CN105359252B - The manufacture method of the negative electrode of short arc discharge lamp and short arc discharge lamp - Google Patents

The manufacture method of the negative electrode of short arc discharge lamp and short arc discharge lamp Download PDF

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Publication number
CN105359252B
CN105359252B CN201480037590.3A CN201480037590A CN105359252B CN 105359252 B CN105359252 B CN 105359252B CN 201480037590 A CN201480037590 A CN 201480037590A CN 105359252 B CN105359252 B CN 105359252B
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China
Prior art keywords
negative electrode
emitter stage
leading section
stem portion
forms
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CN201480037590.3A
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CN105359252A (en
Inventor
田川幸治
船越充夫
有本智良
音岛优纪
安田幸夫
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Ushio Denki KK
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Ushio Denki KK
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Priority claimed from JP2013207124A external-priority patent/JP5825316B2/en
Priority claimed from JP2013265193A external-priority patent/JP5949747B2/en
Application filed by Ushio Denki KK filed Critical Ushio Denki KK
Publication of CN105359252A publication Critical patent/CN105359252A/en
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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
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • H01J61/0732—Main electrodes for high-pressure discharge lamps characterised by the construction of the electrode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/022—Manufacture of electrodes or electrode systems of cold cathodes
    • H01J9/025—Manufacture of electrodes or electrode systems of cold cathodes of field emission cathodes

Abstract

A kind of manufacture method that can stably obtain the desired short arc discharge lamp for lighting startability and the negative electrode of use for discharge lamp is provided.Short arc discharge lamp possesses the negative electrode for making multiple negative electrodes form part engagement and being formed, make to be located in the fastener (50) that each negative electrode formed between part by forming part to each negative electrode and being powered and melt, form part (32) so that containing emitter stage material negative electrode forms part (35) and is engaged in the negative electrode and forms other negative electrodes of part and engage.

Description

The manufacture method of the negative electrode of short arc discharge lamp and short arc discharge lamp
Technical field
The present invention relates to the manufacture method of a kind of short arc discharge lamp and the negative electrode of short arc discharge lamp.More particularly to It is a kind of possess include the short arc discharge lamp of negative electrode and the manufacture method of the negative electrode of emitter stage material in front part.
Background technology
Short arc discharge lamp (it is following, also it is referred to as " discharge lamp ".) due to close to spot light, therefore by with optical system Combination, serve as the light source of the higher exposure device of light gathering efficiency.
In addition, the short arc discharge lamp for having enclosed xenon is used as the light source of projecting apparatus etc..
In the past, in the negative electrode of this discharge lamp, the purpose of startability is lighted for raising, added with referred to as emitter stage Material, for make work function reduce material.The emitter stage material included as negative electrode, because the contribution to startability is excellent Elegant and long-term use of thorium compound is (with reference to patent document 1.).However, thorium is the stronger material of radioactivity, due to putting in recent years The material control of penetrating property, the amount for exporting input are limited.Accordingly, it is difficult to negative electrode is set integrally to contain in relatively large-scale discharge lamp Thorium.
Therefore, Patent Document 2 discloses the construction that thorium is only included in the front part of negative electrode, i.e. necessary The local construction containing thorium in position.The negative electrode is by spread engagement by the negative electrode by being formed leading section and tungsten comprising thorium is formed Form part and by forming stem portion and the negative electrode that forms of pure tungsten not comprising thorium forms part and engages and form.
In the negative electrode for possessing this main part, sufficiently high mechanical strength can be obtained at junction surface, even in discharge lamp Light in temperature conditionss, in such as 2000~2400 DEG C, the leading section that can also avoid producing negative electrode comes off the problem of such.
However, in the manufacture method of that above-mentioned negative electrode exist in order to by negative electrode formed part engagement, it is necessary to vacuum plant, The special equipment such as pressue device is heated, and the problem of the cost of these equipment is higher.
In addition, the process that application of vacuum, heating, cooling treatment etc. in bonding process be present needs asking for time Topic.Moreover, the problem of in the presence of causing manufacturing cost also to increase because of manufacturing time length.
In addition, as described above, because thorium is radioactive element, it is therefore desirable to the fully management of misgivings thorium compound, place Reason.
For such case, recently, proposition has comprising lanthana (La2O3), hafnium oxide (HfO2) etc. on-radiation it is dilute There is the negative electrode that metallic compound, barium compound form as emitter stage material (with reference to patent document 3.).
However, using the situation that contains scarce metallic compound, the negative electrode that barium compound forms as emitter stage material Under, the problem of following such be present.
In the negative electrode of discharge lamp, the emitter stage material of electronic emission characteristic is contributed to exist only in the front end sidepiece of the negative electrode Point.Here, it is present in the emitter stage material of the front part of negative electrode because in the front part of negative electrode when lighting of discharge lamp It is heated and evaporates, but moved by emitter stage material from the rear end of negative electrode towards front end, so that the front end sidepiece to the negative electrode Divide supply emitter stage material.
However, compared with by the emitter stage material that thorium compound is formed, it is made up of scarce metallic compound, barium compound Emitter stage material is easier to evaporate in discharge lamp when lighting.If the moreover, emitter stage material evaporation of the front part of negative electrode Speed it is bigger than the speed that emitter stage moves from the rear end of negative electrode towards front end, then the emitter stage material of the front part of negative electrode Use up in advance.Therefore, during the discharge lamp of the material in the emitter stage substance migration included as negative electrode in addition to thorium compound, Illuminating state be present becomes the problem of unstable in advance.Particularly, in the discharge lamp of more than 1kW high input, rare metal Compound, the evaporation of barium compound are notable, hence it is evident that produce illuminating state becomes unstable phenomenon in advance.
Therefore, the present inventors made be configured with the inside of negative electrode with high concentration contain by scarce metallic compound, The negative electrode of the mode of the emitter stage part for the emitter stage material that barium compound is formed.In order to which emitter stage part is configured in negative electrode Portion in main part, it is necessary to form recess.Therefore, recess is formed when to main part cut etc., and matched somebody with somebody in the recess After putting emitter stage part, cutting face is engaged.In this joining process, it is difficult to airtightly engage composition surface each other, connecing Conjunction face forms small gap each other.If making the discharge tube lighting so made, emitter stage material is higher because of vapour pressure And easily evaporate, therefore liquid, steam are produced from the mutual small gap in composition surface to the problem of the ejection of outside.
Prior art literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 11-96965 publications
Patent document 2：Japanese Unexamined Patent Publication 2012-190627 publications
Patent document 3：Japanese Unexamined Patent Publication 2005-519435 publications
The content of the invention
Invent problem to be solved
It is an object of the invention to provide it is a kind of can be by the local negative electrode structure containing emitter stage material in necessary position Turn into, sufficiently high mechanical strength can be also maintained at a high temperature of during lamp is lighted, it is desired so as to stably obtain The short arc discharge lamp for lighting startability.
Even if the emitter stage material that other objects of the present invention are to provide contained by a kind of negative electrode is beyond thorium compound Material, emitter stage material also not to outside spray, can be achieved long-time stable illuminating state short arc discharge lamp.
Another object of the present invention is to provide it is a kind of can by simplicity method with the short time manufacture in necessary portion Position it is local it is containing emitter stage material, at a high temperature of during lamp is lighted under can also maintain the negative electrode of sufficiently high mechanical strength Negative electrode manufacture method.
Means for solving the problems
The short arc discharge lamp of the present invention makes anode in the inside of luminous tube with containing emitter stage material in front part Negative electrode configure form opposed to each other, the short arc discharge lamp is characterised by,
The negative electrode makes multiple negative electrodes form part engagement and be formed,
The fastener for making to be located between each negative electrode formation part by forming part energization to each negative electrode melts, from And a negative electrode containing the emitter stage material is formed part and connect with other negative electrodes formation part for being engaged in negative electrode formation part Close.
In the short arc discharge lamp of the present invention, it is preferred to employ it is following to form, have in the inside of the negative electrode by One negative electrode forms part and other described negative electrodes and forms the confined space that part surrounds, be configured with the confined space containing The not emitter stage part of the emitter stage material of thoriated.
