CN201576648U - Electrode member for cold cathode fluorescent lamp - Google Patents
Electrode member for cold cathode fluorescent lamp Download PDFInfo
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- CN201576648U CN201576648U CN200920174906XU CN200920174906U CN201576648U CN 201576648 U CN201576648 U CN 201576648U CN 200920174906X U CN200920174906X U CN 200920174906XU CN 200920174906 U CN200920174906 U CN 200920174906U CN 201576648 U CN201576648 U CN 201576648U
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- oxide layer
- glass
- leading part
- heating
- electrod assembly
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Abstract
The utility model provides an electrode member for a cold cathode fluorescent lamp with excellent sealing property between a lead wire part and glass. The electrode member (10) comprises an electrode part (11), the lead wire part (12) and a glass part (13), wherein at least the surface side of the lead wire part (12) is made of ferruginous metal, and an oxidation layer (12s) is arranged in the position which is covered by the glass part (13) in the surface of the lead wire part (12). The oxidation layer (12s) contains FeO. Compared with the oxidation layer consisting of Fe2O3 and Fe3O4, the oxidation layer (12) containing the FeO is easy to improve the sealing property with the glass. Therefore, the electrode member (10) can realize full sealing between the lead wire part (12) and the glass part (13), and further realize the mutually full sealing of the structural parts between glass tubes from the lead wire part (12) to the cold cathode fluorescent lamp.
Description
Technical field
The utility model relates to a kind of electrod assembly that is used as the structure member of cold-cathode fluorescence lamp, and the manufacture method of this electrod assembly.Be particularly related to the electrod assembly of the adaptation excellence between a kind of leading part and the glass.
Background technology
Cold-cathode fluorescence lamp is used as the original copy irradiation of photocopier or image reading apparatus etc. and uses the backlight with various light sources such as light sources of liquid crystal indicators (LCD) such as light source, computer LCD monitor or LCD TV.As typical example, have glass tube cylindraceous and pair of electrodes, in glass tube, enclose rare gas and mercury, the internal face of this glass tube has luminescent coating, and above-mentioned pair of electrodes is configured in the two ends (for example, with reference to patent documentation 1) of glass tube.
Electrode is a typical example with cup-shaped (bottom tube-like is arranged), and bonding wire is gone up in its bottom, is applied in voltage via lead-in wire.Lead-in wire for example has the inner lead that is fixed in the glass tube and engages and be configured in glass tube outside lead outward with inner lead.As the representative constituent material of inner lead, can enumerate the Kovar alloy close (Fe, Co, Ni alloy) with the thermal coefficient of expansion of glass.In requiring to have long-life and high-quality fluorescent lamp, the periphery fixing glass pearl at inner lead makes bead and glass tube fusion, so that the easy driving fit of inner lead and glass tube.Above-mentioned electrode, lead-in wire, bead are engaged in advance integratedly, should be fixed on the glass tube by integrated thing again.
Current, in order to improve the adaptation between inner lead and the bead, with bead with before inner lead engages, form oxide layer (with reference to patent documentation 1) in the periphery of inner lead.
Patent documentation 1: Japanese kokai publication hei 11-238489 communique
The utility model content
But for existing cold-cathode fluorescence lamp, even form oxide layer on lead-in wire, lead-in wire is also insufficient with the driving fit of glass.
In patent documentation 1, put down in writing following technology, by on lead-in wire, forming oxide layer, and improved the wettability between lead-in wire and the bead, improved the air-tightness of glass tube.But the driving fit between the not talkative and bead of existing oxide-film is fully, wishes further to improve bond strength.If lead-in wire does not have abundant driving fit with bead, then, in the hermetic unit of glass tube, form the space from can't driving fit between the structure member that goes between between glass tube.Gas in the glass tube might be revealed from this space.If gas is revealed, then for example can't fully radiate luminous required ultraviolet ray, the lost of life of fluorescent lamp.
Therefore, main purpose of the present utility model is, a kind of electrod assembly that can improve the bond strength between leading part and the glass is provided.In addition, another purpose of the present utility model is, a kind of manufacture method that is suitable for this electrod assembly is provided.
