CN102629546A - Electric discharge lamp cathode - Google Patents
Electric discharge lamp cathode Download PDFInfo
- Publication number
- CN102629546A CN102629546A CN2012100236509A CN201210023650A CN102629546A CN 102629546 A CN102629546 A CN 102629546A CN 2012100236509 A CN2012100236509 A CN 2012100236509A CN 201210023650 A CN201210023650 A CN 201210023650A CN 102629546 A CN102629546 A CN 102629546A
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- China
- Prior art keywords
- emitter
- bandgap grading
- base bandgap
- grading material
- discharge lamp
- Prior art date
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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
- 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
- H01J61/0735—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode
-
- 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
- H01J61/0735—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode
- H01J61/0737—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode characterised by the electron emissive material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/84—Lamps with discharge constricted by high pressure
- H01J61/86—Lamps with discharge constricted by high pressure with discharge additionally constricted by close spacing of electrodes, e.g. for optical projection
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- Discharge Lamp (AREA)
Abstract
Provided is an electric discharge lamp cathode. When emitter materials use a cathode of a rare earth serial compound or barium serial compound for a high load short arc discharge lamp, a service life of a lamp can also be prolonged. The electric discharge lamp cathode is a cathode possessed by an electric discharge lamp and is characterized in that the cathode possesses a cathode main body formed by high-melting metal and an emitter material supply source; the inner part of the cathode main body forms an accepting chamber for accepting the emitter material and an emitter material supply source path formed by a hole extending from the accepting chamber to a front end of a cathode; the emitter material supply source path is provided with emitter material supply inhibition parts.
Description
Technical field
The present invention relates to the use for discharge lamp negative electrode that a kind of discharge lamp has.
Background technology
Generally speaking, input power for example the negative electrode of the above high load capacity short arc discharge lamp of 500W be used to make the electronic emission easy emitter-base bandgap grading material (for example with reference to patent documentation 1) that becomes.
But the thorium that for example uses as the emitter-base bandgap grading material is a radioactive substance, therefore need consider fully for management, processing.
Therefore, in the use for discharge lamp negative electrode of short-arc type,, substitute thorium and use the material of rare earth element, barium known (for example with reference to patent documentation 2 and 3) as the emitter-base bandgap grading material.
But; In the time of will using the negative electrode of rare earth based compound, barium based compound be used for the discharge lamp to the higher high load capacity of the heat load of this negative electrode as the emitter-base bandgap grading material; Comprise in the rare earth based compound that the steam pressure of comparing under the same temperature with thorium oxide is big, and the barium monoxide that the reaction through refractory metals such as barium based compound and tungsten generates is compared with thorium oxide; Steam pressure under the same temperature is high; Therefore owing to the premature evaporation of this rare earth based compound, barium based compound, the emitter-base bandgap grading material exhausts too early, and discharge lamp appears in the result can't obtain the problem than the long life.And because the premature evaporation of rare earth based compound, barium based compound has been quickened the melanism progress of luminous tube, discharge lamp appears in the result can't obtain the problem than the long life.
Patent documentation 1: japanese kokai publication hei 11-96965 communique
Patent documentation 2: Japan opens clear 63-9762 communique in fact
Patent documentation 3: japanese kokai publication hei 11-154488 communique
Summary of the invention
The present invention occurs in view of above situation; Its purpose is to provide a kind of use for discharge lamp negative electrode; In the time will using the negative electrode of rare earth based compound, barium based compound to be used for the short arc discharge lamp of high load capacity, discharge lamp be obtained than the long life as the emitter-base bandgap grading material.
Use for discharge lamp negative electrode of the present invention is the negative electrode that discharge lamp has, it is characterized in that,
This negative electrode has: the cathode body, the emitter-base bandgap grading material supply source that constitute by refractory metal,
Form in this cathode body inside: accommodate reception room, the emitter-base bandgap grading material feed path of above-mentioned emitter-base bandgap grading material supply source through forming to the hole of the leading section extension of negative electrode from this reception room,
Be provided with the emitter-base bandgap grading material in the above-mentioned emitter-base bandgap grading material feed path and supply with the inhibition parts.
In use for discharge lamp negative electrode of the present invention, above-mentioned emitter-base bandgap grading material is supplied with the inhibition parts and can be made up of the porous sintered article of refractory metal powder.
