Electric lamp and discharge devices: systems – Plural load device systems – Electric switch in the supply circuit
Patent
1984-07-09
1986-11-25
Dixon, Harold
Electric lamp and discharge devices: systems
Plural load device systems
Electric switch in the supply circuit
315211, 315217, 315324, 315DIG1, H05B 3700
Patent
active
046251529
ABSTRACT:
A tricolor fluorescent lamp operating on a DC power source is disclosed herein. The lamp comprises an outer envelop defining therein a sealed space in which an ionizable medium is filled at low pressure. Disposed within said outer envelop are three tubular envelops of a generally inverted U-shaped configuration which define correspondingly three separate discharge paths and which are coated with respective fluorescent substances emitting different colors. Three sequentially energized anodes are located within the sealed ends of the respective envelops and a common cathode is disposed in adjacently facing relation with the open ends of the envelops, such that the three envelops can be sequentially energized to emit the specific colors which are additively mixed in various proportions to produce a desired color as emitting from the whole lamp. Said U-shaped configuration of the tubular envelops emitting different colors results in the elongated discharge paths or increased light emitting surfaces within a limited space, providing a compact arrangement of the tricolor lamp to be well suitable for decorative illumination. Also, the bent portions of the U-shaped envelops are cooperative to provide a viewing surface on which all three color emitting sources can appear, which renders the tricolor lamp to be well adaptable for use as a picture element in a color display. Further, the sequential shifting of the discharge paths allows the common cathode to be constantly energized, preventing irregular color reproduction which would otherwise result from the interruption in energizing the cathode during the course of changing the colors to be emitted from the lamp.
REFERENCES:
patent: 1932509 (1933-10-01), Cadieux
patent: 3609436 (1971-09-01), Campbell
patent: 4199708 (1980-04-01), Lauwerijesser
Dixon Harold
Matsushita Electric & Works Ltd.
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