CN101645389B - Cold cathode fluorescence lamp and manufacturing method thereof - Google Patents
Cold cathode fluorescence lamp and manufacturing method thereof Download PDFInfo
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- CN101645389B CN101645389B CN2009101660116A CN200910166011A CN101645389B CN 101645389 B CN101645389 B CN 101645389B CN 2009101660116 A CN2009101660116 A CN 2009101660116A CN 200910166011 A CN200910166011 A CN 200910166011A CN 101645389 B CN101645389 B CN 101645389B
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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
- H01J61/0675—Main electrodes for low-pressure discharge lamps characterised by the material of the 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
- H01J61/04—Electrodes; Screens; Shields
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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
- H01J61/0672—Main electrodes for low-pressure discharge lamps characterised by the construction of the 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
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
- H01J61/09—Hollow cathodes
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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
- H01J61/38—Devices for influencing the colour or wavelength of the light
- H01J61/42—Devices for influencing the colour or wavelength of the light by transforming the wavelength of the light by luminescence
- H01J61/44—Devices characterised by the luminescent material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
- H01J61/76—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a filling of permanent gas or gases only
- H01J61/78—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a filling of permanent gas or gases only with cold cathode; with cathode heated only by discharge, e.g. high-tension lamp for advertising
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Abstract
The invention provides a cold cathode fluorescence lamp and a manufacturing method thereof. The cold cathode fluorescence lamp of the invention comprises electrodes, each of which has excellent sputtering resistance with strong exerted current, almost forms no amalgam with small damage to environment, can be easily manufactured and can provide an actual level work with long service life. The cold cathode fluorescence lamp of the invention further comprises a transparent tube which is provided with a fluorescence layer disposed on the inner wall surface, contains inert gas and mercury and the two ends of the transparent tube are sealed by a sealing element. Furthermore, the invention comprises an electrode which is disposed nearby two ends in the transparent tube and a lead which is connected to the electrode and passes through the sealing element. Each electrode is made of ferrous material or ferroalloy material. The ferrous material or ferroalloy material has an average diameter of 4.9 microns or a micro-structure formed by smaller ferrous or ferroalloy grain crystal.
Description
The present invention carries out according to the desired priority of Japanese patent application No.2008-204565, and incorporates the full content described in mother's application into this paper.
Technical field
The method that the present invention relates to a kind of cold-cathode fluorescence lamp and be used to make this cold-cathode fluorescence lamp; And more specifically; Relate to a kind of sputter repellence (sputteringresistance) through improving electrode even if make and applying the cold-cathode fluorescence lamp that its life-span is extended equally under the situation of big tube current, and the method that is used to make this cold-cathode fluorescence lamp.
Background technology
The characteristics of cold-cathode fluorescence lamp are that brightness is big, color rendering is good, the life-span is long, the power consumption low and other character; Therefore; It is used as the reading image light source in employed backlight, the facsimile machine and other similar device, the eraser light source in the photocopier in television set, computer and other liquid crystal indicator usually, and is used for various demonstration purposes.The operation principle of this type of cold-cathode fluorescence lamp is following: voltage is put near the electrode that is arranged on the transparent tube two ends, and this transparent tube is processed by glass or other any suitable material, and comprises inert gas and mercury with air tight manner in it.The little electrons that is present in the transparent tube that is applied in voltage makes ionized inert gas.When the ionization inert gas impinges upon on the electrode, the emission secondary electron, thus glow discharge takes place.Mercury through glow discharge irradiation is able to excite and sends ultraviolet light.When the fluorescent material on being present in the transparent tube inwall received ultraviolet light, this fluorescent material sent visible light.
The electrode of this type of cold-cathode fluorescence lamp is a cup-shaped, because this can reduce tube voltage and power consumption, and is arranged in the two ends of transparent tube with the opening of cup-shape electrode mode respect to one another.The reason that electrode is processed by nickel is: melt temperature is low; Machinability is good; Sputter repellence to mercury ion, inert gas ion and other material is good; Good with the solderability of the kovar alloy that is used as encapsulant usually (Kovar) and other similar material, and good to the durability under the tube current between the 5mA between 4mA.But in the cold-cathode fluorescence lamp in the back light unit of the large-screen of television set recently, high brightness liquid crystal indicator; Nickel replaces the raw material as electrode by molybdenum or niobium, its reason be electrode requirement 5mA or bigger tube current under durability, to the good sputter repellence of heavy load, hang down work function and low discharge starting voltage (Japanese Patent Laid is opened No.2004-355971).
