EP0762475B1 - Metal halide discharge lamp for projection purposes - Google Patents
Metal halide discharge lamp for projection purposes Download PDFInfo
- Publication number
- EP0762475B1 EP0762475B1 EP96112969A EP96112969A EP0762475B1 EP 0762475 B1 EP0762475 B1 EP 0762475B1 EP 96112969 A EP96112969 A EP 96112969A EP 96112969 A EP96112969 A EP 96112969A EP 0762475 B1 EP0762475 B1 EP 0762475B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- μmol
- discharge lamp
- metal halide
- metal
- halide discharge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910001507 metal halide Inorganic materials 0.000 title claims description 23
- 150000005309 metal halides Chemical class 0.000 title claims description 23
- 239000010955 niobium Substances 0.000 claims description 19
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 10
- 150000002910 rare earth metals Chemical class 0.000 claims description 10
- 229910052692 Dysprosium Inorganic materials 0.000 claims description 7
- KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 claims description 6
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims description 5
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 claims description 5
- 229910052794 bromium Inorganic materials 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 5
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 5
- 229910052753 mercury Inorganic materials 0.000 claims description 5
- 229910052758 niobium Inorganic materials 0.000 claims description 5
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 5
- 229910052689 Holmium Inorganic materials 0.000 claims description 4
- 229910052736 halogen Inorganic materials 0.000 claims description 4
- 150000002367 halogens Chemical class 0.000 claims description 4
- KJZYNXUDTRRSPN-UHFFFAOYSA-N holmium atom Chemical compound [Ho] KJZYNXUDTRRSPN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052792 caesium Inorganic materials 0.000 claims description 2
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 claims description 2
- 150000002366 halogen compounds Chemical class 0.000 claims description 2
- OCVXZQOKBHXGRU-UHFFFAOYSA-N iodine(1+) Chemical compound [I+] OCVXZQOKBHXGRU-UHFFFAOYSA-N 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims 4
- 239000002184 metal Substances 0.000 claims 4
- 239000004020 conductor Substances 0.000 claims 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims 1
- 229910052740 iodine Inorganic materials 0.000 claims 1
- 239000011630 iodine Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000009877 rendering Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 206010038743 Restlessness Diseases 0.000 description 1
- 229910052775 Thulium Inorganic materials 0.000 description 1
- 150000001649 bromium compounds Chemical class 0.000 description 1
- XQPRBTXUXXVTKB-UHFFFAOYSA-M caesium iodide Chemical compound [I-].[Cs+] XQPRBTXUXXVTKB-UHFFFAOYSA-M 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000001839 endoscopy Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
- H01J61/125—Selection of substances for gas fillings; Specified operating pressure or temperature having an halogenide as principal component
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
- H01J61/827—Metal halide arc lamps
Definitions
- the invention relates to a metal halide discharge lamp according to the The preamble of claim 1 and the preamble of claim 6.
- Metal halide discharge lamps of this type are mainly installed in optical reflectors or other optical imaging systems. Your area of application is, for example, projection or light guide technology for overhead, slide and cinema projection as well as especially for video projection or for endoscopy and boroscopy. Accordingly, very short arcs (typical arc lengths of at most a few mm) and maximum luminance (on average more than approx. 30 kcd / cm 2 ) at color temperatures of more than 4500 K and good color rendering are required for good imaging results. Typical power values are in the range between approx. 100 W and 600 W. In addition, the temporal constancy of the location of the discharge arc within the lamp vessel is of particular importance. When the arc is unstable, the discharge arc stochastically moves out of the focus of the lamp reflector and thus impairs the quality of the optical image.
- FR-A-2130255 discloses a metal halide high-pressure discharge lamp with a wall load between 10 and 100 W / cm 2 and a specific arc power between 100 and 1000 W / cm.
- the discharge vessel contains cesium iodide and bromides of rare earth metals, in particular of dysprosium (Dy), holmium (Ho) and thulium (Tm). Furthermore, the discharge vessel contains an excess of bromine which exceeds the stoichiometric ratio of the compounds bromine / rare earth metals.
- WO 94/23441 is a metal halide discharge lamp for specific Arc power between 60 and 140 W per mm arc length with a Filling reveals that besides mercury (Hg) and an inert gas additionally halogen compounds of the elements cesium (Cs), dysprosium (Dy) and tantalum (Ta) contains.
