KR100667441B1 - Electrode assembly for fluorescent lamp and fabricating method thereof and cold cathod fluorescent lamp - Google Patents

Abstract

A cold-cathode fluorescent lamp having a phosphor layer provided on an inner wall surface and at least both ends of a glass tube containing rare gas and mercury in an inner space hermetically sealed by an electrode assembly, wherein the electrode assembly includes an electrode disposed in the inner space. And a sealing member for hermetically sealing the end of the glass tube, and a lead wire 8 drawn out of the glass tube, wherein the sealing member has a multilayer structure in which the first metal material is covered with the second metal material, The first metal material has a higher thermal conductivity, lower electrical resistivity, higher thermal conductivity, and lower electrical resistivity than the second metal material.

Fluorescent lamp, electrode assembly, cold cathode

Description

Electrode assembly for fluorescent lamp and manufacturing method thereof and cold cathode fluorescent lamp TECHNICAL FIELD

1 is a schematic perspective view showing an example of an embodiment of a cold cathode fluorescent lamp of the present invention.

FIG. 2A is a schematic enlarged view of the electrode assembly shown in FIG. 1. FIG.

2B is an enlarged cross-sectional view of the sealing member shown in FIG. 2A.

3 shows the relationship between the diameter of the copper portion, the ratio of the cross-sectional area of the copper portion to the total cross-sectional area of the sealing member, the specific resistance, and the thermal conductivity.

4A to 4F are process drawings showing one example of a method of manufacturing the electrode assembly shown in FIGS. 2A and 2B.

Fig. 5 is a schematic enlarged view showing one example of a sealing member in which one end surface in the axial direction of the wire rod is covered with cobalt.

6A to 6F are process drawings showing one example of a method of manufacturing the cold cathode fluorescent lamp shown in FIG. 1;

♠ Explanation of the symbols for the main parts of the drawings.

1 cold cathode fluorescent lamp 2 glass tube

3: lead line 4: inner wall surface

5 internal space 6 sealing member

7 electrode 8 lead wire

10 First metal material 11 Second metal material

20 cobalt tube 22 Cu wire rod

22a single sided 30 bead glass

31 roller dice 32 dice

33 hole die 40 exhaust filling device

Field of technology

The present invention relates to an electrode assembly for a fluorescent lamp and a cold cathode fluorescent lamp.

Prior art

A common cold cathode fluorescent lamp emits light when both ends of a glass tube are hermetically sealed by an electrode assembly and a high frequency high voltage is applied to the electrode. Specifically, a phosphor layer is provided over the entire length of the inner wall surface of the glass tube, and rare gases such as argon and mercury are sealed in a predetermined pressure in the inner space. The electrode assembly also has a sealing member, an electrode pressure-welded (resistance welded) to one end of the sealing member, and a lead wire resistance-welded to the other end of the sealing member. The electrode assembly is arranged in the inner space of the glass tube, the lead wire is drawn out of the inner space, and is disposed at the end of the glass tube, and the sealing member is hermetically fixed to the end of the glass tube through the bead glass for welding. (See Japanese Patent Laid-Open No. 2001-15065, Japanese Patent Laid-Open No. 2002-279931, Japanese Patent Laid-Open No. 02-329O60, etc.).

If there is a large difference in the thermal expansion rate between the sealing member and the bead glass, the residual stress increases, and the airtightness between the sealing member and the bead glass becomes unstable. Therefore, conventionally, the sealing member made from KOVAR is used. Cobalt is an alloy adjusted so that Ni and Co are added to Fe which is a main component, and thermal expansion rate becomes substantially the same as the thermal expansion rate of the bead glass.