But molybdenum and niobium have the high-melting-point of 2622 ℃ and 1950 ℃ respectively, and are difficult to make fully this type of refractory metal of fusion to produce the heating furnace of electrode.In addition, molybdenum and niobium itself is very expensive, and durable heating furnace is also very expensive under their fusing point.Therefore, very expensive by above-mentioned any metal electrode.For overcoming this problem, process and make electrode being lower than under the temperature of its fusing point (for example about 1800 ℃) ingot casting that above-mentioned any metal is processed through sintering or metal wire usually.But, utilize through having a kind of like this structure being lower than the electrode that melt raw material forms under the temperature of fusing point ingot casting or metal wire make, that is, the raw material particle is through the particle edges bonding and keep.Therefore, when being heated with oxidation in the manufacture process of the surface of electrode at cold-cathode fluorescence lamp, the cohesive force between the raw material particle weakens.In the cold-cathode fluorescence lamp of the electrode that comprises manufacturing like this, mercury ion and inert gas ion be the particle edges between the selectivity sputter particle unfriendly.Therefore, the employed electrode of being processed by molybdenum or niobium does not have the sputter repellence in existing cold-cathode fluorescence lamp, and in fact unreliable.
In addition; Although molybdenum and niobium are superior to nickel in the sputter repellence aspect to mercury ion and inert gas ion and other material; But can be consumed the mercury of introducing transparent tube unfriendly by the molybdenum of sputter and niobium; Its reason is run duration and the mercury reaction at lamp of molybdenum and niobium, and forms and can not promote luminous mercury alloy, and this situation with nickel is identical.Therefore, the amount of introducing the mercury of transparent tube be necessary for be used for luminous mercury amount add the amount that forms the mercury that mercury alloy consumed.In recent years, equally from the angle of environmental problem, it is desirable to the feasible amount minimum of introducing the mercury of transparent tube.Therefore, need when the electrode sputter, can reduce to form the electrode material of the amount of mercury alloy.
The example that does not form the main material of mercury alloy with mercury reaction comprises iron, tungsten and manganese.But the fusing point of tungsten is high, and the electrode of being processed by sintered tungsten is therefore and very expensive, and in fact inapplicable.Manganese in fact also is inapplicable as the main component of electrode.In fact iron be applicable to electrode material.For example, being commonly referred to as the very high and phosphorus content of pure iron and its iron-holder, to reach the material of about 0.02 quality % close or littler with the sputter repellence of nickel to the sputter repellence of mercury ion and ne ion, therefore, must improve the sputter repellence of pure iron.
Japanese Patent Laid is opened No.2005-183172 and has been delivered a kind of discharge lamp; It comprises electrode; Each electrode comprises by at least a one deck of processing of nickel, stainless steel, iron, aluminium or copper and another layer or other any suitable setting material above that processed by tungsten, molybdenum, niobium; And this discharge lamp has good emitter and keeps performance, and the life-span is long.Japanese Patent Laid is opened No.2005-327485 and Japanese Patent Laid and is opened No.2006-073307 and delivered the cold-cathode fluorescence lamp with ad hoc structure, and said ad hoc structure is similar to Japanese Patent Laid and opens the two-layer structure described in the No.2005-183172.But because the molybdenum, niobium and other material that use in the surface of each electrode, these discharge lamps are actually in-problem.
Summary of the invention
The purpose of this invention is to provide a kind of cold-cathode fluorescence lamp; It comprises electrode; Even if each electrode also has good sputter repellence applying under the situation of big tube current, form mercury alloy hardly, the burden that environment is caused is little; Can easily make with low cost, and so that long-life realistic scale work to be provided.
The inventor has done deep research; Even and if the electrode of finding mainly to be processed by iron or ferroalloy materials is in that to apply under the situation of big electric current the sputter repellence also fine; And form mercury alloy when in cold-cathode fluorescence lamp, using this electrode hardly, it is the micro-structural that 4.9 μ m or littler iron or ferroalloy crystal grain constitute that above-mentioned iron or ferroalloy materials have by average diameter.The present invention is achieved based on above-mentioned discovery.
