Discharge lamp

Abstract

This invention provides a discharging lamp. It assuredly suppress temperature rise of the electrode. Therefore, the electrode of discharging lamp will not be melted, the light-emitting tube will not be blackened, and do not cause emission-attenuation output. The discharging lamp provides with a pair of electrodes 2, 3. They are built inside the light-emitting tube 10 oppositely each other. The electrode 2 is comprises an electrode body, in which an airtight space S is formed inside. The heat conductor M is sealed in the airtight space S. The electro-thermal main-body 20 provides with the through hole 21, which connects with outside and inside of the electrode main-body for gas introduction of the airtight space S. The front end opening at outside of the electrode main-body of the through hole 21 for gas introduction is melted and sealed.

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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