EP0324652A1 - Projecteur de véhicule avec position de rayons contrôlée - Google Patents

Projecteur de véhicule avec position de rayons contrôlée Download PDF

Info

Publication number
EP0324652A1
EP0324652A1 EP89300340A EP89300340A EP0324652A1 EP 0324652 A1 EP0324652 A1 EP 0324652A1 EP 89300340 A EP89300340 A EP 89300340A EP 89300340 A EP89300340 A EP 89300340A EP 0324652 A1 EP0324652 A1 EP 0324652A1
Authority
EP
European Patent Office
Prior art keywords
arc
magnetic field
reflector
lamp
vehicle headlamp
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.)
Withdrawn
Application number
EP89300340A
Other languages
German (de)
English (en)
Inventor
Harold L. Jr. Intellectual Dept. Rothwell
George J. Intellectual Prop. Dept. English
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 Sylvania Inc
Original Assignee
GTE Products Corp
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 GTE Products Corp filed Critical GTE Products Corp
Publication of EP0324652A1 publication Critical patent/EP0324652A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/17—Discharge light sources
    • F21S41/172—High-intensity discharge light sources
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/56—One or more circuit elements structurally associated with the lamp

Definitions

  • This invention relates to vehicle headlamps utilizing high intensity arc discharge lamps and, more particularly, to a vehicle headlamp wherein the beam position is controlled by a magnetic or an electric field applied to the arc.
  • High intensity arc discharge lamps such as metal halide lamps, mercury vapor lamps and high pressure sodium lamps, are widely used for general lighting purposes, but are also utilized in numerous applications wherein the light output from the lamp passes through an optical system and forms a light beam. Examples of such systems include projection systems, vehicle headlamps, spotlights and the like. In many of those applications, it is desirable to control the light intensity, the focus or the beam direction. For example, in projection systems, it is often desirable to vary the light intensity, and in vehicle headlamps, it is necessary to provide high and low beam positions.
  • Arc discharge lamps include a sealed arc tube, a pair of spaced-apart electrodes within the arc tube and a fill material that produces a luminous arc discharge when suitably energized. In operation, an arc discharge,consisting of a plasma of charged particles and carrying an arc current, is sustained between the electrodes. Some lamp types are designed for operation with an a.c. power source while others are designed for operation with a d.c. power source.
  • dimning of optical systems utilizing metal halide lamps is normally accomplished by mechanical devices such as irises, shutters, devices for moving the lamp with respect to a focal point, etc. Such mechanical devices are relatively slow and unreliable.
  • high and low beam positions are normally provided by separate lamps, one for a high position and one for a low position, or by a single lamp assembly with two filaments, one for high beam and one for low beam. In either case, the cost is increased by the necessity for separate high and low beam elements.
  • arc discharge lamps in vehicle headlamps because they have a longer operating life than tungsten filament headlamps and do not include a filament that is subject to breakage resulting from shock.
  • a vehicle headlamp comprising an arc lamp for producing a high intensity arc between a pair of electrodes, the arc in normal use having a horizontal orientation, optical means positioned to direct a portion of the light from the arc lamp for forming a light beam, magnetic means for producing a magnetic field in the region of the arc, the magnetic field having at least a component that is horizontal and perpendicular to the arc and means for controlling the magnetic field so that a portion of the arc is deflected upwardly or downwardly by the magnetic field, whereby the light beam is deflected upwardly or downwardly.
  • the optical means comprises a reflector, and the arc lamp is located at or near the focal point of the reflector.
  • the control means can be utilized for switching the magnetic field so as to switch the light beam between the high and low beam positions.
  • the control means can include means for continuously varying the magnetic field so as to raise or lower the light beam.
  • the magnetic field that controls the beam direction can be controlled by a hand switch, a foot switch or a photocell for sensing oncoming vehicle headlamps.
  • the magnetic field can also be controlled in response to the output of a level sensor mounted on the vehicle so that the beam direction is varied as the vehicle goes up or down hills or tips when rounding corners.
  • the magnetic means can include a conductive coil positioned adjacent to the arc and means for supplying an electrical current through the coil.
  • the arc lamp can be positioned at the focal point of the reflector and oriented perpendicular to the reflector axis. In this case, the coil is positioned to generate a magnetic field parallel to the reflector axis.
  • the arc lamp can be positioned at the focal point of the reflector and oriented parallel to the reflector axis. In this case, the coil is positioned to generate a magnetic field perpendicular to the reflector axis.
  • the magnetic means When the arc lamp is energized by an a.c. power source of a predetermined frequency, the magnetic means includes means for producing an a.c. magnetic field of the same predetermined frequency, and the magnetic field and the a.c. power source have a fixed phase relationship. When the arc lamp is energized by a d.c. power source, the magnetic means includes means for producing a d.c. magnetic field.