That is to say that the present invention relates to a kind of cold-cathode fluorescence lamp, it comprises: transparent tube comprises the fluorescence coating that is arranged on the internal face, and comprises inert gas and mercury that the two ends of this transparent tube are airtight by seal member; Electrode, be arranged on the transparent tube two ends near; And lead-in wire, be connected to electrode and pass seal member, wherein each electrode is processed by iron or ferroalloy materials, and it is the micro-structural that 4.9 μ m or littler iron or ferroalloy crystal grain constitute that this iron or ferroalloy materials have by average diameter.
That is to say that the present invention relates to a kind of method that is used to make the cold-cathode fluorescence lamp that is consistent with above-mentioned cold-cathode fluorescence lamp, this method comprises: form the foundry goods of processing by iron or ferroalloy materials; And forge or rolling foundry goods through on a plurality of directions, being out of shape, with the electrode that formation has micro-structural, this micro-structural is that 4.9 μ m or littler iron or ferroalloy crystal grain constitute by average diameter.
Cold-cathode fluorescence lamp of the present invention comprises electrode; Even if each electrode also has good sputter repellence applying under the situation of big tube current, form mercury alloy hardly, the burden that environment is caused is little; Can easily make with low cost, and so that long-life realistic scale work to be provided.
Description of drawings
Fig. 1 shows the schematic configuration figure of the example of cold-cathode fluorescence lamp of the present invention; And
Fig. 2 shows the perspective view of electrode of the example of cold-cathode fluorescence lamp of the present invention.
Denotational description
1 cold-cathode fluorescence lamp
2 glass tubes (transparent tube)
3 beades
4 fluorescence coatings
5 inner spaces
7 electrodes
8 bottoms
9 lead-in wires
10 openings
Embodiment
Cold-cathode fluorescence lamp of the present invention comprises: transparent tube comprises the fluorescence coating that is arranged on the internal face, and comprises inert gas and mercury that the two ends of this transparent tube are airtight by seal member; Electrode is arranged near the two ends of transparent tube; And lead-in wire, be connected to electrode and pass seal member.Each electrode is processed by iron or ferroalloy materials, and it is the micro-structural that 4.9 μ m or littler iron or ferroalloy crystal grain constitute that this iron or ferroalloy materials have by average diameter.
Employed transparent tube can be processed by other any material of silicate glass, borosilicate glass, zinc borosilicate glass, lead glass, soda-lime glass or visible light transmissive in the cold-cathode fluorescence lamp of the present invention.Above-mentioned transparent tube can have rectilinear form, curve shape or other any suitable shape.The diameter of this pipe can be a virtually any size, for example between 1.5mm between the 6.0mm.Can come suitably to select the thickness of transparent tube according to intended purposes, but when adopting above-mentioned bore diameter, this thickness is preferably between 0.15mm between the 0.60mm.
Fluorescence coating is arranged on basically on the whole internal face of transparent tube.Fluorescence coating comprises fluorescent material, the ultraviolet excitation that this fluorescent material is sent by mercury (after a while with described), and send visible light.Can select to send any fluorescent material of required wavelength light.This type of fluorescent material can be halogenated phosphate (halophosphate), rare earth compound and other fluorescent material that is suitable for.The appropriate combination of above fluorescent material can be used for launching white light.The thickness of fluorescence coating is preferably between 11 μ m to (comprising 11 μ m and 35 μ m) between the 35 μ m.
The inert gas introducing transparent tube that will when applying discharge, produce the mercury of ultraviolet light and suitably be selected from argon, xenon, neon and other suitable element.Discharge electronics that is produced in the transparent tube and mercury atom collision produce 253.7nm and other wavelength ultraviolet light, and this is the fluorescence excitation material again.The mercury of preferably confirm introducing in the following manner and the amount of inert gas: promptly for example between between the 1Pa to 10Pa, and the pressure of inert gas is for example between between the 5000Pa to 11000Pa at the run duration of fluorescent lamp for the steam pressure of mercury.
Each electrode that is arranged on the place, two ends in the transparent tube is processed by iron or ferroalloy materials (hereinafter being referred to as electrode material sometimes), and it is the micro-structural that 4.9 μ m or littler iron or ferroalloy crystal grain constitute that said iron or ferroalloy materials have by average diameter.Electrode material can only comprise iron, but preferably comprises carbon.The above-mentioned fusing point that mainly comprises the electrode material of iron is lower than the material that contains molybdenum, niobium or other element, and the carbon that is comprised further reduces fusing point.Therefore can at a lower temperature lead-in wire be connected to electrode, can reduce the deterioration of lead-in wire during attended operation whereby.For example by kovar alloy (Kovar) when processing, the fusing point of electrode material is close with the fusing point of kovar alloy at lead-in wire.Electrode material has micro-structural equally.Therefore formed electrode also has good sputter repellence when applying the big tube current of 12mA for example.
