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US 7,923,932 B2Granted
Short metal vapor ceramic lamp
AssigneeOsram Sylvania Inc.
InventorsWalter P. Lapatovich, James Avallon, John Selverian
Life of this patent
Estimating the term…
Abstract
A high intensity arc discharge lamp having a short metal seal plug running hotter than typical of capillary seals, enables a lamp with a metal fill to achieve a vapor pressure higher than the one set by the cold spot temperature typically of a capillary seal lamp. Corrosive fill materials, such as halogens are excluded. Zinc may be used to in starting the lamp.
Claims5
A high intensity discharge lamp comprising:
- an envelope substantially formed of a ceramic material;
- the envelope having a wall defining an enclosed volume with an interior surface;
- the wall formed with at least one passage extending from the interior surface of the enclosed volume to an exterior side of the wall;
- at least a first electrically conductive electrode extending into the enclosed volume and electrically coupled through a seal plug having a metal seal portion that is hermetically sealed in the passage to close the passage without the use of a frit;
- a chemical fill located in the enclosed volume, the chemical fill consisting of sodium metal, thallium metal, indium metal and mercury metal;
- and
- an inert gas in the enclosed envelope, the inert gas having a fill pressure greater than five kilopascals at 20 degrees Celsius.
4 more elements
Dependencies are inferred from the claim text.