Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Load device and impedance
Patent
1992-10-26
1994-07-19
Mullins, James B.
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Load device and impedance
315 46, 315 47, 315 50, 315 52, 315 58, 315 60, 315 73, 338308, H01J 744
Patent
active
053312503
ABSTRACT:
A high pressure discharge lamp having a thick film resistor comprising a plurality of resistive elements. A first resistive element is included in a starting circuit for the lamp and a second resistive element 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. 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.
REFERENCES:
patent: 4734612 (1988-03-01), Sasaki et al.
patent: 5159242 (1992-10-01), Ravi
Ravi Jagannathan
Shirasu Kouji
Suzuki Go
Van Bockstal Gerard
Dudek J.
Mullins James B.
NGK Insulators Ltd.
North American Philips Corporation
Wieghaus Brian J.
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