In use for discharge lamp negative electrode of the present invention, it can be the porous plastid that is formed by a plurality of wire rods that refractory metal constitutes that above-mentioned emitter-base bandgap grading material is supplied with the inhibition parts.
In use for discharge lamp negative electrode of the present invention, above-mentioned emitter-base bandgap grading material supply source preferably contains at least a emitter-base bandgap grading material that is selected from rare earth based compound and barium based compound.
In use for discharge lamp negative electrode of the present invention, above-mentioned emitter-base bandgap grading material supply source preferably contains and is selected from lanthana, cerium oxide, praseodymium oxide, neodymia, samarium oxide, gadolinium oxide, barium-calcium-aluminate (Ba-Ca-Al-O), barium tungstate (Ba
3WO
6) and at least a emitter-base bandgap grading material of barium-strontium-calcium-tungstates (Ba-Sr-Ca-W-O).
In electrode for discharge lamp of the present invention, above-mentioned emitter-base bandgap grading material supply source preferably contains steam pressure under the predetermined temperature greater than the emitter-base bandgap grading material of thorium oxide.
According to use for discharge lamp negative electrode of the present invention (below be also referred to as " negative electrode "); From the reception room of this cathode body set inside to the emitter-base bandgap grading material feed path that this cathode portion extends, the emitter-base bandgap grading material is set supplies with and suppress parts, thus the quantity delivered of restriction emitter-base bandgap grading material; This emitter-base bandgap grading material is provided to the leading section of negative electrode gradually; Therefore suppressed the too early minimizing of emitter-base bandgap grading material or exhaust too early, and suppressed the too early development of luminous tube melanism, the result can make discharge lamp obtain than the long life.Therefore, according to negative electrode of the present invention, in the time will using the negative electrode of rare earth based compound, barium based compound to be used for the short arc discharge lamp of high load capacity, discharge lamp be obtained than the long life as the emitter-base bandgap grading material.
Description of drawings
Fig. 1 is that sectional view is used in the explanation that expression has a formation in the example of discharge lamp of negative electrode of the present invention.
Fig. 2 is that sectional view is used in the explanation of formation in the example of expression negative electrode of the present invention.
Fig. 3 is that sectional view is used in the explanation of formation in other examples of expression negative electrode of the present invention.
Fig. 4 is that sectional view is used in the explanation of formation in further other examples of expression negative electrode of the present invention.
Fig. 5 is that sectional view is used in the explanation of formation in further other examples of expression negative electrode of the present invention.
Fig. 6 is that sectional view is used in the explanation of formation in further other examples of expression negative electrode of the present invention.
Embodiment
Below specify the present invention.
It for example is the short arc discharge lamp of the above high load capacity of 500W that negative electrode of the present invention can be used for input power.
Fig. 1 is that sectional view use in the explanation that expression has a formation in the example of discharge lamp of negative electrode of the present invention, and Fig. 2 is that sectional view is used in the explanation of representing the formation in the example of negative electrode of the present invention.
The short-arc type xenon lamp that this discharge lamp 10 is high load capacities for example has the luminous tube 11 that is made up of quartz glass.
Luminous tube 11 is made up of following: the illuminating part 12 of oval bulb, lay respectively at the sealing 13 of tubulose at the two ends of this illuminating part 12.In the illuminating part 12 of luminous tube 11, negative electrode 14 and anode 15 relative configurations separated from one another.Negative electrode 14 and anode 15 are supported by the wire rod 17,18 that for example is made up of tungsten respectively.This wire rod 17,18 is extended along tube axial direction in illuminating part 12, and air-tightness is through in the sealing 13, disposes highlightedly to foreign side from the outer end of sealing portion 13.And this wire rod 17,18 connects and keeps with cylindrical shell 16 and be held, and the 13a of graded portion of the outer end through being formed on sealing 13 is encapsulated into sealing 13, and above-mentioned maintenance, for example is made up of quartz glass in sealing 13 with cylindrical shell 16 fixed configurations.
In the illuminating part 12 in luminous tube 11, xenon for example seals with sealing load 0.66MPa.
One to this discharge lamp 10 constitutes the words that example is represented; For example be, the maximum outside diameter of luminous tube 11 (maximum outside diameter of illuminating part 12) is 55.0mm, and the wall thickness of luminous tube 11 is 3.0mm; The separating distance of negative electrode 14 and anode 15 is 6.0mm, and the internal volume of illuminating part 12 is 47cm
3
And discharge lamp 10 is lit a lamp with rated current 80A, rated voltage 25V level, and the interelectrode distance when routine is lit a lamp is 5.3mm, and the tube wall load is 18.2W/cm
2, xenon pressure reaches 2.6MPa.
