Patent ID: 9739931
Date: 2017-08-22
CPC Classifications: G02B,G02F

Claim:
1. A lighting device comprising: a light guide plate; an optical sheet configured to diffuse or collect light emitted from the light guide plate; a plurality of hole parts formed in the optical sheet; a housing part formed in a box shape in which one surface thereof has an opening portion, and at least one side of the edge sides of a surface facing the opening portion is a linear shape, wherein the light guide plate and the optical sheet are laminated and housed in the housing part; and a plurality of holding parts which are provided along the linear edge side in the housing part respectively corresponding to the plurality of hole parts to support the optical sheet in the housing part so as to penetrate the corresponding respective hole parts, and are configured so that cross sections thereof parallel to the optical sheet have areas smaller than the cross-sectional areas of the hole parts, wherein a part of the holding parts has an area of cross section which is different from the areas of the cross sections of the other holding parts; and a difference between the area of the cross sections and the cross-sectional areas of the hole parts corresponding thereto is not constant, and some of the cross-sectional areas of the plurality of the holding parts include those that differ from the other cross-sectional area of the holding part, wherein the holding part provided near a center of the edge side has the largest cross-sectional area.