JP2010282770A - Electrode structure, method of manufacturing electrode structure, cold-cathode discharge lamp, lighting device, and image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent intrusion of air into an inner space of a low-pressure discharge lamp when an electrode structure is used for sealing the low-pressure discharge lamp. <P>SOLUTION: The electrode structure 100 is provided with an electrode 101, a sealing wire 102 the one end part of which is connected with the electrode 101, and a glass member 103 so formed as to cover at least a portion of the sealing wire 102. Out of the surface of the sealing wire 102, a nearly intermediate part of the portion covered by the glass member 103 has no oxidized film 105 formed, or, the oxidized film 105 of the maximum thickness of 0.1[μm] or less is formed, and on the side of the sealing wire 102 of the glass member 103, there is formed a diffusion layer 106 of a material of the sealing wire 102. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electrode structure, a method for manufacturing the electrode structure, a cold cathode discharge lamp, an illumination device, and an image display device.

  A sectional view including the tube axis of a conventional cold cathode discharge lamp is shown in FIG. A conventional electrode structure (hereinafter referred to as “electrode structure 1”) includes a cup-shaped electrode 2, a lead wire 3 bonded to the bottom end surface of the electrode 2, and a glass bonded to the outer periphery of the lead wire 3. The lead wire 3 includes an internal lead wire (sealing wire) 3a joined to the glass member 4 and an external lead wire 3b arranged to be exposed to the outside of the glass member 4. The lead wire 3a includes an oxide film 5 at a portion covered with the glass member 4 on the surface thereof (see, for example, Patent Document 1).

JP 2008-130396 A

  In the case of the electrode structure 1, when the oxide film is formed on the surface of the sealing wire 3a, the thickness of the oxide film is 2.8 [μm] to 3.7 [μm], and the internal lead wire 3a is made of a glass member. After covering with the glass member, the thickness of the oxide film 5 covered with the glass member becomes as thin as 1.4 [μm] to 2.5 [μm], but still covered with the glass member 4 of the sealing wire 3a. The oxide film 5 remains on the entire portion that can be confirmed.

  However, when the low pressure discharge lamp is sealed using the electrode structure 1 as a result of examination by the inventors, an external space is formed between the sealing wire 3a and the glass member 4 into the internal space of the low pressure discharge lamp. It was found that air can easily enter from the space.

  Accordingly, the electrode structure and the method for manufacturing the electrode structure according to the present invention are intended to prevent air from flowing into the internal space of the low-pressure discharge lamp when used for sealing the low-pressure discharge lamp. .

  Another object of the low-pressure discharge lamp according to the present invention is to prevent air from flowing into the internal space of the low-pressure discharge lamp.

  Furthermore, it is an object of the illumination device and the image display device according to the present invention to prevent air from flowing into the internal space of the low-pressure discharge lamp provided therein.

  In order to solve the above problems, an electrode structure according to the present invention is formed to cover an electrode, a sealing wire having one end connected to the electrode, and at least a part of the sealing wire. An electrode structure having a glass member, wherein an oxide film is not formed on a substantially middle portion of the surface of the sealing wire covered with the glass member, or the maximum thickness is An oxide film of 0.1 [μm] or less is formed, and a diffusion layer of the material of the sealing wire is formed on the sealing wire side of the glass member.

  The electrode structure according to the present invention includes an electrode, a sealing wire having one end connected to the electrode, and a glass member formed so as to cover at least a part of the sealing wire. An oxide film having a maximum thickness of 0.1 [μm] or less is not formed on a portion of the surface of the sealing wire that is covered with the glass member. And a diffusion layer of a material of the sealing wire is formed on the sealing wire side of the glass member.

The electrode structure according to the present invention includes an electrode, a sealing wire having one end connected to the electrode, and a glass member formed so as to cover at least a part of the sealing wire. A substantially intermediate portion of a portion of the surface of the sealing wire covered with the glass member is formed with an oxide film having a maximum thickness of 0.1 [μm] or less. The film contains at least one of Fe ₃ O ₄ and FeO, and a diffusion layer of the material of the sealing wire is formed on the sealing wire side of the glass member. Features.

Furthermore, the electrode structure according to the present invention includes an electrode, a sealing wire having one end connected to the electrode, and a glass member formed so as to cover at least a part of the sealing wire. An oxide film having a maximum thickness of 0.1 [μm] or less is formed on a portion of the surface of the sealing wire that is covered with the glass member. One or more of Fe ₃ O ₄ and FeO are included, and a diffusion layer of the sealing wire material is formed on the sealing wire side of the glass member. .

  In the electrode structure according to the present invention, it is preferable that the minimum thickness of the diffusion layer is 8 [μm] or more, and the maximum thickness of the diffusion layer is 30 [μm] or less.

  Moreover, the electrode structure according to the present invention includes an iron in the range of 48 [wt%] to 54 [wt%] and nickel in a range of 46 [wt%] to 52 [wt%]. Are preferably included.

In the electrode structure according to the present invention, the glass member has an oxide conversion of SiO ₂ of 60 [wt%] to 75 [wt]% and Al ₂ O ₃ of 1 [wt%] to 5 [wt]. %], Li ₂ O is 0 [wt%] to 5 [wt%], K ₂ O is 3 [wt%] to 11 [wt%], and Na ₂ O is 3 [wt%] to 12 [wt%]. , CaO 0 [wt%] to 9 [wt%], MgO 0 [wt%] to 9 [wt%], SrO 0 [wt%] to 12 [wt%], BaO 0 [wt%] It is preferable to have a composition of ˜12 [wt%].

  An electrode structure according to the present invention comprises an electrode, a sealing wire having one end connected to the electrode, and a glass member formed to cover at least a part of the sealing wire. In the surface of the sealing wire, an oxide film formed in a substantially middle portion of the portion covered with the glass member is diffused or oxidized with a maximum thickness of 0.1 [μm] or less. The diffusion layer of the material of the sealing wire is formed on the sealing wire side of the glass member by diffusing so that the film remains.

  The method for manufacturing an electrode structure according to the present invention includes an electrode, a sealing wire having one end connected to the electrode, and a glass member formed so as to cover at least a part of the sealing wire. A method for manufacturing an electrode structure, the step of connecting the electrode and one end of the sealing wire, the step of forming an oxide film on the surface of the sealing wire, and at least one of the sealing wires The glass member is coated on the surface, and all of the oxide film formed in a substantially middle portion of the surface of the sealing wire covered with the glass member is diffused, or the maximum thickness is 0.1 [ [mu] m], and a step of diffusing so that an oxide film of less than [mu] m remains.

  The low-pressure discharge lamp according to the present invention includes a glass bulb and an electrode structure provided at at least one end of the glass bulb.

  An illumination device according to the present invention includes the low-pressure discharge lamp.

  The image display device according to the present invention includes the illumination device.

  The electrode structure and the method for manufacturing the electrode structure according to the present invention can prevent air from flowing into the internal space of the low-pressure discharge lamp when used for sealing the low-pressure discharge lamp.

  Moreover, the low-pressure discharge lamp according to the present invention can prevent air from flowing into the internal space of the low-pressure discharge lamp.

  Furthermore, the illumination device and the image display device according to the present invention can prevent air from flowing into the internal space of the low-pressure discharge lamp provided therein.

(A) Sectional drawing containing the central axis of the longitudinal direction of the electrode structure which concerns on the 1st Embodiment of this invention, (b) Of the surface of the sealing line, the substantially intermediate part of the part coat | covered with the glass member FIG. 1 (a) shows an enlarged cross-sectional view of the main part of the portion A in FIG. 1 (a) when the oxide film is completely diffused, and (c) the maximum thickness at the substantially middle portion of the surface covered with the glass member. Is an enlarged cross-sectional view of a main part of portion A in FIG. 1A when an oxide film having a thickness of 0.1 [μm] or less is formed. (A) Sectional drawing including the central axis of the longitudinal direction of the modification of the electrode structure which concerns on the 1st Embodiment of this invention, (b) Abbreviation of the part coat | covered with the glass member among the surfaces of the sealing wire. 2B is an enlarged cross-sectional view of the main part of the portion B in FIG. 2A when the intermediate oxide film is all diffused, and FIG. 2B is an enlarged cross-sectional view of the main part of portion B in FIG. 2A when an oxide film having a maximum thickness of 0.1 [μm] or less is formed on (A) The conceptual diagram of the connection process in the manufacturing process of the electrode structure which concerns on the 1st Embodiment of this invention, (b) The conceptual diagram of an oxidation process, (c) The conceptual diagram of an insertion process, (d) Similarly Conceptual diagram of sealing process, (e) Conceptual diagram of reduction process Sectional drawing containing the tube axis | shaft of the low voltage | pressure discharge lamp which concerns on the 3rd Embodiment of this invention. Sectional drawing containing the tube axis | shaft of the low pressure discharge lamp which concerns on the 4th Embodiment of this invention. (A) Sectional drawing including the central axis of the longitudinal direction of the electrode structure which concerns on the 5th Embodiment of this invention, (b) Sectional drawing including the central axis of the longitudinal direction of the modification of an electrode structure similarly (A) Cross-sectional view including the tube axis of the low-pressure discharge lamp according to the sixth embodiment of the present invention, (b) Cross-sectional view including the tube axis of the modified example of the low-pressure discharge lamp. The disassembled perspective view of the illuminating device based on the 7th Embodiment of this invention. The partially cutaway perspective view of the illuminating device which concerns on the 8th Embodiment of this invention. (A) Front view of illuminating device according to ninth embodiment of the present invention, (b) Cross-sectional view taken along line CC ′ of FIG. 10 (a) The perspective view of the image display apparatus which concerns on the 10th Embodiment of this invention. (A) The principal part enlarged front view of the modification of the low pressure discharge lamp which concerns on the 2nd Embodiment of this invention, (b) The principal part expanded sectional view which also contains a pipe axis. Sectional drawing including the central axis of the longitudinal direction of the conventional electrode structure

