Patent ID: 7821209

Claim:
A light source unit comprising: a discharge light source tube having discharge electrodes provided one in each end portion of an insulating tube whose interior is filled with a discharge gas; and an inductance element that is electrically connected to at least one of the discharge electrodes of the discharge light source tube; wherein the insulating tube includes leads, one end of each of the leads is connected to a corresponding one of the discharge electrodes and the other end of each of the leads extends out of the insulating tube; the inductance element includes at least one of an electrically conductive ring and an electrically conductive tube disposed around at least one of the leads; and the at least one of the electrically conductive ring and the electrically conductive tube is arranged such that a magnetic flux generated by current flowing through the leads penetrates a closed circuit defined by the at least one of the electrically conductive ring and the electrically conductive tube.