Anode 15 has the anode body 15A that for example is made up of tungsten, and this anode body 15A is made up of following: round table-like cone portion 151, its front end are tabular surface, along with the path that becomes near this front end; Columned main part 152, integrally formed continuously with this cone portion 151.
One that representes this anode 15 constitutes example: total length 27mm; The axial length of main part 152 is 18.5mm; The diameter of main part 152 is 15mm; The axial length of cone portion 151 is 5mm, and the diameter of the tabular surface of front end is 5mm, and the inclination angle of the relative central shaft of cone portion 151 outer surface is 45 °.
Refractory metal as constituting cathode body 14A for example comprises tungsten, molybdenum etc.In addition, mark 143 is the recesses that form for convenience when making this negative electrode 14.
Inner at cathode body 14A; For example accommodate the reception room that for example forms cylindric space 20, and the emitter-base bandgap grading material feed path 21 that forms through the hole of extending of columned emitter-base bandgap grading material supply source E, become along the central shaft X-shaped of cathode body 14A from this reception room 20 forward end P.
Accommodate the rare earth based compound in the resettlement section 20, particularly accommodate and contain by lanthana (La
2O
3) the emitter-base bandgap grading material supply source E that forms of the emitter-base bandgap grading material that constitutes.
In emitter-base bandgap grading material supply source E, when beginning the discharge of discharge lamp 10, through the temperature rising of cathode body 14A, the temperature of this emitter-base bandgap grading material supply source E also rises, the lanthana (La that contains among the emitter-base bandgap grading material supply source E
2O
3) be reduced, thereby take out metallic atom (La) as the emitter-base bandgap grading material.This emitter-base bandgap grading material (La) radiates, spreads to the leading section of negative electrode 14, thereby as the emitter-base bandgap grading effect.
Emitter-base bandgap grading material supply source does not then have special the qualification as the emitter-base bandgap grading material (metallic atom) as the emitter-base bandgap grading effect can be provided.
Emitter-base bandgap grading material as emitter-base bandgap grading material supply source contains for example comprises lanthana (La
2O
3), lanthanum hexaboride (LaB
6) wait rare earth based compound, barium-calcium-aluminate barium such as (Ba-Ca-Al-O) based compound etc.
In the present invention, emitter-base bandgap grading material supply source preferably contains at least a emitter-base bandgap grading material that is selected from rare earth based compound and barium based compound.
Comprise as the rare earth based compound: the oxide or the boride of the rare earth element that lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), samarium (Sm) or gadolinium (Gd) constitute particularly comprise: lanthana (La
2O
3), cerium oxide (CeO
2), praseodymium oxide (Pr
6O
11), neodymia (Nd
2O
3), samarium oxide (Sm
2O
3), gadolinium oxide (Gd
2O
3) rare-earth oxide; Lanthanum boride (LaB
6), cerium boride (CeB
6), boronation praseodymium (PrB
6), neodymium boride (NdB
6), samarium boride (SmB
6), boronation gadolinium (GdB
6) the terres rares boride.
For example comprise as the barium based compound: barium-calcium-aluminate (Ba-Ca-Al-O), barium tungstate (Ba
3WO
6) and barium-strontium-calcium-tungstates (Ba-Sr-Ca-W-O) etc.
Emitter-base bandgap grading material supply source especially preferably contains and is selected from lanthana (La
2O
3), cerium oxide (CeO
2), praseodymium oxide (Pr
6O
11), neodymia (Nd
2O
3), samarium oxide (Sm
2O
3), gadolinium oxide (Gd
2O
3) rare-earth oxide, barium-calcium-aluminate (Ba-Ca-Al-O), barium tungstate (Ba
3WO
6) and at least a emitter-base bandgap grading material of barium-strontium-calcium-tungstates (Ba-Sr-Ca-W-O).
And in the present invention, emitter-base bandgap grading material supply source preferably contains steam pressure under the predetermined temperature greater than thorium oxide (ThO
2) the emitter-base bandgap grading material.
Particularly, the thorium oxide (Th0 under the 3000K for example
2) steam pressure be 9.4 * 10 [Pa], so emitter-base bandgap grading material supply source preferably to contain steam pressure under the 3000K be the above emitter-base bandgap grading materials of 9.4 * 10 [Pa].
