CN105359252A - Short-arc discharge lamp and short-arc discharge lamp cathode production method - Google Patents

Short-arc discharge lamp and short-arc discharge lamp cathode production method Download PDF

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Publication number
CN105359252A
CN105359252A CN201480037590.3A CN201480037590A CN105359252A CN 105359252 A CN105359252 A CN 105359252A CN 201480037590 A CN201480037590 A CN 201480037590A CN 105359252 A CN105359252 A CN 105359252A
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China
Prior art keywords
negative electrode
leading section
stem portion
emitter
recess
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CN201480037590.3A
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Chinese (zh)
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CN105359252B (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

Provided are a short-arc discharge lamp allowing an anticipated light-starting ability to be obtained stably, and a discharge lamp cathode production method. The short-arc discharge lamp is provided with a cathode formed by joining a plurality of cathode-forming materials, constituted in such a way that one cathode-forming material (35) containing an emitter substance, and another cathode-forming material (32) to be joined with the cathode-forming material are joined by melting a joining material (50), which is interposed between the cathode-forming materials, by electrifying each of the cathode-forming materials.

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 the negative electrode of a kind of short arc discharge lamp and short arc discharge lamp.In particular to a kind of possess comprise the short arc discharge lamp of the negative electrode of emitter material and the manufacture method of this negative electrode in front part.
Background technology
Short arc discharge lamp (following, also referred to as " discharge lamp ".) due to points of proximity light source, therefore by combining with optical system, serve as the light source of the higher exposure device of light gathering efficiency.
In addition, the short arc discharge lamp having enclosed xenon is used as the light source of projecting apparatus etc.
In the past, in the negative electrode of this discharge lamp, light the object of startability for improving, be added be referred to as emitter material, material for making work function reduce.As the emitter material that negative electrode comprises, because and Long-Time Service thorium compound outstanding to the contribution of startability is (with reference to patent documentation 1.)。But thorium is the material that radioactivity is stronger, due to radioactive substance control in recent years, the amount exporting input is limited.Therefore, be difficult in relatively large-scale discharge lamp, make negative electrode entirety containing thorium.
Therefore, Patent Document 2 discloses the structure only comprising thorium in the front part of negative electrode, that is, at the structure of local, the position of necessity containing thorium.This negative electrode by with diffusion bond by by formed leading section and the negative electrode that the tungsten comprising thorium is formed is formed part and by formed stem portion and the negative electrode that the pure tungsten not comprising thorium is formed formed part joint and formed.
In the negative electrode possessing this main part, sufficiently high mechanical strength can be obtained at junction surface, even if the temperature conditions in the lighting of discharge lamp, in such as 2000 ~ 2400 DEG C, the leading section producing negative electrode also can be avoided to come off such problem.
But, exist in the manufacture method of above-mentioned that negative electrode and engage to negative electrode be formed part, need the special equipment such as vacuum plant, heating pressue device, and the problem that the cost of these equipment is higher.
In addition, the operation that there is vacuum treatment, heat treated, cooling processing etc. in bonding process needs the problem of time.And, there is the problem causing manufacturing cost also to increase because manufacturing time is long.
In addition, as described above, because thorium is radioelement, the management of the thorium compound that therefore needs fully to worry, process.
For this situation, recently, propose to have to comprise lanthana (La 2o 3), hafnium oxide (HfO 2) etc. inactive scarce metallic compound, barium compound as the negative electrode of emitter material (with reference to patent documentation 3.)。
But, when using containing scarce metallic compound, the negative electrode of barium compound as emitter material, there is following such problem.
At the negative electrode of discharge lamp, the emitter material contributing to electronic emission characteristic exists only in the front part of this negative electrode.Here, the emitter material being present in the front part of negative electrode because of when the lighting of discharge lamp the front part of negative electrode evaporated by heating, but moved towards front end by the rear end of emitter material from negative electrode, thus to the front part supply emitter material of this negative electrode.
But compared with the emitter material formed with by thorium compound, the emitter material be made up of scarce metallic compound, barium compound more easily evaporates when the lighting of discharge lamp.And if the speed of the emitter material evaporation of the front part of negative electrode is larger towards the speed of front end movement from the rear end of negative electrode than emitter, then the emitter material of the front part of negative electrode is used up in advance.Therefore, when the discharge lamp of the material of emitter substance migration except thorium compound comprised as negative electrode, there is the problem that illuminating state becomes unstable in advance.Particularly, in the discharge lamp that the height of more than 1kW inputs, the evaporation of scarce metallic compound, barium compound is remarkable, obviously produces the phenomenon that illuminating state becomes unstable in advance.
Therefore, the present inventors has made the negative electrode having the mode containing the emitter part of the emitter material be made up of scarce metallic compound, barium compound with high concentration in the internal configurations of negative electrode.In order to emitter part being configured at the inside of negative electrode, need to form recess in main part.Therefore, when main part being carried out to cutting etc. and forming recess, and configure emitter part in this recess after, cutting face is engaged.In this joining process, be difficult to composition surface to engage airtightly each other, form small gap each other on composition surface.The discharge tube lighting so made if make, then emitter material easily evaporates because vapour pressure is higher, therefore produces liquid, the steam problem that small gap each other externally sprays from composition surface.
Prior art document
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 11-96965 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2012-190627 publication
Patent documentation 3: Japanese Unexamined Patent Publication 2005-519435 publication
Summary of the invention
Invent problem to be solved
The object of the present invention is to provide a kind of can being configured at the negative electrode of local, the position of necessity containing emitter material, even if also sufficiently high mechanical strength can be maintained under the high temperature in lamp is lighted, thus stably can obtain the desired short arc discharge lamp lighting startability.
Even if other objects of the present invention are to provide the emitter material contained by a kind of negative electrode to be material beyond thorium compound, emitter material does not also externally spray, and can realize the short arc discharge lamp of the illuminating state of long-time stable.
Even if another object of the present invention is to provide a kind of can contain the manufacture method that also can maintain the negative electrode of the negative electrode of sufficiently high mechanical strength under under the high temperature in lamp is lighted of emitter material by easy method with the local, position that the short time be manufactured on necessity.
For solving the means of problem
Short arc discharge lamp of the present invention makes anode and configures opposed to each other at the negative electrode that front part contains emitter material to form in the inside of luminous tube, the feature of this short arc discharge lamp is,
Described negative electrode makes multiple negative electrode form part joint and be formed, by making to be located in the fastener melting between each this negative electrode formation part to the energising of each this negative electrode formation part, thus a negative electrode formation part containing described emitter material is made to form part joint with other negative electrodes being engaged in this negative electrode formation part.
In short arc discharge lamp of the present invention, preferably adopt following formation, have in the inside of described negative electrode and form part and other negative electrodes described by a described negative electrode and form the confined space that part surrounds, in this confined space, be configured with the emitter part containing the not emitter material of thoriated.
In short arc discharge lamp of the present invention, also can be following formation, described negative electrode possesses main part, and described main part has stem portion and the front end face continuous print leading section with this stem portion,
It is that the leading section forming described leading section forms part that a described negative electrode forms part, and it is that the stem portion forming described stem portion forms part that other negative electrodes described form part,
This backbone components has recess, and described recess extends vertically, and has opening in cathode side,
The front end face that this stem portion forms the ring-type of part engages via described fastener with the rear end face that described leading section forms part.
In short arc discharge lamp of the present invention, also can be following formation, described negative electrode has main part and the electrode axis portion keeping this main part,
It is that the main part forming main part forms part that a described negative electrode forms part, and it is the core rod pieces forming electrode axis portion that other negative electrodes described form part,
This main part forms part and has the 1st recess and the 2nd recess, and described 1st recess extends vertically, and has opening in negative electrode rear end side, and described 2nd recess and the 1st recess extend continuously vertically, and has the internal diameter less than the internal diameter of described 1st recess,
The bottom surface of ring-type and the front end face of described core rod pieces of described 1st recess in described main part formation part engage via described fastener.
