VARIABLE IMAGING SYSTEM WITH AN OBJECTIVE OF FIXED FOCAL LENGTH
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United States of America Patent
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Issued Date -
Jun 19, 2014
app pub date -
Dec 13, 2013
filing date -
Dec 19, 2012
priority date (Note) -
Abandoned
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Abstract
A variable imaging system which, starting from the object end, includes an objective of fixed focal length, at least one afocal zoom system, and a tube lens system. An afocal system of fixed magnification is arranged on the beam path between the objective and the afocal zoom system. The system includes means for axial displacement of the afocal system relative to the objective and to the zoom system, such that the position of the common back focal point of objective and afocal system is always set to the position of the entrance pupil of the zoom system, thus ensuring that object imaging is telecentric. The imaging system is suitable for use in microscopes. The invention can also be used to advantage in other optical systems employing tube lens systems of fixed or variable focal length.
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