WO2009128118A1 - 冷陰極蛍光ランプ用電極部材 - Google Patents
冷陰極蛍光ランプ用電極部材 Download PDFInfo
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- WO2009128118A1 WO2009128118A1 PCT/JP2008/001010 JP2008001010W WO2009128118A1 WO 2009128118 A1 WO2009128118 A1 WO 2009128118A1 JP 2008001010 W JP2008001010 W JP 2008001010W WO 2009128118 A1 WO2009128118 A1 WO 2009128118A1
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- glass
- oxide film
- electrode member
- lead
- electrode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
- H01J61/366—Seals for leading-in conductors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
- H01J61/067—Main electrodes for low-pressure discharge lamps
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
- H01J61/72—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of easily vaporisable metal vapour, e.g. mercury
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
- Y10T428/2933—Coated or with bond, impregnation or core
- Y10T428/294—Coated or with bond, impregnation or core including metal or compound thereof [excluding glass, ceramic and asbestos]
- Y10T428/2958—Metal or metal compound in coating
Definitions
- the present invention relates to an electrode member used as a constituent member of a cold cathode fluorescent lamp, and a method for manufacturing the electrode member.
- the present invention relates to an electrode member having excellent adhesion between a lead portion and glass.
- Cold cathode fluorescent lamps are used in various light sources such as light sources for irradiating documents such as copying machines and image scanners, and backlights for liquid crystal display devices (liquid crystal displays) such as liquid crystal monitors of personal computers and liquid crystal televisions.
- liquid crystal display devices liquid crystal displays
- it includes a cylindrical glass tube having a phosphor layer on the inner wall surface and a pair of electrodes disposed at both ends of the glass tube, and a rare gas and mercury are enclosed in the glass tube (e.g., a patent Reference 1).
- the electrode is typically in the shape of a cup (bottomed cylindrical shape), a lead wire is joined to the bottom, and a voltage is applied via the lead wire.
- the lead wire includes, for example, an inner lead wire fixed inside the glass tube and an outer lead wire joined to the inner lead wire and disposed outside the glass tube.
- a typical constituent material of the inner lead wire is Kovar (Fe, Co, Ni alloy) close to the thermal expansion coefficient of glass.
- glass beads are fixed to the outer periphery of the inner lead wire so that the inner lead wire and the glass tube are in close contact, and the glass bead and glass tube are melted. To be done. These electrodes, lead wires, and glass beads are bonded together in advance, and the integrated product is fixed to the glass tube.
- Patent Document 1 an oxide film is formed on the outer periphery of the inner lead wire before the glass bead is joined to the inner lead wire.
- Patent Document 1 describes that by forming an oxide film on a lead wire, the wettability between the lead wire and the glass beads can be improved, and the airtightness of the glass tube can be improved.
- the conventional oxide film cannot be said to be sufficiently adhered to the glass beads, and further improvement in bonding strength is desired. If the lead wire and the glass bead are not sufficiently in close contact with each other, constituent members between the lead wire and the glass tube cannot be in close contact with each other, and a gap is formed in the sealed portion of the glass tube. There is a possibility that gas in the glass tube leaks from the gap. When the gas leaks, for example, ultraviolet rays necessary for light emission are not sufficiently emitted, and the life of the fluorescent lamp is shortened.
- a main object of the present invention is to provide an electrode member that can improve the bonding strength between the lead portion and the glass. Another object of the present invention is to provide a manufacturing method suitable for the electrode member.
- the oxide film can be formed by heating the lead wire in an atmosphere containing oxygen such as air.
- this oxide film is composed of iron oxide having a high oxygen content, specifically, ferric trioxide (Fe 2 O 3 ). It is composed of triiron tetroxide (Fe 3 O 4 ).
- Such an oxide film made of iron oxide may not be sufficiently adhered to a glass bead or a glass tube.
- the oxide film is thick, the oxide film itself becomes brittle and easily peels off.
- the difference between the thermal expansion coefficient of the oxide film and the thermal expansion coefficient of glass is relatively large, if the oxide film is thick, an oxide film having a large thermal expansion coefficient is interposed between the glass and the lead wire. . Furthermore, the oxide film formed on the lead portion has many voids. Although these voids are reduced by heating when bonding the glass beads to the lead portion or heating when sealing the glass tube with the electrode member, if the oxide film is thick, many voids remain in the film. There is a possibility that gas in the glass tube leaks due to the remaining gap.
- the present inventors have found that an oxide film containing a specific compound is preferable. Specifically, the bonding strength of an oxide film containing FeO is improved as compared with an oxide film made of Fe 2 O 3 and Fe 3 O 4 . The reason for this is not clear, but it is thought that the oxide film containing FeO improves wettability with glass. Therefore, the electrode member of the present invention is configured to include an oxide film containing FeO.
- the electrode member for a cold cathode fluorescent lamp of the present invention has an electrode portion and a lead portion. The lead portion is connected to the end portion of the electrode portion. Further, at least the surface side of the lead portion is made of an iron-containing metal. An oxide film containing FeO is provided on at least a part of the surface of such a lead portion.