In short arc discharge lamp of the present invention, also can be following formation, described fastener is formed by forming with a described negative electrode material that part or other negative electrodes described form part identical, and is located at a described negative electrode integratedly and forms at least one party that part and other negative electrodes described form part.
In short arc discharge lamp of the present invention, also can be following formation, described fastener be selected from the alloy of tantalum (Ta), niobium (Nb), molybdenum (Mo), hafnium (Hf), rhenium (Re) and this tantalum (Ta), niobium (Nb), molybdenum (Mo), hafnium (Hf), rhenium (Re).
The manufacture method of negative electrode of the present invention is for the manufacture of the negative electrode of short arc discharge lamp containing emitter material in front part, and the feature of the manufacture method of described negative electrode is, the manufacture method of described negative electrode has following operation:
Form part be configured to form the state being folded with fastener between the joined face in part at each this negative electrode by negative electrode containing emitter material being formed part and being engaged in other negative electrodes that this negative electrode forms part, and form part energising to each this negative electrode, thus make this fastener melting, this negative electrode formation part is formed part with other negative electrodes and engages.
The feature of the manufacture method of negative electrode of the present invention is, described negative electrode possesses main part, and described main part has stem portion and the front end face continuous print leading section with this stem portion,
It is that the leading section forming leading section forms part that a described negative electrode forms part, and it is that the stem portion forming stem portion forms part that other negative electrodes described form part,
The manufacture method of described negative electrode has:
Jut formation process, is formed in joined face that part and this leading section form at least one party of part in this stem portion and forms the jut forming described junction surface; And
Bonding process, making the front end of described jut and described stem portion form part or described leading section, to form the joined face of part opposed and under the state abutted, part and the energising of this leading section formation part is formed respectively to this stem portion, thus make described jut melting, this stem portion formation part and this leading section are formed part welding and engage.
In the manufacture method of negative electrode of the present invention, preferably, the manufacture method of described negative electrode has cutting process: cut the conjugant formed by described bonding process by the mode remaining at least partially with the weld based on described jut, thus forms the leading section of truncated cone shape.
In the manufacture method of negative electrode of the present invention, preferably, described jut is formed as ring-type.
Particularly, preferably, the at least one party forming part and described leading section formation part in described stem portion is formed with emitter part recess, the state that this emitter part recess is exposed to joined face with the emitter part containing emitter material accommodates described emitter part, in this case, described jut is formed at the position of the opening surrounding emitter part recess.
In the manufacture method of negative electrode of the present invention, preferably, described stem portion forms part and is made up of tungsten,
Described leading section forms part and is made up of the tungsten doped with emitter material.
Invention effect
According to short arc discharge lamp of the present invention, even if also sufficiently high mechanical strength can be maintained by under the high temperature that to be configured to containing the negative electrode of emitter material in local, the position of necessity in lamp is lighted, thus stably can obtain and desired light startability.
In addition, in the confined space that two negative electrodes engaged airtightly via fastener each other by joined face form part encirclement, forming of emitter part is configured with by adopting, even if thus when the lighting of discharge lamp, emitter material does not also externally spray from composition surface, can realize the illuminating state of long-time stable.
Particularly, when forming containing by when more holding the negative electrode of the emitter material that evaporable scarce metallic compound is formed compared to the emitter material be made up of thorium compound during the lighting of discharge lamp, exceedingly useful.
According to the manufacture method of negative electrode of the present invention, the necessary negative electrode of local, position containing emitter material can be manufactured on, in the negative electrode obtained, even if also mechanical strength can be maintained under the high temperature in lighting by easy method with the short time.
Accompanying drawing explanation
Fig. 1 is that a part for cutting luminous tube is to the key diagram of the formation in the example representing short arc discharge lamp of the present invention.
Fig. 2 is the explanation cutaway view of a configuration example of the negative electrode roughly represented in short arc discharge lamp of the present invention.
Fig. 3 represents that the negative electrode used in an example of the manufacture method of the negative electrode shown in Fig. 2 forms the explanation cutaway view of the formation of part.
Fig. 4 represents that the sheet metal of emitter part and formation fastener is configured at the explanation cutaway view of the state forming the stem portion formation part of part as the negative electrode forming stem portion.
Fig. 5 represents that stem portion formation part and the leading section forming part as the negative electrode forming leading section form the explanation cutaway view of the bonding process of part.
Fig. 6 represents the explanation cutaway view to the cutting process that the conjugant obtained via bonding process carries out.
Fig. 7 represents that negative electrode forms the explanation cutaway view of the formation of part, and this negative electrode forms part and is formed in the main part used in other examples of the manufacture method of negative electrode.
Fig. 8 represents that the leading section forming part as the negative electrode forming leading section forms explanation cutaway view part being formed with the state of jut.
Fig. 9 represents that the stem portion forming part as the negative electrode forming stem portion forms the explanation cutaway view that part and leading section form the bonding process of part.
Figure 10 represents the explanation cutaway view to the cutting process that the conjugant obtained via bonding process carries out.
Figure 11 is the explanation cutaway view of the configuration example of the main part roughly representing the negative electrode that negative electrode formation part is as shown in Figure 7 formed.
Figure 12 is the explanation cutaway view of the formation of the main part roughly represented in other configuration examples of negative electrode.
Figure 13 is the explanation cutaway view of another configuration example of the negative electrode roughly represented in short arc discharge lamp of the present invention.
Figure 14 represents that the negative electrode used in an example of the manufacture method of the negative electrode shown in Figure 13 forms the explanation cutaway view of the formation of part.
Figure 15 omits a part of explanation cutaway view representing another configuration example of negative electrode.
Embodiment
Below, embodiments of the present invention are described in detail.
Fig. 1 is that a part for cutting luminous tube is to the key diagram of the formation in the example representing short arc discharge lamp of the present invention.
This discharge lamp has the luminous tube 10 be such as made up of quartz glass.This luminous tube 10 by forming discharge space S in inside and profile is the illuminating part 11 of ellipsoid of revolution shape, and is connected in the two ends of this illuminating part 11 and the sealing 12 of a shaft-like side extended laterally along tubular axis and the sealing 13 of the opposing party are formed respectively integratedly.
Anode 20 and negative electrode 30 is configured with in the mode that the axis along luminous tube 10 is mutually opposing in the discharge space S of this luminous tube 10.
The luminescent substance of the rare gas of such as mercury, xenon etc. etc. is sealed with in illuminating part 11 in luminous tube 10.
Anode 20 is such as made up of tungsten, and has the electrode axis portion 24 of main part 21 and this main part 21 of maintenance.Main part 21 is made up of the rearward end 21c of circular cone shape along the axially extended columned central portion 21a of luminous tube 10, the leading section 21b being formed at the circular cone shape of the front end of this central portion 21a continuously and the rear end that is formed at this central portion 21a continuously.
The leading section in the electrode axis portion 24 in anode 20 is engaged in the rearward end 21c of main element 21, and this electrode axis portion 24 configures in the mode axially extended in discharge space S from the sealing 12 of a side along luminous tube 10.In addition, electrode axis portion 24 is embedded in the sealing 12 of a side by its base end part thus is supported on the sealing 12 of this side.
Such as be embedded with by collapsed seal (shrinkseal) metal forming (omitting diagram) be made up of molybdenum airtightly in the inside of the sealing 12 of a side.The cardinal extremity in electrode axis portion 24 is electrically connected with in one end of this metal forming welding.In addition, weld at the other end of metal forming and be electrically connected with the outer lead (omitting diagram) given prominence to laterally from the outer end of the sealing 12 of a side.
Negative electrode 30 contains emitter material in front part, and has the electrode axis portion 37 of this main part 31 and this main part 31 of maintenance.The formation of aftermentioned explanation negative electrode 30.