In recent years, as one of the uses of a cold cathode fluorescent lamp, the backlight unit for liquid crystal televisions is attracting attention. In the backlight unit, the direct type in which the fluorescent lamps are disposed on the rear surface of the liquid crystal panel is mainstream, and the number of fluorescent lamps used is also large. For this reason, in order to prevent overheating of a liquid crystal panel by heat emitted from a cold cathode fluorescent lamp, improvement of the temperature characteristic of a cold cathode fluorescent lamp is calculated | required. However, the cobalt used as the material of the sealing member has a relatively high electrical resistivity and a relatively low thermal conductivity. Specifically, the electrical resistivity at 20 [° C.] is 44 [μΩ · cm], and the thermal conductivity is 44 [W / (m · k)]. Therefore, the amount of heat generated when a high frequency voltage is applied, and the amount of heat dissipation is small. Therefore, in recent years, by using a sealing member formed of a metal material having a thermal expansion coefficient substantially the same as that of bead glass and having a higher thermal conductivity than a cobalt or a lower electrical resistivity, the improvement of the temperature characteristics of the cold cathode fluorescent lamp has been improved. We are planning. Specifically, a sealing member formed of W (tungsten), Mo (molybdenum) or the like is used.

However, tungsten, molybdenum, and the like are poor in workability and are expensive materials, resulting in an increase in the manufacturing cost of the electrode assembly, and further, an increase in the manufacturing cost of a cold cathode fluorescent lamp. For example, when tungsten is wire drawn, fine cracks and die marks are generated in the axial direction. Cracks and die marks generated in the sealing member lower the airtightness of the glass tube. Therefore, when forming a sealing member by tungsten, it is necessary to perform centerless grinding | polishing, and processing cost becomes high. Since tungsten has a high melting point, it is necessary to interpose Ni foil or the like between the sealing members and the electrodes in welding. In the case of interposing Ni foil or the like, not only the cost increases but also the thermal conductivity is inhibited by the Ni foil and the thermal conductivity decreases. On the other hand, molybdenum is more flexible than tungsten, and cracks and die marks do not occur when drawing. However, melting | fusing point is as high as tungsten and it is necessary to interpose Ni foil etc. in welding of a sealing member and an electrode.

An object of the present invention is to solve the above problems by making the sealing member a multilayer structure composed of two or more kinds of metal materials.

The cold cathode fluorescent lamp of the present invention includes a glass tube in which a phosphor layer is provided on an inner wall surface, at least rare gas and mercury are enclosed in an inner space, and an electrode assembly hermetically sealing both ends of the glass tube. The electrode assembly includes an electrode disposed in an inner space of the glass tube, a sealing member for hermetically sealing an end portion of the glass tube, and a lead wire drawn out of the glass tube. The sealing member has a multilayer structure in which at least a first metal material is covered with a second metal material, and the first metal material has a higher thermal conductivity than the second metal material. Therefore, the heat generated during the lighting of the cold cathode lamp is efficiently radiated through the electrode assembly.

As the first metal material, a metal material having a lower electrical resistivity than the second metal material may be used. When the electrical resistivity of the first metal material is lower than the electrical resistivity of the second metal material, the calorific value itself of the electrode assembly is lowered.

As the first metal material, a metal material having a higher thermal conductivity than the second metal material and having a lower electrical resistivity may be used. When the first metal material satisfies the above two conditions, the calorific value itself of the electrode assembly is suppressed low, and the generated heat is efficiently radiated.

As mentioned above, the temperature characteristic of a cold cathode fluorescent lamp is fully improved by the 1st metal material which forms the sealing member of an electrode assembly. Therefore, in selecting the 2nd metal material which forms a sealing member, it removes from the constraint on the basis of the improvement of a temperature characteristic. At the same time, since the first metal material does not come into contact with the bead glass, in the selection of the first metal material, the restrictions in terms of thermal expansion coefficient are greatly reduced. That is, the choice of the first metal material and the second metal material is greatly expanded together. Therefore, although it is not necessarily a suitable metal material from a thermal expansion rate viewpoint, a suitable metal material can be selected as a 1st metal material from a viewpoint of temperature characteristic improvement. For example, although it is not necessarily suitable from the viewpoint of thermal expansion rate, it is suitable from the viewpoint of temperature characteristic improvement, and a low cost metal material can be selected as a 1st metal material. In addition, from the viewpoint of improving the temperature characteristics, a suitable metal material can be selected as the second metal material from the viewpoint of the thermal expansion coefficient even if it is not necessarily a suitable metal material. For example, if a suitable metal material is selected as the first metal material, even if cobalt is selected as the second metal material, the temperature characteristics of the cold cathode fluorescent lamp are sufficiently improved. Moreover, even if an expensive metal material is selected as the first metal material, if the volume of the sealing member is the same as before, the amount of the expensive metal material used is relatively small, and the cost is low. In addition to the above viewpoints, in consideration of ease of processing and the like, Cu or a Cu alloy is suitable as the first metal material. Cobalt is also suitable as the second metal material.

