EP0449639A2 - Système de polarisation pour réduire la perte d'ions dans les lampes - Google Patents

Système de polarisation pour réduire la perte d'ions dans les lampes Download PDF

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Publication number
EP0449639A2
EP0449639A2 EP91302776A EP91302776A EP0449639A2 EP 0449639 A2 EP0449639 A2 EP 0449639A2 EP 91302776 A EP91302776 A EP 91302776A EP 91302776 A EP91302776 A EP 91302776A EP 0449639 A2 EP0449639 A2 EP 0449639A2
Authority
EP
European Patent Office
Prior art keywords
chamber
circuit means
electrically conductive
ballast
electrical system
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
EP91302776A
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German (de)
English (en)
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EP0449639A3 (en
EP0449639B1 (fr
Inventor
Joe Allen Nuckolls
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.)
Hubbell Inc
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Hubbell Inc
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Filing date
Publication date
Application filed by Hubbell Inc filed Critical Hubbell Inc
Publication of EP0449639A2 publication Critical patent/EP0449639A2/fr
Publication of EP0449639A3 publication Critical patent/EP0449639A3/en
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Publication of EP0449639B1 publication Critical patent/EP0449639B1/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
    • H01J61/24—Means for obtaining or maintaining the desired pressure within the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/10—Shields, screens, or guides for influencing the discharge
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
    • H05B41/18—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having a starting switch
    • H05B41/19—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having a starting switch for lamps having an auxiliary starting electrode

