WO2009066243A2 - Lampe à décharge - Google Patents

Lampe à décharge Download PDF

Info

Publication number
WO2009066243A2
WO2009066243A2 PCT/IB2008/054846 IB2008054846W WO2009066243A2 WO 2009066243 A2 WO2009066243 A2 WO 2009066243A2 IB 2008054846 W IB2008054846 W IB 2008054846W WO 2009066243 A2 WO2009066243 A2 WO 2009066243A2
Authority
WO
WIPO (PCT)
Prior art keywords
reflector
discharge
discharge lamp
light
burner
Prior art date
Application number
PCT/IB2008/054846
Other languages
English (en)
Other versions
WO2009066243A3 (fr
Inventor
Sven Schellinger
Original Assignee
Philips Intellectual Property & Standards Gmbh
Koninklijke Philips Electronics N.V.
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 Philips Intellectual Property & Standards Gmbh, Koninklijke Philips Electronics N.V. filed Critical Philips Intellectual Property & Standards Gmbh
Publication of WO2009066243A2 publication Critical patent/WO2009066243A2/fr
Publication of WO2009066243A3 publication Critical patent/WO2009066243A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/025—Associated optical elements
    • 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

Definitions

  • the invention relates to the field of discharge lamps, particularly high intensity discharge (HID) lamps or ceramic discharge material (CDM) lamps or high pressure discharge (HPD) lamps, which may be used as motor vehicle lamps for illumi- nating a street or the like.
  • HID high intensity discharge
  • CD ceramic discharge material
  • HPD high pressure discharge
  • an HID lamp which is arranged inside a motor vehicle lamp housing.
  • the HID lamp comprises a reflector pointing towards an opening of the lamp housing, so that light emitted by the HID lamp is reflected to a street instead of being absorbed by the lamp housing.
  • the emitted light may comprise a certain percentage of discolored light differing in color from the mainly white color provided by a discharge arc inside a burner of the discharge lamp.
  • the emitted light may comprise a certain percentage of discolored light differing in color from the mainly white color provided by a discharge arc inside a burner of the discharge lamp.
  • a discharge lamp comprising a reduced amount of discolored light.
  • a discharge lamp particularly HID- or CDM- or HPD-lamp, comprising a burner for emitting light connectable to a socket for mechanical connection to a lighting device, wherein the burner comprises a discharge vessel for providing a discharge arc, and a reflector arranged adjacent to the coolest area and/or lowest area of the discharge vessel during operation.
  • the discharge lamp may comprise the socket, which may be adapted for mechanically connecting the discharge lamp to a lighting device, like a motor vehicle lamp.
  • salts may condense to the glass body of the discharge vessel, wherein the condensation occurs mainly at the coolest area of the discharge vessel during operation.
  • the salts are liquid the liquid salts flow to the lowest area of the discharge vessel with respect to gravity.
  • the discharge lamp is normally arranged in horizontal direction, so that the coolest area of the discharge vessel is the lowest area at the same time.
  • a Xe-HID-lamp the light emitted by the dis- charge arc inside the discharge vessel is partially discolored to yellow by reflection by and/or transmission through the condensed and/or liquid salts.
  • the reflector of the discharge lamp according to the invention is used for reflecting the discolored light due to a transmission, this means a passing through, of light emitted by the discharge arc through the condensed and/or liquid salts inside the discharge vessel. Further light emitted by the salts may be reflected. Due to the reflector, which may be arranged only in the area of the discharge vessel, the transmitted light, this means the light passed through the salts, can be reflected back to the salts leading to an absorption of the discolored light or to an interfering with the discolored light reflected by the salts. This in turn leads to a reduced amount of discolored light. Further a color temperature of ca. 5000K or higher can be expected for the discharge lamp according to the invention. Particularly the built in space is reduced, since a reflector of a lamp housing can be saved.
  • the chromaticity coordinate of the light emitted by the discharge lamp comprises a X-coordinate in the range of 0.360 - 0.395, preferably 0.365 - 0.385, most preferred 0.375 - 0.380 and a Y-coordinate in the range of 0.360 - 0.395, preferably 0.370 - 0.390, most preferred 0.380 - 0.390 in the CIE 1931 diagram.
  • the reflector comprises a color filter, particularly a blue filter, for filtering discolored light due to a transmission of light emitted by the discharge arc through condensed and/or liquid salts inside the discharge vessel. It is due to rough theoretical calculations expected an increased light efficiency, particularly increased integral lumen output, of ca. 30%. Due to the filter the discolored light reflected by the reflector may be added to the discolored light reflected by the salts to provide additional white light instead of providing discolored or annihilated light.
  • a color filter particularly a blue filter
  • the reflector comprises a weighted absorption chosen such, that during operation the amount of light reflected by the condensed and/or liquid salts and the amount of light transmitted through the condensed and/or liquid salts and reflected by the reflector add each other to mainly white light.