Oxide layer can contain in the atmosphere of aerobic at air etc., forms by lead-in wire is heated.For example, if in air the lead-in wire that is made of Kovar alloy is heated and form oxide layer, then this oxide layer is by the higher iron oxide of oxygen content, di-iron trioxide (Fe specifically
2O
3) and tri-iron tetroxide (Fe
3O
4) constitute.The oxide layer that constitutes by above-mentioned iron oxide sometimes can't with bead or the abundant driving fit of glass tube.In order to improve adaptation, for example consider oxide layer is thickened.But if oxide layer is thicker, then oxide layer itself becomes fragile and peels off easily.In addition, because the difference of the thermal coefficient of expansion of the thermal coefficient of expansion of oxide layer and glass is bigger, so, then between glass and lead-in wire, have the bigger oxide layer of thermal coefficient of expansion if oxide layer is thicker.In addition, the oxide layer that is formed on the leading part has a large amount of spaces.Though these spaces can be reduced by the heating when bead is engaged with leading part or in the heating by by the electrod assembly sealed glass tube time, if oxide layer is thicker, then can be in film residual a large amount of spaces.May make gas leakage in the glass tube by these residual spaces.
Therefore, the inventor studies the structure that need not to make the oxide layer thickening just can improve bond strength, its result, and discovery preferably contains the oxide layer of specific compound.Specifically, contain the oxide layer of FeO with by Fe
2O
3And Fe
3O
4The oxide layer that constitutes is compared, and its bond strength improves.Though its reason is not clear and definite as yet, can think that this is to improve because contain oxide layer and the wettability between the glass of FeO.Therefore, electrod assembly of the present utility model forms the structure with the oxide layer that contains FeO.Specifically, electrode component used for cold cathode fluorescent lamp of the present utility model has electrode part and leading part.Leading part is connected with the end of electrode part.In addition, the face side at least of leading part is made of the metal of iron content.On at least a portion on above-mentioned leading part surface, has the oxide layer that contains FeO.
Electrod assembly of the present utility model can be with leading part and the abundant driving fit of glass owing to have above-mentioned oxide layer, therefore, during with the peristome sealing of glass tube, can make leading part electrod assembly of the present utility model being configured on the glass tube to the fully driving fit mutually of the structure member between the glass tube.Therefore, using electrod assembly of the present utility model to form under the situation of cold-cathode fluorescence lamp, this fluorescent lamp can suppress gas to be revealed from the hermetic unit of glass tube, by there is enough gas (particularly mercury) in glass tube, can make its ILS.In addition, because there is enough gas (particularly mercury) in this lamp,, can suppress to reduce this situation of the lost of life that makes because of brightness so can keep high brightness.
Electrod assembly of the present utility model can be made according to following manufacture method of the present utility model.The end that the manufacture method of electrode component used for cold cathode fluorescent lamp of the present utility model is used to be manufactured on electrode part has the electrod assembly of leading part, and it has following oxide layer and forms operation.
[oxide layer formation operation] heats the periphery of leading part and forms oxide layer on the surface of leading part.At least the face side of leading part is made of the metal of iron content.In addition, this operation has two different operations of atmosphere shown below.
<oxidizability operation〉in oxidizing atmosphere, leading part is heated and form oxide layer.
<non-oxidizable operation〉after the oxidizability operation, in non-oxidizing atmosphere, leading part is heated, and in oxide layer, generate FeO.
Above-mentioned manufacture method of the present utility model by in different atmosphere leading part being heated, and can be made the electrod assembly of the present utility model with the oxide layer that contains FeO simply.Below, illustrate in greater detail the utility model.
Electrod assembly of the present utility model is as the constituent material of cold-cathode fluorescence lamp, and it has the electrode part that is used to discharge and to the leading part of electrode part supply capability.Especially, the electrod assembly that in requiring long-life and high-quality cold-cathode fluorescence lamp, uses, preferably on the basis of above-mentioned electrode part, leading part, also has glass portion, it works as bonding agent on the glass tube that electrode part is fixed on fluorescent lamp the time, becomes the seal member of glass tube simultaneously.
Leading part for example can use the structure with inner lead portion and outside lead portion.Inner lead portion is the one end engaged and be fixed on the inside of glass tube with electrode part a part, and outside lead portion is the part that engages and be exposed to the outside of glass tube with inner lead portion.Inner lead portion and outside lead portion by the welding etc. engage.Be provided with in the bonding part under the situation of solder-bump,, can prevent the offset of glass portion by with the retainer of solder-bump as the aftermentioned bead.
The wire rod that outside lead portion for example can use the wire rod that is made of nickel (Ni), be made of this nickel alloy of MnNi, the wire rod that constitutes by Dumet copper-clad iron-nickel alloy etc.These wire rods can also have coating such as nickel coating.