In the short arc discharge lamp of the present invention or following composition, the negative electrode possess main part, the main body Portion has stem portion and the continuous leading section of front end face with the stem portion,
It is that the leading section for forming the leading section forms part that one negative electrode, which forms part, and other described negative electrodes, which form part, is The stem portion for forming the stem portion forms part,
The stem portion, which forms part, has recess, and the recess axially extends, and has opening in cathode side,
The stem portion forms the front end face of the ring-type of part and the leading section forms the rear end face of part via the fastener And engage.
In the short arc discharge lamp of the present invention or following composition, the negative electrode have main part should with holding The electrode axle portion of main part,
It is that the main part for forming main part forms part that one negative electrode, which forms part, and it is to form that other described negative electrodes, which form part, The core rod pieces of electrode axle portion,
The main part, which forms part, has the 1st recess and second recesses, and the 1st recess axially extends, and in negative electrode rear end Side has an opening, and the second recesses and the 1st recess are continuously along axially extending, and with smaller than the internal diameter of the 1st recess Internal diameter,
The bottom surface of ring-type of the 1st recess that the main part is formed in part and the front end face of the core rod pieces via The fastener and engage.
In the short arc discharge lamp of the present invention or it is following form, the fastener by with one negative electrode Form part or other described negative electrodes and form part identical material and form, and integratedly located at one negative electrode formed part and Other described negative electrodes form at least one party of part.
In the short arc discharge lamp of the present invention or it is following form, the fastener from tantalum (Ta), niobium (Nb), Molybdenum (Mo), hafnium (Hf), rhenium (Re) and the tantalum (Ta), niobium (Nb), molybdenum (Mo), hafnium (Hf), rhenium (Re) alloy in select.
The manufacture method of the negative electrode of the present invention is used to manufacture the short-arc type electric discharge for containing emitter stage material in front part The negative electrode of lamp, the manufacture method of the negative electrode are characterised by that the manufacture method of the negative electrode has following process：
By the way that a negative electrode containing emitter stage material is formed into part and is engaged in other the moon of negative electrode formation part The state of fastener is folded between the joined face that pole forms part to be formed in part in each negative electrode to be configured, and to each The individual negative electrode forms part and is powered, so that the fastener melts, a negative electrode is formed into part engages with other negative electrodes formation part.
The manufacture method of the negative electrode of the present invention is characterised by that the negative electrode possesses main part, and the main part has master Cadre and the continuous leading section of front end face with the stem portion,
It is that the leading section for forming leading section forms part that one negative electrode, which forms part, and it is to form that other described negative electrodes, which form part, The stem portion of stem portion forms part,
The manufacture method of the negative electrode has：
Jut formation process, the joined face of at least one party of part and leading section formation part is formed in the stem portion It is upper to form the jut for forming the junction surface；And
Bonding process, part is formed with stem portion formation part or the leading section making the front end of the jut Joined face is opposed and in the state of abutting, form part and the leading section to the stem portion respectively and form part and be powered so that The jut melting, the stem portion is formed into part and leading section formation part welding and engaged.
In the manufacture method of the negative electrode of the present invention, it is preferred that the manufacture method of the negative electrode has cutting process：It is logical Cross in a manner of at least a portion remaining of the weld based on the jut to the connecing for being formed by the bonding process Zoarium is cut, so as to form the leading section of truncated cone shape.
In the manufacture method of the negative electrode of the present invention, it is preferred that the jut is formed as ring-type.
In particular it is preferred that at least one party that part and leading section formation part are formed in the stem portion is formed There is emitter stage part recess, the emitter stage part recess is exposed to the shape of joined face with the emitter stage part containing emitter stage material State houses the emitter stage part, and in this case, the jut is formed at the position for the opening for surrounding emitter stage part recess.
In the manufacture method of the negative electrode of the present invention, it is preferred that the stem portion forms part and is made up of tungsten,
The leading section forms part by being formed doped with the tungsten of emitter stage material.
Invention effect
, can be by the local negative electrode structure containing emitter stage material in necessary position according to the short arc discharge lamp of the present invention It is desired so as to stably obtain as can also maintain sufficiently high mechanical strength at a high temperature of in being lighted even in lamp Light startability.
In addition, surrounded by using part is formed in two negative electrodes airtightly engaged via fastener each other by joined face Confined space in be configured with the composition of emitter stage part, so as to even in discharge lamp when lighting, emitter stage material is not also from connecing Close facing external to spray, the illuminating state of long-time stable can be achieved.
Particularly, form contain by discharge lamp when lighting compared to the emitter stage material being made up of thorium compound more It is exceedingly useful in the case of the negative electrode for holding the emitter stage material that evaporable scarce metallic compound is formed.
According to the manufacture method of the negative electrode of the present invention, can be manufactured by the method for simplicity with the short time at necessary position The local negative electrode containing emitter stage material, in the negative electrode of acquisition, can also maintain mechanical strength at a high temperature of in lighting.
Brief description of the drawings
Fig. 1 be cutting luminous tube a part come represent the present invention short arc discharge lamp an example in composition Illustrate figure.
Fig. 2 is the explanation sectional view of a configuration example of the negative electrode in the short arc discharge lamp for roughly represent the present invention.
Fig. 3 is the composition that the negative electrode for representing to use in an example of the manufacture method of the negative electrode shown in Fig. 2 forms part Explanation sectional view.
Fig. 4 be represent emitter stage part and form fastener sheet metal be configured at as form stem portion negative electrode formed The stem portion of part forms the explanation sectional view of the state of part.
Fig. 5 is to represent that stem portion forms the engagement that part forms part with forming the leading section of part as the negative electrode for forming leading section The explanation sectional view of process.
Fig. 6 is the explanation sectional view for the cutting process for representing the conjugant progress to being obtained via bonding process.
Fig. 7 is to represent that negative electrode forms the explanation sectional view of the composition of part, and the negative electrode forms the manufacture that part is formed in negative electrode The main part used in the other examples of method.
Fig. 8 is to represent to form the shape formed with jut on part in the leading section for forming part as the negative electrode for forming leading section The explanation sectional view of state.
Fig. 9 is that the stem portion for the negative electrode formation part for being denoted as forming stem portion forms the engagement that part forms part with leading section The explanation sectional view of process.
Figure 10 is the explanation sectional view for the cutting process for representing the conjugant progress to being obtained via bonding process.
Figure 11 is the explanation of the configuration example for the main part for roughly representing the negative electrode that negative electrode formation part as shown in Figure 7 is formed Use sectional view.
Figure 12 is the explanation sectional view of the composition of the main part in other configuration examples for roughly represent negative electrode.
Figure 13 is the explanation section view of another configuration example of the negative electrode in the short arc discharge lamp for roughly represent the present invention Figure.
Figure 14 is the structure that the negative electrode for representing to use in an example of the manufacture method of the negative electrode shown in Figure 13 forms part Into explanation sectional view.
Figure 15 is to omit a part to represent the explanation sectional view of another configuration example of negative electrode.
Embodiment
Hereinafter, embodiments of the present invention are described in detail.
Fig. 1 be cutting luminous tube a part come represent the present invention short arc discharge lamp an example in composition Illustrate figure.
The discharge lamp has the luminous tube 10 being for example made up of quartz glass.The luminous tube 10 is empty by internally forming electric discharge Between S and profile be the illuminating part 11 of ellipsoid of revolution shape, and be integrally connected the both ends, simultaneously for being arranged at the illuminating part 11 respectively Formed along the sealing 12 of a shaft-like side and the sealing 13 of the opposing party of managing axially external extension.
In the discharge space S of the luminous tube 10 anode 20 is configured with a manner of mutually opposing along the axial direction of luminous tube 10 And negative electrode 30.
The luminescent substance of the rare gas being sealed with illuminating part 11 in luminous tube 10 such as mercury, xenon etc..
Anode 20 is for example made up of tungsten, and with the electrode axle portion 24 of main part 21 and the holding main part 21.Main part 21 by the axially extending columned central portion 21a along luminous tube 10, the circle for the front end for being successively formed in central portion 21a The leading section 21b of frustum and be successively formed in central portion 21a rear end circular cone shape rearward end 21c form.
The leading section of electrode axle portion 24 in anode 20 is engaged in the rearward end 21c of main element 21, and the electrode axle portion 24 configure in a manner of the axial direction along luminous tube 10 extends from the sealing 12 of a side into discharge space S.In addition, electrode axle portion 24 are embedded in the sealing 12 of a side so as to be supported on the sealing 12 of a side by its base end part.