- the lead portion and the glass can be sufficiently adhered, so when the electrode member of the present invention is placed on the glass tube and the opening of the glass tube is sealed, the lead The structural members between the part and the glass tube can be sufficiently adhered to each other. Therefore, when a cold cathode fluorescent lamp is formed using the electrode member of the present invention, this fluorescent lamp can suppress gas leakage from the sealed portion of the glass tube, and sufficient gas (especially mercury) in the glass tube. Presence of this increases the lifetime. Further, since this lamp has a sufficient gas (same as above), it is possible to maintain a high luminance and to suppress a shortening of the lifetime due to a decrease in the luminance.
- the electrode member of the present invention can be manufactured by the following manufacturing method of the present invention.
- the manufacturing method of the electrode member for a cold cathode fluorescent lamp of the present invention is a method of manufacturing an electrode member having a lead portion at an end portion of the electrode portion, and includes the following oxide film forming step.
- oxide Film Forming Step The outer periphery of the lead part is heated to form an oxide film on the surface of the lead part. At least the surface side of the lead portion is made of an iron-containing metal. And this process comprises the two processes from which the atmosphere shown below differs.
- ⁇ Oxidizing Step> The lead portion is heated in an oxidizing atmosphere to form an oxide film.
- ⁇ Non-oxidizing step> After the oxidizing step, the lead portion is heated in a non-oxidizing atmosphere to generate FeO in the oxide film.
- the above manufacturing method of the present invention can easily manufacture the electrode member of the present invention having an oxide film containing FeO by heating the lead part in different atmospheres.
- the present invention will be described in more detail.
- the electrode member of the present invention is used as a constituent material of a cold cathode fluorescent lamp, and includes an electrode part used for discharge and a lead part for supplying power to the electrode part.
- an electrode member used for a cold cathode fluorescent lamp that is required to have a long life and high quality is an adhesive agent for fixing the electrode part to the glass tube of the fluorescent lamp in addition to the electrode part and the lead part. It is preferable to provide a glass portion that functions as a sealing member for a glass tube.
- the lead portion for example, one having an inner lead portion and an outer lead portion can be used.
- the inner lead portion is a portion where the electrode portion is bonded to one end and is fixed to the inside of the glass tube
- the outer lead portion is a portion that is bonded to the inner lead portion and exposed to the outside of the glass tube. is there.
- the inner lead portion and the outer lead portion are joined by welding or the like.
- the welding bump is provided at the joint portion, the position deviation of the glass portion can be prevented by using the welding bump as a glass bead stopper described later.
- a wire made of nickel (Ni), a wire made of a nickel alloy such as MnNi, a wire made of dumet, and the like can be used.
- These wires may include a plating layer such as a nickel plating layer.
- the inner lead portion is bonded to the outer periphery of a glass such as a glass tube or a glass portion made of glass beads, a wire made of a material having a thermal expansion coefficient close to that of glass can be suitably used.
- the inner lead part can use suitably the wire which consists of material excellent in electroconductivity.
- a material that satisfies such characteristics is an iron (Fe) -containing metal.
- the electrode member of the present invention uses a wire made of an iron-containing metal at least on the surface side for the inner lead portion.
- An oxide film is formed in advance on at least a part of the surface of the inner lead portion. More specifically, an oxide film is formed on the surface of the inner lead portion where it is covered with a glass tube or a glass portion. Therefore, when this invention electrode member has a glass part joined to the outer periphery of a lead part, as for this electrode member, an oxide film exists in the boundary vicinity of a glass part and an inner lead part.
- the oxide film is made of an oxide formed by oxidizing the constituent elements of the lead portion.
- the oxide film is substantially made of iron oxide.
- the oxide film is composed of diiron trioxide (Fe 2 O 3 ) and triiron tetroxide (Fe 3 O 4 ).
- the electrode member of the present invention includes an oxide film containing iron monoxide (FeO) in addition to Fe 2 O 3 and Fe 3 O 4 by forming an oxide film under specific conditions as described later.
- an oxide film containing FeO tends to have better adhesion to glass compared to an oxide film made of Fe 2 O 3 and Fe 3 O 4 , and the higher the FeO content, the higher the adhesion. .
- the FeO content is preferably 1% or more, more preferably 10% or more by volume ratio.
- the ratio of the compound constituting the material changes due to heating when the glass portion is bonded to the lead portion or heating when the electrode member is fixed to the glass tube. Specifically, the content of FeO tends to be reduced by the heating. Therefore, in the case of an electrode member having a glass part, in the electrode member after the glass part is formed, before the glass part is formed so that the content of FeO in the oxide film is 1% or more by volume ratio
- an oxide film is formed in the lead part so that the content of FeO in the oxide film exceeds 1% by volume.
- the oxide film is formed so that the content of FeO in the oxide film provided in the lead portion is 10% or more, preferably 50% or more by volume.
- the presence or absence of FeO in the oxide film and the volume ratio of the oxide species in the entire film can be measured by, for example, XRD.
- the thickness of the oxide film of the electrode member is preferably 1 ⁇ m or more and less than 10 ⁇ m, more preferably 1 ⁇ m or more and 7 ⁇ m or less, regardless of the presence or absence of the glass portion.