The average diameter of the crystal grain in the electrode can decide according to the particle diameter of confirming through comparison method, and in this comparison method, light microscope is used to observe the electrode surface that has received acid etching.Particularly; Compile according to Japanese heat treatment technics association (The Japan Society for Heat TreatmentTechnology), and carry out above-mentioned comparison method by the method that the 189-193 page or leaf in " An Introduction to MetallicMaterials and Textures (metal material and tissue general introduction) " book of Taiga publishing house publication is described.Particularly, under light microscope, be that the practical field of view of 0.8mm is amplified in the circle of 80 mm dias on 100 times of micrographs that obtain with diameter, crystal grain that this circle is interior and the crystal grain in the standard drawing are made comparisons, to find out the particle size number of correspondence.Obtain mean particle diameter thus.For example, when the particle with average diameter in the electrode image that utilizes light microscope to obtain corresponding to size number was 5 particle, average grain diameter was 4.9 μ m.
Electrode material obtains through the fused mass that cools off main iron content or ferroalloy.When the electrode material carbon containing, the carbon that is present in iron or the ferroalloy is solid solution (ferrite, austenite and martensite), blacklead (graphite) or cementite (cementite).Graphite is the carbon mineral with hexagonal crystalline phase, and cementite is cementite Fe
3C, wherein iron and carbon mutually combine.The solid solution that discuss in this place is interstitial solid solution, and wherein, the track of carbon atom penetrates the gap between the iron atom in lattice.Rock-steady structure under the interstitial solid solution high temperature is austenite (centroid cubic lattice structure), and rock-steady structure at room temperature is ferrite (a body-centered cubic lattic structure).When the high temperature solid solution body with austenitic structure stands quick cooling (quenching), can obtain stone but frangible martensite (body-centered cubic lattic structure).When formed martensite is heated again, keep heated condition to continue the fixedly period, then it is carried out slow cool down (tempering), thereby obtain highly plastic tempered martensite.The carbon atom that is contained in the electrode material adopts the form of solid solution, graphite or cementite to depend on following condition: thickness and other condition of the cooldown rate (period) that the fused mass of iron content or ferroalloy is cooled off, the existence that is contained in other atom in iron or the ferroalloy, carbon content, the foundry goods that obtains through the cooling fused mass.The above-mentioned condition of scalable is so that electrode material comprises the carbon of desired form.
Electrode material preferably comprises carbide particle in iron or ferroalloy crystal grain, particularly, be cementite (cementite) particle.The scope of the phosphorus content in the electrode material be preferably from more than the 0.08 quality % below 1.4 quality %, more preferably from more than the 0.18 quality % below 0.68 quality %.When the phosphorus content in the electrode material was in this scope, carbon atom tended to be attached to iron, and formed cementite, and electrode material good fluidity when being melted, and when being cooled, this electrode material has the hardness that makes it be easy to process.In addition, even if formed electrode also has good sputter repellence when applying the electric current that is higher than 12mA.Prolong the life-span of cold-cathode fluorescence lamp thus.
The average diameter of cementite particle is preferably 95nm or littler.Can be with through using the mean particle diameter that obtains with the similar method of method that is used to measure above-mentioned micro-structural diameter as the cementite particle.
Above-mentioned electrode material preferably comprises one or more in molybdenum, manganese, chromium and the silicon, and iron or ferroalloy.In molybdenum, manganese or the chromium any one keeps cementite to stablize, prevent that iron is oxidized, improve quenching effect, thus and the density increase hardness of increase micro-structural.In addition, manganese is attached to and is contained in the sulphur in iron or the ferroalloy and forms manganese sulfate, and the manganese that is not attached to sulphur forms the carbide that prevents to isolate blacklead.
Silicon is the element of main graphitized carbon, and decomposes cementite consumingly.Yet silicon can improve the flowability of melt electrode material.Therefore, when formed electrode has specific thickness, comprise the cooldown rate height of the electrode material of silicon, and reduced by the amount of graphited carbon.
