US Patent 8007138 Lighting device

A lighting device can be configured to prevent light beams emitted from a light source from passing through an outer peripheral surface of a lens and from being projected outside of the illumination direction of the lighting device. In the lighting device, the light source can be disposed within a lighting chamber defined by a substrate and the lens. The lens can have a lens cut portion on the rear surface thereof. A reflection surface can be formed in the outer peripheral surface of the lens. The substrate can also have a reflecting portion configured to project light beams reflected by the outer peripheral surface of the lens in the illumination direction. The reflecting portion can be disposed on the front side of the substrate. Light beams emitted from the light source at a certain angle with respect to the main optical axis of the light source cannot be reflected by the lens cut portion but can be reflected by the front surface of the lens toward the outer peripheral surface of the lens to be allowed to pass therethrough.