Patent ID: 8596831

Claim:
A light beam controlling member comprising: an incident area into which light emitted from a light source enters; and an exit area positioned on a side opposite to the incident area in an optical axis direction that emits the light that has entered the incident area towards a surface to be irradiated, wherein the incident area has a plurality of projecting sections that are adjacent to one another in a radial direction, such that a shape when viewed from the optical axis direction is a concentric ring shape of which the center is the optical axis, and a cross-sectional shape including the optical axis is a serrated shape, and the projecting section has a first surface into which the light emitted from the light source enters and that refracts the light that has entered; a second surface formed in an outer side position in the radial direction with reference to the optical axis in relation to the first surface and that totally reflects the light that has entered from the first surface towards the exit area; and a third surface disposed between the first surface and the second surface such as to be joined with an end section on the light source side of both the first surface and the second surface, into which the light emitted from the light source enters, and the third surface is formed into an angled surface that is angled in relation to the optical axis, of which one end section joined with the first surface is positioned further to the light source side in the optical axis direction than another end section joined with the second surface, and the light that has entered the third surface of each of the plurality of projecting sections is refracted to the exit area side with positive power by the third surfaces as a whole.