- the thickness of the oxide film of the electrode member is less than 1 ⁇ m, the thickness of the oxide film is likely to be reduced by heating when the electrode member is fixed to the glass tube, and the oxide film may be lost. Since the oxide film disappears, the constituent elements of the lead part are easily diffused to the glass side, and an ion diffusion layer described later tends to be thick. If it exceeds 10 ⁇ m, a large number of voids may remain in the oxide film even if heating is performed to fix the glass tube.
- the thickness of the oxide film can be adjusted according to the size (diameter) of the lead portion and the size (inner diameter) of the glass tube.
- the thickness of the oxide film of the electrode member is preferably within the above range.
- the thickness of the oxide film can be made larger than the above range.
- the oxide film formed on the lead part is thinned by diffusion of elements constituting the oxide film to the glass side by heating at the time of bonding the glass part. Therefore, the oxide film formed on the lead part before forming the glass part is larger than this range so that the thickness of the oxide film of the electrode member after forming the glass part is in the above range (1 to 10 ⁇ m). Form thick. Specifically, about 6 to 20 ⁇ m is preferable.
- the thickness of the oxide film before forming the glass part may be adjusted as appropriate, and the thickness of the oxide film after forming the glass part may satisfy the above range.
- An oxide film containing FeO can be formed by two-step heating.
- the first heating is performed in an oxidizing atmosphere (oxidizing process), and oxygen (O) and the constituent element (Fe) of the lead portion are combined to form Fe 2 O 3 or Fe 3 O 4 .
- a burner or an electric furnace can be used for this heating.
- the burner is easy to adjust the combustion gas, and an oxide film having a desired thickness can be stably formed by appropriately adjusting the combustion gas. Since an electric furnace can form an oxide film on a large number of lead portions at once, it is excellent in mass productivity when an electric furnace is used.
- the conditions for using a burner are: heating temperature: 900-1200 ° C, heating time: 3-12 seconds, and conditions for using an electric furnace: heating temperature: 650 -1000 ° C, heating time: 2-8 minutes. The higher the heating temperature or the longer the heating time, the thicker the oxide film tends to be. More preferable conditions are: When using a burner, heating temperature: 950 to 1150 ° C, heating time: 3 to 8 seconds, when using an electric furnace, heating temperature: 700 to 850 ° C, heating time: 3 to 5 minutes is there. When it is set as the electrode member which does not have a glass part, it is good to shorten the said heating time.
- the oxidizing atmosphere should just contain oxygen, for example, air atmosphere is mentioned. Since this oxidizing process is heating in an oxidizing atmosphere, oxygen (O) and iron (Fe) in the constituent material of the inner lead part combine to form oxygen such as Fe 2 O 3 and Fe 3 O 4 . Iron oxide with a large amount of bonds is produced, and FeO is not produced.
- the second stage heating is performed in a non-oxidizing atmosphere (non-oxidizing step).
- a non-oxidizing atmosphere non-oxidizing step
- the thickness of the oxide film does not substantially increase, and is a constituent element of the lead portion in the oxide film formed by the first stage heating (oxidation process) Fe is diffused.
- the atomic ratio of Fe in the oxide film is increased, and FeO can be generated in the film.
- this heating is performed in a non-oxidizing atmosphere, it is preferable to use an electric furnace. Further, this heating is preferably performed as much as necessary to change the compound constituting the oxide film. Specific conditions include heating temperature: 900 to 1100 ° C. and heating time: 3 to 5 minutes. More preferable conditions are heating temperature: 950 to 1050 ° C.
- the non-oxidizing atmosphere does not need to substantially contain oxygen, and examples thereof include an inert atmosphere made of an inert gas such as nitrogen (N 2 ), argon (Ar), or helium (He).
- the inert gas may be a reducing atmosphere containing a reducing gas such as hydrogen.
- Ni nickel (pure Ni), tungsten (W), molybdenum (Mo), or the like can be used as a material for forming the electrode part.
- Pure Ni is excellent in workability and economy.
- W and Mo have a very high melting point compared to pure Ni, and can reduce consumption of the electrode part and a decrease in luminance.
- a Ni alloy formed by adding an additive element to pure Ni can be used as a forming material.
- Ni alloy which contains 0.001 mass% or more and 5.0 mass% or less of elements more than a seed
- it contains at least one element selected from Be, Si, Al, Y and rare earth elements (excluding Y) in a total amount of 0.001% by mass to 3.0% by mass, with the balance being Ni and inevitable impurities.
- An alloy may be used.
- the electrode part made of such an Ni alloy has a work function smaller than that of an electrode made of pure Ni, and is easy to discharge. 2. Difficult to sputter (sputtering rate or etching rate is small). 3. Forms an amalgam. 4. It has various advantages such as 4. It is difficult to form an oxide film and it is difficult to inhibit discharge. In particular, a Ni alloy containing Y can improve the sputtering resistance.
- a typical shape of the electrode part is a cup shape (bottomed cylindrical shape).
- the cup-shaped electrode portion can be easily formed by pressing a plate-shaped material.
- the cup-shaped electrode portion can suppress sputtering due to the hollow cathode effect.