The scope that is included in the total amount of molybdenum, manganese, chromium and silicon in the electrode material be preferably from more than the 0.3 quality % below 3.5 quality %, more preferably from more than the 0.6 quality % below 2.1 quality %.When the total content of these atoms was in this scope, the cementite that is contained in the electrode material can be stablized, and the mobile performance of melt electrode material is able to keep.Form electrode thus easily.
Can the electrode of being processed by above-mentioned electrode material for example be configured as plate, but preferred cup-shape electrode, reason is that it can reduce tube voltage and power consumption.Further preferably, with the opening of cup-shape electrode mode respect to one another with electrode be arranged on the transparent tube two ends near.Can be through forming the tabular ingot casting processed by above-mentioned electrode material, ingot casting being cut into parts and engages these parts make cup-shape electrode.Selectively, preferably through tabular ingot casting is cut into circular slab, and circular slab is pressed into the cup-shaped plate forms cup-shape electrode.Also selectively, can be through forming the metal wire processed by above-mentioned electrode material, this metal wire is cut into the metal wire sections with Len req and beats cut surface in the axial direction easily forming cup-shape electrode to form depression or cup-shaped.Above-mentioned operation is exactly so-called head processing (header working).Can come suitably to select the shape of cup in view of the power output of the internal diameter of transparent tube and lamp.For example, the external diameter of cup can be between 1.05mm between the 2.75mm, and the length of cup can be between 3mm between the 8mm.
Lead-in wire is connected to above-mentioned electrode, thereby this electrode is connected to external power source.One end of lead-in wire and the bottom weld of electrode, and the other end passes outside the seal member and outstanding sealing parts of sealed transparent Guan Yiduan.Lead-in wire preferably has a thermal endurance, the lead-in wire deterioration that heat that produces when reducing because of lead-in wire with electrode welding and the heat that when seal member closely is attached to transparent tube one end, is produced cause.In addition, lead-in wire preferably has a heat conductivity, thereby discharges transparent tube effectively in the heat that the run duration of lamp is produced in electrode.Inner in transparent tube; Lead-in wire can be formed by the kovar alloy metal wire, and this metal wire has double-decker, wherein; Copper core wire is coated with kovar alloy metal wire or other any suitable metal wire, and at outside Dumet (Dumet) metal wire or other any suitable metal wire of using of transparent tube.
Seal the seal member at the two ends of the transparent tube that comprises above-mentioned inert gas and mercury, for example rod member (stem) is used as the parts that lead-in wire passes, and these parts fix electrode through lead-in wire.Seal member for example can be formed or processed by kovar alloy by bead.
Cold-cathode fluorescence lamp of the present invention can comprise the protective layer between fluorescence coating and the transparent tube.This protective layer prevents the mercury emitted in ultraviolet light that spills from transparent tube, and prevent mercury with from the isolated substance reaction of transparent tube.Protective layer can be processed by yittrium oxide, aluminium oxide or other any suitable metal oxide.
It is ingot casting or metal wire that a kind of method that is used to make above-mentioned cold-cathode fluorescence lamp comprises the following steps: to make the foundry goods that the melted material that obtains through molten iron or ferroalloy and carbon, molybdenum, manganese, chromium, silicon or other any suitable required element processes; Through forging or rolling formed ingot casting or metal wire and on a plurality of directions, make this ingot casting or metal wire distortion, thereby form the electrode with micro-structural, this micro-structural comprises diameter average out to 4.9 μ m or littler crystal grain.Can make cold-cathode fluorescence lamp thus.
When the electrode material that will use has the phosphorus content of 96 quality % or more iron atom content and 0.5 quality %; A kind of method concrete example that is used to make above-mentioned electrode is as comprising step: the melt electrode material and carries out plastic working to formed foundry goods so that foundry goods to be provided under about 1500 ℃ temperature.Can specifically carry out plastic working as follows: on a plurality of directions, make the ingot bar distortion through forge hot or hot rolling, to form coiled material.Utilize acid that formed coiled material is cleaned, then it is annealed, thereby remove any strain, and improve malleability.When coiled material stands the hardness adjusting, it is stretched then.For example, according to the electrode that will form coiled material is configured as metal wire, this metal wire for example has between 1mm to the diameter between the 2.6mm.In addition, metal wire stands head to be handled, so that formed metal wire has needed shape, for example cylindric.
