Patent ID: 7040768

Claim:
A light source unit, comprising: an arc tube having a light emitting section in which discharging emission is performed between electrodes; a first reflecting mirror to emit a luminous flux radiated from the arc tube in a certain uniform direction; and a second reflecting mirror provided on an opposite side of the light emitting section from the first reflecting mirror, the first reflecting mirror including a reflecting surface in the form of an elliptic curved surface, the reflecting surface of the first reflecting mirror having a first focal point and a second focal point, a center of discharging emission between the electrodes not matching the first focal point of the first reflecting mirror, a center of the source of reflected light from the second reflecting mirror, formed by the luminous flux emitted from the center of discharging emission between the electrodes and reflected from the second reflecting mirror, not matching the center of light emission between the electrodes and the first focal point of the first reflecting mirror, and the center of discharging emission between the electrodes, the first focal point of the first reflecting mirror, and the center of the source of reflected light from the second reflecting mirror, being aligned on a straight line perpendicular to a straight line connecting the first focal point and the second focal point of the first reflecting mirror.