Electrode axis portion 37 in negative electrode 30 configures in the mode axially extended in discharge space S from the sealing 13 of the opposing party along luminous tube 10.In addition, electrode axis portion 37 is embedded in the sealing 13 of the opposing party by its base end part thus is supported on the sealing 13 of this opposing party.
Such as be embedded with by collapsed seal the metal forming (omitting diagram) be made up of molybdenum airtightly in the inside of the sealing 13 of the opposing party.The cardinal extremity in electrode axis portion 37 is electrically connected with in one end of this metal forming welding.In addition, weld at the other end of metal forming and be electrically connected with the outer lead (omitting diagram) given prominence to laterally from the outer end of the sealing 13 of the opposing party.
In the discharge lamp of this example, be provided with lamp holder 16,17 in the respective end of the sealing 12 of a side and the sealing 13 of the opposing party.These lamp holders 16,17 are electrically connected on outer lead respectively.
In addition, discharge lamp of the present invention is vertically lighted sometimes, and sometimes carry out level and light, Fig. 1 does not limit the occupation mode of discharge lamp of the present invention.
Fig. 2 is the explanation cutaway view that outline represents a configuration example of the negative electrode in short arc discharge lamp of the present invention.
As described above, negative electrode 30 has main part 31 and keeps the electrode axis portion 37 of this main part 31.
Main part 31 has stem portion 32 and continuously in the leading section 35 of the front end face of this stem portion 32, stem portion formation part and the leading section forming part as the negative electrode forming leading section 35 as the negative electrode forming member of formation stem portion 32 form part and engage via fastener and form main part 31.Be formed with the confined space M being formed part encirclement by these negative electrodes in the inside of main part 31, in this confined space M, be configured with emitter part E.
Stem portion 32 entirety has roughly columned shape, and the leading section being formed as stem portion 32 goes 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 part recess 33 at inside collecting emitter part E.This emitter part recess 33 is formed as at cathode side (upper end side in Fig. 2) opening, and extends vertically.This emitter part recess 33 is formed with the state that the central shaft of this emitter part recess 33 is consistent with the central shaft of stem portion 32.
In addition, be formed with roughly columned core rod pieces recess 34 in the rearward end of stem portion 32, the core rod pieces that this core rod pieces recess 34 is provided as the negative electrode formation part forming electrode axis portion 37 inserts and engages.This core rod pieces is with recess 34 with at negative electrode rear end side (lower end side in Fig. 2) opening, and the central shaft of this core rod pieces recess 34 state consistent with the central shaft of stem portion 32 is formed.
Stem portion 32 is made up of tungsten part.In the present invention, tungsten part at least contains tungsten as the material of principal component, also can contain emitter material, other compositions.As the tungsten part forming stem portion 32, such as, can use the pure tungsten of purity 99.99 quality %, doped with the zirconic tungsten etc. playing function as particle growth inhibitor.In addition, in the negative electrode 30 of this example, because stem portion formation part and leading section form part independently of one another, therefore, it is possible to formed stem portion 32 and leading section 35 with mutually different material.Therefore, stem portion 32 is without the need to containing emitter material.
Leading section 35 is formed as the circular cone shape that the diameter towards front end diminishes, and rear end face is set to tabular surface.
Leading section 35 is made up of the tungsten part containing emitter material.Specifically, when using thorium as emitter material, can by doped with thorium oxide (ThO 2) tungsten (thoriated tungsten) form.Herein, as the thorium of emitter material with thorium oxide (ThO 2) or the state of thorium (Th) supported in as in the tungsten of principal component.In addition, when use does not comprise the emitter material of thorium, can be made up of the tungsten doped with the scarce metallic compound as emitter material.As scarce metallic compound, such as, lanthana, cerium oxide etc. can be illustrated.
Concentration preferably 0.1 ~ 5.0 quality % of the emitter material that leading section 35 comprises, more preferably 0.3 ~ 2.5 quality %.
In this negative electrode 30, form part by stem portion formation part and leading section and engage airtightly via fastener, thus be formed with the confined space M stemming from emitter part recess 33.
In the negative electrode 30 of this formation, the formation that the leading section 35 containing emitter material is contacted with the emitter part E be housed in confined space M must be adopted.Particularly, preferably emitter part E is close to the leading section 35 containing emitter material.
Emitter part E in this example has the shape conformed to the shape of confined space M, such as columned shape, and its front end face (upper surface in Fig. 2) is close to the rear end face of leading section 35.
Emitter part E such as forms containing the emitter material not comprising thorium, specifically, is made up of the sintered body of high melting point metal materials and emitter material.
As the high melting point metal materials forming emitter part E, tungsten, molybdenum etc. can be used.
As the emitter material contained in emitter part E, the scarce metallic compound of lanthana, cerium oxide, gadolinium oxide, samarium oxide, praseodymium oxide, neodymia or hafnium oxide etc. can be used.
Concentration preferably 10 ~ 80 quality % of the emitter material in emitter part E, more preferably 20 ~ 50 quality %.The concentration of the emitter material in emitter part E is too small, be sometimes difficult to the emitter supplying enough amounts to the front end of negative electrode 30.Its result, the illuminating state of discharge lamp easily becomes unstable in advance.On the other hand, the concentration of the emitter material in emitter part E is excessive, because the ratio of the tungsten in emitter part E is lower, the product that therefore reduction of oxide brings reduces.Its result, the life-span of negative electrode 30 easily shortens.
Fastener in this example is such as made up of sheet metal (metal forming) 50, and sandwiched is configured between the circular front end face of stem portion 32 and the rear end face of leading section 35.
This sheet metal 50 for there is the external diameter of the external diameter of the front end face meeting stem portion 32 and the annulus tabular with the through hole 51 of the internal diameter (opening footpath) meeting emitter part recess 33 (with reference to Fig. 3.)。Like this, by making sheet metal 50 have through hole 51, thus form the formation being configured at the emitter part E in confined space M and contacting with the rear end face of leading section 35.
By being formed by forward end that part and stem portion form that part is energized, the metal material of melting is formed sheet metal 50.Specifically, sheet metal 50 by with form leading section and form part and stem portion and form the diverse high melting point metal materials of the material of part or form with leading section the material that part or stem portion form part identical and form.
As forming the high melting point metal materials of sheet metal 50, using to have and form part and stem portion than leading section and form the low-melting fusing point of part and there is the metal material of the fusing point higher than the temperature of the leading section 35 during discharge tube lighting and stem portion 32.
In addition, sheet metal 50 at junction surface, be that at least joint interface between the rear end face of leading section 35 and the front end face of stem portion 32 forms alloy in this embodiment.Therefore, this alloy is needed also to be the combination producing alloy phase (alloyphase) with the temperature higher than the temperature of the leading section 35 during discharge tube lighting and stem portion 32.And, in order to ensure the air-tightness at junction surface, need the alloy molten making this junction surface when discharge tube lighting, avoid the phenomenon of composition surface stripping etc.Therefore, the alloy avoiding junction surface when discharge tube lighting is needed to produce liquid phase.In addition, the maximum temperature at deduction junction surface is about 2000 ~ 2500 DEG C.
And then, as sheet metal 50, select in the material do not reacted with the enclosure in illuminating part 11.Specifically, when enclosure is rare gas, not induce reaction, but when mercury, metal halide, the reaction between alloying between mercury and halide may be caused.
And then, because sheet metal 50 is used as seal member, therefore preferably there is ductility.Particularly, when being engaged by resistance welded, due to the enterprising electricity that works in basis in pressurization, therefore preferably avoid producing crack when pressurizeing.
For above reason, as the high melting point metal materials forming sheet metal 50, preferably use the high melting point metal materials selected from tantalum (Ta), niobium (Nb), molybdenum (Mo), hafnium (Hf), rhenium (Re) or their alloy.