Inner lead portion is because in periphery and glass tube or the such glass bond of glass portion that is made of bead, so can suitably use the wire rod that is made of the approaching material of thermal coefficient of expansion and glass.In addition, inner lead portion can suitably use the wire rod that is made of high conductive material.As the material that satisfies above-mentioned characteristic, can enumerate the metal that contains iron (Fe).Especially, for electrod assembly of the present utility model, the wire rod that inner lead portion uses face side at least to be made of the metal of iron content.For example, can use the wire rod that constitutes by the alloy behind mixed C o, the Ni in Fe (containing Si, Mn etc. in addition) that is called Kovar alloy, perhaps have the core that constitutes by copper (Cu) and be arranged on the wire rod etc. of the Kovar alloy layer of this core periphery.On at least a portion on inner lead portion surface, be pre-formed oxide layer.More particularly, on the surface of inner lead portion, formed oxide layer by the position of glass tube or glass portion covering.Therefore, have at electrod assembly of the present utility model under the situation of the glass portion that engages with the leading part periphery, there is oxide layer in the boundary vicinity that this electrod assembly constitutes between glass portion and inner lead portion.
Oxide layer is made of the oxide that the constituting the element oxidation of leading part formed.Under the situation that the face side at least of inner lead portion is made of the metal of iron content, in fact oxide layer is made of iron oxide.Especially, forming under the situation of oxide layer under this oxidizing atmosphere of air, this oxide layer is by di-iron trioxide (Fe
2O
3) and tri-iron tetroxide (Fe
3O
4) constitute.Electrod assembly of the present utility model has at Fe
2O
3And Fe
3O
4Outside also contain the oxide layer of iron monoxide (FeO), in the XRD of oxide layer (X-ray diffraction) measured, FeO was with respect to Fe
2O
3Minimum XRD peak signal strength than and FeO with respect to Fe
3O
4The aggregate value of minimum XRD peak signal strength ratio more than or equal to 0.01.Contain the oxide layer of FeO with by Fe
2O
3And Fe
3O
4The oxide layer that constitutes is compared, and has the trend good with the adaptation of glass, and the content of FeO is many more, just easy more raising of adaptation.Especially, no matter have or not glass portion, the oxide layer integral body that has on electrod assembly is as 100% o'clock, preferred FeO content be volume ratio more than or equal to 1%, be preferably greater than especially or equal 10%.
The oxide layer that forms on leading part by heating when glass portion is engaged with leading part or the heating when being fixed on electrod assembly on the glass tube, and changes the ratio of the compound of formation.Specifically, the content of FeO has the trend that reduces because of above-mentioned heating.Therefore, under the situation of electrod assembly, at forming glass portion leading part before, so that in the XRD determining of oxide layer, FeO is with respect to Fe with glass portion
2O
3Minimum XRD peak signal strength than and FeO with respect to Fe
3O
4The aggregate value of minimum XRD peak signal strength ratio surpass 0.01 mode, on leading part, form oxide layer, so that in the electrod assembly after forming glass portion, the FeO content in the oxide layer is that volume ratio is more than or equal to 1%.Specifically, according to the mensuration of XRD, be volume ratio more than or equal to 10%, be preferably greater than or equal 50% mode and form oxide layer with the FeO content in the oxide layer that has on the leading part.
Whether the oxidated layer thickness of electrod assembly exists irrelevantly with glass portion, be preferably greater than or equal 1 μ m and less than 10 μ m, more preferably greater than or equal 1 μ m and be less than or equal to 7 μ m.If the oxidated layer thickness of electrod assembly less than 1 μ m, then by the heating when being fixed on electrod assembly on the glass tube, makes the thickness of oxide layer attenuation easily, oxide layer might disappear.Disappear by oxide layer, then the formation element of leading part is easily to glass side diffusion, the easy thickening of ion diffusion layer described later.If surpass 10 μ m, even then be used for fixing heating to the glass tube, also may residual a large amount of spaces in oxide layer.Thickness of oxide layer can be corresponding to the size (internal diameter) of the size (diameter) of leading part or glass tube and is adjusted.Under the diameter of leading part was situation about 0.4~1.2mm, the oxidated layer thickness of electrod assembly was preferably above-mentioned scope.The diameter of leading part than the bigger situation of above-mentioned scope under, can make thickness of oxide layer greater than above-mentioned scope.
But, under the situation of electrod assembly, the element that constitutes oxide layer is spread to glass side, thereby is formed at the thickness of oxide layer attenuation on the leading part by the heating when glass portion engages with glass portion.Therefore, be above-mentioned scope (1~10 μ m) in order to make the thickness of oxide layer that forms glass portion electrod assembly afterwards, and make the oxide layer that on the leading part before the formation glass portion, forms, than the more heavy back formation of this scope.Specifically, about preferred 6~20 μ m.Thickness of oxide layer before glass portion forms can suitably be adjusted, as long as the oxidated layer thickness after glass portion is formed satisfies above-mentioned scope.