  • a vehicle headlamp includes an arc lamp, optical means for directing light from the arc lamp and forming a light beam, and means for producing an electromagnetic field for deflection of the arc from its normal path so as to deflect the light beam.
  • the electromagnetic field can be a magnetic field as described above or an electric field, typically produced between deflection plates positioned on opposite sides of the arc.
  • a high intensity arc discharge lamp is controlled by the application of a magnetic field to the arc within the arc discharge lamp.
  • a magnetic field By varying the magnetic field in a controlled manner, the position of the arc within the arc lamp is controlled.
  • Control of an arc with a magnetic field is described with reference to FIGS. 1A-1D.
  • a luminous arc discharge is formed between a pair of electrodes 10 and 12. It will be understood that the arc is formed within an arc tube containing a fill material which ionizes to form an arc discharge upon application of a suitable operating voltage.
  • a magnetic field can be used to control the position of an arc in a metal halide lamp, a mercury vapor lamp, a high pressure sodium lamp or any other arc discharge lamp in which a well-defined arc is formed between a pair of electrodes.
  • the details of the arc lamp construction are omitted for simplicity, since they are well-known in the art and form no part of the present invention.
  • FIG. 1A An arc 14 with no applied magnetic field is illustrated in FIG. 1A.
  • An arc axis 16 is defined as a straight line between electrodes 10 and 12.
  • the arc 14 arches upwardly as a result of convection currents within the arc tube.
  • a magnetic field B is applied to the arc 14, causing it to be deflected from the position shown in FIG. 1A.
  • the arc 14 consists of a plasma of charged particles and has an associated current, i, between electrodes 10 and 12.
  • the magnetic field B interacts with the current ii to produce a force F B on the charges in the arc 14.
  • the resulting force F B is perpendicular to the direction of the current, i, and to the magnetic field B.
  • the magnetic field can have any desired direction, but must have at least a component perpendicular to the arc 14, since the perpendicular component determines the force, F B , on arc 14.
  • the magnetic field must be disposed in the region of the arc 14 so that it interacts with the moving charged particles in the arc.
  • the arc 14 is deflected downwardly to coincide with arc axis 16.
  • the magnitude of the magnetic field is increased so that the arc 14 is deflected below arc axis 16. It will be understood that the ends of the arc 14 which terminate on electrodes 10 and 12 are not deflected by the magnetic field. The portion of the arc 14 between its ends is the part that is deflected.
  • the applied magnetic field, B has been illustrated in FIGS. 1B and 1C as opposing the upward curvature of the arc due to convection currents, it will be understood that the arc tube can have any desired orientation and that the applied magnetic field can likewise have any desired orientation relative to the arc, provided that the magnetic field has at least a component perpendicular to the arc 14.
  • the deflection of the arc 14 from its normal position is controlled in a manner described more fully hereinafter.
  • the magnetic field and the arc current In order for the magnetic field to produce a fixed deflection of the arc in an arc lamp, it is necessary for the magnetic field and the arc current to have a fixed, instantaneous directional relationship. This is easily accomplished in the case of a d.c. lamp where both the arc current direction and the magnetic field direction remain fixed, except when movement of the arc is desired.
  • the current direction In the case of an a.c. arc lamp, the current direction is continuously varying, and it is necessary to apply a magnetic field having the same frequency and a fixed phase relative to the arc current.
  • the magnetic field and arc current track each other to produce a fixed deflection. When this relationship is not maintained, then an effective spreading of the beam is produced.
  • the arc current In an arc lamp which operates from a d.c. power source, the arc current, i, has a constant magnitude and direction.
  • the application of a d.c. magnetic field causes a fixed deflection of the arc 14.
  • the direction of the deflection is perpendicular to the directions of the arc current and the applied magnetic field.
  • the magnitude of the deflection is a function of the magnitude of the applied magnetic field.
  • the arc current varies in a sinusoidal manner, and, a d.c. magnetic field causes a sinusoidally varying force to be applied to the arc.
  • the effect is that the arc rapidly oscillates and appears to the human eye to be widened or spread out.
  • it is necessary to apply a magnetic field that has the same time variation as the arc current. For example, when the arc current varies sinusoidally, a magnetic field having the same frequency as the arc current and locked in phase to the arc current produces a deflection of constant direction and magnitude.
  • the arc deflection can be varied by changing the magnitude of the a.c. magnetic field while maintaining the same frequency and a fixed phase relative to the arc current.
  • the direction of the arc deflection can be reversed by reversing the phase of the magnetic field relative to the arc current.
  • the spreading of the arc 14 can be accomplished as shown in FIG. 1D by applying an a.c. magnetic field to an arc having a d.c. current, or by applying a d.c. magnetic field to an arc having an a.c. current.
