Optical film for 3D image, apparatus for manufacturing optical film, and method for manufacturing optical film, Advertising board made of optical film

摘要

It has excellent optical properties and can form various three-dimensional images. Manufacture of optical films for stereoscopic images that can be widely used in various areas such as sign boards, advertisement exhibition halls, and exhibition boxes by using the method to form three-dimensional security patterns, and optical films that can quickly and efficiently manufacture such optical films An apparatus, a method for manufacturing an optical film, and an advertisement board made of the optical film are provided. The optical film for a stereoscopic image includes a base film layer, and a lens array comprising a plurality of microlenses protruding from one surface of the base film layer, and a gap partitioning between the microlenses so that the microlenses are spaced apart from each other, The ratio b/a of the thickness b of the microlens to the diameter a of the lens is 0.5 or more, and the ratio b/c of the thickness b of the microlens to the gap c is 1 or more.