SHORT ARC TYPE DISCHARGE LAMP

• Main Author: KANEKO TOSHIO
• Format: Patent
• Language: English; Japanese
• Published: 09.04.2015
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS; ELECTRICITY

PROBLEM TO BE SOLVED: To provide a short arc type discharge lamp including: a glass light emission tube; a pair of glass sealing tubes at respective ends thereof; and a pair of opposing electrodes in the light emission tube; with a structure preventing re-crystallization of glass near a metal electrode core wire holding body in each of the sealing tubes with a heat insulation film formed on an outer surface near a border between the light emission tube and each of the sealing tubes by keeping the electrode core wire holding body away from a heat insulation effect of the heat insulation film, which may cause the electrode core wire holding body to be abnormal overheated.SOLUTION: A short arc type discharge lamp is provided with a heat insulation film formed on a light emission tube side away from a tip surface of a metal electrode core wire holding body in a sealing part. 【課題】ガラス製の発光管と、その両端のガラス製の封止管と、前記発光管内に対向配置された一対の電極と、を備えたショートアーク型放電ランプにおいて、封止管内に配置した電極芯線保持体を金属製とし、発光管と封止管の境界近傍の外表面に保温膜を形成したときに、保温膜による保温効果の影響を受けて電極芯線保持体が異常に過熱されることがなく、その近傍のガラスに再結晶が起きないようにした構造を提供することである。【解決手段】保温膜を、封止部内に配置された金属製の電極芯線保持体の先端面よりも発光管側に形成したことを特徴とする。【選択図】 図１