Selectively,, thereby this ingot bar is configured as the plate with a certain thickness according to the electrode that will form through forge hot, hot rolling or cold rolling and on a plurality of directions, make the ingot bar distortion, this thickness range for example between 0.1mm between the 0.2mm.Can make formed plate withstanding pressure process, thereby this plate have needed shape, for example cylindric, perhaps this plate is cut into parts, then these part bonding are formed electrode.Heating-up temperature during the plastic working is preferably between 350 ℃ to 780 ℃.
The method that is used to make above-mentioned electrode can provide the electrode with micro-structural, and this micro-structural is that 4.9 μ m or littler iron or ferroalloy crystal grain constitute by average diameter, and iron or ferroalloy crystal grain to comprise average diameter be 95nm or littler cementite particle.After the surface of formed electrode is polished, lead-in wire and electrode engagement.When using the kovar alloy metal wire, can use resistance welded or laser welding so that kovar alloy and electrode are integrated.
The dispersion liquid that makes fluorescent material be scattered in to obtain in the solvent through preparation, utilize dipping, spraying or other any suitable method that the internal face that dispersion liquid is coated to transparent tube is reached predetermined thickness; And coated dispersion liquid is carried out drying fluorescence coating is formed on the inwall of transparent tube; Above-mentioned transparent tube is processed by glass or other any suitable material, and has reservation shape.Form fluorescence coating thus with predetermined thickness.After this, can through with positioning of electrode in the two ends of transparent tube, the seal member that utilizes lead-in wire to be passed comes the two ends of sealed transparent pipe, and mercury and inert gas introducing transparent tube made cold-cathode fluorescence lamp.
As the example of cold-cathode fluorescence lamp of the present invention, can introduce backlight in the liquid crystal panel shown in Figure 1 by way of example.Be that the cold-cathode fluorescence lamp 1 shown in Fig. 1 of schematic cross sectional view comprises the glass tube of being processed by borosilicate glass 2, the two ends of this glass tube utilize the bead 3 as seal member to be sealed with air tight manner.The external diameter of glass tube 2, is preferably between 1.5mm between the 5.0mm between the 6.0mm between 1.5mm.Fluorescence coating 4 is almost along the whole length of glass tube 2 and be set on the internal face of glass tube 2.The inert gas of scheduled volume and mercury are introduced into the inner space 5 that is surrounded by the internal face of glass tube, and internal pressure roughly is reduced for ten of atmospheric pressure/several.Cup-shape electrode 7 is set at the two ends of glass tube 2 in the vertical with opening 10 modes respect to one another, and each cup-shape electrode 7 has micro-structural, and it is 4.9 μ m or littler iron or ferroalloy crystal grain that said micro-structural comprises average diameter, shown in the perspective view of Fig. 2.The lead-in wire of being processed by kovar alloy or other any suitable material 9 is connected to each cup-shape electrode 7 in the following manner: bottom 8, the other end that 9 the end of promptly going between is soldered to electrode 7 pass a corresponding bead 3 and outstanding from this bead.
Above-mentioned cold-cathode fluorescence lamp comprises electrode; Each electrode is processed by iron with micro-structural or ferroalloy materials; This micro-structural is that 4.9 μ m or littler iron or alloy grain constitute by average diameter; And particularly, each electrode comprises the carbon atom that diameter is 95nm or littler cementite particulate forms, the scope of the content of carbon atom from more than the 0.08 quality % below 1.4 quality %.Therefore, the sputter repellence of cold-cathode fluorescence lamp is good, form mercury alloy hardly, and the burden that environment is caused is little.
[example]
With reference to example the present invention is described in more detail below.
[example 1]
Fusion mixes iron with the ratio shown in the table 1 and the raw material that obtains with graphite and other element under 1400 ℃ temperature.Fused mass is injected the mould that comprises die cavity, will be immersed in the water under the room temperature at the material that under the temperature between 800 ℃ to 900 ℃, injects, and it is quenched.After this, be out of shape on a plurality of directions, to make coiled material in the forge hot processing under 500 ℃ and hot rolling processing, stretching and other processing through repetition, thereby the manufacturing diameter is approximately the metal wire of 0.2mm.Metal wire is that 1.7mm and length are the cup-shape electrode of 5mm through head processing thereby make external diameter.With diameter is that the kovar alloy metal wire of 0.8mm is soldered to the bottom of formed electrode, and it is combined with this bottom.
