METHOD AND APPARATUS FOR INSPECTING DEFECT IN LIGHT TRANSMISSION OPTICAL FILM

摘要

PROBLEM TO BE SOLVED: To easily inspect the presence or absence of the defective section of a light transmission optical film used for a liquid crystal television and a display. SOLUTION: Light La from a light source 1 such as a fluorescent lamp is transmitted through a light diffusion filter 2 where a light transmission section 3 and a light-shielding section 4 including a semi-light-shielding section are provided alternately and is applied to a light transmission optical film 5 used for a liquid crystal display or the like, and the reflected light Lb is examined by visual inspection E or the like, thus inspecting the presence or absence of a defective section 6 of the light transmission optical film 5 due to the generation of abnormal reflected light 8 that floats at a dark section band 7.