TW201013738A - Electrode for cold cathode fluorescent tube and cold cathode fluorescent tube using the same - Google Patents

Abstract

The present invention provides an electrode for a cold cathode fluorescent tube having excellent anti-sputter capability and workability and capable of reducing tube voltage, and a cold cathode fluorescent tube using the same. The cold cathode fluorescent tube (1) includes an electrode (3) for cold cathode fluorescent tube, which is made from an alloy composed of Mo, Fe of 0.1-30 mass percentage relative to the total amount and unavoidable impurities. Preferably, the above-mentioned alloy contains Mo of 0.1-10 mass percentage relative to the total amount and, more preferably, the alloy contains Mo of 0.1-5.5 mass percentage relative to the total amount and further contains Ru. In another embodiment, the above-mentioned alloy contains Nb of 0.1-10 mass percentage relative to the total amount.

Description

201013738 SUMMARY OF THE INVENTION [Technical Field] The present invention relates to an electrode for a cold cathode fluorescent tube and a cold cathode fluorescent tube using the same. [Prior Art] A cold cathode fluorescent tube is widely used as a backlight source for a liquid crystal display. The cold cathode fluorescent tube has a glass tube having a small diameter and a pair of electrodes for a cold cathode fluorescent tube, and the inside of the glass tube is sealed with an inert gas such as Hg and Ar, Ne, and a phosphor is coated on the inner wall surface; A pair of cold cathode fluorescent tube electrodes are attached to both ends of the glass tube in the tube axis direction with respect to each other. By applying a high voltage between the electrodes of a pair of cold cathode fluorescent tubes, an electric field is generated in the cold cathode fluorescent tube, and electrons are emitted from the non-heated cathode (cold cathode). Then, when the electron collides with the Hg atom, the Hg atom is excited, and the ultraviolet light emitted when the Hg atom migrates from the excited state to the base φ state is irradiated onto the phosphor, thereby being emitted from the phosphor. Visible light. In the prior art, an electrode composed of substantially only Mo is known as an electrode for a cold cathode fluorescent tube (refer to Japanese Laid-Open Patent Publication No. 2000-136320). Although the electrode for the cold cathode fluorescent tube has a low tube voltage and good energy efficiency, there is a problem in that Mo is extremely expensive, the manufacturing cost is high, and since Mo is hard, it is processed into an electrode. difficult. Therefore, an electrode for a cold cathode fluorescent tube is known as an electrode for reducing the Mo content in order to suppress the manufacturing cost while obtaining a relatively good -5 - 201013738 processability (refer to Japanese Laid-Open Patent Publication No. 2006_1-2505 ). That is, the electrode for the cold cathode fluorescent tube contains Mo in a range of from 6 to 35 % by mass relative to the total amount, and the remainder is composed of an alloy of Ni and an unavoidable impurity. Further, since Ni is excellent in plastic workability, in the prior art, the electrode for the cold cathode fluorescent tube 'is substantially an electrode composed only of Ni is widely used' and various kinds of Ni-based alloys have been proposed. _ The electrode for the cold cathode fluorescent tube. For example, the inventors of the present invention have proposed an electrode for a cold cathode fluorescent tube comprising a Ni-based alloy containing Mo and Nb (refer to Japanese Laid-Open Patent Publication No. 2007_3 1 83 2). At the same time, the electrode for the cold cathode light-emitting tube made of Ni and the electrode for the cold-cathode fluorescent tube made of a Ni-based alloy are substantially Ni atoms which are formed by the source of the Ni. The Hg atom enclosed in the glass tube reacts to consume the Hg atom. As a result, the electrode for the cold cathode honey tube which is substantially composed of Ni and the electrode for the cold cathode fluorescent tube which is made of a Ni-based alloy have a short life of the cold cathode fluorescent tube and serve as an environment. An object of the present invention is to provide an electrode for a cold cathode fluorescent tube capable of solving the above problems and an electrode using the same. Cold cathode egg tube '--6-201013738 has excellent sputtering resistance and workability, and can also provide a cold cathode fluorescent tube using the electrode for cold cathode, which can suppress the present environment The low mercuryation of the countermeasures. In order to achieve the above object, the inventors of the present invention have conceived that Fe can be used as a lower cost than Mo and is a Ni element. However, since the discharge characteristics of the electrode composed of only Fe are insufficient, it is attempted to add a part of the metal element. As a result, it was found that the electrode for a cold cathode fluorescent tube comprising the electrode of the cold cathode fluorescent tube including the predetermined base alloy and the electrode for cold cathode fluorescent tube and the sputtering resistance. Then, the present inventors have improved the sputtering resistance by using the above-described cold cathode fluorescent tube electrode containing Mo, and it is possible to reduce the φ and use a cold cathode which is substantially composed only of Fe. The problem of rust, but the cold cathode Mo formed by the alloy containing the predetermined portion is substantially Fe, preferentially acquires oxygen and forms a film, and as a result, in order to achieve the above object, the electrode of the present invention is characterized in that The electrode for a cold cathode fluorescent tube of the invention comprising a relatively total amount of Mo, Fe, and an unavoidable impurity is preferably in the range of 0.1 to 10% by mass. Reduce the tube voltage. At the same time, the electrode for the fluorescent tube and the reaction with mercury have been subjected to various investigations, and the cold-cathode fluorescent tube of the metal which is more resistant to sputtering has Fe which is mainly in the range of Fe, and has substantially only The superior discharge characteristics, Fe made of Ni-based alloy replace Ni, and the voltage of the tube. Further, when the electrode for the light-emitting tube is used, there are Mo in the circumference and the electrode for the remaining-pole fluorescent tube, and I suppress and rust. The cold cathode fluorescent tube is composed of gold in the range of 1 to 30% by mass. Further, the present alloy contains a relatively full amount of 201013738. In order to achieve a low tube voltage, the electrode for a cold cathode fluorescent tube of the present invention preferably contains Mo in a range of from about 1.5% to about 5% by mass based on the total amount of the alloy. In the electrode for a cold cathode fluorescent tube of the present invention, the alloy may further contain Ru in an amount of 5% by mass or less based on the total amount. According to the above configuration, the tube voltage can be further reduced. Further, according to the composition of the above-mentioned alloy, Ru is taken up as oxygen, and a film made of ruthenium oxide is formed, whereby rust of Fe in the alloy can be further suppressed. φ Further, the electrode for a cold cathode fluorescent tube of the present invention is preferably an alloy containing Nb, Fe, and unavoidable impurities in a range of from 0.1 to 3% by mass in a range of from 0.1 to 3% by mass in a total amount of from 0.1 to 30% by mass. Composition. In the electrode for a cold cathode fluorescent tube of the present invention, since the alloy contains Nb in the above range, it is possible to suppress the rust of the Fe-based alloy and improve the corrosion resistance while improving the sputtering resistance. The electrode for a cold cathode fluorescent tube of the present invention can be applied to a cold cathode fluorescent tube. [Embodiment] Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The cold cathode fluorescent tube 1 of the present embodiment shown in FIG. 1 is used for a backlight source or the like for a liquid crystal display, for example, a glass tube 2 having a diameter of 3 mm and a length of 300 mm, and two ends mounted on the inside of the glass tube 2. A pair of electrodes 3 for cold cathode fluorescent tubes. Hereinafter, the electrode 3 for the cold cathode fluorescent tube will be briefly described as the electrode 3. -8 - 201013738 The glass tube 2 is coated with a well-known phosphor on the inner wall surface, and is internally filled with an inert gas such as Hg, Ar or Ne. The cold cathode fluorescent tube electrode 3 is, for example, a bottomed cylindrical body having an opening, and has an opening having an outer diameter of 2.1 mm, a tube wall thickness of 1515 mm, and a length of 7.0 mm. The cold cathode fluorescent tube electrode 3 may be formed in a thin plate shape, but by forming the bottomed cylindrical body, the electrons can be easily emitted. A pair of cold cathode fluorescent tube electrodes 3 are attached to the glass tube 2 The openings of the respective electrodes 3 are opposed to each other in the axial direction of the glass tube 2. A sealing pin 4 is formed at the bottom of the electrode 3 for the cold cathode fluorescent tube, and the sealing pin 4 is formed of a Kovar wire, sealed to the glass tube 2, and protrudes to the outside of the glass tube 2. An external lead 5 formed of Dumet wire is connected to the end of the sealing pin 4 on the side opposite to the electrode 3 for the cold cathode fluorescent tube. Further, glass beads (not shown) for sealing the glass tube 2 are provided in the sealing pin 4. The electrode 3 for a cold cathode fluorescent tube is composed of an alloy containing Fe, a relatively total amount of Mo in the range of 0.1 to 10% by mass, and an unavoidable impurity. In the above-described alloy constituting the electrode 3, the electrode 3 for cold cathode fluorescent tubes of the present embodiment contains Fe as a base element. Thereby, it is possible to suppress the reaction between the sputtered particles sputtered from the surface of the electrode 3 and the electrode 3 and the Hg atoms in the glass tube 2, thereby suppressing the consumption of Hg and extending the life of the cold cathode fluorescent tube 1. Further, the electrode 3 for cold cathode fluorescent tubes in the present embodiment is in the above-mentioned alloy constituting the electrode 3' by -9-201013738