  • the reflector comprises retro reflection elements, particularly cat-eyes. Due to the retro reflection elements a defined reflection direction can be safeguarded. Particularly it is possible, for instance by using cat-eyes, to reflect the discolored light into the same direction from which the light was coming.
  • the reflector is arranged spaced to the discharge vessel and connected to the socket and/or the burner.
  • a specific reflective coating of the burner in the area of the discharge vessel is rendered unnecessary so that it is possible to use the same kind of burner already existing for other applications.
  • the used burner is adapted to be made by mass production leading to reduced production costs.
  • the reflector comprises a backlead wire.
  • the backlead wire may be connected to a distal electrode of the burner, this means connected to the electrode arranged opposite to the socket of the discharge lamp.
  • the reflector itself and/or a reflective coating and/or a line through the body of the reflector may provide the backlead wire. Due to the combination of two different functions to the reflector an additional single backlead wire is not necessary.
  • the reflector comprises an insulating layer, particularly an insu- lating coating. This prevents a discharge between the electrodes of the discharge lamp to the reflector, particularly when the reflector comprises the backlead wire. Further the electrical insulation of the reflector reduces the risk of electrical malfunctions.
  • the design of the reflector may be of any kind.
  • the reflector is designed mainly as part of a ring cylinder, which may extend in circumferen- tial direction over an angle ⁇ of 20° ⁇ ⁇ ⁇ 180°, particularly 30° ⁇ ⁇ ⁇ 120°, preferably 45° ⁇ ⁇ ⁇ 90°.
  • the reflector is arranged mainly coaxial to the expected discharge arc inside the discharge vessel. A low amount of material is sufficient for the reflector to provide a reflection of mainly all of the discolored light transmitting the salts.
  • the invention further relates to a motor vehicle lamp comprising a hous- ing and a discharge lamp, which may be designed as previously described, wherein the discharge lamp comprises a socket to which the burner is connected and the discharge lamp is connected to the housing via the socket.
  • the socket of the lamp may be made of an insulating material, preferably a plastic material, for instance PPS (polyphenylene sulfide, (SCeFLt) n ).
  • PPS polyphenylene sulfide, (SCeFLt) n
  • the motor vehicle lamp comprises a reduced amount of discolored light due to the specific reflector of the discharge lamp.
  • the motor vehicle lamp comprises a lens for guiding light emitted by the discharge lamp, wherein the design of the lens is shortened due to the emitted light shadowed by the reflector. Since a part of the emitted light is reflected by the reflector only a part of the lens may be active during operation. Thus, it is possible to cut the unused part of a normally designed lens away, so that the built in space is reduced. Further a clearly defined bright-dark cut-off may be provided by the reflector and/or the shortened lens. The risk of blinding an oncoming driver is reduced.
  • Fig. 1 is a schematic side view of a discharge lamp according to the in- vention
  • Fig. 2 is a schematic top view of the discharge lamp of Fig. 1
  • Fig. 3 is a schematic detailed view of the discharge lamp of Fig. 1.
  • the discharge lamp 10 illustrated in Fig. 1 comprises a socket 12 to which a burner 14 is connected.
  • the socket 12 comprises a ring-pinstripe 16.
  • the pinstripe 16 comprises two linear pinstripes 18. Further the pinstripes 16, 18 provide a defined bright-dark cut-off. In a discharge lamp 10 according to the projection type the pinstripes 16, 18 may be saved.
  • the burner 14 comprises a discharge vessel 20, where light is generated. Below the burner 14 with respect to gravity a reflector 22 is arranged.
  • the reflector 22 is shaped like a part of a tube (Fig. 2).
  • the tubular reflector 22 extends in circumferential direction over an angle ⁇ of ca. 50°. Due to the design of the reflector 22 the part below the pinstripes 18 is shadowed by the reflector 22 providing a well defined bright-dark cut-off. Further discolored light generated inside the discharge vessel 20 and transmitted through condensed and/or liquid salts 24 can be reflected reducing the amount of discolored light.
  • a backlead wire 26 is lead through the reflector 22 from a distal electrode 28 to the socket 12.
  • a discharge arc 30 is provided during operation between a proximal electrode 32 and the distal electrode 28 due to a high voltage applied to the electrodes 28, 32. Due to the discharge arc 30 mainly white light is generated. A first beam 34 consisting of mainly white light may leave the burner 14 from the discharge arc 30. A second beam 36 emitted from the discharge arc 30 may be reflected by the salts 24 leading to a reflected beam 38, which may be discolored to for instance yellow light. A third beam 40 may transmit through the salts 24 and may be discolored to for instance yellow light. The third beam 40 is reflected by a reflective layer 42, which particularly comprises a color filter. Due to the color filter the third beam 40 is reflected as filtered beam 44 consisting for instance of mainly blue light. The yellow reflected beam 38 and the blue filtered beam 44 may be added to mainly white light increasing the efficiency of the discharge lamp 10.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

