| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a prism sheet improved in optical characteristics such as light diffusion property, refractivity and scattering property and specifically usable for a retroreflection sheet usable for a traffic sign, a construction sign, or the like, and for a light guide plate and a diffusion plate used for a backlight of a liquid crystal display device. <P>SOLUTION: The optical sheet is characterized in that an element layer comprising optical elements is composed of at least two sub-layers with different refractive indexes in a resin sheet in which the element layer mounted with at least one of many optical elements transmitting, refracting, scattering or reflecting light is installed on at least one surface of a base material layer. <P>COPYRIGHT: (C)2009,JPO&INPIT |