- Hg mercury
- Cs cesium
- Dy dysprosium
- Ta tantalum
- the invention has for its object to the disadvantage mentioned eliminate and create a metal halide discharge lamp that a Color temperature of more than 4500 K - with good color rendering - as well a slight unsteady bow even with very high specific bow outputs having.
- the task formulated at the beginning can be also solve with a filling that - in contrast to the cited state of the art Technology - no Cs as a filling component.
- Nb niobium
- the Nb acts directly in the Electrode area on the arch base. Without any commitment to intend theoretical explanation it is believed that the Nb forms a mixed phase with the electrode material, which leads to arc stability contributes.
- the filling of the discharge vessel of the metal halide discharge lamp according to the invention consists of the following filling components: Nb, a rare earth metal (SE), preferably Dy, Hg, an inert gas and one or more halogens, preferably iodine (I) and / or bromine (Br) to form metal halides.
- SE rare earth metal
- Hg a rare earth metal
- I iodine
- Br bromine
- Dy can also be wholly or partly by another element the rare earths with comparable properties in gas discharge be replaced, e.g. by holmium (Ho).
- Ho holmium
- the typical filling quantity per cm 3 volume of the discharge vessel is for the rare earth metal (SE), in particular also for Dy, in the range between 0.3 ⁇ mol and 3 ⁇ mol and for Nb in the range between 0.3 ⁇ mol and 3 ⁇ mol, preferably in the range between 1 ⁇ mol and 1.5 ⁇ mol.
- the filling pressure of the inert gas serving as the ignition gas for example argon (Ar) or xenon (Xe), is typically in the range between approximately 20 kPa and 60 kPa.
- the amount of mercury is used to set the desired lamp arc voltage. It is typically in the range between approx. 5 mg and 15 mg per mm arc length for burning voltages between 30 V and 50 V.
- the discharge vessel additionally contains up to approx. 3 ⁇ mol Cs per cm 3 vessel volume.
- the filling quantity of the C is preferably in the range between 0.5 ⁇ mol and 2.5 ⁇ mol per cm 3 of vessel volume.
- This filling system is particularly suitable for the highest requirements to the arc rest and life of the lamp as well as in particular specific power densities of approx. 200 W and more per mm arc length.
- the Cs addition gives you a further degree of freedom for the lamp design. This degree of freedom can be, for example, for one Optimization of the electrode geometry with a view to a longer service life use.
- the disadvantage is, however, that with increasing Cs content the light output decreases. In individual cases, one is for the concrete value of the Cs share therefore make a suitable compromise.
- the lamp is advantageously combined with a reflector to form a structural unit, as described in DE-PS 28 40 031.
- the lamp is approximate mounted axially in the reflector.
- the reflector is e.g. dichroic coated.
- Quartz glass or a transparent ceramic material, for example Al 2 O 3, is suitable as the material for the lamp bulb.
- a discharge vessel which is closed on both sides is particularly suitable for the lamp.
- Two electrodes face each other inside the discharge vessel.
- the electrodes are each connected to a power supply that is gas-tight are led outside.
- Typical values for the specific arc power are in the range between approximately 100 W and 200 W or more per mm arc length, in particular in the range between approximately 150 W and 200 W per mm arc length. Average luminance levels of typically more than 45 kcd / cm 2 are achieved.
- the longitudinal section is one firmly connected to a reflector Metal halide discharge lamp 1 with a power of 270 W schematically shown.
- the discharge vessel 2 made of quartz glass essentially has one spherical shape and points to two diametrically opposite Place one neck each in the pin-shaped tungsten electrodes 3 are melted by means of sealing foils 4 made of molybdenum.
- the the discharge space opposite ends of the sealing foils 4 are supplied with power 5 welded, which in turn with electrical connections 6, 7 of Reflector base system are connected.
- the reflector base system exists - Except for the electrical connections 6, 7- essentially the reflector 8 and a two-part ceramic base 9, 10.
- For a more detailed Explanation of the reflector base system is on the DE-PS 28 40 031.
- the internal volume of the discharge vessel 2 enclosing an ionizable filling is approximately 0.33 cm 3 .
