METHOD OF FORMING FILM OF LENS AND FRESNEL LENS
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United States of America Patent
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Jun 6, 2019
app pub date -
Nov 14, 2018
filing date -
Dec 6, 2017
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Abstract
A Fresnel lens includes a Fresnel lens body, grooves formed on the lens surface of the Fresnel lens body and having bottom surfaces and inclined surfaces and a light absorber formed over the inclined surfaces and the bottom surfaces in which a contact angle at an end portion of the light absorber with respect to the bottom surface is larger than 70 degrees is used. A method of forming a film of a lens includes coating inclined portions of a plurality of grooves formed on a lens surface with ink, fixing the ink and removing unnecessary portions of the ink by laser.
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