H - Electricity – 01 – J
Patent
H - Electricity
01
J
H01J 61/56 (2006.01) H01C 7/00 (2006.01) H01J 61/34 (2006.01) H01J 61/82 (2006.01)
Patent
CA 2108986
ABSTRACT: High pressure discharge lamp provided with a thick film resistor in an outer envelope and a thick film resistor therefore. A high pressure discharge lamp having a thick film resistor (34) comprising a plurality of resistive elements. A first resistive element (32) is included in a starting circuit ( 40, 30, 44) for the lamp and a second resistive element (33) is in series with the arc tube during lamp operation for flicker elimination. The integral thick film resistor facilitates mounting and connection of the resistor elements within the lamp envelope (2). Favorably, the resistor substrate has a surface emissivity of greater than about 0.5, and preferably greater than about 0.9, to provide sufficient radiation cooling within an evacuated outer lamp envelope to prevent resistor failure while keeping the size of the resistor small enough for use as a component in an HID lamp. Additionally, a suitable coating of low vapor pressure thickness covers the solder connecting the metallic resistor terminals to the substrate to prevent evaporation of the solder and its deposition on the inner surface of the outer lamp envelope. Fig. 1A
Ravi Jagannathan
Shirasu Kouji
Suzuki Go
Van Bockstal Gerard
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Koninklijke Philips Electronics N.v.
Ngk Insulators Ltd.
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