The oxide layer that contains FeO can form by the heating in two stages.Phase I add thermal recovery oxidizing atmosphere (oxidizability operation), oxygen element (O) is combined with the formation element (Fe) of leading part, form Fe
2O
3Or Fe
3O
4Add at this and to pine for using burner or electric furnace.Burner burns easily with the adjustment of gas, uses gas by suitable adjustment burning, can stably form the oxide layer of expectation thickness.Electric furnace is owing to can disposablely forming oxide layer, so if use electric furnace, then production excellence on a large amount of leading parts.When having the electrod assembly of glass portion, condition under the situation of using burner can be enumerated heating-up temperature: 900~1200 ℃, heating time: 3~12 seconds, condition under the situation of using electric furnace can be enumerated heating-up temperature: 650~1000 ℃, and heating time: 2~8 minutes.Exist heating-up temperature high more or heating time is long more, oxide layer is thick more trend just.Preferred condition is, is heating-up temperature under the situation of burner using: 950~1150 ℃, heating time: 3~8 seconds, be heating-up temperature under the situation of electric furnace using: 700~850 ℃, and heating time: 3~5 minutes.Under the situation of the electrod assembly that does not have glass portion, shorten above-mentioned heating time and get final product.As long as oxidizing atmosphere contains aerobic, for example can enumerate air atmosphere.This oxidizability operation is because be to heat in oxidizing atmosphere, so oxygen element (O) combines generation Fe with iron (Fe) in the inner lead portion constituent material
2O
3Or Fe
3O
4The iron oxide that these oxygen element binding capacities are more, and do not generate FeO.
(non-oxidizable operation) carried out in the heating of second stage in non-oxidizing atmosphere.Do not heat if substantially do not exist in the atmosphere of oxygen, then thickness of oxide layer can't substantially increase, but the Fe that constitutes element as leading part is diffused in the oxide layer that forms by phase I heating (oxidizability operation).By this diffusion, can improve the atomic ratio of the Fe in the oxide layer, thereby in oxide layer, generate FeO.This heating is owing to carrying out in non-oxidizing atmosphere, so preferably use electric furnace.In addition, make the compound that constitutes oxide layer change required degree as long as this heating proceeds to, concrete condition can be enumerated heating-up temperature: 900~1100 ℃, heating time: 3~5 minutes.Preferred condition is a heating-up temperature: 950~1050 ℃, heating time: 3.5~4.5 minutes.Non-oxidizing atmosphere so long as in fact oxygen-free get final product, can enumerate by nitrogen (N
2) or the inert atmosphere that constitutes of argon gas (Ar), helium inert gases such as (He).Also can use the reducing atmosphere that in above-mentioned inert gas, contains reducibility gas such as hydrogen.In addition, as mentioned above, because this heating can not make thickness of oxide layer change substantially, so add the roughly oxide layer of desirable thickness of thermosetting by the phase I in advance.
The formation material of electrode part can use for example nickel (pure Ni), tungsten (W), molybdenum (Mo) etc.The processability of pure Ni and economical.W and Mo compare with pure Ni, and fusing point is very high, can reduce the consumption or the lowering of luminance of electrode part.In addition, form material and can use the Ni alloy that in pure Ni, adds doped chemical and form.Specifically, can enumerate following Ni alloy, promptly, with add up to be less than or equal to more than or equal to 0.001 quality % 5.0 quality % contain from Ti, Hf, Zr, V, Fe, Nb, Mo, Mn, W, Sr, Ba, B, Th, Be, Si, Al, Y and rare earth element (except Y) selection more than or equal to a kind of element, remainder is made of Ni and unavoidable impurities.Especially, also can form following Ni alloy, promptly, with add up to be less than or equal to more than or equal to 0.001 quality % 3.0 quality % contain from Be, Si, Al, Y and rare earth element (except Y) selection more than or equal to a kind of element, remainder is made of Ni and unavoidable impurities.By the electrode part that above-mentioned Ni alloy constitutes, have following various advantage: 1. because work function less than the electrode that constitutes by pure Ni, so easily discharge; 2. be difficult for sputter (sputter speed or rate of etch are little); 3. be difficult for forming amalgam; 4. because be difficult to form oxide layer, so be difficult for hindering discharge.Especially, the Ni alloy that contains Y can make resistance to sputtering improve.
The representative shape of electrode part can be enumerated cup-shaped (bottom tube-like is arranged).The electrode part of cup-shaped can easily form by board-like material is carried out punch process.The electrode part of cup-shaped can suppress sputter by hollow cathode effect.
Under the situation of the electrod assembly with glass portion, glass portion forms by following manner, that is, the bead of tubular inserted on the periphery that is configured in the leading part (inner lead portion) that is formed with above-mentioned oxide layer heat, be out of shape.In addition, by this heating, glass portion is engaged with the periphery of inner lead portion.Bead can use the parts that for example are made of Pyrex or sillico aluminate glass.