For example airtightly it is embedded with by molybdenum structure by collapsed seal (shrink seal) in the inside of the sealing 12 of a side Into metal foil (omit diagram).Welded in one end of the metal foil and be electrically connected with the cardinal extremity of electrode axle portion 24.In addition, in gold The other end of category paper tinsel welds and is electrically connected with the outer lead protruded laterally from the outer end of the sealing 12 of a side and (saves sketch map Show).
Negative electrode 30 contains emitter stage material in front part, and with the electricity of the main part 31 and holding main part 31 Pole axis portion 37.The composition of aftermentioned explanation negative electrode 30.
Electrode axle portion 37 in negative electrode 30 is with the sealing 13 along the axial direction of luminous tube 10 from the opposing party into discharge space S The mode of extension configures.In addition, electrode axle portion 37 is embedded in the sealing 13 of the opposing party so as to be supported on this by its base end part The sealing 13 of the opposing party.
The metal foil being made up of molybdenum is for example airtightly embedded with by collapsed seal in the inside of the sealing 13 of the opposing party (omitting diagram).Welded in one end of the metal foil and be electrically connected with the cardinal extremity of electrode axle portion 37.In addition, in the another of metal foil Weld and be electrically connected with the outer lead (omitting diagram) protruded laterally from the outer end of the sealing 13 of the opposing party in end.
In the discharge lamp of this, it is provided with the sealing 12 of a side and the respective end of sealing 13 of the opposing party Lamp holder 16,17.These lamp holders 16,17 are electrically connected in outer lead.
In addition, the discharge lamp of the present invention is vertically lighted sometimes, carry out level is lighted sometimes, and Fig. 1 does not limit this hair The occupation mode of bright discharge lamp.
Fig. 2 is the explanation sectional view of a configuration example of the negative electrode in the short arc discharge lamp of the outline expression present invention.
As described above, negative electrode 30 has main part 31 and keeps the electrode axle portion 37 of the main part 31.
Main part 31 have stem portion 32 and continuously in the stem portion 32 front end face leading section 35, as composition trunk The stem portion that the negative electrode in portion 32 forms part forms part with forming part as the leading section for the negative electrode formation part for forming leading section 35 Engaged via fastener and form main part 31.The closed of part encirclement is formed by these negative electrodes in being internally formed for main part 31 Space M, emitter stage part E is configured with confined space M.
Stem portion 32 is overall to have generally cylindrical shape, and be formed as the leading section of stem portion 32 go towards front end and The circular cone shape that diameter diminishes.The front end face of stem portion 32 has circular shape, and is set to tabular surface.
Stem portion 32 has the columned emitter stage part recess 33 for internally housing emitter stage part E.The emitter stage part Be formed as being open in cathode side (upper end side in Fig. 2) with recess 33, and axially extend.The emitter stage part recess 33 Formed with the state that the emitter stage part is consistent with the central shaft of stem portion 32 with the central shaft of recess 33.
In addition, stem portion 32 rearward end formed with generally cylindrical core rod pieces recess 34, the core rod pieces The core rod pieces for being provided as forming the negative electrode formation part of electrode axle portion 37 with recess 34 are inserted and engaged.The core rod pieces recess 34 in negative electrode rear end side (lower end side in Fig. 2) to be open, and the central shaft and stem portion 32 of core rod pieces recess 34 The consistent state of central shaft is formed.
Stem portion 32 is made up of tungsten part.In the present invention, tungsten part is the material at least containing tungsten as principal component, Emitter stage material, other compositions can be contained.As the tungsten part of composition stem portion 32, such as the matter of purity 99.99 can be used Measure % pure tungsten, doped with tungsten of zirconium oxide that function is played as particle growth inhibitor etc..In addition, in the negative electrode of this In 30, because stem portion formation part and leading section formation part are independent of one another, therefore trunk can be formed with mutually different material Portion 32 and leading section 35.Therefore, stem portion 32 is without containing emitter stage material.
Leading section 35 is formed towards front end and circular cone shape that diameter diminishes, and rear end face is set to tabular surface.
Leading section 35 is made up of the tungsten part containing emitter stage material.Specifically, thorium is being used as emitter stage material In the case of, can be by doped with thorium oxide (ThO2) tungsten (thoriated tungsten) form.Herein, the thorium as emitter stage material is with oxygen Change thorium (ThO2) or the state of thorium (Th) supported in the tungsten as principal component.In addition, using the transmitting not comprising thorium , can be by being formed doped with the tungsten of the scarce metallic compound as emitter stage material in the case of the material of pole.As rare gold Belong to compound, such as lanthana, cerium oxide etc. can be illustrated.
The concentration for the emitter stage material that leading section 35 is included is preferably 0.1~5.0 mass %, and more preferably 0.3 ~2.5 mass %.
In the negative electrode 30, part is formed by stem portion and leading section forms part and airtightly engaged via fastener, from And formed with the confined space M from emitter stage part recess 33.
In the negative electrode 30 of this composition, it is necessary to which using makes the leading section 35 containing emitter stage material and be housed in confined air Between emitter stage part E contacts in M composition.In particular it is preferred that be emitter stage part E and the leading section 35 containing emitter stage material It is close to.
Emitter stage part E in this has the shape being consistent with confined space M shape, such as columned shape, its Front end face (upper surface in Fig. 2) is close to the rear end face of leading section 35.
Emitter stage part E for example forms containing the emitter stage material not comprising thorium, specifically, by high melting point metal materialses with And the sintered body of emitter stage material is formed.
As the high melting point metal materialses for forming emitter stage part E, tungsten, molybdenum etc. can be used.
As the emitter stage material contained in emitter stage part E, can use lanthana, cerium oxide, gadolinium oxide, samarium oxide, The scarce metallic compound of praseodymium oxide, neodymia or hafnium oxide etc..
The concentration of emitter stage material in emitter stage part E is preferably 10~80 mass %, more preferably 20~50 matter Measure %.In the case that the concentration of emitter stage material in emitter stage part E is too small, it is difficult to supply foot to the front end of negative electrode 30 sometimes The emitter stage of enough amounts.As a result, the illuminating state of discharge lamp easily becomes unstable in advance.On the other hand, in emitter stage part E In emitter stage material concentration it is excessive in the case of, because the ratio of the tungsten in emitter stage part E is relatively low, thus oxide also The product that original tape comes is reduced.As a result, the life-span of negative electrode 30 easily shortens.
Fastener in this is for example made up of sheet metal (metal foil) 50, and sandwiched is configured at the annular shape of stem portion 32 Front end face and leading section 35 rear end face between.
The sheet metal 50 is the external diameter of the external diameter with the front end face for meeting stem portion 32 and used with emitter stage part is met Annulus tabular (the reference picture 3 of the through hole 51 of the internal diameter (opening footpath) of recess 33.).So, passed through by having sheet metal 50 Through hole 51, so as to form the composition that the emitter stage part E being configured in confined space M contacts with the rear end face of leading section 35.
Sheet metal 50 by forward end by forming part and stem portion forms the metal material that part is powered to melt and formed. Specifically, sheet metal 50 by with form leading section form part and stem portion formed part material diverse high-melting-point Metal material forms part or stem portion formation part identical material composition with leading section.
As the high melting point metal materialses for forming sheet metal 50, formed using with forming part and stem portion than leading section The low-melting fusing point of part and leading section 35 during with than discharge tube lighting and the high fusing point of temperature of stem portion 32 Metal material.
In addition, sheet metal 50 at junction surface, in this embodiment for leading section 35 rear end face and stem portion 32 front end face it Between at least joint interface formed alloy.Therefore, it is necessary to leading section 35 when the alloy is also with than discharge tube lighting and main The high temperature of the temperature of cadre 32 produces the combination of alloy phase (alloyphase).Moreover, in order to ensure the air-tightness at junction surface, The alloy molten for making the junction surface in discharge tube lighting is needed, avoids the phenomenon of composition surface stripping etc..Therefore, it is necessary to discharge The alloy at junction surface is avoided to produce liquid phase when lamp is lighted.In addition, the maximum temperature for inferring junction surface is 2000~2500 DEG C or so.
And then as sheet metal 50, not with illuminating part 11 in the material that reacts of enclosure in selected.Tool For body, in the case where enclosure is rare gas, do not cause reaction, but in the case of mercury, metal halide, may Cause the reaction between the alloying between mercury and halide.
And then because sheet metal 50 is used as seal member, it is therefore preferred to have ductility.Particularly, passing through In the case that resistance welding is engaged, due to being powered on the basis of pressurization, it is therefore preferred to avoid in pressurization Produce crack.