Utilize comparison method to come the average diameter of the iron crystal grain in the measurement electrode.The average diameter of iron crystal grain is 2 μ m.
Fluorescent material is coated on the internal face of glass tube that bore diameter is 2.0mm, and coated fluorescent material has the thickness of about 18 μ m.To be arranged at the two ends of glass tube with the electrode of kovar alloy wire welding with the opening of electrode mode respect to one another, the bead that the kovar alloy metal wire is passed is used for the two ends of sealed glass tube.Then mercury and inert gas are introduced glass tube.Make cold-cathode fluorescence lamp thus.
Formed cold-cathode fluorescence lamp moves under the tube current of 10mA, and through the check cup-shape electrode wear extent observe the sputter repellence performance.Through assessing the sputter repellence according to the wear extent of following standard test cup-shape electrode.Table 1 shows assessment result.
A: cup-shape electrode is wiping slightly.
B: cup-shape electrode weares and teares, but can make full use of.
C: cup-shape electrode weares and teares, and almost can not use.
D: cup-shape electrode degree wearing and tearing to the utmost, and can not use.
[example 2 to example 4]
Except that using the raw material shown in the table 1, to make cold-cathode fluorescence lamp with example 1 identical mode.To come to assess formed cold-cathode fluorescence lamp through the sputter repellence with example 1 identical mode.Table 1 shows assessment result.
[comparative example]
Except that using the raw material shown in the table 1, to make cold-cathode fluorescence lamp with example 1 identical method.To come to assess formed cold-cathode fluorescence lamp through the sputter repellence with example 1 identical mode.Table 1 shows assessment result.
[table 1]
| Phosphorus content (weight %) | The average diameter of crystal grain in the electrode (μ m) | The average diameter of carbide particle (nm) | The content of molybdenum, manganese, chromium and silicon (weight %) | The sputter performance of electrode | |
| Example 1 | 0.25 | 2 | - | 0.5 | A |
| Comparative example 2 | 0.25 | 10 | - | 0.5 | D |
| Comparative example 3 | 0.25 | 6 | - | 0.5 | D |
| Comparative example 4 | 0.25 | 5 | - | 0.5 | D |
| Example 5 | 0.25 | 4.9 | - | 0.5 | C |
| Example 6 | 0.25 | 4 | - | 0.5 | B |
| Example 7 | 0.25 | 3 | - | 0.5 | B |
| Example 8 | 0.25 | 1 | - | 0.5 | A |
| Example 9 | 0.25 | 0.5 | - | 0.5 | A |
| Example 10 | 0.25 | 0.2 | - | 0.5 | A |
| Example 11 | 0.55 | 2 | 110 | 1.2 | C |
| Example 12 | 0.55 | 2 | 100 | 1.2 | C |
| Example 13 | 0.55 | 2 | 95 | 1.2 | B |
| Example 14 | 0.55 | 2 | 70 | 1.2 | A |
| Example 15 | 0.55 | 2 | 60 | 1.2 | A |
| Example 16 | 0.55 | 2 | 45 | 1.2 | A |
| Example 17 | 0.55 | 2 | 70 | 0.2 | C |
| Example 18 | 0.55 | 2 | 70 | 0.3 | B |
| Example 19 | 0.55 | 2 | 70 | 1.5 | A |
| Example 20 | 0.55 | 2 | 70 | 2.5 | A |
| Example 21 | 0.55 | 2 | 70 | 3.5 | B |
| Example 22 | 0.55 | 2 | 70 | 3.6 | C |
| Example 23 | 0.07 | 4 | - | 0.5 | C |
| Example 24 | 0.08 | 4 | - | 0.5 | B |
| Example 25 | 0.15 | 4 | - | 0.5 | B |
| Example 26 | 0.5 | 4 | - | 0.5 | A |
| Example 27 | 1.3 | 4 | - | 0.5 | B |
| Example 28 | 1.4 | 4 | - | 0.5 | C |
| Comparative example | 0.25 | 20 | - | 1 | D |
It is obvious that, even if each cold-cathode fluorescence lamp of the present invention comprise when tube current causes high pressure, have equally good sputter repellence electrode, and the durability of said cold-cathode fluorescence lamp is good.