By being used to form the heating of glass portion, leading part also is heated, thereby the element that constitutes leading part and oxide layer is spread to glass side, and in glass portion, the side that particularly contact with oxide layer in glass portion, generation is mixed with the ion diffusion layer of glass portion composition and leading part composition.Ion diffusion layer is because its thermal coefficient of expansion is different with the other parts of glass portion, so if blocked up just becoming makes glass portion or near glass tube (hermetic unit) crack reason.In addition, also can generate ion diffusion layer or it is thickened by the heating that is used for sealed glass tube.Therefore, the ion diffusion layer of preferred electrode parts is thin as far as possible, and preferably its thickness is less than or equal to 15 μ m, especially preferably is less than or equal to 12 μ m.
The formation of glass portion can use burner or electric furnace to carry out.For example, can use following method, that is, in reducing atmosphere, bead be heated, make its distortion and engage, simultaneously, the oxide layer of the position (exposing the position) that do not covered by glass portion in the leading part be reduced.Here, in order to improve the bond strength between leading part and the glass portion,, and can make the abundant fusion of glass portion effectively and improve its wettability with respect to oxide layer by to make heating-up temperature be high temperature or prolong heating time.But if heating-up temperature is higher or heating time is longer, then bead can be out of shape in the mode of extending along the oxide layer of leading part, is difficult to form desired shape.On the other hand, if reduce heating-up temperature or shorten heating time,, can't fully engage though then make bead be deformed into desired shape easily.Therefore, by carrying out the heating in two stages as described later, and be not to pine for being out of shape and engaging once adding, can make bead be deformed into desired shape, bead is fully engaged with leading part, and can prevent the thick filmization of ion diffusion layer, thus preferred.
Specifically, preferably carry out the following glass portion formation operation that has the distortion operation and engage operation.
[glass portion formation operation] by disposing bead on the periphery of the leading part that is formed with oxide layer, bead is heated make its distortion, thereby form glass portion, simultaneously, glass portion engaged with leading part.
[distortion operation] in non-oxidizing atmosphere, heating-up temperature: 700~800 ℃, heating time: 3~5 minutes
[joint operation] in reducing atmosphere, heating-up temperature: 900~1100 ℃, 3~5 minutes heating times
The distortion operation is to be mainly used in the heating process of carrying out the bead distortion.Non-oxidizing atmosphere for example can be enumerated the inert atmosphere that is made of inert gases such as nitrogen or argon gas, helium.Because the employing non-oxidizing atmosphere, so the preferred electric furnace that uses of this heating carries out.In addition, electric furnace can once make a plurality of bead distortion, so if use electric furnace, then production is good.Preferred condition is a heating-up temperature: 750~800 ℃, heating time: 3.5~4 minutes.The distortion operation is because be relatively low temperature, so can not form ion diffusion layer substantially.
Engage operation and be and be mainly used in the heating process that the bead that makes after the distortion and leading part engage.Reducing atmosphere can be enumerated the atmosphere that for example contains this reducibility gas of hydrogen in inert gases such as nitrogen or argon gas, helium.If electric furnace is used in heating, then can carry out continuously with above-mentioned distortion operation.Preferred condition is a heating-up temperature: 950~1000 ℃, heating time: 3.5~4 minutes.In addition, engage operation because be reducing atmosphere, so can use burner to heat.In the case, be preferably heating-up temperature: 1000~1200 ℃, heating time: 5~10 seconds.Engage in the operation at this,,, can make the thickness of ion diffusion layer be less than or equal to 15 μ m by heating under these conditions though form ion diffusion layer.In addition, by this heating, can reduce the space that exists in the oxide layer.In addition, by this heating, can will do not removed in the leading part by glass-faced locational oxide layer reduction.
Have above-mentioned leading part and electrode part and have the electrod assembly of the present utility model of glass portion as required, be suitable as the structure member of cold-cathode fluorescence lamp.For example, have the glass tube of two peristomes and electrod assembly of the present utility model when forming cold-cathode fluorescence lamp, can enumerate following steps in use.Prepare the glass tube that internal face is provided with luminescent coating, in the peristome of glass tube one side, insert electrod assembly, leading part (glass portion) is configured near this peristome.And, on the glass tube with the leading part position contacting (have at electrod assembly under the situation of glass portion, on the glass tube with glass portion position contacting and glass portion) heat, make glass melting, with peristome sealing, fixed electrode component simultaneously.Then, after the opposite side peristome from glass tube vacuumizes, in glass tube, import the gas of regulation, in the opposite side peristome, insert another electrod assembly, leading part (glass portion) is configured near this peristome.And, to on the glass tube with the leading part position contacting (have at electrod assembly under the situation of glass portion, on the glass tube with glass portion position contacting and glass portion) heat, make glass melting, with the glass tube sealing, simultaneously electrod assembly is fixed on the glass tube.Can obtain cold-cathode fluorescence lamp by above operation.Glass tube has two peristomes with I word shape structure is representative, and in addition, glass tube also has L word shape (peristome is two or three) or T word shape (peristome is three) etc.