- the axially opposed electrodes 3 are 1.6 mm apart.
- the filling in addition to 12 mg Hg and 45 kPa Ar as the base gas, the filling consists of the further filling constituents listed in Table 1 below in the amounts specified there.
- the volume-related molar amounts of some filling components calculated from this are listed in Table 2 below.
- the specific arc power and the operating voltage are approx. 167 W per mm arc length or approx. 35 V.
- Table 3 shows the lighting values of the lamp achieved with this filling. Quantities of the components of the first filling example of the lamp. Nb 0.04 mg Dy 0.08 mg Ed 12 mg HgBr 2 0.7 mg HgI 2 0.68 mg Ar 45 kPa Volume-related molar amounts of some filling components from Table 1.
- the filling in addition to 12 mg Hg and 45 kPa Ar as the base gas, the filling consists of the further filling components listed in Table 4 below in the amounts specified there.
- the volume-related molar amounts of some filling components calculated from this are listed in Table 5 below.
- the specific arc power and the operating voltage are approx. 167 W per mm arc length or approx. 35 V.
- Table 6 shows the lighting values of the lamp achieved with this filling. Amount of components of the second filling example of the lamp.
Landscapes
- Discharge Lamp (AREA)
Description
Die Erfindung betrifft eine Metallhalogenid-Entladungslampe gemäß dem
Oberbegriff des Anspruchs 1 bzw. dem Oberbegriff des Anspruchs 6.The invention relates to a metal halide discharge lamp according to the
The preamble of
Metallhalogenid-Entladungslampen dieser Art werden vorwiegend in optische Reflektoren oder sonstige optisch abbildende Systeme eingebaut. Ihr Einsatzgebiet ist beispielsweise die Projektions- oder Lichtleitertechnik u.a. für die Overhead-, Dia- und Kinoprojektion sowie besonders für die Videoprojektion bzw. für die Endoskopie und Boroskopie. Für gute Abbildungsergebnisse sind dementsprechend sehr kurze Lichtbögen (typische Bogenlängen von allenfalls wenigen mm) und höchste Leuchtdichten (im Mittel mehr als ca. 30 kcd/cm2) bei Farbtemperaturen von mehr als 4500 K und guter Farbwiedergabe erforderlich. Typische Leistungswerte liegen im Bereich zwischen ca. 100 W und 600 W. Außerdem kommt der zeitlichen Konstanz des Ortes des Entladungsbogens innerhalb des Lampengefäßes eine besondere Bedeutung zu. Bei Bogenunruhe wandert der Entladungsbogen nämlich stochastisch aus dem Fokus des Lampenreflektors und beeinträchtigt so die Qualität der optischen Abbildung.Metal halide discharge lamps of this type are mainly installed in optical reflectors or other optical imaging systems. Your area of application is, for example, projection or light guide technology for overhead, slide and cinema projection as well as especially for video projection or for endoscopy and boroscopy. Accordingly, very short arcs (typical arc lengths of at most a few mm) and maximum luminance (on average more than approx. 30 kcd / cm 2 ) at color temperatures of more than 4500 K and good color rendering are required for good imaging results. Typical power values are in the range between approx. 100 W and 600 W. In addition, the temporal constancy of the location of the discharge arc within the lamp vessel is of particular importance. When the arc is unstable, the discharge arc stochastically moves out of the focus of the lamp reflector and thus impairs the quality of the optical image.
Die FR-A-2130255 offenbart eine Metallhalogenid-Hochdruckentladungslampe mit einer Wandbelastung zwischen 10 und 100 W/cm2 sowie einer spezifischen Bogenleistung zwischen 100 und 1000 W/cm. Das Entladungsgefäß enthält Cäsiumjodid und Bromide von Seltenerdmetallen, insbesondere von Dysprosium (Dy), Holmium (Ho) und Thulium (Tm). Ferner enthält das Entladungsgefäß einen das stöchiometrische Verhältnis der Verbindungen Brom/Seltenerdmetalle übersteigenden Bromüberschuß.FR-A-2130255 discloses a metal halide high-pressure discharge lamp with a wall load between 10 and 100 W / cm 2 and a specific arc power between 100 and 1000 W / cm. The discharge vessel contains cesium iodide and bromides of rare earth metals, in particular of dysprosium (Dy), holmium (Ho) and thulium (Tm). Furthermore, the discharge vessel contains an excess of bromine which exceeds the stoichiometric ratio of the compounds bromine / rare earth metals.
