Optische Werke G. Rodenstock

Ernst Rothe

Jakob Bleicher

Wolfgang Riedel

Manfred Knote

Scanning system

An objective of great overall length having two lens groups with a positive lens power and an aperture disposed in front of or within of the first lens group. The first lens group includes a positive lens and a negative lens. The second lens group has at least four lens components with lens powers of positive, negative, positive and negative, respectively the distance between the two lens groups being greater than the focal length of the objective. Additionally, the lens components of the second lens group satisfy the following conditions:

Objective of great overall length

A scanning objective with two optical elements, which includes at least one aspherical surface; the aspherical surface is so constructed that in comparison with a spherical surface with the same vertex radius of curvature, the thickness of the lens increases toward the outside. By this construction of the aspherical surface in accordance with the present invention, for example, a scanning objective with two lenses and an aspherical surface can be obtained which is limited in diffraction for small image scales.

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Munich, Germany

Ernst Rothe