The effect of utility model
Electrode component used for cold cathode fluorescent lamp of the present utility model can make leading part and the abundant driving fit of glass portion.Therefore, using electrod assembly of the present utility model to form under the situation of cold-cathode fluorescence lamp, can make, can prevent that the hermetic unit from glass tube from producing gas leakage from the structure member fully driving fit mutually that goes between between glass tube.Therefore, electrod assembly of the present utility model can help the long lifetime of fluorescent lamp.
Description of drawings
Fig. 1 is the part sectioned view of the schematic configuration of expression electrod assembly.
Fig. 2 is the key diagram of explanation bond strength test.
Embodiment
The compound that constitutes oxide layer is changed and the manufacturing electrod assembly, detect bond strength.
[electrod assembly]
Fig. 1 is the part sectioned view of the schematic configuration of expression electrod assembly.The electrod assembly of making is the structure identical with electrod assembly shown in Figure 1 10.The glass portion 13 that electrod assembly 10 has the electrode part 11 of cup-shaped, the leading part 12 that engages with electrode part 11 bottoms, engages with the periphery of leading part 12.Leading part 12 is made of 12i of inner lead portion and the 12o of outside lead portion, and wherein, the 12i of inner lead portion engages with the glass tube of cold-cathode fluorescence lamp, and the 12o of outside lead portion is configured to be exposed to the outside of pipe.The position that the 12i of inner lead portion is covered by glass portion 13 in its surface has oxide layer 12s.The kind electrode parts are as described below to be made.
<embodiment 〉
1. the formation of electrode part and leading part
Electrode part 11 forms cup-shaped by the nickel plate is carried out punch process.Leading part 12 is that an end face of the wire rod that constitutes by an end face of the wire rod (diameter Ф 0.8mm) that will be made of Kovar alloy (Ni:28~30 quality %, Co:16~18 quality %, all the other are Fe) with by nickel alloy (MnNi) welds and forms.The Kovar alloy wire segment is the 12i of inner lead portion, and the nickel alloy wire rod partly is the 12o of outside lead portion.On the bonding part of two wire rods, form solder-bump (not shown).Resulting leading part 12 is carried out surface treatments such as barreling, chemical polishing.Prepare a plurality of above-mentioned leading parts.
2. the formation of oxide layer
Periphery (than the periphery of more inner leading part side of solder-bump) to inner leading part 12i heats, and forms oxide layer 12s on the surface of the 12i of inner lead portion.Heat and as described belowly carry out with two stages.
(1) oxidizability operation
Use electric furnace in air atmosphere with heating-up temperature: 800 ℃, heating time: heated in 4 minutes.
(2) non-oxidizable operation
Then use electric furnace in nitrogen atmosphere with heating-up temperature: 980 ℃, heating time: heated in 4 minutes, then the cooling.
After cooling, the ratio (volume ratio) that formation is formed at the compound of the oxide layer on the leading part detects.Measurement is undertaken by XRD.Its result detects FeO in all leading parts, be FeO according to volume ratio 90%, and all the other are Fe
3O
4And Fe
2O
3
In addition, the thickness of oxide layer that is formed on the leading part is detected, its thickness is 2.8~3.7 μ m.Thickness of oxide layer is to use microphotograph to measure.In addition, when utilizing microscope to confirm the state of oxide layer, find to have a large amount of spaces.
Then, bead is through on the periphery of the 12i of inner lead portion that is formed with above-mentioned oxide layer.Bead is by with SiO
2For main component and contain Na
2The cylinder-like body of the hollow that the Pyrex of O etc. (BFK) constitute has through hole at end face.Through hole is more bigger than the external diameter of the 12i of inner lead portion.Therefore, in the time of on bead being through the 12i of inner lead portion, between the outer peripheral face of the inner peripheral surface of bead and the 12i of inner lead portion, produce the gap.In the time of on being through the 12i of inner lead portion, bead easily is positioned by solder-bump on the assigned position of length direction of the 12i of inner lead portion.
