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High light efficiency external electrode porcelain tube cathode fluorescent lamp and making method thereof

A fluorescent lamp and external electrode technology, applied in the manufacture of discharge tubes/lamps, cold cathodes, electrode systems, etc., to achieve the effect of low working voltage, prolonging lamp life, and reducing working voltage

Inactive Publication Date: 2009-02-11
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Existing external electrode fluorescent lamps (EEFL) such as figure 1 , it has a larger diameter, and the voltage required for gas discharge is also relatively high. It is now being used in LCD TVs as a backlight source. It can be expected that the application of these cold cathode fluorescent lamps will develop rapidly. The problems faced are also to reduce the operating voltage and improve luminous efficiency.

Method used

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  • High light efficiency external electrode porcelain tube cathode fluorescent lamp and making method thereof
  • High light efficiency external electrode porcelain tube cathode fluorescent lamp and making method thereof
  • High light efficiency external electrode porcelain tube cathode fluorescent lamp and making method thereof

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Embodiment Construction

[0025] The fluorescent lamp of the present invention is based on a slender fluorescent lamp glass tube 2 with openings at both ends. The inner surface of the fluorescent lamp glass tube 2 is coated with phosphor powder 1, and ceramic tubes 5 are placed inside the two ends of the fluorescent lamp glass tube 2. The inside of the tube 2 is filled with discharge gas 3, and a pair of metal discharge electrode films 4 are arranged on the outer surfaces of both ends of the glass tube 2 of the fluorescent lamp.

[0026] The ceramic tubes 5 placed at both ends of the fluorescent lamp glass tube 2 are made of alumina or magnesium aluminate with a high secondary electron emission coefficient. The discharge gas 3 filled in the fluorescent lamp tube 2 is a discharge gas composed of inert gas helium, or neon, or argon, or xenon, or their mixed gas, and mercury metal. A pair of metal discharge electrode films 4 prepared on the outer surfaces of the two ends of the fluorescent lamp glass tube...

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Abstract

The high-efficiency low-voltage external electrode fluorescent lamp (EEFL) for LCD backlight source and illumination comprises: using a slim two-end-opening fluorescent glass tube (2) as main body with fluorescent powder (1) on inner surface and a ceramic tube (5) on inner surface of ends; filling discharge gas (3) in tube (2), setting a couple of metal discharge electrode membranes (4) on outer surface of tube (2) end. Wherein, when manufacturing the lamp, clearing and drying the EEFL, costing fluorescent powder 1 on inner surface, arranging ceramic tube such as alumina ceramic tube 5 on two ends of tube 2; then, sintering and sealing one opening of the tube.

Description

technical field [0001] The invention relates to an external electrode fluorescent lamp (EEFL) used in occasions such as liquid crystal display backlight source, electrical lighting and daily lighting, in particular to an external electrode fluorescent lamp with low working voltage and high luminous efficiency. Background technique [0002] Cold cathode fluorescent lamp is a new type of light source that does not require cathode filament heating and can be made very thin (generally below 10mm, such as 1.8mm). There are two types of cold cathode fluorescent lamps, namely internal electrode fluorescent lamps (CCFL) and external electrode Fluorescent lamps (EEFLs). The electrons and ions required for gas discharge in cold cathode fluorescent lamps are composed of gas ionization process and secondary emission of electrodes, which is different from the gas discharge formed by thermionic emission of hot cathode fluorescent lamps (HCFL). Internal electrode fluorescent lamps have hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J65/00H01J61/36H01J61/16H01J9/00H01J9/40
Inventor 张晓兵英达正
Owner SOUTHEAST UNIV
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