Integral imaging lens sheets

摘要

A method, and apparatus and lens sheet manufacturing process which utilize the method, of evaluating the quality of a lenticular lens sheet having a front side carrying a plurality of elongated parallel lens elements, and a back side. The method includes: (a) illuminating the sheet from one of the sides with a light source so that the light passes through the sheet and is then reflected from a reflector behind the other side to pass back through the sheet; and (b) comparing an observed feature of a pattern of the reflected light which has passed back through the sheet with a corresponding reference feature to provide an indication of the lenticular lens sheet quality.