- the glass part is formed by inserting and heating cylindrical glass beads around the outer periphery of the lead part (inner lead part) on which the oxide film is formed and deforming it. To do. Moreover, a glass part is joined to the outer periphery of an inner lead part by this heating.
- the glass beads for example, those made of borosilicate glass or aluminosilicate glass can be used.
- the ion diffusion layer of the electrode member is preferably as thin as possible, and the thickness is preferably 15 ⁇ m or less, particularly preferably 12 ⁇ m or less.
- the glass part may be formed using a burner or an electric furnace.
- a method can be used in which glass beads are heated in a reducing atmosphere to be deformed and bonded, and at the same time, an oxide film at a portion (exposed portion) not covered with the glass portion in the lead portion is reduced.
- the heating temperature is set to a high temperature or the heating time is lengthened to sufficiently melt the glass portion and increase the wettability to the oxide film. It is effective.
- the heating temperature is high or the heating time is long, the glass beads are deformed so as to extend along the oxide film of the lead portion, and it is difficult to obtain a desired shape.
- the glass beads are easily deformed into a desired shape, but cannot be sufficiently joined. Therefore, the glass beads can be deformed into a desired shape by performing two-step heating as described later, instead of performing deformation and bonding by a single heating, and the glass beads and the lead part are sufficiently bonded. This is preferable because it can prevent the thickening of the ion diffusion layer.
- a glass part forming step including the following deformation step and bonding step.
- Glass beads are arranged on the outer periphery of the lead part on which the oxide film is formed, and the glass part is heated and deformed to form the glass part, and the glass part is joined to the lead part.
- Heating temperature 700 to 800 ° C
- heating time 3 to 5 minutes
- Heating temperature 900 to 1100 ° C
- heating time 3 to 5 Min
- the deformation process is a heating process for mainly deforming the glass beads.
- the non-oxidizing atmosphere include an inert atmosphere made of an inert gas such as nitrogen, argon, or helium. Because of the non-oxidizing atmosphere, this heating is preferably performed using an electric furnace. In addition, an electric furnace can deform many glass beads at a time, and when an electric furnace is used, it is excellent in mass productivity. More preferable conditions are heating temperature: 750 to 800 ° C. and heating time: 3.5 to 4 minutes. Since the deformation process is performed at a relatively low temperature, the ion diffusion layer is hardly formed.
- the bonding process is a heating process mainly for bonding the deformed glass beads and the lead portions.
- the reducing atmosphere include an atmosphere containing a reducing gas such as hydrogen in an inert gas such as nitrogen, argon, or helium.
- a reducing gas such as hydrogen
- an inert gas such as nitrogen, argon, or helium.
- heating temperature 950 to 1000 ° C.
- heating time 3.5 to 4 minutes.
- the bonding step is a reducing atmosphere, it can be heated using a burner.
- the heating temperature is preferably 1000 to 1200 ° C. and the heating time is 5 to 10 seconds.
- the thickness of the ion diffusion layer can be reduced to 15 ⁇ m or less by heating under the above conditions.
- voids existing in the oxide film can be reduced by this heating.
- this heating can reduce and remove the oxide film at the portion not covered with the glass portion in the lead portion.
- the electrode member of the present invention having the above-described lead portion, electrode portion, and optionally glass portion can be suitably used as a constituent member of a cold cathode fluorescent lamp.
- a glass tube provided with a phosphor layer on the inner wall surface is prepared, an electrode member is inserted into one opening of the glass tube, and a lead portion (glass portion) is disposed in the vicinity of the opening.
- the contact portion with the lead portion if the electrode member has a glass portion, the glass tube is contacted with the glass portion and the glass portion) is heated to melt the glass and seal the opening.
- the electrode member is fixed.
- a predetermined gas is introduced into the glass tube, another electrode member is inserted into the other opening, and a lead portion (glass portion) in the vicinity of this opening Place.
- the contact portion with the lead portion when the electrode member has a glass portion, the glass tube is contacted with the glass portion and the glass portion, to melt the glass and seal the glass tube
- the electrode member is fixed to the glass tube.
- the electrode member for a cold cathode fluorescent lamp of the present invention can sufficiently adhere the lead portion and the glass. Therefore, when a cold cathode fluorescent lamp is formed using the electrode member of the present invention, constituent members from the lead wire to the glass tube can be sufficiently adhered to each other, and gas leakage from the sealed portion in the glass tube can be prevented. Therefore, the electrode member of the present invention is expected to contribute to extending the life of the fluorescent lamp.
- Electrode member 11 Electrode part 12 Lead part 12i Inner lead part 12o Outer lead part 12s Oxide film 13 Glass part 100 Alternative member 120 Inner lead part 130 Glass part 200 Jig
- FIG. 1 is a partial cross-sectional view showing a schematic configuration of an electrode member.
- the electrode member 10 includes a cup-shaped electrode part 11, a lead part 12 joined to the bottom part of the electrode part 11, and a glass part 13 joined to the outer periphery of the lead part 12.
- the lead part 12 includes an inner lead part 12i joined to a glass tube of a cold cathode fluorescent lamp and an outer lead part 12o arranged to be exposed outside the tube.
