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Low-pressure mercury-vapor discharge lamp and amalgam

A technology of mercury vapor and discharge lamps, which is applied in the direction of low-pressure discharge lamps and parts of gas discharge lamps, and can solve the problems of radiation output reduction and other issues

Inactive Publication Date: 2002-08-21
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this lamp has the disadvantage that the mercury vapor pressure is equal to the saturated vapor pressure corresponding to the coldest point temperature of the discharge vessel
Since the saturated vapor pressure increases exponentially with temperature, temperature changes that occur, for example, in poorly ventilated luminaires or when lamps are subjected to high loads lead to a reduction in radiant output

Method used

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  • Low-pressure mercury-vapor discharge lamp and amalgam
  • Low-pressure mercury-vapor discharge lamp and amalgam
  • Low-pressure mercury-vapor discharge lamp and amalgam

Examples

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Embodiment Construction

[0032]Figure 1A shows a compact fluorescent lamp comprising a low pressure mercury vapor discharge lamp. The low-pressure mercury vapor discharge lamp is provided with a radiation-transmissive discharge vessel 10 which is closed in a gas-tight manner with a diameter of about 10 cm. 3 The volume of the discharge space 11 . The discharge vessel 10 is a glass tube with an at least substantially circular cross-section and an (effective) inner diameter of about 10 mm. The glass tube is bent into a so-called hook shape and, in this example, comprises a number of straight tube sections, two straight tube sections 31 , 33 are shown in FIG. 1A . The glass tube also includes a number of arcs, two arcs 32, 34 are shown in Figure 1A. The discharge vessel 10 is provided with a luminescent layer 17 on the inner wall 12 . In another embodiment, the light emitting layer is omitted. The discharge vessel 10 is supported by a housing 70 which also supports a lamp cap 71 provided with electri...

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Abstract

A low-pressure mercury-vapor discharge lamp is provided with a discharge vessel (10). The discharge vessel (10) encloses a discharge space (11) provided with a filling of mercury and an inert gas in a gastight manner. The discharge vessel (10) is provided with an amalgam which communicates with the discharge space (11). The discharge lamp comprises means for maintaining an electric discharge in the discharge vessel (10). The discharge lamp is characterized in that the amalgam comprises a bismuth-lead amalgam having a lead content in the range from 35 <= Pb <= 60 at. %, a bismuth content in the range from 40 <= Bi <= 65 at. %, and a mercury content in the range from 0.05 <= Hg <= 1 at. %. Preferably, the amalgam additionally comprises gold with a gold content in the range from 0.1 <= Au <= 20 at. %. Preferably, the gold content is in the range from 8 <= Au <= 12 at. %. The lamp according to the invention exhibits a comparatively high initial radiation output and a short run-up time in combination with a relatively high radiation output at nominal lamp operation, which is achieved in a comparatively large temperature interval.

Description

technical field [0001] The invention relates to a low-pressure mercury vapor discharge lamp comprising a discharge vessel, [0002] The discharge vessel is hermetically sealed providing a discharge space filled with mercury and an inert gas, [0003] The discharge vessel contains amalgam in communication with the discharge space, [0004] And the low-pressure mercury vapor discharge lamp comprises means for maintaining the discharge in the discharge space. [0005] The invention also relates to the amalgam used in the low-pressure mercury vapor discharge lamp. Background technique [0006] In this low-pressure mercury vapor discharge lamp, mercury is the main part for (effectively) generating ultraviolet (UV) light. The inner walls of the discharge vessel may be covered with a luminescent layer comprising UV-B and UV-A for conversion of UV into other wavelengths such as UV-B and UV-A for tanning purposes (sight lamps) or into visible light for gen...

Claims

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Application Information

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IPC IPC(8): H01J61/24H01J61/28H01J61/72
CPCH01J61/28H01J61/72H01J61/20
Inventor M·H·R·兰克霍尔斯特W·C·克伊尔L·C·I·卡尔登霍文
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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