Subminiature SMT (surface mount device) type gas discharge tube
A gas discharge tube, chip-type technology, applied in the direction of solid cathode components, etc., can solve the problem of low DC breakdown voltage, achieve the effect of reducing DC breakdown voltage, small size, and good inter-electrode capacitance parameters
Inactive Publication Date: 2012-08-15
镇江市电子管厂
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Problems solved by technology
But at present, the minimum DC breakdown voltage of gas discharge tubes in the world can only reach 75V (International Telecommunication Union standard ITU-T k.12 and national standard GB9043-2008), which is difficult to meet the DC breakdown of some special signal protection fields Performance requirements for lower voltage
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[0013] As shown in the figure, the ultra-miniature chip-type gas discharge tube includes a ceramic tube 1 in the shape of a cuboid, and the outer dimensions of the ceramic tube are only 1.6×1.6×3.2 mm. The two ends of the ceramic tube are provided with metal electrodes 2, and the end faces of the metal electrodes and the ceramic tube are welded and sealed by solder 3, and a gas medium 4 is filled between the two metal electrodes; coated with a metal oxide coating 6 . A cross-shaped groove 5 is formed on the inner end surface of the metal electrode to improve the adhesion strength of the metal oxide coating 6 . The gas medium 4 is a mixed gas of neon and hydrogen, and the mixing volume ratio of neon and hydrogen is 95:5. The metal oxide coating 6 is composed of various metal oxide powders without mixing, and its composition and mass parts are: 1 part of titanium oxide, 0.6 part of cesium oxide, 2 parts of barium oxide, and 0.2 part of ytterbium oxide.
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The invention relates to a gas discharge tube, and particularly relates to a subminiature SMT (surface mount device) type gas discharge tube. The subminiature SMT type gas discharge tube comprises a cuboid-shaped ceramic tube, the two ends of the ceramic tube are respectively provided with a metal electrode, the metal electrodes and the end faces of the ceramic tube are subjected to welded seal through welding fluxes, and a gas medium is filled between the two metal electrodes; and the inner side of the metal electrode is cylindrical, and the end face of the inner side of the metal electrode is coated with a metal oxide coating. The gas discharge tube disclosed by the invention is not only compact in structure and small in size, but also can be used for effectively reducing the direct-current breakdown voltage of an element through combining a special electrode structure with the gas medium and the metal oxide coating which are reasonably matched; and meanwhile, good interelectrode capacitance parameters can be obtained.
Description
technical field [0001] The invention relates to a gas discharge tube, in particular to an ultra-small patch type gas discharge tube. Background technique [0002] SMD gas discharge tube is a gas discharge device with a cermet structure that is filled with an appropriate inert gas medium in the discharge gap between the electrodes, equipped with a highly active electron emission material and a discharge ignition structure, and sealed. . It can be used for instantaneous overvoltage surge protection, and can also be used as ignition. Its high impedance, low inter-electrode capacitance and high impact current resistance are not available in other discharge tubes. When the line has an instantaneous overvoltage, the discharge tube is broken down, and the impedance drops rapidly, almost in a short circuit state. [0003] Since the patch gas discharge tube is exposed in the air, it is greatly affected by the ambient temperature and humidity, and the smaller the volume of the patc...
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IPC IPC(8): H01J17/16H01J17/04H01J17/20
Inventor 王江祥刘发远刘俊吴光发
Owner 镇江市电子管厂