Definitions

  • This invention relates to luminaire and ballast circuit techniques for minimizing the loss of plasma chemicals and ions from the confining arc tube of an energized plasma in a high intensity discharge lamp.
  • Each type of lamp is produced with a fill or starting gas, with certain amounts of metals, halides and amalgam, and frequently with a mixture of elements, each to be operated at a selected partial vapor pressure magnitude, so that the light output will have the desired color spectrum and lumen output level when it is appropriately electrically energized.
  • a fill or starting gas with certain amounts of metals, halides and amalgam, and frequently with a mixture of elements, each to be operated at a selected partial vapor pressure magnitude, so that the light output will have the desired color spectrum and lumen output level when it is appropriately electrically energized.
  • the characteristics of the lamp deteriorate with color shifts and fall-off of lumen output level and are no longer in accordance with the design and operating characteristics desired.
  • the useful life of the lamp is shortened considerably because of the drops in lamp performance and because the lamp operating voltage rises which results in undesired electrical operating changes.
  • An object of the present invention is to provide an electrical system to reduce the loss of gas ions from lamp structures in a luminaire.
  • a further object is to provide a circuit which is simple and inexpensive, which operates effectively and which, in conjunction with the ballast and fixture, can be provided for lamps and ballasts of a wide variety of types and sizes.
  • the invention comprises an electrical system for inhibiting ion loss from a plasma conductor in a high intensity discharge lamp.
  • the lamp includes an arc tube chamber for containing an ionizable fill gas and plasma materials including a metal halide which when evaporated and in discharge contribute to the formation of a plasma conductor, the arc tube chamber having electrical terminals.
  • First circuit means including a ballast provides AC operating voltage to the terminals of the arc tube chamber.
  • An electrically conductive surface substantially surrounds and encloses the arc tube chamber.
  • Second circuit means is connected to a voltage source for developing a DC potential, the second circuit means having positive and negative output terminals.
  • Third circuit means connects one of the DC output terminals to one or both of the electrical terminals of the arc tube. The other of the DC output terminals is connected to the conductive surface enclosing the arc tube to establish an electric field between the surface and the arc tube thereby to confine in the chamber those ions having the same polarity as the surface.
  • the electrically conductive surface includes a reflector normally used physically close to the lamp and, in a fixture having a transparent light window surface near the lamp but on the opposite side thereof from the reflector, a second conductive surface comprising a substantially transparent thin film on the glass or plastic window can be provided to establish a lamp-enclosing electric bias voltage field.
  • a reflector normally used physically close to the lamp and, in a fixture having a transparent light window surface near the lamp but on the opposite side thereof from the reflector, a second conductive surface comprising a substantially transparent thin film on the glass or plastic window can be provided to establish a lamp-enclosing electric bias voltage field.
  • Other conductive parts of the fixture housing can also be used as bias-producing conductive surfaces but the physically close reflector has the greatest impact.
  • Some luminaires have a primary reflector placed in front of the lamp and a larger secondary reflector placed behind the lamp. Each of these reflectors can provide bias surfaces.
  • Fig. 1 illustrates, in a simplified form, the interconnection of major components of the apparatus in accordance with the invention.
  • the invention will be described in the context of a luminaire having a high pressure sodium or metal halide light source therein. It should be emphasized, however, that a variety of types of lighting fixtures can benefit from the invention and that a variety of other types of discharge lamps using gases other than sodium are usable with the invention.
  • the luminaire of Fig. 1 has a housing, schematically indicated at 10, having a transparent portion 12 which can be a refractor or an openable access door typically having a glass panel therein.
  • the light source itself includes a plasma conductor 14 formed within a chamber such as an arc tube 16 which contains an ionizable gas and which can be surrounded by an outer jacket or envelope 17.
  • the lamp may, however, not have an outer jacket as is the case with many double-ended lamps.
  • the shapes and sizes of these components are variable with the type of lamp and the manufacturer.
  • a reflector 18 is schematically illustrated as being on the opposite side of the light source from the door or refractor 12 and, as is commonly the case, can be curved to direct light from a portion of the source to create a particular light output pattern as well as to enclose the light source.
  • a supply circuit has terminals 22 which are connectable to a standard AC source of voltage.
  • Supply circuit 20 provides an AC output on conductors 24 and 25 which are connected to the lamp terminals at opposite ends of chamber 16.
  • a DC circuit 28 is conveniently powered from the supply circuit 20 and produces a DC potential at output terminals 30 and 31 which are positive and negative, respectively.
  • the positive terminal of DC circuit 28 is connected to reflector 18 and negative terminal 31 is connected to the arc tube at one end of the plasma conductor.
  • the AC supply circuit 20 provides AC operating current on lines 24 and 25 into the ends of arc tube chamber 16 to the plasma conductor in chamber 16, maintaining the plasma in a condition to create light which passes through door or refractor 12.
  • the light is directed or focused by reflector 18.
  • DC potentials are placed on the reflector and the plasma conductor causing the reflector to be positive with respect to the plasma.
  • the plasma contains sodium ions which have positive charges
  • a positive potential with respect to the plasma conductor is placed on reflector 18, causing an electric field between the reflector and the plasma ions which tends to repel the positively charged plasma particles away from the reflector and which thereby helps confine those particles within chamber 16.
