EP1675157A2 - Ampoule de lampe à décharge - Google Patents

Ampoule de lampe à décharge Download PDF

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Publication number
EP1675157A2
EP1675157A2 EP05027022A EP05027022A EP1675157A2 EP 1675157 A2 EP1675157 A2 EP 1675157A2 EP 05027022 A EP05027022 A EP 05027022A EP 05027022 A EP05027022 A EP 05027022A EP 1675157 A2 EP1675157 A2 EP 1675157A2
Authority
EP
European Patent Office
Prior art keywords
piston
combustion chamber
central region
outer contour
discharge lamp
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.)
Granted
Application number
EP05027022A
Other languages
German (de)
English (en)
Other versions
EP1675157A3 (fr
EP1675157B1 (fr
Inventor
Henning Dr. Rehn
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 EP1675157A2 publication Critical patent/EP1675157A2/fr
Publication of EP1675157A3 publication Critical patent/EP1675157A3/fr
Application granted granted Critical
Publication of EP1675157B1 publication Critical patent/EP1675157B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J61/30—Vessels; Containers
    • 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 piston for discharge lamps, in particular for short-arc discharge lamps, according to claim 1.
  • Discharge lamps are used today in many fields, for example as projection light sources.
  • a discharge lamp always comprises a piston or burner, for example made of quartz glass, which has a gas space filled with gas.
  • the so-called barrel which is filled for example with xenon, other noble gases or metal vapors, such as mercury, two opposing electrodes are included, between which the discharge takes place.
  • both the outer contour of the piston and the barrel have a central region that is toroidal in shape. That is, the sectional figure of one of these middle Areas having any plane containing the piston axis is a circular segment of radius r whose center is at a distance R from the piston axis. In previous piston designs, the center of this circle segment is between this and the piston axis (R> 0).
  • the centers of the circle segments belonging to the middle regions of the outer contour of the piston and the barrel lie in the same normal plane to the piston axis, so that both tori are concentric.
  • central regions are mirror-symmetric with respect to this normal plane continuously into edge regions which are frustoconical in the barrel, tubular in the outer contour. Between the middle and the tubular portion of the outer contour, a constriction with predetermined radii is present.
  • both the outer contour and the shape of the barrel is always not only rotationally symmetrical to the piston axis, but also mirror-symmetrical to the normal plane.
  • the optical efficiency i. the ratio of absorbed current to emitted light, but not yet optimal.
  • the invention has for its object to provide a piston for discharge lamps with a higher optical efficiency available.
  • a piston for a discharge lamp according to claim 1 comprises in known manner an inner combustion chamber, wherein the outer contour of the piston and the combustion chamber each have a central region and adjoining edge regions, each central region being toroidal.
  • a piston for a discharge lamp according to claim 2 comprises in known manner an inner combustion chamber, wherein the outer contour of the piston and the combustion chamber each have a central region and adjoining edge regions, each central region is torus-shaped and wherein each edge region of the combustion chamber frustoconical away from the central region is formed rotationally symmetrical to the piston axis with a certain cone angle.
  • these cone angles of the two edge regions of the combustion chamber are unequal in size.
  • the cone angle of one of the two edge regions of the combustion chamber in the range between 22 ° and 60 °, particularly preferably between 30 ° and 45 °, the cone angle of the other edge region in the range between 0 ° and 30 °, preferably between 10 ° and 20 °.
  • cone angles of 0 ° are possible, so that instead of a tapered truncated cone, a tubular edge region is present.
  • the length of each edge region may be suitably chosen, for example so that the total length of the combustion chamber remains unchanged compared with a conventional one. Also included is the possibility that one or both edge regions have a vanishing length, ie that the combustion chamber consists essentially only of the central toroidal region.
  • the discharge lamp with a piston according to the invention has a reflector
  • the reflector-side edge region of the combustion chamber has the larger, the other edge region the smaller cone angle.
  • the circular segment which forms the central region of the outer contour and / or of the combustion chamber, is advantageously displaced toward the piston axis in such a way that the combustion chamber and / or the wall thickness of the piston in the middle region is equal to that of pistons according to the prior art. In this way it is possible to retain existing production tools and processes and to use empirically determined optima for these values.
  • FIG. 1 schematically shows a discharge lamp 1 with a piston 2 according to the invention.
  • An elliptical reflector 5 is arranged around this, concentrating the light generated by the burner in the secondary focal plane.
  • the piston 2 has an outer contour with a central region 2a, which is toroidal.
  • Figure 2 shows the corresponding Parameters.
  • the center of the circle segment formed by a section of the outer contour with any plane containing the piston axis (radius r B ) has a distance R B to the piston axis, which can be positive or negative.
  • the outer contour can be thought to have been created by moving a segment of a circle having a radius r B whose center lies on the piston axis normal to this piston axis by a radius of rotation R B. If the circular segment, as in FIG. 2, is displaced away from the piston axis in the direction of the circular segment, the radius of rotation is positive (R B > 0), negative in the opposite direction when displaced via the piston axis (R B ⁇ 0). Subsequently, the circular segment rotates about the piston axis and thereby passes over the central region 2a of the outer contour.
  • An edge region 2b adjoins this middle region on both sides, which in turn adjoins a shank region 2c and is constricted relative thereto.
  • the geometric shape of the skirt and shank region of the piston is not essential to the present invention and may correspond to those of the prior art pistons.
  • the piston has a combustion chamber 3 filled with gas or metal vapor, in which electrodes 4 are arranged.
  • the connection of the electrodes is not shown for the sake of clarity in the schematic figures.
  • the combustion chamber also has a toric central region 3 a, the characteristic quantities of which are shown in FIG. 2. As shown in Figure 2, the center of the corresponding circle segment is displaced beyond the piston axis.
  • the combustion chamber can be thought to have been created by moving the center point of a circle segment with radius r T away from the piston axis normal to this piston axis by a turning radius R T.
  • the piston axis is between the circle segment and its center, ie the radius of rotation is negative (R T ⁇ 0). Equivalent to this is the turning radius negative if and only if the maximum distance from the Piston axis to the swept surface is smaller than the segment radius.
  • the circle segment rotates about the piston axis and thereby passes over the central region 3a of the combustion chamber.
  • a truncated conical edge region 3b adjoins this middle region on both sides, which tapers from the central region 3a outwardly rotationally symmetrical to the piston axis with a specific cone angle ⁇ 1 or ⁇ 2 (FIG. 3). At the end of the combustion chamber is sealed.
  • the cone angles ⁇ 1 and ⁇ 2 of the two edge regions of the combustion chamber are unequal in size.
  • the area facing the reflector 5 is significantly steeper than usual in the prior art, the opposite area significantly flatter.
  • FIG. 4 shows by way of example a piston according to a second embodiment of the present invention.
  • the central region 3a of the combustion chamber indicated by the dashed circle, whose segment sweeps over the toroidal region, is displaced from the central region 2a of the outer contour by a distance z in the direction of the piston axis.
  • the central region of the combustion chamber is displaced in the direction of the reflector 5.
  • the center of the center circle of the outer contour preferably remains in the first focal point of the reflector 5.
  • the centers of the segments (indicated by dashed lines in FIG. 4) which form the toroidal central regions of the outer contour and of the combustion chamber have a distance z in the direction of the piston axis.
  • negative radii refer to a displacement of the circle segment beyond the piston axis.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
EP05027022A 2004-12-23 2005-12-09 Ampoule de lampe à décharge Expired - Lifetime EP1675157B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004062265A DE102004062265A1 (de) 2004-12-23 2004-12-23 Kolben für Entladungslampen

