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Optimal silicon dioxide protection layer thickness for silver lamp reflector

A technology of protective layer and reflective layer, which is applied in the field of reflective coating and its preparation, can solve the problems of silver film property damage, poor chemical resistance, silver film oxidation, etc., and achieve excellent LPW effect

Inactive Publication Date: 2005-02-16
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the temperatures used in the sealing process, the silver film is easily oxidized, which destroys the optical properties of the silver film
Therefore, unprotected silver films are not suitable for lamp manufacture by this process
Moreover, silver films exhibit poor chemical resistance to sulfide rust, whereby the properties of unprotected silver films exposed to the atmosphere are thus compromised

Method used

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  • Optimal silicon dioxide protection layer thickness for silver lamp reflector
  • Optimal silicon dioxide protection layer thickness for silver lamp reflector
  • Optimal silicon dioxide protection layer thickness for silver lamp reflector

Examples

Experimental program
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Embodiment approach

[0048] where P CCTn is the thickness at CCT peak n, and where n is an integer from 0 to about 10 (eg, n=0, 1, 2, 3, etc.). According to another embodiment, n is at least 1. According to yet another embodiment, n is less than about 5.

[0049] According to another embodiment, the protective layer thickness t is at P CCTn within the range of ±200 Angstroms. According to yet another embodiment, the thickness of the protective layer is at P CCTn within the range of ±100 angstroms (see attached figure 2 The range A between the middle dashed lines corresponds to a silicon oxide thickness of 1100-1300 Angstroms). If % reflectance is considered more important, then a reflectance peak (P Rn ) may be more suitable, for example, the thickness may be at P Rnwithin the range of ±400 Angstroms. In a specific embodiment, the thickness is P Rn ±200 Angstroms, and in another specific embodiment, the thickness of layer 18 is P Rn ±100 Angstroms. Since the periodicity depends on the ...

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Abstract

A reflector lamp has a generally parabolic shaped housing (12) with an interior surface coated with a layer (16) of silver having a protective layer (18) of a stable protective material, such as silica, disposed thereon. The thickness of the protective layer is selected such that at least one of the following relationships is satisfied: a color correction temperature of the lamp is no less than about 60K below that of the light source, and a % reflectance of the reflective interior surface is no less than about 3% below that of an equivalent reflective interior surface without the protective layer.

Description

technical field [0001] The invention relates to lamp technology. More specifically, the present invention relates to a reflective coating for use in a reflector lamp in which the light source is contained in a lampshade having a transparent part and a reflective part, the reflective part being positioned to reflect a substantial portion of the generated light out through the transparent portion. Background technique [0002] Reflector lights are widely used in spotlights, headlights, and other similar lighting equipment. Typical examples of reflector lamps include the PAR 38 and PAR 64 lamps produced by General Electric. PAR is the recognized abbreviation for "parabolic coated aluminum reflector". Other commercially available reflector lights are described in US Pat. [0003] A more recent area of ​​focus in reflector design has shifted to improving energy efficiency. In industry, energy efficiency is usually measured by reference to lumens produced by a lamp per watt o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V7/22
CPCF21V7/22F21V7/24F21V7/28
Inventor 雷贾辛·伊斯雷尔阿什法奎尔·I·乔杜里赵天吉
Owner GENERAL ELECTRIC CO