Industry Patents
Patent: 7352118
Optimized Ultraviolet Reflecting Multi-Layer Coating for Energy Efficient Lamps
(Click image for PDF of full patent)
| Patent Number: |
7352118 |
| Title: |
Optimized Ultraviolet Reflecting Multi-Layer Coating for Energy Efficient Lamps |
| Abstract: |
A metal halide lamp (10) includes a light-transmissive envelope (12) which
encloses a metal halide pool (30) for generating a discharge when spaced
apart electrodes (20, 22) within the envelope are supplied with an
electric current. A multi-layer coating (40) is deposited on a surface
(42) of the envelope. The coating includes several layers of at least two
materials of different refractive index, which, in combination, reflect
radiation in the UV region of the electromagnetic spectrum. Rather than
optimizing the coating for a normal (i.e., 0.degree.) angle of incidence
on the coating, the multi-layer coating is optimized at an angle which is
selected to be within 10.degree. of the mean angle (.alpha.) of incidence
of the UV radiation on the arctube surface, thereby increasing the amount
of UV radiation which is returned to the metal halide pool. The coating
is preferably optimized for high reflectivity in the UV-region of the
spectrum and high transmission in the visible region of the spectrum to
maximize useful light output while reflecting UV light back to the metal
halide pool for improved heating of the pool.
|
| Country of Issue: |
US |
| First Named Inventor: |
Chowdhury, israel, Allen |
| Assignee: |
GEC |
| Continuation or Divisional of: |
|
| International Classification: |
H01J 61/35 |
| US Classification: |
313/112 |
| Issue Date: |
04-01-2008 |
| Filing Date: |
12-10-2003 |
| Application : |
10/732885 |
| Notes: |
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| Link to Patent at freepatentsonline.com: |
7352118 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
7352118 at Google Patents |
1. The Google Patents and World Patent Family links will likely not work until a few weeks
after the patent has issued - they take a while to get new patents in their systems.
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