EP0576071A1 - Lampe à décharge dans la vapeur de mercure à haute pression - Google Patents

Lampe à décharge dans la vapeur de mercure à haute pression Download PDF

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Publication number
EP0576071A1
EP0576071A1 EP93201725A EP93201725A EP0576071A1 EP 0576071 A1 EP0576071 A1 EP 0576071A1 EP 93201725 A EP93201725 A EP 93201725A EP 93201725 A EP93201725 A EP 93201725A EP 0576071 A1 EP0576071 A1 EP 0576071A1
Authority
EP
European Patent Office
Prior art keywords
lamp
discharge
discharge space
high pressure
range
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
EP93201725A
Other languages
German (de)
English (en)
Other versions
EP0576071B1 (fr
Inventor
Hanns Ernst Fischer
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Philips Electronics NV
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 Koninklijke Philips Electronics NV, Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP93201725A priority Critical patent/EP0576071B1/fr
Publication of EP0576071A1 publication Critical patent/EP0576071A1/fr
Application granted granted Critical
Publication of EP0576071B1 publication Critical patent/EP0576071B1/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
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
    • H01J5/54—Means forming part of the tube or lamps for the purpose of providing electrical connection to it supported by a separate part, e.g. base
    • H01J5/56—Shape of the separate part
    • 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
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
    • H01J61/822—High-pressure mercury lamps

Definitions

  • the invention relates to a high pressure mercury discharge lamp comprising a quartz glass lamp vessel having a region surrounding a discharge space; spaced-apart tungsten electrodes defining a discharge path, disposed in the lamp vessel, and connected to current conductors which extend from the lamp vessel to the exterior; a filling of at least 0.2 mg Hg/mm3, 10 ⁇ 6 - 10 ⁇ 4 ⁇ mol Hal/mm3, wherein Hal is selected from Cl, Br and I, and rare gas in the discharge space.
  • Such a lamp is known from EP 0 338 637-A2.
  • the known lamp has the advantage that, owing to its high operating pressure of at least 200 bar, its radiation contains a substantial amount of continuous radiation in the visible portion of the spectrum.
  • the lamp has a long life, a high lumen maintenance and a small variation of its colour point during its life.
  • the lamp known from said EP Application has a elongate, narrow, cylindrical or elliptical lamp vessel and consumes a low power of no more than 50 W.
  • the luminous flux of the known lamp is too small.
  • the lamp is, however, already highly loaded by more than 1 W/mm2.
  • Said narrow range prevents the known lamp from being more highly loaded in order to consume a higher power. Also, it appears to be impossible to obtain a higher power consumption, while maintaining a long useful life, by enlarging the dimensions of the lamp vessel by normal up-scaling methods. In doing so, convection currents inside the discharge space would increase. This would have the effect that wall portions above the discharge would get a increased thermal load, whereas portions below the discharge would be loaded at too low a level.
  • the lamp of the invention as defined by the wording of the claim taken as a whole of mutually dependent features fulfils the object of the invention.
  • the size S of the discharge space is outside the rage specified, portions of the wall of the discharge space become too cold to obtain the operating pressure required.
  • the discharge space is either purely spherical or rather bulkily ellipsoidal. This is in contrast to the lamp of the EP Application cited. Said application mentions a elongate cylindrical envelope of a 30 W low power lamp, having a length/diameter ratio of 2.7.
  • the known 40 W lamp has a length/diameter ratio of 2.0, but the known lamp of highest power, 50 W, is more elongate and has a length/diameter ratio of as much as 2.8.
  • D i is below than the rage specified, the lamp becomes overheated and suffers from a premature failure.
  • D i is above the range specified, the lamp has cold spots and does not attain the pressure required.
  • f has a value in the range of 0.92 - 1.08, more particularly in the rage of 0.95 - 1.05.
  • D o is smaller than specified portions of the wall of the discharge space present above the discharge have too high a temperature and the lamp suffers a premature failure. There is no critical upper limit to D o .
  • the lamp of the invention has a comparatively high yield of 60 lm/W. Because of its relatively high power and the small dimensions of its arc, the discharge path is at most 2 mm long, the lamp has a very high luminosity. The lamp, therefore, is well suited to be used in optical systems. The coordinates of the colour point of the light generated shift only slightly, e.g. ⁇ x and ⁇ y ⁇ 0.005 after 5000 hrs.
  • the lamp of the invention is very well suited to be used for projection purposes, e.g. for the projection of images created by a liquid crystal display panel, e.g. a panel creating moving pictures.
  • Other uses are e.g. search lights, beacons, fibre optical applications, e.g. as the central light source, and endoscopy.
  • Table 1 lamp type power (W) luminous flux on screen (lm) maintenance (%) after 4000 hrs tin halide 200 > 120 60 rare earth metal hal. 200 > 120 0 Hg 100 > 120 > 80
  • the tin halide lamp, the rare earth halide lamp and a embodiment of the high pressure mercury discharge lamp of the invention give the same amount of light on a LCD projection TV screen, although the Hg lamp of the invention consumes only half the power of the other lamps.
  • the maintenance of the luminous flux on the screen alter 4000 hrs of operation is greatest in the case of the Hg lamp.
  • the lamp of the invention is secured to a lamp cap, the current conductors being connected to contacts of the cap.
  • the lamp cap has protrusions facing the discharge space which are tangent to an imaginary sphere having its centre of curvature in the discharge path, as is disclosed in Applicant's non-prepublished EP Application 92 200 385 (PHN 13.606).
  • the lamp of this embodiment is well suited to be used in a optical system having a ring shaped spherical surface for receiving said protrusions in an abutting manner in order to arrange the discharge path in the optical system in a predetermined position, without the need to align the lamp with respect to the system.
  • the high pressure mercury discharge lamp of Fig. 1 comprises a quartz glass lamp vessel 1 having a region 2 surrounding a discharge space 3. Spaced-apart tungsten electrodes 4 defining a discharge path 5 are disposed in the lamp vessel and are connected to current conductors 6 which extend from the lamp vessel to the exterior.
  • the lamp vessel has a filling of at least 0.2 mg Hg/mm3, 10 ⁇ 6 - 10 ⁇ 4 ⁇ mol Hal/mm3, wherein Hal is selected from Cl, Br and I, and rare gas in the discharge space.
  • the lamp vessel 1 has in the region 2 surrounding the discharge space 3 a convex outer surface 7, which in a plane in which D i is situated has a diameter D o which is D o (mm) ⁇ 3.2 + 0.055(mm/W) * P(W) .
  • the length of the discharge path D p is in the range of 1.0 - 2.0 mm and bromine is the selected halogen. Parameters of the lamp shown are represented in the column Ex. 1 of Table 2.
  • the outer surface of the lamp of the invention is suitable for the outer surface of the lamp of the invention to be substantially spherical in shape in the region surrounding the discharge space, as is shown in the drawing.
  • the lamp of Fig. 1 is mounted in a lamp cap 10 having contacts 11 to which respective current conductors 6 are connected.
  • the lamp cap has protrusions 12 facing the discharge space 3 which are tangent to an imaginary sphere having its centre of curvature 20 in the discharge path 5.
  • the lamp of this embodiment is well suited to be used in an optical system having a ring shaped spherical surface for receiving said protrusions in a abutting manner in order to arrange the discharge path in the optical system in a predetermined position, without the need to align the lamp with respect to the system.