  • This electric field significantly reduces the amount of migration of these positive ions through the walls of arc tube 16, lengthening the life of the tube and maintaining the sodium design balance, thus improving the color and light output thereof for an extended interval of time.
  • the operation of the apparatus of Fig. 1 is improved by adding an electrically conductive coating 34 to a surface of door or refractor 12 and connecting positive terminal 30 to coating 34.
  • the result of this arrangement is to completely enclose the plasma in a repelling electric field from all sides of the light source, enhancing the confinement of ions within the plasma body and further improving and lengthening the operation thereof.
  • Fig. 1 also shows the connection 35 of the positive terminal of the DC source to fixture housing 10.
  • the housing is made partly or entirely of metal or, if not, can be made partially electrically conductive by the addition of a conductive film or filler.
  • connection 35 to this conductive region the entire housing 10 can be used to enhance the field which aids in confinement of the ions in chamber 16.
  • Fig. 2 schematically illustrates the relationship between a light source 38, a reflector 39, a refractor 40 and an enclosing housing 41 where the reflector is metal or has a metallized surface and the refractor 40 also has a metallized surface, both of these components and the conductive housing 41 being connected to the positive terminal of DC source 28 while the negative terminal thereof is connected to the plasma conductor light source.
  • a three-dimensional field 42 is produced between the plasma conductor and the surrounding shell-like bodies which is extremely effective in confining the plasma components within their containing chamber. Because the bodies themselves substantially surround or enclose the light source, the confining effect is considerable.
  • the geometric relationship illustrated is commonly arranged as shown in Fig. 2 for optical reasons but has not been employed for electric field reasons or for the confinement of ions in a plasma stream heretofore.
  • housing 44 is either metal, filled with metal particles or is coated with a metallized surface.
  • the housing includes an opening which receives a glass or plastic refractor 46 having a conductive coating 48 on the inner surface thereof.
  • Coating 48 can be, for example, a thin layer of tin oxide or indium oxide which leaves the refractor substantially transparent but which renders the inner surface thereof electrically conductive. Such a layer can be placed on glass by conventional deposition techniques.
  • Behind the refractor 46 is a plasma chamber 16 surrounded by an outer jacket 17 and behind this light source is a reflector 18.
  • An AC supply circuit indicated generally at 20 includes a conventional metal halide lamp ballast indicated at 50, the ballast typically being a constant wattage auto-transformer or peak lead autoregulator with the tap and common points arranged for connection to an AC source.
  • the usual single ballast capacitor which would be connected in series between the ballast transformer and the plasma chamber, is replaced by two ballast capacitors 52 and 53 which are connected in series with the two AC lines leading from the ballast transformer to the light source.
  • each of capacitors 52 and 53 is selected to have a value of twice the capacitance of the single series capacitor which would normally be used with the ballast transformer. These capacitors provide isolation for the light source so that a DC bias can be placed thereon.
  • a voltage divider means includes a potentiometer 54 connected across the output of transformer 50 with the movable contact 55 being connected to the DC circuit means 28.
  • Contact 55 is connected through a series resistor 56 and diode 58 to the parallel connection of a capacitor 60 and a resistor 61.
  • the other side of the parallel circuit is connected to the common line which is also connected to conductive housing 44 at a screw terminal 62.
  • the positive output terminal of this DC circuit which is the common line, is also connected to reflector 18 and conductive coating 48 on the refractor.
  • the negative side is connected to the movable contact 59 of a potentiometer 57.
  • the ends of the potentiometer are connected to the terminals of the plasma conductor chamber.
  • the resulting field tends to confine positive ions in chamber 16, inhibiting migration thereof through the walls of the chamber. Because the positive terminal is connected to the housing at terminal 62, the housing itself, which is made of conductive material, can participate in creation of the confining field.
  • this apparatus as illustrated in Fig. 3 can be used without coating 48, relying upon the field produced by physically close reflector 18 and the housing.
  • reflector 18 can be formed as a shell-like structure to more fully enclose the chamber and improve the effect of the confining field.
  • diode 58 causes reversal of the DC field so that either positive or negative ions can be confined using essentially the same circuit, the choice being made on the basis of the type of lamp and the ions or chemicals used therein.
  • a circuit which uses an electromagnetic regulator is illustrates in Fig. 4. Many of the components including the housing, refractor, reflector and light source are the same as in Fig. 3 and are similarly numbered.
  • the AC supply circuit indicated generally at 64 includes a magnetic regulator having a core 66 with three windings all of which are electrically insulated from the core and from each other.
  • An isolated primary winding 68 is connectable to a conventional AC source.
  • An output winding 70 is connected at its ends to chamber 14 and is tapped for connection to a starting circuit 72.
  • Starting circuit 72 can be any of a variety of starting circuits which are now conventional in this art, using a discharge circuit to provide voltage pulses across the smaller, upper portion of winding 70 which is magnified by the auto transformer effect in winding 70 to provide a relatively high voltage pulses across conductors 74 and 75 for application to the deionized lamp to effect ignition.
  • a suitable starting circuit is shown, for example, in Fig. 2 and other figures of U.S. patent 4,763,044, Nuckolls et al. Magnetic shunts 65 and 67 extend across windings 68 and 70.
  • a separate floating ballast capacitor winding 76 is provided with a shunt capacitor 78 which performs the ballast capacitor function.
  • This separate ballast winding does not interfere with the electrical isolation of the primary winding and does not interfere with the normal AC operation of the ballast-lamp system.