In addition, as fastener, sheet metal 50 can not only be used, the formed body of metal dust can also be used.
Electrode axis portion 37 is such as made up of tungsten, the large-diameter portion 39 having the columned minor diameter part 38 in the core rod pieces recess 34 that is inserted in stem portion 32 and formed continuously with this minor diameter part 38.Minor diameter part 38 has the external diameter of the internal diameter meeting core rod pieces recess 34, and front end face is set to tabular surface.Large-diameter portion 39 has the external diameter larger than the internal diameter of core rod pieces recess 34.
In the negative electrode 30 of above-mentioned formation, the emitter material contained by leading section 35, owing to becoming high temperature in lighting at lamp and reducing, becomes the atom of thorium or rare metal, because of grain circle of tungsten particle spread, diffusion into the surface and move to the front end face that temperature is high and supply.Thus, the work function in cathode face is reduced, and electron emission characteristic is good.
Negative electrode 30 shown in Fig. 2 such as can be manufactured by following mode.
First, as shown in Figure 3, prepare respectively to form part 42, leading section formation part 45, core rod pieces 47 as the stem portion forming stem portion 32, the negative electrode in leading section 35 and electrode axis portion 37 forms part.In addition, fastener and emitter part E is prepared.
Stem portion forms part 42 and can be formed columned emitter part recess 33 by the front forming part metallic object 42a in columned stem portion and formed roughly columned core rod pieces recess 34 in rear end side and obtain.It is the metallic objects with columned shape that leading section forms part 45, and columned shape has the external diameter of the equal size of the external diameter that forms part 42 with stem portion.Core rod pieces 47 can form minor diameter part 38 by carrying out cut to the front part of columned core rod pieces metallic object and obtain, and this core rod pieces metallic object has the external diameter of the size identical with the large-diameter portion 39 that should be formed.The rear end side part of core rod pieces metallic object forms large-diameter portion 39.In addition, the sheet metal 50 forming fastener such as can be shaped by the assigned position formation through hole 51 in the metallic object 50a of discoideus sheet and be processed as circular acquisition.
Emitter part E can be manufactured by following mode.First, such as, to the bonding agent that add stearic acid etc. middle with the mixture (mass ratio 1:1) of the powder be made up of emitter material such as the powder be made up of the high melting point metal materials of tungsten etc., thus modulate emission pole part material.Then, carry out shaping by moulding pressure etc. to emitter part material.By in a hydrogen atmosphere, such as, be 1000 DEG C with treatment temperature and the processing time is 1 hour that condition heats the formed body obtained, thus degreasing presintering process is carried out to this formed body.Then, under reduced pressure, with treatment temperature be such as 1600 ~ 2000 DEG C, preferably 1700 ~ 1900 DEG C, the processing time is that the condition of such as 1 hour carries out formal sintering processes to the formed body after degreasing presintering process, thus obtains the emitter part E be made up of the tungsten sintered body comprising emitter material.
Then, carry out stem portion to be formed part 42 and leading section and form the bonding process that part 45 engages via sheet metal 50.In this bonding process, first, as shown in Figure 4, columned emitter part E is configured at stem portion in the mode of the front end face 42s being exposed to the joined face being formed stem portion formation part 42 to be formed in the emitter part recess 33 of the front of part 42.In addition, circular sheet metal 50 is configured in stem portion with the state making the front end face of emitter part E and expose to be formed on the front end face of part 42.Then, leading section is formed part 42 and be configured on sheet metal 50, this sheet metal 50 is clamped by the rear end face 45s that the front end face 42s of stem portion formation part 42 and formation leading section form the joined face of part 45.Then, as shown in Figure 5, by being energized (resistance welded) to be formed under part 42 and leading section form the state that part 45 pressurizes along direction of engagement (above-below direction in Fig. 5) stem portion, thus sheet metal 50 is heated, melting.In Fig. 5 60 is electric current supply power supplys.Then, the metal stemming from the melting of sheet metal 50 is filled and is fused to stem portion and forms gap between rear end face 45s that the front end face 42s of part 42 and leading section form part 45, thus forms stem portion as shown in Figure 6 and form the conjugant 48 that part 42 and leading section form part 45.In this conjugant 48, the emitter part opening of recess 33 is formed part 45 shutoff by leading section, thus is sealed airtightly the inner space of the emitter part recess 33 containing emitter part E, forms confined space M.Such bonding process under reduced pressure or under non-active gas atmosphere is carried out, and preferably carries out under an argon atmosphere.
By the front part cut of the conjugant so obtained 48 is become taper, thus form main part presoma.Dotted line shown in Fig. 6 represents cutting face.
Then, such as with treatment temperature be 1500 ~ 2400 DEG C, the processing time is that the condition of 1 hour carries out vacuum heat to this main part presoma, thus forms the main part 31 of the negative electrode shown in Fig. 2.Afterwards, insert to the core rod pieces recess 34 in main part 31 and engage the minor diameter part 38 of core rod pieces 47.As the joint method of core rod pieces 47 relative to main part 31, such as dot welding method, diffusion welding (DW) connection, plunging etc. can be enumerated.Thereby, it is possible to obtain as object negative electrode 30.
The main part 31 of the negative electrode 30 of the formation shown in Fig. 2 can form part with leading section or stem portion forms the identical material of part as fastener by using, and leading section is formed part and stem portion formation part joint and formed.In this case, the formation making fastener be located at the joined face of at least one party of leading section formation part and stem portion formation part integratedly can be adopted.
The manufacture method of such negative electrode comprises the operation of such as following (1) ~ (3).
(1) jut formation process, is formed in joined face that part and leading section form at least one party of part in stem portion and forms the jut forming fastener
(2) bonding process, the front end face of jut and main part are formed the joined face that part or leading section form part to configure with the state abutted, make stem portion formation part and leading section form part to be energized, thus make jut melting, this stem portion formation part and this leading section are formed part welding and form conjugant
(3) cutting process, to make the mode remaining at least partially of the weld of jut cut the conjugant obtained via bonding process, thus forms the leading section of truncated cone shape
(1) jut formation process
As shown in Figure 7, prepare stem portion formation part 42 and form part 45 with leading section.This main part forms part 42 and can form columned emitter part recess 33 by the central part of the front forming part metallic object 42a in columned stem portion and obtain.Leading section forms the columned metallic object 45a that part 45 is the external diameters with the equal size of external diameter forming part 41 with main part.
Next, as shown in Figure 8, such as form at the rear end face 45b of the metallic object 45a forming leading section formation part 45 jut 55 forming fastener.As the formation method of jut 55, include, for example and carry out the method for cutting by lathe etc.
The jut 55 of this example position around the opening surrounding emitter part recess 33 with the complete cycle throughout circumference the mode that extends be formed as circular, the end face 56 of jut 55 is set to tabular surface.Jut 55 is such as oblong-shaped along the end surface shape on the intercepting face of the axis of negative electrode 30.
Forming part 42 in stem portion is formed in the bonding process of part 45 with leading section, preferably guarantees the exposed surface of emitter part E and carries out welding to its periphery.Therefore, the position of jut 55 around the opening surrounding emitter part recess 33 with the complete cycle throughout circumference the mode that extends be formed as circular, thus the state that the front end face of emitter part E is contacted with the rear end face of leading section 35 can be obtained, and the weld portion of its periphery airtight emitter part recess 33 can be utilized.Therefore, it is possible to the emitter material of self-electrode part E is reliably supplied to leading section 35 in the future, and emitter material can be suppressed to spill.
Jut 55 must be formed at than the area part be cut in cutting process described later (hereinafter referred to as " being cut part ".) more by the position of the central shaft side of negative electrode 30.
Jut 55 it is highly preferred that 0.1 ~ 1.0mm, width preferably about the 1 ~ 3mm of the end face 56 of jut 55.Jut 55 also can be formed as multiple circular in the mode of the middle section surrounding the rear end face 45s of the joined face being formed leading section formation part 45.
