TWI259494B - 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, beryllium 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

1259494

V. INSTRUCTION DESCRIPTION OF THE INVENTION (1) Field of the Invention The present invention relates to a cold cathode tube which is used as liquid crystal display light. The back of the prior art is generally near, the material is set, and the outer end is 8-241693 to 30,0 lang, "August, August, the above-mentioned additional glass group investment and opening case. The invention is as a liquid crystal display. The cold cathode tube of the backlight of the device is provided with an inner conductor and an electrode portion at the inner end portion of the tube, and an outer conductor of the inner portion of the inner end portion of the tube. Refer to the Official Gazette of the Japanese Patent Gazette, pages 4 to 5, Figure 2). This cold cathode tube has a long life of J 2 50'0 hours. For example, refer to Fujioka Shinichi's high efficiency cold cathode fluorescent light. Lights, monthly publications • pages 82 to 84. In the case of a longer life, it is necessary to take into account the 2-body protective film, change the shape of the electrode, and control the amount of mercury: change yn, any method requires a considerable amount of equipment. In other words, in view of the above-mentioned conventional problems, the pole tube can be realized more simply to achieve the above and other purposes. The cold cathode tube comprises: a glass tube, a material which is arranged to be hermetically penetrated through the glass, Inner Layer of the Sealing Wire The object of the present invention is to provide a cold and sinister life. The present invention proposes a cold cathode tube. The inner surface has a light-emitting layer; the inner and outer ends of the tube of the sealing line are composed of a multi-layer structure containing heat conduction lines and heat of the heat conduction line.

1259494 V. INSTRUCTIONS (2) The conductivity is higher than the inside of the tube outside the sealing wire, and the connection between the dense wire and the electrode part is located outside the glass glass tube, and is connected to the dense, one know, and the outer guide and the line Located on an external wire. At the other end of the spring material, the outer conductor is connected to the frame to form the structure of the above-mentioned structure, and the heat conduction layer is provided; and only the = transmission of the sealing line 'multiple inner conductors to the sealing wire = = = And the heat generated by the competition will be from

The electrode section is overheated. Thereby, it can be real; long = prevention In addition, in the above cold cathode tube, the sealing soul 2 = long odd life. The temperature is the same as that of the glass tube. The heat expansion rate is as follows: t heat expansion or contraction, and the density = can prevent the sealing ability from being destroyed, and can not be lit at 0. 8mm or more. In this case, the 埶 path can be ensured correspondingly. In addition, the sealing wire as a whole contributes more to the thermal conductivity. Therefore, it is possible to more reliably prevent overheating of the electrode portion. The above-mentioned objects, features, and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments of the invention. Sectional view. This cold cathode

1259494 V. INSTRUCTIONS (3) The official system is used for the direct type backlight or side backlight of the liquid crystal display device, the viewing machine for viewing the X-ray film, the backlight of the kanban, and the light box for viewing the negative film (lighting box) ) and other devices. In Fig. 1, the cold cathode tube comprises: a glass tube 1 having a light-emitting layer 2 on its inner surface, a sealing wire 3 penetrating the inside and outside of the tube end 1a of the glass tube 1, and inner wires connected to one end of the sealing wire 3 inside the glass. (inner lead) 4^^ pole part 5, and in the glass tube! Externally connected to the other two tn lines of the sealing wire 3: 〇uter iead)6. The outer side of the sealing wire 3 is covered with a glass bead 7 to hermetically seal the glass tube 1 ° wire 6, the sealing wire 3 and the inner wire 4 are round, for example, 〇.35_ , 0.8 Yan,. Further, the poor #@μ is composed of a nickel wire, and is melted to the left and right end portions of the one wire member 3 by the end face fusion method. The electrode portion 5 is a nickel bushing (n^ι 6 = the inner conductor 4 is externally inserted therein and melted together. 3 Λ = the left end side of the cold cathode tube of Fig. 1 is enlarged to show the sealing wire. In addition, the outer conductor is shown. 6 state diagram of connection with external wire 8. It is very long. $略了-部分分分, but compared to the outer conductor 6,