Moreover, when the ratio of the 1st metal material and 2nd metal material which form a sealing member is made into a suitable ratio, the said effect will improve further. For example, the ratio of the cross-sectional area of the first metal material to the total cross-sectional area of the sealing member is preferably 1.5% to 68%. If the ratio of the cross-sectional area of the first metal material to the total cross-sectional area of the sealing member becomes too small, the properties (thermal conductivity or electrical resistivity) of the first metal material are erased with the properties of the second metal material. On the other hand, if the ratio of the cross-sectional area of the first metal material to the total cross-sectional area of the sealing member becomes too large, the thermal expansion rate of the entire sealing member is governed by the thermal expansion rate of the first metal material. Therefore, the ratio of the cross-sectional area of the first metal material to the total cross-sectional area of the sealing member is 1.5% to 68%, more preferably 2.2% to 55%.

As the first metal material, when a metal material having a thermal conductivity of 20 [° C.] of 12 [O [W / (m · k)] or more or an electrical resistivity of 7 [μΩ · cm] or less is selected, the above-mentioned metal material is selected. The effect is further improved. In addition, when the metal material satisfying the two conditions at the same time is selected as the first metal material, the above effect is further improved.

The electrode assembly of the present invention has the same characteristics as the electrode assembly included in the cold cathode fluorescent lamp of the present invention. Therefore, when the cold cathode fluorescent lamp is manufactured using the electrode assembly of the present invention, a cold cathode fluorescent lamp having the above effect is produced.

The method for producing an electrode assembly of the present invention includes (1) a metal material having a higher thermal conductivity than the metal material, or a metal material having a lower electrical resistivity, or a higher thermal conductivity and lower electrical resistivity inside a tube formed of a metal material. Inserting a wire rod formed of a metal material; (2) drawing the pipe and the inserted wire rod; (3) cutting the drawn tube and wire rod into a predetermined length to form a sealing member; (4) attaching an electrode to one end of the formed sealing member, and (5) attaching a lead wire to the other end of the formed sealing member. Therefore, when an electrode assembly is manufactured by the manufacturing method of the electrode assembly of this invention, the electrode assembly of this invention which has the said effect can be manufactured efficiently.

The objects, features, and advantages of the present invention described above and others are clarified by reference to the following description and accompanying drawings showing an example of the present invention.

Detailed description of the preferred embodiment

1 is a cross-sectional view schematically showing the structure of a cold cathode fluorescent lamp of the present embodiment. FIG. 2A is an enlarged perspective view schematically showing an electrode assembly included in the cold cathode fluorescent lamp of the present embodiment. FIG. 2B is an enlarged view showing a cross-sectional structure of a sealing member forming the electrode assembly.

The glass tube 2 shown in FIG. 1 is formed of the borated silicate glass. Both ends of the glass tube 2 are hermetically sealed by the electrode assembly 3. The outer diameter of the glass tube 2 is set in 1.5 to 6.0 mm in the range, Preferably it is set in the range of 1.5 to 3.0 mm. The glass tube 2 may be formed of lead glass, sodium carbonate glass, low lead glass, or the like in addition to the borosilicate glass.

On the inner wall surface 4 of the glass tube 2, the fluorescent substance layer which is not shown in figure is provided over almost full length. The phosphor for forming the phosphor layer can be arbitrarily selected from known or novel phosphors such as halophosphate phosphors and rare earth phosphors in accordance with the purpose or application. In addition, the phosphor layer may be formed by a phosphor formed by mixing two or more kinds of phosphors.

In the internal space 5 of the glass tube 2, a predetermined amount of rare gas such as argon, neon, xenon, and mercury are sealed, and the internal pressure is reduced to about one tenth of atmospheric pressure.