In addition, also as shown in experimental example described later, for the viewpoint of bond strength, the area (Sw) of the end face 56 of jut 55 preferably forms stem portion and forms the front end face 42s of the joined face of part 42 or form the size of more than 0.3 times that leading section forms the area (S) of the rear end face 45s of the joined face of part 45, the more preferably size of more than 0.5 times less than 0.8 times.
(2) bonding process
As shown in Figure 9, columned emitter part E is configured at stem portion in the mode of the front end face 42s being exposed to the joined face being formed stem portion formation part 42 to be formed in the emitter part recess 33 of part 42.Then, make to be formed at the end face 56 that leading section forms the jut 55 of part 45 and abut with the front end face 42s that stem portion forms part 42, and with the central shaft and stem portion that make leading section formation part 45 formed the consistent state of the central shaft of part 42 opposed configure.Stem portion is formed with maintaining this state part 42 to form part 45 with leading section and be energized with the state of pressurizeing along direction of engagement (Fig. 9 above-below direction).Now, carry out electrified regulation by forming part 45 to stem portion formation part 42 and leading section, material ground jut 55 melting that only thermal capacity is less of parent that can be larger prior to thermal capacity.Like this, by only making jut 55 melting as fastener, thus front end face 42s jut 55 and opposed stem portion being formed part 42 is bonding.Thus, stem portion forms part 42 and forms part 45 welding with leading section, forms the conjugant 48 forming part 45 based on stem portion formation part 42 and leading section as shown in Figure 10.
Here, in the conjugant 48 formed, the front end face 42s and the leading section that form part 42 in stem portion form the interface of the rear end face 45s of part 45 (below, also referred to as " composition surface ".), except the part of jut 55 welding by melting is (below, also referred to as " weld ".) region beyond 48X is not fused.
As power on condition, form the size of part, the size of jut 55 and different according to each negative electrode, the magnitude of current is such as 5,000 ~ 10,000A, and conduction time is such as 5 ~ 20 seconds.
According to above this bonding process, compared with diffusion bond in the past, can engage with the short time, and can manufacturing time be shortened.Here, in diffusion bond in the past, owing to being formed in the joined face of part at each negative electrode, engage with the temperature not melting below fusing point, therefore an engaging time is about about 15 ~ 20 minutes.
In addition, although above-mentioned joint method is not carry out with plane the method that engages each other completely, also by forming uniform weld 48X along the circumference on composition surface, thus the bond strength according to the joint on composition surface can be obtained.
And owing to there is the region be not fused on composition surface, cause the heat of leading section 35 to be difficult to be transmitted to stem portion 32, the temperature of leading section 35 is maintained at high temperature, therefore can maintain emitter efficiency.
(3) cutting process
As shown in Figure 10, such as cut through the conjugant 48 of bonding process formation by lathe etc. in the mode remaining at least partially of weld 48X, thus form the main part 31 of the negative electrode 30 with the formation actual identical with the formation shown in Fig. 2.The main part 31 so obtained is represented in fig. 11.In this main part 31, form part 42 as the jut 55 and the stem portion that are formed at leading section and are formed the fastener of part 45 integrated.
In cutting process, must the mode that weld 48X all removes not be cut, but for the viewpoint of mechanical strength of the negative electrode 30 obtained, preferably such as shown in phantom in Figure 10 part more outward compared with weld 48X to be cut.That is, although being cut part 48a can be overlapping with weld 48X local, part 48a is preferably cut more more outward than weld 48X.
In addition, in the example shown in Figure 10, also to stem portion formed part 42 with a portion of cutting, but also can only cut leading section formed part 45.
As described above, in the manufacture method of above-mentioned negative electrode 30, there is bonding process, namely, be energized by forming part 45 to stem portion formation part 42 and leading section, make to form stem portion form that the fastener that the front end face 42s of the joined face of part 42 and the sheet metal 50 formed between rear end face 45s that leading section forms the joined face of part 45 or jut 55 form heats, melting by being folded in, stem portion is formed part 42 and form part 45 welding with leading section and engage.Therefore, compared with diffusion bond in the past, can be easy and carry out making the stem portion that the confined space M containing emitter part E divides being formed part 42 and leading section with the short time and form the joining process that part 45 engages airtightly, the manufacturing time of negative electrode 30 self can be shortened.In addition, even if also there is sufficiently high mechanical strength under the high temperature of the negative electrode of acquisition 30 in discharge tube lighting.
And the main part 31 in the negative electrode 30 obtained by above-mentioned manufacture method is formed part 42 and leading section in the stem portion that engaged airtightly via fastener each other by joined face and is formed in confined space M that part 45 surrounds and be configured with emitter part 43.Therefore, according to the discharge lamp possessing this negative electrode 40, even if when the lighting of discharge lamp, emitter material does not also externally spray from composition surface, can realize the illuminating state of long-time stable.Particularly, when form containing during the lighting of discharge lamp by when more holding the negative electrode of the emitter material that evaporable scarce metallic compound is formed compared to the emitter material be made up of thorium compound, the structure of negative electrode 30 involved in the present invention is exceedingly useful.
In the present invention, be not limited to above-mentioned execution mode, also can add various change.
Such as, as long as emitter part recess is formed at least one party that stem portion forms part and leading section formation part, also can be formed in part at the leading section forming leading section 35 as shown in Figure 12 and form emitter part recess 33.
In addition, such as, jut 55 as fastener both can be formed at stem portion formation part 42, also can be formed at stem portion and form part 42 and this two side of leading section formation part 45.When jut 55 is formed at stem portion formation part 42 and leading section forms this two side of part 45, preferably the end face 56 of the jut 55 of both sides is formed in opposed mode each other.
And such as jut 55 is not limited to be formed as ring-type, also can be formed as such as discoid.Even if when jut 55 is formed as ring-type, it also can be the state that local has gap.In addition, as jut 55 along the end surface shape on the intercepting face of the axis of negative electrode 30, include, for example trapezoidal shape, rectangular-shaped etc., the end face 56 of jut 55 is not limited to tabular surface, also can be curved surface.
And then, the confined space M containing emitter part E in negative electrode 30 can be adopted to form part by the main part forming part as the negative electrode forming main part and forming of forming that the core rod pieces of part divides as the negative electrode forming electrode axis portion.
Figure 13 is the explanation cutaway view of another configuration example of the negative electrode roughly represented in short arc discharge lamp of the present invention.
This negative electrode 30 has main part 31 and keeps the electrode axis portion 37 of this main part 31, and this negative electrode 30 makes the main part formation part as the negative electrode forming member forming main part 31 engage via fastener with the core rod pieces forming part as the negative electrode forming electrode axis portion 37 and be formed.Be formed with the confined space M being formed part encirclement by these negative electrodes in the inside of main part 31, in this confined space M, be configured with emitter part E.
Main part 31 entirety of this example has roughly columned shape, and is formed as the leading section circular cone shape that diameter diminishes towards front end.
Main part 31 has the columned 1st recess 31a that power supply pole axis portion 37 inserts and the columned 2nd recess 31b containing emitter part E.1st recess 31a has opening in rear end side (lower end side in Figure 13), and is formed in the mode extended vertically.2nd recess 31b is formed in the mode extended vertically continuously with the 1st recess 31a, and has the internal diameter less than the internal diameter of the 1st recess 31a.1st recess 31a and the 2nd recess 31b is formed with the state that central shaft is consistent with the central shaft of main part 31.The bottom surface 351a of the 1st recess 31a has circular shape.The bottom surface 31c of the 1st recess 31a and the bottom surface of the 2nd recess 31b are set to tabular surface respectively.
Main part 31 is formed by the tungsten part at least containing emitter material in front part.The concentration of emitter material is such as 0.1 ~ 3.0 quality %.As emitter material, the negative electrode 30 shown in pie graph 2 can be used as and exemplified with material.
