Patent ID: 6844984

Claim:
A variable focal length projection objective, preferably serving to image tilting mirror matrices or reflecting and/or transmitting LCDs, said projection objective comprising a first group of lenses, a second group of lenses and a third group of lenses arranged on a common optical axis, wherein, starting from a side facing a projection screen, the first group of lenses, serving the purpose of focussing, and the second group of lenses, serving the purpose of varying the focal length, are variably positionable on the optical axis, and the third group of lenses is stationary on the optical axis, wherein: 1.0 h max<dG2-G3<1.5 h max and s≦10 mm, wherein h max is a maximum object height, dG2-G3 is distance between the second group of lenses and the third group of lenses in a first position, and s is the distance from a back vertex of the third group of lenses to an object.