Abstract:
A discharge lamp includes a cathode in a luminous tube, and an emitter, other than thorium, is added to the cathode. The emitter is prevented from being excessively vaporized from the cathode and depleted soon. Smooth lighting is enabled even at start-up. A main body part (31) of the cathode (3) is made from a metallic material having a high melting point and containing no thorium. A front end (32) is made from a metallic material having a high melting point and containing an emitter (excepting thorium). Inside a sealed space (33) formed in the main body part (31) and/or the front end part (32) is received a sintered compact (34) containing an emitter (excepting thorium) that is higher in concentration than the emitter contained in the front end part (32).
Abstract:
The invention relates to a method of manufacturing cathode skirts of low power electron guns comprising a thermal annealing step in which a realisation step of surface irregularities on the outer face of each skirt is provided, before the said thermal annealing. According to one embodiment of the invention this step comprises a chemical attack of the skirts to treat by annealing. Applications: Television tubes
Abstract:
An electron source excellent in the uniformity in current emission distribution is provided certainly and at a low cost. A process for producing an electron source having an electron emitting portion at one end of a rod, which comprises a step of forming the electron emitting portion by machining, and a step of removing a damaged layer at the surface of the formed electron emitting portion by chemical polishing or electrolytic polishing.
Abstract:
A fluorescent lamp (10) is formed by winding a coil (30) using first, and second mandrels (45,46), and optionally a third mandrel. The coil (30) is wound around the second mandrel (46) to provide a coil density of at least 95 %. The coil (30) is able to carry an amount of emitter material (32) of about 0.6-1.6 mg/ cm of coil (30). This has been found to lead to substantially increased lamp life, on both instant and rapid start circuits.
Abstract:
A method for manufacturing a discharge lamp in which a tungsten rod (16) disposed in a closed emission space is cut by fusion at a predetermined portion by using a laser to form a pair of electrodes. The fusion-cutting step of cutting the tungsten rod (16) to serve as a pair of electrodes is executed after the temperature of the whole arc tube rises to the temperature at which at least an emission material such as mercury (118) sealed in the arc tube evaporate. Thus the arc tube is charged with the vapor of the emission material, and tungsten of the electrode material evaporated by the laser beam fusion is prevented from adhering to the inner wall of the arc tube.
Abstract:
A fluorescent lamp (10) is formed by winding a coil (30) using first, and second mandrels (45,46), and optionally a third mandrel. The coil (30) is wound around the second mandrel (46) to provide a coil density of at least 95 %. The coil (30) is able to carry an amount of emitter material (32) of about 0.6-1.6 mg/ cm of coil (30). This has been found to lead to substantially increased lamp life, on both instant and rapid start circuits.
Abstract translation:荧光灯(10)通过使用第一和第二心轴(45,46)以及任选地第三心轴卷绕线圈(30)而形成。 线圈(30)围绕第二心轴(46)缠绕以提供至少95%的线圈密度。 线圈(30)能够承载大约0.6-1.6mg / cm 2的线圈(30)的发射极材料(32)的量。 已经发现,在即时启动电路和快速启动电路上都会导致灯泡寿命显着增加。
Abstract:
A tungsten wire containing 1 to 10% by mass of rhenium has a point which indicates a 2% elongation within a quadrangle formed by joining points with straight lines, where the values of x and y are point (20, 75), point (20, 87), point (90, 75), and point (90, 58), in this order, wherein the wire diameter of the aforementioned tungsten wire is represented by x µm, and the elongation of the tungsten wire is 2% after electrically heating with an electrical current which is a ratio of y% to the fusion current (FC) at the wire diameter x µm, and wherein a semi-logarithmic system of coordinates is expressed by a horizontal axis using a logarithmic scale of the aforementioned wire diameter x and a vertical axis using a normal scale of ratio y to the fusion current. According to the above-described configuration, a tungsten wire having a great elongation even under conditions of high temperature can be provided, and the tungsten wire can exhibit an excellent durability when used as component material for constituting cathode heaters and so forth, and the tungsten wire can be manufactured efficiently.