Low-pressure mercury vapor discharge lamp

A low-voltage technology for discharge lamps, applied in the field of low-pressure mercury vapor discharge lamps, can solve problems such as short life, achieve the effects of reduced electrode degradation, simplified rectifiers and battery packs, and long life

Inactive Publication Date: 2007-07-11
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

A disadvantage of the known low-pressure mercury vapor discharge lamps is that the discharge lamps have a relatively short lifetime in emergency mode

Method used

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

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Embodiment Construction

[0023] FIG. 1A shows very schematically a low-pressure mercury vapor discharge lamp comprising a glass discharge vessel with a tubular part, wherein the discharge vessel transmits the radiation generated in the discharge vessel 10 . The discharge vessel 10 seals in a gas-tight manner a discharge space 13 containing a filling of mercury and an inert gas mixture including, for example, argon. In a fluorescent discharge lamp, the side of the tubular portion 11 facing the discharge space 13 is coated with a luminescent layer (not shown in FIG. (Usually) A material (such as a phosphor) that emits light for visible light. Furthermore, the side of the tubular portion 11 facing the discharge space 13 is provided with one of more protective layers (not shown in FIG. 1A ).

[0024] The low-pressure mercury vapor discharge lamp is operable in a first and a second mode of operation. The first mode of operation is generally referred to as the "normal mode" of operation, while the second ...

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Abstract

A low-pressure mercury vapor discharge lamp is operable in a first mode of operation (''normal mode'') and a second mode of operation (''emergency operation''). The discharge lamp comprises a discharge vessel (10) enclosing a discharge space (13) provided with a filling of mercury and an inert gas. The discharge vessel comprises electrodes (5;6) for maintaining a discharge in the discharge space while the discharge lamp operates in the first mode of operation. According to the invention, at least one of the electrodes is operated on a DC or AC power supply for drawing a discharge current (D1;D2) over the electrode while the discharge lamp operates in the second mode of operation. Preferably, both electrodes operate on a DC or AC power supply, preferably a battery, while the discharge lamp operates in the second mode of operation. The low-pressure mercury vapor discharge lamps operated according to the invention have a relatively long life.

Description

technical field [0001] The invention relates to a low-pressure mercury vapor discharge lamp operable in a first and a second mode of operation. Background technique [0002] In mercury vapor discharge lamps, mercury constitutes the main component for the (efficient) generation of ultraviolet (UV) rays. A luminescent layer comprising luminescent material can be provided on the inner wall of the discharge vessel to convert UV into other wavelengths, for example into UV-B and UV-A for tanning purposes (solar panel lights), or into Visible radiant light for lighting purposes. Therefore, such discharge lamps are also called fluorescent lamps. Alternatively, the ultraviolet light generated can be used to make germicidal lamps (UV-C). The discharge vessel of a low-pressure mercury vapor discharge lamp is generally circular and includes elongated and compact embodiments. Typically, the tubular discharge vessel of a compact fluorescent lamp comprises a collection of relatively sh...

Claims

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Application Information

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IPC IPC(8): H01J61/72H01J61/92H01J61/00
CPCH01J61/72
Inventor L·R·C·沃曼斯
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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