Projection lens system

Details Projection lens system Projection lens system

1987-02-02

1991-06-25

Arnold, Bruce Y.

350412, G02B 1318

Patent

active

050261495

ABSTRACT:
A projection lens system for projecting a magnified image from an image source (3, 4, 5) on a projection screen (10) comprises from the image end successively a first, positive lens group (L.sub.1) and at least a second, negative lens group (L.sub.3) whose surface (S.sub.6) facing the image end is concave. The first lens group consists of a single lens element (L.sub.1) which in addition to a first refractive surface (S.sub.1) facing the image end and a second refractive surface (S.sub.2) facing the object end has a third radiation-reflecting surface (S.sub.3) which is located between the first and the second surface.

REFERENCES:
patent: 4526442 (1985-07-01), Betensky et al.
patent: 4592627 (1986-06-01), Smid

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