Compact fluorescent light source having metallized electrodes

Details Compact fluorescent light source having metallized electrodes Compact fluorescent light source having metallized electrodes

H - Electricity

05

B

313/11, 315/38,

H05B 41/24 (2006.01) H01J 65/04 (2006.01)

Patent

CA 1149078

22,142 Abstract of the Disclosure Light source wherein high frequency power is capaci- tively coupled to a low pressure discharge includes at least one metallized power coupling conductor. A dis- charge lamp includes an envelope which is typically pear- shaped with a re-entrant cavity. The lamp envelope encloses a fill material which forms during discharge a plasma which emits ultraviolet radiation and typically includes on its inner surface a phosphor coating. An outer conductor is disposed around the outer surface of the lamp envelope. A conductive coating disposed on the inner surface of the re-entrant cavity forms the inner conductor. The outer conductor can be a conductive mesh or can be a conductive coating disposed on the outer surface of the lamp envelope in a pattern which permits light to escape from the lamp. When the conductive coat- ing of the inner conductor is substantially more than one skin depth in thickness at the frequency of operation, the re-entrant cavity is substantially field-free and can be used to house power source circuitry. When the conduc- tive coating of the outer conductor is substantially more than one skin depth in thickness at the frequency of operation, the light source is prevented from radiating high frequency power. A high frequency power source can be included in the light source.

363585

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