Discharge lamp

Abstract

The invention provides a discharge lamp. The strength of an internal wire rod is sufficiently high to prevent the internal wire rod from being broken off. The electric discharge lamp consists of the following components: a discharge vessel (1), a sealing tube (12) connected with two ends of a luminous tube (11); a metal plate (5), configured to be arranged in the sealing tube (12); a tungsten internal wire rod (3), wherein an electrode (2) is arranged on the front end of the internal wire rod and the back end side of the internal wire rod on the opposite side of the electrode passes through a perforation hole formed in the center of the metal plate (5) and is fixed on the metal plate (5); a glass holding cylinder (4) held and arranged on the internal wire rod (3) between the outer periphery of the internal wire rod (3) and the inner periphery of the sealing tube (12), wherein the metal plate (5) is fixed on the internal wire rod (3) by a welding material and the crystal particle size of the part of the internal wire rod which projects from the holding cylinder (4) towards the luminous tube (11) side is smaller than the crystal particle size of the part of the internal wire rod which is fixed with the metal plate.

Description

technical field [0001] The present invention relates to a discharge lamp, and more particularly, to a discharge lamp having a hermetically sealed structure suitable for high current. Background technique [0002] Discharge lamps, such as discharge lamps in which mercury is sealed in a luminous tube, are widely used in fields utilizing ultraviolet rays, such as photochemical industry fields, semiconductor device manufacturing fields, and other fields. [0003] In a discharge lamp using a large current, the amount of mercury enclosed as the main component of the luminous gas is large, and the pressure inside the luminous tube during lighting is very high, and the heat generation is large. Therefore, the glass of the hermetic sealing part in particular needs to have High heat resistance and pressure resistance. Next, since the mercury in the arc tube needs to be completely evaporated during lighting, there is no low-temperature portion where mercury needs to condense in the ar...

AI Technical Summary

Problems solved by technology

[0025] As a result, the brittle fracture strength of the inner lead rod 3 is reduced, and the portion protruding from the holding cylinder 4 to the arc tube side ( Image 6 The area shown in A), that is, the front end side of the holding cylinder 4, there is a problem that the inner lead rod 3 is easy to break

Images