(First embodiment)
The cross-sectional view including a longitudinal central axis X ₁₀₀ of the electrode structure according to a first embodiment of the present invention shown in FIG. 1 (a). An electrode structure 100 according to the first embodiment of the present invention (hereinafter referred to as “electrode structure 100”) includes an electrode 101, a sealing wire 102 having one end connected to the electrode 101, and a sealing wire. And a glass member 103 formed so as to cover at least a part of 102.

  The electrode 101 has, for example, a bottomed cylindrical shape, and has an inner diameter of 2.4 [mm], an outer diameter of 2.7 [mm], a bottom thickness of 0.2 [mm], and a total length of 8.2 [mm]. mm] and made of nickel (Ni). Note that the material of the electrode 101 is not limited to nickel, and any one or any one or more alloys of niobium (Nb), molybdenum (Mo), tantalum (Ta), and tungsten (W) may be used. The electrode 101 is connected to one end surface of the sealing wire 102 at a substantially central portion of the outer bottom surface. The electrode 101 and the sealing wire 102 may be directly connected or may be connected via a brazing material (not shown) made of, for example, nickel foil or Kovar foil. As a method for connecting the electrode 101 and the sealing wire 102, laser welding, resistance welding, or the like can be used.

  The sealing wire 102 has a wire diameter of 0.8 [mm] and is made of an alloy of iron and nickel. It is preferable to use a material that matches the thermal expansion coefficient of the glass used as the material of the glass member 103 for the sealing wire 102.

Note that the sealing wire 102 preferably contains iron in the range of 48 [wt%] to 54 [wt%] and nickel in the range of 46 [wt%] to 52 [wt%]. In this case, when the glass member 103 is soft glass having a coefficient of thermal expansion of 90 × 10 ⁻⁷ [K ⁻¹ ] or more and 100 × 10 ⁻⁷ [K ⁻¹ ] or less, the sealing wire 102 and the glass member 103 are used. The sealing property can be improved.

  An external lead wire 104 is preferably connected to the other end of the sealing wire 102. In this case, when the electrode structure 100 is used for a low-pressure discharge lamp, the stress applied to the external lead wire 104 is absorbed by the connecting portion between the sealing wire 102 and the external lead, so that the stress transmitted to the glass member 103 is relieved. be able to. The external lead wire 104 has a wire diameter of, for example, 0.6 [mm] and is made of nickel. Note that the material of the external lead wire 104 is not limited to nickel, and for example, an alloy of nickel and manganese, a dumet wire, or the like may be used. Further, the surface of the external lead wire 104 may be covered with solder in order to prevent the external lead wire 104 from being oxidized.

  The glass member 103 has a substantially spherical shape, covers at least a part of the sealing wire 102 along its substantially central axis, and is made of soft glass such as lead-free glass or soda glass. The glass member 103 is preferably made of the same material as the glass bulb to be sealed or a material having the same or similar thermal expansion coefficient as the glass bulb 101 from the viewpoint of sealing properties.

  The oxide film 105 is not formed on the substantially intermediate portion of the surface of the sealing wire 102 covered with the glass member 103, or the oxide film 105 having a maximum thickness of 0.1 [μm] or less is formed. A diffusion layer 106 made of the material of the sealing wire 102 is formed on the side of the sealing wire 102 of the glass member 103. FIG. 1 is an enlarged cross-sectional view of the main part of the portion A in FIG. 1A when the oxide film 105 in the substantially intermediate portion of the surface covered with the glass member 103 is diffused. FIG. 1B illustrates a case where an oxide film 105 having a maximum thickness of 0.1 [μm] or less is formed in a substantially middle portion of the surface of the sealing wire 102 covered with the glass member 103. The principal part expanded sectional view of A part of (a) is shown in FIG.1 (c), respectively.

  The structure of the substantially intermediate portion of the surface of the sealing wire 102 covered with the glass member 103 is as shown in FIGS. 1B and 1C, which is formed on the surface of the sealing wire 102 in advance. As the components of the oxide film 105 diffused into the glass member 103, the oxide film 105 in the substantially intermediate portion of the surface covered with the glass member 103 in the surface of the sealing wire 102 can hardly be confirmed. It is because it becomes thin to the extent. In other words, an oxide film of a sealing wire material is formed on the surface of the sealing wire 102 in advance, and the material of the sealing wire 102 in the oxide film (when the sealing wire is an alloy of iron and nickel). In this case, iron is diffused into the glass member 103, so that the material of the sealing wire on the sealing wire 102 side of the glass member 103 (in the case where the sealing wire is an alloy of iron and nickel, iron) The diffusion layer is formed so that the oxide film 105 at the substantially middle portion of the portion covered with the glass member 103 is thin enough to be hardly confirmed.

  Thereby, when the sealing wire 102 and the glass member 103 are in close contact with each other, when the electrode structure 100 is used to seal the low-pressure discharge lamp, air easily flows into the internal space of the low-pressure discharge lamp. Can be prevented.

  On the other hand, when the oxide film remains to the extent that it can be confirmed, a void is easily formed in the oxide film, and after the lamp is formed, the internal space of the lamp and the external space are easily connected through the void. Air is easy to flow into.

Of the surface of the sealing wire 102, a substantially intermediate portion of the portion covered with the glass member 103 is formed on the oxide film 105 when the oxide film 105 having a maximum thickness of 0.1 [μm] or less is formed. Preferably, at least one of Fe ₃ O ₄ and FeO is contained. In this case, the tensile strength between the sealing wire 102 and the glass member 103 can be improved. Furthermore, it is more preferable that the oxide film 105 contains Fe ₃ O ₄ . In this case, the tensile strength between the sealing wire 102 and the glass member 103 can be further improved.

  As shown in FIG. 1A, an oxide film (hereinafter referred to as “thick oxide film 105a”) that can be confirmed at the end of the surface of the sealing wire 102 covered with the glass member. .) May be formed.

  The area of the region where the thick oxide film 105a is formed is in the range of 5% to 40% of the surface area of the portion covered by the glass member 103 out of the surface area of the sealing wire 102. It is preferable that In this case, when a load is applied to the external lead wire 104, the stress is absorbed by the peeling of the thick oxide film 105a at the end, so that leakage due to a sudden impact on the external lead wire 104 can be prevented.

  More preferably, the thick oxide film 105a is annular, and the length in the longitudinal direction of the region where the thick oxide film 105a is formed is covered by the glass member 103 of the surface of the sealing wire 102. It is preferable that it is in the range of 0 [%] to 40 [%] of the length of the portion. In this case, by reducing the area where the thick oxide film 105a is formed, air can be easily prevented from flowing into the internal space of the low-pressure discharge lamp.

FIG. 2A is a cross-sectional view including the central axis X ₁₀₇ in the longitudinal direction of a modification of the electrode structure according to the first embodiment of the present invention, and the glass member 103 is covered on the surface of the sealing wire 102. FIG. 2B is an enlarged cross-sectional view of the main part of the portion B of FIG. 2A when the oxide film in the substantially intermediate portion of the formed portion is diffused. FIG. 2 is an enlarged cross-sectional view of the main part of the portion B in FIG. 2A when the oxide film 105 having a maximum thickness of 0.1 [μm] or less is formed in a substantially middle portion of the portion covered with the member 103. Each is shown in (c).

  As shown in FIGS. 2A to 2C, a modified example of the electrode structure according to the first embodiment of the present invention (hereinafter referred to as “electrode structure 107”) includes an electrode 101 and one end portion. Is an electrode structure 107 having a sealing wire 102 connected to the electrode 101 and a glass member 103 formed so as to cover at least a part of the sealing wire 102, Of these, the oxide film 105 is not formed on the portion covered with the glass member 103, or the oxide film 105 having a maximum thickness of 0.1 [μm] or less is formed. A diffusion layer 106 made of the material of the sealing wire 102 is formed on the wire 102 side. In this case, since the oxide film formed in the oxidation process can sufficiently diffuse into the glass, the sealing wire 102 and the glass member 103 can be firmly adhered to each other, so that air flows into the internal space of the low-pressure discharge lamp. Can be sufficiently prevented.

