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US 4,902,935 AGranted
Method and apparatus for evening out the temperature distribution of electrodeless lamp bulbs
AssigneeFusion Systems Corporation
InventorCharles H. Wood
Life of this patent
Estimating the term…
Abstract
An electrodeless lamp bulb is rotated about an axis which is at a designated angle to the predominant direction of the electrical field. This has the effect of evening out the temperature distribution about the bulb and reducing the formation of hot and cold spots.
Claims19
In an electrodeless lamp, a method of evening out the temperature distribution of the bulb wall, comprising the steps of,
- providing an electrodeless lamp including a bulb containing a gaseous fill which is disposed in only one electromagnetic field, which field has an electric field component which is predominantly in a first direction, and
- rotating the bulb about an axis which is at an angle of between about 30.degree. and about 70.degree. or between about 110.degree. and about 150.degree., with said first direction.
An electrodeless lamp comprising,
- a microwave cavity,
- a bulb containing a gaseous medium disposed in said cavity,
- means for generating microwave energy,
- means for coupling said microwave energy to said cavity in such manner that only one electric field is set up in said cavity, which electric field is predominantly in a first direction, and
- means for rotating said bulb about an axis which is at an angle of between about 30.degree. and about 70.degree. or between about 110.degree. and 150.degree., with said first direction.
2 more elements
Dependencies are inferred from the claim text.