Fe as a base element can attain a low cost as a basic electrical characteristic of an electrode and excellent workability. However, if the alloy constituting the electrode 3 for cold cathode fluorescent tubes is substantially Fe alone, the discharge characteristics are not sufficient. Therefore, in the electrode 3 for cold cathode fluorescent tubes in the present embodiment, Mo in the above content range is added to the above alloy. In the electrode 3 for a cold cathode fluorescent tube of the present embodiment, the alloy containing the above-described content range of Mo can reduce the tube voltage at the time of discharge and improve the electron emission characteristics. Further, in the electrode 3 for cold cathode fluorescent tubes of the present embodiment, by causing the alloy to contain Mo in the above-described range, rust of the Fe-based alloy can be suppressed. Further, the electrode 3 for cold cathode fluorescent tubes of the present embodiment can suppress the reaction between the Fe-based alloy and Hg by causing the alloy to contain Mo in the above-described range. In the alloy of the electrode 3 for the cold cathode fluorescent tube, when the content of Mo is less than 0.1% by mass relative to the total amount, the electron emission characteristics cannot be improved, and the tube voltage cannot be lowered. Meanwhile, when the content of Mo is less than 0.1% by mass relative to the total amount, the rust of the Fe-based alloy cannot be suppressed, and the reaction of the Fe-based alloy with Hg cannot be sufficiently suppressed. On the other hand, in the above alloy, when the content of Mo is more than 1% by mass relative to the total amount, an intermetallic compound such as FezMo or Fe3Mo3 which reflects brittleness is formed in the alloy, or, due to an increase in hardness On the other hand, the workability is lowered, and the electrode 3 for cold cathode fluorescent tubes having a desired shape cannot be formed. Further, in order to obtain the above-described effect of containing Mo more reliably, in the above-mentioned alloy of -10-201013738, the content of Mo is preferably in the range of 1.5 to 5.5% by mass relative to the total amount. Further, the electrode 3 for cold cathode fluorescent tubes in the present embodiment can be composed of the following alloy. That is, the alloy contains, in addition to Fe, a relatively total amount of Mo in the range of 0.1 to 10% by mass, and unavoidable impurities, and also contains Ru in an amount of not more than 5% by mass. In this case, the tube voltage can be further lowered and the life of the cold cathode fluorescent tube 1 can be extended. In the above alloy, if the content of Ru is more than 5% by mass relative to the total amount, the tube voltage cannot be further lowered, and the cost is also increased. In the above alloy, in order to more reliably achieve the effect of reducing the tube voltage obtained by adding Ru, the content of Ru can be set to be in the range of 0.1 to 5% by mass relative to the total amount. Further, the electrode 3 for cold cathode fluorescent tubes in the present embodiment may be made of the following alloy. Namely, the alloy contains Nb in a range of from 〇 to 6% by mass in addition to Fe, a relative amount of Mo in the range of 0.1 to 30% by mass, and unavoidable impurities. In this case, when the content of Mo is less than 0.1% by mass relative to the total amount, the electron emission characteristics cannot be improved, and the tube voltage cannot be lowered. Meanwhile, in the above alloy, when the content of Mo is less than 0.1% by mass relative to the total amount, the growth of the Fe-based alloy cannot be suppressed, and the reaction of the Fe-based alloy with Hg cannot be sufficiently suppressed. On the other hand, in the above alloy, when the content of Mo is more than 30% by mass relative to the total amount, the voltage of the -11 - 201013738 tube of the electrode 3 for the cold cathode fluorescent tube cannot be lowered. In addition, when the content of Mo is more than 30% by mass based on the total amount, an intermetallic compound such as Fe2Mo or Fe3Mo 3 which reflects brittleness is formed in the alloy, or the hardness is increased. As a result, the workability is lowered, and the cold cathode fluorescent tube electrode 3 having a desired shape cannot be formed. Further, the electrode 3 for the cold cathode fluorescent tube of the present embodiment can reduce the tube voltage at the time of discharge and improve the electron emission characteristics by causing the alloy to contain Nb in the above-described content range. Further, by causing the alloy 3 to contain Nb in the above-mentioned content range, the electrode 3 can improve the sputtering resistance and suppress the rust of the Fe-based alloy and improve the corrosion resistance. At this time, in the above alloy, when the content of Nb is less than 全·1% by mass relative to the total amount, the above effects cannot be obtained. On the other hand, when the content of Nb is more than 6% by mass relative to the total amount, an intermetallic compound such as Fe2Nb which reflects brittleness is formed in the alloy, or the workability is lowered due to an increase in hardness, and An electrode 3 for a cold cathode fluorescent tube having a desired shape is formed. Next, the examples and comparative examples are presented. (First Embodiment) In the present embodiment, first, 10 kg of an ingot composed of Fe and Mo was melted in a vacuum melting furnace to prepare a molten metal, and the molten metal was formed into a block of a predetermined shape. The above block contained Mo in an amount of 3.4% by mass relative to the total amount, and the remainder was composed of Fe and an alloy of unavoidable impurities. The above-mentioned unavoidable impurities contain a total amount of 〇.1 ()% by mass to C, 0.50 mass at 201013738, relative to the above alloy. /. The following si, 〇.50 mass% or less of Mn, 0 _ 0 5 mass ° /. The following p, 0, 50% by mass or less of S. Next, the block was subjected to hot forging at a temperature of 1100 t: to obtain a plate having a thickness of 20 mm. Subsequently, a sheet having a thickness of 1 mm was obtained by subjecting the above-mentioned sheet having a thickness of 2 mm to wire cutting. Then, by honing the above-mentioned plate having a thickness of 1 mm, the scale (xx scale) generated by the above-mentioned wire cutting was removed. Next, the sheet having a thickness of 1 mm after the above scale was removed was subjected to cold rolling at room temperature and annealing at a temperature of 800 ° C in a hydrogen atmosphere, thereby obtaining a sheet having a thickness of 0.2 mm. Subsequently, the thin plate having a thickness of 0.2 mm was subjected to annealing at a temperature of 800 °C in a hydrogen atmosphere for 1 minute, and then cooled to a normal temperature to obtain an electrode material for the electrode 3 for cold cathode fluorescent tubes. Subsequently, the Vickers hardness of the electrode material obtained in the present example was measured, and the enthalpy was 156 HV. The results are shown in Table 1. Then, exactly as in the present example, the Vickers hardness of the electrode material (Reference Example 1) which was substantially composed only of Ni and the remainder was unavoidable impurities was measured and the 値 was 75 HV. The results are shown in Table 1. Next, 'the resistivity of the electrode material obtained in the present example was measured by the four-probe method', and the enthalpy was 19·7 μΩ·(; ηι. The results are shown in Table 1 and Fig. 2. Subsequently, the measurement was completely the same as in the present example. The resistivity of the electrode material in Reference Example 1 was 4.6 pi^cin. The results are shown in Table 1. Then, using the electrode material obtained in this example, two longitudinal lengths of 20 mm and widths of 20 mm were produced. -2mm test piece. -13- 201013738 First, the first test piece was placed in the air for 2,160 hours to confirm whether it was rusted, and the result was not rust. Next, the second test piece was placed in the test piece. In the vacuum chamber of the sputtering apparatus, sputtering was continuously performed for 8 hours under the condition of supplying electric power of 150 W in an Ar environment of 5.33 <10_leaf & and then, the above test piece after continuous sputtering was measured by measuring The sputtering rate of the electrode material obtained in the present example was calculated by reducing the weight. Then, the electrode material of Reference Example 1 was exactly the same as that of the present example, and a test piece was prepared by measuring the continuous sputtering. The test piece reduces the weight and calculates The sputtering rate of the electrode material. When the sputtering rate of the electrode material of Reference Example 1 was set to 100%, the sputtering rate of the electrode material of the present example was 59%. The results are shown in Table 1. In the meantime, the lower the sputtering rate 値, the less the consumption due to sputtering is, and the better the sputtering resistance is. Next, using the electrode material obtained in the present example, the length is 15 mm and the width is wide. A pair of thin plate-shaped electrodes for cold cathode fluorescent tubes of 1.5 mm and a thickness of 0.2 mm. Next, in order to evaluate the performance of the electrode 3 for cold cathode fluorescent tubes obtained in the present example, a cold cathode tube A was produced, which was cold. The cathode tube A has a pair of thin-plate cold cathode fluorescent tube electrodes 3 on the inner wall surface of the glass tube to which the phosphor is not coated. Considering whether or not the atom is sputtered from the cold cathode fluorescent tube electrode 3 and For the convenience of the reaction of Hg, the cold cathode tube A uses a glass tube whose inner wall surface is not coated with a phosphor. First, in order to form the cold cathode tube A, the -14-201013738 formed of the Kova wire is sealed. The pin 4 is connected to a pair of thin plates obtained in this embodiment The end portion of the electrode 3 for the cold cathode fluorescent tube is connected to the end portion of the sealing pin 4 opposite to the electrode 3 for the cold cathode fluorescent tube, and the external lead 5 formed of Dumet wire is connected. The pin 4 is provided with glass beads (not shown) for sealing with the glass tube 2. Next, in a glass tube having a diameter of 3 mm and a length of 300 mm on which the inner wall surface is not coated with the phosphor, The electrode 3 for a cold cathode fluorescent tube having a thin plate shape to which the sealing pin 4_ is connected is provided at the end. In this case, a pair of cold cathode fluorescent tube electrodes 3 are provided in the axial direction so that the sealing pin 4 is not connected. The ends on the sides are opposed to each other. Subsequently, after Hg, Ar, and Ne gas are sealed inside the glass tube, the sealing pin 4 is sealed with the glass tube. At this time, the sealing pin 4 is protruded to the outside of the glass tube to obtain a cold cathode tube A. Then, a tube current of 5 m A, 6 m A, 7 m A, and 8 m A was applied between the pair of electrodes 3 of the formed cold cathode tube A, and a tube generated for each tube current of φ was measured. Voltage. The results are shown in Fig. 3. Next, a pair of thin plate-shaped electrodes for cold cathode fluorescent tubes as Reference Example 2 were prepared, and a cold cathode tube having the pair of electrodes was prepared. Here, the electrode is completely the same as the present embodiment except that an electrode material which is substantially composed only of Mo and the remainder is unavoidable impurities is used. A tube current of 5 mA, 6 mA, 7 mA, and 8 mA was applied between the pair of electrodes of the formed cold cathode tube B, and the tube voltage generated for each tube current was measured. The results are shown in Fig. 3. Moreover, FIG. 4 shows a tube voltage generated when a tube current of 8 mA is applied to the above-described cold cathode tube A (having the electrode 3 of the cold cathode fluorescent tube of -15-201013738 of the present embodiment) with respect to the above-mentioned cold cathode tube. B (the electrode for the cold cathode fluorescent tube of Reference Example 2) has a ratio of the tube voltage generated when a tube current of 8 mA is applied. Then, the cold cathode tube A was discharged for 200 hours under the condition that the tube current was fixed at 6 mA, and then the cold cathode tube A was opened, and the cold cathode fluorescent tube electrode 3 was taken out. Subsequently, in order to check whether or not atoms were sputtered from the electrode 3 for cold cathode fluorescent tubes and reacted with Hg, the surface composition of the electrode 3 and the inner wall surface of the glass tube were measured by an electron micro-detector (electron probe Micro Analyzer). composition. The results are shown in Tables 2 and 3, and Table 2 shows the surface composition of the electrode 3 for cold cathode fluorescent tubes. Table 3 shows the composition of the inner wall surface of the glass tube. Next, using the electrode material obtained in the present example, two pairs of cold cathode fluorescent tube electrodes 3 were formed, the electrode 3 being a bottomed cylindrical body having an opening on one side, and the outer diameter of the opening portion was 2.1 mm, and the tube wall After the thickness of the cold cathode fluorescent tube 1 having the electrode 3 for the cold cathode fluorescent tube obtained in the present embodiment was evaluated for mercury consumption, a cold cathode fluorescent tube la was produced. The cold cathode fluorescent tube 1a has a pair of cold cathode fluorescent tube electrodes 3 having a bottomed cylindrical body inside the glass tube 2 to which the phosphor is coated on the inner wall surface. First, in order to form the cold cathode fluorescent tube 1a, the sealing pin 4 formed of the Kova wire is connected to the end of the pair of bottomed cylindrical cold cathode fluorescent tube electrodes 3 obtained in the present embodiment. At the end of the sealing pin 4 opposite to the electrode 3, an external lead 5-16-201013738 formed of Dumet wire is connected. Glass beads (not shown) for sealing the glass tube are provided on the sealing pin 4. Next, a cold cathode fluorescent tube having a bottomed cylindrical body to which a sealing pin 4 is attached is attached to both ends of a glass tube 2 having a diameter of 3 mm and a length of 5 69 mm and having a phosphor coated on the inner wall surface. Electrode 3. At this time, a pair of cold cathode fluorescent tube electrodes 3 are axially disposed so that the ends on the side to which the sealing pin 4 is not connected are opposed to each other. @ Subsequently, Hg, Ar gas, and Ne gas are sealed inside the glass tube 2. The above sealing was carried out in such a manner that the total pressure of the Ar gas and the Ne gas reached 5.3 kPa. Then, the sealing pin 4 and the glass tube 2 are sealed. At this time, the sealing pin 4 is protruded to the outside of the glass tube to obtain a cold cathode fluorescent tube 1a. Next, the prepared cold cathode fluorescent tube 1a of the present embodiment was discharged for 2000 hours under the condition that the tube current was fixed at 8 mA. Subsequently, the glass tube 2 was heated at a temperature of 240 ° C, and the amount of mercury emitted from the glass tube 2 was measured as a effective amount of mercury using a mercury measuring device in a fluorescent tube, and the measured enthalpy was 3.64 g. The amount of effective mercury described above corresponds to the amount of metallic mercury which is not consumed during the above discharge. Thereafter, the glass tube 2 was heated at a temperature of 900 ° C, and the amount of mercury emitted from the glass tube 2 was measured as the amount of mercury consumed, and the measured enthalpy was 0.04 g. The amount of mercury consumed is equivalent to the amount of mercury consumed by the phosphor consumed during the discharge and the compound adhering to the tube wall. The sum of the above-mentioned effective mercury amount and the above-mentioned consumed mercury amount corresponds to the total amount of mercury enclosed in the glass tube 2 when the cold cathode fluorescent tube 1a is produced. Then, the mercury consumption rate at the above discharge -17 - 201013738 was calculated according to the following formula (1). The results are shown in Table 4. Mercury consumption rate (%) = {% of mercury consumed (g) / total amount of mercury (g) } X 1 〇〇 (%) · · · ( 1 ) Next, a pair of bottomed cylindrical cold cathode fluorescent light is produced The electrode for the tube is the same as the embodiment except that the electrode material of the first embodiment is used, and the cold cathode fluorescent tube of the first example is fabricated, and the cold cathode fluorescent tube is coated on the inner wall. The glass tube having a length of 5 6 9 mm coated with a phosphor has the pair of electrodes described above. Subsequently, in the same manner as in the first embodiment, the cold cathode fluorescent tube of the present embodiment was discharged for 2 000 hours under the condition that the tube current was fixed at 8 mA, and the mercury consumption rate at the time of discharge was calculated. . The results are shown in Table 4. Then, in order to evaluate the service life of the cold cathode fluorescent tube 1 having the electrode 3 for the cold cathode fluorescent tube produced in the present embodiment, a cold cathode fluorescent tube lb was produced, which was cold. The cathode fluorescent tube 1b is identical to the cold cathode fluorescent tube 1a of the present embodiment except that the length of the glass tube 2 is 300 mm. Next, the cold cathode fluorescent tube 1b of the present example thus produced was discharged under the condition that the tube current was 8 mA, and the center luminance at this time was measured. Subsequently, by performing a Lehmann approximation on the obtained result, the time required for the center luminance of the cold cathode fluorescent tube lb to be halved is calculated. The results are shown in Fig. 5 and Table 5. Next, an electrode for a cold cathode fluorescent tube having a pair of bottomed cylindrical bodies is produced, and -18-201013738 is identical to the present embodiment except that the electrode material of Reference Example 1 is used. In the cold cathode fluorescent tube of the first example, the cold cathode fluorescent tube has the pair of electrodes inside the glass tube having a length of 300 mm. Subsequently, in the same manner as in the present embodiment, the cold cathode fluorescent tube of the