Short-arc discharge lamp with starting device
First Claim
1. An arc discharge lamp comprising an envelope having a bulb portion and an elongated stem extending from said bulb portion, and first and second electrodes extending into said envelope and spaced apart therein in said bulb portion to define an arc discharge path, said first electrode being part of an elongated electrode structure hermetically sealed in said stem at a region thereof spaced from said bulb portion, said first electrode extending through said stem from said seal region and into said bulb portion, wherein the improvement comprises a starting device of electrically conductive material positioned externally of said envelope and connected electrically to said second electrode and extending from said second electrode to and fitting around and substantially encircling said stem alongside said first electrode between said seal region and said bulb portion.
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Accused Products
Abstract
A short-arc discharge lamp having a pair of electrodes sealed into a bulb, and an external starting device comprising an electrical conductor connected to one of the electrodes and extending to the vicinity of the seal of the other electrode.
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Citations
11 Claims
- 1. An arc discharge lamp comprising an envelope having a bulb portion and an elongated stem extending from said bulb portion, and first and second electrodes extending into said envelope and spaced apart therein in said bulb portion to define an arc discharge path, said first electrode being part of an elongated electrode structure hermetically sealed in said stem at a region thereof spaced from said bulb portion, said first electrode extending through said stem from said seal region and into said bulb portion, wherein the improvement comprises a starting device of electrically conductive material positioned externally of said envelope and connected electrically to said second electrode and extending from said second electrode to and fitting around and substantially encircling said stem alongside said first electrode between said seal region and said bulb portion.
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11. An arc discharge lamp comprising an envelope having a bulb portion and a pair of stems extending from opposite ends of said bulb portion and along a common axis, and a pair of electrodes respectively extending through said stems along said common axis and having ends thereof spaced apart within said bulb portion to define an arc discharge path, each of said electrodes respectively being parts of elongated electrode structures respectively hermetically sealed in said stems at regions thereof spaced from said bulb portion, wherein the improvement comprises a starting device of elongated electrically conductive material positioned externally of said envelope and connected electrically to one of said electrodes and extending to the vicinity of the other electrode and fitting around and sustantially encircling the stem at a location between its seal region and said bulb portion.
Specification