Starting aid for low wattage metal halide lamps
View Patent ↗An arc discharge lamp ( 60 ) contains an arc tube ( 62 ) containing an arc generating and sustaining medium. The arc tube ( 62 ) has at least one press seal ( 64 ). Means ( 66 ) for coupling electrical energy to the interior of the arc tube includes an electrical current-carrying frame member ( 68 ) and in-leads ( 68 a ) and ( 68 b ) sealed into the lamp stem ( 90 ) and connected to a base (not shown). A starting source ( 70 ) comprises a sealed cavity ( 72 ) formed in the press seal ( 64 ). A second fill material is contained within the sealed cavity ( 72 ). The starting source ( 70 ) emits ultraviolet radiation when the lamp ( 60 ) is energized, which assists in initiation of the arc discharge within the interior of the arc tube ( 62 ). An electrical energy coupler ( 74 ) is provided for coupling electrical energy to the sealed cavity ( 72 ). The electrical energy coupler ( 74 ) comprises an electrically conducting element ( 76 ) having a proximal end ( 78 ) affixed to the electrical current-carrying frame ( 68 ) and a distal end ( 80 ) overlying the starting source ( 70 ), thus providing a capacitve coupling.
1. In an arc discharge lamp, an arc tube having: a light transmissive arc tube containing an arc generating and sustaining medium, said arc tube including at least one press seal; means for coupling electrical energy to an interior of said arc tube including an electrical current-carrying flame member; a starting source comprising a sealed cavity in said press seal; a second fill material in said sealed cavity, said starting source emitting ultraviolet radiation which assists in initiation of an arc discharge within the interior of said arc tube; and an electrical energy coupler for coupling electrical energy to said sealed cavity, the improvement comprising:
said electrical energy coupler comprising an electrically conducting element having a proximal end affixed to said electrical current-carrying frame and a distal end overlying said starting source.
2. The arc discharge lamp of claim 1 wherein said electrically conducting element comprises a bimetallic ribbon.
3. The arc discharge lamp of claim 1 wherein said electrically conducting element is a nickel ribbon.