EP0869538B1 - Lampe à arc court à courant continu - Google Patents

Lampe à arc court à courant continu Download PDF

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Publication number
EP0869538B1
EP0869538B1 EP98104178A EP98104178A EP0869538B1 EP 0869538 B1 EP0869538 B1 EP 0869538B1 EP 98104178 A EP98104178 A EP 98104178A EP 98104178 A EP98104178 A EP 98104178A EP 0869538 B1 EP0869538 B1 EP 0869538B1
Authority
EP
European Patent Office
Prior art keywords
lamp
lamp according
bulb
anode
longitudinal section
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
Application number
EP98104178A
Other languages
German (de)
English (en)
Other versions
EP0869538A1 (fr
Inventor
Andreas Dr. Genz
Frank Werner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP0869538A1 publication Critical patent/EP0869538A1/fr
Application granted granted Critical
Publication of EP0869538B1 publication Critical patent/EP0869538B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/32—Special longitudinal shape, e.g. for advertising purposes
    • 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

Definitions

  • the present invention relates to a DC short arc lamp.
  • arc lamps In recently there has been an increasing interest in improving such arc lamps, especially for projection applications.
  • projection applications are above all the locally concentrated light generation on the one hand and on the other the spectral homogeneity of the luminous intensity distribution of the lamps of interest.
  • Another essential quality criterion - not only in the area of projection - are sufficient proportions of the primary colors blue, green and red for good color rendering and the desired color temperature.
  • the invention is based on the technical problem of a DC short arc lamp with improved operating properties, especially with regard to projection applications, and to provide an improved projection device.
  • this problem is solved by a DC short arc lamp with a plane perpendicular to a lamp longitudinal axis asymmetrically shaped pistons that the inner wall of the piston around the anode is wider than around the cathode, in which the piston around and around the anode Cathode is curved around, the anode-side longitudinal section radius of curvature 50% to 80% of the radius of curvature on the cathode side is, or by a projection device with such Projection lamp.
  • the anode is a very large number in DC short-arc lamps exposed to greater thermal stress than the cathode and becomes accordingly hotter.
  • the anode is so that it can withstand this thermal load DC short arc lamps are generally much more solid than that Cathode. In particular, it generally has a larger diameter.
  • the temperature homogeneity of the lamp is improved by that the inside wall of the piston is wider around the anode than around the cathode. This can, depending on the selected shape of the electrodes and depending on the manufacturing technology Aspects, with different concrete geometric shapes can be achieved, with geometrically simple and therefore easy to manufacture piston shapes are preferred.
  • Shapes are provided which are in longitudinal section through radii of curvature
  • the anode-side and the cathode-side end of the piston through a longitudinal section radius of curvature (as illustrated in the embodiment in the figure) describe, according to the invention the anode-side longitudinal section radius of curvature is smaller than the cathode side, namely 50% to 80% of the the latter is. This means that the piston bends more on the anode side or runs less flat. Another piston shape is achieved on the anode side.
  • the longitudinal centers of curvature of the curvature above and do not have to coincide below the lamp longitudinal axis and and on the cathode side can be different, because otherwise the smaller Radius of curvature would result in a narrower piston shape.
  • the arc length stands on the one hand in connection with the lamp power.
  • the invention particularly preferred are short-arc lamps with specific arc length Outputs of more than 80, 100, 120 or best 150 W / mm.
  • a reference on the piston size makes little sense, because the piston size due to the thermal Resilience of the piston material is determined and consequently in future material improvements (Ceramic instead of quartz glass) can decrease significantly.
  • Quantitatively preferred ranges for the asymmetry of the piston shapes can be describe by the ratio of anode-side to cathode-side longitudinal section half-area. As shown in the example, these are surfaces meant that in longitudinal section on both sides of one dividing the inner length of the piston in the middle and lie on the plane perpendicular to the lamp longitudinal axis, the lamp longitudinal axis each contain half of the inside length of the piston and the rest of the inside wall of the piston are limited. This ratio is preferably over 1.1 and further preferably less than 1.5.
  • the intention pursued according to the invention to reduce temperature gradients in the lamp can in principle also by a suitable reflective and / or absorbent Heat build-up on the cathode end of the piston can be tracked.
  • the measure also comes in addition to the piston asymmetry according to the invention in question.
  • it is preferred to apply such a heat accumulation to do without entirely because this means that the lamp is manufactured by at least one working step is simplified.
  • the piston asymmetry can namely by suitable Forming the corresponding molds in a lamp bulb molding machine achieve without the conventional function otherwise would be changed. Another advantage is that shadowing is avoided.
  • the lamp longitudinal axis preferably runs horizontally during operation, ie it is the lamp designed for horizontal operation.