(Experiment)
The inventors have found that the oxide film 105 is not formed on the surface of the sealing wire 102 at the substantially middle portion of the portion covered with the glass member 103, or the maximum thickness is 0.1 [μm] or less. An oxide film 105 is formed, and a diffusion layer 106 made of the material of the sealing wire 102 is formed on the sealing wire 102 side of the glass member, so that the electrode structure 100 is used to seal the low-pressure discharge lamp. In order to confirm that it is possible to prevent air from flowing into the internal space of the low-pressure discharge lamp when performing the above, a leak test was performed.

  The following four types of samples were used in the experiment. A low-pressure discharge lamp manufactured using a structure substantially the same as that of the electrode structure 100 was taken as Example 1. In addition, the example having the substantially same configuration as that of Example 1 was used in Example 2, except that the same structure as that of the electrode structure 107 was used. Furthermore, on the surface of the sealing wire, an electrode structure in which an oxide film that can be confirmed (the maximum thickness is thicker than 0.1 [μm]) is formed in a substantially middle portion of the portion covered with the glass member. Except for the point of using, the comparative example 1 is substantially the same as the example 100. Furthermore, on the surface of the sealing wire, no oxide film is formed on the portion covered with the glass member, and no diffusion layer of the sealing wire material is formed on the sealing wire side of the glass member. Except for the point of using the electrode structure, the one having substantially the same configuration as that of Example 1 was used as Comparative Example 2.

  In the experiment, the sample lamp was held horizontally on a horizontal table, the external lead wire was taken out of the table, and a weight of 1800 [g] was suspended on the external lead wire for 10 seconds after repeating 5 times. The leak was confirmed in the lamp start test. The criterion for checking the leak is “○” when the lamp is lit within 100 [V] of the starting voltage before the test, and “X” when the lamp is lit above 100 [V] or not lit. did. This is because when air flows in, impure gases such as nitrogen and oxygen flow into the lamp, the pressure inside the lamp increases, and the starting voltage of the lamp increases. Further, in Examples 1 and 2, the presence or absence of inflow of air into the internal space of the lamp was also confirmed for the 2800 [g] weight by the same method. In each experimental sample, the number of “x” among the ten samples was determined (that is, the number of inflows of air in the internal space of the lamp).

  The experimental results are shown in Table 1.

  As shown in Table 1, in Examples 1 and 2, when a weight of 1800 [g] was suspended, air did not flow into the internal space of the lamp. On the other hand, in Comparative Examples 1 and 2, air flows into the internal spaces of several lamps.

  In the case of the comparative example 1, since an oxide film of a level that can be confirmed is formed in a substantially middle portion of the surface of the sealing wire covered with the glass member, the internal space of the lamp is passed through the oxide film portion. It is thought that air is flowing in.

  In the case of Comparative Example 2, an oxide film is not formed on the surface of the sealing wire covered with the glass member, and the diffusion layer of the sealing wire material is formed on the sealing wire side of the glass member. This is probably because the adhesion between the sealing wire and the glass member is weak, and there is a portion where the glass member is peeled off from the sealing wire.

  On the other hand, in Examples 1 and 2, an oxide film is not formed in a substantially middle portion of the surface of the sealing wire covered with the glass member, or the maximum thickness is 0.1 [μm]. The following oxide film is formed, and since a diffusion layer of the sealing wire material is formed on the sealing wire side of the glass member, the gap between the sealing wire and the glass member is between Comparative Examples 1 and 2. It is considered that air is not inflowing into the internal space of the lamp.

  Furthermore, in the second embodiment, when a weight of 2800 [g] is suspended, the inflow of air into the internal space of the lamp is less likely to occur than in the first embodiment. This is because the adhesion distance between the sealing wire 102 and the glass member 103 can be secured long, and the sealing wire 102 and the glass member 103 can be more firmly adhered to each other.

  A method for manufacturing the electrode structure 100 will be described below with reference to FIG.

The manufacturing method of the electrode structure 100 includes an electrode, an electrode structure including a sealing wire having one end connected to the electrode, and a glass member formed so as to cover at least a part of the sealing wire. A method of connecting the electrode and one end of the sealing wire (connecting step), a step of forming an oxide film on the surface of the sealing wire (oxide film forming step), and sealing The glass member is coated on at least a part of the wire, and the oxide film formed in the substantially intermediate portion of the surface of the sealing wire covered by the glass member is all diffused into the glass member, or the maximum thickness is 0 And a step of diffusing so as to leave an oxide film of 1 [μm] or less (sealing step).
1. Connection Step First, as shown in FIG. 3A, the electrode 101 and one end of the sealing wire 102 are connected. Specifically, for example, one end surface of the sealing wire 102 is brought into contact with the outer bottom surface of the electrode 101 and is connected by resistance welding. The method for connecting the electrode 101 and the sealing wire 102 is not limited to resistance welding, and laser welding or the like may be used.
2. Oxide Film Formation Step Subsequently, as shown in FIG. 3B, an oxide film 105 is formed on the surface of the sealing wire 102. Specifically, for example, the surface of the sealing wire 102 is oxidized by heating the surface of the sealing wire 102 with a gas burner 108 or the like. The oxidation method is not limited to the gas burner 108, and for example, a heating furnace or the like may be used.
3. Sealing Step Next, as shown in FIG. 3C, the external lead wire 104 is inserted into the hollow portion of the cylindrical glass tube 109 from the end opposite to the side to which the sealing wire 102 is connected. . Then, the external lead wire 104 is inserted into a fixing hole 110a provided on one end surface of the jig 110 and fixed.

  Subsequently, as shown in FIG. 3D, in a state where the sealing wire 102 is inserted and fixed in the fixing hole 110a of the jig 110, it is placed in the electric furnace 111, for example, about 750 [° C.] to 800. Heat at [° C.] for about 20 minutes. Thereby, the glass member 103 formed so as to cover at least a part of the sealing wire 102 is formed by melting the glass tube 109. At this time, the oxide film 105 formed in the substantially middle part of the surface of the sealing wire 102 covered with the glass member 103 is all diffused into the glass member 103, or the maximum thickness is 0.1 [μm]. The following oxide film is diffused so as to remain, and a diffusion layer 106 made of the material of the sealing wire 102 is formed on the sealing wire 102 side of the glass member 103.

  The electrode structure 100 is completed through the above steps.

In addition, when manufacturing the electrode structure 107, it can manufacture by heating at 800 [degreeC] -950 [degreeC] for about 30 minutes. As a result, the oxide film 105 formed on the portion of the surface of the sealing wire 102 covered with the glass member 103 is all diffused into the glass member 103 or the maximum thickness is 0.1 [μm] or less. A diffusion layer 106 made of the material of the sealing wire 102 is formed on the side of the sealing wire 102 of the glass member 103.
4). Reduction process In addition, the surface of the electrode 101 or the external lead wire may be oxidized in the oxide film forming process or the sealing process. In particular, when the electrode 101 is oxidized, it is difficult for electrons to jump out of the electrode 101 and the electrode 101 is easily sputtered. Therefore, it is preferable to provide a reduction step after the sealing step.

  As shown in FIG. 3 (e), the electrode structure 100 is placed in a reduction furnace 112 and heated at 650 [° C.] to 750 [° C.] for about 15 minutes in a hydrogen atmosphere, whereby the sealing wire 102 The portions not covered with the glass member 103 and the surfaces of the electrodes 101 and the external lead wires 104 are reduced.

  As described above, according to the configuration of the electrode structures 100 and 107 according to the first embodiment of the present invention, air flows into the internal space of the low-pressure discharge lamp when used for sealing the low-pressure discharge lamp. Can be prevented.

  The minimum thickness of the diffusion layer 106 is preferably 8 [μm] or more, and the maximum thickness of the diffusion layer 106 is preferably 30 [μm] or less. In this case, it is possible to prevent the occurrence of cracks in the diffusion layer 106 and further prevent air from flowing into the internal space of the low-pressure discharge lamp. Furthermore, the minimum thickness of the diffusion layer 106 is 16 [μm] or more, and the maximum thickness of the diffusion layer 106 is more preferably 30 [μm] or less. The minimum thickness and the maximum thickness of the diffusion layer 106 can be obtained, for example, from the element diffusion distance by line element analysis using SEM-EDS.

(Second Embodiment)
The cross-sectional view including the tube axis X ₂₀₀ of the low-pressure discharge lamp according to a second embodiment of the present invention shown in FIG. The low-pressure discharge lamp (hereinafter referred to as “lamp 200”) according to the second embodiment of the present invention is a cold cathode fluorescent lamp, and is provided at at least one end of the glass bulb 201 and the glass bulb 201. Electrode structure 100.