As the steam pressure under the 3000K is the above emitter-base bandgap grading materials of 9.4 * 10 [Pa], comprises lanthana (1.7 * 10
3[Pa]), cerium oxide (5.7 * 10
4[Pa]), praseodymium oxide (1.5 * 10
3[Pa]), neodymia (1.3 * 10
3[Pa]), samarium oxide (5.0 * 10
2[Pa]), gadolinium oxide (2.1 * 10
2[Pa]), barium monoxide (3.4 * 10
4[Pa]) etc.In addition, the value shown in the bracket is the steam pressure under the 3000K.
The barium monoxide that reaction through refractory metals such as this rare-earth oxide and barium based compound and tungsten generates, steam pressure is greater than thorium oxide (ThO
2), but in the present invention, when the negative electrode 14 that uses this emitter-base bandgap grading material is used for the discharge lamp 10 as the high load capacity short-arc type, supplies with and suppress parts 22 through following emitter-base bandgap grading material is set, the emitter-base bandgap grading material can not reduce or exhaust too early too early, and is therefore particularly effective.
In addition, in the present invention,, contain by above-mentioned lanthanum boride (LaB as emitter-base bandgap grading material supply source
6), cerium boride (CeB
6), boronation praseodymium (PrB
6), neodymium boride (NdB
6), samarium boride (SmB
6), boronation gadolinium (GdB
6) the terres rares boride constitute the emitter-base bandgap grading material time; Because of the fusing point of these terres rares borides is lower, preferably in cathode body 14A inside, be formed on the position below the fusing point of above-mentioned terres rares boride so accommodate the reception room 20 of emitter-base bandgap grading material supply source E.
And emitter-base bandgap grading material supply source preferably emitter-base bandgap grading material is carried the sintered body that forms by porous matter tungsten.
This emitter-base bandgap grading material supply source for example can be made as follows.
With pulverous emitter-base bandgap grading material, and pulverous tungsten of average grain diameter 3～5 μ m with mass ratio (emitter-base bandgap grading material/tungsten) by 2/10 mixed; This mixture is added the stearic acid about 2 quality %; Be heated to 100～200 ℃, the particle surface of mixture form by stearic acid constitute by overlay film.Then to having formed, form the punching press body that the mixture by emitter-base bandgap grading material and tungsten constitutes by the punching press of pressurizeing of the mixture of overlay film.And, in nitrogen atmosphere, fire with 1000～1200 ℃ temporarily, in a vacuum or in the reducing atmosphere, formally fire with 1400～1600 ℃, thereby obtain.
The mixing quality of pulverous emitter-base bandgap grading material and pulverous tungsten is than (emitter-base bandgap grading material/tungsten) 1/10～3/10 ratio preferably.
In addition, this emitter-base bandgap grading material supply source E can obtain as follows: when making negative electrode 14, above-mentioned punching press body is configured in the reception room 20 firing temporarily, and wire rod 17 is inserted and is fixed to the recess 143 among the cathode body 14A, carry out the heat treatment of high temperature.
Form in the hole of emitter-base bandgap grading material feed path 21, form with reception room 20 continuously and have with the 1st hole 21a in the columned space of this reception room 20 same internal diameters and the 2nd hole 21b in the columned space that formation has the internal diameter littler than the internal diameter of the 1st hole 21a to become along the central shaft X-shaped of cathode body 14A continuously.
In the 1st hole 21a that forms emitter-base bandgap grading material supply road 21, for example dispose columned emitter-base bandgap grading material and supply with inhibition parts 22.And the end at the 2nd hole 21b that forms emitter-base bandgap grading material feed path 21 is provided with the opening 23 that the emitter-base bandgap grading material is provided to front end P.
Among the cathode body 14A in this example, the 1st hole 21a, the 2nd hole 21b, reception room 20 and recess 143 are communicated with formation.
The hole that forms emitter-base bandgap grading material feed path 21 forms like the leading section ground that makes the emitter-base bandgap grading material be provided to negative electrode 14, and then shape, size etc. are not special limits, and can supply with the formation that suppresses parts 22 and suitably change according to formation, the emitter-base bandgap grading material of cathode body 14A.
Particularly, the length L of the 1st hole 21a for example is 2～20mm, and the inside diameter D of the 1st hole 21a for example is 1～5mm, and the length 1 of the 2nd hole 21b for example is 1～10mm, and the inner diameter d of the 2nd hole 21b (opening 23) for example is 0.1～1.0mm.