present embodiment thus produced was discharged under the condition that the tube current was fixed at 8 mA, and the center luminance at the time of discharge was measured. Subsequently, the time required for halving the center luminance of the cold cathode fluorescent tube of the present embodiment was calculated by performing a Lehmann approximation on the obtained result. The results are shown in Fig. 5 and Table 5. (Embodiment 2) In this embodiment, the electrode material of this embodiment was fabricated. The electrode material was completely the same as that of the first embodiment except that an alloy containing relatively 6.6% by mass of Mo and the remainder being unavoidable impurities was used. Next, the Vickers hardness of the electrode material obtained in the present example was measured in the same manner as in Example 1, and the enthalpy was 200 HV. The results are shown in Table 1. Subsequently, the electrical resistivity of the electrode material obtained in the present example was measured in the same manner as in Example 1, and the enthalpy was 26.0 μΩ·cm. The results are shown in Table 1 and Figure 2. Then, with respect to the electrode material obtained in the present example, a test piece was prepared in exactly the same manner as in Example 1, and the sputtering of the electrode material was calculated by measuring the reduced weight of the test piece after continuous sputtering. rate. When the sputtering rate of the electrode material of Reference Example 1 was set to 100%, the sputtering rate of the electrode material of the present example was equivalent to 65%. The results are shown in Table 1. Thereafter, in the same manner as in the first embodiment, a pair of thin plate-shaped electrodes 3 for cold cathode fluorescent tubes were produced using the electrode material obtained in the present example, and a cold cathode tube C was formed, which was in the cold cathode tube C. The inner wall surface is not coated with the inside of the glass tube of the phosphor, and has the pair of electrodes 3 described above. Next, in the same manner as in the first embodiment, a tube current of 8 mA was applied between the pair of electrodes 3 of the formed cold cathode tube C, and the generated tube voltage was measured. The ratio of the tube voltage of the above-described cold cathode tube C to the tube voltage of the above-described cold cathode tube B is shown in Fig. 4 . (Embodiment 3) In this embodiment, the electrode material of this embodiment was produced. The electrode material was completely the same as that of the first embodiment except that an alloy containing a relatively total amount of Mo of 9.9% by mass, the remainder being Fe, and unavoidable impurities was used. Next, the Vickers hardness of the electrode material obtained in the present example was measured in the same manner as in Example 1, and the enthalpy was 291 HV. The results are shown in Table 1. Subsequently, the specific resistance of the electrode material obtained in the present example was measured in the same manner as in Example 1, and the enthalpy was 26.2 μΩ·(:πι. The results are shown in Table 1 and Fig. 2. Then, with respect to the present example The obtained electrode material was subjected to a test piece in exactly the same manner as in Example 1, and the sputtering rate of the electrode material was calculated by measuring the reduced weight of the test piece after continuous sputtering from -20 to 201013738. When the sputtering rate of the electrode material of Reference Example 1 was set to 100%, the sputtering rate of the electrode material of the present embodiment was 71%. The results are shown in Table 1. Thereafter, it was identical to that of Example 1. In the manner of using the electrode material obtained in the present embodiment, a pair of thin plate-shaped electrodes 3 for cold cathode fluorescent tubes are produced, and a cold cathode tube D is formed, which is not coated with a phosphor on the inner wall surface. Inside the glass tube, the pair of electrodes 3 were provided. Next, in the same manner as in the first embodiment, a tube current of 8 mA was applied between the pair of electrodes 3 of the formed cold cathode tube D, and the generated tube voltage was measured. Shown in Figure 4 The ratio of the tube voltage of the cold cathode tube D to the tube voltage of the cold cathode tube B is described. (Embodiment 4) In the present embodiment, the electrode material of the present embodiment was fabricated. Except for the alloy containing a relatively total amount of 0.17 mass% of Mo, the remainder being Fe, and unavoidable impurities, the same as in the first embodiment. Next, in the same manner as in the first embodiment, the obtained by the present example was measured. The Vickers hardness of the electrode material, which is 1 13 HV. The results are shown in Table 1 . Subsequently, the resistivity of the electrode material obtained in the present example was measured in the same manner as in Example 1, and the enthalpy was 11. ΟμΩ κιη The results are shown in Table 1 and Fig. 2. Then, with respect to the electrode material obtained in the present example, a test piece was prepared in the same manner as in Example-21 - 201013738 by measuring the continuous sputtering. The weight of the test piece was reduced, and the sputtering rate of the electrode material was calculated. When the sputtering rate of the electrode material of Reference Example 1 was set to 100%, the sputtering of the electrode material of the present example was carried out. The results are shown in Table 1. The results are shown in Table 1. Thereafter, a pair of thin plate-shaped electrodes for cold cathode fluorescent tubes 3 were produced in the same manner as in Example 1 using the electrode material obtained in the present example. The cold cathode tube E is provided, and the cold cathode tube E has the pair of electrodes 3 inside the glass tube to which the phosphor is not coated on the inner wall surface. Next, in the same manner as in the first embodiment, the cold is made. A tube current of 8 mA was applied between the pair of electrodes 3 of the cathode tube E, and the generated tube voltage was measured. Fig. 4 shows the ratio of the tube voltage of the cold cathode tube E to the tube voltage of the cold cathode tube B. (Embodiment 5) In the present embodiment, the electrode material of the present embodiment was produced. Regarding the electrode material, an alloy containing a relatively full amount of 1.7% by mass of Mo, the remainder being Fe, and unavoidable impurities was used. Other than the first embodiment, it is identical. Next, the Vickers hardness of the electrode material obtained in the present example was measured in the same manner as in Example 1, and the enthalpy was 149 HV. The results are shown in Table 1. Subsequently, the resistivity of the electrode material obtained in the present example was measured in the same manner as in Example 1, and the enthalpy was 15.4 μΩ κιη. The results are shown in Table 1 and Figure 2. -22- 201013738 Then, with respect to the electrode material obtained in the present example, a test piece was prepared in exactly the same manner as in Example 1, and the electrode was calculated by measuring the reduced weight of the test piece after continuous sputtering. The sputtering rate of the material. When the sputtering rate of the electrode material of Reference Example 1 was set to 100%, the sputtering rate of the electrode material of the present example was equivalent to 57%. The results are shown in Table 1. Thereafter, in the same manner as in the first embodiment, a pair of thin plate-shaped electrodes 3 for cold cathode fluorescent tubes were produced using the electrode material obtained in the present example, and a cold cathode tube F was formed, and the cold cathode tube F was The inner wall surface is not coated with the inside of the glass tube of the phosphor, and has the pair of electrodes 3 described above. Next, in the same manner as in the first embodiment, a tube current of 8 mA was applied between the pair of electrodes 3 of the formed cold cathode tube F, and the generated tube voltage was measured. The ratio of the tube voltage of the above-described cold cathode tube F to the tube voltage of the above-described cold cathode tube B is shown in Fig. 4 . (Embodiment 6) In this embodiment, the electrode material of this embodiment was fabricated. The electrode material was completely the same as that of the first embodiment except that an alloy containing a relatively total amount of 5.0% by mass of Mo and the remainder being Fe and unavoidable impurities was used. Next, the Vickers hardness of the electrode material obtained in the present example was measured in the same manner as in Example 1, and the enthalpy was 175 HV. The results are shown in Table 1. Subsequently, the resistivity of the electrode material obtained in the present example was measured in the same manner as in Example 1, and the enthalpy was 23.8 μΩ·ί: ηη. The results are shown in Table 1 and Figure 2 in -23-201013738. Then, with respect to the electrode material obtained in the present example, a test piece was prepared in exactly the same manner as in the example, and the sputtering of the electrode material was calculated by measuring the reduced weight of the test piece after continuous sputtering. rate. When the sputtering rate of the electrode material of Reference Example 1 was set to 100%, the sputtering rate of the electrode material of the present example was equivalent to 5 7%. The results are shown in Table 1. Thereafter, in the same manner as in the first embodiment, a pair of thin plate-shaped electrodes 3 for cold cathode fluorescent tubes were produced using the electrode material obtained in the present example, and a cold cathode tube G was formed, and the cold cathode tube G was The inner wall surface is not coated with the inside of the glass tube of the phosphor, and has the pair of electrodes 3 described above. Next, in the same manner as in the first embodiment, a tube current of 8 mA was applied between the pair of electrodes 3 of the formed cold cathode tube G, and the generated tube voltage was measured. The ratio of the tube voltage of the above-described cold cathode tube G to the tube voltage of the above-described cold cathode tube B is shown in Fig. 4 . In this comparative example, the electrode material of this comparative example was produced. Regarding the electrode material, except that a metal consisting of substantially only Fe and the remainder being unavoidable impurities was used, 'others are identical to the first embodiment. Next, in the same manner as in the first embodiment, the comparison is performed. The Vickers hardness of the electrode material obtained in the example was 110 HV. The results are shown in Table 1. Subsequently, in the same manner as in the first embodiment, the electrical resistivity of the electrode material obtained by the comparison of -24-201013738, fg =, was measured, and the enthalpy was 1 〇.1 μίί·ςΐη. The results are not shown in Table 1 and Figure 2. Then, with respect to the electrode material obtained in the present comparative example, a test piece was prepared in exactly the same manner as in Example 1, and the sputtering of the electrode material was calculated by measuring the reduced weight of the test piece after continuous sputtering. rate. When the sputtering rate of the electrode material of Reference Example 1 was set to 100%, the sputtering rate of the electrode material of the comparative example was equivalent to 58%. The results are shown in Table 1. Thereafter, in the same manner as in the first embodiment, a pair of thin plate-shaped electrodes for cold cathode fluorescent tubes were fabricated using the electrode material obtained in the comparative example, and a cold cathode tube was formed, and the cold cathode tube was The inner wall surface is not coated with the inside of the glass tube of the phosphor, and has the pair of electrodes. Then, in the same manner as in the first embodiment, a tube current of 5 mA, 6 mA, 7 mA, and 8 mA was applied between the pair of electrodes of the formed cold cathode tube, and the tubes generated for the respective tube currents were respectively measured. Voltage. The results are shown in Figure 3. The ratio of the voltage of the tube 10 of the above-mentioned cold cathode tube 相对 to the tube voltage of the above-mentioned cold cathode tube 示出 is shown in Fig. 4 . Subsequently, in the same manner as in the first embodiment, the surface composition of the electrode for the cold cathode fluorescent tube of the above cold cathode tube and the composition of the inner wall surface of the glass tube were measured by enthalpy. The results are shown in Table 2 and Table 3. In this comparative example, the electrode material of this comparative example was produced. Regarding the electrode material, except that an alloy containing a relatively total amount of 15.3 mass% of Mo, the remainder being Ni, and unavoidable impurities was used, it was exactly the same as that of the first embodiment. Next, the Vickers hardness of the electrode material obtained in the present comparative example was measured in the same manner as in Example 1, and the enthalpy was 305 HV. The results are shown in Table 1. Subsequently, the resistivity of the electrode material obtained in the present comparative example was measured in the same manner as in Example 1, and the enthalpy was 72·6 μΩ·( ΐ 。. The results are shown in Table 1. Then, regarding the electrode obtained by the present comparative example Materials, a test piece was prepared in exactly the same manner as in Example 1, and the sputtering rate of the electrode material was calculated by measuring the reduced weight of the test piece after continuous sputtering. When the electrode of Reference Example 1 was used When the sputtering rate of the material was set to 100%, the sputtering rate of the electrode material of the comparative example was equivalent to 11%. The results are shown in Table 1. Thereafter, in the same manner as in Example 1, the use was carried out. In the electrode material obtained in the comparative example, a pair of thin plate-shaped electrodes for cold cathode fluorescent tubes were produced, and a cold cathode tube J was formed. The cold cathode tube J has the inside of a glass tube on which the phosphor is not coated on the inner wall surface. Next, in the same manner as in the first embodiment, the surface composition of the electrode for the cold cathode fluorescent tube of the cold cathode tube J and the composition of the inner wall surface of the glass tube were measured by ΕΡΜΑ. The results are shown in Table 2 and Table. 3 (Comparative Example 3) In this comparative example, the electrode material of the comparative example was produced, and the electrode material was used except that Mo was contained in a relatively total amount of 16.0% by mass, the remainder was Fe, and unavoidable impurities were used. In addition to the alloy, it is -26-201013738 which is identical to the first embodiment. Next, in the same manner as in the first embodiment, the Vickers hardness of the electrode material obtained in this comparative example was measured, and the enthalpy was 490 HV. In the following Table 1. The resistivity of the electrode material obtained in the present comparative example was measured in the same manner as in Example 1, and the enthalpy was 33·6 μΩ·ηη. The results are shown in Table 1 and Fig. 2 . Then, with respect to the electrode material obtained in this comparative example, a test piece was prepared in exactly the same manner as in Example 1, and the sputtering of the electrode material was calculated by measuring the reduced weight of the test piece after continuous sputtering. When the sputtering rate of the electrode material of Reference Example 1 was set to 100%, the sputtering rate of the electrode material of the comparative example was equivalent to 65%. The results are shown in Table 1 and thereafter, and the examples. One finish In the same manner, a pair of thin plate-shaped electrodes for cold cathode fluorescent tubes were produced using the electrode material obtained in the comparative example, and a cold cathode tube was formed, which was not coated with φ phosphor on the inner wall surface. The inside of the glass tube was provided with the above-mentioned pair of electrodes. Next, in the same manner as in the first embodiment, a tube current of 8 mA was applied between a pair of the electrodes of the formed cold cathode tube, and the generated tube voltage was measured. The ratio of the tube voltage of the cold cathode tube K to the tube voltage of the cold cathode tube B is shown in Fig. 4. (Comparative Example 4) In this comparative example, the electrode material of this comparative example was produced. The electrode material was identical to that of the first embodiment except that an alloy containing a relatively total amount of 23.3% by mass of Mo -27-201013738, the remainder being Fe, and unavoidable impurities was used. Next, the Vickers hardness of the electrode material obtained in this comparative example was measured in the same manner as in Example 1, and the enthalpy was 493 HV. The results are shown in Table 1. Subsequently, the specific resistance of the electrode material obtained in the present comparative example was measured in the same manner as in Example 1, and the enthalpy was 36·2 μΩ·(: ηι. The results are shown in Table 1 and Fig. 2. Then, regarding the comparison For the electrode material obtained in the same manner as in the first embodiment, a test piece was prepared, and the sputtering rate of the electrode material was calculated by measuring the reduced weight of the test piece after continuous sputtering. When the sputtering rate of the electrode material of Example 1 was set to 100%, the sputtering rate of the electrode material of the comparative example was 83%. The results are shown in Table 1. Thereafter, in exactly the same manner as in the first embodiment, A pair of thin plate-shaped electrodes for cold cathode fluorescent tubes were produced using the electrode material obtained in the comparative example, and a cold cathode tube L was formed. The cold cathode tube L was inside the glass tube to which the phosphor was not coated on the inner wall surface. There is a pair of electrodes described above. Next, in the same manner as in the first embodiment, a tube current of 8 mA was applied between a pair of the above-mentioned electrodes of the formed cold cathode tube L, and the generated tube voltage was measured. Out of the above cold cathode tube L Tube voltage than the tube voltage to the cold cathode tube relative to the B. -28-201013738 (Table 1)