As shown in FIG. 2A, the electrode assembly 3 includes a sealing sealing member 6, an electrode 7 electrically or mechanically connected to an axial end of the sealing member 6, and a sealing member ( It is formed of a lead wire 8 electrically or mechanically connected to the other end of 6). The electrode 7 is formed by press-forming a conductive metal plate (for example, a nickel plate) in a cup form. The bottom face of the electrode 7 is resistance-welded to one end surface of the sealing member 6. One end of the lead wire 8 is resistance welded to the other end face of the sealing member 6 (an end face opposite to the end face on which the electrode 7 is welded), and the other end of the lead wire 8 is the glass tube 2. Is withdrawn.

As shown in FIG. 2A, the sealing member 6 has a hollow cylindrical shape. The sealing member 6 is fixed to the end of the glass tube 2 via the bead glass 30 (see FIG. 1), and hermetically seals the internal space 5 of the glass tube 2. As shown in FIG. 2B, the sealing member 6 has a cross-sectional structure of a multilayer (two layers in this example) in which the first metal material 10 is covered with the second metal material 11. Have As the first metal material 10, a material having a higher thermal conductivity and a lower electrical resistivity than that of the second metal material 11 is used.

Here, from the viewpoint of improving the heat dissipation characteristics of the electrode assembly 3 and suppressing heat generation, when the total cross-sectional area in the radial direction of the sealing member 6 is 100%, the same as that of the first metal material 10 The cross-sectional area in the direction preferably accounts for 1.5% to 68% of the total cross-sectional area, more preferably 2.2% to 55%. Further, the first metal material 10 is a metal material having a thermal conductivity of 12 [O [W / (m * k)] or more and a metal material having an electrical specific resistance of 7 [μΩ · cm] or less at 20 [° C.]. It is preferable that it is a metal material which satisfies two conditions simultaneously. It is preferable also from the viewpoint of ensuring stable manufacture of the sealing member 6 that the ratio of the cross-sectional area of the first metal material 10 to the total cross-sectional area is within the above numerical range.

The second metal material 11 on which the bead glass 30 is welded is preferably a metal material having the same or substantially the same thermal expansion coefficient as the bead glass 30.

Copper (Cu) or the alloy containing copper is one of the metal materials which satisfy | fill the conditions as said 1st metal material 10. As shown in FIG. Cobalt is one of the metal materials which satisfy | fills the conditions as the said 2nd metal materials 11.

In the case where the first metal material 10 shown in FIG. 2B is copper and the second metal material 11 is cobalt, the diameter of the copper portion and the total cross-sectional area in the radial direction of the sealing member 6 are determined. The relationship between the ratio, specific resistance, and thermal conductivity of the cross-sectional area of the copper portion is shown in FIG. 3. In addition, the diameter of the sealing member 6 is 0.8 mm.

However, as long as at least one of the following three conditions is satisfied, the first metal material 10 and the second metal material 11 are not limited to a specific metal material.

(1) The thermal conductivity of the first metal material 10 is higher than that of the second metal material 11.

(2) The electrical resistivity of the first metal material 10 is smaller than the electrical resistivity of the second metal material 11.

(3) The condition of both of said (1) and (2) is satisfied.

In this embodiment, the sealing member 6 of the two-layer structure in which the 1st metal material 10 was coat | covered with the 2nd metal material 11 was demonstrated. However, the sealing member 6 can also have a multilayer structure of three or more layers, unless it deviates from the objective of this invention. Even when the sealing member 6 has a multilayer structure of three or more layers, the metal material of the outermost layer on which the bead glass 30 is welded is a metal material having the same or substantially the same thermal expansion coefficient as the glass material. desirable. When the thermal expansion rate of the metallic material of the outermost layer of the sealing member 6 is significantly different from the thermal expansion rate of the bead glass 30, the airtightness between the bead glass 30 and the sealing member 6 is not sufficiently secured. However, there is a fear that inadequacy of sufficient welding strength cannot be obtained.

Next, an example of the manufacturing method of the electrode assembly 3 shown in FIG. 2A is demonstrated, taking the case where the 1st metal material 10 is copper and the 2nd metal material 11 is cobalt as an example.

(1) As shown in FIG. 4A, the rounded cobalt tube is welded in an argon gas atmosphere while the butted cross sections are rounded in the width direction by using a roller die 31 in a hollow (hollow) cobalt tube ( 20) is produced (cobal preparation process).

(2) As shown to FIG. 4B, the copper wire 22 is inserted in the inside of the cobalt tube 20 (wire insertion process).