  • Winding 73 is connected through a diode 80 to a capacitor 82 across which the DC bias voltage appears for connection to the light system components.
  • a bleeder resistor 83 is connected in parallel with capacitor 82.
  • the negative terminal of this DC supply is connected to common line 75 and to the plasma conductor chamber 16.
  • the positive terminal is connected to reflector 18, conductive coating 48 and the conductive housing 44.
  • the function is the same as in connection with the other embodiments discussed above in which a field is produced between the reflector, the refractor and the plasma conductor chamber to confine gases and ions therein.
  • biasing techniques permit lamp design changes such as increased arc tube wall loading (watts per square cm.) with quartz and polycrystalline alumina to generate higher lumen-per-watt (L.P.W.) output and better color and other characteristics without the normal increase in the rate of sodium loss from the plasma and arc tube.
  • Fig. 5 shows a still further embodiment of a plasma-combining circuit apparatus in accordance with the invention which is particularly simple and therefore economically advantageous as well as being effective.
  • an auto-transformer 92 is connected to a AC source and supplies AC current to a lamp indicated generally at 94 through series capacitors 96 and 97.
  • a lamp starting circuit 98 is connected between the lamp sides of capacitors 96 and 97.
  • a reflector 99 is positioned to reflect the light produced within lamp 94.
  • a DC circuit indicated generally at 100 includes the series connection of a diode 102 and a resistor 104 with the addition of a radio frequency choke 106 which is included to block high frequency, high voltage pulses from the lamp starting circuit.
  • the diode is polarized so that the inductive ballast side of capacitor 97 is positive relative to the lamp side of the capacitor, and the polarization of capacitor 96 is also such that the inductive ballast side of the capacitor is positive with respect to the lamp side.
  • Capacitor 96 is dielectrically insulated from the housing of the fixture.
  • a conductor 108 interconnects the neutral or ground side of the line at inductor 92 to the reflector and also to the lamp housing 90.
  • the neutral side of the inductive ballast is positive with respect to the lamp as well as the lamp circuitry on the lamp side of capacitors 96 and 97.
  • the plasma conductor itself is negative with respect to the reflector and the housing, again producing the ion migration-inhibiting field which improves lamp operation and lengthens life.
  • Electrical isolation of capacitor 96 from the fixture housing by dielectric insulation prevents the high frequency, high voltage lamp ignition pulses from circuit 98 from being capacitively shorted out.
  • the ballast secondary coil serves as an inductance which holds off the starting pulses from the starter circuit.
  • the charging network comprising diode 102, resistance 104 and the choke charges the ballast capacitor 96 with the polarity shown.
  • ballast capacitor 97 When the lamp strikes and draws high AC lamp current, part of the charge on capacitor 96 is conducted to ballast capacitor 97 until their DC voltages are equal and opposite so that the net DC voltage around the lamp power loop is zero. However, the lamp plasma circuit is biased negatively with respect to the neutral or metal parts.
  • the DC voltage is self-adjusting by the lamp voltage clamping mechanism in this circuit. Note that two of these charging networks 100 could be used, but it is not necessary because the AC power operation carries the required charge from one capacitor to the other.
  • Resistor 104 typically having a value of 10 K ohms, 1 watt, is used to limit the charging circuit current.
  • the RF choke tends to block the high voltage from the starter, allowing the high frequency, high voltage to raise and ignite the lamp and also keeping the high voltage from damaging other charging circuit components.
  • the diode of course, allows the half-wave DC charging to take place.
  • ballast and starter capacitors are required when the ballast is deenergized, high resistance bleeder resistors can be connected across those capacitors. Rapid discharging, if desired, can be accomplished by connecting a small relay having individual normally closed contacts series connected with a small resistor across each capacitor, the relay coil being connected across the line or the ballast secondary.
  • Fig. 6 shows a reflector arrangement which can be used in conjunction with the present invention to considerable advantage.
  • the lamp 110 is positioned between a primary reflector and a secondary reflector 112.
  • the two reflectors are used to project light from the lamp through refractor or cover 113 in a particular pattern.
  • these components are mounted in a housing 114.
  • the reflectors By connecting one side of the DC supply to both reflectors and the other side of the supply to one or both terminals of the lamp, the reflectors form an enclosing field which is highly effective because the reflectors substantially enclose the lamp and are physically closer to the lamp than the remainder of the housing. Any of the circuit arrangements discussed herein can be applied to this reflector arrangement.
  • a building 120 has a large number of lighting fixtures, two of which are illustrated at 122 and 123.
  • Each fixture typically has a ballast transformer 125 and a ballast capacitor 126 which can be arranged in a manner similar to the circuits illustrated in Figs. 3 and 4 but need not be.
  • Each fixture also has a lamp 127, such as a sodium vapor lamp, and a reflector 128.
  • Starting circuit means can also be provided in or associated with the ballast circuitry.
  • the primary winding of an AC power and DC isolation transformer 130 is connected to the conventional AC lines feeding the building.
  • the fixtures 122, 123, ... are connected in parallel across the high and common terminals of the transformer secondary winding. In the particular embodiment of the fixtures shown, the primary portion of each fixture ballast transformer is connected thus to the AC supply.
  • a DC supply unit 132 is connected between the AC common line from the secondary of transformer 130 and building ground, i.e., the green wire in a three-wire electrical system, with the positive output terminal of the DC source being connected to building ground. This establishes a DC bias between the common line and building ground with ground being positive relative to the common line.

