Title: Starting arrangement for high pressure discharge sodium lamp

Abstract: High-pressure-discharge (HID) sodium lamp has a starting aid comprising a plug-like ceramic member extending through the longitudinal wall of the arc tube proximate one of the lamp electrodes. The plug-like ceramic member is fused to the alumina arc tube and is electrically conductive by virtue of having embedded therein a small percentage of finely divided refractory metal. At least during lamp starting, the plug-like ceramic starting aid is electrically connected through a resistor to the opposite lamp electrode and, as a result, on application of energizing potential, a glow discharge is established between the interior surface of the plug-like ceramic member and the proximate lamp electrode to ionize the atmosphere within the arc tube to facilitate lamp starting.

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Inventors: Larson, Daniel A. (Cedar Grove, NJ, US)

Application Number: 948131
Filing Date: 1978-10-03
Publication_date: 1980-03-04
Assignee: Westinghouse Electric Corp. (Pittsburgh, PA)
Primary Class(es): 315/51 313/601, 315/60, 315/73
Other Classes:
US Patent Ref:

3226597	Dec, 1965	Green	315/60.
3281309	Oct, 1966	Ross	313/221.
3461334	Aug, 1969	Knochel et al.	313/198.
3469729	Sep, 1969	Grekila et al.	220/2.
3480823	Nov, 1969	Chen	313/823.
3746914	Jul, 1973	Olson et al.	315/47.
4103200	Jul, 1978	Bhalla	313/221.

Other Refs: 231685747-4938249-102573

Oct, 1974	DE.
Dec, 1972	JP.
Sep, 1974	JP.

Primary Examiner: Smith, Alfred E.
Assistant Examiner: Roberts, Charles F.
Attorney: Palmer; W. D.