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US 5,856,726 AGranted
Electric lamp with a threaded electrode
AssigneeOsram Sylvania Inc.
InventorsJean M. Evans, Harold L. Rothwell, Jr.
Life of this patent
Estimating the term…
Abstract
An electric discharge lamp with an internally threaded electrode is disclosed. The lamp includes an envelope, a support rod, and an electrode can with an interior surface having a multiplicity of peaks, points, of sharp edge regions. These equal height prominences evenly extended around the inside wall of the electrode can. The threaded electrode yields a highly emissive electrode with no emissive material to be eroded.
Claims24
An electric lamp comprising:
- a) a light transmissive envelope defining an enclosed volume,
- b) a first input lead sealed to and extending through the envelope with an interior end of the first lead located in the enclosed volume,
- c) an electrode can attached to the interior end of the lead, the electrode can having a wall with an interior side defining an interior can cavity, and defining an opening of the can cavity at an end of the can away from the lead, the interior side further having a multiplicity of radially inward extending points, forming a radially constant distribution of points around the defined opening;
- d) a second input lead sealed to and extending through the envelope with an interior end of the second lead located in the enclosed volume,
- e) a second electrode coupled to the interior end of the second lead, and
- f) a fill material enclosed in the enclosed volume excitable to light emission by the application of sufficient electric voltage and current between the first electrode and the second electrode.
3 more elements
An electric lamp comprising:
- a) a light transmissive envelope defining an enclosed volume,
- b) a first input lead sealed to and extending through the envelope with an interior end of the first lead located in the enclosed volume,
- c) an electrode can attached to the interior end of the lead, the electrode can having a wall with an interior side defining an interior can cavity, and defining an opening of the can cavity at an end of the can away from the lead, the interior side further having at least one edge extended radially inward, forming an interior edge around at least a portion of the defined opening;
- d) a second input lead sealed to and extending through the envelope with an interior end of the second lead located in the enclosed volume,
- e) a second electrode coupled to the interior end of the second lead, and
- f) a fill material enclosed in the enclosed volume excitable to light emission by the application of sufficient electric voltage and current between the first electrode and the second electrode.
3 more elements
A threaded electrode comprising:
- a) an electrically conductive lead having an axial elongation terminating at a lead end,
- b) an electrically conductive can, mechanically supported by, and electrically coupled to the lead, the can having a support end, an interior can wall defining an interior volume, an open can end exposing the interior volume, an axis extending from the support end through the interior volume to the open end, the can positioned about and sealed to the lead end to substantially enclose the lead end in the interior volume, the interior can wall further having at least one edge extended radially inward, forming an interior edge around at least a portion of the defined opening.
Dependencies are inferred from the claim text.