Patent ID: 8167476

Claim:
A light source device comprising: a plurality of point light sources for emitting light; a light source substrate having a front surface and a rear surface, and directly mounting the plurality of point light sources, the plurality of the point light sources being arranged along a longitudinal axis of the light source substrate; a light source substrate cover having a rear surface, and a plurality of through holes or a plurality of notches in positions to which the plurality of point light sources correspond, the light source substrate cover arranged opposite to the front surface of the light source substrate on which the plurality of point light sources are mounted, the rear surface of the light source substrate cover facing the front surface of the light source substrate and covering the light source substrate, without the plurality of through holes or the plurality of notches corresponding to the plurality of the point light sources covering the light source substrate; and a support member for supporting the light source substrate, the support member arranged to be opposed to the rear surface of the light source substrate, the support member corresponding in size to the light source substrate and having a front surface, which faces the light source substrate, wherein the light source substrate cover and the support member hold the light source substrate by sandwiching the light source substrate, an entirety of the front surface of the light source substrate being flush with the rear surface of the light source substrate cover, and an entirety of the rear surface of the light source substrate being flush with the front surface of the support member, wherein a projection is arranged on part of the light source substrate cover or the support member, and a first recessed part, which includes a step and is fitted into the projection, is arranged on part of the support member or the light source substrate cover, and the light source substrate cover and the support member are engaged to each other, and wherein the light source substrate includes a second recessed part, which is provided at a position to which the projection and the first recessed part correspond, the projection passing through the second recessed part and engaging with the first recessed part.