(3) As shown to FIG. 4C, it passes through the swaging die 32 which rotates the cobalt tube 20 in which the wire rod 22 was inserted, and is fresh.

(4) The fresh cobalt tube 20 and the wire rod 22 are annealed in a hydrogen gas atmosphere. By this process, a metal diffusion layer is formed between the outer peripheral surface of the wire rod 22 and the inner peripheral surface of the cobalt tube 20, and the adhesion between copper and cobal is improved. Moreover, the distortion which generate | occur | produced in the cobalt tube 20 by annealing is also removed. Here, cobalt and copper may be compatible with the adhesiveness. If the adhesion between the inner circumferential surface of the tube and the outer circumferential surface of the wire rod is poor, the thermal conductivity is lowered. Therefore, in the selection of the first metal material 10 and the second metal material 11, it is also necessary to consider compatibility with respect to the adhesion. desirable.

(5) As shown in FIG. 4D, the cobalt tube 20 and the wire rod 22 pass through the hole die 33 to be fresh until the outer diameter becomes a predetermined dimension.

(6) As shown in FIG. 4E, the cobalt tube 20 and the wire rod 22 are cut to a predetermined length to form the sealing member 6.

(7) As shown in FIG. 4F, the electrode 7 is resistance welded to one end face of the formed sealing member 6, and the lead wire 8 is resistance welded to the other end face.

In addition, since the manufacturing method of the electrode 7 and the lead wire 8 is the same as that of the past, the description here is abbreviate | omitted.

In the process of said (1)-(7), the process of forming the oxide film which improves adhesiveness with a glass material on the surface of the sealing member 6 can also be added. If a firm and uniform oxide film is formed on the surface of the sealing member 6, when the sealing member 6 and the bead glass are welded, a part of the oxide film melts into the bead glass and chemically bonds to the sealing member 6 and Adhesion with bead glass improves more. As an example of the formation method of an oxide film, there exists a method of heating the surface of the cobalt tube 20 or the surface of the sealing member 6 with a burner.

As shown in FIG. 5, the end face of the wire rod 22 exposed to one end surface of the sealing member 6 to which the electrode 7 is welded is pressed by pressing one end of the sealing member 6. It is also possible to coat 22a) with the cobalt tube 20. Copper is easy to combine with oxygen or hydrogen, in particular oxygen is present in the form of Cu ₂ O. For this reason, in the cold-cathode fluorescent lamp in which the both ends of the glass tube were sealed by the electrode assembly containing copper, the possibility that the bad effect, such as oxygen release in the inner space (discharge space) of a glass tube during use, is not all. Moreover, mercury may intrude between a sealing member and bead glass, and adhesiveness may fall. However, if the end face 22a of the wire rod 22 is covered by the cobalt tube 20, the inadequacy is surely avoided. However, such inelasticity is rare, and the step of covering the end face 22a of the wire rod 22 with the cobalt tube 20 is not an essential step in achieving the object of the present invention.

Next, an example of the manufacturing method of the cold cathode fluorescent lamp 1 shown in FIG. 1 is demonstrated, referring FIGS. 6A-6F.

(1) The electrode assembly 3 manufactured via the process shown to FIG. 4A-FIG. 4F is arrange | positioned at one edge part of the glass tube 2. Specifically, as shown in FIG. 6A, the electrode assembly 3 is placed so that the electrode 7 faces the inner space 5 of the glass tube 2 and the lead wire 8 is drawn out of the glass tube 2. It is arrange | positioned at one edge part of the glass tube 2.

(2) As shown in FIG. 6B, the end of the glass tube 2 on which the electrode assembly 3 is disposed is heated and softened, and the sealing member 6 of the electrode assembly 3 is made to pass through the bead glass 30. It is airtightly fixed to the end of the glass tube (2). By this step, one end of the glass tube 2 is hermetically sealed.

(3) As shown in FIG. 6C, the electrode assembly 3 is disposed at the other end of the glass tube 2 in the same manner as in step 1, and the sealing member 6 is placed at the end of the glass tube 2. Decide At this time, the sealing member 6 is temporarily fixed so that air permeability is secured between the outer peripheral surface of the sealing member 6 and the inner peripheral surface of the glass tube 2.

