from the first lens group; a second lens group formed on the optical axis behind the light amount control member; a third lens group formed on the optical axis and behind the light amount control member and including a plurality of lenses; and a block formed on the optical axis and behind the third lens group for adjusting a focal distance.

REFERENCES:
patent: 5066113 (1991-11-01), Nakajima et al.
patent: 5130850 (1992-07-01), Toida

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