专利名称：Incandescent lamp with an improved
filament implementation
发明人：Bruce H. Arnold申请号：US07/908071申请日：19920706公开号：US05384510A公开日：19950124
摘要：An incandescent lamp having a plurality of filaments which can effectivelynegate disadvantages of unpredictable operation and complete darkness after failurewhen operated similar to a conventional single filament lamp. In a preferred embodimentof the invention two filaments enclosed within an a suitable envelope are electricallyconnected to incandesce simultaneously. The embodiment having two filaments enclosedwithin an envelope of the lamp has three states: one, both filaments energize
simultaneously and the lamp radiates maximum visible energy; two, first filament fails butthe second filament remains energized and the lamp radiates relatively less visibleenergy; and three, second filament fails and the lamp is completely dark. In state one,the lamp operates similar to a conventional single filament lamp. In state two, the lamp isradiating less visible energy indicating to the user the need to be replaced beforeoccurrence of state three, complete failure of the lamp. The lamp in state two sufficientlyilluminates the area in question with an amount of visible light energy that is stillconsidered safe. In summary, the preferred embodiment warns the user to replace thelamp before complete failure, effectively negating disadvantages of a conventional singlefilament lamp.
申请人：ARNOLD; BRUCE H.
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