Device for short-distance projection at a reasonably large angle with zoom and focusing
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United States of America Patent
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Apr 28, 2015
Grant Date -
Dec 27, 2012
app pub date -
Jan 11, 2011
filing date -
Jan 22, 2010
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Abstract
The invention proposes a short-distance front projection system, that is to say with a wide angle, occupying a small volume and offering a possibility of focusing as well a zoom function. It makes it possible to obtain images with a diagonal greater than 2 meters, the whole of the optical system being at least 50 cm from the plane of the image. This projector is constructed on the basis of three optical elements: an ocular, an afocal lens system and a final group forming an objective intended to form the intermediate image in front of the mirror.
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