Patent ID: 7875218
Filing Date: 2011-01-25
Classification: F21V,G02B,G02F

Abstract:
1. A method of making an optical film, plate or substrate out of at least two transparent substrates having different indices of refraction comprising the steps of preforming a pattern of optical deformities on or in one side of one of the substrates, melting or heat softening one side of an other substrate and pressing the melted or softened side of the other substrate in direct contact against the preformed pattern of optical deformities on or in the one side of the one substrate to form the inverse pattern of optical deformities in or on the melted or softened side of the other substrate, and then cooling the substrates to cause the one side of the other substrate to harden and bond in direct contact to the one side of the one substrate with the optical deformities and inverse optical deformities in direct mating engagement with one another.