Mo mm%) Fe (% by mass) Ni (MM%) Vickers hardness (HV) Resistivity (μΩ-cm, sputtering rate (%) Reference Example 1 - - 100* 75 4.6 100 Example I 3.4 Remaining part* 156 19.7 59 Example 2 6.6 Remaining part * A 200 26.0 65 Example 3 9.9 Remaining part * A 291 26.2 71 Example 4 0.17 Remaining part * A 113 11.0 58 Example V 1.7 Remaining part * A 149 15.4 57 Example Six 5.0 Remaining part * 175 Bu 23.8 57 Comparative Example 1 - 100* - 110 10.1 58 Comparative Example 2 15.3 Remaining part * 305 72.6 111 Comparative Example 3 16.0 Remaining part * One 490 33.6 65 Comparative Example 4 23.3 Remaining part * One 493 36.2 83 *: Containing unavoidable impurities As apparent from Table 1, the electrode materials of Examples 1 to 6 have smaller Vickers hardness and excellent workability than the electrode materials of Comparative Example 2. The electrode material of the first to sixth embodiments is composed of an alloy containing Mo in a range of from 0.17 to 9.9% by mass relative to the total amount, and an alloy partially remaining Fe. The electrode material of the above Comparative Example 2 is made of a relative amount of ® The amount of Mo in the range of 15.3 mass% and the alloy in which the remainder is substantially Ni. Generally, for metal materials, the material having a lower Vickers hardness is more excellent in cold plastic workability, and the Vickers hardness is at 300 HV. In the following, it is easy to carry out cold working. Therefore, it is apparent from the results of Table 1 that the electrode materials of the first to sixth embodiments can be easily processed into the electrode 3 for the cold cathode fluorescent tube of the first embodiment. It can be clearly seen that the sputtering rate of the electrode material of Comparative Example 2 is larger than that of the electrode material of Reference Example 1. The electrode material of the above Comparative Example 2 is composed of Mo in a range of 15.3 mass% relative to the total amount, and remaining -29- 201013738 Partially composed of an alloy of Ni. The electrode material of the above Reference Example 1 consists essentially of only Ni. On the other hand, it is apparent that the sputtering rate of the electrode materials of Examples 1 to 6 is higher than that of the reference example. The electrode material of one of the above embodiments is small. The electrode material of the first embodiment to the sixth embodiment is composed of Mo in a range of from 0.17 to 9.9% by mass relative to the total amount, and the remainder is substantially Fe. Therefore, it is apparent that the electrode materials of the first to sixth embodiments have excellent sputtering resistance due to a small sputtering rate. Further, it is apparent from Fig. 2 that the larger the Mo content and the higher the specific resistance Therefore, it is apparent that the electrode materials of the first to sixth embodiments have excellent discharge characteristics. In particular, when the content of Mo is more than 1% by mass relative to the total amount, the electrical resistivity sharply rises, so it is apparent that in the electrode material containing Mo and composed of a Fe-based alloy, it is preferable to use Mo. The content is set to be 10% by mass or less based on the total amount. Further, as is apparent from Fig. 3, the electrode 3 for the cold cathode fluorescent tube of the first embodiment is smaller than the electrode for the cold cathode fluorescent tube of the first comparative example consisting of only Fe, although the content of Mo is small. The voltage is small. The electrode 3 for cold cathode fluorescent tubes of the first embodiment described above is composed of an alloy having a content of relatively 3.4 mass% of Mo and a remainder of substantially Fe. Meanwhile, it is apparent that the tube voltage when the electrode 3 for the cold cathode fluorescent tube of the first embodiment is used is closer to the tube voltage when the electrode for the cold cathode fluorescent tube consisting of substantially only Mo is used in Reference Example 2. . Therefore, it is apparent that the electrode 3 for the cold cathode fluorescent tube of the first embodiment has a low tube voltage and is excellent in energy efficiency.

