Optical lens
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United States of America Patent
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May 9, 2017
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N/A
app pub date -
Nov 14, 2014
filing date -
Jul 27, 2012
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Abstract
An optical lens includes a first lens group and a second lens group. The first lens group is disposed between a magnified side and a minified side and has a negative refractive power. The second lens group is disposed between the first lens group and the minified side and has a positive refractive power. The optical lens is capable of forming an image at the magnified side. F/H>0.52, where F is an effective focal length, and H is an image height. A viewing angle is greater than 116.7 degrees.
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