In der US-A-4074166 ist eine im UV(Ultraviolett)-Bereich strahlende Mitteldruck-Bogenlampe offenbart. Diese Lampe enthält neben einem Startgas, z.B. Argon, überwiegend Quecksilber sowie einen kleinen Zusatz metallisches Niob. Das Niob trägt zur Stabilisierung sognannter Plasmaoszillationen bei, die bei Bogenlängen größer 900 mm (36 inch) auftreten und zu vorzeitigem Lampenausfall führen. In US-A-4074166 a radiating in the UV (U ltra v iolet) region medium pressure arc lamp is disclosed. In addition to a starting gas such as argon, this lamp mainly contains mercury and a small addition of metallic niobium. The niobium helps stabilize so-called plasma oscillations, which occur with arc lengths greater than 900 mm (36 inch) and lead to premature lamp failure.
In der WO 94/23441 ist eine Metallhalogenid-Entladungslampe für spezifische Bogenleistungen zwischen 60 und 140 W pro mm Bogenlänge mit einer Füllung offenbart, die neben Quecksilber (Hg) und einem Inertgas noch zusätzlich Halogenverbindungen der Elemente Cäsium (Cs), Dysprosium (Dy) und Tantal (Ta) enthält. Nachteilig ist, daß bei höheren als den angegebenen Bogenleistungen zunehmend Bogenunruhen auftreten.In WO 94/23441 is a metal halide discharge lamp for specific Arc power between 60 and 140 W per mm arc length with a Filling reveals that besides mercury (Hg) and an inert gas additionally halogen compounds of the elements cesium (Cs), dysprosium (Dy) and tantalum (Ta) contains. The disadvantage is that at higher than that specified arc performances increasingly occur bow unrest.
Der Erfindung liegt die Aufgabe zugrunde, den genannten Nachteil zu beseitigen und eine Metallhalogenid-Entladungslampe zu schaffen, die eine Farbtemperatur von mehr als 4500 K - bei guter Farbwiedergabe - sowie eine auch bei sehr hohen spezifischen Bogenleistungen geringe Bogenunruhe aufweist. The invention has for its object to the disadvantage mentioned eliminate and create a metal halide discharge lamp that a Color temperature of more than 4500 K - with good color rendering - as well a slight unsteady bow even with very high specific bow outputs having.
Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale
des Anspruchs 1 gelöst. Weitere vorteilhafte Merkmale der Erfindung
sind in den darauf gerichteten Unteransprüchen erläutert.This object is achieved by the characterizing features
of
Eine weitere erfindungsgemäß Lösung dieser Aufgabe ist durch die Merkmale
des Anspruchs 6 gekennzeichnet. Weitere vorteilhafte Merkmale dieser
Lösung sind in den darauf gerichteten Unteransprüchen erläutert.A further solution to this object according to the invention is by the features
of
Wie Messungen gezeigt haben, läßt sich die eingangs formulierte Aufgabe auch mit einer Füllung lösen, die - im Unterschied zum zitierten Stand der Technik- auf Cs als Füllungskomponente verzichtet. Als überraschendes Ergebnis der Messungen ist durch den Zusatz von Niob (Nb) anstelle von Ta die Bogenunruhe - auch ohne Cs - selbst bei spezifischen Bogenleistungen von bis zu 200 W pro mm Bogenlänge noch gering. Durch den Verzicht auf Cs wird eine höhere Lichtausbeute erzielt.As measurements have shown, the task formulated at the beginning can be also solve with a filling that - in contrast to the cited state of the art Technology - no Cs as a filling component. As a surprise The result of the measurements is the addition of niobium (Nb) instead of Ta the uneven bow - even without Cs - even with specific bow performances of up to 200 W per mm arc length is still low. By doing without Cs a higher luminous efficacy is achieved.