- the inner lead portion 12i includes an oxide film 12s at a location covered with the glass portion 13 on the surface thereof.
- Such an electrode member was produced as follows.
- Example> 1 Formation of electrode part and lead part As the electrode part 11, a nickel plate was formed into a cup shape by press working.
- the lead portion 12 is one end surface of a wire (diameter ⁇ 0.8 mm) made of Kovar (Ni: 28 to 30% by mass, Co: 16 to 18% by mass, balance Fe), and a wire made of a nickel alloy (MnNi). It was formed by welding the end face.
- the Kovar wire portion is the inner lead portion 12i, and the nickel alloy wire portion is the outer lead portion 12o.
- a welding bump (not shown) was formed at the joint between the two wires.
- the obtained lead portion 12 was subjected to surface treatment such as barrel polishing and chemical polishing. A plurality of such lead portions were prepared.
- the outer periphery of the inner lead portion 12i (the outer periphery on the inner lead portion side of the welding bump) was heated to form an oxide film 12s on the surface of the inner lead portion 12i. Heating was performed in two stages as follows. (1) Oxidizing step Heating was performed in an air atmosphere using an electric furnace at a heating temperature of 800 ° C. and a heating time of 4 minutes. (2) Non-oxidizing step Subsequently, heating was performed in a nitrogen atmosphere using an electric furnace at a heating temperature of 980 ° C. and a heating time of 4 minutes, and then cooled.
- the ratio (volume ratio) of the compounds constituting the oxide film formed on the lead portion was examined.
- the measurement was performed with XRD.
- FeO was detected in all the lead portions, 90% by volume was FeO, and the remainder was Fe 3 O 4 and Fe 2 O 3 .
- the thickness of the oxide film formed on the lead portion was examined, it was 2.8 to 3.7 ⁇ m.
- the thickness of the oxide film was measured using a micrograph. Furthermore, when the state of the oxide film was confirmed with a microscope, it had many voids.
- a glass bead is a hollow cylindrical body made of borosilicate glass (BFK) containing SiO 2 as a main component and containing Na 2 O or the like, and has a through-hole on an end surface.
- the through hole is slightly larger than the outer diameter of the inner lead portion 12i. Therefore, when the glass beads are inserted into the inner lead portion 12i, a gap is generated between the inner peripheral surface of the glass beads and the outer peripheral surface of the inner lead portion 12i.
- the glass beads are easily positioned at a predetermined position in the longitudinal direction of the inner lead portion 12i by the welding bump when inserted into the inner lead portion 12i.
- the bottom surface of the cup-like electrode part 11 was joined to the other end face (the face without the welding bump) of the inner lead part 12i by laser welding.
- the inner lead part 12i is heated by the heating when joining the electrode part, and the constituent elements of the oxide film are changed. Diffusion to the glass side can be suppressed.
- the joining of the electrode portions can also be performed after melting glass beads described later.
- An electrode member having an electrode portion, a lead portion, and a glass portion was obtained by the steps 1 to 4 described above. A plurality of such electrode members are produced, and these electrode members are used as examples. Regarding the examples, the ratio of the compounds constituting the oxide film was examined by XRD. As a result, each electrode member contained 1% or more of FeO by volume ratio, and the remainder was Fe 3 O 4 and Fe 2 O 3 . there were.
- the thickness of the oxide film was measured using a photomicrograph and found to be 1.4 to 2.5 ⁇ m, which was thinner than the thickness of the oxide film formed on the lead portion.
- the state of the oxide film of the example was confirmed with a microscope, the voids were reduced.
- the thickness of the ion diffusion layer was measured using a micrograph, and it was 6.2 to 7.2 ⁇ m, which was very thin, 15 ⁇ m or less.
- ⁇ Comparative example> An electrode member on which an oxide film was formed under conditions different from those of the above example was produced.
- the oxide film was formed by one-step heating without performing two-step heating.
- the specific conditions were an electric furnace, an air atmosphere, a heating temperature: 800 ° C., and a heating time: 4 minutes. Steps other than the formation of the oxide film are performed in the same manner as in the above-described embodiment to produce a plurality of electrode members, and these electrode members are used as comparative examples.
- the ratio of the compounds constituting the oxide film in the comparative example was examined by XRD. As a result, no FeO was detected in any electrode member, and only Fe 3 O 4 and Fe 2 O 3 were detected. Further, the thickness of the oxide film of the comparative example was 3 to 5 ⁇ m, and the thickness of the ion diffusion layer was 6 to 7 ⁇ m, which was 15 ⁇ m or less.
- the inner lead part was made of W (tungsten), and an electrode member provided with a glass part was made.
- the glass part and the glass tube used for the reference example were assumed to have a thermal expansion coefficient close to W.
- a plurality of such electrode members are manufactured, and these electrode members are used as reference examples.