Landscapes

  • Discharge Lamps And Accessories Thereof (AREA)
EP93201725A 1992-06-23 1993-06-16 Lampe à décharge dans la vapeur de mercure à haute pression Expired - Lifetime EP0576071B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93201725A EP0576071B1 (fr) 1992-06-23 1993-06-16 Lampe à décharge dans la vapeur de mercure à haute pression

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP92201858 1992-06-23
EP92201858 1992-06-23
EP93201725A EP0576071B1 (fr) 1992-06-23 1993-06-16 Lampe à décharge dans la vapeur de mercure à haute pression

Publications (2)

Publication Number Publication Date
EP0576071A1 true EP0576071A1 (fr) 1993-12-29
EP0576071B1 EP0576071B1 (fr) 1996-09-04

Family

ID=26131497

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93201725A Expired - Lifetime EP0576071B1 (fr) 1992-06-23 1993-06-16 Lampe à décharge dans la vapeur de mercure à haute pression

Country Status (1)

Country Link
EP (1) EP0576071B1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19610385A1 (de) * 1996-03-16 1997-09-18 Bosch Gmbh Robert Gasentladungslampe, insbesondere für Kraftfahrzeug-Scheinwerfer
WO1998031143A3 (fr) * 1997-01-10 1998-10-01 Koninkl Philips Electronics Nv Systeme eclairant pour un dispositif projecteur d'image
EP0901151A1 (fr) * 1997-09-04 1999-03-10 Matsushita Electronics Corporation Lampe à décharge à vapeur de mercure à haute pression
US6018214A (en) * 1997-01-10 2000-01-25 U.S. Philips Corporation Illumination system for an image projection device
EP1271595A1 (fr) * 2001-06-13 2003-01-02 Ushiodenki Kabushiki Kaisha Lampe à décharge à très haute pression du type à arc court
WO2003100822A1 (fr) * 2002-05-23 2003-12-04 Matsushita Electric Industrial Co., Ltd. Lampe a vapeur de mercure a pression elevee

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004082A1 (fr) * 1978-03-10 1979-09-19 Mitsubishi Denki Kabushiki Kaisha Méthode d'application d'énergie à des lampes à décharge à haute pression de vapeur de métal
EP0338637A2 (fr) * 1988-04-21 1989-10-25 Philips Patentverwaltung GmbH Lampe à décharge à vapeur de mercure à haute pression

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004082A1 (fr) * 1978-03-10 1979-09-19 Mitsubishi Denki Kabushiki Kaisha Méthode d'application d'énergie à des lampes à décharge à haute pression de vapeur de métal
EP0338637A2 (fr) * 1988-04-21 1989-10-25 Philips Patentverwaltung GmbH Lampe à décharge à vapeur de mercure à haute pression

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19610385A1 (de) * 1996-03-16 1997-09-18 Bosch Gmbh Robert Gasentladungslampe, insbesondere für Kraftfahrzeug-Scheinwerfer
WO1998031143A3 (fr) * 1997-01-10 1998-10-01 Koninkl Philips Electronics Nv Systeme eclairant pour un dispositif projecteur d'image
US6018214A (en) * 1997-01-10 2000-01-25 U.S. Philips Corporation Illumination system for an image projection device
EP0901151A1 (fr) * 1997-09-04 1999-03-10 Matsushita Electronics Corporation Lampe à décharge à vapeur de mercure à haute pression
US6232720B1 (en) 1997-09-04 2001-05-15 Matsushita Electronics Corporation High-pressure mercury vapor discharge lamp
EP1271595A1 (fr) * 2001-06-13 2003-01-02 Ushiodenki Kabushiki Kaisha Lampe à décharge à très haute pression du type à arc court
US6762557B2 (en) 2001-06-13 2004-07-13 Ushiodenki Kabushiki Kaisha Super-high pressure discharge lamp of the short arc type
WO2003100822A1 (fr) * 2002-05-23 2003-12-04 Matsushita Electric Industrial Co., Ltd. Lampe a vapeur de mercure a pression elevee

Also Published As

Publication number Publication date
EP0576071B1 (fr) 1996-09-04

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