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Electric lamp with light-absorbing coating, precursor suspension for such a coating and method of making such a lamp

A technology of suspensions and electric lamps, which is applied to the parts, coatings, shells/shells of luminous bodies, etc. of gas discharge lamps, and can solve problems such as short shelf life, environmental hazards, and proportional aggravation

Inactive Publication Date: 2009-09-16
LUMILEDS HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of the known suspension is that it has a relatively short shelf life of about 3 days and that when fired onto the lamp vessel and converted into a light-absorbing coating, this light-absorbing coating may be removed from the lamp relatively easily. knock down on container
Another disadvantage is that this coating contains environmentally harmful substances: cobalt oxide in the pigment and lead oxide in the frit
This coating also has the disadvantage that it transmits relatively much light
This disadvantage increases proportionally with higher brightness of the light source, as in the case of high-pressure discharge lamps

Method used

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  • Electric lamp with light-absorbing coating, precursor suspension for such a coating and method of making such a lamp
  • Electric lamp with light-absorbing coating, precursor suspension for such a coating and method of making such a lamp

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Embodiment Construction

[0012] exist figure 1 In this case, the high-pressure discharge lamp has a quartz glass lamp vessel 10 , which is sealed in a gas-tight manner by a seal 2 , which lamp vessel houses the electrical components. The electrical element comprises electrodes 3, 4 embedded in a quartz glass envelope 1 containing an ionizable filling. The filling comprises, for example, mercury, a mixture of metal halides such as sodium iodide and scandium iodide, and a noble gas such as xenon, and the filling pressure is several bars. The current conductors 8 , 23 ; 8 , 25 comprise molybdenum foils embedded in the seal 2 of the lamp vessel, the current conductors 8 , 23 ; 8 , 25 are connected to the electrodes and lead from the lamp vessel to the outside. The lamp has a base 20 equipped with contacts 21,22.

[0013] The lamp vessel is partially covered with a light-absorbing coating 11, 12 comprising iron (mainly in metallic form, partly in oxidized form), silicon dioxide and silicon powder. The c...

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Abstract

The present invention describes an electric lamp. The electric lamp has a quartz glass lamp vessel (10) in which an electric element (3,4) is accommodated. The lamp vessel locally has a light-absorbing, non-reflective coating (11,12). The coating mainly consists of iron, iron oxide, silicon, and silicon dioxide, the ratio of the weight percentages of iron compounds and silicon compounds being in the range of 0.17 <= iron compounds / silicon compounds <= 12, and the ratio of the weight percentages of silicon and silicon dioxide being in the range of 0.5 <= silicon / silicon dioxide <= 50.

Description

technical field [0001] The invention relates to an electric lamp as defined in the preamble of claim 1 . The invention also relates to a suspension for said electric lamp and a method of manufacturing such a lamp. Background technique [0002] An electric halogen incandescent lamp of this type is known from DE 3827451. In addition to iron oxide, known light-absorbing coatings also include titanium oxide, manganese oxide and magnetite, FeO 4 , and ethyl silicate as a binder before firing onto the glass of the lamp vessel. Known coatings are obtained from suspensions which also include sodium metaphosphate, ethylene glycol, ethylene glycol monobutyl ether and ethanol. This suspension has a relatively complex composition. The disadvantage of the known suspension is that it has a relatively short shelf life of about 3 days and that when fired onto the lamp vessel and converted into a light-absorbing coating, this light-absorbing coating may be removed from the lamp relativel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/35C03C17/30
CPCC09D5/00H01J61/35C03C17/009C03C17/004H01K1/32C03C2217/217C03C2217/213
Inventor H·J·施洛默
Owner LUMILEDS HLDG BV
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