The glass bulb 201 is made of soft glass such as lead-free glass or soda glass, for example, has a straight tubular shape, and has a substantially annular cross section cut perpendicular to the tube axis. Specifically, for example, the outer diameter is 4 [mm], the inner diameter is 3 [mm], and the total length is 1000 [mm]. The soft glass is, for example, a glass having a thermal expansion coefficient of 90 × 10 ⁻⁷ [K ⁻¹ ] or more and 100 × 10 ⁻⁷ [K ⁻¹ ] or less.

  Inside the glass bulb 201, for example, 3 [mg] mercury is sealed, and a rare gas such as argon or neon is sealed at a predetermined sealing pressure, for example, 40 [Torr]. In addition, as said noble gas, the mixed gas of neon and argon is used by the ratio of Ar = 10 [mol%] and Ne = 90 [mol%], for example.

A phosphor layer 202 is formed on the inner surface of the glass bulb 201. The phosphor layer 202 includes, for example, a red phosphor (Y ₂ O ₃ : Eu ²⁺ ), a green phosphor (LaPO ₄ : Ce ³⁺ , Tb ³⁺ ), and a blue phosphor (BaMg ₂ Al ₁₆ O ₂₇ : Eu ^{2). +} ) And a rare earth phosphor.

Further, between the inner surface of the glass bulb 201 and the phosphor layer 202, for example, yttrium oxide (Y ₂ O ₃ ), silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), zinc oxide (ZnO), oxide A protective film (not shown) of a metal oxide such as titanium (TiO ₂ ) may be provided.

  As described above, according to the structure of the low-pressure discharge lamp 200 according to the second embodiment of the present invention, air can be prevented from flowing into the internal space of the low-pressure discharge lamp 200.

  Note that not only the electrode structure 100 but also the electrode structure 107 may be used. In this case, since the sealing wire 102 and the glass member 103 can be firmly adhered, it is possible to sufficiently prevent air from flowing into the internal space of the low-pressure discharge lamp.

  Furthermore, a cesium compound may adhere to the inner surface of the electrode 101. In this case, the lamp voltage of the lamp 200 can be reduced, and the dark start characteristics can be improved.

(Third embodiment)
FIG. 5 shows a cross-sectional view including the tube axis X ₃₀₀ of the cold cathode discharge lamp according to the third embodiment of the present invention. A cold cathode discharge lamp (hereinafter referred to as “lamp 300”) according to the third embodiment of the present invention is an internal / external electrode type cold cathode fluorescent lamp.

  The lamp 300 has an external electrode 301 on the outer surface of one end thereof, and has substantially the same configuration as the lamp 200 except for the configuration associated therewith. Therefore, the external electrode 301 and the configuration accompanying it will be described in detail, and description of other points will be omitted.

  The external electrode 301 is made of, for example, solder and is formed so as to cover the outer surface of one end portion of the glass bulb 201.

  The external electrode 301 may be formed by applying silver paste to the entire circumference of the electrode forming portion of the glass bulb 201, or may be formed by covering a metal cap on one end of the glass bulb 201. Good. Further, an aluminum metal foil may be adhered so as to cover the outer peripheral surface of one end of the glass bulb 201 with a conductive adhesive (not shown) in which a metal powder is mixed with a silicone resin. In addition, in a conductive adhesive, you may use a fluororesin, a polyimide resin, or an epoxy resin instead of a silicone resin.

Further, a protective film (not shown) of, for example, yttrium oxide (Y ₂ O ₃ ) may be provided on the inner surface of the glass bulb 201 and in the region where the external electrode 301 is formed. By providing the protective film, it is possible to prevent glass scraping and pinholes caused by mercury ions bombarding that portion of the glass bulb 201.

The protective film may be made of metal oxide such as silica (SiO ₂ ), alumina (Al ₂ O ₃ ), zinc oxide (ZnO), titania (TiO ₂ ), for example, instead of yttrium oxide. In particular, when the protective film is formed of yttrium oxide or silica, mercury hardly adheres to the protective film, and mercury consumption is low.

  However, the protective film is not an essential component in the present invention and may not be formed at all, or may be formed over the entire inner surface of the glass bulb 201.

  One end of the glass bulb 201 may be sealed by heating and melting one end of the glass bulb 201 without using a glass member.

  As described above, according to the configuration related to the low-pressure discharge lamp 300 according to the third embodiment of the present invention, air can be prevented from flowing into the internal space of the low-pressure discharge lamp 300.

  Note that not only the electrode structure 100 but also the electrode structure 107 may be used. In this case, since the sealing wire 102 and the glass member 103 can be firmly adhered, it is possible to sufficiently prevent air from flowing into the internal space of the low-pressure discharge lamp.

(Fourth embodiment)
FIG. 6A shows a cross-sectional view including the longitudinal central axis X ₄₀₀ of the electrode structure according to the fourth embodiment of the present invention. An electrode structure according to the sixth embodiment of the present invention (hereinafter referred to as “electrode structure 400”) includes an electrode 401, a sealing wire 402 having one end connected to the electrode 401, and a sealing wire 402. And a glass member 403 formed so as to cover at least a part thereof.

  The electrode 401 is a filament coil made of tungsten, for example. The electrode 401 has an emitter (not shown) attached to its winding portion. For the emitter, for example, (Ba, Sr, Ca) O or the like can be used. The electrode 401 is not limited to a filament coil made of tungsten, but may be a filament coil made of rhenium tungsten. In this case, the strength when the electrode 401 is heated by lighting a lamp or the like can be improved.

  The electrode 401 is supported by a pair of sealing wires 402 at both ends.

  The sealing wire 402 is a pair and has substantially the same configuration as the sealing wire 102 except that both ends of the electrode 401 are supported.

  At least a part of the pair of sealing wires 402 is covered with a glass member 403. The glass member 403 has substantially the same configuration as the glass member 103 except that the glass member 403 covers the sealing wire 402.

  As described above, according to the configuration of the electrode structure 400 according to the fourth embodiment of the present invention, when used for sealing a low-pressure discharge lamp, air is prevented from flowing into the internal space of the low-pressure discharge lamp. can do.

Note that the electrode structure shown in FIG. 6B (hereinafter referred to as “electrode structure 404”) may be used. In the electrode structure 404, the electrode 405 has a double spiral structure with the central axis _X404 in the longitudinal direction of the electrode structure as a turning axis. In this case, the diameter of the lamp can be easily reduced as compared with the electrode structure 400. The sealing wire 406 is linear and has substantially the same configuration as the lead wire 402 except for the shape.

  Further, as shown in FIG. 6B, the electrode 405 and the sealing wire 406 are preferably connected via a connecting member 407. In this case, the electrode 405 and the sealing wire 406 can be more reliably connected. The connection member 407 is made of nickel, for example.

  Furthermore, it is preferable to cover the periphery of the electrode 405 with a sleeve 408. In this case, scattering of the emitter from the electrode 405 can be suppressed. The sleeve 408 is made of nickel, for example, and is connected to one connection member by welding. Note that the material of the sleeve 408 is not limited to nickel, and, for example, molybdenum, tantalum, niobium, tungsten, or the like can be used.

  In the electrode structures 400 and 404 shown in FIGS. 6A and 6B, a thick oxide film 105a is formed at the end of the surface of the sealing wires 402 and 406 covered with the glass member. However, the electrode structure 107 may not be formed with the thick oxide film 105a. In this case, as with the electrode structure 107, the sealing wires 402 and 406 and the glass member 403 can be firmly adhered, so that when used for sealing the low-pressure discharge lamp, the internal space of the low-pressure discharge lamp It is possible to sufficiently prevent the air from flowing in.

(Fifth embodiment)
The cross-sectional view including the tube axis X ₅₀₀ of the low-pressure discharge lamp according to a fifth embodiment of the present invention shown in Figure 7 (a). The low-pressure discharge lamp (hereinafter referred to as “lamp 500”) according to the fifth embodiment of the present invention is a hot cathode fluorescent lamp, and includes the electrode structure 400 according to the fourth embodiment of the present invention. Except for this point, it has substantially the same configuration as the lamp 300.

  As described above, according to the configuration of the low-pressure discharge lamp 500 according to the fifth embodiment of the present invention, air can be prevented from flowing into the internal space of the low-pressure discharge lamp 500.

  As shown in FIG. 7B, a low-pressure discharge lamp 501 (hereinafter referred to as “lamp 501”) provided with an electrode structure 404 may be used. In this case, the glass bulb 201 can be reduced in diameter.