(4) As shown to FIG. 6D, the edge part of the glass tube 2 to which the sealing member 6 was temporarily fixed is connected to the exhaust system of the exhaust filling apparatus 40, and the inside space 5 of the glass tube 2 is connected. Exhaust the gas. In addition, the glass tube 2 is heated to about 300-400 degreeC. By this process, the inert gas in the internal space 5 of the glass tube 2 is discharged, and the inside space 5 is pressure-reduced to predetermined pressure.

(5) As shown in FIG. 6E, the end of the glass tube 2 connected to the exhaust system is switched to the charging system, and the rare gas and mercury are filled into the inner space 5 of the glass tube 2 by a predetermined amount. . In addition, when a mercury compound exists in the glass tube 2 beforehand, only a rare gas is filled.

(6) After removing the glass tube 2 from the exhaust charging apparatus 40, as shown in FIG. 6F, the edge part of the glass tube 2 to which the sealing member 6 is temporarily fixed is heated and softened, and it seals The member 6 is hermetically fixed to the end of the glass tube 2 via the bead glass 30. By this process, the other end of the glass tube 2 is also hermetically sealed. In addition, the process after depressurizing the inner space 5 is performed while maintaining the reduced pressure state in the inner space 5, and the pressure in the inner space 5 after the both ends of the glass tube 2 are sealed is predetermined pressure. Be careful to

Although the above embodiments have been described using specific terms, the description is for the purpose of illustration only, and it is to be understood that modifications and variations are possible without departing from the spirit and scope of the claims.

According to the present invention, heat generated during the lighting of the cold cathode lamp is efficiently radiated through the electrode assembly.

Claims (42)