P As shown in Fig. 2, the above-mentioned sealing wire 3 is composed of the 古 丄 丄 λ λ 人 人 古 古 古 古 古 古 a a a a a a a a a a a a a a a 。 。 。 。 。 。 With the presence of such outer #31, gp #$ generates thermal expansion or contraction, and the presence of ^31 of the disk glass bead 7 can produce no gap between the lane edges 7 even if it is produced. Prevent problems such as damage to the sealing ability and failure to light. another

1259494 V. Inventive Note (4) The cylindrical inner layer 32 is composed of copper, beryium (Be), aluminum J = metal material having a higher conductivity than the outer layer 31, and functions as a "thermal conduction line". The core wire 8a of the wire 8 and the outer wire 6 are not welded, but are terminated by a terminal 9 filled with copper, = heat transfer, and a high-rate single-metal or alloy Ϊ 错 : wrong, at the terminal 9 The connection ensures a higher... and V rate than soldering. In addition, the joint has a higher tensile strength than when welded at a high temperature. Therefore, it is possible to prevent the occurrence of poor connection regardless of the tensile force acting on the joint at any time at a high temperature.

In the cold cathode tube of the above structure, the heat generated in the electrode portion 5 is conducted from the inner lead 4 to the inner layer 32 of the seal wire 3. Here, by the 内 曰 = high inner layer 32, heat can quickly reach the left end, and the ❿ is more efficiently conducted to the outer conductor 6. Further, although the thermal conductivity is lower than that of the inner layer 31, the outer layer 32 can also transfer heat from the inner wire 4 to the outer wire 6 by heat conduction. Passing to the external guide, the heat of 6 will be further transmitted to the core wire (copper wire) 8 & In this case, the thermal conductivity from the outer lead 6 to the core 8a can be ensured by the terminal 9 of the thermal conductivity. Thus, 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 6, the terminal 9, and the core. The heat absorbed by the core wire 8a is radiated from the entire electric wire 8 via the coating layer. In the electric wire 8, since the core wire 8a of the copper wire has a good thermal conductivity and is much longer than the outer wire 6, the volume and the surface area are also relatively large. Therefore, sufficient heat absorption and heat release can be ensured. Further, the surface of the outer wire 6, the terminal 9 and the exposed core wire 8a can also be radiated to the surrounding air. As described above, 'only use the multilayered sealing wire 3 and set the heat transfer.

13013pif.ptd Page 8 1259494 V. INSTRUCTIONS (5) The simple structure of the conductors can promote the transfer of heat to the outside of the tube, and can utilize the heat absorption and heat release of the wires, thereby preventing overheating of the electrode portion 5. Therefore, it is possible to suppress the blackening of the tube end due to overheating. Thereby, the life of the cold cathode tube can be extended further than conventional products. Further, the diameter of the above-mentioned sealing wire 3 is 〇 8 mm (commonly known as 0 · 6 mm), but it is thereby possible to correspondingly ensure the straight position of the inner layer 3 2 as the heat conducting wire. In addition, the sealing wire 3 as a whole contributes more to the improvement of the thermal conductivity. Therefore, the presence of the inner layer 32 as a heat conduction line contributes to the temperature drop of the electrode portion 5.