Further, as is apparent from Fig. 4, when the tube current is set to 8 mA -30 to 201013738, the electrode 3 for cold cathode fluorescent tubes of the first to sixth embodiments and the electrode 3 of the first embodiment are substantially composed only of Fe. The tube voltage of the cold cathode fluorescent tube is smaller than that of the electrode. The cold cathode camping tube electrode 3 of the above-described first to sixth embodiments is composed of an alloy having a content of Mo in a range of from 0.17 to 9.9 mass% relative to the total amount and a Fe content substantially in the remainder. Further, it is apparent that the electrode 3 for cold cathode fluorescent tubes of Examples 1, 5, and 6 in which the content of Mo is in the range of 1.5 to 5.5% by mass relative to the total amount and the remainder is substantially Fe is particularly low in tube voltage, and energy efficiency. More good. (Table 2) Composition of electrode table 15 (% by mass) Mo Fe Ni Hg 0 Example 1 3.6 96.4 — — — Comparative Example 1 — 97.5 — 2.5 — Comparative Example 2 10.52 — 68.69 — 20.79 φ was not detected (Table 3 \ Composition of the inner wall of the glass tube (% by mass) Mo Fe Ni Hg 0 Na A1 Si K Example 1 - 3.3 - 56.8 0.7 1.8 31.9 5.5 Comparative Example 1 - 3.9 - 57.1 0.6 1.7 31.2 5.5 Comparative Example II 1.5 43.33 1.2 46.16 — 0.38 6.47 0.96 -: Not detected. Further, it can be clearly seen from Table 2 that the surface of the electrode 3 is in the cold cathode tube A (electrode 3 having the thin plate-shaped cold cathode fluorescent tube of the first embodiment). There is no Hg atom on it. Further, as apparent from Table 3, in the above-mentioned cold cathode tube A, the inner wall surface of the glass tube has a relatively total amount of 3.3% by mass of Fe atoms, but there is no Hg atom. This is considered to be due to the presence of Mo on the surface of the electrode 3 for the cold cathode fluorescent tube. Therefore, in the above-described cold cathode tube A, although the Fe atoms constituting the electrode 3 are slightly sputtered, an alloy (amalgam) is not formed on the surface of the electrode 3 and the inner wall surface of the glass tube. From this, it is clear that the cold cathode tube A does not consume Hg in the glass tube due to the formation of the amalgam, and the service life of the cold cathode tube A can be prolonged. On the other hand, as is apparent from Table 2, in the cold cathode tube Η (the electrode for the cold cathode fluorescent tube having a thin plate shape of Comparative Example 1), a relatively total amount of Hg atoms of 2.5% by mass is present on the surface of the electrode. . Therefore, it is apparent that in the cold cathode tube crucible, although only a trace amount is present, Fe and Hg react on the surface of the above electrode. Therefore, it is clear that the cold cathode tube consumes Hg in the glass tube due to the formation of the amalgam, and the service life of the cold cathode tube is shortened. Further, as is clear from Table 3, in the cold cathode tube J (the electrode for the thin-plate cold cathode fluorescent tube of Comparative Example 2), a relatively total amount of 1.5% by mass of Mo atoms and 44.3 3 were present on the inner wall surface of the glass tube. Mass% of Ni atoms and 1.2% by mass of Hg atoms. Therefore, it is apparent that in the cold cathode tube J, Mo atoms and Ni atoms constituting the above electrode are sputtered in a large amount and adhere to the inner wall surface of the glass tube, forming an amalgam composed of Ni and Hg which are easily reacted with Hg. . Therefore, it is clear that the cold cathode tube J consumes Hg' in the glass tube due to the formation of the amalgam, and the service life of the cold cathode tube J becomes short. -32-201013738 Therefore, it is clear that the inside of the glass tube 2 coated with the phosphor on the inner wall surface has the cold cathode fluorescent tube 1 of the electrode 3 for the cold cathode fluorescent tube of each of the first to sixth embodiments, Since the Hg' in the glass tube is not consumed due to the formation of the amalgam, the life of the fluorescent tube 1 can be prolonged.

