Imaging system having a liquid crystal element for selectively deflecting a beam path to vary the focal length thereof
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United States of America Patent
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Apr 1, 2014
Grant Date -
Dec 6, 2012
app pub date -
Feb 16, 2011
filing date -
Feb 17, 2010
priority date (Note) -
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Abstract
An imaging system for imaging an object onto an image sensor, and which has a front side facing the object and a rear side facing away from the object, the rear side being arranged behind the front side as viewed from the object. Furthermore, the imaging system has a light entrance device at the front side through which light coming from the object can enter into the imaging system. In this case, the light traverses the beam path between object and image sensor. At least one first and one second optical element are likewise present and are arranged at the rear side in such a way that they can influence the beam path. The light entrance device has an electrically switchable liquid crystal element which deflects the beam path at at least one first angle and a second angle which is different from the first angle depending on the electrical switching state. A discretely switchable focal length change is realized by this electrically effected change in the beam path.
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