Electrode axis portion 37 is such as made up of tungsten, has the columned minor diameter part 38 be inserted in the 1st recess 31a of main part 31 and the columned large-diameter portion 39 formed continuously with this minor diameter part 38.Minor diameter part 38 has the external diameter of the internal diameter meeting the 1st recess 31a, and front end face is set to tabular surface.Large-diameter portion 39 has the external diameter larger than the internal diameter of the 1st recess 31a.
In this negative electrode 30, main part forms part and core rod pieces engages airtightly via fastener, thus is formed with the confined space M stemming from the 2nd recess 31b.
In this negative electrode 30, the formation contacted with the emitter part E in confined space M containing the front part of emitter material in main part 31 must be adopted.Particularly, part E in preferred emission pole is close to the front part containing emitter material.
Emitter part E has the shape conformed to the shape being formed the confined space M that part and core rod pieces divide by main part, such as have columned shape, its front end face (upper surface in Figure 13) is close to the bottom surface of the 2nd recess 31b of main part 31.
As the material forming emitter part E, can be used as the negative electrode 30 shown in pie graph 2 and exemplified with material.
Fastener is such as made up of sheet metal 50, and sandwiched is configured between the circumference of the front end face 47s of the circular bottom surface 40s of the 1st recess 31a and the minor diameter part 38 in electrode axis portion 37.
This sheet metal 50 there is the external diameter of the internal diameter meeting the 1st recess 31a and the circular shape with through hole 51 with the internal diameter (opening footpath) meeting the 2nd recess 31b (with reference to Figure 14.)。In addition, in the sheet metal 50 of this example, also can be discoid that not there is through hole.
As forming the material of sheet metal 50, can be used as the negative electrode shown in pie graph 2 and exemplified with material.
Such negative electrode 30 such as can 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 part E.
Main part is formed part 40 and can be obtained by following manner, is formed in columned main part and forms the 1st recess 31a of the rear end side opening of part metallic object 40a and formed with the 1st recess 31a continuous print the 2nd recess 31b and front part cut is become taper.Core rod pieces 47 can by carrying out cut and form minor diameter part 38 obtaining to the front part had with the columned core rod pieces metallic object of the external diameter for the formation of the identical size of large-diameter portion 39.The rear end side part of core rod pieces metallic object forms large-diameter portion 39.In addition, the sheet metal 50 forming fastener such as can be shaped by the assigned position formation through hole 51 in the metallic object 50a of discoideus sheet and be processed into circular acquisition.Emitter part E can manufacture identically with said method.
Then, the bonding process that part 40 engages via sheet metal 50 with core rod pieces 47 is carried out main part to be formed.In this bonding process, first, the mode columned emitter part E being exposed to the bottom surface 40s of the 1st recess 31a of the joined face being formed main part formation part 40 with its front end face is configured at main part and is formed in the 2nd recess 31b of part 40.In addition, sheet metal 50 is configured at the bottom surface 40s of the 1st recess 31a under the state making the front end face of emitter part E expose at the bottom surface 40s of the 1st recess 31a.Then, the minor diameter part 38 of core rod pieces 47 is inserted into the 1st recess 31a, the front end face 47s grasp sheet metal 50 of the bottom surface 40s utilizing the 1st recess 31a and the joined face forming core rod pieces 47.Afterwards, by being energized (resistance welded) under the state of pressurizeing to main part formation part 40 and core rod pieces 47 along direction of engagement, thus sheet metal 50 is heated, melting.The motlten metal stemming from this sheet metal 50 is filled and is fused to the gap between the bottom surface 40s of the 1st recess 31a in main part formation the part 40 and front end face 47s of core rod pieces 47, thus formation main part forms the negative electrode presoma that part 40 engages with core rod pieces 47.In this negative electrode presoma, the inner space of the 2nd recess 31b containing emitter part E by core rod pieces 47 shutoff, thus seals by the opening of the 2nd recess 31b airtightly, forms confined space M.Such joining process under reduced pressure or under non-active gas atmosphere is carried out, but preferably carries out under an argon atmosphere.
Afterwards, vacuum heat is carried out by target presoma and the negative electrode 30 obtained as target.Such as, treatment temperature is 2000 ~ 2400 DEG C to the condition of vacuum heat, and the processing time is 1 hour.
As described above, in the manufacture method of above-mentioned negative electrode 30, there is bonding process, namely, by being energized to main part formation part 40 and core rod pieces 47, make as sandwiched be configured in form main part formed the 1st recess 31a of the joined face of part 40 bottom surface 40s and form core rod pieces 47 joined face front end face 47s between the sheet metal 50 of fastener heat, melting, thus main part formed part 40 and core rod pieces 47 welding and engage.Therefore, compared with diffusion bond in the past, can be easy and carry out making being formed by the main part that the confined space M containing emitter part E divides with the short time joining process that part 40 engages airtightly with core rod pieces 47, the manufacturing time of negative electrode 30 self can be shortened.In addition, even if also there is sufficiently high mechanical strength under the high temperature of the negative electrode of acquisition 30 in discharge tube lighting.
And, be configured with emitter part E in the confined space M that the main part 31 of the negative electrode 30 obtained by above-mentioned manufacture method is formed part 40 and core rod pieces 47 at the main part engaged airtightly via the fastener be made up of sheet metal 50 each other by joined face and surrounds.Therefore, according to the discharge lamp possessing this negative electrode 40, even if when the lighting of discharge lamp, emitter material does not also externally spray from composition surface, can realize the illuminating state of long-time stable.Particularly, forming containing by when more holding the negative electrode of the emitter material that evaporable scarce metallic compound is formed compared to the emitter material be made up of thorium compound during the lighting of discharge lamp, the structure of negative electrode 30 of the present invention is exceedingly useful.
In addition, negative electrode be such as in local, the position of necessity containing in the forming etc. of the emitter material that is made up of thorium, can not adopt the formation having emitter part in the internal configurations of main part as shown in Figure 15 yet.The main part 31 of the negative electrode of this example, except not possessing emitter part, has the basic comprising identical with the main part 31 of the formation shown in Figure 11.
When main part 31 of the negative electrode 30 of this formation of manufacture, also such as identical with the method manufacturing the main part 31 shown in Figure 11 method can be used, compared with diffusion bond in the past, can be easy and carry out stem portion with the short time and form the joining process that part and leading section form part, the manufacturing time of negative electrode self can be shortened.In addition, even if also there is sufficiently high mechanical strength under the high temperature of the negative electrode of acquisition in discharge tube lighting.
Embodiment
(experimental example 1)
Forming part and stem portion at leading section is formed in the joint of part, to the conjugant obtained by diffusion bond and by the fastener welding that will be made up of jut of the present invention (below, also referred to as " projection weld ".) and the bond strength of the conjugant of acquisition is measured.
Specifically, the external diameter φ 15mm being undertaken being made up of pure tungsten by diffusion bond and projection weld, the stem portion of total length 80mm form part (42) and by doped with ThO 2tungsten (ThO 2concentration: 2 quality %) form external diameter φ 15mm, total length 80mm leading section formed part (45) joint, measure the hot strength of obtained conjugant respectively.In addition, about projection weld, the jut (55) of height 1mm is formed as circular by the joined face of leading section formation part.
In addition, the area Sw (mm of the end face (56) of jut (55) is suitably changed 2) carry out the measurement of bond strength.The area of the end face (56) of jut (55) is set to " S (mm at the area of the joined face (45s) leading section being formed part (45) 2) " time become 0.2 × S (mm 2), 0.3 × S (mm 2), 0.5 × S (mm 2) and S (mm 2) size.
[table 1]
According to the result of table 1, confirm in the conjugant of the present invention obtained by projection weld, when the area Sw of the end face of jut is 0.3 × more than S, the bond strength exceeding diffusion bond can be obtained.
