Optical: systems and elements – Compound lens system
Patent
1995-09-05
1997-07-15
Dzierzynski, Paul M.
Optical: systems and elements
Compound lens system
359365, 359377, 359422, 359432, 359508, 359514, 359556, 359557, 355 68, G02B 520, G02B 1700, G02B 2300, G03B 2774
Patent
active
056488670
ABSTRACT:
An objective has a first group of lenses with a first optical axis and a second group of lenses with a second optical axis. The optical axes are offset from and parallel to one another. A pair of Porroprisms is disposed between the first lens group and the second lens group and serves to rotate images. The Porroprisms cause a shift in optical axis, and the first and second optical axes are spaced from each other by a distance corresponding to this shift. The arrangement is such that light travelling along the optical axis of one lens group can enter the Porroprisms for reflection to the optical axis of the other lens group. The first lens group has negative refractive power while the second lens group has positive refractive power. A rhomboidal prism is located on the side of the second lens group remote from the Porroprisms and functions to cause a shift in optical axis equal but opposite to the shift caused by the Porroprisms.
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Dietzsch Eberhard
Hellriegel Walter
Agfa-Gevaert AG
Dzierzynski Paul M.
Sikd-er Mohammad Y.
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