ILLUMINATION DEVICE AND ILLUMINATION LENS

摘要

According to an embodiment, an illumination device is provided with a light source (14) and an illumination lens (16) for introducing light emitted from the light source, controlling the introduced light, and emitting the light towards a surface being irradiated. The illumination lens has a concave part (24) to which the light from the light source and which is formed in the center part of the lower side, an outside upper surface (22a) for emitting the introduced light, and an outside wall surface (22b). The concave part (24) is formed by an inside upper surface (24a) and an inside wall surface (24b). At least a part of the light introduced from the light source to the inside wall surface is refracted and emitted upward toward the outside upper surface primarily at the outside wall surface, and light introduced from the inside upper surface is primarily emitted from the outside upper surface.