| (11) | EP 0 940 842 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Coaxial applicators for electrodeless high intensity discharge lamps |
(57) An electrodeless lamp assembly (10) includes an electrodeless, high intensity discharge lamp capsule (12) and a coaxial electric field applicator (16). The coaxial electric field applicator (16) includes an outer conductor assembly (30) including a tubular outer conductor (34) having a distal end (342) disposed at or near a first end of the lamp capsule (12), an outer ring (36) disposed at or near a second end of the lamp capsule (12), and a plurality of cage wires (40) connected between the outer ring (36) and the tubular outer conductor (34). A center conductor assembly (28) includes a center conductor (32) coaxially positioned with respect to the tubular outer conductor (34) and has a distal end (322) disposed at or near the first end of the lamp capsule (12). High frequency power, supplied to the tubular outer conductor (34) and the center conductor (32), is coupled by the electric field applicator (16) to the lamp capsule (12). The center conductor assembly (28) may include a guard ring (210) positioned near the first end of the lamp capsule (12) for concentrating electric fields in the lamp capsule (12). |