- the bonding strength between the glass and the lead portion was examined as follows. As shown in FIG. 2, the bonding strength is such that the lead part can be inserted and the electrode member is fixed to a jig 200 having a through hole of a size that the glass part cannot be inserted, and a load is applied to the outer lead part. When pulled, the force (N) at which the glass part broke was examined. In the example, since the outer lead portion breaks before the glass portion breaks, an alternative member 100 in which the glass portion 130 is formed on the inner lead portion 120 is produced under the same conditions, and the bonding strength is obtained using the alternative member 100. I investigated. The results are shown in Table 1.
- the example is excellent in the bonding strength between the glass and the lead part. Therefore, when a cold cathode fluorescent lamp is formed using such an electrode member, constituent members between the lead portion and the glass tube can sufficiently adhere, and gas leaks from the sealing portion of the glass tube. Is expected to be prevented.
- Example lamp An endurance test
- Cold cathode fluorescent lamps were produced using the electrode members of the examples and comparative examples, and durability tests were performed.
- the cold cathode fluorescent lamp uses an I-shaped glass tube having two openings, the electrode members of the examples are arranged in each opening to heat the glass, seal the openings, and lead parts (Example lamp).
- Example lamp In the glass tube, a halophosphate phosphor layer was previously formed as a phosphor layer on the inner wall surface.
- the mixed gas of mercury and argon was introduce
- a comparative lamp using the electrode member of the comparative example was produced in the same manner.
- the durability test was performed on the obtained example lamp and comparative example lamp.
- the brightness of the cold cathode fluorescent lamp greatly deteriorates in 1000 hours (initial 1000 hours) from the start of lighting (initial), and the deterioration thereafter is small. Therefore, the initial luminance value is set to 100%, and if the luminance after 1000 hours is 80% or more of the initial luminance, it is evaluated as having durability.
- the example lamp was 93%, and it was found that there was no problem in durability.
- the comparative lamp was 65%. Further, the comparative example lamp detected a gas leak during lighting, while the example lamp had no gas leak.
- the example lamp became durable because the constituent members between the lead wire and the glass tube were sufficiently adhered to each other, and the gas in the glass tube was sufficiently present. It is believed that there is. Moreover, since it is excellent in durability, the Example lamp is considered to have a long life.
- the electrode member of the present invention can be suitably used as a constituent member of a cold cathode fluorescent lamp.
- the manufacturing method of the electrode member of the present invention can be suitably used for manufacturing the electrode member of the present invention.
