Patent ID: 8950920
Filing Date: 2015-02-10
Classification: G02B,G02F,G09F

Abstract:
1. A light reflector comprising: a multilayer film wherein the multilayer film comprises a substrate layer (A) and an emission line preventing layer (B) having a scale-like light reflecting section, wherein the substrate layer (A) comprises a thermoplastic resin and a filler, a concentration of the filler in the substrate layer (A) is from 5 to 75% by weight, the filler comprises at least one of an inorganic filler having a mean particle size of from 0.05 to 1.5 μm and an organic filler having a mean dispersed particle size of from 0.05 to 1.5 μm, the emission line preventing layer (B) comprises a thermoplastic resin and a filler, a concentration of the filler in the emission line preventing layer (B) is from 1 to 40% by weight, and the filler comprises at least one of an inorganic filler having a mean particle size of from 0.05 to 20 μm and an organic filler having a mean dispersed particle size of from 0.05 to 20 μm, wherein the light reflector has a reflection angle light quantity ratio Q of 1.5 to 6.5, which is indicated by formula 1: wherein Q 1 and Q 2 in the formula 1 each are indicated by formulae 2 and 3, respectively: wherein U 15 , U 30 and U 45 in the formulae 2 and 3 each are indicated by formulae 4 to 6, respectively: wherein S 15 , S 30 and S 45 in the formulae 4 to 6 each represent a light quantity value as measured, when a light is applied from a light source placed at a position spaced from the light reflector to a side of the emission line preventing layer (B) of the light reflector, at a position on a path of the light as regularly reflected at a reflection angle of 15°, 30° or 45°, respectively, from the light reflector and spaced from a light reflection point by the same distance, and the multilayer film has a porosity, as indicated by formula 7, which is from 30 to 70%: wherein ρ0 in the formula 7 represents a true density of the multilayer film, and ρ in the formula 7 represents a density of the multilayer film.