Patent ID: 7819533

Claim:
A light source unit, comprising: a reflector having an opening for housing a lamp and an opening for radiating light, the reflector having an inner surface subjected to mirror surface working to be shaped in a polynomial surface; a light source having an electrode therein, the light source comprising a bulb for emitting light and an electrode introducing unit for guiding the electrode to the bulb, the light source being inserted into the reflector from the opening for housing the lamp; and a condenser lens for condensing the light emitted from the reflector, the condenser lens being disposed so as to be located on an optical axis of light emitted from the light source; wherein the bulb is disposed so that focus positions of the emitted light reflected by an inner wall of the reflector are not located on the electrode introducing unit, are not located on the condenser lens, and are located between the opening for radiating light from the reflector and a radiated light receiving surface of the condenser lens, the focus positions of the emitted light being on a circle around the optical axis with the optical axis as a center of the circle.