  • the DC short-arc lamp according to the invention since the DC short-arc lamp according to the invention above all has advantages that show up when projecting images is a projection device according to the invention characterized in that it has a projection lamp according to the invention contains.
  • the entire projection device shows because of the improved light quality thus a better optical quality, and also with regard to the explained Luminous flux, service life and maintenance aspects also advantages in terms of Energy consumption and lamp replacement frequency. Therefore, also for the projection device generally claimed protection.
  • red color rendering preferably between 5,000 and 8,000 Kelvin, preferably 6,000 and 7,000 Kelvin.
  • the proportion of red in the light generated can be due to lithium in the filling of the invention DC short arc lamp are amplified.
  • Lithium predominantly shows a very long-wave emission, i.e. to a very deep red Share leads.
  • the physiological sensitivity of the human eye associated with the so-called V ( ⁇ ) - or brightness sensitivity curve is shown.
  • the spectral Sensitivity of the human eye is clearly evident on the long-wave edge from. Therefore, as far as the red component is based on the lithium emission, a accordingly increased spectral power can be generated to achieve the desired - and ultimately interesting - to generate luminous flux.
  • a metal halide direct current arc lamp is necessarily alongside an ignition gas, e.g. Argon, and a halogen, e.g. Bromine or iodine, too It must contain mercury to build up the necessary burning voltage green color of mercury. That through the mercury content The specified green component must be red when setting the color temperature be compensated, which exacerbates the problem outlined above.
  • an ignition gas e.g. Argon
  • a halogen e.g. Bromine or iodine
  • cadmium (Cd) or zinc (Zn) is used in the lamp filling according to the invention surprisingly, this not only increases the red component, but also reduces the color separation effect at the same time.
  • cadmium or zinc allows compared to (sole) lithium addition for the red portion a significant improvement in the color separation problem and, at same performance, an improved luminous flux.
  • Zinc also has the advantage of the better over cadmium and mercury Environmental compatibility.
  • Cadmium on the other hand, can be used for certain applications be advantageous because the red rendering is even better. So remains according to the invention in individual cases the possibility to choose between optimal lamp data and Environmental considerations.
  • the following preferred concentrations come in particular for Cd and Zn considered: 0.2 to 2.0 ⁇ mol / ml, particularly preferably 0.3 to 1.8 .mu.mol / ml.
  • the component shows yttrium together with the explained basic composition according to the invention Benefits.
  • the first is an improvement in the luminous flux.
  • the lamps have a longer lifespan and thirdly less decrease in lamp luminous flux with the operating age of the lamp (so-called maintenance).
  • Yttrium is therefore used to achieve the above basic effects of the invention are not necessary, but have been found to be related on luminous flux, service life and maintenance surprisingly more effective optional Addition highlighted.
  • a “blue element” preferred according to the invention is indium.
  • rare earth metals especially dysprosium, as well as thallium.
  • halogen for the setting of desired vapor pressures through the formation of metal halide compounds iodine and / or bromine are preferred.
  • the figure shows in longitudinal section a direct current arc lamp with a longitudinal axis 2, along which an anode 4 and a cathode 5 lie.
  • a piston inner wall 3 that is bisecting an inner bulb length 7 is also one on the lamp longitudinal axis 2 perpendicular center plane 1 is drawn.
  • the anode-side longitudinal section half surface differs specifically and the cathode-side longitudinal section half surface, each of which in the Figure left or right of the central plane lying longitudinal section area within the piston inner wall 3 corresponds.
  • the figure shows that the anode-side curvature of the piston in longitudinal section Descriptive radius of curvature 8 significantly smaller than the corresponding one Radius of curvature 9 on the cathode side.
  • the radius of curvature is preferably 8 50% - 80% of the radius of curvature 9. It can also be seen that the corresponding Longitudinal intersection centers above and below the lamp longitudinal axis 2 do not collapse and are different on the anode side and cathode side. However, the lamp is rotationally symmetrical about the lamp longitudinal axis 2.
  • the corresponding asymmetrical piston design has the consequence that the piston around the anode 4, which is much thicker than the cathode 5, is sufficient Keeps a distance and thus a uniform temperature distribution overall results in the longitudinal direction.
  • the figure shows that the distance between the anode 4 and the cathode 5, that is to say the arc length 6, is selected to be very short, in the present case 1.5 mm in comparison to radii of curvature of 4 mm (8) and 6 mm (9) and a lamp power of 270 W (specific power 180 W / mm).
  • the inside length of the piston 7 is almost 10 times the length of the arc 6.
  • An operating voltage of 35 V with a luminous flux of 18 klm results from a filling volume of 0.7 ml with a wall load of 65 W / cm 2 .
  • a color temperature of 6,800 K was set with the following filling: 200 mbar argon, 20 mg mercury, 0.11 mg cadmium iodide (CdI 2 ) - corresponding to approx.0.43 ⁇ mol Cd per ml flask volume -, 0.42 mg mercury bromide (HgBr 2 ), 0.12 mg mercury iodide (HgI 2 ), 0.05 mg indium iodide (InI 2 ), 0.05 mg lithium iodide (LiL 2 ), 0.11 mg dysprosium and 0.05 mg yttrium.
  • Cadmium can be replaced by zinc in a molar equivalent.
  • Thallium iodide can be added up to a value of 0.2 mg / ml.

