ARTICLE HAVING A BIREFRINGENT SURFACE AND MICROSTRUCTURED FEATURES HAVING A VARIABLE PITCH OR ANGLES AND PROCESS FOR MAKING THE ARTICLE

摘要

Microstructured features having a variable pitch or angles on a birefringence surface of an article and a process for making it. The article is uniaxial oriented to provide the birefringence. The variable pitch provides for various optical effects and can include a random pitch, periodic pitch, quasi-periodic pitch, or a combination of them.