  • an a.c. arc can be spread by an a.c. magnetic field having a frequency that is different from the frequency of the arc current.
  • the resulting force on the beam is time varying and causes a time varying arc deflection which appears as an arc spreading.
  • FIG. 2 An optical system utilizing an arc lamp having a magnetically-deflected arc is illustrated in FIG. 2.
  • An arc lamp 20, such as a metal halide arc lamp, is oriented with its arc axis 22 horizontal.
  • the arc.lamp 20 can be a metal halide lamp.
  • the power source for arc lamp 20 is omitted from FIG. 2 for simplicity, since arc lamp power sources are well-known in the art.
  • An image of an arc 21 in arc lamp 20 is focused by a lens 24 on an aperture plate 26 having an aperture 28.
  • the system of FIG. 2 can be a projection system in which a projection lens 29 projects an image of aperture 28 so that a beam pattern 30 is formed on a projection screen (not shown).
  • An optical axis 34 passes through arc 21, lens 24, aperture 28 and projection lens 29.
  • a magnetic apparatus 32 generates a magnetic field parallel to optical axis 34.
  • the magnetic field causes the arc 21 to be deflected upwardly or downwardly in a direction perpendicular to optical axis 34.
  • the image of arc 21 is deflected relative to aperture 28, causing the intensity of beam pattern 30 to vary.
  • the arc lamp 20 is energized by a 60 Hz a.c. power source.
  • the magnetic apparatus 32 includes an electrically-conductive coil 40 oriented in a plane perpendicular to optical axis 34 and positioned in close proximity to arc 21.
  • the coil 40 includes multiple turns of an electrical conductor coupled through a transformer 42 to a control unit 44.
  • the control unit 44 receives 60 Hz a.c. power and supplies to coil 40 a current that is controlled by a control signal.
  • the magnitude of the magnetic field generated by coil 40 is a function of the a.c. current supplied through it. Accordingly, the control signal directly controls the position of the arc 21 and the intensity of the beam pattern 30.
  • the control unit 44 can be a variable transformer or any other suitable device for controlling the current supplied to coil 40.
  • FIG. 3 Another optical system utilizing an arc lamp having an arc that is controllably deflected by a magnetic field is illustrated in FIG. 3.
  • An arc lamp 50 is oriented so that its arc axis coincides with an optical axis 52.
  • the arc lamp 50 is positioned so that an arc 54 within arc lamp 50 is at the focal point of a reflector 56, typically an eliptical reflector.
  • the reflector 56 reflects a portion of the light from lamp 50 so as to form a light beam 58 in the direction of optical axis 52.
  • Light beam 58 illuminates an aperture plate 60 having an aperture 62.
  • a portion of light beam 58 passes through aperture 62 and is focused by a projection lens 64.
  • the focused light beam can be used for projection.
  • a magnetic apparatus 68 which generates a magnetic field perpendicular to optical axis 52, includes an electrically conductive coil 70 positioned adjacent to arc 54.
  • the plane of coil 70 is perpendicular to optical axis 52.
  • Coil 70 includes multiple turns of an electrical conductor and is coupled through a transformer 72 to a control unit 74.
  • the control unit 74 receives a.c. power from a suitable source and supplies current to coil 70 under control of a control signal.
  • the current supplied to coil 70 causes generation in the region of arc 54 of a magnetic field which causes arc 54 to be deflected relative to the focal point of reflector 56.
  • the deflection of arc 54 causes beam 58 to change direction and to be shifted relative to aperture 62.
  • the intensity of beam pattern 64 is varied as a function of the magnetic field applied to arc 54.
  • FIGS. 4-6 A vehicle headlamp incorporating a high intensity arc discharge lamp and means for deflection of the arc with a controllable magnetic field is shown in FIGS. 4-6.
  • An arc lamp 80 is positioned at a focal point 83 of a reflector 84.
  • the arc lamp 80 is positioned such that during normal use an arc 86 within lamp 80 is horizontal and is perpendicular to an axis 82 of reflector 84.
  • a headlamp lens 88 is positioned in front of reflector 84 on axis 82.
  • the reflector 84 is a parabolic reflector, the combination of arc lamp 80, reflector 84 and lens 88 produce a substantially collimated light beam 90 that is suitable for illuminating the way in front of a vehicle.
  • a coil 92 is mounted within reflector 84 in close proximity to arc lamp 80.
  • the coil 92 comprises multiple turns of an electrical conductor oriented to produce a magnetic field parallel to axis 82 and passing through arc lamp 80.
  • the coil 92 is supplied through a transformer 94 with a.c. current from a control unit 96.
  • the a.c. current supplied to coil 92 should be of the same frequency and fixed in phase relative to the arc current in lamp 80.
  • the arc 86 is deflected upwardly or downwardly relative to focal point 83 and causes beam 90 direction to be raised or lowered as described hereinafter.
  • the control unit 96 receives a.c. power from a suitable power source, usually a d.c.-to-a.c. converter in a vehicle, and controls the current through coil 92 in response to a control input from a sensor or a switch 98.
  • a suitable power source usually a d.c.-to-a.c. converter in a vehicle
  • the arc lamp 80 is an oval shaped 45 watt metal halide arc lamp. This lamp has an overall length of about four centimeters, an arc length of about five millimeters and requires 90 volts a.c. and 0.5 amperes for operation.