Nach gegenwärtigem Stand der Erkenntnis wirkt das Nb unmittelbar im Elektrodenbereich auf den Bogenansatz. Ohne eine Festlegung auf irgendeine theoretische Erklärung zu beabsichtigen wird davon ausgegangen, daß das Nb mit dem Elektrodenmaterial eine Mischphase bildet, welche zur Bogenstabilität beiträgt.According to the current state of knowledge, the Nb acts directly in the Electrode area on the arch base. Without any commitment To intend theoretical explanation it is believed that the Nb forms a mixed phase with the electrode material, which leads to arc stability contributes.
Die Füllung des Entladungsgefäßes der erfindungsgemäßen Metallhalogenid-Entladungslampe besteht gemäß der ersten Lösung aus folgenden Füllungskomponenten: Nb, einem Seltenen Erdmetall (SE), bevorzugt Dy, Hg, einem Inertgas und einem oder mehreren Halogenen, vorzugsweise Jod (I) und/oder Brom (Br) zur Bildung von Metallhalogeniden.The filling of the discharge vessel of the metal halide discharge lamp according to the invention According to the first solution, it consists of the following filling components: Nb, a rare earth metal (SE), preferably Dy, Hg, an inert gas and one or more halogens, preferably iodine (I) and / or bromine (Br) to form metal halides.
Selbstverständlich kann Dy auch ganz oder teilweise durch ein anderes Element der Seltenen Erden mit vergleichbaren Eigenschaften in der Gasentladung ersetzt werden, z.B. durch Holmium (Ho).Of course, Dy can also be wholly or partly by another element the rare earths with comparable properties in gas discharge be replaced, e.g. by holmium (Ho).
Die typische Füllmenge pro cm3 Volumen des Entladungsgefäßes liegt für das Seltene Erdmetall (SE), insbesondere auch für Dy, im Bereich zwischen 0,3 µmol und 3 µmol sowie für Nb im Bereich zwischen 0,3 µmol und 3 µmol, bevorzugt im Bereich zwischen 1 µmol und 1,5 µmol. Der Fülldruck des als Zündgas dienenden Inertgases, beispielsweise Argon (Ar) oder Xenon (Xe), liegt typisch im Bereich zwischen ca. 20 kPa und 60 kPa. Die Füllmenge des Quecksilbers dient zur Einstellung der gewünschten Brennspannung der Lampe. Sie liegt typisch im Bereich zwischen ca. 5 mg und 15 mg pro mm Bogenlänge für Brennspannungen zwischen 30 V und 50 V.The typical filling quantity per cm 3 volume of the discharge vessel is for the rare earth metal (SE), in particular also for Dy, in the range between 0.3 µmol and 3 µmol and for Nb in the range between 0.3 µmol and 3 µmol, preferably in the range between 1 µmol and 1.5 µmol. The filling pressure of the inert gas serving as the ignition gas, for example argon (Ar) or xenon (Xe), is typically in the range between approximately 20 kPa and 60 kPa. The amount of mercury is used to set the desired lamp arc voltage. It is typically in the range between approx. 5 mg and 15 mg per mm arc length for burning voltages between 30 V and 50 V.
In einer zweiten Lösung enthält das Entladungsgefäß zusätzlich bis zu ca. 3 µmol Cs pro cm3 Gefäßvolumen. Bevorzugt liegt die Füllmenge des Cs im Bereich zwischen 0,5 µmol und 2,5 µmol pro cm3 Gefäßvolumen.In a second solution, the discharge vessel additionally contains up to approx. 3 µmol Cs per cm 3 vessel volume. The filling quantity of the C is preferably in the range between 0.5 μmol and 2.5 μmol per cm 3 of vessel volume.
Dieses Füllungssystem eignet sich insbesondere für höchste Anforderungen an die Bogenruhe und Lebensdauer der Lampe sowie insbesondere auch bei spezifischen Leistungsdichten von ca. 200 W und mehr pro mm Bogenlänge. Durch den Cs Zusatz gewinnt man nämlich einen weiteren Freiheitsgrad für das Lampendesign. Dieser Freiheitsgrad läßt sich beispielsweise für eine Optimierung der Elektrodengeometrie in Hinblick auf eine höhere Lebensdauer nutzen. Der Nachteil ist allerdings, daß mit zunehmendem Cs Anteil die Lichtausbeute abnimmt. Im Einzelfall wird man für den konkreten Wert des Cs Anteils also einen geeigneten Kompromiß eingehen.This filling system is particularly suitable for the highest requirements to the arc rest and life of the lamp as well as in particular specific power densities of approx. 200 W and more per mm arc length. The Cs addition gives you a further degree of freedom for the lamp design. This degree of freedom can be, for example, for one Optimization of the electrode geometry with a view to a longer service life use. The disadvantage is, however, that with increasing Cs content the light output decreases. In individual cases, one is for the concrete value of the Cs share therefore make a suitable compromise.