Example 1 Reference Example 1 Effective Mercury Amount (g) 3.64 2.11 Mercury Consumption (g) 0.04 0.27 Total Ice Silver (g) 3.68 2.3B Mercury Consumption Rate (%) 1.09 11.34 As is clear from Table 4, Example 1 The electrode for cold cathode fluorescent tube 3 is particularly low in mercury consumption compared with the electrode for cold cathode fluorescent tube which is substantially composed of Ni only in Reference Example 1. The electrode 3 for a cold cathode fluorescent tube of the first embodiment described above is composed of an alloy having a content of 3.4% by mass relative to the total amount of Mo and a remainder of substantially Fe. Therefore, it is understood that the consumption of Hg in the glass tube 2 of the cold cathode 萤 fluorescent tube 1 of the first embodiment is extremely small, and the life of the fluorescent tube 1 can be prolonged. (Embodiment 7) In this embodiment, the electrode material of this embodiment was produced. The electrode material was completely the same as that of the first embodiment except that an alloy containing a relatively total amount of 3.4% by mass of Mo, a relative amount of 0.6% by mass of Ru, and the remainder being Fe and an unavoidable impurity was used. Next, the Vickers hardness of the electrode material obtained in the example of the present invention - 33 - 201013738 was measured in exactly the same manner as in Example 1, and the enthalpy was 153 HV. Subsequently, the electrical resistivity of the electrode material obtained in the present example was measured in the same manner as in Example 1, and the enthalpy was 22.1 μΩ·cm. Then, with respect to the electrode material obtained in the present example, a test piece was prepared in exactly the same manner as in Example 1, and the sputtering of the electrode material was calculated by measuring the reduced weight of the test piece after continuous sputtering. rate. When the sputtering rate of the electrode material of Reference Example 1 was set to 100%, the sputtering rate of the electrode material of the present example was equivalent to 71%. Thereafter, in the same manner as in the first embodiment, a pair of bottomed cylindrical cold cathode fluorescent tube electrodes 3 are produced using the electrode material obtained in the present embodiment, and a cold cathode fluorescent tube 1 is formed. The cold cathode fluorescent tube 1 is provided inside the glass tube 2 having a length of 300 mm of a phosphor coated on the inner wall surface, and has the electrode 3. Subsequently, except that the cold cathode fluorescent tube 1 obtained in the present embodiment was used, the same as in the present example, the center luminance at the time of discharge under a condition of a tube current of 8 mA was measured, and the result was obtained by The Lehmann approximation calculates the time required to halve the center luminance of the cold cathode fluorescent tube 1. The results are shown in Fig. 5 and Table 5. (Table 5) Time (time) for halving the service life. Example 1 333000 Example 7 480000 Reference Example 1 213000 201013738 According to FIG. 5 and Table 5, the cold cathode fluorescent tube 1 of the first embodiment and the reference example can be inferred. Compared with the cold cathode fluorescent tube of the first embodiment, the time required for halving the center luminance is longer, and the cold cathode fluorescent tube 1 of the seventh embodiment is halved compared with the cold cathode fluorescent tube 1 of the first embodiment. It takes longer. Therefore, it is apparent that the cold cathode fluorescent tube 1 of the seventh embodiment in particular can extend the service life. The cold cathode fluorescent tube 1 of the first embodiment described above has the electrode 3 for a cold cathode fluorescent tube having a content of 3.4% by mass relative to the total amount of Mo and a remaining portion substantially Fe. The cold cathode fluorescent tube 1 of the above-described seventh embodiment has an electrode having a content of about 3.4% by mass relative to the total amount of Mo, a relative amount of 6% by mass of Ru, and a remaining portion of substantially 1^ of the cold cathode fluorescent tube electrode. The cold cathode fluorescent tube of the above-mentioned Reference Example 1 has an electrode for a cold cathode fluorescent tube which is substantially composed only of Ni. (Embodiment 8) In the present embodiment, in the first place, Fe, Mo, and Nb were melted in a vacuum melting furnace to prepare a molten metal and cast, thereby producing an ingot having a weight of about 10 kg. The ingot described above contains Mo and 1.6 masses in a relative total amount of 3.4% by mass. /. The Nb and the remainder are composed of Fe and an alloy of unavoidable impurities. The above unavoidable impurities contain a total mass of 〇.1 相对 relative to the above alloy. The following c, 0.50% by mass or less of Si, 〇_80% by mass or less of Mu, 〇.〇5 mass% or less of P, and 0.50% by mass or less of S °, respectively, except that the present embodiment is used. Other than the obtained ingot, the other -35-201013738 was fabricated in the same manner as in the first embodiment. Subsequently, in the same manner as in the first embodiment, the test piece was prepared using the electrode material obtained in the present example, and the sputtering of the electrode material was calculated by measuring the reduced weight of the test piece after continuous sputtering. Rate of incidence. Then, an electrode material (Reference Example 3) consisting essentially of only Ni and the remainder being unavoidable impurities was prepared in the same manner as in the present example, and a test piece was prepared by measuring the test piece after continuous sputtering. The reduced weight was calculated and the sputtering rate of the electrode material was calculated. When the sputtering rate of the electrode material of Reference Example 3 was set to 100%, the sputtering rate of the electrode material of the present embodiment was equivalent to 69.1%. The results are shown in Table 6. Next, in order to evaluate the workability of the electrode material obtained in the present example, a tensile test was conducted. First, the ingot obtained in the present example was subjected to hot forging at a temperature of 1100 °C, and was repeatedly subjected to cold rolling at normal temperature and annealing at 800 °C in a hydrogen atmosphere. After annealing at 800 ° C for 10 minutes in a hydrogen atmosphere, the test piece was rounded by cooling to room temperature. The round bar test piece had a small diameter portion as a parallel portion and a large diameter portion at both ends of the test piece, and had a parallel length of 24 mm and a diameter of 8 mm. Subsequently, the round bar test piece was subjected to a tensile test at a tension speed of 24 mm/sec, and the tensile strength was measured to be 502 N/mm2. Further, the length and the diameter of the parallel portion of the round bar test piece after the tensile test were measured, and the elongation and the necking ratio of the tensile test were calculated, and the elongation was 34.9% and the necking rate was 59.6%. The results are shown in Table 7. Then, with respect to the electrode material of Reference Example 3, a round bar test piece was produced in exactly the same manner as in the present example, and a tensile test was performed to measure the tensile strength and the necking rate while measuring the tensile strength of Zhang-36-201013738. The intensities were 36 lN/mm2, the elongation was 18.8%, and the necking rate was shown in Table 7. Next, in the same manner as in the first embodiment, two pairs of the thin plate-like cold cathode electrodes 3 of the present embodiment were produced using the electrode material of the present invention. Subsequently, in order to evaluate the performance of the cold cathode fluorescent A 3 obtained in the present embodiment, a cold cathode tube which is identical to the first embodiment has a diameter of 3 mm which is not coated on the inner wall surface. The inside of the glass tube having a length of 300 mm has a plate-shaped electrode 3. Then, the upper tube was discharged for 300 hours under the condition that the tube current was fixed at 6 mA, and then the cold cathode tube M and the electrode 3 for the fluorescent tube were opened. Next, in order to check the presence or absence of atoms sputtered from the cold cathode electrode 3 and the reaction with Hg, the surface composition of the electrode 3 for cold cathode fluorescent tubes and the composition of the above-mentioned glass surface are determined by φ. As a result, anhydrous silver atoms on the inner wall of the glass tube of the electrode 3 for cold cathode fluorescent tubes are shown in Table 8. Next, in the same manner as in the present embodiment except that the electrode material of Reference Example 3 was used, a pair of thin plate-shaped electrodes for cold tubes were fabricated to prepare a cold cathode tube N having the electrodes (refer to the obtained cold cathode tube N). The composition of the inner wall surface of the surface glass tube of the electrode for cold cathode fluorescent tubes was measured by ΕΡΜΑ in the same manner as in the first example. The results are shown in Table 8. The tension was found to be 6.4%. The tube is made of an electrode, and the phosphor is coated with a pair of thin cold cathodes to take out the cold cathode fluorescent tube ΕΡΜΑ the inner surface of the glass tube and the rest with the cathode fluorescent example 3). In the same manner as in the glass-37-201013738, in order to evaluate the performance of the electrode 3 for the cold cathode fluorescent tube obtained in the present embodiment, a cold cathode fluorescent tube lc is formed in the same manner as in the first embodiment, and the cold is formed. The cathode fluorescent tube lc is coated on the inner wall surface with a phosphor having a diameter of 3 mm and a length of 300 mm, and has a pair of thin electrodes. Next, tube currents of 5 mA, 6 mA, 7 mA, and 8 mA were applied to the pair of the electrodes 3 of the cold cathode fluorescent tube 1 of the present embodiment, and the tube voltages generated for the respective tube currents were measured. The results are shown in Figure 6. Then, in addition to the electrode material of Reference Example 1, an electrode for a cold cathode fluorescent tube was fabricated in the same manner as in the present embodiment, and a cold cathode fluorescent tube having the electrode was prepared (Reference Example 3) ). A tube current of 5 mA, 6 mA, 7 mA, and 8 mA was applied to each of the pair of electrodes of the prepared cold cathode fluorescent tube, and the tube voltage generated for each tube current was measured. The results are shown in Figure 6. (Comparative Example 5) In this comparative example, the electrode material of this comparative example was produced. The electrode material is completely the same as that of the eighth embodiment except that a metal which is substantially composed only of Mo and the remainder is an unavoidable impurity is used. Next, in the same manner as in the eighth embodiment, a test piece was prepared using the electrode material obtained in the comparative example, and the sputtering rate of the electrode material was calculated by measuring the reduced weight of the test piece after continuous sputtering. When the sputtering rate of the electrode material of Reference Example 3 was set to 100%, the sputtering rate of the electrode material -38 - 201013738 of the comparative example was equivalent to 83.4%. The results are shown in Table 6. Subsequently, in the same manner as in the eighth embodiment, a round bar test piece was prepared on the electrode material obtained in the comparative example, and a tensile test was performed to measure the tensile strength, and the elongation and the necking rate were calculated, respectively, and the tension was obtained. The strength was 33 5 N/mm 2 , the elongation was 2.4%, and the necking rate was 1.6%. The results are shown in Table 7. Then, in the same manner as in the eighth embodiment, an electrode material obtained by the comparative example was used to form a pair of thin plate-shaped electrodes for cold cathode fluorescent tubes, and a cold cathode tube P was formed. The inside of the glass tube to which the wall surface is not coated with the phosphor has the pair of electrodes. Next, with respect to the above-described cold cathode tube P, the surface composition of the electrode for cold cathode fluorescent tubes and the composition of the inner wall surface of the glass tube were measured by ΕΡΜΑ in the same manner as in the eighth embodiment. The results are shown in Table 8. Subsequently, in the same manner as in the eighth embodiment, using the electrode material obtained in the present comparative example, a pair of thin plate-shaped cold cathode fluorescent tubes were fabricated and used to form a cold cathode fluorescent tube, which was made into a cold cathode fluorescent tube. The light pipe has a pair of electrodes inside the glass tube to which the phosphor is coated on the inner wall surface. A tube current of 5 mA, 6 mA, 7 mA, and 8 mA was applied between the pair of electrodes of the formed cold cathode fluorescent tube, and the tube voltage generated for each tube current was measured. The results are shown in Figure 6. (Comparative Example 6) In this comparative example, the electrode material of this comparative example was produced. The electrode material is completely the same as that of the eighth embodiment except that a metal which is substantially composed only of Fe and the remainder is not -39-201013738 and which can be avoided as an impurity is used. Then, in the same manner as in the eighth embodiment, an electrode material obtained by the present comparative example was used to form a pair of thin plate-shaped electrodes for cold cathode fluorescent tubes, and a cold cathode tube Q was formed, which was formed on the inner wall surface. The inside of the glass tube to which the phosphor is not applied has the pair of electrodes described above. Next, with respect to the above-described cold cathode tube Q, the surface composition of the electrode for cold cathode fluorescent tubes and the composition of the inner wall surface of the glass tube were measured by ΕΡΜΑ in the same manner as in the eighth embodiment. The results are shown in Table 8. Subsequently, in the same manner as in the eighth embodiment, using the electrode material obtained in the present comparative example, a pair of thin plate-shaped electrodes for cold cathode fluorescent tubes were fabricated, and a cold cathode fluorescent tube was fabricated, and the cold cathode fluorescent tube was The inside of the glass tube to which the inner wall surface is coated with the phosphor has the pair of electrodes. A tube current of 5 mA, 6 mA, 7 mA, and 8 mA was applied between the pair of electrodes of the formed cold cathode fluorescent tube, and the tube voltage generated for each tube current was measured. The results are shown in Figure 6.