(Sixth embodiment)
FIG. 8 shows an exploded perspective view of a lighting apparatus according to the sixth embodiment of the present invention. An illuminating device (hereinafter referred to as “illuminating device 600”) according to a sixth embodiment of the present invention is a direct-type backlight unit, and has a rectangular parallelepiped casing 601 having one surface opened, and the casing. A plurality of lamps 200 housed in the body 601, a pair of sockets 602 for electrically connecting the lamps 200 to a lighting circuit (not shown), and an optical sheet 603 covering an opening of the housing 601. With. The lamp 200 is a low-pressure discharge lamp 200 according to the second embodiment of the present invention. Note that not only the lamp 200 but also the lamp 300, the lamp 500, or the lamp 501 can be used.

  The housing 601 is made of, for example, polyethylene terephthalate (PET) resin, and a reflective surface 604 is formed by depositing a metal such as silver on the inner surface thereof. In addition, as a material of the housing | casing 601, you may comprise by metal materials, such as materials other than resin, for example, aluminum, a cold rolled material (for example, SPCC). Further, as the reflection surface 604 on the inner surface, other than the metal vapor-deposited film, for example, a reflection sheet whose reflectance is increased by adding calcium carbonate, titanium dioxide or the like to polyethylene terephthalate (PET) resin is used. May be.

  Inside the housing 601, a socket 602, an insulator 605, and a cover 606 are disposed. Specifically, the sockets 602 are provided at predetermined intervals in the lateral direction (vertical direction) of the housing 601 corresponding to the arrangement of the lamps 200. The socket 602 is obtained by processing a plate material made of stainless steel or phosphor bronze, for example, and has a fitting portion 602a into which the external lead wire 104a is fitted. Then, the external lead wire 104a is fitted by being elastically deformed so as to expand the fitting portion 602a. As a result, the external lead wire 104a fitted in the fitting part 602a is pressed by the restoring force of the fitting part 602a and is difficult to come off. Thereby, the external lead wire 104a can be easily fitted into the fitting portion 602a, but can be made difficult to come off.

  The socket 602 is covered with an insulator 605 so as not to short-circuit between adjacent sockets 602. The insulator 605 is made of, for example, polyethylene terephthalate (PET) resin. Note that the insulator 605 is not limited to the above structure. Since the socket 602 is in the vicinity of an electrode that becomes relatively hot during operation of the lamp 200, the insulator 605 is preferably made of a heat resistant material. As a material for the heat-resistant insulator 605, for example, polycarbonate (PC) resin, silicon rubber, or the like can be used.

  A lamp holder 607 may be provided inside the housing 601 at a place where necessary. The lamp holder 607 that fixes the position of the lamp 200 inside the housing 601 is, for example, polycarbonate (PC) resin, and has a shape that follows the outer shape of the lamp 200. The “location as necessary” means that the deflection of the lamp 200 is caused when the lamp 200 has a long length exceeding, for example, 600 [mm], as in the vicinity of the central portion of the lamp 200 in the longitudinal direction. It is a place necessary to eliminate.

  The cover 606 divides the socket 602 from the space inside the housing 601 and is made of, for example, polycarbonate (PC) resin. By reducing the brightness, a decrease in luminance at the end of the lamp 200 can be reduced.

  The opening of the housing 601 is covered with a light-transmitting optical sheet 603 and is sealed so that foreign matters such as dust and dust do not enter inside. The optical sheet 603 is formed by laminating a diffusion plate 608, a diffusion sheet 609, and a lens sheet 610.

  The diffusion plate 608 is a plate-like body made of, for example, polymethyl methacrylate (PMMA) resin, and is disposed so as to close the opening of the housing 601. The diffusion sheet 609 is made of, for example, a polyester resin. The lens sheet 610 is, for example, a laminate of an acrylic resin and a polyester resin. These optical sheets 603 are arranged so as to be sequentially superimposed on the diffusion plate 608.

  As described above, according to the configuration of the illumination device 600 according to the sixth embodiment of the present invention, it is possible to prevent air from flowing into the internal space of the low-pressure discharge lamps 200, 300, 500, 501 provided therein. it can.

(Seventh embodiment)
FIG. 9 shows a partially cutaway perspective view of a lighting apparatus according to a seventh embodiment of the present invention. An illuminating device according to the seventh embodiment of the present invention (hereinafter referred to as “illuminating device 700”) is an edge light type backlight unit, which includes a reflector 701, a lamp 200, a socket (not shown), A light guide plate 702, a diffusion sheet 703, and a prism sheet 704 are provided.

  The reflection plate 701 is disposed so as to surround the periphery of the light guide plate 702 except for the liquid crystal panel side (arrow Q), and the side surface covering the bottom surface portion 701a covering the bottom surface and the side surface excluding the side where the lamp 200 is disposed. Part 701b and a curved lamp side surface part 701c covering the periphery of the lamp 200, and the light emitted from the lamp 200 is reflected from the light guide plate 702 to the liquid crystal panel (not shown) side (arrow Q). Let Further, the reflection plate 701 is made of, for example, a film-like PET deposited with silver or a metal foil such as aluminum laminated.

  The lamp 200 is a low-pressure discharge lamp 200 according to the second embodiment of the present invention. Note that not only the lamp 200 but also the lamp 300, the lamp 500, or the lamp 501 can be used.

  The socket has substantially the same configuration as the socket 602 used in the lighting device 600 according to the sixth embodiment of the present invention. In FIG. 9, the end of the lamp 200 is omitted for convenience of illustration.

  The light guide plate 702 is for guiding the light reflected by the reflection plate 701 to the liquid crystal panel side. The light guide plate 702 is made of, for example, translucent plastic, and is stacked on the reflection plate 701 provided on the bottom surface of the lighting device 700. It is weighted. Note that a polycarbonate (PC) resin or a cycloolefin-based resin (COP) can be used as the material of the light guide plate 702.

  The diffusion sheet 703 is for expanding the visual field, and is made of a film having a diffusion transmission function made of, for example, polyethylene terephthalate resin or polyester resin, and is stacked on the light guide plate 702.

  The prism sheet 704 is for improving luminance, and is made of, for example, a sheet obtained by bonding an acrylic resin and a polyester resin, and is laminated on the diffusion sheet 703. Note that a diffusion plate (not shown) may be further stacked on the prism sheet 704.

  In the case of the present embodiment, an aperture provided with a reflective sheet (not shown) on the outer surface of the glass bulb except for a part in the circumferential direction of the lamp 200 (on the light guide plate 702 side when inserted into the lighting device 700). It may be a type of lamp.

  As described above, according to the configuration of the lighting apparatus 700 according to the seventh embodiment of the present invention, it is possible to prevent air from flowing into the internal spaces of the low-pressure discharge lamps 200, 300, 500, and 501 provided therein. it can.

(Eighth embodiment)
FIG. 10A shows a front view of a lighting apparatus according to the eighth embodiment of the present invention, and FIG. 10B shows a cross-sectional view taken along the line CC ′ of FIG. An illuminating device 800 according to an eighth embodiment of the present invention (hereinafter referred to as “illuminating device 800”) is a luminaire using an annular fluorescent lamp for general illumination.

  The lighting device 800 includes a main body portion 801, a plate-like portion 802, a lamp holder 803, a socket 804, and a lamp 805.

  The main body 801 houses a lighting circuit (not shown) and the like, and an electrical connection part (not shown) is led out from the upper part, for example, and the base 806 of the lamp 805 is electrically connected from the side part, for example. A socket 804 for connection is provided.

  The disk-shaped part 802 is a member that supports the main body 801 and the lamp holder 803 and has, for example, a disk-shaped shape.

  The lamp holder 803 is attached to the lower surface of the plate-like portion 802, and the lamp 805 can be held by, for example, a C-shaped sandwiching piece provided at the lower end thereof to prevent the lamp 805 from falling.

  The lamp 805 is an annular hot cathode fluorescent lamp, and the low-pressure discharge lamp 500 according to the fifth embodiment, except that the shape is annular and the base 806 is located in the middle of the lamp 805. It has substantially the same configuration. Note that the lamp 805 may have substantially the same configuration as the lamp 501 except that the lamp 805 has an annular shape and the base 806 is positioned at an intermediate portion of the lamp 805.

  As described above, according to the configuration of the lighting apparatus 800 according to the eighth embodiment of the present invention, air can be prevented from flowing into the internal space of the low-pressure discharge lamp 805 provided therein.

(Ninth embodiment)
An outline of an image display apparatus according to the ninth embodiment of the present invention is shown in FIG. As shown in FIG. 11, the image display device 900 is, for example, a 32 [inch] liquid crystal television (liquid crystal display device), a liquid crystal screen unit 901 including a liquid crystal panel and the like, and an illumination device 600 according to the sixth embodiment of the present invention. And a lighting circuit 902.

  The liquid crystal screen unit 901 is a known one and includes a liquid crystal panel (color filter substrate, liquid crystal, TFT substrate, etc.) (not shown), a drive module, etc. (not shown), and is based on an image signal from the outside. To form a color image.

