| abstract |
PROBLEM TO BE SOLVED: To provide an optical film capable of diffusing and preventing reflection of a light source such as a backlight unit, illumination, display, etc., and easily controlling light diffusion, scattering, and transmission, and an illumination device using the same A projection device, a signboard, and an image display device are provided. In a film composed of fine fibers and a matrix resin, the main component of the fine fibers is derived from wood-based cellulose, and the film has a total light transmittance of 70% to 99% and a haze of 5% to 99%. Optical film characterized by having a refractive index difference between fine fiber and matrix resin of 0.01 to 0.15 [Selection] None |