Cold-cathode fluorescent lamp, electrode and electrode unit

Abstract

The cold cathode fluorescent lamp has a glass tube in which at least rare gas and mercury gas are sealed into the tightly sealed internal space, and in which a phosphor layer is formed on the inner wall face, a pair of cylindrical electrodes which are arranged in the internal space, in which the base part is formed at one end, and an opening part is formed at the other end, and which is arranged so that the opening parts may be opposed to each other, and a lead wire of which one end is joined to the base part, and of which the other end is drawn out to the outside of the glass tube. The cylindrical electrode is made to have nickel or a nickel alloy as the base material, and formed by a material to which metal having deoxygenation action is added.

Description

technical field [0001] The present invention relates to a cold cathode fluorescent lamp and an electrode and an electrode unit constituting a part of the cold cathode fluorescent lamp, in particular to an electrode structure of the cold cathode fluorescent lamp. Background technique [0002] Cold cathode fluorescent lamps are often used in backlights of liquid crystal panels and the like in recent years due to their characteristics such as easy miniaturization, low power consumption, and long life. A cold-cathode fluorescent lamp generally has a structure in which a pair of electrodes are arranged facing each other inside a glass tube filled with a rare gas such as argon and mercury vapor, and lead wires are connected to each electrode. The electrodes are shaped like cups, and are arranged such that openings of the cups face each other. When a voltage is applied between the electrodes through a wire, electrons are released from one electrode and collide with mercury atoms t...

AI Technical Summary

Problems solved by technology

After the surface of the electrode is oxidized, the sputtering resistance will be reduced, so the rare sputtering resistance cannot be exerted

Moreover, since molybdenum or niobium is difficult to reduce once it is oxidized, it is difficult to reduce it in an atmosphere such as hydrogen in the subsequent process.

[0006] Second, since molybdenum or niobium are metals with high melting points, sufficient bonding strength cannot be obtained without very high-temperature heating when soldering the wire to the electrode

However, if the copper flows out, there will be a void in the outer tube made of Kovar that is not filled with copper, resulting in a decrease in heat dissipation performance.

[0007] Third, the price of molybdenum or niobium is generally higher, and electrodes based on these metals are often more expensive than electrodes made of nickel

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