- the cold cathode fluorescent lamp using the electrode member of the present invention includes various light sources such as a backlight light source for a liquid crystal display, a front light source for a small display, a document irradiation light source such as a copying machine or a scanner, and an eraser light source for a copying machine. It can be suitably used as a light source for electrical equipment.
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Abstract
Description
特許文献1には、リード線に酸化膜を形成することで、リード線とガラスビーズとの濡れ性を高め、ガラス管の気密性を高められることが記載されている。しかし、従来の酸化膜は、ガラスビーズとの密着が十分とは言えず、接合強度の更なる向上が望まれる。リード線とガラスビーズとが十分に密着していないと、リード線からガラス管までの間の構成部材同士が密着できず、ガラス管の封止部分に空隙ができる。この空隙からガラス管内のガスが漏洩する恐れがある。ガスが漏洩すると、例えば、発光に必要な紫外線が十分に放射されなくなり、蛍光ランプの寿命が短くなる。
[酸化膜形成工程] リード部の外周を加熱し、リード部の表面に酸化膜を形成する。リード部は、少なくとも表面側が鉄含有金属から構成されるものとする。そして、この工程は、以下に示す雰囲気が異なる二工程を具える。
<酸化性工程> 酸化性雰囲気でリード部を加熱して酸化膜を形成する。
<非酸化性工程> 酸化性工程後に非酸化性雰囲気でリード部を加熱して、酸化膜中にFeOを生成する。
[ガラス部形成工程] 酸化膜が形成されたリード部の外周にガラスビーズを配置し、ガラスビーズを加熱して変形することでガラス部を形成すると共に、ガラス部をリード部に接合する。
[変形工程] 非酸化性雰囲気中で、加熱温度:700~800℃、加熱時間:3~5分
[接合工程] 還元性雰囲気中で、加熱温度:900~1100℃、加熱時間:3~5分
12o アウターリード部 12s 酸化膜 13 ガラス部
100 代替部材 120 インナーリード部 130 ガラス部 200 治具
[電極部材]
図1は、電極部材の概略構成を示す部分断面図である。作製した電極部材は、いずれも図1に示す電極部材10と同様の構成である。電極部材10は、カップ状の電極部11と、電極部11の底部に接合されるリード部12と、リード部12の外周に接合されるガラス部13とを具える。リード部12は、冷陰極蛍光ランプのガラス管に接合されるインナーリード部12iと、管の外部に露出して配されるアウターリード部12oとからなる。インナーリード部12iは、その表面においてガラス部13で覆われる箇所に酸化膜12sを具える。このような電極部材は、以下のように作製した。
1.電極部及びリード部の形成
電極部11は、ニッケル板をプレス加工によりカップ状に形成した。リード部12は、コバール(Ni:28~30質量%、Co:16~18質量%、残部Fe)からなる線材(直径φ0.8mm)の一端面と、ニッケル合金(MnNi)からなる線材の一端面とを溶接して形成した。コバール線材部分がインナーリード部12iであり、ニッケル合金線材部分がアウターリード部12oである。両線材の接合部分には、溶接コブ(図示せず)を形成した。得られたリード部12にバレル研磨、化学研磨などの表面処理を行った。このようなリード部を複数用意した。
インナーリード部12iの外周(溶接コブよりもインナーリード部側の外周)を加熱し、インナーリード部12iの表面に酸化膜12sを形成した。加熱は、以下のように二段階に亘って行った。
(1) 酸化性工程
電気炉を用いて大気雰囲気で、加熱温度:800℃、加熱時間:4分で加熱した。
(2) 非酸化性工程
引き続いて電気炉を用いて窒素雰囲気で、加熱温度:980℃、加熱時間:4分で加熱した後、冷却した。
インナーリード部12iの他端面(溶接コブが無い側の面)に、カップ状の電極部11の底面をレーザー溶接で接合した。ガラスビーズの溶融前(ガラス部形成前)に電極部11をリード部12に接合することで、電極部を接合するときの加熱により、インナーリード部12iが加熱されて、酸化膜の構成元素がガラス側に拡散することを抑制できる。電極部の接合は、後述するガラスビーズの溶融後に行うこともできる。
(1) 変形工程
電極部11を接合し、ガラスビーズを配置したリード部12を電気炉に配置し、窒素雰囲気中で加熱温度:800℃、加熱時間:4分で加熱して、ガラスビーズを変形させると共に、酸化膜に付着させた。具体的には、ガラスビーズは、加熱により角部が丸まると共に、収縮するように変形し、貫通孔の内周面が酸化膜に付着する。この変形により、ガラスビーズからガラス部13を形成する。
(2) 接合工程
電気炉中に水素ガスを混入して、(窒素+水素)雰囲気とし(水素割合:16体積%)、この還元性雰囲気中で加熱温度:980℃、加熱時間:4分で加熱して、ガラス部13と酸化膜12sとを密着させる。つまり、酸化膜12sの一部をガラス部13に拡散させる。また、この加熱により、インナーリード部12iにおいて、ガラス部13で覆われず、露出した部分の酸化膜を還元して除去する。
上記実施例と異なる条件で酸化膜を形成した電極部材を作製した。この電極部材において酸化膜は、二段階の加熱を行わず、一段階の加熱で形成した。具体的な条件は、電気炉を用い、大気雰囲気で、加熱温度:800℃、加熱時間:4分とした。酸化膜の形成以外の工程は、上記実施例と同様に行って電極部材を複数作製し、これらの電極部材を比較例とする。
インナーリード部をW(タングステン)で作製し、ガラス部を設けた電極部材を作製した。参考例に用いたガラス部及びガラス管は、Wに熱膨張係数が近いものとした。このような電極部材を複数作製し、これらの電極部材を参考例とする。
実施例,比較例,参考例について、以下のようにしてガラスとリード部との接合強度を調べた。接合強度は、図2に示すようにリード部が挿通可能で、ガラス部が挿通不可能な大きさの貫通孔を設けた治具200に電極部材を固定し、アウターリード部を荷重を加えて引っ張った際、ガラス部が破壊するときの力(N)を調べた。実施例は、ガラス部が破壊する前にアウターリード部が破断するため、インナーリード部120にガラス部130を形成した代替部材100を同様の条件で作製し、この代替部材100を用いて接合強度を調べた。その結果を表1に示す。
実施例,比較例について、インナーリード部に曲げを加えて、ガラス部の割れ状態を調べた。その結果、比較例は、リード部からガラス部の破片が脱落するように割れた。これに対し、実施例は、リード部からガラス部が剥がれて破片が脱落するように割れたりせず、リード部に付着していて形が残っていたが、ガラス部の径方向にひびが多数生じていた。このことから、実施例は、ガラス部がリード部の外周に沿って満遍なくが密着していると考えられる。
実施例,比較例の電極部材を用いて、冷陰極蛍光ランプを作製し、耐久試験を行った。冷陰極蛍光ランプは、開口部を二つ有するI字状のガラス管を用い、各開口部に実施例の電極部材をそれぞれ配置してガラスを加熱し、開口部を封止すると共に、リード部を固定して作製した(実施例ランプ)。ガラス管には、内壁面に蛍光体層としてハロリン酸塩蛍光体層を予め形成した。また、一方の開口部を封止する際、真空引きした後、ガラス管内に水銀とアルゴンとの混合ガスを導入した。比較例の電極部材を用いた比較例ランプも同様にして作製した。
Claims (5)