Fig. 3 shows four places where the cold cathode tube having a diameter of 0.6 mm and the 12 tubes in the casing of the present embodiment are placed in the vicinity of the high voltage electrode and in the low pressure interior. The bar graph side is the cold cathode tube of this embodiment. The temperature in the vicinity of the cold cathode tube electrode of this embodiment was lowered from the tube. A conventional comparison of the temperature of the frame of the direct type backlight in the conventional sealed wire. The temperature measurement electrode is near the center of the lamp tube and the left side of the frame is a conventional cold cathode tube. The figure on the right shows that the conventional cold cathode is compared with the conventional cold cathode tube near the surface pressure side electrode and the low pressure side. It is a single lamp (a lamp), and the temperature of the cold cathode tube, the centrality of the single tube, and the redundancy (4). The left side of the bar graph shows the vicinity of the low-voltage side electrode near the high-voltage side electrode, and the light bulb in the right side shows that the temperature near the side electrode and the low-voltage side electrode is lower than that of the conventional cold cathode tube. The lower cathode...the central brightness of the pressure is also increased. On the other hand, the energy per unit is used.

13013pif.ptd Page 9 1259494 V. Description of invention (6) No change. From the above two figures, compared with the conventional cold cathode tube, the cold cathode tube can reduce the Thunder, four, and n L. $low electrode / dish, and can also achieve bright

Further, in the above embodiment, since the sealing wire 3 is relatively easy to ensure thermal conductivity, 8% or more is preferable. However, if & is not 0.8_ (e.g., 0.6_), the effect of preventing the electrode portion 5 from being overheated can be obtained by the presence of the internal sound 32 as the heat conduction line. Further, in the above embodiment, the seal wire 3 is formed in a two-layer structure, but it may have a structure of three or more layers. In this case, the outer layer (the outermost layer) is the ancient cut, and at least one layer of the inner layer is the heat conduction line. Further, in the above embodiment, the ancient cut is used as the material of the outer layer 31, but the crucible is not limited thereto, such as the metal having the same thermal expansion rate as the glass bead 7 of the glass tube seal portion. The material may also be, for example, in the case of tungsten glass (BFW), tungsten (^, ^, w) is good.

In the above, although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and anyone skilled in the art will be able to do various things without departing from the scope of the work. Modifications and refinements, therefore, the scope of this protection is subject to the definition of the scope of the patent application.

13013pif.ptd Page 10 1259494 Brief Description of the Drawings Brief Description of the Drawings Fig. 1 is a cross-sectional view showing a cold cathode tube according to an embodiment of the present invention. Fig. 2 is a view showing a state in which the left end side of the cold cathode tube of Fig. 1 is enlarged to show a cross section of the sealing wire 3, and the outer lead 6 is connected to the external electric wire 8. Fig. 3 is a comparison of the temperature of a conventional cold cathode tube using a sealed wire composed of a georgette having a diameter of 0.6 mm and the cold cathode tube of the present embodiment in a state where a 12-lamp tube is disposed in a frame of a direct type backlight. Figure. Fig. 4 is a diagram showing 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 in a single lamp tube (one tube). 1 a tube end 3 sealing wire 5 electrode part 7 glass bead 8a core line 3 2 outer layer diagram label description 1 glass tube 2 luminescent layer 4 inner wire 6 outer wire 8 external wire 9 terminal 31 inner layer

13013pif.ptd Page 11

Claims (1)

1259494 VI. Application for patent scope What is claimed is: 1. A cold cathode tube comprising: a glass tube, an inner mask having a light-emitting layer, a sealing wire, disposed to be airtight, and inner and outer, consisting of a multilayer structure, the two ends of the glass door a heat conduction line, the heat transfer of the heat conduction line ^ ^ = one of the inner layers of the wire comprises: a v-rate 咼 outside the one of the sealed wire, an inner wire and an electrode portion, located inside the 兮 茨 破 管One end of the sealing wire is connected to the sealing wire; and an outer wire is connected to the outside of the glass tube, and the connecting end is reversed to the other end of the sealing bead, and the outer wire is further connected to an external electric wire. 2. The cold cathode tube according to claim 1, wherein the outer layer of the sixteen wires is composed of a metal material having the same thermal rate as the sealing portion of the glass tube. The cold cathode tube according to claim 1, wherein the diameter of the sealing wire is 〇. 8 m m or more.