The reasons why for the above, as form sheet metal 50 high melting point metal materialses, it is preferred to use from tantalum (Ta), The high melting point metal materialses selected in niobium (Nb), molybdenum (Mo), hafnium (Hf), rhenium (Re) or their alloy.
In addition, as fastener, sheet metal 50 can not only be used, additionally it is possible to use the formed body of metal dust.
Electrode axle portion 37 is for example made up of tungsten, is had and is inserted into cylinder of the core rod pieces in stem portion 32 in recess 34 The minor diameter part 38 of shape and the large-diameter portion 39 being formed continuously with the minor diameter part 38.Minor diameter part 38, which has, meets core rod pieces with recessed The external diameter of the internal diameter in portion 34, and front end face is set to tabular surface.Large-diameter portion 39 has bigger with the internal diameter of recess 34 than core rod pieces External diameter.
In the negative electrode 30 of above-mentioned composition, the emitter stage material contained by leading section 35 is due to turning into high temperature in being lighted in lamp And reduce, turn into the atom of thorium or rare metal, because the diffusion of grain circle of tungsten particle, diffusion into the surface and moved to the high front end face of temperature Move and supply.Thus, the work function in cathode face is made reduce, electron emission characteristic is good.
Negative electrode 30 shown in Fig. 2 can for example be manufactured by following mode.
First, as shown in figure 3, preparing respectively as the negative electrode for forming stem portion 32, leading section 35 and electrode axle portion 37 The stem portion for forming part forms part 42, leading section forms part 45, core rod pieces 47.In addition, prepare fastener and emitter stage part E。
Stem portion, which forms part 42, to form circle with metallic object 42a front by forming part in columned stem portion The emitter stage part of column is with recess 33 and forms generally cylindrical core rod pieces recess 34 in rear end side and obtains.Before It is the metallic object for having columned shape that end, which forms part 45, and columned shape has the external diameter that part 42 is formed with stem portion The external diameter of equal size.Core rod pieces 47 can be by being carried out to columned core rod pieces with the front part of metallic object Machining and form minor diameter part 38 to obtain, the core rod pieces metallic object has big with the identical of large-diameter portion 39 that should be formed Small external diameter.The rear end side part of core rod pieces metallic object forms large-diameter portion 39.In addition, form the sheet metal 50 of fastener If form through hole 51 by the assigned position in the metallic object 50a of discoideus sheet is processed as annular shape to shape To obtain.
Emitter stage part E can be manufactured by following mode.First, such as to the high melting point metal materialses by tungsten etc. form Powder and the mixture (mass ratio 1 of powder that is made up of emitter stage material：1) bonding agent of addition stearic acid etc. in, so as to Modulate emission pole part material.Then, emitter stage part is molded with material by moulding pressure etc..By in hydrogen atmosphere Under, such as using the condition that treatment temperature is 1 hour as 1000 DEG C and processing time the formed body of acquisition is heated, so as to right The formed body carries out the pre-sintered processing of degreasing.Then, under reduced pressure, using treatment temperature as such as 1600~2000 DEG C, preferably Be 1700~1900 DEG C, the condition that processing time is such as 1 hour carries out just to the formed body after the pre-sintered processing of degreasing Formula sintering processes, so as to obtain the emitter stage part E being made up of the tungsten sintered body comprising emitter stage material.
Then, enter to be about to stem portion and form the bonding process that part 42 engages with leading section formation part 45 via sheet metal 50. In the bonding process, first, as shown in figure 4, by columned emitter stage part E to form part 42 exposed to being formed stem portion The front end face 42s of joined face mode is configured in the emitter stage part recess 33 for the front that stem portion forms part 42.Separately Outside, by the sheet metal 50 of annular shape so that the state that emitter stage part E front end face exposes is configured before stem portion forms part 42 On end face.Then, leading section formation part 45 is configured on sheet metal 50, before the sheet metal 50 is formed part 42 by stem portion The rear end face 45s for the joined face that end face 42s forms part 45 with forming leading section is clamped.Then, as shown in figure 5, by with edge Direction of engagement (above-below direction in Fig. 5) is formed in the state of part 42 pressurizes with leading section formation part 45 to stem portion and carried out It is powered (resistance welding), so that sheet metal 50 heats, melting.60 in Fig. 5 be electric current supply power supply.Then, it is derived from The metal of the melting of sheet metal 50 is filled and is fused to the front end face 42s and leading section formation part 45 that stem portion forms part 42 Gap between rear end face 45s, so as to form the engagement that stem portion forms part 42 and leading section formation part 45 as shown in Figure 6 Body 48.In the conjugant 48, the opening of emitter stage part recess 33 forms part 45 by leading section and blocked, so as to contain hair Emitter-base bandgap grading part E emitter stage part is airtightly sealed with the inner space of recess 33, forms confined space M.Such bonding process exists Carry out under decompression or under non-active gas atmosphere, preferably carry out under an argon atmosphere.
By the way that the front part of the conjugant so obtained 48 is cut into taper, so as to form main part forerunner Body.Dotted line shown in Fig. 6 represents cutting face.
Then, for example, using treatment temperature be the condition that 1500~2400 DEG C, processing time are 1 hour to main part forerunner Body carries out vacuum heat, so as to form the main part 31 of the negative electrode shown in Fig. 2.Afterwards, the core rod pieces into main part 31 Inserted with recess 34 and engage the minor diameter part 38 of core rod pieces 47.Engagement side as core rod pieces 47 relative to main part 31 Method, it can enumerate such as dot welding method, diffusion welding (DW) connection, plunging.Thereby, it is possible to obtain as purpose negative electrode 30.
The main part 31 of the negative electrode 30 of composition shown in Fig. 2 can form part or stem portion shape by using with leading section Leading section is formed part and stem portion formation part engagement and formed by member identical material as fastener.In this feelings Under condition, being engaged at least one party for making fastener integratedly form part and stem portion formation part located at leading section can be used The composition in face.
The process that the manufacture method of such negative electrode includes for example following (1)~(3).
(1) jut formation process, the joined face of at least one party of part and leading section formation part is formed in stem portion It is upper to form the jut for forming fastener
(2) bonding process, the front end face of jut and main part is formed into part or leading section forms the joined face of part Configured with the state of abutting, stem portion is formed part and form part energization with leading section, so that jut melts, by the stem portion Form part and the leading section forms part welding and forms conjugant
(3) cutting process, to via bonding process in a manner of making at least a portion of weld of jut remaining The conjugant of acquisition is cut, so as to form the leading section of truncated cone shape
(1) jut formation process
As shown in fig. 7, preparing stem portion and forming part 42 part 45 is formed with leading section.The main part forms part 42 and can passed through Part, which is formed, in columned stem portion forms columned emitter stage part recess 33 with the central part of metallic object 42a front And obtain.Leading section forms the columned metal that part 45 is the external diameter with the equal size of external diameter that part 41 is formed with main part Body 45a.
Next, as shown in figure 8, for example form structure in the rear end face 45b for forming the metallic object 45a that leading section forms part 45 Into the jut 55 of fastener.As the forming method of jut 55, such as the method cut by lathe etc. can be enumerated.
The jut 55 of this is surrounding the position around opening of the emitter stage part with recess 33 with throughout the whole of circumference The mode extended allly is formed as circular, and the end face 56 of jut 55 is set to tabular surface.Axial direction of the jut 55 along negative electrode 30 Interception face on end surface shape be, for example, oblong-shaped.
Part 42 is formed in stem portion to be formed in the bonding process of part 45 with leading section, it is preferred to ensure that emitter stage part E Exposed surface and to its periphery carry out welding.Therefore, jut 55 is being surrounded around opening of the emitter stage part with recess 33 Position is formed as circular in a manner of extending by the complete cycle throughout circumference, so as to obtain the front end face for making emitter stage part E The state contacted with the rear end face of leading section 35, and the closed emitter stage part recess 33 of weld portion of its periphery can be utilized. Therefore, it is possible to future, self-electrode part E emitter stage material is securely fed to leading section 35, and can suppress emitter stage thing Matter is spilt.
(hereinafter referred to as " cut the region part being cut that jut 55 necessarily be formed in than cutting process described later Cut part ".) more by negative electrode 30 central shaft side position.
