Method of and apparatus for electrodeless discharge excitation

Details Method of and apparatus for electrodeless discharge excitation Method of and apparatus for electrodeless discharge excitation

H - Electricity

01

J

313/111, 315/48,

H01J 65/00 (2006.01) H01J 65/04 (2006.01)

Patent

CA 1131689

20,341 METHODS OF AND APPARATUS FOR ELECTRODELESS DISCHARGE EXCITATION ABSTRACT OF THE DISCLOSURE A light source includes an electrodeless lamp having a generally cylindrically shaped envelope made of a light trans- mitting substance. A volatile fill material, enclosed within the envelope, emits light upon breakdown and excitation. A termina- tion fixture has an outer conductor disposed around its inner conductor, both conductors having a first end which couples power to the lamp and a second end coupled to an alternating current power source. A first end of a conductive helix is coupled to the first end of the inner conductor, a second end of the helix being open-circuited. The helix has an electrical length whereby axial electric field maxima and minima occur thereon. The envelope is oriented centrally and axially within the helix so that opposed ends of the envelope are aligned with axial electric field minima and an axial, non-toroidal arc occurs within the envelope, but does not attach to its interior walls, thereby enhancing the life of the lamp. The helix can take various forms, such as constant or continuously varying. A small spherical conductor can be affixed to the second end of the helix to inhibit electrical breakdown from an otherwise sharp end.

330873

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