  The lighting circuit 902 lights the lamp 200 inside the lighting device 600. The lamp 200 is operated at a lighting frequency of 40 [kHz] to 100 [kHz] and a lamp current of 3.0 [mA] to 25 [mA].

  In addition, although FIG. 11 demonstrated the case where the low voltage | pressure discharge lamp 200 which concerns on 2nd Embodiment was inserted in the illuminating device 600 which concerns on the 6th Embodiment of this invention as a light source device of the image display apparatus 900, in this, Not limited to this, the lamp 300, the lamp 500, or the lamp 501 can also be used. In addition, the lighting device 700 can be used as the lighting device.

  As described above, according to the configuration of the image display apparatus 900 according to the ninth embodiment of the present invention, air can be prevented from flowing into the internal space of the low-pressure discharge lamps 200, 300, 500, and 501 provided therein. Can do.

(Modification)
As described above, the present invention has been described based on the specific examples shown in the above embodiments. However, the content of the present invention is not limited to the specific examples shown in the respective embodiments. Variations can be used.
1. Electron Emissive Material An electron emissive material layer (not shown) may be formed on the surface of the electrode 101. In this case, the lamp voltage can be lowered compared to a lamp not provided with an electron emissive material layer. Specifically, the electron-emitting material layer is formed on the inner surface of the electrode 101, for example. The electron emissive material layer includes, for example, a rare earth element. This is because the cold cathode fluorescent lamp is effective in reducing the lamp voltage. Furthermore, the rare earth element is more preferably one or more of lanthanum (La) and yttrium (Y).

  The electron-emitting material layer may be any one of silicon (Si), aluminum (Al), zirconium (Zr), boron (B), zinc (Zn), bismuth (Bi), phosphorus (P), and tin (Sn). It is preferable that 1 or more types are included. In this case, the lamp voltage reduction effect can be further sustained.

Furthermore, a cesium (Cs) compound may be included in the electron-emitting material layer. In this case, the dark start characteristics of the lamp can be further improved. In addition to the electron-emitting material layer, a cesium compound may be attached to the inner surface or outer surface of the electrode 101. As the cesium compound, for example, it is preferable to use at least one of cesium sulfate, cesium aluminate, cesium niobate, cesium tungstate, cesium molybdate, and cesium chloride. The cesium compound is more preferably attached to the outer side surface of the electrode 101. In this case, the cesium compound can be moderately activated easily in the manufacturing process of the cold cathode fluorescent lamp. Furthermore, it is even more preferable that the electrode 101 is attached to the tip of the lamp central portion on the outer side surface. In this case, the cesium compound can be more easily activated in the manufacturing process of the cold cathode fluorescent lamp.
2. About a base The principal part expanded front view of the modification of the low voltage | pressure discharge lamp which concerns on the 2nd Embodiment of this invention is shown to Fig.12 (a), and the principal part expanded sectional view containing the pipe axis is shown in FIG.12 (b), respectively. Show. A modification of the low-pressure discharge lamp according to the second embodiment of the present invention (hereinafter referred to as “lamp 203”) has substantially the same configuration as the lamp 200 except that a base 204 is provided. Therefore, hereinafter, the base 204 will be described in detail, and description of other points will be omitted.

  The base 204 is electrically and mechanically connected to the external lead wire 104. Specifically, the base 204 includes a body part 204 a that covers the end of the glass bulb 201, and an extension part 204 b that extends from one end of the body part 204 a and is electrically and mechanically connected to the external lead wire 104. It consists of Such a lamp 203 can be electrically and mechanically connected by simply inserting the base 204 into a fuse socket (not shown) or the like when incorporated in the lighting device.

  A holding portion 204c for holding the glass bulb 201 is provided on the side surface of the body portion 204a. The holding part 204c is formed, for example, by cutting out a part of the side surface of the body part 204a and bending it to the glass bulb 201 side. Further, the front end portion 204d of the holding portion 204c is bent to the opposite side of the glass bulb 201 so as not to damage the glass bulb 201. In addition, it is preferable that 3 [locations] or more of the holding portions 204c are provided at substantially equal intervals in the circumferential direction of the body portion 204a. In this case, the glass bulb 201 can be held more stably. Furthermore, it is preferable that the contact portion between the holding portion 204 c and the glass bulb 201 is in a portion facing the electrode 101. In this case, heat dissipation generated near the electrode 101 can be promoted via the holding portion 204c.

In addition, since heat generated in the electrode 101 can be easily radiated through the base 204, an excessive increase in the temperature around the electrode 101 is suppressed in the case where an electron-emitting material layer is provided on the surface of the electrode. By suppressing the decrease of mercury in the vicinity of the electrode 101, sputtering of the electron-emitting material layer can be suppressed, and the effect of reducing the lamp voltage can be maintained as compared with a lamp in which the base 204 is not provided.
3. Regarding Glass Members 103 and 403 and Glass Bulb 201 (1) About UV Absorption 254 [nm] by doping a glass, which is a material of glass members 103 and 403 and glass bulb 201, with a transition metal oxide in a predetermined amount depending on its type. ] And 313 [nm] ultraviolet rays can be absorbed. Specifically, for example, in the case of titanium oxide (TiO ₂ ), the composition ratio of 0.05 [mol%] or more is doped to absorb ultraviolet rays of 254 [nm], and the composition ratio is 2 [mol%] or more. Thus, it is possible to absorb ultraviolet rays of 313 [nm]. However, when titanium oxide is doped more than the composition ratio of 5.0 [mol%], the glass is devitrified, so the composition ratio is 0.05 [mol%] or more and 5.0 [mol%] or less. It is preferable to dope in the range.

In the case of cerium oxide (CeO ₂ ), 254 [nm] ultraviolet rays can be absorbed by doping at a composition ratio of 0.05 [mol%] or more. However, when cerium oxide is doped more than 0.5 [mol%], the glass is colored, so cerium oxide has a composition ratio of 0.05 [mol%] to 0.5 [mol%]. It is preferable to dope in the following range. In addition, since coloring of glass by cerium oxide can be suppressed by doping tin oxide (SnO) in addition to cerium oxide, cerium oxide can be doped to a composition ratio of 5.0 [mol%] or less. . In this case, if cerium oxide is doped with a composition ratio of 0.5 [mol%] or more, ultraviolet rays of 313 [nm] can be absorbed. However, even in this case, when the composition ratio of cerium oxide is more than 5.0 [mol%], the glass is devitrified.

  In the case of zinc oxide (ZnO), ultraviolet rays having a wavelength of 254 [nm] can be absorbed by doping with a composition ratio of 2.0 [mol%] or more. However, when zinc oxide is doped more than 20 [mol%], the glass may be devitrified, so zinc oxide is in the range of 2.0 [mol%] to 20 [mol%]. It is preferable to dope.

Further, in the case of iron oxide (Fe ₂ O ₃ ), 254 [nm] ultraviolet rays can be absorbed by doping at a composition ratio of 0.01 [mol%] or more. However, when iron oxide is doped more than the composition ratio of 2.0 [mol%], the glass is colored, so the iron oxide is contained in the composition ratio of 0.01 [mol%] to 2.0 [mol%]. It is preferable to dope in the following range.
(2) Infrared transmission coefficient The infrared transmission coefficient indicating the water content in the glass that is the material of the glass members 103 and 403 and the glass bulb 201 is in the range of 0.3 to 1.2, particularly 0.4 or more. It is preferable to adjust so that it may become the range of 0.8 or less. If the infrared transmittance coefficient is 1.2 or less, it is easy to obtain a low dielectric loss tangent applicable to a high voltage application lamp such as a long cold cathode discharge lamp, and if it is 0.8 or less, the dielectric loss tangent is sufficient. It becomes small and becomes applicable to a high voltage application lamp.

  The infrared transmittance coefficient (X) can be expressed by the following formula.

[Equation 1]
X = (log (a / b)) / t
a: Transmittance [%] of a minimum point near 3840 [cm ⁻¹ ]
b: Transmittance [%] of a minimum point in the vicinity of 3560 [cm ⁻¹ ].
t: the thickness of the glass (3) Glass used for glass members 103,403 and the glass bulb 201 for lead-free glass, in terms of oxide, SiO ₂ is 60 [wt%] ~75 [wt ]%, Al 2 O 3 Is 1 [wt%] to 5 [wt%], Li ₂ O is 0 [wt%] to 5 [wt%], K ₂ O is 3 [wt%] to 11 [wt%], and Na ₂ O is 3 [Wt%] to 12 [wt%], CaO from 0 [wt%] to 9 [wt%], MgO from 0 [wt%] to 9 [wt%], and SrO from 0 [wt%] to 12 [wt] %] And BaO may have a composition of 0 [wt%] to 12 [wt%]. In this case, an environment-friendly cold cathode discharge lamp that does not contain a lead component can be provided. Furthermore, the glass used for the glass members 103 and 403 and the glass bulb 201 has an oxide conversion of SiO ₂ of 60 [wt%] to 75 [wt]% and Al ₂ O ₃ of 1 [wt%] to 5 [5%]. wt%], B ₂ O ₃ is 0 [wt%] to 3 [wt%], Li ₂ O is 0 [wt%] to 5 [wt%], and K ₂ O is 3 [wt%] to 11 [wt]. %], Na ₂ O 3 [wt%] to 12 [wt%], CaO 0 [wt%] to 9 [wt%], MgO 0 [wt%] to 9 [wt%], and SrO 0 It is more preferable that [wt%] to 12 [wt%] and BaO have a composition of 0 [wt%] to 12 [wt%].