Jut 55 it is highly preferred that 0.1~1.0mm, the width of the end face 56 of jut 55 are preferably 1~3mm Left and right.Jut 55 can also be formed the rear end face 45s of the joined face of leading section formation part 45 middle section with encirclement Mode is formed as multiple annular shapes.
In addition, also shown in experimental example as be described hereinafter, for the viewpoint of bond strength, the area of the end face 56 of jut 55 (Sw) the front end face 42s of joined face or the quilt of composition leading section formation part 45 that stem portion forms part 42 are preferably formed More than 0.3 times of size of the rear end face 45s on composition surface area (S), more preferably less than more than 0.5 times 0.8 times big It is small.
(2) bonding process
As shown in figure 9, by columned emitter stage part E with before the joined face for being formed stem portion formation part 42 End face 42s mode is configured at stem portion and formed in the emitter stage part recess 33 of part 42.Then, make to be formed at leading section and formed The front end face 42s that the end face 56 of the jut 55 of part 45 forms part 42 with stem portion is abutted, and so that leading section forms part 45 The central shaft state consistent with the central shaft that stem portion forms part 42 is opposed to configure.Stem portion is formed into part with maintaining the state 42 form part 45 with leading section is powered with the state pressurizeed along direction of engagement (Fig. 9 above-below directions).Now, by trunk Portion, which forms part 42 and leading section and forms part 45, carries out electrified regulation, the material of parent that can be larger prior to thermal capacity it is only hot The less jut 55 of capacity melts.So, by only melting the jut 55 for being used as fastener, so as to by the He of jut 55 Opposed stem portion forms the front end face 42s bondings of part 42.Thus, stem portion forms part 42 and forms the welding of part 45 with leading section, The conjugant 48 that part 42 and leading section formation part 45 are formed based on stem portion is formed as shown in Figure 10.
Here, in the conjugant 48 of formation, form the front end face 42s of part 42 in stem portion and leading section forms part 45 Rear end face 45s interface is (below, also referred to as " composition surface ".), except the welding of jut 55 by melting part (it is following, Also referred to as " weld ".) region beyond 48X is not fused.
As power on condition, different according to the size of each negative electrode formation part, the size of jut 55, the magnitude of current is, for example, 5,000~10,000A, conduction time are, for example, 5~20 seconds.
This bonding process more than, compared with conventional diffusion engagement, it can be engaged with the short time, and can contract Short manufacturing time.Here, in conventional diffusion engagement, due to being formed in each negative electrode in the joined face of part, below fusing point Temperature engaged with not melting, therefore an engaging time is about 15~20 minutes or so.
In addition, although above-mentioned joint method is not the method completely engaged each other with plane, can also pass through Uniform weld 48X is formed along the circumference on composition surface, so as to obtain the bond strength of the engagement according to composition surface.
The region for existing on composition surface and not being fused is additionally, since, causes the heat of leading section 35 to be difficult to be transmitted to master Cadre 32, and the temperature of leading section 35 is maintained at high temperature, therefore can maintain emitter efficiency.
(3) cutting process
As shown in Figure 10, cut through in a manner of weld 48X at least a portion remaining such as by lathe The conjugant 48 that bonding process is formed, so as to form the master with the negative electrode 30 formed with the actual identical of composition shown in Fig. 2 Body portion 31.The main part 31 so obtained is represented in fig. 11.In the main part 31, part is formed as leading section is formed at The jut 55 of 45 fastener is integrated with stem portion formation part 42.
In cutting process, it is necessary to cut in a manner of weld 48X is not removed all, but for acquisition The viewpoint of the mechanical strength of negative electrode 30, preferably as shown in phantom in Figure 10 such pair compared with weld 48X more outward Cut the part of side.That is, can be locally overlapping with weld 48X although being cut part 48a, but it is preferred that being cut It is more more outward than weld 48X to cut part 48a.
In addition, in the example shown in Figure 10, part 42 is also formed to stem portion with a portion of cutting, but can also Only cut leading section and form part 45.
As described above, there is bonding process in the manufacture method of above-mentioned negative electrode 30, i.e. by being formed to stem portion Part 42 and leading section form part 45 and are powered, and make the front end face 42s that the joined face that stem portion forms part 42 is formed by being folded in The engagement that sheet metal 50 or jut 55 between the rear end face 45s for the joined face for forming part 45 with forming leading section are formed Part heating, melting, stem portion is formed into part 42 and engaged with the leading section formation welding of part 45.Therefore, engaged with conventional diffusion Compare, can be easy and enter to exercise the stem portion that the confined space M that will contain emitter stage part E is divided with the short time and form part 42 form the joining process that airtightly engage of part 45 with leading section, can shorten negative electrode 30 manufacturing time of itself.In addition, obtain Negative electrode 30 in discharge tube lighting at a high temperature of also there is sufficiently high mechanical strength.
Moreover, main part 31 in the negative electrode 30 obtained by above-mentioned manufacture method by joined face each other via connecing The stem portion that component airtightly engages forms in the confined space M that part 42 surrounds with leading section formation part 45 and is configured with emitter stage part 43.Therefore, according to the discharge lamp for possessing this negative electrode 40, even in discharge lamp when lighting, emitter stage material is not also from engagement Facing external sprays, and the illuminating state of long-time stable can be achieved.Particularly, form contain discharge lamp when lighting by phase The emitter stage material that the scarce metallic compound for being easier to evaporate compared with the emitter stage material being made up of thorium compound is formed In the case of negative electrode, the construction of negative electrode 30 involved in the present invention is exceedingly useful.
In the present invention, above-mentioned embodiment is not limited to, can also add various changes.
For example, as long as emitter stage part recess is formed at, stem portion forms part and leading section forms at least one party of part i.e. Can, it can also be formed as shown in Figure 12 in the leading section for forming leading section 35 and emitter stage part recess 33 is formed in part.
In addition, the jut 55 for example as fastener can both be formed at stem portion formation part 42, can also be formed at Stem portion forms part 42 and leading section and forms part 45 this two side.Stem portion, which is formed at, in jut 55 forms part 42 and front end In the case of this two side of portion's formation part 45, the end face 56 of the preferably jut 55 of both sides is formed in a manner of opposed each other.
Moreover, for example jut 55 is not limited to be formed as ring-type, it can also be formed as example discoid.Even in prominent Rise in the case that portion 55 is formed as ring-type or part has the state in gap.In addition, as jut 55 along negative electrode 30 Axial interception face on end surface shape, such as trapezoidal shape, rectangular-shaped etc. can be enumerated, the end face 56 of jut 55 is simultaneously unlimited Due to tabular surface or curved surface.
And then the confined space M for containing emitter stage part E in negative electrode 30 can be used by as the moon for forming main part Pole formed part main part formed part and as the negative electrode formation part for forming electrode axle portion core rod pieces come the structure that divides Into.
Figure 13 is the explanation section view of another configuration example of the negative electrode in the short arc discharge lamp for roughly represent the present invention Figure.
The negative electrode 30 has main part 31 and keeps the electrode axle portion 37 of the main part 31, and the negative electrode 30 makes to lead as composition The main part that the negative electrode in body portion 31 forms part forms part with forming the core rod pieces of part as the negative electrode for forming electrode axle portion 37 Engage and formed via fastener.Main part 31 be internally formed by these negative electrodes formed part encirclement confined space M, Emitter stage part E is configured with confined space M.
The main part 31 of this is overall to have generally cylindrical shape, and is formed as leading section towards front end and diameter change Small circular cone shape.
Main part 31 has the columned 1st recess 31a of the insertion of power pole axle portion 37 and contains emitter stage part E Columned second recesses 31b.1st recess 31a has opening in rear end side (lower end side in Figure 13), and to prolong vertically The mode stretched is formed.Second recesses 31b by with the 1st recess 31a continuously along being formed in a manner of axially extending, and with more recessed than the 1st The small internal diameter of portion 31a internal diameter.1st recess 31a and second recesses 31b is consistent with the central shaft of main part 31 with central shaft State is formed.1st recess 31a bottom surface 351a has circular shape.1st recess 31a bottom surface 31c and second recesses 31b bottom surface is set to tabular surface.
Main part 31 is formed by the tungsten part at least containing emitter stage material in front part.The concentration of emitter stage material For example, 0.1~3.0 mass %.As emitter stage material, can use as the negative electrode 30 shown in pie graph 2 and exemplified with Material.
