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Cold cathode fluorescent lamp

A technology for cold cathode fluorescent lamps and phosphor layers, which is applied to discharge lamps, gas discharge lamps, parts of gas discharge lamps, etc., can solve the problem of increasing the number of production steps, complicated adjustment of production steps, and not considering the reduction of sputtering resistance. and other problems, to achieve the effect of excellent long life and excellent sputtering resistance

Inactive Publication Date: 2010-10-06
NEC LIGHTING +1
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  • Application Information

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Problems solved by technology

[0005] However, the problem with the discharge lamp described in Patent Document 1 is that the structure of the electrode is very complicated, and therefore, the number of manufacturing steps is increased, and the adjustment of the manufacturing steps is complicated, reducing the manufacturing efficiency.
Also, in the cold cathode discharge lamp described in Patent Document 2, no consideration is given to suppressing the reduction in sputtering resistance due to heat generated by a large current making the tube current larger than 10 mA, and in the lead wires for supplying power ( Such as Kovar wire) is connected to the electrode, when the electrode is placed and the transparent tube is sealed by a plug or the like, the effect of suppressing the deterioration of the Kovar wire and the oxidation of the electrode cannot be obtained

Method used

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Examples

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example 1

[0053] The starting material (with 0.5% by mass of cerium metal added to nickel) was melted at a temperature equal to or higher than the melting point of nickel. The ingot material was cast in a mold and cooled to room temperature. After that, hot rolling, cold rolling, wire drawing, etc. are repeated to produce a wire material having a diameter of about 0.2 mm. The wire material was subjected to forging processing to produce a cup-shaped electrode having an outer diameter of 1.7 mm and a length of 5 mm. A Kovar wire with a diameter of 0.8 mm was welded to the bottom surface portion of the obtained electrode to be integrated.

[0054] The average diameter of crystal particles of nickel of the electrode was measured by a comparison method. The average diameter of nickel crystal particles was 22 μm.

[0055] A phosphor material with a thickness of about 18 μm was coated onto the inner wall surface of a glass tube having an inner diameter of 2.0 mm. Electrodes fused with Kova...

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Abstract

Disclosed is a cold cathode fluorescent lamp which has excellent sputtering resistance and long life even when a high tube current is applied thereto. This cold cathode fluorescent lamp can be easily produced at low cost. Specifically disclosed is a cold cathode fluorescent lamp comprising a transparent tube having a phosphor layer provided on the inner wall surface thereof and containing a rare gas and mercury inside while being hermetically sealed with a sealing member at both ends, electrodes arranged inside the transparent tube near the ends of the tube, and lead wires connected to the electrodes and penetrating through the sealing members. This cold cathode fluorescent lamp is characterized in that the electrodes mainly contain nickel, while further containing cerium metal or a cerium oxide.

Description

technical field [0001] The present invention relates to a cold cathode fluorescent lamp, and more particularly, to a cold cathode fluorescent lamp in which a longer lifetime can be expected by improving sputtering resistance of electrodes even when a high tube current is applied. Background technique [0002] Because cold cathode fluorescent lamps are excellent in high brightness, high color rendering, long life, low power consumption, etc., cold cathode fluorescent lamps are frequently used for backlights applied to liquid crystal displays such as for televisions or computers, for reading For light sources such as facsimiles, light sources for erasers such as copiers, or various displays, etc. In this type of cold cathode fluorescent lamp, voltage is applied to electrodes provided at both ends of a transparent glass tube (the inside of which is hermetically sealed with rare gas and mercury) or the like to make the rare The gas is ionized, and the ionized noble gas is allow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/067
CPCH01J61/09H01J61/0675
Inventor 杉村俊和畑均泽山忍河西功高桥辰也
Owner NEC LIGHTING
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