3. the joint of electrode part
With the other end of the 12i of inner lead portion (surface of not having the welding convex side), engage with the bottom surface of the electrode part 11 of cup-shaped by laser welding.By before the bead fusion (glass portion form before) electrode part 11 is engaged with leading part 12, can suppress following situation, promptly, cause the formation element of oxide layer to spread to glass side owing to the heating when the bonding electrodes portion is heated the 12i of inner lead portion.The joint of electrode part also can carry out after bead fusion described later.
4. the formation of glass portion
(1) distortion operation
To be configured in the electric furnace with the leading part 12 that electrode part 11 engaged and disposed bead, in nitrogen atmosphere with heating-up temperature: 800 ℃, heating time: heated in 4 minutes, and made the bead distortion and stick on the oxide layer.Specifically, bead becomes mode round and that shrink by heating with the bight and is out of shape, and the inner peripheral surface of through hole sticks on the oxide layer.By this distortion, make bead form glass portion 13.
(2) engage operation
In electric furnace, sneak into hydrogen, form (nitrogen+hydrogen) atmosphere (the hydrogen ratio: 16 volume %), in this reducing atmosphere with heating-up temperature: 980 ℃, heating time: heated in 4 minutes, and made glass portion 13 and oxide layer 12s driving fit.That is, the part of oxide layer 12s is diffused in the glass portion 13.In addition, by this heating, on the 12i of inner lead portion, with the oxide layer reduction of the part that do not covered and expose and remove by glass portion 13.
By above-mentioned 1~4 operation, obtain having electrode part, the electrod assembly of leading part, glass portion.Make a plurality of kind electrode parts, with these electrod assemblies as embodiment.For embodiment, detect the ratio of the compound that constitutes oxide layer by XRD.For electrod assembly arbitrarily, all observe a large amount of and FeO, Fe
2O
3And Fe
3O
4Corresponding XRD peak signal, the FeO that observes is with respect to Fe
2O
3Minimum XRD peak signal strength than and FeO with respect to Fe
3O
4The aggregate value of minimum XRD peak signal strength ratio more than or equal to 0.01.In addition, oxide layer contains volume ratio more than or equal to 1% FeO, and all the other are Fe
3O
4And Fe
2O
3
In addition, for embodiment, using microphotograph to measure thickness of oxide layer, is 1.4~2.5 μ m, be formed on leading part on the time thickness of oxide layer compare attenuation.Utilize microscope to confirm the state of the oxide layer of embodiment, find the space minimizing.
In addition, for embodiment, using microphotograph to measure the thickness of ion diffusion layer, is 6.2~7.2 μ m, is less than or equal to 15 μ m, extremely thin.
<Comparative Examples 〉
Be manufactured on the electrod assembly that forms oxide layer under the condition different with the foregoing description.In this electrod assembly, oxide layer is not carried out the heating in two stages, but the thermosetting that adds by a stage.Concrete condition is, uses electric furnace, and in air atmosphere, heating-up temperature is 800 ℃, and be 4 minutes heating time.Operation except forming oxide layer is same as the previously described embodiments, makes a plurality of electrod assemblies thus, and with these electrod assemblies as a comparison case.
After forming glass portion, for Comparative Examples, detect the ratio of the compound that constitutes oxide layer by XRD, the result does not all detect FeO in all electrod assemblies, only detect Fe
3O
4And Fe
2O
3In addition, the thickness of oxide layer of Comparative Examples is 3~5 μ m, and the thickness of ion diffusion layer is 6~7 μ m, is less than or equal to 15 μ m.
<reference example 〉
Use W (tungsten) to make inner lead portion, produce the electrod assembly that is provided with glass portion.Glass portion that uses in the reference example and glass tube are thermal coefficient of expansion and the approaching parts of W.Make a plurality of kind electrode parts, as a reference example with these electrod assemblies.
[bond strength test]
For embodiment, Comparative Examples, reference example, as detecting the bond strength between glass portion and the leading part shown in following.Bond strength is meant, as shown in Figure 2, and fixed electrode component on the anchor clamps 200 that are provided with through hole, when outside leading part imposed load is stretched, detect the power (N) when glass portion destroys, wherein, this through hole is of a size of leading part and can inserts, but glass portion can't insert.Embodiment so be manufactured on the substitutions of elements 100 that is formed with glass portion 130 in the inner lead portion 120 with identical condition, uses this substitutions of elements 100 to detect bond strength because outside lead portion just ruptures before glass portion destroys.Its result is shown in the table 1.
