Projection-lens system

Details Projection-lens system Projection-lens system

1985-05-13

1989-10-10

Arnold, Bruce Y.

350412, 350474, 350477, G02B 1318

Patent

active

048727482

ABSTRACT:
An achromatic temperature-independent projection lens system for projecting a magnified image of a scene reproduced by means of a reproduction-tube, onto a projection screen. The 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 convex-concave lens and a biconvex lens and has two spheric outer surfaces. The correction groups each comprise one lens whose surface which faces the image is aspheric.

REFERENCES:
patent: 4348081 (1982-09-01), Betensky

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