La présente invention concerne une lampe à décharge (10) qui comprend un brûleur (14) destiné à émettre de la lumière, connectable à une douille (12) pour connexion mécanique à un dispositif d'éclairage, ledit brûleur (14) comprenant un récipient à décharge (20) pour fournir un arc de décharge (30), et un réflecteur (22) placé à côté de la zone la plus froide et/ou la zone la plus basse du récipient à décharge (20) au cours du fonctionnement. Il s'est avéré que, dans le récipient à décharge (20), des sels (24) peuvent se condenser sur le corps de verre du récipient à décharge (20), la condensation se produisant essentiellement dans la zone la plus froide du récipient à décharge (20) au cours du fonctionnement. En raison du réflecteur (22), la lumière transmise (40) peut être réfléchie sur les sels (24), entraînant une absorption de la lumière transmise décolorée (40) ou une interférence avec la lumière décolorée (38) réfléchie par les sels (24). Ceci entraîne à son tour une quantité réduite de lumière décolorée.
PCT/IB2008/054846 2007-11-22 2008-11-19 Lampe à décharge WO2009066243A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07121268 2007-11-22
EP07121268.2 2007-11-22

Publications (2)

Publication Number Publication Date
WO2009066243A2 true WO2009066243A2 (fr) 2009-05-28
WO2009066243A3 WO2009066243A3 (fr) 2009-10-22

Family

ID=40667917

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2008/054846 WO2009066243A2 (fr) 2007-11-22 2008-11-19 Lampe à décharge

Country Status (1)

Country Link
WO (1) WO2009066243A2 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5998939A (en) * 1996-05-09 1999-12-07 Philips Electronics North America Corporation High frequency HID lamp system
US20020063503A1 (en) * 2000-11-28 2002-05-30 Koito Manufacturing Co., Ltd. Discharge bulb
US6441541B1 (en) * 1999-08-25 2002-08-27 General Electric Company Optical interference coatings and lamps using same
US6530678B1 (en) * 2000-01-28 2003-03-11 Heidi Anette Bahren Lightning unit
US20050140292A1 (en) * 2002-04-19 2005-06-30 Koninkijke Philips Electronics N.V. Gas-discharge lamp with a colour-compensating filter
US20060152155A1 (en) * 2003-01-15 2006-07-13 Georg Henninger Lamp and lighting unit with interference coating and blocking device for improved uniformity of color temperature

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5998939A (en) * 1996-05-09 1999-12-07 Philips Electronics North America Corporation High frequency HID lamp system
US6441541B1 (en) * 1999-08-25 2002-08-27 General Electric Company Optical interference coatings and lamps using same
US6530678B1 (en) * 2000-01-28 2003-03-11 Heidi Anette Bahren Lightning unit
US20020063503A1 (en) * 2000-11-28 2002-05-30 Koito Manufacturing Co., Ltd. Discharge bulb
US20050140292A1 (en) * 2002-04-19 2005-06-30 Koninkijke Philips Electronics N.V. Gas-discharge lamp with a colour-compensating filter
US20060152155A1 (en) * 2003-01-15 2006-07-13 Georg Henninger Lamp and lighting unit with interference coating and blocking device for improved uniformity of color temperature

Also Published As

Publication number Publication date
WO2009066243A3 (fr) 2009-10-22

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