Electrode axle portion 37 is for example made up of tungsten, has the columned path being inserted into the 1st recess 31a of main part 31 Portion 38 and the columned large-diameter portion 39 being continuously formed with the minor diameter part 38.Minor diameter part 38, which has, meets the 1st recess 31a Internal diameter external diameter, and front end face is set to tabular surface.Large-diameter portion 39 has the external diameter bigger than the 1st recess 31a internal diameter.
In the negative electrode 30, main part forms part and core rod pieces airtightly engage via fastener, so that formed with Confined space M from second recesses 31b.
In the negative electrode 30, it is necessary to using the front part containing emitter stage material in main part 31 and confined space The composition of emitter stage part E contacts in M.In particular it is preferred that emitter stage part E and the front part containing emitter stage material are tight Patch.
Emitter stage part E has with forming the shape phase that part and core rod pieces divide the confined space M formed by main part The shape of symbol, such as it is close to the second recesses of main part 31 with columned shape, its front end face (upper surface in Figure 13) 31b bottom surface.
As the material for forming emitter stage part E, can use as the negative electrode 30 shown in pie graph 2 and exemplified with material Material.
Fastener is for example made up of sheet metal 50, and sandwiched is configured at the 1st recess 31a circular bottom surface 40s and electricity Between the front end face 47s of the minor diameter part 38 in pole axis portion 37 peripheral part.
The external diameter of the sheet metal 50 with the internal diameter for meeting the 1st recess 31a and with the internal diameter for meeting second recesses 31b Circular shape (the reference picture 14 with through hole 51 in (opening footpath).).In addition, in the sheet metal 50 of this, also may be used To be discoid without through hole.
As the material for forming sheet metal 50, can use as the negative electrode shown in pie graph 2 and exemplified with material.
Such negative electrode 30 can for example be manufactured by following mode.
First, as shown in figure 14, prepare main part and form part 40, core rod pieces 47, fastener and emitter stage part E.
Main part forms part 40 and can obtained by following manner, is formed and forms part metal in columned main part 1st recess 31a of body 40a rear end side opening and formed with the continuous second recesses 31b of the 1st recess 31a and by front end Side part is cut into taper.Core rod pieces 47 can by with for forming the outer of the identical size of large-diameter portion 39 The columned core rod pieces in footpath carry out machining with the front part of metallic object and form minor diameter part 38 to obtain.Plug The rear end side part of part metallic object forms large-diameter portion 39.In addition, form fastener sheet metal 50 for example can by Assigned position in the metallic object 50a of discoideus sheet forms through hole 51 and shapes and be processed into annular shape to obtain.Transmitting Pole part E can be manufactured same as mentioned abovely.
Then, enter to be about to main part and form the bonding process that part 40 engages with core rod pieces 47 via sheet metal 50.At this In bonding process, first, columned emitter stage part E is exposed to its front end face and is formed the engaged of main part formation part 40 The 1st recess 31a in face bottom surface 40s mode is configured at main part and formed in the second recesses 31b of part 40.It is in addition, recessed the 1st Sheet metal 50 is configured at the 1st recess 31a bottom by portion 31a bottom surface 40s in the state of the front end face for making emitter stage part E exposes Face 40s.Then, the minor diameter part 38 of core rod pieces 47 is inserted into the 1st recess 31a, utilizes the 1st recess 31a bottom surface 40s and structure Into the front end face 47s grasp sheet metals 50 of the joined face of core rod pieces 47.Afterwards, by along direction of engagement to main part shape Member 40 is powered (resistance welding) in the state of being pressurizeed with core rod pieces 47, so that sheet metal 50 heats, melting. Molten metal from the sheet metal 50 is filled and is fused to the bottom surface 40s for the 1st recess 31a that main part is formed in part 40 Gap between the front end face 47s of core rod pieces 47, so as to form the moon that main part forms part 40 and engaged with core rod pieces 47 Pole presoma.In the negative electrode presoma, second recesses 31b opening is blocked by core rod pieces 47, so as to contain emitter stage Part E second recesses 31b inner space airtightly seals, and forms confined space M.Such joining process under reduced pressure or Carried out under non-active gas atmosphere, but it is preferred that carrying out under an argon atmosphere.
Afterwards, by carrying out vacuum heat to negative electrode presoma to obtain the negative electrode 30 as target.Vacuum heat Condition be, for example, treatment temperature be 2000~2400 DEG C, processing time be 1 hour.
As described above, in the manufacture method of above-mentioned negative electrode 30, there is bonding process, i.e. by main part shape Member 40 and core rod pieces 47 are powered, make as sandwiched configuration form main part formed part 40 joined face it is the 1st recessed The sheet metal 50 of fastener between portion 31a bottom surface 40s and the front end face 47s of the joined face of composition core rod pieces 47 adds Heat, melting, engaged so as to which main part is formed into part 40 and the welding of core rod pieces 47.Therefore, compared with conventional diffusion engagement, Can it is easy and enter to exercise with the short time main part that the confined space M that will contain emitter stage part E is divided formed part 40 with The joining process that core rod pieces 47 airtightly engage, negative electrode 30 manufacturing time of itself can be shortened.In addition, the negative electrode 30 obtained Also there is sufficiently high mechanical strength at a high temperature of in discharge tube lighting.
Moreover, the main part 31 of the negative electrode 30 obtained by above-mentioned manufacture method by joined face each other via by gold In the confined space M that the main part that the fastener that category piece 50 is formed airtightly engages forms part 40 and core rod pieces 47 and surrounded It is configured with emitter stage part E.Therefore, according to the discharge lamp for possessing this negative electrode 40, even in discharge lamp when lighting, emitter stage thing Matter does not also spray from engagement facing external, and the illuminating state of long-time stable can be achieved.Particularly, forming containing by discharging What the scarce metallic compound for being easier to evaporate compared to the emitter stage material being made up of thorium compound when lighting of lamp was formed In the case of the negative electrode of emitter stage material, the construction of negative electrode 30 of the invention is exceedingly useful.
In addition, in negative electrode is such as the composition for locally containing the emitter stage material being made up of thorium in necessary position, It can not also use as shown in Figure 15 and be configured with the composition of emitter stage part in the inside of main part.The main body of the negative electrode of this Portion 31 in addition to not possessing emitter stage part there is the identical of main part 31 with the composition shown in Figure 11 to form substantially.
In the case where manufacturing the main part 31 of negative electrode 30 of this composition, can also use for example with manufacturing shown in Figure 11 Main part 31 method identical method, compared with conventional diffusion engagement, can be easy and trunk be carried out with the short time Portion forms the joining process that part forms part with leading section, can shorten the manufacturing time of negative electrode itself.In addition, the negative electrode obtained is Also there is sufficiently high mechanical strength at a high temperature of making in discharge tube lighting.
Embodiment
(experimental example 1)
In leading section part and stem portion is formed to be formed in the engagement of part, to by spread engage the conjugant that obtains and " projection weld " (below, is also referred to as by the fastener welding for forming the jut by the present invention.) and the conjugant of acquisition Bond strength measured.
Specifically, external diameter φ 15mm, the total length 80mm for by spreading engagement and projection weld be made up of pure tungsten Stem portion forms part (42) and by doped with ThO2Tungsten (ThO2Concentration：2 mass %) form external diameter φ 15mm, total length 80mm leading section forms the engagement of part (45), measures the tensile strength of obtained conjugant respectively.In addition, on projection Welding, formed in leading section in the joined face of part and height 1mm jut (55) is formed as circular.
In addition, suitably change the area Sw (mm of the end face (56) of jut (55)2) carry out the measurement of bond strength. The area of the end face (56) of jut (55) is set to " S in the area for the joined face (45s) that leading section is formed to part (45) (mm2) " when turn into 0.2 × S (mm2)、0.3×S(mm2)、0.5×S(mm2) and S (mm2) size.
[table 1]
According to the result of table 1, confirm in the conjugant of the invention obtained by projection weld, at the end of jut In the case that the area Sw in face is 0.3 × more than S, the bond strength more than diffusion engagement can be obtained.
(experimental example 2)
The ＞ of making example 1 of ＜ conjugants
Via process as shown below, the main part of negative electrode of the making with the composition shown in Figure 15.
(1) jut formation process
Part is formed to each negative electrode in a manner of as following sizes and carries out machining, surface is ground at cleaning Reason, and carried out hydrogen processing with 1000 DEG C.In addition, the jut (55) as fastener, which is formed at leading section, forms part (45).
