Projection objective

Details Projection objective Projection objective

2005-01-18

2005-01-18

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S689000, C359S748000, C359S784000, C359S792000

Reexamination Certificate

active

06844984

ABSTRACT:
A projection objective having a variable focal length, preferably serving to image tilting mirror matrices or reflecting and/or transmitting LCDs, said projection objective comprising three groups of lenses (G1, G1, G3) arranged on a common optical axis, wherein, starting from the side facing the projection screen, the first lens group (G1), serving the purpose of focussing, and the second lens group (G2), serving the purpose of varying the focal length, are arranged on the optical axis in a variably positioned manner, and the third lens group (G3) is stationary.According to the invention, the following condition is met:in-line-formulae description="In-line Formulae" end="lead"?1.0 h max<dG2-G3<1.5 h maxin-line-formulae description="In-line Formulae" end="tail"?andin-line-formulae description="In-line Formulae" end="lead"?s≦10 mm,in-line-formulae description="In-line Formulae" end="tail"?wherein h max is the maximum object height, dG2-G3 is the distance between the lens group G2 and the lens group G3 in a first position, and s is the object-side intercept distance or distance from the vertex to the object.

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