Patent ID: 8508130

Claim:
A short arc type discharge lamp, comprising: a body member that comprises an electrical discharge space and a concave portion, the concave portion forms the outer bounder of the electrical discharge space and a curved reflective face; a light permeable member that closes a front opening of the body member; and a pair of an anode and a cathode that is arranged in the electrical discharge space and forms a gap therebetween at a focal position of the curved reflective face; the cathode comprises a cathode tip portion that is approximately conic and a cathode rod portion that is continuous from the cathode tip portion, the anode comprises an anode tip portion that contains a tapering portion and a flat tip portion, the tapering portion tapers toward the flat tip portion, an outer diameter of the flat tip portion is smaller than an outer diameter of the cathode rod portion, and an outer diameter of a back end of the anode tip portion is larger than the outer diameter the cathode rod portion.