Invention Grant
US07586263B2 Discharge lamp having a cathode and emitter assembly composed of tungsten and thorium oxide and joined through a carbide interface region 有权
放电灯具有由钨和氧化钍构成的阴极和发射极组件,并通过碳化物界面区域连接

Discharge lamp having a cathode and emitter assembly composed of tungsten and thorium oxide and joined through a carbide interface region
Abstract:
A high pressure discharge lamp, in which an anode and a cathode are disposed opposite each other in a bulb, achieves a long service life due to thorium (Th) being stably supplied to the cathode tip for a long time after lamp operation has been commence since the formation of the flicker phenomenon is suppressed over a long time due to the cathode being made of tungsten which contains thorium oxide on a surface space from the cathode tip, a carbide layer of tungsten carbide is formed and the cathode being bordered by an emitter containing body of tungsten which contains thorium dioxide, and a carbide layer of tungsten carbide being formed at least in a region bordering the cathode.
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