TW200425211A - Cold cathode tube - Google Patents

Abstract

A cold cathode tube is provided for further increasing its lifetime. The cold cathode comprises a sealing wire 3 having a multiplayer structure. The sealing wire 3 is connected to an inner lead 4 and an electrode 5, and airtightly penetrates the interior and exterior of a tube end of a glass tube 1. The outer layer 31 of the sealing wire 3 is made of covar, and the inner layer 32 of the sealing wire is made of a heat conducting wire, such as cooper, berylliun or aluminum, etc., having a thermal conductivity higher than that of the outer layer 31. In this way, heat generated from the electrode 5 can be effectively transported to the external outer lead 6 and the wire 8.

Description

200425211 V. Description of the invention (1) The technical field to which the invention belongs "Long Ming is about a cold-cathode tube that is used as a light source for liquid crystal display capture and so on. 1 The previous technology of the person who puts the temple is generally used as a liquid crystal In the vicinity of the cold cathode tube of the backlight of the display device, there is a gas-tight tube inside and outside of the tube end of the glass tube. 1: The inner lead and electrode portion placed on the inside end of the tube, and: Bulletin, pages 4 ~ 5, long life of figure to 30, 000 hours. For example, Dalang '"Long life high efficiency cold cathode fluorescent lamp, monthly _ _ = August issue, pages 82 ~ 84 . "Monthly Bulletin, 1999

In the cold-cathode tube described above, in order to achieve a longer life, for example, a phosphor protective film is added, and the glass composition is changed in consideration of changes in electricity. However, ⑤, any kind = investment and development investment are needed, so in reality, it is not documented. 〇 Industry + Effective Solution Summary of the Invention In view of the above-mentioned conventional problems, the electrode of the present invention can more easily realize long life. In order to achieve the above-mentioned and other objectives, the present invention proposes that the cold cathode tube includes: glass *, and the inner surface thereof has a hair: $ 极 官. The material is set to pass through the tube end of the glass tube hermetically: m. The inner layer of the sealed wire contains heat-conducting wires. BU 200425211 V. Description of the invention (2) The conductivity is higher than the outer layer of the sealed wire; inner wires and electrodes The outer part is located inside the glass official and connected to one end of the sealed wire; and the outer lead is located outside the glass official and connected to the other end of the sealed wire, and the outer lead is further connected to an external wire. The cold cathode tube with the above structure is constructed using a simple structure in which the sealed wire is multi-layered and a heat conductive wire layer is provided. The tritium generated by the electrode portion is transmitted from the inner lead to the heat conductive wire of the sealed wire, and is more efficiently transmitted. To the outer conductor; from the outer conductor to the wire connected to the outer conductor. Therefore, it is possible to sufficiently secure the amount of heat absorbed and emitted to the electrode portion, and to prevent the electrode portion from overheating. Thereby, a longer life of the cold cathode tube can be achieved. In the cold-cathode tube described above, the outer layer of the sealed wire is preferably made of a metal material having the same thermal expansion rate as the sealed portion of the glass tube. In this case, even if thermal expansion or contraction occurs, H ^ does not occur with the sealing portion. Therefore, it is possible to prevent the sealing ability from being damaged and unable to be lit. In addition, in the cold cathode, the diameter of the sealing wire is preferably " or more. In this case, the straightness of the heat conduction line can be ensured correspondingly. In addition, the entire sealed wire also contributes more to the improvement of thermal conductivity. This can more reliably prevent overheating of the electrode portion. = To make the above-mentioned objects, features, and advantages of the present invention more obvious and easy, a preferred embodiment will be given below, and will be described in detail in conjunction with the accompanying drawings. Embodiment 1 FIG. 1 is a cold cathode tube according to an embodiment of the present invention. Section view. This cold cathode 13013pif.ptd Page 6 200425211 V. Description of the invention (3) 'The tube system is a direct-type backlight or a side-type backlight used in a liquid crystal display device, a X-ray film viewer, and a kanban backlight device , A variety of devices such as a light box (1 i ght i ng box) for viewing negative photos. & In Fig. 1, the cold cathode tube includes a glass breaking tube 1 having a light emitting layer 2 on the inside, a sealing wire 3 penetrating the inside and outside of the tube end 1a of the glass tube 1, inside the glass tube ^ and connected to the sealing wire 3 inner conductor (inner lea (〇4 \ electrode section 5), and outer lead 6 outside the glass tube 1 and connected to the other end of the sealed wire 3. The outer side of the aforementioned sealed wire 3 is The glass bead 7 is covered to hermetically seal the glass tube 1 〇 Any one of the outer conductor 6, the sealing wire 3, and the inner conductor 4 is cylindrical. The outer diameters are, for example, 0.35 mm and 0.3 · 8mm, 1 · 0mm. In addition, the inner conductor 4 and the outer conductor 5 疋 are composed of recording wires, and are welded to the left and right ends of the sealed wire 3 by end-face welding. The electrode portion 5 is a nickel sleeve. The lead wire 4 is inserted into and melted from the outside. Fig. 2 shows an enlarged cross section of the left end of the cold cathode tube of Fig. 1 to show a cross section of the sealed wire 3, and also shows a state diagram in which the outer lead wire 6 is connected to the outer wire 8. In addition, the wire 8 is omitted, but compared to outer conductor 6 It is very long. As shown in FIG. 2, the aforementioned sealed wire 3 has a double-layer structure, and the cylindrical outer layer 31 is made of Covar (nickel, alloy of iron, iron, and iron) having the same expansion coefficient as the glass bead 7. ). With the existence of such an outer layer 3, even if thermal expansion or contraction occurs, there will be no gap between the glass rim 7. Therefore, 'the sealing ability can be prevented from being damaged, and lighting cannot be turned on.

