Gas filled discharge tube having a gas filling bore formed...

H - Electricity – 01 – J

Patent

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Details

H01J 17/16 (2006.01) H01J 17/02 (2006.01) H01T 1/00 (2006.01) H01T 13/04 (2006.01) H01T 13/46 (2006.01)

Patent

CA 2064942

The object of the present invention is to provide a gas-filled discharge tube which is capable of making the discharge tube itself smaller to minimize a plug cap that incorporates the discharge tube therein, thereby to realize a minimization of the size of the whole ignition system having a series gap. In order to achieve the above object, the gas-filled discharge tube according to the present invention is constructed such that it comprises a tubular body formed of an electrically insulating material and having a notch portion at least one of the opposite open ends thereof, and a notch or projecting portion at the other open end thereof; a pair of electrode bases, at least one of which is formed of an electrically conducting thin metal sheet, airtightly adhered to the respective open ends; and a pair of discharge electrodes having flange portions to be engageably fixed with the notch and/or projecting portions and sandwiched between the tubular body and the respective electrode bases, and with this construction, the electrode base is first formed with a gas filling bore by a laser beam for filling an inert gas, which bore being welded also by the laser beam after the inert gas is filled in the tubular body so as to enclose the gas therein. 17

La présente invention porte sur un tube à décharge rempli de gaz et capable de rendre le tube à décharge lui-même plus petit pour minimiser un capuchon qui incorpore le tube à décharge, ce qui permet de réduire au minimum la taille de tout le système d'allumage ayant un écartement de série. En vue d'atteindre l'objectif ci-dessus, on construit le tube à décharge rempli de gaz de la présente invention de manière qu'il comporte un corps tubulaire constitué d'un matériau électriquement isolant et ayant une partie à encoche à au moins l'un de ses bouts ouverts opposés, et une partie à encoche ou à saillie à l'autre bout ouvert; une paire de bases d'électrode dont au moins une est constituée d'une mince tôle conductrice qui adhère de façon étanche aux bouts ouverts respectifs; et une paire d'électrodes de décharge ayant des rebords qui se fixent aux encoches et/ou aux saillies et se coïncent entre le corps tubulaire et les bases d'électrode respectives et, avec cette construction, la base d'électrode est d'abord percée au rayon laser d'un orifice pour le remplissage au gaz inerte, puis l'orifice est soudé également au rayon laser après le remplissage au gaz inerte de manière à y enfermer le gaz.

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