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  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
EP91302776A 1990-03-29 1991-03-28 Système de polarisation pour réduire la perte d'ions dans les lampes Expired - Lifetime EP0449639B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US50088690A 1990-03-29 1990-03-29
US500886 1990-03-29

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EP0449639A2 true EP0449639A2 (fr) 1991-10-02
EP0449639A3 EP0449639A3 (en) 1992-05-06
EP0449639B1 EP0449639B1 (fr) 1996-11-13

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EP91302776A Expired - Lifetime EP0449639B1 (fr) 1990-03-29 1991-03-28 Système de polarisation pour réduire la perte d'ions dans les lampes

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EP (1) EP0449639B1 (fr)
JP (1) JP2978268B2 (fr)
CA (1) CA2037886A1 (fr)
DE (1) DE69123071D1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4224996A1 (de) * 1992-07-29 1994-02-03 Hella Kg Hueck & Co Vorschaltgerät zum Betreiben von Hochdruck-Gasentladungslampen mit niederfrequenter, rechteckförmiger Spannung in Kraftfahrzeugen
DE4400412A1 (de) * 1993-01-05 1994-07-07 Mitsubishi Electric Corp Beleuchtungsvorrichtung mit einer Entladungslampe für Fahrzeuge
FR2705434A1 (fr) * 1993-05-18 1994-11-25 Valeo Vision Projecteur à lampe à décharge et à réflecteur polarisé.
EP0732870A1 (fr) * 1995-03-15 1996-09-18 Matsushita Electric Industrial Co., Ltd. Lampe luminescente à gaz et procédure pour effectuer une lampe luminescente
WO2009137198A2 (fr) * 2008-05-09 2009-11-12 Osram Sylvania, Inc. Lampe réflecteur hid d'un seul tenant insensible aux emi