Claims (14)

  1. Lampe à arc court à courant continu comportant une ampoule d'une forme dissymétrique telle par rapport à des plans (1) perpendiculairement à un axe (2) longitudinal de la lampe que la paroi (3) intérieure de l'ampoule est plus large autour de l'anode (4) qu'autour de l'anode (5) et que l'ampoule est incurvée autour de l'anode (4) et autour de l'anode (5), caractérisée en ce que le rayon (8) de courbure en coupe longitudinale côté anode est égal à 50 % à 80 % du rayon (9) de courbure en coupe longitudinale côté cathode.
  2. Lampe suivant la revendication 1, dans laquelle une puissance spécifique rapportée à la longueur (6) d'arc est supérieure à 80 W/mm.
  3. Lampe suivant la revendication 1 ou 2, dans laquelle le rapport entre une demi-surface en coupe longitudinale côté anode et une demi-surface en coupe longitudinale côté cathode est supérieur à 1,1, les demi-surfaces en coupe longitudinale se trouvant dans la coupe longitudinale de la lampe de part et d'autre d'un plan divisant en son milieu la longueur intérieur d'une ampoule de la lampe et perpendiculaire sur l'axe (2) longitudinal de la lampe et contenant l'axe (2) longitudinal de la lampe respectivement pour une moitié de la longueur intérieure de l'ampoule et étant délimité par ailleurs par la paroi (3) intérieure de l'ampoule.
  4. Lampe suivant la revendication 3, dans laquelle le rapport est inférieur à 1,5.
  5. Lampe suivant l'une des revendications précédentes comportant une ampoule sans revêtement d'accumulation de la chaleur.
  6. Lampe suivant l'une des revendications précédentes comportant une atmosphère constituée d'au moins les constituants suivants : de l'argon comme gaz d'amorçage, du mercure et un halogène, caractérisée par les constituants supplémentaires : cadmium et/ou zinc.
  7. Lampe suivant la revendication 6 comportant le constituant d'atmosphère yttrium.
  8. Lampe suivant la revendication 6 ou 7 comportant le constituant d'atmosphère lithium.
  9. Lampe suivant l'une des revendications 6 à 8 comportant le constituant d'atmosphère indium.
  10. Lampe suivant l'une des revendication 6 à 9 comportant un métal des terres rares, notamment du dysprosium comme constituant d'atmosphère.
  11. Lampe suivant l'une des revendications 6 à 10 comportant le constituant d'atmosphère thallium.
  12. Lampe suivant l'une des revendications 6 à 11 dans laquelle l'halogène est présent sous la forme d'iode et/ou de brome.
  13. Utilisation d'une lampe suivant l'une des revendications précédentes comportant un axe (2) longitudinal de lampe s'étendant horizontalement.
  14. Dispositif de projection comportant une lampe suivant les revendications 1 à 12 comme lampe de projection.
EP98104178A 1997-04-04 1998-03-09 Lampe à arc court à courant continu Expired - Lifetime EP0869538B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19714008 1997-04-04
DE19714008A DE19714008A1 (de) 1997-04-04 1997-04-04 Gleichstrombogenlampe