  • a preferred coil 92 utilizes approximately 30 turns of 24 gauge .022 inch(0.56mm) diameter enamel wire, wound around an insulating sleeve 99. With reference to FIG. 6, lamp leads 80a and 80b and coil leads 92a and 92b pass through sleeve 99 and reflector 84, and are connected to suitable power sources.
  • FIGS. 7A and 7B Operation of the vehicle headlamp shown in FIGS. 4-6 to produce high and low beams is illustrated with reference to FIGS. 7A and 7B.
  • arc 86 is located on axis 82 at focal point 83, and light beam 90 is directed by reflector 84 parallel to axis 82.
  • the arc 86 is maintained at focal point 83 by a magnetic field, B, supplied from coil 92.
  • B supplied from coil 92.
  • the arc 86 is displaced upwardly relative to focal point 83.
  • the upward displacement results from the removal, or turning off, of the applied magnetic field.
  • the light beam 90 is now directed by reflector 84 at a downward angle relative to axis 82.
  • the magnetic fields selected for producing high and low positions are a matter of design choice.
  • an applied magnetic field can position arc 86 above focal point 83, as shown in FIG. 7B, while the removal of the magnetic field can position the arc 86 at the focal point 83, as illustrated in FIG. 7A.
  • the high and low positions can be established by two different magnetic field magnitudes rather than on and off conditions.
  • the vehicle headlamp disclosed herein is not limited to high and low beam positions. Instead, the angle between light beam 90 and axis 82 can be varied continuously between upper and lower limits, depending on the desired operation.
  • the beam 90 is controlled between high and low beam positions by a hand switch, a foot switch or a photocell for sensing oncoming vehicle headlamps.
  • the direction of light beam 90 is controlled by a level sensor mounted on the vehicle. The level sensor provides an out-of-level indicator signal when the vehicle goes up or down hills, or tips from side to side when rounding a corner. The level indicator signal can be provided to the control unit 96 so as to adjust the direction of the light beam 90 as desired. It will be understood that any other desired sensor, switch or control device can be utilized to control the direction of light beam 90.
  • the reflector 84 is not necessarily parabolic, but can be elliptical, spherical or any other suitable shape.
  • an arc lamp 91 can be oriented so that the arc axis coincides with an axis 93 of a reflector 95.
  • the coil is positioned either to the left or to the right of arc lamp 91 in order to obtain a magnetic field perpendicular to axis 93 and an arc deflection in the upward or downward direction.
  • two (or more than two) coils 100, 101 can be used for deflection of the arc. As shown in FIG. 8, the coils 100 and 101 are positioned on opposite sides of arc lamp 91.
  • the coils 100, 101 are rectangular or otherwise shaped to minimize blockage of the light path between the arc lamp 91 and the reflector 95.
  • the same or separate power sources can be utilized to energize coils 100, 101.
  • the above-described relationships between the arc current and the magnetic field must be maintained.
  • the size and shape of the reflector are selected to complement the size, shape and orientation of the arc lamp.
  • a magnetically-controlled arc lamp can be utilized to focus or defocus a light beam, as illustrated in FIG. 9.
  • An arc lamp 102 is positioned on an axis 104 at the focal point 106 of a reflector 108.
  • An arc 110 within arc lamp 102 is oriented perpendicular to axis 104. With no applied magnetic field, the arc 110 is relatively small and compact and produces a focused light beam 112.
  • a magnetic field is applied to the arc 110, as shown in FIG. lD and described hereinabove. In order to spread the beam rather than deflect it in a fixed direction, the magnetic field must be time varying in relation to the arc current. When a d.c.
  • the magnetic field is a.c. and, conversely, when an a.c. arc lamp is utilized, the magnetic field is d.c. or a.c. of a different frequency from the arc current.
  • the required magnetic field is provided by a coil 114 which is positioned on the axis 104 so as to produce a magnetic field along axis 104 through arc 110.
  • the magnetic field causes a spreading of the arc as indicated at 116, and a defocused, spread-out light beam 118 is produced.
  • Arc deflection has been described thus far in connection with the force applied by a magnetic field to the moving charged particles in the arc. Arc deflection can also be accomplished by an applied electric field as shown in FIG. 10.
  • An arc 130 is formed between a pair of electrodes 132, 134.
  • An electric field E having at least a component perpendicular to arc 130, is applied in the region of the arc 130 by deflection plates 136 and 138 positioned on opposite sides of arc 130. When a voltage is applied between plates 136 and 138, the electric field E is produced in the region between them.
  • the deflection plates 136, 138 can have any convenient size or shape for producing the desired electric field E in the region of arc 130.
  • the electric field E deflects the arc 130 in the same manner as an applied magnetic field, except that the force in arc 130 is parallel to the electric field E, whereas the force is perpendicular to an applied magnetic field B.
  • the arc deflection arrangement shown in FIG. 10 can be utilized in the optical systems shown in FIGS. 2-9 and described hereinabove.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP89300340A 1988-01-14 1989-01-13 Projecteur de véhicule avec position de rayons contrôlée Withdrawn EP0324652A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14482888A 1988-01-14 1988-01-14
US144828 1988-01-14

