Discharge lamp

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PROBLEM TO BE SOLVED : the inside of the arc tube, and the cathode and anode are oppositely arranged in a discharge lamp, other than the cathode emitter of thorium added, by preventing the early depletion of the emitter, electron emission function is maintained for a long time, the flicker of the life of the lamp and, at the beginning of a starting of the lighting of the lights. SOLUTION : the cathode 3 is, in the main body portion 31 and the front end side thereof and a tip part 32 consists of a joint, the main body part, not containing thorium is composed of a high melting point metal material, and the tip part, emitter (except the thorium) containing also a high melting point metal material, the body part and/or inside the tip formed in a hermetically closed space 33, containing the tip of an emitter concentration is higher than that of the emitter (except the thorium) containing a sintered body 34 is embedded, the sintered body, including rare earth compound oxide and characterized. Selected drawing : fig. 2