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE853186C (de) * 1950-09-26 1952-10-23 Siemens Ag Einrichtung zur Entstoerung von vorzugsweise wechselstromgespeisten und langgestreckten Leuchtstoffroehren
FR1413359A (fr) * 1964-10-22 1965-10-08 Ass Elect Ind Perfectionnements à la construction des lampes fluorescentes
GB1227810A (fr) * 1968-10-11 1971-04-07
JPS54132368A (en) * 1978-04-04 1979-10-15 Mitsubishi Electric Corp Fluorescent lamp device
GB2056760A (en) * 1979-08-01 1981-03-18 Gen Electric Discharge lamps
GB2162683A (en) * 1984-07-30 1986-02-05 Tungsram Reszvenytarsasag High pressure sodium vapour lamp
US4763044A (en) * 1986-01-23 1988-08-09 Hubbell Incorporated Start, hot restart and operating lamp circuit
JPH01225098A (ja) * 1988-03-04 1989-09-07 Toshiba Corp 放電灯照明システム、磁場発生源配置方法および放電灯装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE853186C (de) * 1950-09-26 1952-10-23 Siemens Ag Einrichtung zur Entstoerung von vorzugsweise wechselstromgespeisten und langgestreckten Leuchtstoffroehren
FR1413359A (fr) * 1964-10-22 1965-10-08 Ass Elect Ind Perfectionnements à la construction des lampes fluorescentes
GB1227810A (fr) * 1968-10-11 1971-04-07
JPS54132368A (en) * 1978-04-04 1979-10-15 Mitsubishi Electric Corp Fluorescent lamp device
GB2056760A (en) * 1979-08-01 1981-03-18 Gen Electric Discharge lamps
GB2162683A (en) * 1984-07-30 1986-02-05 Tungsram Reszvenytarsasag High pressure sodium vapour lamp
US4763044A (en) * 1986-01-23 1988-08-09 Hubbell Incorporated Start, hot restart and operating lamp circuit
JPH01225098A (ja) * 1988-03-04 1989-09-07 Toshiba Corp 放電灯照明システム、磁場発生源配置方法および放電灯装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 13, no. 544 (E-855)6 December 1989 & JP-A-1 225 098 ( TOSHIBA CORP ) 7 September 1989 *
PATENT ABSTRACTS OF JAPAN vol. 3, no. 154 (M-85)18 December 1979 & JP-A-54 132 368 ( MITSUBISHI DENKI K.K. ) 15 October 1979 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4224996A1 (de) * 1992-07-29 1994-02-03 Hella Kg Hueck & Co Vorschaltgerät zum Betreiben von Hochdruck-Gasentladungslampen mit niederfrequenter, rechteckförmiger Spannung in Kraftfahrzeugen
DE4400412A1 (de) * 1993-01-05 1994-07-07 Mitsubishi Electric Corp Beleuchtungsvorrichtung mit einer Entladungslampe für Fahrzeuge
FR2705434A1 (fr) * 1993-05-18 1994-11-25 Valeo Vision Projecteur à lampe à décharge et à réflecteur polarisé.
EP0732870A1 (fr) * 1995-03-15 1996-09-18 Matsushita Electric Industrial Co., Ltd. Lampe luminescente à gaz et procédure pour effectuer une lampe luminescente
US5955846A (en) * 1995-03-15 1999-09-21 Matsushita Electric Industrial Co., Ltd. Discharge lamp lighting device and a method for lighting a discharge lamp
WO2009137198A2 (fr) * 2008-05-09 2009-11-12 Osram Sylvania, Inc. Lampe réflecteur hid d'un seul tenant insensible aux emi
WO2009137198A3 (fr) * 2008-05-09 2010-01-07 Osram Sylvania, Inc. Lampe réflecteur hid d'un seul tenant insensible aux emi
CN102017060A (zh) * 2008-05-09 2011-04-13 奥斯兰姆施尔凡尼亚公司 Emi控制的整体式hid反射灯
US7950836B2 (en) 2008-05-09 2011-05-31 Osram Sylvania Inc. EMI controlled integral HID reflector lamp

Also Published As

Publication number Publication date
CA2037886A1 (fr) 1991-09-30
DE69123071D1 (de) 1996-12-19
JP2978268B2 (ja) 1999-11-15
EP0449639A3 (en) 1992-05-06
EP0449639B1 (fr) 1996-11-13
JPH04223095A (ja) 1992-08-12

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