 Systems, devices and methods for lighting |
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| Fold-up navigation light |
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Protected coating for energy efficient lamp
| Details |
Inventors: Zhao, Tianji; Israel, Rajasingh Schwartz; Dynys, Frederick Walter; Parham, Thomas Gene;
Assignee: General Electric Company (Schenectady, NY)
Primary Examiner: O'Shea; Sandra
Assistant Examiner: Ton; Anabel
Attorney, Agent or Firm: Fay, Sharpe, Fagan, Minnich & McKee, LLP
A reflector lamp has a generally parabolic shaped housing (12) with an interior surface coated with a layer (14) of silver having a protective layer (16) of a stable protective oxide, such as silica, disposed thereon. An intermediate layer (18), such as a layer of elemental silicon, protects the silver layer during deposition of the silica layer and is completely or substantially consumed during formation of the silica layer. The lamp includes a light source (48) having a longitudinal axis (x) disposed on the parabolic reflector axis and preferably disposed outward of the parabolic focus (F). During lamp fabrication, the protective coating is preferably annealed to improve reflectance. The preferred lamp will have a lumens per watt greater than 14. |
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DETAILED DESCRIPTION In an exemplary embodiment of the present invention, a method of forming a lamp is provided.
The method includes providing a reflective interior surface, consisting of the steps of providing a layer of silver, providing a protective layer which protects the silver layer against oxidation and sulfide formation, and providing a buffer layer intermediate between the layer of silver and the protective layer which protects the silver layer from oxidation during the step of providing the protective layer.
The method further includes forming the lamp from the interior surface, a light source and a lens.
In another exemplary embodiment of the present invention, a lamp is provided.
The lamp includes a light source within a housing having a reflective interior surface consisting of a protective layer disposed over a layer of silver.
The lamp is produced by a method which includes annealing the reflective surface to increase its reflectivity.
In another exemplary embodiment of the present invention, a lamp is provided.
The lamp includes a housing, a light source within the housing.
A reflective interior surface includes a silver layer, a protective layer disposed over the silver layer.
A lens closes the housing.
In another exemplary embodiment of the present invention, a lamp is provided.
The lamp includes a light source within a generally parabolic housing having a reflective interior surface comprising a protective layer covering a silver layer.
The light source has a longitudinal axis disposed substantially on the axis of said parabolic housing.
One advantage of this invention is the provision of a new and improved reflector lamp having superior LPW.
Another advantage of the present invention is the provision of a protective coating on a silver reflector.
Another advantage of the present invention is the provision a stoichiometric silicon dioxide coating with high reflectivity.
Additional advantages of the invention will be set forth in part in the description, which follows and in part will be obvious from the description, or may be learned by practice of the invention
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Light Fixtures 
