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

A discharge lamp and electrode technology, which is applied in the manufacture of discharge tubes/lamps, electrode system manufacture, gas discharge lamp parts, etc. Cathode drop voltage, improved sputtering resistance, and long life effects

Inactive Publication Date: 2012-07-04
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

[0213]

[0214] In the aforementioned , after the plasma treatment, the vacuum chamber is first evacuated to 3×10 -4 Pa, and then filled with argon until it reaches 3700Pa.

[0215] Then, if Figure 41 As shown, an AC voltage of 10 Hz was applied at a peak-to-peak value of 600 V, and the cathode drop voltage of sample A after plasma treatment was measured, and it was 164 V when the Pd product was about 4.1 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 206V. Therefore, it can be seen that the cathode drop voltage of sample A after the plasma treatment is 20% lower than that of metal molybdenum.

Embodiment 2

[0217]

[0218] In , Sample B, which is a metal nickel substrate covered with a mayenite compound, was obtained in the same manner except that heat treatment was performed in a hydrogen atmosphere at a gas pressure of 0.1 MPa. The covered portion of Sample B was pale yellow in color and was not conductive in the tester. For the covered part of sample B, the electron density obtained by the measurement of the ESR device is less than 1.0×10 15 cm -3 . Further UV irradiation on the covered part, the H - The electron density is measured after the ions become electrons, and the H - Ion Density, Results H - The ion density is 7.3×10 18 cm -3 . In addition, it can be seen from X-ray diffraction that sample B is only 12CaO·7Al 2 o 3 structure.

[0219] Then, in the , the plasma processing was performed in the same manner except that the time of exposure to plasma was set to 5 seconds. According to X-ray diffraction, the coating of sample B after plasma treatment is only 1...

Embodiment 3

[0223]

[0224] The powder A2 was press-molded at a pressure of 2 MPa to produce a disk-shaped compact with a diameter of 1 cm and a thickness of 2 mm. Furthermore, this molded body was heated to 1350 degreeC in air|atmosphere, and the sintered body was obtained. The obtained sintered body was placed in an alumina container with metal aluminum powder spread on the bottom, and a lid made of alumina was placed on it. Put the covered aluminum oxide container at 10 -3 Heating to 1300°C in a vacuum below Pa to obtain a reduced sintered body. The resulting reduced sintered body was black. It pulverized by the same pulverization method as powder A2, and obtained the black powder with an average particle diameter of 5 micrometers. From the diffuse reflectance spectrum, the electron density of the black powder measured by Kubelka-Munck method is 1×10 21 cm -3 . In addition, it can be seen from X-ray diffraction that the powder is only 12CaO·7Al 2 o 3 structure.

[0225] In ,...

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PUM

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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 surface layer of the mayenite compound is plasma-treated.

Description

technical field [0001] The present invention relates to a discharge lamp, especially a cold cathode fluorescent lamp, and particularly relates to reducing the cathode drop voltage and saving power by having a plasma-treated mayenite compound on at least a part of an electrode or an appropriate part inside a cold cathode fluorescent lamp, In addition, an electrode for a discharge lamp, a method for manufacturing an electrode for a discharge lamp, and a discharge lamp are provided by improving sputtering resistance and thereby prolonging 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 44 shown. [0003] Figure 44 Among them, the glass tube 1 of the cold cathode fluorescent lamp 10 is coated with a phosphor 3 on ...

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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