Ultra-small transition sealing medium pressure mercury lamp and its transition joint sealing process

Abstract

The invention discloses a microminiature transition sealing intermediate-pressure mercury lamp and a transition joint sealing process thereof. The microminiature transition sealing intermediate-pressure mercury lamp employs a tungsten rod sealing structure, can ensure coaxiality between a cathode and an anode and is good in support strength; the transition joint sealing process makes it possible that the microminiature transition sealing intermediate-pressure mercury lamp employs the tungsten rod sealing structure, employs a magnesium fluoride tube as an intermediate auxiliary sealing tool, prevent a hollow structure from formation failure due to glass adhesion, can pull out the magnesium fluoride tube easily after formation of glass since magnesium fluoride and the glass are not adhered, and formation of a transition joint is not affected; and since the expansion coefficient of a tungsten rod is greater than the expansion coefficient of quartz and a lamp tube is often made of quartz, the transition joint forms a multichannel transition structure so as to realize gradual transition by use of multiple materials, finally, a quartz tube made of a quartz material is formed at the tail portion of the transition joint, fixation of the tungsten rod and the lamp tube made of the quart material are not affected by the expansion coefficients, and the fixation is firmer.

Description

technical field [0001] The invention relates to an ultra-small transition sealing medium-pressure mercury lamp and a transition joint sealing process thereof. Background technique [0002] The size of the ultra-small medium-pressure mercury lamp is small. Generally, when the outer diameter of the lamp tube is less than 20mm, if a tungsten rod is used to connect the electrodes, the size of the sealing structure of the tungsten rod will be smaller. In the prior art, such an ultra-small sealing structure cannot be realized, because when the size is small, the glass sealing will stick inside and cannot form a hollow structure, making it difficult for the tungsten rod to pass through. However, if the molybdenum sheet is used to connect the electrodes, the molybdenum sheet can only be sealed by compression sealing. Since the molybdenum sheet is thin, the structure after sealing is still not enough for the support strength of the electrode and the lamp cap, and the compression seal...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: in order to overcome the deficiency that the ultra-small medium-pressure mercury lamp cannot be produced in the prior art, the present invention provides an ultra-small transition-sealed medium-pressure mercury lamp and its transition joint sealing process

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