- 電極部と、電極部の端部に接続されるリード部とを有する冷陰極蛍光ランプ用電極部材であって、
リード部は、
少なくとも表面側が鉄含有金属から構成され、
このリード部の表面の少なくとも一部に酸化膜を有しており、
酸化膜は、FeOを含むことを特徴とする冷陰極蛍光ランプ用電極部材。 - 酸化膜中のFeOの含有量は、体積比で1%以上であることを特徴とする請求の範囲第1項に記載の冷陰極蛍光ランプ用電極部材。
- 電極部材は、更に、リード部の外周に接合されるガラス部を具え、
リード部の表面においてガラス部で覆われる箇所に酸化膜を有することを特徴とする請求の範囲第1項に記載の冷陰極蛍光ランプ用電極部材。 - 電極部の端部にリード部を有する冷陰極蛍光ランプ用電極部材の製造方法であって、
少なくとも表面側が鉄含有金属から構成されるリード部の外周を加熱し、リード部の表面に酸化膜を形成する酸化膜形成工程を具え、
酸化膜形成工程は、酸化性工程と、非酸化性工程とを具え、
酸化性工程は、酸化性雰囲気でリード部を加熱して酸化膜を形成し、非酸化性工程は、酸化性工程後に非酸化性雰囲気でリード部を加熱して、酸化膜中にFeOを生成することを特徴とする冷陰極蛍光ランプ用電極部材の製造方法。 - 更に、リード部の外周に接合されるガラス部を有する電極部材を作製する場合、酸化膜が形成されたリード部の外周にガラスビーズを配置し、ガラスビーズを加熱して変形することでガラス部を形成すると共に、ガラス部をリード部に接合するガラス部形成工程を具えることを特徴とする請求の範囲第4項に記載の冷陰極蛍光ランプ用電極部材の製造方法。
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KR1020097009073A KR101037332B1 (ko) | 2008-04-17 | 2008-04-17 | 냉음극 형광 램프, 냉음극 형광 램프를 구비하는 전기 기기 광원, 전기 기기 광원을 구비하는 액정 표시 장치 및, 냉음극 형광 램프용 전극 부재 |
KR1020097009002A KR100933492B1 (ko) | 2008-04-17 | 2008-04-17 | 냉음극 형광 램프용 전극 부재 및 그의 제조 방법 |
PCT/JP2008/001010 WO2009128118A1 (ja) | 2008-04-17 | 2008-04-17 | 冷陰極蛍光ランプ用電極部材 |
JP2010508036A JP5093932B2 (ja) | 2008-04-17 | 2008-04-17 | 冷陰極蛍光ランプ、電気機器光源、液晶表示装置、及び冷陰極蛍光ランプ用電極部材 |
US12/937,506 US20110027586A1 (en) | 2008-04-17 | 2008-04-17 | Electrode member for cold cathode fluorescent lamp |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH043969A (ja) * | 1990-04-20 | 1992-01-08 | Sumitomo Electric Ind Ltd | 気密端子用リード線およびその製造方法 |
JPH11238489A (ja) * | 1998-02-20 | 1999-08-31 | Harison Electric Co Ltd | ランプおよび照明装置 |
JP2008130395A (ja) * | 2006-11-21 | 2008-06-05 | Sumitomo Electric Ind Ltd | 冷陰極蛍光ランプ用電極部材組 |
JP2008130396A (ja) * | 2006-11-21 | 2008-06-05 | Sumitomo Electric Ind Ltd | 冷陰極蛍光ランプ用電極部材 |
Family Cites Families (3)
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JPH08111210A (ja) * | 1994-10-07 | 1996-04-30 | Stanley Electric Co Ltd | 冷陰極蛍光灯 |
DE29703990U1 (de) * | 1997-03-05 | 1997-04-17 | Thielen Marcus Dipl Phys | Kalte Elektrode für Gasentladungen |
JP2003229060A (ja) * | 2002-02-01 | 2003-08-15 | Toshiba Shomei Precision Kk | 冷陰極ランプ用導入線の製造方法、冷陰極ランプの製造方法、冷陰極ランプ用導入線、及び冷陰極ランプ |
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- 2008-04-17 WO PCT/JP2008/001010 patent/WO2009128118A1/ja active Application Filing
- 2008-04-17 KR KR1020097009073A patent/KR101037332B1/ko not_active IP Right Cessation
- 2008-04-17 US US12/937,506 patent/US20110027586A1/en not_active Abandoned
- 2008-04-17 KR KR1020097009002A patent/KR100933492B1/ko not_active IP Right Cessation
- 2008-04-17 JP JP2010508036A patent/JP5093932B2/ja not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH043969A (ja) * | 1990-04-20 | 1992-01-08 | Sumitomo Electric Ind Ltd | 気密端子用リード線およびその製造方法 |
JPH11238489A (ja) * | 1998-02-20 | 1999-08-31 | Harison Electric Co Ltd | ランプおよび照明装置 |
JP2008130395A (ja) * | 2006-11-21 | 2008-06-05 | Sumitomo Electric Ind Ltd | 冷陰極蛍光ランプ用電極部材組 |
JP2008130396A (ja) * | 2006-11-21 | 2008-06-05 | Sumitomo Electric Ind Ltd | 冷陰極蛍光ランプ用電極部材 |
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JPWO2009128118A1 (ja) | 2011-08-04 |
KR20090113819A (ko) | 2009-11-02 |
KR20100123796A (ko) | 2010-11-25 |
JP5093932B2 (ja) | 2012-12-12 |
KR100933492B1 (ko) | 2009-12-23 |
US20110027586A1 (en) | 2011-02-03 |
KR101037332B1 (ko) | 2011-05-26 |
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