(experimental example 2)
Production example 1 > of < conjugant
Via operation shown below, make the main part with the negative electrode of the formation shown in Figure 15.
(1) jut formation process
Form part in the mode becoming following size to each negative electrode and carry out machining, effects on surface carries out ground and cleaned process, and has carried out hydrogen process with 1000 DEG C.In addition, the jut (55) as fastener is formed at leading section formation part (45).
Stem portion forms the size of part (42): external diameter is 10mm, and total length is 18mm
Stem portion forms the material of part (42): pure tungsten
Leading section forms the size of part (45): external diameter is 10mm, and total length is 10mm
Leading section forms the material of part (45): doped with ThO 2tungsten (ThO 2concentration: 2 quality %)
The size of jut (55): external diameter is 7mm, width is 2.4mm, is highly 1mm, and the area of end face (56) is the size of 0.3 times that leading section forms the area of the joined face (45s) of part (45)
(2) bonding process
The joined face (45s) making the end face of jut (55) (56) and leading section form part (45) with the state abutted opposed configure, form part (42) and leading section along direction of engagement to stem portion with the pressurized conditions of the 5kN that pressurizes to form part (45) and pressurize, and be energized with the power on condition in electric current 10,000A, 10 second.
(3) cutting process
After the conjugant formed by bonding process is cut into following size, clean, and carry out vacuum heat, and the main part (31) having made negative electrode is (hereinafter referred to as " conjugant (A) ".)。This conjugant (A) is such as used as the main part of the negative electrode of the xenon lamp of 7kW.
The size of conjugant (A): external diameter is 10mm, total length is 21mm, and nose angle is 40 degree
Production example 2 > of < conjugant
Via operation shown below, make the main part of the negative electrode with the formation shown in Figure 11.
(1) jut formation process
Form part in the mode becoming following size to each negative electrode and carry out machining, effects on surface carries out ground and cleaned process, and has carried out hydrogen process with 1000 DEG C.In addition, jut (55) is formed at leading section and forms part (45), forms part (42) define emitter part recess (33) in stem portion.
Stem portion forms the size of part (42): external diameter is 8mm, and total length is 41.5mm
Stem portion forms the material of part (42): pure tungsten
Leading section forms the size of part (45): external diameter is 8mm, and total length is 10mm
Leading section forms the material of part (45): doped with CeO 2tungsten (CeO 2concentration: 2 quality %)
The size of jut (55): external diameter is 5.6mm, width is 1.1mm, is highly 1mm, and the area of end face (56) is the size of 0.3 times that leading section forms the area of the joined face (45s) of part (45)
The size of emitter part recess (33): aperture is 2.5mm, total length is 3mm
The material of emitter parts (E): CeO 2, ZrO 2, W sintered body
(2) bonding process
Emitter parts (E) are inserted in emitter part recess (33), the end face of jut (55) (56) and leading section is made to form the joined face (45s) of part (45) opposed and abut, form part (42) and leading section along direction of engagement to stem portion with the pressurized conditions of 3kN to form part (45) and pressurize, and be energized with the power on condition in electric current 6,000A, 10 second.
(3) cutting process
After the conjugant formed by bonding process is cut into following size, clean, and carry out vacuum heat, and the main part (31) having made negative electrode is (hereinafter referred to as " conjugant (B) ".)。This conjugant (B) is used as the main part of the negative electrode of the high pressure UV lamp of 2kW.
The size of conjugant (B): external diameter is 8mm, total length is 50mm, and nose angle is 40 degree
Production example 3 > of < conjugant
In the production example 1 of conjugant, except not forming jut in jut formation process, in bonding process by vacuum treatment, heat treated (1800 DEG C, 7 minutes) and cooling processing carry out processing in the same manner outside diffusion bond, make the main part of the negative electrode of contrasting (hereinafter referred to as " conjugant (C) ".)。
The hot strength of the conjugant (A) by obtaining with upper type, (B) and conjugant (C) being measured, being the bond strength of same degree.
Can confirm according to above result, according to the joint method of projection weld of the present invention, the conjugant that can obtain the mechanical strength equal with the conjugant obtained by diffusion bond can be manufactured with the short time compared with diffusion bond.
< embodiment 1 >
Formation according to Fig. 2, has made the negative electrode (1) of following specification.
Backbone components: material=doped with zirconia (ZrO 2) tungsten (ZrO 2concentration be 2wt%), maximum outside diameter=12mm, axial length=18mm, internal diameter (the opening footpath of the recess)=3.0mm of front end face
Internal diameter=the 3.0mm of emitter part recess
Internal diameter=the 3.8mm of core rod pieces recess, axial length=8.5mm
Leading section forms part: material=and doped with lanthana (La 2o 3) and zirconia (ZrO 2) tungsten (La 2o 3concentration be 2.5wt%, ZrO 2concentration be 0.1wt%), the external diameter=12mm of the front end face before cutting, axial length=3.0mm
Emitter part: material=cerium oxide (CeO 2) with the sintered body (CeO of tungsten (W) 2be 1:1 with the mass ratio of W), external diameter=2.5mm, axial length=5.0mm
Core rod pieces: material=tungsten, total length=155mm, the external diameter=3.75mm of minor diameter part, the external diameter=6.0mm of large-diameter portion
Sheet metal: material=tantalum (Ta), size (size of fastener sheet metal) before cutting, external diameter=12mm, internal diameter (aperture of through hole)=3.4mm, thickness=20 μm (maximum 40 μm)
In addition, the manufacturing condition of above-mentioned negative electrode as described below.
[emitter part]
Degreasing presintering process:
Under hydrogen atmosphere, treatment temperature=1000 DEG C, processing time=1 hour
Formal sintering processes: under decompression (1 × 10 -5below Pa), treatment temperature=1800 DEG C, processing time=1 hour
[negative electrode]
Joining process:
By carrying out resistance welded between backbone components metallic object and front end component metallic object, thus fastener (fastener sheet metal) is heated, melting.
Under argon gas atmosphere, electrical current=10,000A, processing time=10 seconds
In addition, by backbone components metallic object with core rod pieces by reeling and being pressed into tantalum paper tinsel and engaging.
Vacuum heat:
Under decompression (1 × 10 -5below Pa), treatment temperature=2200 DEG C, processing time=1 hour
Use above-mentioned negative electrode (1), the formation according to Fig. 1 makes the discharge lamp (1) of following specification.
Luminous tube: material=quartz glass, maximum inner diameter=109mm
Anode: material=tungsten, external diameter=35mm, axial length=65mm
Interelectrode distance: 9mm
Specified input: 7kW
Take voltage as 35V, electric current is 140A condition makes above-mentioned discharge lamp (1) light, measuring until producing the lighting time till flicker, is 500 hours.In addition, the illumination sustainment rate of the discharge lamp (1) lighted after 500 hours from starting point is 60%.
< embodiment 2 >
Formation according to Figure 13, makes the negative electrode (2) of following specification.
Main element: material=doped with lanthana (La 2o 3) and zirconia (ZrO 2) tungsten (La 2o 3concentration be 2.5wt%, ZrO 2concentration be 0.1wt%), maximum outside diameter=12mm, axial length=21mm
Internal diameter=the 5.0mm of the 1st recess, axial length=11mm, the external diameter=5.0mm of bottom surface, the internal diameter=3.0mm of bottom surface
Internal diameter=the 3.0mm of the 2nd recess
Emitter part: material=cerium oxide (CeO 2) with the sintered body (CeO of tungsten (W) 2be 1:1 with the mass ratio of W), external diameter=2.5mm, axial length=5.0mm
Core rod pieces: material=tungsten, total length=155mm, the external diameter=4.9mm of minor diameter part, the 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 as described below.