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In terms of the cylindrical inner layer 32, the thermal conductivity is higher than that of the outer layer 31. It is made of metal materials such as copper, beryllium (Be), wire, etc., and is used as "the core wire 8a of the hot wire 8 and the outer wire 6 are not welded, but a single metal or alloy with high thermal conductivity such as copper and aluminum The padding of the terminal 9 to each other / the connection portion of the terminal 9 can ensure higher ..., conductivity than welding. In addition, when the connection portion is at high temperature, it will have higher tensile strength than when soldering. Therefore, regardless of the tensile force acting on the connection part at any high temperature, it can prevent the occurrence of poor connection. In the cold cathode tube in the above structure, the 产生 generated in the electrode part 5 is changed from the = lead. 4 is conducted to the inner layer 32 of the sealed wire 3. Here, with the inner layer 32 having the same thermal conductivity, heat can quickly reach the left end and be more efficiently conducted to the outer conductor 6. In addition, although the thermal conductivity is higher than the inner layer 3, Low, but the outer layer 32 can also use heat conduction to transfer heat from the inner wire 4 to the outer wire 6. The heat conducted to the outer wire 6 will be further transferred to the core wire (copper wire) 8a. At this time, 'using a high thermal conductivity Terminal 9 can ensure from Thermal conductivity from the lead wire 6 to the core wire 8a. In this way, the heat of the electrode portion 5 is more efficiently transmitted to the outside of the glass tube 1, and is absorbed by the outer lead wire 6, the terminal 9, and the core wire 8 & The absorbed heat is radiated from the entire electric wire 8 through the coating layer. In the electric wire 8, since the core wire 8a of the copper wire has good thermal conductivity and is much longer than the outer wire 6, the volume and surface area are correspondingly large. Therefore, it is possible to ensure sufficient In addition, the surface of the outer conductor 6, the terminal 9, and the exposed core wire 8a can also be radiated into the surrounding air. As described above, 'only the multilayered sealing wire 3 is used to provide heat transfer.

13013pif.ptd Page 8 200425211 Fifth invention description (5) The simple structure of the wire "can promote the transmission of heat to the outside of the tube and can make use of the heat absorption and heat release of the wire, so it can prevent the electrode part 5 from overdoing it. It can prevent overheating The blackened end of the tube is promoted. The official's life can be extended further than the conventional product. In addition, the diameter of the above-mentioned sealing wire 3 is 0mm (known as 0.6ππη), but this can be correspondingly taken. Make sure that it is the diameter of the heat transfer wire. In addition, the sealed wire 3 as a whole also contributes to the improvement of the s-conductivity. Therefore, in conjunction with the presence of the inner layer 32 as a heat conduction wire, it also contributes to the temperature decrease of the electrode portion 5. FIG. 3 is a temperature of a conventional cold cathode tube using a sealed wire made of Guval with a diameter of 0.6 mm and the cold cathode tube of this embodiment, in a state where a 12-lamp tube is set in a casing of a direct type backlight. Comparison chart. The temperature is measured in four places near the high-voltage electrode, near the low-voltage electrode, in the center of the tube, and in the internal environment of the frame. The left side of the bar graph is a conventional cold cathode tube, and the right side is the cold cathode tube of this embodiment. As can be seen from the figure, the temperature of the cold-cathode tube of the present embodiment is lower near the high-voltage side electrode and near the electrode compared with the known two-cathode officer. η _ Figure 4 is a diagram comparing the temperature of a conventional cold-cathode tube with the temperature of a conventional cold-cathode tube and the cold-cathode tube of the present embodiment, the central brightness of a single tube, and the brightness per unit of power consumption. The left side of the bar graph shows the vicinity of the high-voltage side electrode, the middle side shows the vicinity of the low-voltage side electrode, and the right side shows the central part of the lamp. As can be seen from the figure, compared with the conventional cold cathode tube, the temperature of the cold cathode tube of this embodiment is lower near the high-voltage side electrode and near the low-voltage side electrode. In addition, the $ f center brightness is also increased. On the other hand, the brightness per unit of power consumption is also a few ^