Publications (1)

Publication Number Publication Date
EP0324652A1 true EP0324652A1 (fr) 1989-07-19

Family

ID=22510330

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89300340A Withdrawn EP0324652A1 (fr) 1988-01-14 1989-01-13 Projecteur de véhicule avec position de rayons contrôlée

Country Status (2)

Country Link
EP (1) EP0324652A1 (fr)
JP (1) JPH01215639A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0636865A2 (fr) * 1993-07-28 1995-02-01 Jasco Corporation Unité d'éclairage et analyseur optique l'utilisant
EP0940841A2 (fr) * 1998-03-06 1999-09-08 Osram Sylvania Inc. Lampe HID à courant alternatif à déflection magnétique
DE19845016A1 (de) * 1998-09-30 2000-04-06 Volkswagen Ag Gasentladungslampe, insbesondere für Kraftfahrzeugscheinwerfer, sowie Verfahren zum Betrieb derselben
EP0942454A3 (fr) * 1998-03-13 2000-06-28 Osram Sylvania Inc. Lampe horizontale avec déflection magnétique pour véhicule
EP1111653A1 (fr) * 1999-12-22 2001-06-27 Matsushita Electric Industrial Co., Ltd. Lampe à décharge de grande puissance, appareil de commande pour une telle lampe et dispositif d'éclairage équipé d'une telle lampe
EP1282151A2 (fr) * 2001-08-02 2003-02-05 Philips Corporate Intellectual Property GmbH Lampe à décharge et phare pour véhicule automobile
US6608444B2 (en) 2000-05-26 2003-08-19 Matsushita Electric Industrial Co., Ltd. Mercury-free high-intensity discharge lamp operating apparatus and mercury-free metal halide lamp