The emitter-base bandgap grading material supply that is arranged on emitter-base bandgap grading material feed path 21 suppresses parts 22 and has following function: limit the quantity delivered of emitter-base bandgap grading material, this emitter-base bandgap grading material is provided to gradually the leading section of negative electrode 14.
The emitter-base bandgap grading material is supplied with inhibition parts 22 and is arranged on the emitter-base bandgap grading material feed path 21; So that supply with the leading section that inhibition parts 22 are provided to negative electrode 14 from the emitter-base bandgap grading material supply source E that is housed in the reception room 20 by this emitter-base bandgap grading material as the emitter-base bandgap grading object of emitter-base bandgap grading effect; Then shape, size, allocation position etc. are not special limits, and can suitably change.
Emitter-base bandgap grading material supply inhibition parts 22 in this example are made up of the porous sintered article of refractory metal powder.It is porous sintered articles of refractory metal powder that the emitter-base bandgap grading material is supplied with inhibition parts 22; The space that has through this porous sintered article; Guarantee the mobile route of emitter-base bandgap grading material; And limiting the quantity delivered of this emitter-base bandgap grading material, this emitter-base bandgap grading material is provided to the leading section of negative electrode 14 gradually, has therefore suppressed the too early minimizing of emitter-base bandgap grading material or exhausts too early.
As the refractory metal powder, for example comprise tungsten, tantalum etc., preferred 2～5 μ m of average grain diameter.And, the voidage of porous sintered article preferred 20～50%, further preferred 30～40%.
One that representes this negative electrode 14 constitutes example: total length 15.5mm; The axial length of main part 142 is 10mm, and the diameter of main part 142 is 8mm, and the axial length of cone portion 141 is 5.5mm; The diameter of the tabular surface of front end P is 0.6mm; The inclination angle of the relative central shaft X of outer surface in the cone portion 141 is 40 °, and the length L of the 1st hole 21a in the emitter-base bandgap grading material feed path 21 is 5mm, and the inside diameter D of the 1st hole 21a is 3mm; The length 1 of the 2nd hole 21b is 5mm, and the inner diameter d of the 2nd hole 21b (opening 23) is 0.2mm.
When this discharge lamp 10 begins to discharge; In negative electrode 14, the emitter-base bandgap grading material supply source E that from reception room 20, accommodates, supplies with and suppresses the space that parts 22 have through being configured in emitter-base bandgap grading material among the 1st hole 21a in emitter-base bandgap grading material feed path 21 as the emitter-base bandgap grading material (La) of emitter-base bandgap grading effect; Guarantee mobile route; And the restriction quantity delivered, via the 2nd hole 21b, be provided to the front end P of cathode body 14A gradually from opening 23.And this emitter-base bandgap grading material (La) radiates, spreads to front end P and the periphery thereof of cathode body 14A, thereby as the emitter-base bandgap grading effect.
According to above-mentioned negative electrode 14; From being arranged on the inner reception room 20 of this cathode body 14A to the emitter-base bandgap grading material feed path 21 that the front end P of this cathode body 14 extends, the emitter-base bandgap grading material is set supplies with inhibition parts 22, thus the quantity delivered of restriction emitter-base bandgap grading material; This emitter-base bandgap grading material is provided to the leading section of negative electrode 14 gradually; Therefore suppressed the too early minimizing of emitter-base bandgap grading material or exhaust too early, and suppressed the too early development of the melanism of luminous tube 11, the result can make discharge lamp obtain long useful life.
Execution mode of the present invention more than has been described, but has been the invention is not restricted to above-mentioned execution mode, can carry out various changes.
For example, the emitter-base bandgap grading material is supplied with the quantity delivered that suppresses parts 22 restriction emitter-base bandgap grading materials, and have the function that this emitter-base bandgap grading material is provided to the leading section of negative electrode 14 gradually and get final product, for example can be the porous plastid that forms by a plurality of wire rods that refractory metals such as tungsten constitute.When the emitter-base bandgap grading material supply with to suppress parts 22 and is the porous plastid that is formed by a plurality of wire rods that refractory metal constitutes, as shown in Figure 3, can be the formation that wire rod is disposed on the emitter-base bandgap grading material feed path 21 at the bearing of trend of this wire rod.According to this formation, through the gap between wire rod, when guaranteeing the mobile route of emitter-base bandgap grading material, can limit the quantity delivered of emitter-base bandgap grading material, therefore this emitter-base bandgap grading material is provided to the leading section of negative electrode 14 gradually, has suppressed the too early minimizing of emitter-base bandgap grading material or exhausts too early.