Table 1
Embodiment | Comparative Examples | Reference example | |
n=1 | 230.5 | 112.0 | 186.0 |
n=2 | 233.5 | 113.4 | 147.0 |
n=3 | 233.8 | 121.5 | 203.0 |
n=4 | 232.6 | 115.6 | 220.0 |
n=5 | 238.6 | 126.3 | 185.0 |
ave | 233.8 | 117.8 | 188.2 |
max | 238.6 | 126.3 | 220.0 |
Embodiment | Comparative Examples | Reference example | |
min | 230.5 | 112.0 | 147.0 |
r (max-min) | 8.1 | 14.3 | 73.0 |
σ | 3.0 | 6.0 | 27.1 |
According to table 1, the glass portion of embodiment and the bond strength between the leading part are good as can be known.Therefore, using the kind electrode parts to form under the situation of cold-cathode fluorescence lamp, expectation can make from leading part to the abundant driving fit of the structure member between the glass tube, can prevent that gas from revealing from the hermetic unit of glass tube.
[bend test]
For embodiment, Comparative Examples, inner leading part is applied bending, the collapsed state of research glass portion.Its result in Comparative Examples, is broken from the mode that leading part comes off with the fragment of glass portion.Relative therewith, in an embodiment, do not peel off and the mode that fragment comes off takes place break from leading part with glass portion, kept shape on the leading part but stick to, but upwards produced a lot of crackles in the footpath of glass portion.Thus, can think that the glass portion of embodiment is along the complete driving fit of the periphery of leading part.
[long duration test]
Use the electrod assembly of embodiment, Comparative Examples to make cold-cathode fluorescence lamp, carry out long duration test.Cold-cathode fluorescence lamp is made as follows, that is, use the glass tube of I word shape, on each peristome, dispose the electrod assembly of embodiment respectively with two peristomes, glass is heated anchor leg portion in sealed open portion (embodiment light fixture).On glass tube, form the halophosphate luminescent coating as luminescent coating at internal face in advance.In addition, when the peristome with a side seals, after vacuumizing, in glass tube, import the mist of mercury and argon gas.The Comparative Examples light fixture that uses the electrod assembly of Comparative Examples and constitute is also made in the same manner.
Carry out long duration test for the embodiment light fixture that obtains, Comparative Examples light fixture.The brightness of cold-cathode fluorescence lamp, deterioration significantly in 1000 hours (initial 1000 hours) of light a lamp (initially), degradation afterwards is less.Therefore, initial brightness value is made as 100%, has durability if the brightness after 1000 hours more than or equal to 80% of original intensity, then is evaluated as.Its result, the embodiment light fixture is 93%, its durability is no problem as can be known.On the other hand, the Comparative Examples light fixture is 65%.In addition, the Comparative Examples light fixture detects gas leakage in lighting a lamp, and is relative with it, and the embodiment light fixture is gas leakage not.Therefore, can think that the embodiment light fixture has one of reason of durability and is, from the structure member fully driving fit mutually that goes between between glass tube, the gas in the glass tube fully exists.In addition, because durability is good, so can think that the embodiment lamp life is longer.
In addition, only otherwise break away from purport of the present utility model, can suitably change the foregoing description, be not limited to said structure.
Industrial applicibility
Electrod assembly of the present utility model can suitably be used as the structure member of cold-cathode fluorescence lamp. The manufacture method of electrod assembly of the present utility model can suitably be used for the manufacturing of electrod assembly of the present utility model. The cold-cathode fluorescence lamp that uses electrod assembly of the present utility model and consist of, can be suitably as shining with the light source of the electric section of disappearing of light source, duplicator (eraser) with various electronic equipments such as light sources such as the frontlighting with light source, miniscope backlight of the liquid crystal display original copy with light source, duplicator or scanner etc.
Claims (3)
1. electrode component used for cold cathode fluorescent lamp, it has:
Electrode part, it is made of metal material;
Inner lead portion, it is connected with the end of electrode part, is made of the metal material that contains Fe; And
Outside lead portion, its end with inner lead portion is connected, constitutes by metal material,
This electrode component used for cold cathode fluorescent lamp is characterised in that to have:
Oxide layer, it is positioned at the surface of inner lead portion, and thickness is less than or equal to 10 μ m more than or equal to 1 μ m, and this oxide layer contains FeO, and simultaneously, FeO is with respect to Fe
2O
3Minimum XRD peak signal strength than and FeO with respect to Fe
3O
4The aggregate value of minimum XRD peak signal strength ratio more than or equal to 0.01.
2. an electrode for cold-cathode fluorescent lamp is characterized in that having glass portion, and this glass portion engages with the electrode component used for cold cathode fluorescent lamp of claim 1 record via the oxide layer on the surface that is arranged in inner lead portion.
3. a cold-cathode fluorescence lamp is characterized in that, has the electrode for cold-cathode fluorescent lamp of record in the claim 2.
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