Even if cold-cathode fluorescence lamp of the present invention apply also have good sputter repellence under the situation of big tube current, form mercury alloy hardly, burden that environment is caused is little, can easily make and so that long-life realistic scale work to be provided with low cost.Cold-cathode fluorescence lamp is suitable for being used as and to be used for television set, computer and other liquid crystal indicator employed backlight, the reading image light source in facsimile machine and other similar device, the eraser light source in the photocopier, and various demonstration purpose.
Claims (6)
1. method that is used to make cold-cathode fluorescence lamp, said cold-cathode fluorescence lamp comprises: transparent tube, said transparent tube comprise and are arranged on the fluorescence coating on the internal face and comprise inert gas and mercury that the two ends of said transparent tube are airtight by seal member; Electrode, said electrode be arranged on said transparent tube two ends near; And lead-in wire; Said lead-in wire is connected to said electrode and passes said seal member; Wherein each said electrode is processed by iron or ferroalloy materials; It is the micro-structural that 4.9 μ m or littler iron or ferroalloy crystal grain constitute that said iron or ferroalloy materials have by average diameter, and wherein said method comprises:
The foundry goods that formation is processed by iron or ferroalloy materials; And
Forge or rolling said foundry goods through on a plurality of directions, being out of shape, with the electrode that formation has micro-structural, said micro-structural is that 4.9 μ m or littler iron or ferroalloy crystal grain constitute by average diameter.
2. the method for manufacturing cold-cathode fluorescence lamp according to claim 1, wherein said iron or ferroalloy materials are included in the above carbon in the scope below the 1.4 quality % of 0.08 quality %.
3. the method for manufacturing cold-cathode fluorescence lamp according to claim 1,
Wherein said iron or ferroalloy materials comprise the carbon of carbide particle form in said iron or ferroalloy crystal grain.
4. the method for manufacturing cold-cathode fluorescence lamp according to claim 3,
The average diameter of wherein said carbide particle is 95nm or less than 95nm.
5. the method for manufacturing cold-cathode fluorescence lamp according to claim 3,
Wherein said carbide particle is made up of cementite.
6. the method for manufacturing cold-cathode fluorescence lamp according to claim 1,
Wherein said iron or ferroalloy materials are included in one or more in above molybdenum, manganese, chromium and the silicon in the scope below the 3.5 quality % of 0.3 quality %.
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| JP2008-204565 | 2008-08-07 | ||
| JP2008204565 | 2008-08-07 | ||
| JP2008204565A JP2010040437A (en) | 2008-08-07 | 2008-08-07 | Cold-cathode fluorescent lamp and manufacturing method therefor |
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| CN101645389A CN101645389A (en) | 2010-02-10 |
| CN101645389B true CN101645389B (en) | 2012-11-28 |
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| KR (1) | KR20100019359A (en) |
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| JP4902706B2 (en) * | 2008-09-16 | 2012-03-21 | スタンレー電気株式会社 | Cold cathode fluorescent tube electrode and cold cathode fluorescent tube using the same |
| JP2011181275A (en) * | 2010-02-26 | 2011-09-15 | Stanley Electric Co Ltd | Electrode for cold cathode ultraviolet tube, and cold cathode ultraviolet tube using the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004235073A (en) * | 2003-01-31 | 2004-08-19 | Neomax Co Ltd | Electrode alloy for fluorescent discharge tube, electrode for the fluorescent discharge tube and fluorescent discharge tube provided with the electrode |
| CN1645556A (en) * | 2001-03-28 | 2005-07-27 | 松下电器产业株式会社 | Cold cathode discharge lamp |
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| JP4367954B2 (en) * | 2005-05-25 | 2009-11-18 | 住友電気工業株式会社 | Electrode material |
| JP2008060057A (en) * | 2006-08-04 | 2008-03-13 | Sumitomo Electric Ind Ltd | Electrode for cold-cathode fluorescent lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1645556A (en) * | 2001-03-28 | 2005-07-27 | 松下电器产业株式会社 | Cold cathode discharge lamp |
| JP2004235073A (en) * | 2003-01-31 | 2004-08-19 | Neomax Co Ltd | Electrode alloy for fluorescent discharge tube, electrode for the fluorescent discharge tube and fluorescent discharge tube provided with the electrode |
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| Publication number | Publication date |
|---|---|
| KR20100019359A (en) | 2010-02-18 |
| JP2010040437A (en) | 2010-02-18 |
| TW201011807A (en) | 2010-03-16 |
| CN101645389A (en) | 2010-02-10 |
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