Vorteilhaft wird die Lampe mit einem Reflektor zu einer Baueinheit zusammengefügt, wie in der DE-PS 28 40 031 beschrieben. Dabei ist die Lampe näherungsweise axial im Reflektor montiert. Der Reflektor ist z.B. dichroitisch beschichtet.The lamp is advantageously combined with a reflector to form a structural unit, as described in DE-PS 28 40 031. The lamp is approximate mounted axially in the reflector. The reflector is e.g. dichroic coated.
Als Material für den Lampenkolben eignet sich Quarzglas oder auch ein transparentes Keramikmaterial, beispielsweise Al2O3. Für die Lampe eignet sich insbesondere ein zweiseitig verschlossenes Entladungsgefäß.Quartz glass or a transparent ceramic material, for example Al 2 O 3, is suitable as the material for the lamp bulb. A discharge vessel which is closed on both sides is particularly suitable for the lamp.
Innerhalb des Entladungsgefäßes stehen sich zwei Elektroden gegenüber. Die Elektroden sind jeweils mit einer Stromzuführung verbunden, die gasdicht nach außen geführt sind.Two electrodes face each other inside the discharge vessel. The electrodes are each connected to a power supply that is gas-tight are led outside.
Typische Werte für die spezifische Bogenleistung liegen im Bereich zwischen ca. 100 W und 200 W oder mehr pro mm Bogenlänge, insbesondere im Bereich zwischen ca. 150 W und 200 W pro mm Bogenlänge. Dabei werden mittlere Leuchtdichten von typisch mehr als 45 kcd/cm2 erzielt.Typical values for the specific arc power are in the range between approximately 100 W and 200 W or more per mm arc length, in particular in the range between approximately 150 W and 200 W per mm arc length. Average luminance levels of typically more than 45 kcd / cm 2 are achieved.
Die Erfindung wird im folgenden anhand zweier Füllungsbeispiele näher erläutert. Es zeigt die
- Figur
- eine schematische geschnittene Darstellung der Lampe mit Reflektor.
- Figure
- a schematic sectional view of the lamp with reflector.
In der Figur ist der Längsschnitt einer mit einem Reflektor fest verbundenen
Metallhalogenid-Entladungslampe 1 mit einer Leistung von 270 W schematisch
dargestellt. Das Entladungsgefäß 2 aus Quarzglas besitzt eine im wesentlichen
kugelförmige Gestalt und weist an zwei diametral gegenüberliegenden
Stellen je einen Hals auf, in den stiftförmige Wolfram-Elektroden 3
mittels Dichtungsfolien 4 aus Molybdän eingeschmolzen sind. Die dem Entladungsraum
abgewandten Enden der Dichtungsfolien 4 sind mit Stromzuführungen
5 verschweißt, die ihrerseits mit elektrischen Anschlüssen 6, 7 des
Reflektor-Sockelsystems verbunden sind. Das Reflektor-Sockelsystems besteht
- außer aus den elektrischen Anschlüssen 6, 7- im wesentlichen aus
dem Reflektor 8 und einem zweiteiligen Keramiksockel 9, 10. Für eine detailliertere
Erläuterung des Reflektor-Sockelsystem sei auf die DE-PS
28 40 031 verwiesen.In the figure, the longitudinal section is one firmly connected to a reflector
Metal
Das innere Volumen des eine ionisierbare Füllung umschließenden Entladungsgefäßes
2 beträgt ca. 0,33 cm3. Die axial einander gegenüberstehenden
Elektroden 3 haben einen Abstand von 1,6 mm.The internal volume of the
In einem ersten Beispiel besteht die Füllung neben 12 mg Hg und 45 kPa Ar
als Grundgas aus den in der folgenden Tabelle 1 aufgeführten weiteren
Füllungsbestandteilen in den dort angegebenen Mengen. Die daraus errechneten
volumenbezogenen molaren Mengen einiger Füllungskomponenten
sind in der nachfolgenden Tabelle 2 aufgelistet. Die spezifische Bogenleistung
und die Brennspannung betragen ca. 167 W pro mm Bogenlänge bzw.
ca. 35 V. Tabelle 3 zeigt die mit dieser Füllung erzielten lichttechnischen
Werte der Lampe.
