Patent ID: 8355092
Filing Date: 2013-01-15
Classification: G02B,G02F

Abstract:
1. An optical member, comprising: a diffusion layer diffusing light emitted from a light source; a first light collection layer that is disposed on a light-emission side of the diffusion layer, that has a plurality of first projection portions extending in a direction and arranged with a predetermined period, and that refracts and collects light incident thereon from the light diffusion layer by using the first projection portions; a first reflection layer that has a plurality of first reflection portions so arranged, with a same period as the first projection portions, as to face boundaries between adjacent first projection portions, that is disposed between the diffusion layer and the first light collection layer, and that reflects light emitted from the diffusion layer by using the first reflection portions; a second light collection layer that is disposed on a light-emission side of the first light collection layer, that has a plurality of second projection portions extending in a period direction of the first projection portions and arranged with a predetermined period, and that refracts and collects light incident thereon from the first light collection layer by using the second projection portions; and a second reflection layer that has a plurality of second reflection portions so arranged, with a same period as the second projection portions, as to face boundaries between adjacent second projection portions, that is disposed between the first light collection layer and the second light collection layer, and that reflects light emitted from the first light collection layer by using the second reflection portions, wherein a width of each of the second reflection portions in a period direction is smaller than a width of each of the first reflection portions in a period direction.