(Table 6) \ Mo (% by mass) Nb (% by mass) Fe (% by mass) Ni (% by mass) Sputtering rate (%) Reference Example 3 - - - 100* 100 Example 8 3.4 1.6 Remaining portion * - 69.1 Comparative Example 5: 100* - - - 83.4 *: Containing unavoidable impurities It is apparent from Table 6 that the electrode material of Example 8 has a smaller sputtering rate than the electrode material of Comparative Example 5 which is substantially composed of Mo. Excellent anti-sputtering properties from -40 to 201013738. The electrode material of the above-described eighth embodiment is composed of an alloy having a content of 3.4% by mass relative to the total amount of Mo, 1.6% by mass of Nb, and the balance being substantially Fe. (Table 7)

Mo (% by mass) Nb Reward %) Fe (% by mass) Ni (% by mass) Tensile strength (N/mm2) Elongation (%) Necking rate (%) Reference Example 3 - - - 100* 361 18.8 6.4 Implementation Example 8 3.4 1.6 Remaining portion * - 502 34.9 59.6 Comparative Example 5 100* - - - 335 2.4 1.6: Containing unavoidable impurities In addition, it is apparent from Table 7 that the electrode material of Example 8 is compared with Comparative Example 5. The tensile strength is large and has excellent strength. Further, as apparent from Table 7, the electrode material of Example 8 was particularly large in elongation and necking ratio as compared with Comparative Example 5, and had excellent workability. \ Mo Replenishment %) Nb (% by mass) Fe (% by mass) Ni (% by mass) Electrode surface Hg Glass tube inner wall Hg Reference Example 3 - - - 100* Yes (87% by mass) Yes (21% by mass) Example 8 3.4 1.6 Remaining part * - - - Comparative Example 5 100* - - - - Comparative Example 6 - - 100* - Yes (2.5 mass%) - Contains unavoidable impurities from Table 8 It is apparent that in the cold cathode Tube M (with embodiment eight-41 - 201013738

