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Electrode for discharge lamp, process for production of electrode for discharge lamp, and discharge lamp

A technology for discharge lamps and electrodes, which is applied in the manufacture of discharge tubes/lamps, electrode system manufacturing, and components of gas discharge lamps. Cathode drop voltage, improved sputtering resistance, and power saving effects

Inactive Publication Date: 2012-05-30
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In Patent Document 1, an alloy composed of iridium and rhodium (Rh) is used to reduce the cathode drop voltage, but the cathode drop voltage is reduced by at most 15% compared with the cathode drop voltage of molybdenum.
[0010] In addition, in cold cathode fluorescent lamps, there is a problem that ions such as argon generated in the glow discharge collide with the electrodes, and the cup-shaped electrodes are worn out by sputtering.
If the cup-shaped electrode is worn out, a sufficient amount of electrons cannot be emitted, resulting in a decrease in luminance
Therefore, there is a problem that the life of the electrode is shortened, and the life of the cold cathode fluorescent lamp is also shortened.
[0011] In order to solve such a problem, it has been proposed to coat the surface of the cup-shaped electrode with a material that is resistant to sputtering, but there is a problem that the secondary electron emission performance of the cup-shaped electrode deteriorates.

Method used

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  • Electrode for discharge lamp, process for production of electrode for discharge lamp, and discharge lamp
  • Electrode for discharge lamp, process for production of electrode for discharge lamp, and discharge lamp
  • Electrode for discharge lamp, process for production of electrode for discharge lamp, and discharge lamp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0203]

[0204] Set sample A to figure 2 The open circuit battery discharge measurement device 30 is shown in the vacuum chamber 31 . Set metal molybdenum as the counter electrode. The distance between the sample A and the counter electrode was 1.45 mm. First the vacuum chamber 31 is evacuated to 3×10 -4 Pa, and then filled with argon until it reaches 4400Pa.

[0205] Then, if Figure 45As shown, a 10Hz AC voltage was applied with a peak-to-peak value of 600V for glow discharge. The cathode drop voltage of Sample A was measured and found to be 152 V when the Pd product was about 4.8 Torr·cm. Here, P is the air pressure in the vacuum chamber, and d is the distance between the cathode and the anode. In contrast, the cathode drop voltage of metal molybdenum is 212V. Therefore, it can be seen that the cathode drop voltage of sample A is 28% lower than that of metal molybdenum.

Embodiment 2

[0207]

[0208] In the aforementioned , the sample B was obtained in the same manner except that the heat treatment temperature was set to 1340°C. The covered portion of sample B was green. According to X-ray diffraction, the covering part is only 12CaO·7Al 2 o 3 The structure is a mayenite compound. In addition, the electron density of the mayenite compound in the covering part obtained by the Kubelka-Munck method from the diffuse reflectance spectrum is 5.8×10 19 cm -3 . In addition, the surface shape when observed with a SEM at a magnification of 6000 times has a three-dimensional concave-convex structure with a domain diameter of 0.1 to 5 μm.

[0209] Then, set sample B to figure 2 The open circuit battery discharge measurement device 30 is shown in the vacuum chamber 31 . Set metal molybdenum as the counter electrode. The distance between the sample B and the counter electrode was 1.13 mm. Evacuate the vacuum chamber to 3×10 -4 Pa, and then filled with argon ...

Embodiment 3

[0212]

[0213] In the aforementioned , sample C was obtained in the same manner except that the holding time at 1300° C. was set to 2 hours. The covered portion of sample C was green. According to X-ray diffraction, the covering part is only 12CaO·7Al 2 o 3 The structure is a mayenite compound. In addition, the electron density of the mayenite compound in the covering part obtained by the Kubelka-Munck method from the diffuse reflectance spectrum is 3.2×10 19 cm -3 . In addition, the surface shape when observed with a SEM at a magnification of 6000 times has a three-dimensional concave-convex structure with a domain diameter of 0.2 to 6 μm.

[0214] Then, set sample C to figure 2 The open circuit battery discharge measurement device 30 is shown in the vacuum chamber 31 . Set metal molybdenum as the counter electrode. The distance between sample C and the counter electrode was 1.45 mm. Evacuate the vacuum chamber to 3×10 -4 Pa, and then filled with argon until it ...

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Abstract

An electrode for a discharge lamp, comprising an electrode capable of releasing a secondary electron and a mayenite compound provided on at least a part of the electrode, wherein the mayenite compound is burned in a vacuum atmosphere having an oxygen partial pressure of 10-3 Pa or less, an inert gas atmosphere having an oxygen partial pressure of 10-3 Pa or less, or a reductive atmosphere having an oxygen partial pressure of 10-3 Pa or less.

Description

technical field [0001] The present invention relates to a discharge lamp, especially a cold cathode fluorescent lamp, and particularly relates to a mayenite compound whose surface is heat-treated in a vacuum, an inert gas atmosphere or a reducing atmosphere by having at least a part of an electrode or a suitable part inside a cold cathode fluorescent lamp Disclosed are an electrode for a discharge lamp, a manufacturing method of an electrode for a discharge lamp, and a discharge lamp which can reduce cathode drop voltage and save electricity, and improve sputtering resistance and thus prolong life. Background technique [0002] A liquid crystal display device (LCD) used for a flat panel display or a computer incorporates a backlight using a cold cathode fluorescent lamp as a light source for illuminating the LCD. The structure diagram of this existing cold cathode fluorescent lamp is as follows Figure 50 shown. [0003] Figure 50 Among them, the glass tube 1 of the cold c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/06H01J9/02H01J61/067
CPCH01J9/022H01J61/0677H01J61/78H01J61/06H01J9/02
Inventor 伊藤和弘渡边晓宫川直通黑岩裕伊藤节郎
Owner ASAHI GLASS CO LTD
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