Discharge lamp

Abstract

A discharge lamp having a heat transmitting body in a sealed space within the electrodes which can suppress temperature rise of the electrodes certainly, and in which the electrodes do not melt and an arc tube is not blackened, preventing deterioration in radiation output. The discharge lamp has a pair of electrodes (2, 3) arranged opposed to each other in an arc tube (10), and one of electrodes (2) has an electrode main body (20) formed by a sealed space S inside and a heat transmitting body M filled in this sealed space S. A gas introducing through hole (21) which is connected to the outside of the electrode main body and the sealed space S inside is formed in the electrode main body (20), and the tip opening on the electrode main body outside side of the gas introducing through hole (21) is sealed by melting.

Description

technical field [0001] The invention relates to discharge lamps. In particular, it relates to a short-arc discharge lamp used as a light source for a projection device, a photochemical reaction device, and an inspection device. Background technique [0002] From the point of view of the luminescent substance, the distance between the electrodes, and the pressure inside the luminous tube, the discharge lamp can be divided into several categories. Among them, for the luminescent substance, there are xenon lamps with xenon gas as the luminescent substance, mercury lamps with mercury as the luminescent substance, and mercury lamps with mercury as the luminescent substance. Metal halide lamps other than rare earth metals as luminescent substances. [0003] Also, from the viewpoint of the distance between electrodes, there are short-arc discharge lamps and long-arc discharge lamps, and from the viewpoint of the vapor pressure in the arc tube, there are low-pressure discharge lamp...

AI Technical Summary

Problems solved by technology

[0007] Due to the large output of the discharge lamp, the power consumption increases, and the current value of the discharge lamp depends on the design value of the current and voltage, but it will generally increase.

[0008] Therefore, the electrode (especially the anode of DC lighting) will receive more electron impacts, and it will easily heat up and melt, which is a problem that is likely to occur.

[0009] In addition, not only the anode, but also the upper electrode in the discharge lamp arranged in the vertical direction is affected by heat convection in the arc tube, and easily receives heat from the arc.

[0010] In addition, if the electrode, especially its tip part, melts, not only the arc becomes unstable, but also the material constituting the electrode evaporates and adheres to the inner surface of the arc tube, and the radiation output decreases, which is a problem.

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