In einem zweiten Beispiel besteht die Füllung neben 12 mg Hg und 45 kPa
Ar als Grundgas aus den in der folgenden Tabelle 4 aufgeführten weiteren
Füllungsbestandteilen in den dort angegebenen Mengen. Die daraus errechneten
volumenbezogenen molaren Mengen einiger Füllungskomponenten
sind in der nachfolgenden Tabelle 5 aufgelistet. Die spezifische Bogenleistung
und die Brennspannung betragen ca. 167 W pro mm Bogenlänge bzw.
ca. 35 V. Tabelle 6 zeigt die mit dieser Füllung erzielten lichttechnischen
Werte der Lampe.
Claims (12)
- Metal halide discharge lamp (1) for projection purposes, having a light-transmitting discharge vessel (2) in which two electrodes (3) are positioned opposite one another, which electrodes are connected to supply conductors (5) which are guided to the outside, the discharge vessel (2) containing an ionizable fill, comprising mercury, at least one inert gas, at least one halogen, a rare-earth metal (SE), or optionally two rare-earth metals, and a further metal for forming metal halides, characterized in that the fill contains niobium (Nb) as the further metal.
- Metal halide discharge lamp according to Claim 1, characterized in that the amount of Nb lies in the range between 0.3 µmol and 3 µmol per cm3 of the vessel volume.
- Metal halide discharge lamp according to Claim 2, characterized in that the amount of Nb preferably lies in the range between 1.0 µmol and 1.5 µmol per cm3 of the vessel volume.
- Metal halide discharge lamp according to Claim 1, characterized in that the fill contains dysprosium (Dy) as rare-earth metal, the amount of Dy lying in range between 0.3 µmol and 3 µmol per cm3 of the vessel volume.
- Metal halide discharge lamp according to Claim 4, characterized in that some or all of the dysprosium is replaced by holmium.
- Metal halide discharge lamp according to Claim 1, characterized in that the discharge vessel contains, as halogens for the halogen compounds, iodine (I) and bromine (Br), in an iodine to bromine molar ratio in the range between 0.2 and 2.
- Metal halide discharge lamp (1) for projection purposes, having a light-transmitting discharge vessel (2) in which two electrodes (3) are positioned opposite one another, which electrodes are connected to supply conductors (5) which are guided to the outside, the discharge vessel (2) containing an ionizable fill, comprising mercury (Hg), at least one inert gas, at least one halogen, caesium (Cs) and a rare-earth metal (SE), or optionally two rare-earth metals, and a further metal for forming metal halides, characterized in that the fill contains niobium (Nb) as the further metal.
- Metal halide discharge lamp according to Claim 7, characterized in that the amount of Nb lies in the range between 0.3 µmol and 3 µmol per cm3 of the vessel volume.
- Metal halide discharge lamp according to Claim 7, characterized in that the amount of Cs per cm3 of the vessel volume lies within the following range: 0 µmol < Cs ≤ 3 µmol.
- Metal halide discharge lamp according to Claim 9, characterized in that the amount of Cs per cm3 of the vessel volume preferably lies within the following range: 0.5 µmol ≤ Cs ≤ 2.5 µmol.
- Metal halide discharge lamp according to Claim 7, characterized in that the fill contains dysprosium (Dy) as rare-earth metal, the amount of Dy lying in range between 0.3 µmol and 3 µmol per cm3 of the vessel volume.
