Projection lens system

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G02B 13/16 (2006.01) G01B 13/18 (2006.01) G02B 13/18 (2006.01) H04N 9/31 (2006.01)

Patent

CA 1308583

PHN 11.957 19 11.1.1987 ABSTRACT: Projection lens system. A projection lens system is described for projecting a magnified image from an image source (3, 4, 5) on a projection screen (lo), which lens system comprises from the image end successively a first, positive lens group (L1) and at least a second, negative lens group (L3) whose surface (S6) facing the image end is concave. The first lens group consists of a single lens element (L1) which in addition to a first refractive surface (S1) facing the image end and a second refractive surface (S2) facing the object end has a third radiation-reflecting surface (S3) which is located between the first and the second surface. Figure 2.

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