And; The leading section ground that the emitter-base bandgap grading material feed path 21 that for example forms through the hole makes the emitter-base bandgap grading material be provided to negative electrode 14 is provided with and gets final product; As shown in Figure 4; Emitter-base bandgap grading material feed path 21 by configuration emitter-base bandgap grading material supply with the 1st hole 21a that suppresses parts 22, and a plurality of (being 2 in this example) the 2nd hole 21b, the 3rd hole 21c constitute, this hole 21b, 21c are provided with formation from the 1st hole 21a to the cone portion 141 of cathode body 14A respectively with extending.
Further; For example emitter-base bandgap grading material supply inhibition parts 22 are arranged on the emitter-base bandgap grading material feed path 21; So that the emitter-base bandgap grading material gets final product via the leading section that these emitter-base bandgap grading material supply inhibition parts 22 are provided to negative electrode 14; As shown in Figure 5, also can be arranged to emitter-base bandgap grading material supply inhibition parts 22 reception room 20 is wrapped in inside.
Further; The emitter-base bandgap grading material that for example accommodating the emitter-base bandgap grading material provides the reception room 20 of source E to be arranged among this emitter-base bandgap grading material supply source E gets final product via the leading section that emitter-base bandgap grading material supply inhibition parts 22 are provided to negative electrode 14; As shown in Figure 6, reception room 20 can be the formation of the position of side (below one side among Fig. 6) off normal that is arranged at the main part 142 in cathode body 14A.In addition, mark 30 is caps of sealing reception room 20, the 31st, and the screw component of fixed cover portion.
(embodiment)
Specific embodiment of the present invention below is described, but is the invention is not restricted to this.
(embodiment 1)
Produce the negative electrode (1) of following specification according to formation shown in Figure 2.
Cathode body (14A): tungsten system; The axial length of main part (142): 5.5mm; The diameter of main part (142): 8mm; The axial length of cone portion (141): 10mm, the diameter of the tabular surface of front end (P): 0.6mm, the outer surface in the cone portion (141) are with respect to the inclination angle of central shaft (X): 40 °.
Emitter-base bandgap grading material supply source (E): lanthana (La
2O
3) and the sintered body of porous matter tungsten.
Emitter-base bandgap grading material feed path (21): the length (L) of the 1st hole (21a): 2mm, the internal diameter (D) of the 1st hole (21a): 2mm, the length (1) of the 2nd hole (21b): 1.5mm, the internal diameter (d) of the 2nd hole (21b): 0.2mm.
The emitter-base bandgap grading material is supplied with and is suppressed parts (22): the porous sintered article of tungsten powder (average grain diameter 5 μ m, voidage 30%).
And, make the discharge lamp (1) of the following specification that this negative electrode (1) has.
Luminous tube (11): quartz glass system, the maximum outside diameter of illuminating part (12): 55.0mm, the wall thickness of illuminating part (12): 3.0mm, the internal volume of illuminating part (12): 47cm
3
Anode body (15A): tungsten system; The axial length of main part (152): 18.5mm; The diameter of main part (152): 15mm; The axial length of cone portion (151): 5mm, the diameter of the tabular surface of front end: 5mm, the outer surface in the cone portion (151) are with respect to the inclination angle of central shaft: 45 °.
The separating distance of negative electrode (14) and anode (15): 6.0mm.
Wire rod (17,18): tungsten system, total length: 120mm, external diameter: 4mm.
Rated current: 80A
Rated voltage: 25V
Xenon sealing load: 0.66MPa
(comparative example 1)
The emitter-base bandgap grading material is not set in the alternate embodiment 1 supplies with inhibition parts and emitter-base bandgap grading material feed path, lanthana (La
2O
3) with the mode same with thoriated tungsten, will be arranged on the negative electrode being doped to the reception room that is exposed to discharge face under the state of tungsten, identical in addition, produce discharge lamp (2).
(comparative example 2)
The emitter-base bandgap grading material is not set in the alternate embodiment 1 supplies with inhibition parts and emitter-base bandgap grading material feed path, lanthana (La
2O
3) with the mode same with thoriated tungsten; To be configured in cathode body (14A) inside being doped to the reception room (20) of accommodating under the state of tungsten, be provided with from the hole that this reception room extends to cathode portion (long: 1.5mm, internal diameter: 0.2mm); Identical in addition, produce discharge lamp (3).
