LIGHT DIFFUSION FILM LAMINATE

摘要

PROBLEM TO BE SOLVED: To provide a light diffusion film laminate having a specific optical characteristic and composition that can ensure high luminance and illuminance and can make a fleck of the luminance and illuminance smaller when it is used in a surface light source device.

SOLUTION: A light diffusion film laminate is formed by laminating an internal light diffusion film that simultaneously satisfies (i) to (iii) below and a base material whose total light transmittance of light with a wavelength of 550 nm is 50 to 100%, and has no air space at an interface between them: (i) the total light transmittance of light with a wavelength of 550 nm is 40 to 84%; (ii) a rate (I30/I0×100) of transmission (I30) of light with a wavelength of 550 nm in a main diffusion direction at 30 degrees of output angle to transmission (I0) thereof at 0 degree of output angle is 8.0 to 95%; and (iii) a rate of inflection of light with a wavelength of 550 nm is 4.0 to 100%.

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