A cold cathode fluorescent lamp in which a phosphor layer is provided on an inner wall surface and at least both ends of a glass tube in which rare gas and mercury are sealed are hermetically sealed by an electrode assembly in an inner space. The electrode assembly has an electrode disposed in the inner space, a sealing member for hermetically sealing an end portion of the glass tube, a lead wire drawn out of the glass tube, The sealing member has a multilayer structure in which at least a first metal material is covered with a second metal material, and the first metal material has a higher thermal conductivity than the second metal material. Fluorescent lamps. A cold cathode fluorescent lamp in which a phosphor layer is provided on an inner wall surface and at least both ends of a glass tube in which rare gas and mercury are sealed are hermetically sealed by an electrode assembly in an inner space. The electrode assembly has an electrode disposed in the inner space, a sealing member for hermetically sealing an end portion of the glass tube, a lead wire drawn out of the glass tube, The sealing member has a multilayer structure in which at least a first metal material is covered with a second metal material, and the first metal material has a lower electric resistivity than the second metal material. Cold Cathode Fluorescent Lamps. A cold cathode fluorescent lamp in which a phosphor layer is provided on an inner wall surface and at least both ends of a glass tube in which rare gas and mercury are sealed are hermetically sealed by an electrode assembly in an inner space. The electrode assembly has an electrode disposed in the inner space, a sealing member for hermetically sealing an end portion of the glass tube, a lead wire drawn out of the glass tube, The sealing member has a multi-layered structure in which at least a first metal material is covered with a second metal material, and the first metal material has a higher thermal conductivity and lower electrical resistivity than the second metal material. A cold cathode fluorescent lamp characterized by the above-mentioned. The method according to any one of claims 1 to 3, The ratio of the cross-sectional area of the first metal material to the total cross-sectional area of the sealing member is 1.5% to 68%, characterized in that the cold cathode fluorescent lamp. delete delete The method according to any one of claims 1 to 3, The cold cathode fluorescent lamp of the first metal material has a thermal conductivity of 120 [W / (m · k)] or higher at 20 [° C]. delete delete The method according to any one of claims 1 to 3, The cold cathode fluorescent lamp of the first metal material, wherein the electrical resistivity at 20 [° C.] is 7 [μΩ · cm] or less. delete delete The method according to any one of claims 1 to 3, The cold cathode fluorescent lamp of claim 1, wherein the first metal material is copper or an alloy containing copper, and the second metal material is cobalt. delete delete The method according to any one of claims 1 to 3, Cold cathode fluorescence characterized in that an end surface of one side in the longitudinal direction of the sealing member is covered with the second metal material, and the electrode is mounted on the end face of the sealing member covered with the second metal material. lamp. delete delete An electrode assembly for a fluorescent lamp provided with a phosphor layer on an inner wall surface and capable of hermetically sealing both ends of a glass tube filled with at least rare gas and mercury in an inner space. An electrode disposed in an inner space of the glass tube filled with rare gas and mercury, A sealing member for hermetically sealing an end of the glass tube; Has a lead wire drawn out of the glass tube, The sealing member has a multilayer structure in which at least a first metal material is covered with a second metal material, and the first metal material has a higher thermal conductivity than the second metal material. Electrode assembly. An electrode assembly for a fluorescent lamp provided with a phosphor layer on an inner wall surface and capable of hermetically sealing both ends of a glass tube filled with at least rare gas and mercury in an inner space. An electrode disposed in an inner space of the glass tube filled with rare gas and mercury, A sealing member for hermetically sealing an end of the glass tube; Has a lead wire drawn out of the glass tube, The sealing member has a multilayer structure in which at least a first metal material is covered with a second metal material, and the first metal material has a lower electrical resistivity than the second metal material. Electrode assembly for the lamp. An electrode assembly for a fluorescent lamp provided with a phosphor layer on an inner wall surface and capable of hermetically sealing both ends of a glass tube filled with at least rare gas and mercury in an inner space. An electrode disposed in an inner space of the glass tube filled with rare gas and mercury, A sealing member for hermetically sealing an end of the glass tube; Has a lead wire drawn out of the glass tube, The sealing member has a multi-layered structure in which at least a first metal material is covered with a second metal material, and the first metal material has a higher thermal conductivity and lower electrical resistivity than the second metal material. An electrode assembly for a fluorescent lamp. The method according to any one of claims 19 to 21, The ratio of the cross-sectional area of the first metal material to the total cross-sectional area of the sealing member is 1.5% to 68%, the electrode assembly for a fluorescent lamp. delete delete The method according to any one of claims 19 to 21, The first metallic material has a thermal conductivity of 120 [W / (m · k)] or higher at 200 [° C.], wherein the electrode assembly for a fluorescent lamp is used. delete delete The method according to any one of claims 19 to 21, The first metallic material has an electrical resistivity of 7 [μΩ · cm] or less at 20 [° C.]. delete delete The method according to any one of claims 19 to 21, Wherein said first metal material is copper or an alloy comprising copper, and said second metal material is cobalt. delete delete The method according to any one of claims 19 to 21, One end surface in the longitudinal direction of the sealing member is covered with the second metal material, and the electrode is mounted on the end face of the sealing member covered with the second metal material. Electrode assembly. delete delete As a method of manufacturing an electrode assembly for a fluorescent lamp, Inserting a wire rod made of another metal material having a higher thermal conductivity than the metal material inside the tube made of the metal material; Drawing the tube and the wire rod inserted into the tube; Cutting the fresh tube and the wire rod inserted into the tube into a predetermined length; And attaching an electrode to one end of the tube cut into a predetermined length and a wire rod inserted into the tube, and attaching a lead wire to the other end thereof. As a method of manufacturing an electrode assembly for a fluorescent lamp, Inserting a wire rod made of another metal material having a lower electrical resistivity than the metal material inside the tube made of the metal material; Drawing the tube and the wire rod inserted into the tube; Cutting the fresh tube and the wire rod inserted into the tube into a predetermined length; And attaching an electrode to one end of the tube cut into a predetermined length and a wire rod inserted into the tube, and attaching a lead wire to the other end thereof. As a method of manufacturing an electrode assembly for a fluorescent lamp, A step of inserting a wire made of another metal material having a higher thermal conductivity and lower electrical resistivity than the metal material inside the tube made of a metal material; Drawing the tube and the wire rod inserted into the tube; Cutting the fresh tube and the wire rod inserted into the tube into a predetermined length; And attaching an electrode to one end of the tube cut into a predetermined length and a wire rod inserted into the tube, and attaching a lead wire to the other end thereof. The method according to any one of claims 37 to 39, A method of manufacturing an electrode assembly for a fluorescent lamp comprising pressing the end of the tube and covering the end surface of the wire with the metal material forming the tube. delete delete

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