Projection-lens system

Details Projection-lens system Projection-lens system

G - Physics

02

B

88/106, 88/52

G02B 13/16 (2006.01) G02B 13/18 (2006.01)

Patent

CA 1270686

PHN 11 279 12 15-5-1985 ABSTRACT: Projection lens system. An achromatic temperature-independent projection lens system is described for projecting a magnified image of a scene reproduced by means of a reproduction-tube onto a projection screen, which lens system comprises two correction groups and one main group which provides substantially the entire power of the lens system. The main group comprises a cemented doublet of a convexo concave lens and a biconvex lens and has two spheric outer surfaces. The correction groups each comprise one lens whose surfact facing the image side is aspheric.

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