After with 2kW power discharge lamp (1)～(3) being lit a lamp 2 hours, turned off the light 30 minutes, repeat this and light a lamp/turn off the light, carry out following assessment.The result is as shown in table 1.
(assessment 1: the melanism rate of luminous tube)
According to following formula (1), calculate the melanism rate η of luminous tube, assess according to following assessment benchmark.
Formula (1): η (%)=(transmitance of the luminous tube central portion of end of lifetime)/(transmitance of the luminous tube central portion at initial stage) * 100
-assessment benchmark-
More than the A:90%
More than the B:80%, less than 90%
C: less than 80%
(assessment 2: the backway of bright spot position)
Calculate the backway Δ d of bright spot position according to following formula (2), assess according to following assessment benchmark.
Formula (2): Δ d (mm)=(the bright spot position at initial stage)-(the bright spot position when end of lifetime or generation are not lit a lamp)
-assessment benchmark-
More than the A:0mm, less than 2mm
More than the B:2mm, less than 4mm
More than the C:4mm
Table 1
Claims (6)
1. a use for discharge lamp negative electrode is the negative electrode that discharge lamp has, it is characterized in that,
This negative electrode has cathode body and the emitter-base bandgap grading material supply source that is made up of refractory metal,
Be formed with in this cathode body inside: accommodate the reception room and the emitter-base bandgap grading material feed path of above-mentioned emitter-base bandgap grading material supply source through forming to the hole of the leading section extension of negative electrode from this reception room,
Be provided with the emitter-base bandgap grading material in the above-mentioned emitter-base bandgap grading material feed path and supply with the inhibition parts.
2. use for discharge lamp negative electrode according to claim 1 is characterized in that, above-mentioned emitter-base bandgap grading material supply inhibition parts are made up of the porous sintered article of refractory metal powder.
3. use for discharge lamp negative electrode according to claim 1 is characterized in that, it is the porous plastids that formed by a plurality of wire rods that refractory metal constitutes that above-mentioned emitter-base bandgap grading material is supplied with the inhibition parts.
4. according to any described use for discharge lamp negative electrode of claim 1～claim 3, it is characterized in that above-mentioned emitter-base bandgap grading material supply source contains at least a emitter-base bandgap grading material that is selected from rare earth based compound and barium based compound.
5. according to any described use for discharge lamp negative electrode of claim 1～claim 3; It is characterized in that above-mentioned emitter-base bandgap grading material supply source contains and is selected from lanthana, cerium oxide, praseodymium oxide, neodymia, samarium oxide, gadolinium oxide, barium-calcium-aluminate (Ba-Ca-Al-O), barium tungstate (Ba
3WO
6) and at least a emitter-base bandgap grading material of barium-strontium-calcium-tungstates (Ba-Sr-Ca-W-O).
6. according to any described electrode for discharge lamp of claim 1～claim 3, it is characterized in that above-mentioned emitter-base bandgap grading material supply source contains the emitter-base bandgap grading material of steam pressure greater than thorium oxide.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011-021380 | 2011-02-03 | ||
| JP2011021380 | 2011-02-03 | ||
| JP2011-169961 | 2011-08-03 | ||
| JP2011169961A JP5287951B2 (en) | 2011-02-03 | 2011-08-03 | Cathode for discharge lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102629546A true CN102629546A (en) | 2012-08-08 |
Family
ID=46547149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100236509A Pending CN102629546A (en) | 2011-02-03 | 2012-02-03 | Electric discharge lamp cathode |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP5287951B2 (en) |
| CN (1) | CN102629546A (en) |