- Metal halide discharge lamp according to Claim 11, characterized in that some or all of the dysprosium is replaced by holmium.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19530821 | 1995-08-23 | ||
| DE19530821A DE19530821A1 (en) | 1995-08-23 | 1995-08-23 | Metal halide arc discharge lamp for projection purposes |
| DE19548518 | 1995-12-22 | ||
| DE19548518A DE19548518A1 (en) | 1995-08-23 | 1995-12-22 | Metal halide discharge lamp for projection purposes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0762475A1 EP0762475A1 (en) | 1997-03-12 |
| EP0762475B1 true EP0762475B1 (en) | 1999-11-03 |
Family
ID=26017893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96112969A Expired - Lifetime EP0762475B1 (en) | 1995-08-23 | 1996-08-12 | Metal halide discharge lamp for projection purposes |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5831388A (en) |
| EP (1) | EP0762475B1 (en) |
| JP (1) | JP3993656B2 (en) |
| CA (1) | CA2182423C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3200575B2 (en) * | 1997-09-01 | 2001-08-20 | フェニックス電機株式会社 | Metal halide lamp |
| JP3216877B2 (en) * | 1997-11-18 | 2001-10-09 | 松下電子工業株式会社 | High pressure discharge lamp, illumination optical device using this high pressure discharge lamp as light source, and image display device using this illumination optical device |
| US6368175B1 (en) * | 1998-03-16 | 2002-04-09 | Matsushita Electric Industrial Co., Ltd. | Discharge lamp and method of producing the same |
| US6888312B2 (en) * | 2002-12-13 | 2005-05-03 | Welch Allyn, Inc. | Metal halide lamp for curing adhesives |
| WO2006088128A1 (en) * | 2005-02-17 | 2006-08-24 | Gs Yuasa Corporation | Ceramic metal halide lamp having rated lamp power of 450w or above |
| WO2008038245A2 (en) * | 2006-09-29 | 2008-04-03 | Koninklijke Philips Electronics, N.V. | Ceramic metal halide daylight lamp |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2114805A1 (en) * | 1971-03-26 | 1972-10-05 | Patra Patent Treuhand | High pressure discharge lamp |
| DE2114804B2 (en) * | 1971-03-26 | 1978-09-14 | Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh, 8000 Muenchen | Mercury vapor high pressure discharge lamp with the addition of rare earth halides |
| US3748520A (en) * | 1972-05-05 | 1973-07-24 | Gen Telephone & Elect | Electric discharge lamp having a fill including niobium pentaiodide complexed with an inorganic oxo-compound as the primary active component |
| US4074166A (en) * | 1976-11-19 | 1978-02-14 | Gte Sylvania Incorporated | Ultraviolet emitting arc discharge lamp |
| DE2840031A1 (en) * | 1978-09-14 | 1980-04-03 | Patra Patent Treuhand | ARRANGEMENT WITH HIGH PRESSURE DISCHARGE LAMP AND REFLECTOR AS A BUILDING UNIT |
| NL8005456A (en) * | 1980-10-02 | 1982-05-03 | Philips Nv | HIGH PRESSURE MERCURY DISCHARGE LAMP. |
| DE3427280C2 (en) * | 1984-07-24 | 1986-06-12 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 8000 München | Metal halide high pressure discharge lamp |
| US4672267A (en) * | 1986-04-04 | 1987-06-09 | Gte Laboratories Incorporated | High intensity discharge device containing oxytrihalides |
| JP2650463B2 (en) * | 1989-05-31 | 1997-09-03 | 岩崎電気株式会社 | Metal halide lamp |
| DE4030202A1 (en) * | 1990-09-24 | 1992-03-26 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | METAL HALOGENIDE HIGH PRESSURE DISCHARGE LAMP |
| DE4310539A1 (en) * | 1993-03-31 | 1994-10-06 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Metal halide high-pressure discharge lamp for installation in optical systems |
-
1996
- 1996-07-22 US US08/681,046 patent/US5831388A/en not_active Expired - Lifetime
- 1996-07-31 CA CA002182423A patent/CA2182423C/en not_active Expired - Fee Related
- 1996-08-12 EP EP96112969A patent/EP0762475B1/en not_active Expired - Lifetime
- 1996-08-14 JP JP23251496A patent/JP3993656B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3993656B2 (en) | 2007-10-17 |
| CA2182423C (en) | 2006-12-12 |
| JPH0963538A (en) | 1997-03-07 |
| US5831388A (en) | 1998-11-03 |
| EP0762475A1 (en) | 1997-03-12 |
| CA2182423A1 (en) | 1997-02-24 |
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