Image-space telecentric lens
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United States of America Patent
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Oct 6, 2020
Grant Date -
Oct 5, 2017
app pub date -
Mar 31, 2016
filing date -
Mar 31, 2016
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Abstract
An image-space telecentric lens includes, in order from a magnified side to a minified side, a first lens group of negative refractive power, an aperture stop, and a second lens group of positive refractive power. The first lens group has at least one aspheric surface, and the second lens group has at least one aspheric surface. The second lens group has a cemented lens of positive refractive power, and the cemented lens is nearest the aperture stop as compared with other lens in the second lens group. The image-space telecentric lens satisfies the condition: TT<100 mm, where TT denotes a length measured along an optical axis and between two outermost opposite lens surfaces of the image-space telecentric lens.
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