Moreover, the glass used for the glass members 103 and 403 and the glass bulb 201 is, in terms of oxide, SiO ₂ of 60 [wt%] to 75 [wt]% and Al ₂ O ₃ of 1 [wt%] to 5 [wt]. %], Li ₂ O is 0.5 [wt%] to 5 [wt%], K ₂ O is 3 [wt%] to 7 [wt%], and Na ₂ O is 5 [wt%] to 12 [wt]. %], CaO 1 [wt%] to 7 [wt%], MgO 1 [wt%] to 7 [wt%], SrO 0 [wt%] to 5 [wt%], BaO 7 [wt] %] To 12 [wt%]. In this case, it is possible to provide an environment-friendly cold cathode fluorescent lamp that is easy to process into a lamp and does not contain a lead component.

Furthermore, the glass used for the glass members 103 and 403 and the glass bulb 201 has an oxide conversion of SiO ₂ of 65 [wt%] to 75 [wt]% and Al ₂ O ₃ of 1 [wt%] to 5 [wt]. %], B ₂ O ₃ is 0 [wt%] to 3 [wt%], Li ₂ O is 0.5 [wt%] to 5 [wt%], and K ₂ O is 3 [wt%] to 7 [wt%]. wt%], Na ₂ O is 5 [wt%] ~12 [wt %], CaO is 2 [wt%] ~7 [wt %], MgO is 2.1 [wt%] ~7 [wt %], SrO may have a composition of 0 [wt%] to 0.9 [wt%], and BaO may have a composition of 7.1 [wt%] to 12 [wt%]. In this case, it does not contain a lead component, has an electrical insulating property suitable for lighting applications, and can prevent devitrification. Furthermore, glass used in the glass member 103,403 and the glass bulb 201, in terms of oxide, SiO ₂ is 65 [wt%] ~75 [wt ]%, Al 2 O 3 is 1 [wt%] ~3 [ wt%], B ₂ O ₃ is 0 [wt%] to 3 [wt%], Li ₂ O is 1 [wt%] to 3 [wt%], and K ₂ O is 3 [wt%] to 6 [wt]. %], Na ₂ O 7 [wt%] to 10 [wt%], CaO 3 [wt%] to 6 [wt%], MgO 3 [wt%] to 6 [wt%], and SrO 0 It is more preferable that [wt%] to 0.9 [wt%] and BaO have a composition of 7.1 to 10 [wt%].
(4) Shape of Glass Bulb 201 The shape of the glass bulb 201 is not limited to a straight tube shape, and may be, for example, an L shape, a U shape, a U shape, a spiral shape, or the like. Further, the cross section cut substantially perpendicular to the tube axis is not limited to a substantially circular shape, and may be a flat shape such as a track shape or a rounded round shape, an elliptical shape, or the like.
4). Regarding phosphors in the phosphor layer (1) UV absorption For example, in recent years, with the increase in size of liquid crystal color televisions, polycarbonate with good dimensional stability has been used for the diffusion plate that closes the opening of the backlight unit. ing. This polycarbonate is easily deteriorated by ultraviolet rays having a wavelength of 313 [nm] emitted from mercury. In such a case, a phosphor that absorbs ultraviolet light having a wavelength of 313 [nm] may be used. The following phosphors absorb 313 [nm] ultraviolet rays.
(A) Blue Europium / manganese co-activated barium aluminate / strontium / magnesium [Ba _1-xy Sr _x Eu _y Mg _1-z Mn _z Al ₁₀ O ₁₇ ] or [Ba _1-xy Sr _x Eu _y Mg _{2− z} Mn _z Al ₁₆ O ₂₇ ]
Here, x, y, and z are preferably numbers satisfying the conditions of 0 ≦ x ≦ 0.4, 0.07 ≦ y ≦ 0.25, and 0 ≦ z <0.1, respectively.

Examples of such phosphors include europium activated barium magnesium aluminate [BaMg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ ], [BaMgAl ₁₀ O ₁₇ : Eu ²⁺ ] (abbreviation: BAM-B), Europium activated barium aluminate / strontium / magnesium [(Ba, Sr) Mg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ ], [(Ba, Sr) MgAl ₁₀ O ₁₇ : Eu ²⁺ ] (abbreviation: SBAM-B) Etc.
(B) Green • Manganese inactive magnesium gallate [MgGa ₂ O ₄ : Mn ²⁺ ] (abbreviation: MGM)
Manganese activated cerium aluminate, magnesium, zinc [Ce (Mg, Zn) Al ₁₁ O ₁₉ : Mn ²⁺ ] (abbreviation: CMZ)
· Active aluminate, cerium-magnesium with terbium ^{_{[CeMgAl 11 O 19: Tb 3+}} ] ( abbreviation: CAT)
• Europium • Manganese co-activated barium aluminate • Strontium • Magnesium [Ba _{1 -xy} Sr _x Eu _y Mg _{1 -z} Mn _z Al ₁₀ O ₁₇ ] or [Ba _{1 -xy} Sr _x Eu _y Mg _{2 -z} Mn _z Al ₁₆ O ₂₇ ]
Here, x, y and z are numbers satisfying the conditions of 0 ≦ x ≦ 0.4, 0.07 ≦ y ≦ 0.25, and 0.1 ≦ z ≦ 0.6, respectively, and z is 0.4 It is preferable that ≦ x ≦ 0.5.

Examples of such phosphors include europium / manganese co-activated barium aluminate / magnesium [BaMg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ , Mn ²⁺ ], [BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ^{2]. +} ] (Abbreviation: BAM-G), europium / manganese co-activated barium aluminate / strontium / magnesium [(Ba, Sr) Mg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ , Mn ²⁺ ], [(Ba, Sr) MgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ²⁺ ] (abbreviation: SBAM-G).
(C) Red • Europium activated phosphorus • Yttrium vanadate [Y (P, V) O ₄ : Eu ³⁺ ] (abbreviation: YPV)
Europium activated yttrium vanadate [YVO ₄ : Eu ³⁺ ] (abbreviation: YVO)
・ Europium-activated yttrium oxysulfide [Y ₂ O ₂ S: Eu ³⁺ ] (abbreviation: YOS)
Manganese activated magnesium fluoride germane acid _{[3.5MgO · 0.5M gF 2 · GeO} 2: Mn 4+] ( abbreviation: MFG)
Dysprosium-activated yttrium vanadate [YVO ₄ : Dy ³⁺ ] (red and green two-component phosphor, abbreviation: YDS)
In addition, you may mix and use the fluorescent substance of a different compound with respect to one type of luminescent color. For example, only BAM-B (absorbs 313 [nm]) in blue, LAP (does not absorb 313 [nm]) in green, BAM-G (absorbs 313 [nm]) in green, and YOX in red Alternatively, a phosphor of YVO (absorbs 313 [nm]) may be used. In such a case, as described above, the phosphor that absorbs the wavelength 313 [nm] is adjusted so that the total weight composition ratio is larger than 50%, so that the ultraviolet rays almost leak out of the glass bulb. Can be prevented. Therefore, when the phosphor layer 202 includes a phosphor that absorbs ultraviolet rays of 313 [nm], deterioration due to ultraviolet rays such as a diffusion plate made of polycarbonate (PC) that closes the opening of the backlight unit is suppressed, The characteristics as a backlight unit can be maintained for a long time.

Here, “absorbing ultraviolet rays of 313 [nm]” means an excitation wavelength spectrum near 254 [nm] (excitation wavelength spectrum means excitation light emission while changing the wavelength of the phosphor, and the excitation wavelength and emission intensity are changed. The intensity of the excitation wavelength spectrum at 313 [nm] is defined as 80 [%] or more. That is, the phosphor that absorbs ultraviolet rays of 313 [nm] is a phosphor that can absorb ultraviolet rays of 313 [nm] and convert it into visible light.
(2) High color reproduction Liquid crystal display devices typified by liquid crystal color televisions have been used as a light source for a backlight unit of the liquid crystal display device in accordance with the recent high color reproduction that has been made as part of higher image quality. There is a need to expand the reproducible chromaticity range in cathode discharge lamps and external electrode discharge lamps.