| DE (1) | DE102012002048A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105340055A (en) * | 2013-06-25 | 2016-02-17 | 优志旺电机株式会社 | Discharge lamp |
| CN105359252A (en) * | 2013-10-02 | 2016-02-24 | 优志旺电机株式会社 | Short-arc discharge lamp and short-arc discharge lamp cathode production method |
| CN105788999A (en) * | 2016-03-28 | 2016-07-20 | 中国科学院电子学研究所 | Impregnated Ba5Sr(WO6)2 cathode and preparation method thereof |
| CN107785230A (en) * | 2017-11-02 | 2018-03-09 | 常州玉宇电光器件有限公司 | Height triggering property negative electrode and its manufacture craft |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6191865B2 (en) * | 2013-08-26 | 2017-09-06 | ウシオ電機株式会社 | Discharge lamp |
| AT16085U1 (en) * | 2017-09-22 | 2019-01-15 | Plansee Se | cathode |
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| JPH02295056A (en) * | 1989-05-09 | 1990-12-05 | Ushio Inc | Electrode for discharge lamp |
| JP2003187741A (en) * | 2001-12-19 | 2003-07-04 | Ushio Inc | Electrode for discharge lamp |
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| JPS639762U (en) | 1986-07-07 | 1988-01-22 | ||
| JPH06105588B2 (en) * | 1987-03-26 | 1994-12-21 | ウシオ電機株式会社 | Method for manufacturing cathode for discharge lamp |
| JP2851727B2 (en) * | 1991-08-23 | 1999-01-27 | ウシオ電機株式会社 | Electrode for discharge lamp |
| JPH08241663A (en) * | 1995-03-03 | 1996-09-17 | Mitsubishi Electric Corp | Thermoelectron emitting cathode and its manufacture |
| JP3174999B2 (en) * | 1995-08-03 | 2001-06-11 | キヤノン株式会社 | Electron emitting element, electron source, image forming apparatus using the same, and method of manufacturing the same |
| JP3175592B2 (en) * | 1996-05-17 | 2001-06-11 | ウシオ電機株式会社 | Discharge lamp electrode |
| JPH1196965A (en) | 1997-09-18 | 1999-04-09 | Ushio Inc | Short-arc type mercury lamp |
| JPH11154488A (en) * | 1997-09-20 | 1999-06-08 | New Japan Radio Co Ltd | Cathode for discharge tube and arc lamp |
| JPH11219682A (en) * | 1998-01-30 | 1999-08-10 | Ushio Inc | Cathode for discharge lamp |
| JP3470621B2 (en) * | 1998-11-17 | 2003-11-25 | ウシオ電機株式会社 | Cathode for discharge lamp |
| JP4436547B2 (en) * | 2000-07-31 | 2010-03-24 | 株式会社ユメックス | Cathode for discharge lamp, discharge lamp provided with the cathode, and method for producing the cathode |
| JP2006179226A (en) * | 2004-12-21 | 2006-07-06 | Ushio Inc | Discharge lamp |
| JP5404477B2 (en) * | 2010-03-10 | 2014-01-29 | 株式会社オーク製作所 | Discharge lamp |
-
2011
- 2011-08-03 JP JP2011169961A patent/JP5287951B2/en active Active
-
2012
- 2012-02-02 DE DE201210002048 patent/DE102012002048A1/en not_active Ceased
- 2012-02-03 CN CN2012100236509A patent/CN102629546A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02295056A (en) * | 1989-05-09 | 1990-12-05 | Ushio Inc | Electrode for discharge lamp |
| JP2003187741A (en) * | 2001-12-19 | 2003-07-04 | Ushio Inc | Electrode for discharge lamp |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105340055A (en) * | 2013-06-25 | 2016-02-17 | 优志旺电机株式会社 | Discharge lamp |
| TWI576893B (en) * | 2013-06-25 | 2017-04-01 | Ushio Electric Inc | Discharge lamp |
| CN105340055B (en) * | 2013-06-25 | 2017-07-11 | 优志旺电机株式会社 | Discharge lamp |
| CN105359252A (en) * | 2013-10-02 | 2016-02-24 | 优志旺电机株式会社 | Short-arc discharge lamp and short-arc discharge lamp cathode production method |
| CN105359252B (en) * | 2013-10-02 | 2017-11-10 | 优志旺电机株式会社 | The manufacture method of the negative electrode of short arc discharge lamp and short arc discharge lamp |
| CN105788999A (en) * | 2016-03-28 | 2016-07-20 | 中国科学院电子学研究所 | Impregnated Ba5Sr(WO6)2 cathode and preparation method thereof |
| CN107785230A (en) * | 2017-11-02 | 2018-03-09 | 常州玉宇电光器件有限公司 | Height triggering property negative electrode and its manufacture craft |
| CN107785230B (en) * | 2017-11-02 | 2024-06-04 | 常州玉宇电光器件有限公司 | High-trigger cathode and manufacturing process thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102012002048A1 (en) | 2012-08-09 |
| JP2012178329A (en) | 2012-09-13 |
| JP5287951B2 (en) | 2013-09-11 |
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