Publications (2)

Publication Number Publication Date
EP0869538A1 EP0869538A1 (fr) 1998-10-07
EP0869538B1 true EP0869538B1 (fr) 2002-11-06

Family

ID=7825484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98104178A Expired - Lifetime EP0869538B1 (fr) 1997-04-04 1998-03-09 Lampe à arc court à courant continu

Country Status (4)

Country Link
US (1) US6054811A (fr)
EP (1) EP0869538B1 (fr)
JP (1) JPH10283998A (fr)
DE (2) DE19714008A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004055858A2 (fr) * 2002-12-13 2004-07-01 Koninklijke Philips Electronics N.V. Lampe a decharge a pression elevee
EP1618594B1 (fr) * 2003-04-16 2010-08-25 Philips Intellectual Property & Standards GmbH Lampe a decharge a haute pression a halogenure de metal
JP4400136B2 (ja) * 2003-08-05 2010-01-20 ウシオ電機株式会社 ショートアーク型水銀蒸気放電ランプ
US20060175973A1 (en) * 2005-02-07 2006-08-10 Lisitsyn Igor V Xenon lamp
JP4853948B2 (ja) * 2006-03-14 2012-01-11 株式会社小糸製作所 自動車灯具用直流高圧放電バルブ
DE102006032450B4 (de) * 2006-07-13 2017-11-09 Osram Gmbh Hochdruckentladungslampe mit spezieller Dimensionierung von Halsbereichen des Entladungsgefäßes
WO2008038382A1 (fr) * 2006-09-28 2008-04-03 Phoenix Electric Co., Ltd. Système de projection d'image au moyen d'une lampe à décharge haute tension de type courant continu
JP5521522B2 (ja) * 2009-12-04 2014-06-18 ウシオ電機株式会社 キセノン水銀放電ランプおよび光照射装置

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JP2775694B2 (ja) * 1993-05-07 1998-07-16 ウシオ電機株式会社 放電ランプ
DE69402641T2 (de) * 1993-08-03 1997-08-21 Ushio Electric Inc Cadmiumentladungslampe
JP2970993B2 (ja) * 1994-04-20 1999-11-02 ウシオ電機株式会社 ショートアークメタルハライドランプ
DE69527491T2 (de) * 1994-11-25 2003-02-20 Ushiodenki Kabushiki Kaisha To Metallhalogenidlampe vom Kurz-Bogen Typ
JP3077538B2 (ja) * 1994-11-29 2000-08-14 ウシオ電機株式会社 ショートアーク型水銀ランプ

Also Published As

Publication number Publication date
DE19714008A1 (de) 1998-10-08
DE59806142D1 (de) 2002-12-12
EP0869538A1 (fr) 1998-10-07
US6054811A (en) 2000-04-25
JPH10283998A (ja) 1998-10-23

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