Stem portion forms the size of part (42)：External diameter is 10mm, total length 18mm
Stem portion forms the material of part (42)：Pure tungsten
Leading section forms the size of part (45)：External diameter is 10mm, total length 10mm
Leading section forms the material of part (45)：Doped with ThO2Tungsten (ThO2Concentration：2 mass %)
The size of jut (55)：External diameter is 7mm, width 2.4mm, is highly 1mm, and the area of end face (56) is front end Portion forms 0.3 times of size of the area of the joined face (45s) of part (45)
(2) bonding process
The end face (56) of jut (55) and leading section is set to form state pair of the joined face (45s) of part (45) to abut Configure with putting, part (42) is formed to stem portion along direction of engagement with the pressurized conditions for the 5kN that pressurizes enters with leading section formation part (45) Row pressurization, and be powered with electric current 10,000A, the power on condition of 10 seconds.
(3) cutting process
After the conjugant formed by bonding process is cut into following sizes, cleaned, and carry out Vacuum Heat Processing, and made the main part (31) (hereinafter referred to as " conjugant (A) " of negative electrode.).The conjugant (A) is for example used as 7kW Xenon lamp negative electrode main part.
The size of conjugant (A)：External diameter is 10mm, and total length 21mm, nose angle is 40 degree
The ＞ of making example 2 of ＜ conjugants
Via process as shown below, the main part of the negative electrode with the composition shown in Figure 11 has been made.
(1) jut formation process
Part is formed to each negative electrode in a manner of as following sizes and carries out machining, surface is ground at cleaning Reason, and carried out hydrogen processing with 1000 DEG C.In addition, jut (55), which is formed at leading section, forms part (45), formed in stem portion Part (42) forms emitter stage part recess (33).
Stem portion forms the size of part (42)：External diameter is 8mm, total length 41.5mm
Stem portion forms the material of part (42)：Pure tungsten
Leading section forms the size of part (45)：External diameter is 8mm, total length 10mm
Leading section forms the material of part (45)：Doped with CeO2Tungsten (CeO2Concentration：2 mass %)
The size of jut (55)：External diameter is 5.6mm, width 1.1mm, is highly 1mm, before the area of end face (56) is End forms 0.3 times of size of the area of the joined face (45s) of part (45)
The size of emitter stage part recess (33)：Aperture is 2.5mm, total length 3mm
The material of emitter stage part (E)：CeO2、ZrO2, W sintered body
(2) bonding process
Emitter stage part (E) is inserted into emitter stage part recess (33), makes the end face (56) of jut (55) with before The joined face (45s) of end formation part (45) is opposed and abuts, and stem portion is formed along direction of engagement with 3kN pressurized conditions Part (42) forms part (45) with leading section and pressurizeed, and is powered with electric current 6,000A, the power on condition of 10 seconds.
(3) cutting process
After the conjugant formed by bonding process is cut into following sizes, cleaned, and carry out Vacuum Heat Processing, and made the main part (31) (hereinafter referred to as " conjugant (B) " of negative electrode.).The conjugant (B) is used as 2kW height Press the main part of the negative electrode of UV lamp.
The size of conjugant (B)：External diameter is 8mm, and total length 50mm, nose angle is 40 degree
The ＞ of making example 3 of ＜ conjugants
In the making example 1 of conjugant, except not forming jut in jut formation process, leading in bonding process Application of vacuum is crossed, heats (1800 DEG C, 7 minutes) and cooling treatment and is diffused outside engagement and handle in the same manner, Make the main part (hereinafter referred to as " conjugant (C) " for the negative electrode contrasted.).
The tensile strength of conjugant (A) by being obtained with upper type, (B) and conjugant (C) is measured, For the bond strength of same degree.
Result more than can confirm, according to the joint method of the projection weld of the present invention, the energy compared with spreading and engaging Enough conjugants that the mechanical strength equal with the conjugant that acquisition is engaged by diffusion can be obtained with short time manufacture.
The ＞ of ＜ embodiments 1
Composition according to Fig. 2, the negative electrode (1) of following specifications is made.
Stem portion forms part：Material=doped with zirconium oxide (ZrO2) tungsten (ZrO2Concentration be 2wt%), maximum outside diameter =12mm, axial length=18mm, internal diameter (the opening footpath of recess)=3.0mm of front end face
Internal diameter=3.0mm of emitter stage part recess
Internal diameter=3.8mm of core rod pieces recess, axial length=8.5mm
Leading section forms part：Material=doped with lanthana (La2O3) and zirconium oxide (ZrO2) tungsten (La2O3Concentration For 2.5wt%, ZrO2Concentration be 0.1wt%), external diameter=12mm of the front end face before cutting, axial length=3.0mm
Emitter stage part：Material=cerium oxide (CeO2) with the sintered body (CeO of tungsten (W)2Mass ratio with W is 1：1), external diameter =2.5mm, axial length=5.0mm
Core rod pieces：Material=tungsten, total length=155mm, external diameter=3.75mm of minor diameter part, the external diameter of large-diameter portion= 6.0mm
Sheet metal：Material=tantalum (Ta), size (size of fastener sheet metal), external diameter=12mm, internal diameter before cutting (aperture of through hole)=3.4mm, thickness=20 μm (maximum 40 μm)
In addition, the manufacturing condition of above-mentioned negative electrode is as described below.
[emitter stage part]
The pre-sintered processing of degreasing：
Under hydrogen atmosphere, treatment temperature=1000 DEG C, processing time=1 hour
Formal sintering processes：(1 × 10 under decompression-5Below Pa), treatment temperature=1800 DEG C, processing time=1 hour
[negative electrode]
Joining process：
It is resistance welded by forming part to stem portion with metallic object and front end component between metallic object, so that connecing Component (fastener sheet metal) heats, melting.
Under argon gas atmosphere, electrical current=10,000A, processing time=10 second
In addition, stem portion formation part metallic object is engaged with core rod pieces by winding and being pressed into tantalum foil.
Vacuum heat：
(1 × 10 under decompression-5Below Pa), treatment temperature=2200 DEG C, processing time=1 hour
Using above-mentioned negative electrode (1), the composition according to Fig. 1 makes the discharge lamp (1) of following specifications.
Luminous tube：Material=quartz glass, maximum inner diameter=109mm
Anode：Material=tungsten, external diameter=35mm, axial length=65mm
Interelectrode distance：9mm
Specified input：7kW
Above-mentioned discharge lamp (1) is lighted by the condition of 35V, electric current for 140A of voltage, is measured until producing flicker Untill lighting time, be 500 hours.In addition, the illumination dimension of the discharge lamp (1) after 500 hours is lighted from starting point Holdup is 60%.
The ＞ of ＜ embodiments 2
Composition according to Figure 13, make the negative electrode (2) of following specifications.
Main element：Material=doped with lanthana (La2O3) and zirconium oxide (ZrO2) tungsten (La2O3Concentration be 2.5wt%, ZrO2Concentration be 0.1wt%), maximum outside diameter=12mm, axial length=21mm
Internal diameter=5.0mm of 1st recess, axial length=11mm, external diameter=5.0mm of bottom surface, the internal diameter of bottom surface= 3.0mm
Internal diameter=3.0mm of second recesses
Emitter stage part：Material=cerium oxide (CeO2) with the sintered body (CeO of tungsten (W)2Mass ratio with W is 1：1), external diameter =2.5mm, axial length=5.0mm
Core rod pieces：Material=tungsten, total length=155mm, external diameter=4.9mm of minor diameter part, external diameter=6.0mm of large-diameter portion
Fastener：Material=tantalum (Ta), external diameter=4.95mm, internal diameter (aperture of through hole)=3.1mm, thickness=20 μm (maximum 40 μm)
In addition, the manufacturing condition of above-mentioned negative electrode is as described below.
[emitter stage part]
The pre-sintered processing of degreasing：
Under hydrogen atmosphere, treatment temperature=1000 DEG C, processing time=1 hour
Formal sintering processes：(1 × 10 under decompression-5Below Pa), treatment temperature=1800 DEG C, processing time=1 hour
[negative electrode]
Joining process：
By to being resistance welded between main element and core rod pieces, so that fastener heating, melting.
Under argon gas atmosphere, electrical current=2,000A, processing time=10 second
Vacuum heat：
(1 × 10 under decompression-5Below Pa), treatment temperature=2200 DEG C, processing time=1 hour
Using above-mentioned negative electrode (2), the composition according to Fig. 1 makes the discharge lamp (2) of following specifications.