In the thin plate-shaped cold cathode fluorescent tube electrode 3), there is no Hg atom on the surface of the electrode 3 and the inner wall surface of the glass tube. Therefore, in the cold cathode tube, the Fe atoms constituting the electrode 3 for the cold cathode fluorescent tube are slightly sputtered, but the surface of the electrode 3 and the inner wall surface of the glass tube are not formed of Fe and Hg. Alloy (amalgam). From this, it is clear that the cold cathode tube crucible does not consume Hg in the glass tube due to the formation of the amalgam, and thus the service life of the cold cathode tube crucible can be prolonged.

On the other hand, it is apparent that in the cold cathode tube Ν (the electrode for the thin-plate cold cathode fluorescent tube having the reference example 3), a relatively total amount of Hg atoms of 87% by mass is present on the surface of the electrode, and the glass tube is A relatively total amount of Hg atoms of 21% by mass is present on the inner wall surface. Therefore, it is apparent that in the cold cathode tube N, Ni atoms constituting the electrode for the cold cathode fluorescent tube are sputtered, and an amalgam composed of Ni and Hg is formed on the surface of the electrode. From this, it is clear that the cold cathode tube N consumes Hg in the glass tube due to the formation of the amalgam, which shortens the service life of the cold cathode tube N. Further, it is apparent that in the cold cathode tube Q (the electrode for the thin-plate cold cathode fluorescent tube of Comparative Example 6), although there is no Hg atom on the inner wall surface of the glass tube, there is a relative total amount on the surface of the electrode. It is 2.5% by mass of Hg atoms. Therefore, it is apparent that in the cold cathode tube Q, Fe atoms constituting the electrode for the cold cathode fluorescent tube are sputtered, and amalgam composed of micro Fe and Hg is formed on the surface of the electrode. It can be clearly seen that the above cold cathode tube Q is eliminated by the formation of amalgam -42 - 201013738

The Hg in the glass tube is consumed, and the service life of the cold cathode tube Q is shortened compared to the cold cathode tube. In addition, it is apparent from Fig. 6 that the electrode 3 for the cold cathode fluorescent tube of the eighth embodiment has a lower content of Mo than the electrode for the cold cathode fluorescent tube of the third example which is substantially composed of Ni. Mass % 'but the tube voltage is small. Further, it is also apparent that the tube voltage when the electrode 3 for a cold cathode fluorescent tube of the eighth embodiment is used is close to the tube voltage when the electrode for a cold cathode fluorescent tube which is substantially composed of Mo of Comparative Example 5 is used. Therefore, it is apparent that the electrode 3 for the cold cathode fluorescent tube of the eighth embodiment has a low tube voltage and is excellent in energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an explanatory view showing an electrode for a cold cathode fluorescent tube and a cold cathode fluorescent tube according to the embodiment. Fig. 2 is a graph showing the electrical resistivity of the cold cathode tubes having the electrodes for the cold cathode fluorescent tubes φ of the first to sixth embodiments. Fig. 3 is a graph showing current-voltage characteristics of a cold cathode tube having an electrode for a cold cathode fluorescent tube of the first embodiment. Fig. 4 is a graph showing the tube voltage ratio of the cold cathode tubes having the electrodes for the cold cathode fluorescent tubes of the first to sixth embodiments. Fig. 5 is a graph showing the service life of the cold cathode fluorescent tubes of the first embodiment and the seventh embodiment. Fig. 6 is a graph showing the tube voltage ratio of the cold cathode fluorescent tube having the electrode for cold cathode fluorescent tubes of the eighth embodiment. -43- 201013738 [Description of main component symbols] 1 : Cold cathode fluorescent tube 2 : Glass tube 3 : Electrode for cold cathode fluorescent tube 4 : Sealing pin 5 : External wire

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Claims (1)

201013738 VII. Patent application scope: 1. An electrode for a cold cathode fluorescent tube, which is characterized in that it is composed of an alloy containing Mo, Fe, and unavoidable impurities in a relative total amount of 0.1 to 30% by mass. 2. The electrode for a cold cathode fluorescent tube according to the first aspect of the invention, wherein the alloy contains Mo 〇A in a range of from 0.1 to 10% by mass relative to the total amount. 3. The cold cathode fluorescing of the first item of claim 1 The electrode for a light pipe, wherein the alloy contains Mo 〇4 in a range of 1.5 to 5.5% by mass relative to the total amount, and the electrode for a cold cathode fluorescent tube according to the first aspect of the patent application, wherein the above alloy contains a relative total amount of 5% by mass. The following Ru. 5. The electrode for cold cathode fluorescent tube according to the first aspect of the invention, wherein the alloy contains Nb in a range of from 1 to 6 mass% relative to the total amount. A cold cathode fluorescent tube comprising: an electrode for a cold cathode fluorescent tube comprising an alloy containing Mo, Fe, and unavoidable impurities in a range of 0.1 to 30% by mass in total. 7. The cold cathode fluorescent tube of claim 6 of the patent application, wherein the above alloy contains M 〇 in a range of 〇.1~1〇% by mass. 8. Cold cathode as in claim 6 The egg light pipe 'where the above alloy contains a relative amount of Mo in the range of 1.5 to 5.5% by mass. 9. The cold cathode fluorescent tube of the sixth aspect of the patent application' wherein the above alloy contains a relative total amount of 5% by mass or less Ru ° 1 〇 · The cold cathode fluorescent tube of claim 6 of the patent scope, wherein -45 - 201013738 The above alloy contains Nb in a range of relatively full amount of ο·1-6 mass%. -46 -