[emitter part]
Degreasing presintering process:
Under hydrogen atmosphere, treatment temperature=1000 DEG C, processing time=1 hour
Formal sintering processes: under decompression (1 × 10 -5below Pa), treatment temperature=1800 DEG C, processing time=1 hour
[negative electrode]
Joining process:
By carrying out resistance welded between main element and core rod pieces, thus make fastener heating, melting.
Under argon gas atmosphere, electrical current=2,000A, processing time=10 seconds
Vacuum heat:
Under decompression (1 × 10 -5below Pa), treatment temperature=2200 DEG C, processing time=1 hour
Use above-mentioned negative electrode (2), the formation according to Fig. 1 makes the discharge lamp (2) of following specification.
Luminous tube: material=quartz glass, maximum inner diameter=109mm
Anode: material=tungsten, external diameter=35mm, axial length=65mm
Interelectrode distance: 9mm
Specified input: 7kW
Take voltage as 35V, electric current is 140A condition makes above-mentioned discharge lamp (2) light, measuring until producing the lighting time till flicker, is 500 hours.In addition, the illumination sustainment rate of the discharge lamp (2) lighted after 500 hours from starting point is 60%.
< comparative example 1 >
Except not use except the mode of fastener engages, process with method similarly to Example 2, make the negative electrode (3) of contrasting.And, make, except the negative electrode (3) that use is compared, there is the discharge lamp (3) with the discharge lamp made in example 2 (2) same size.
Take voltage as 35V, electric current is 140A condition makes above-mentioned discharge lamp (3) light, measuring until producing the lighting time till flicker, is 100 hours.In addition, the illumination sustainment rate of the discharge lamp (3) lighted after 100 hours from starting point is 50%.
Can confirm according to above result, according to the discharge lamp (1) of embodiment 1 and the discharge lamp (2) of embodiment 2, the illuminating state of long-time stable can be realized.
On the other hand, in the discharge lamp (3) of comparative example 1, illuminating state becomes unstable in advance.Think this is because, when the lighting of discharge lamp, emitter material spills from the gap between the bottom surface and the front end face of core rod pieces of the 1st recess of composition surface gap, i.e. main element each other, and emitter material is not supplied forward 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 portion
21b leading section
21c rearward end
24 electrode axis portions
30 negative electrodes
31 main parts
31a the 1st recess
31b the 2nd recess
32 stem portion
33 emitter part recesses
34 core rod pieces recesses
35 leading sections
37 electrode axis portions
38 minor diameter parts
39 large-diameter portions
40 main parts form part
The bottom surface of 40s the 1st recess
42 stem portion form part
42a stem portion forms part metallic object
42s front end face
45 leading sections form part
45a metallic object
45s rear end face
47 core rod pieces
47s front end face
48 conjugants
48a is cut part
48x weld
50 sheet metals
50a metallic object
51 through holes
55 juts
56 end faces
60 electric current supply power supplys
E emitter part
M confined space
S discharge space

Claims (12)

1. a short arc discharge lamp, make in the inside of luminous tube anode configure opposed to each other with the negative electrode containing emitter material in front part and form, the feature of described short arc discharge lamp is,
Described negative electrode makes multiple negative electrode form part joint and be formed,
By making to be located in the fastener melting between each this negative electrode formation part to the energising of each this negative electrode formation part, thus a negative electrode formation part containing described emitter material is made to form part joint with other negative electrodes being engaged in this negative electrode formation part.
2., as the short arc discharge lamp that claim 1 is recorded, it is characterized in that,
Have in the inside of described negative electrode and form part and other negative electrodes described by a described negative electrode and form the confined space that part surrounds, in this confined space, be configured with the emitter part containing the not emitter material of thoriated.
3., as the short arc discharge lamp that claim 2 is recorded, it is characterized in that,
Described negative electrode possesses main part, and described main part has stem portion and the front end face continuous print leading section with this stem portion,
It is that the leading section forming described leading section forms part that a described negative electrode forms part, and it is that the stem portion forming described stem portion forms part that other negative electrodes described form part,
This backbone components has recess, and described recess extends vertically, and has opening in cathode side,
The front end face that this stem portion forms the ring-type of part engages via described fastener with the rear end face that described leading section forms part.
4., as the short arc discharge lamp that claim 2 is recorded, it is characterized in that,
Described negative electrode has main part and the electrode axis portion keeping this main part,
It is that the main part forming main part forms part that a described negative electrode forms part, and it is the core rod pieces forming electrode axis portion that other negative electrodes described form part,
This main part forms part and has the 1st recess and the 2nd recess, and described 1st recess extends vertically, and has opening in negative electrode rear end side, and described 2nd recess and the 1st recess extend continuously vertically, and has the internal diameter less than the internal diameter of described 1st recess,
The bottom surface of ring-type and the front end face of described core rod pieces of described 1st recess in described main part formation part engage via described fastener.
5. the short arc discharge lamp recorded any one of claims 1 to 3, is characterized in that,
Described fastener is formed by forming with a described negative electrode material that part or other negative electrodes described form part identical, and is located at a described negative electrode integratedly and forms at least one party that part and other negative electrodes described form part.
6. the short arc discharge lamp recorded any one of Claims 1-4, is characterized in that,
Described fastener is selected from the alloy of tantalum (Ta), niobium (Nb), molybdenum (Mo), hafnium (Hf), rhenium (Re) and this tantalum (Ta), niobium (Nb), molybdenum (Mo), hafnium (Hf), rhenium (Re).
7. a manufacture method for negative electrode, for the manufacture of the negative electrode of short arc discharge lamp containing emitter material in front part, it is characterized in that, the manufacture method of described negative electrode has following operation:
Form part be configured to form the state being folded with fastener between the joined face in part at each this negative electrode by negative electrode containing emitter material being formed part and being engaged in other negative electrodes that this negative electrode forms part, and form part energising to each this negative electrode, thus make this fastener melting, this negative electrode formation part is formed part with other negative electrodes and engages.
8., as the manufacture method of the negative electrode of claim 7 record, it is characterized in that,
Described negative electrode possesses main part, and described main part has stem portion and the front end face continuous print leading section with this stem portion,
It is that the leading section forming leading section forms part that a described negative electrode forms part, and it is that the stem portion forming stem portion forms part that other negative electrodes described form part,
The manufacture method of described negative electrode has:
Jut formation process, is formed in joined face that part and this leading section form at least one party of part in this stem portion and forms the jut forming described junction surface; And
Bonding process, making the front end of described jut and described stem portion form part or described leading section, to form the joined face of part opposed and under the state abutted, part and the energising of this leading section formation part is formed respectively to this stem portion, thus make described jut melting, this stem portion formation part and this leading section are formed part welding and engage.
9., as the manufacture method of the negative electrode of claim 8 record, it is characterized in that having:
Cutting process, is cut the conjugant formed by described bonding process by the mode remaining at least partially with the weld based on described jut, thus forms the leading section of truncated cone shape.
10., as the manufacture method of the negative electrode of claim 8 or 9 record, it is characterized in that,
Described jut is formed as ring-type.
The manufacture method of 11. negative electrodes recorded as claim 10, is characterized in that,
At least one party forming part and described leading section formation part in described stem portion is formed with emitter part recess, and the state that this emitter part recess is exposed to joined face with the emitter part containing emitter material accommodates described emitter part,
Described jut is formed at the position of the opening surrounding this emitter part recess.
The manufacture method of 12. negative electrodes recorded as claim 8, is characterized in that,
Described stem portion forms part and is made up of tungsten,
Described leading section forms part and is made up of the tungsten doped with emitter 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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JP2013207124A JP5825316B2 (en) 2013-10-02 2013-10-02 Short arc type discharge lamp
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JP2013265193A JP5949747B2 (en) 2013-12-24 2013-12-24 Method for producing cathode for discharge lamp and discharge lamp
JP2013-265193 2013-12-24
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