200425211 V. Description of Invention (6) No change. According to the two figures of the figure, 'compared with the conventional cold cathode tube', the = pole of this embodiment can reduce the temperature of the electrode part, and can also achieve a bright = Xibu 'in the above embodiment, because The larger the diameter of the sealing wire 3 is. 'Easy, safe', conductivity, 0.8 or more is better. But even if not, it can be used to prevent the electrode part 5 from overheating to a certain extent by the presence of the inner layer 32 as a heat conduction wire. In the above embodiments, the sealing wire 3 is made of a double-layer structure (the outermost, 1 A and 2 are made of three or more layers. In this case, the outer layer (the outermost layer is ancient cutting, and the inner layer is at least One layer is a thermally conductive wire. However, not only in the above embodiment, guava is used as the material of the outer layer 31, the metal material with the same thermal expansion rate :: 1, the glass crimp of the seal 7 has (tungsten, metal可以 can also, for example, in the case of glaSS, BFW), tungsten (tungsten, W) is less useful than: :: 定 ::, the invention has been disclosed in the preferred embodiment as above, but the spirit of the invention S Anyone who is familiar with this skill will not depart from the protection scope of the present invention ^ Various modifications and retouching, so this field will be determined by the scope of the attached patent application. 13013pif.ptd Page 10 200425211

Brief description of the drawings Brief description of the drawings Fig. 1 is a sectional view of a cold cathode tube according to an embodiment of the present invention. ®2 shows the left end of the cold cathode tube in Fig. It is enlarged to show the cross-section of the sealed wire 3, and also shows the state where the outer wire 6 and the outer wire 8 are connected. FIG. 3 is a temperature comparison diagram of a conventional cold-cathode tube using a sealed wire made of Guva with a diameter of 0.6 mm and the cold-cathode tube of this embodiment in a state where 12 lamps are arranged in a frame of a direct-type backlight. . Fig. 4 is a diagram comparing the temperature of a conventional cold-cathode tube with the temperature of a conventional cold-cathode tube and the cold-cathode tube of this embodiment, the central brightness of a single tube, and the brightness per unit of power consumption. Description of reference numerals 1 a tube end 3 sealed wire 5 electrode 7 glass crimp 8 a stranded wire 1 glass tube 2 light emitting layer 4 inner wire 6 outer wire 8 outer wire 9 terminal 31 inner layer 3 2 outer layer

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Claims (1)

200425211 VI. The scope of the patent application includes 1 · a kind of cold cathode tube, including one = field officer, the mask has a light-emitting layer; inside and outside: seal line ί: again placed air-tightly through the glass tube-tube end埶 value Daoxi θ structure, one of the inner layers of the sealed wire contains a heat conduction wire, the heat conduction green + said ice,. ^ ^ S μ · ”',…, the conductivity is higher than one of the sealed wire outside: inner The lead and -electrode 胄 'are located at the glass tube and at one end of the sealed wire, and an outer lead' is located outside the glass tube but .. ^ ^, heart attack & outside. 卩, and connected to The sealed wire Another known is that the outer conductor is connected to an external wire. 2. The cold cathode tube according to item 丨 in the scope of the patent application, wherein the outer layer of the sealing wire is composed of a metal material having an expansion ratio with one of the glass tube. μj… The cold cathode tube described in item i of the patent scope, wherein the diameter of the sealed wire is 0.8 mm or more. 13013pif.ptd Page 12