  In response to such a request, for example, by using the following phosphor, the chromaticity range can be expanded as compared with the case of using the phosphor in the embodiment. Specifically, in the CIE 1931 chromaticity diagram, the chromaticity coordinate value of the phosphor for high color reproduction includes a triangle formed by connecting the chromaticity coordinate values of the three phosphors used in the embodiment. Located at the coordinates that expand the reproduction range.

(A) Blue • Europium-activated strontium chloroapatite [Sr ₁₀ (PO ₄ ) ₆ Cl ₂ : Eu ²⁺ ] (abbreviation: SCA), chromaticity coordinates: x = 0.151, y = 0.065
In addition to the above, europium activated strontium, calcium, barium, chloroapatite [(Sr, Ca, Ba) ₁₀ (PO ₄ ) ₆ Cl ₂ : Eu ²⁺ ] (abbreviation: SBCA) can also be used, and the wavelength 313 (nm) SBAM-B, which can absorb ultraviolet rays), can also be used for high color reproduction.

(B) Green BAM-G, chromaticity coordinates: x = 0.139, y = 0.574
CMZ, chromaticity coordinates: x = 0.164, y = 0.722
CAT, chromaticity coordinates: x = 0.267, y = 0.663
As described above, these can also absorb ultraviolet rays having a wavelength of 313 [nm], and in addition to the three phosphor particles described here, MGM can also be used for high color reproduction.

(C) Red • YOS, chromaticity coordinates: x = 0.651, y = 0.344
YPV, chromaticity coordinates: x = 0.658, y = 0.333
MFG, chromaticity coordinates: x = 0.711, y = 0.287
As described above, these can also absorb ultraviolet rays having a wavelength of 313 [nm], and besides the three phosphor particles described here, YVO and YDS can also be used for high color reproduction.

  In addition, the chromaticity coordinate values shown above are representative values measured only with each phosphor powder, and due to the measurement method (measurement principle), etc., the chromaticity coordinates indicated by each phosphor powder The value may be slightly different from the value listed above. For reference, the chromaticity coordinate values of the phosphor powders of the first embodiment are YOX (x = 0.644, y = 0.353), LAP (x = 0.351, y = 0.585). , BAM-B (x = 0.148, y = 0,056).

  Furthermore, the phosphor used for emitting each color of red, green, and blue is not limited to one type for each wavelength, and a plurality of types may be used in combination.

  Here, the case where a phosphor layer is formed using the above-described phosphor particles for high color reproduction will be described. In this evaluation, there are three evaluations in the case of using a phosphor for high color reproduction based on the area of NTSC triangle (NTSC triangle) connecting the chromaticity coordinate values of the three primary colors of the NTSC standard in the CIE1931 chromaticity diagram. It is performed by a ratio of the area of a triangle formed by connecting chromaticity coordinate values (hereinafter referred to as NTSC ratio).

  For example, when BAM-B is used as blue, BAM-G as green, and YVO as red (Example 1), the NTSC ratio is 92%, and SCA is used as blue, BAM-G as green, and YVO as red. (Example 2) When NTSC ratio is 100%, SCA is used as blue, BAM-G is used as green, and YOX is used as red (Example 3), NTSC ratio is 95%. The luminance can be improved by 10 [%] as compared with the above.

Note that the chromaticity coordinate values used for the evaluation here are measured in the state of a liquid crystal display device in which a lamp or the like is incorporated, so that the color reproduction range is around the above value depending on the combination with the color filter. there is a possibility.
5). About filled gas Krypton may be contained in the rare gas. In this case, infrared radiation of the cold cathode fluorescent lamp can be suppressed. Furthermore, it is preferable that krypton is contained in the rare gas within a range of 0.5 [mol%] to 5 [mol%]. In this case, infrared radiation of the cold cathode fluorescent lamp can be suppressed without greatly changing the lamp voltage. For example, argon is in the range of 0 [mol%] to 9.5 [mol%], neon is in the range of 90 [mol%] to 95.5 [mol%], and krypton is 0.5 [mol%]. ] In the range of 5 [mol%] or less. Furthermore, it is more preferable that krypton is contained in the rare gas within a range of 0.5 [mol%] to 3 [mol%]. Furthermore, it is even more preferable that krypton is contained in the rare gas in the range of 1 [mol%] to 3 [mol%].
6). Regarding the types of lamps In the above embodiments, the cold cathode fluorescent lamp, the internal / external electrode fluorescent lamp, and the hot cathode fluorescent lamp have been mainly described as the low-pressure discharge lamp. It may be an ultraviolet lamp in which no body layer is formed.

  The present invention can be widely applied to an electrode structure, a method for manufacturing the electrode structure, a low-pressure discharge lamp, an illumination device, and an image display device.

100, 107, 400, 404 Electrode structure 101, 401, 405 Electrode 102, 402, 406 Sealing wire 103, 403 Glass member 105 Oxide film 106 Diffusion layer 200, 300, 500, 501 Low pressure discharge lamp 201 Glass bulb 600, 700, 800 Illumination device 900 Image display device

Claims (12)

An electrode structure having an electrode, a sealing wire having one end connected to the electrode, and a glass member formed to cover at least a part of the sealing wire,
Of the surface of the sealing wire, an oxide film is not formed in an approximately middle portion of the portion covered with the glass member, or an oxide film having a maximum thickness of 0.1 [μm] or less is formed. And
An electrode structure, wherein a diffusion layer of the material of the sealing wire is formed on the sealing wire side of the glass member. An electrode structure having an electrode, a sealing wire having one end connected to the electrode, and a glass member formed to cover at least a part of the sealing wire,
Of the surface of the sealing wire, an oxide film is not formed on the portion covered with the glass member, or an oxide film having a maximum thickness of 0.1 [μm] or less is formed,
An electrode structure, wherein a diffusion layer of the material of the sealing wire is formed on the sealing wire side of the glass member. An electrode structure having an electrode, a sealing wire having one end connected to the electrode, and a glass member formed to cover at least a part of the sealing wire,
Of the surface of the sealing wire, an oxide film having a maximum thickness of 0.1 [μm] or less is formed in a substantially middle portion of the portion covered with the glass member,
The oxide film contains at least one of Fe ₃ O ₄ and FeO,
An electrode structure, wherein a diffusion layer of the material of the sealing wire is formed on the sealing wire side of the glass member. An electrode structure having an electrode, a sealing wire having one end connected to the electrode, and a glass member formed to cover at least a part of the sealing wire,
Of the surface of the sealing wire, an oxide film having a maximum thickness of 0.1 [μm] or less is formed on the portion covered with the glass member,
The oxide film contains at least one of Fe ₃ O ₄ and FeO,
An electrode structure, wherein a diffusion layer of the material of the sealing wire is formed on the sealing wire side of the glass member. 5. The electrode structure according to claim 1, wherein the minimum thickness of the diffusion layer is 8 [μm] or more, and the maximum thickness of the diffusion layer is 30 [μm] or less. . The sealing wire includes iron in a range of 48 [wt%] to 54 [wt%] and nickel in a range of 46 [wt%] to 52 [wt%]. Item 6. The electrode structure according to any one of Items 1 to 5. In the glass member, in terms of oxide, SiO ₂ is 60 wt% to 75 wt%, Al ₂ O ₃ is 1 wt% to 5 wt%, and Li ₂ O is 0 wt%. _{] ~5 [wt%], K} 2 O is 3 [wt%] ~11 [wt %], Na 2 O is 3 [wt%] ~12 [wt %], CaO is 0 [wt%] ~9 [ wt%], MgO has a composition of 0 [wt%] to 9 [wt%], SrO has a composition of 0 [wt%] to 12 [wt%], and BaO has a composition of 0 [wt%] to 12 [wt%]. The electrode structure according to any one of claims 1 to 6. An electrode structure having an electrode, a sealing wire having one end connected to the electrode, and a glass member formed to cover at least a part of the sealing wire,
Of the surface of the sealing wire, the entire oxide film formed in the middle portion of the portion covered with the glass member is diffused, or an oxide film having a maximum thickness of 0.1 [μm] or less remains. The electrode structure is characterized in that a diffusion layer of the material of the sealing wire is formed on the sealing wire side of the glass member. An electrode structure comprising: an electrode; a sealing wire having one end connected to the electrode; and a glass member formed to cover at least a part of the sealing wire,
Connecting the electrode and one end of the sealing wire;
Forming an oxide film on the surface of the sealing wire;
Covering at least a part of the sealing wire with the glass member, and diffusing all of the oxide film formed in a substantially middle portion of the surface of the sealing wire covered with the glass member; or And a step of diffusing so that an oxide film having a maximum thickness of 0.1 [μm] or less remains. A low-pressure discharge lamp comprising: a glass bulb; and the electrode structure according to any one of claims 1 to 8 provided at at least one end of the glass bulb. An illumination device comprising the low-pressure discharge lamp according to claim 10. An image display device comprising the illumination device according to claim 11.

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