Publications (3)

Publication Number Publication Date
EP1675157A2 true EP1675157A2 (fr) 2006-06-28
EP1675157A3 EP1675157A3 (fr) 2007-06-06
EP1675157B1 EP1675157B1 (fr) 2010-02-24

Family

ID=35851973

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05027022A Expired - Lifetime EP1675157B1 (fr) 2004-12-23 2005-12-09 Ampoule de lampe à décharge

Country Status (8)

Country Link
US (1) US7545099B2 (fr)
EP (1) EP1675157B1 (fr)
JP (1) JP2006179489A (fr)
CN (1) CN1828821B (fr)
AT (1) ATE459093T1 (fr)
CA (1) CA2531085A1 (fr)
DE (2) DE102004062265A1 (fr)
TW (1) TW200636796A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009060399A1 (fr) * 2007-11-06 2009-05-14 Koninklijke Philips Electronics N.V. Système d'éclairage, lampe à décharge haute pression et système de projection d'images

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5272983B2 (ja) * 2009-09-11 2013-08-28 ウシオ電機株式会社 光源装置
US9552976B2 (en) 2013-05-10 2017-01-24 General Electric Company Optimized HID arc tube geometry

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2856955B2 (ja) * 1991-08-06 1999-02-10 ウシオ電機株式会社 ショートアーク型メタルハライドランプ光源装置
JPH11238488A (ja) * 1997-06-06 1999-08-31 Toshiba Lighting & Technology Corp メタルハライド放電ランプ、メタルハライド放電ランプ点灯装置および照明装置
JPH10340704A (ja) * 1997-06-06 1998-12-22 Stanley Electric Co Ltd 自動車用放電ランプ
JP3847927B2 (ja) * 1997-11-18 2006-11-22 キヤノン株式会社 発光管及びそれを用いた光源装置
JP3531539B2 (ja) * 1999-06-08 2004-05-31 ウシオ電機株式会社 光源装置
DE10151267A1 (de) * 2001-10-17 2003-04-30 Philips Corp Intellectual Pty Beleuchtungseinheit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009060399A1 (fr) * 2007-11-06 2009-05-14 Koninklijke Philips Electronics N.V. Système d'éclairage, lampe à décharge haute pression et système de projection d'images

Also Published As

Publication number Publication date
CA2531085A1 (fr) 2006-06-23
US7545099B2 (en) 2009-06-09
EP1675157A3 (fr) 2007-06-06
TW200636796A (en) 2006-10-16
CN1828821B (zh) 2011-04-27
EP1675157B1 (fr) 2010-02-24
DE102004062265A1 (de) 2006-07-13
CN1828821A (zh) 2006-09-06
JP2006179489A (ja) 2006-07-06
US20060220560A1 (en) 2006-10-05
DE502005009080D1 (de) 2010-04-08
ATE459093T1 (de) 2010-03-15

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