Luminous tube：Material=quartz glass, maximum inner diameter=109mm
Anode：Material=tungsten, external diameter=35mm, axial length=65mm
Interelectrode distance：9mm
Specified input：7kW
Above-mentioned discharge lamp (2) is lighted by the condition of 35V, electric current for 140A of voltage, is measured until producing flicker Untill lighting time, be 500 hours.In addition, the illumination dimension of the discharge lamp (2) after 500 hours is lighted from starting point Holdup is 60%.
The ＞ of ＜ comparative examples 1
In addition to being engaged in a manner of without using fastener, handled, made in method similarly to Example 2 The negative electrode (3) contrasted.Moreover, made has with making in example 2 in addition to the negative electrode (3) compared is used Discharge lamp (2) same size discharge lamp (3).
Above-mentioned discharge lamp (3) is lighted by the condition of 35V, electric current for 140A of voltage, is measured until producing flicker Untill lighting time, be 100 hours.In addition, the illumination dimension of the discharge lamp (3) after 100 hours is lighted from starting point Holdup is 50%.
It can be confirmed according to result above, can according to the discharge lamp (1) of embodiment 1 and the discharge lamp (2) of embodiment 2 Realize the illuminating state of long-time stable.
On the other hand, in the discharge lamp (3) of comparative example 1, illuminating state becomes unstable in advance.It is thought that because, In discharge lamp when lighting, emitter stage material from the gap between composition surface, the i.e. bottom surface of the 1st recess of main element with Gap between the front end face of core rod pieces is spilt, and emitter stage material is not fed to front end fully.
Description of reference numerals
10 luminous tubes
11 illuminating parts
The sealing of 12 1 sides
The sealing of 13 the opposing party
16 lamp holders
17 lamp holders
20 anodes
21 main elements
21a central portions
21b leading sections
21c rearward ends
24 electrode axle portions
30 negative electrodes
31 main parts
The recesses of 31a the 1st
31b second recesses
32 stem portions
33 emitter stage part recesses
34 core rod pieces recesses
35 leading sections
37 electrode axle portions
38 minor diameter parts
39 large-diameter portions
40 main parts form part
The bottom surface of the recesses of 40s the 1st
42 stem portions form part
42a stem portions form part metallic object
42s front end faces
45 leading sections form part
45a metallic objects
45s rear end faces
47 core rod pieces
47s front end faces
48 conjugants
48a is cut part
48x welds
50 sheet metals
50a metallic objects
51 through holes
55 juts
56 end faces
60 electric current supply power supplys
E emitter stage parts
M confined spaces
S discharge spaces

Claims (10)

1. a kind of short arc discharge lamp, anode is made in the inside of luminous tube with containing the negative electrode of emitter stage material in front part Configuration is formed opposed to each other, and the short arc discharge lamp is characterised by,
The negative electrode makes multiple negative electrodes form part engagement and be formed,
The fastener for making to be located between each negative electrode formation part by forming part energization to each negative electrode melts, so that A negative electrode containing the emitter stage material forms part and is engaged in other negative electrodes formation part engagement that the negative electrode forms part,
Have in the inside of the negative electrode and the confined air that part and other described negative electrodes form part and surround is formed by one negative electrode Between, the emitter stage part of the emitter stage material containing not thoriated is configured with the confined space,
The negative electrode possesses main part, and the main part has stem portion and the continuous leading section of front end face with the stem portion,
It is that the leading section for forming the leading section forms part that one negative electrode, which forms part, and it is to form that other described negative electrodes, which form part, The stem portion of the stem portion forms part,
The stem portion, which forms part, has recess, and the recess axially extends, and has opening in cathode side,
The rear end face that the stem portion forms the front end face and leading section formation part of the ring-type of part connects via the fastener Close.
2. the short arc discharge lamp recorded such as claim 1, it is characterised in that
The fastener with one negative electrode by forming part or other described negative electrodes form part identical material and formed, and one Part is formed located at one negative electrode body and other described negative electrodes form at least one party of part.
3. a kind of short arc discharge lamp, anode is made in the inside of luminous tube with containing the negative electrode of emitter stage material in front part Configuration is formed opposed to each other, and the short arc discharge lamp is characterised by,
The negative electrode makes multiple negative electrodes form part engagement and be formed,
The fastener for making to be located between each negative electrode formation part by forming part energization to each negative electrode melts, so that A negative electrode containing the emitter stage material forms part and is engaged in other negative electrodes formation part engagement that the negative electrode forms part,
Have in the inside of the negative electrode and the confined air that part and other described negative electrodes form part and surround is formed by one negative electrode Between, the emitter stage part of the emitter stage material containing not thoriated is configured with the confined space,
The negative electrode has main part with keeping the electrode axle portion of the main part,
It is that the main part for forming main part forms part that one negative electrode, which forms part, and it is to form electrode that other described negative electrodes, which form part, The core rod pieces of axle portion,
The main part, which forms part, has the 1st recess and second recesses, and the 1st recess axially extends, and has in negative electrode rear end side There is an opening, the second recesses and the 1st recess are continuously along axially extending, and with smaller than the internal diameter of the 1st recess Footpath,
The bottom surface of the ring-type for the 1st recess that the main part is formed in part and the front end face of the core rod pieces are via described Fastener and engage.
4. the short arc discharge lamp recorded such as claim 3, it is characterised in that
The fastener with one negative electrode by forming part or other described negative electrodes form part identical material and formed, and one Part is formed located at one negative electrode body and other described negative electrodes form at least one party of part.
5. the short arc discharge lamp recorded such as claim 1 or 3, it is characterised in that
The fastener from tantalum (Ta), niobium (Nb), molybdenum (Mo), hafnium (Hf), rhenium (Re) and the tantalum (Ta), niobium (Nb), molybdenum (Mo), Hafnium (Hf), rhenium (Re) alloy in select.
6. a kind of manufacture method of negative electrode, contain the short arc discharge lamp of emitter stage material in front part for manufacturing Negative electrode, it is characterised in that the manufacture method of the negative electrode has following process：
By the way that a negative electrode containing emitter stage material is formed into part and is engaged in other negative electrode shapes of negative electrode formation part The state that member is folded with fastener between the joined face in each negative electrode formation part is configured, and is somebody's turn to do to each Negative electrode forms part and is powered, so that the fastener melts, a negative electrode is formed into part engages with other negative electrodes formation part,
The negative electrode possesses main part, and the main part has stem portion and the continuous leading section of front end face with the stem portion,
It is that the leading section for forming leading section forms part that one negative electrode, which forms part, and it is to form trunk that other described negative electrodes, which form part, The stem portion in portion forms part,
Part is formed in the stem portion and the leading section forms at least one party of part formed with emitter stage part recess, the hair Emitter-base bandgap grading part recess houses the emitter stage part with state of the emitter stage part containing emitter stage material exposed to joined face,
The manufacture method of the negative electrode also has：
Jut formation process, the shape in the joined face at least one party that stem portion formation part and the leading section form part Into the jut for forming the fastener；And
Bonding process, being connect for part is formed with stem portion formation part or the leading section making the front end of the jut Conjunction face is opposed and in the state of abutting, form part and the leading section to the stem portion respectively and form part and be powered, so that described Jut is melted, and the stem portion is formed into part and leading section formation part welding and engaged.
7. such as the manufacture method for the negative electrode that claim 6 is recorded, it is characterised in that have：
Cutting process, by least a portion of the weld based on the jut remaining in a manner of to by the engagement Process and the conjugant that is formed are cut, so as to form the leading section of truncated cone shape.
8. such as the manufacture method for the negative electrode that claim 6 or 7 is recorded, it is characterised in that
The jut is formed as ring-type.
9. such as the manufacture method for the negative electrode that claim 8 is recorded, it is characterised in that
The jut is formed at the position for the opening for surrounding the emitter stage part recess.
10. such as the manufacture method for the negative electrode that claim 6 is recorded, it is characterised in that
The stem portion forms part and is made up of tungsten,
The leading section forms part by being formed doped with the tungsten of emitter stage material.
CN201480037590.3A 2013-10-02 2014-09-18 The manufacture method of the negative electrode of short arc discharge lamp and short arc discharge lamp Active CN105359252B (en)

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JP2013-265193 2013-12-24
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