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3311745A (en) * 1964-03-19 1967-03-28 Gossner Elwin Controlled beam headlamp and the like
US3988626A (en) * 1975-05-12 1976-10-26 Eprad Incorporated Magnetically stabilized xenon arc lamp
US4514662A (en) * 1979-06-04 1985-04-30 Skeist S Merrill Magnetic arc spreading fluorescent lamps
FR2616589A1 (fr) * 1987-06-12 1988-12-16 Cibie Projecteurs Lampe a decharge a deux arcs commutables pour projecteur de vehicule automobile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3311745A (en) * 1964-03-19 1967-03-28 Gossner Elwin Controlled beam headlamp and the like
US3988626A (en) * 1975-05-12 1976-10-26 Eprad Incorporated Magnetically stabilized xenon arc lamp
US4514662A (en) * 1979-06-04 1985-04-30 Skeist S Merrill Magnetic arc spreading fluorescent lamps
FR2616589A1 (fr) * 1987-06-12 1988-12-16 Cibie Projecteurs Lampe a decharge a deux arcs commutables pour projecteur de vehicule automobile

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0636865A2 (fr) * 1993-07-28 1995-02-01 Jasco Corporation Unité d'éclairage et analyseur optique l'utilisant
EP0636865A3 (fr) * 1993-07-28 1995-05-17 Jasco Corp Unité d'éclairage et analyseur optique l'utilisant.
US5568007A (en) * 1993-07-28 1996-10-22 Jasco Corporation Lamp unit and optical analyzer using the same
EP0940841A2 (fr) * 1998-03-06 1999-09-08 Osram Sylvania Inc. Lampe HID à courant alternatif à déflection magnétique
EP0940841A3 (fr) * 1998-03-06 1999-10-06 Osram Sylvania Inc. Lampe HID à courant alternatif à déflection magnétique
EP0942454A3 (fr) * 1998-03-13 2000-06-28 Osram Sylvania Inc. Lampe horizontale avec déflection magnétique pour véhicule
DE19845016A1 (de) * 1998-09-30 2000-04-06 Volkswagen Ag Gasentladungslampe, insbesondere für Kraftfahrzeugscheinwerfer, sowie Verfahren zum Betrieb derselben
EP1111653A1 (fr) * 1999-12-22 2001-06-27 Matsushita Electric Industrial Co., Ltd. Lampe à décharge de grande puissance, appareil de commande pour une telle lampe et dispositif d'éclairage équipé d'une telle lampe
US6608444B2 (en) 2000-05-26 2003-08-19 Matsushita Electric Industrial Co., Ltd. Mercury-free high-intensity discharge lamp operating apparatus and mercury-free metal halide lamp
EP1282151A2 (fr) * 2001-08-02 2003-02-05 Philips Corporate Intellectual Property GmbH Lampe à décharge et phare pour véhicule automobile
EP1282151A3 (fr) * 2001-08-02 2006-01-04 Philips Intellectual Property & Standards GmbH Lampe à décharge et phare pour véhicule automobile

Also Published As

Publication number Publication date
JPH01215639A (ja) 1989-08-29

Similar Documents

Publication Publication Date Title
US6043614A (en) Alternating current hid lamp with magnetic deflection
US7122960B2 (en) Emission device for an ultra-high pressure mercury lamp
JP4531264B2 (ja) ランプ作動制御装置および方法
KR940009326B1 (ko) 단방향 전류에 의한 크세논 금속 할로겐 램프의 음향 공명 동작 방법
US6552499B2 (en) High-pressure gas discharge lamp, and method of manufacturing same
EP0324651A1 (fr) Source lumineuses de décharge à haute intensité utilisant un champ magnétique ou électrique pour la commande de la position d'arc
US4868458A (en) Xenon lamp particularly suited for automotive applications
US5997162A (en) Horizontal HID vehicle headlamp with magnetic deflection
EP0324652A1 (fr) Projecteur de véhicule avec position de rayons contrôlée
KR970009072B1 (ko) 크세논-금속 할로겐 램프의 음향 공진 작동방법 및 그 회로
TWI228580B (en) Discharge lamp and headlight for a motor vehicle
US6479950B2 (en) High intensity discharge lamp, driving apparatus for high intensity discharge lamp, and high intensity discharge lamp system
JP2588978B2 (ja) アークランブにおけるアークの安定化方法および安定化されたアークランプ
US6175199B1 (en) Magnetically deflected arc lamp
JP2009026747A (ja) プロジェクタ
JP3408519B2 (ja) 高輝度放電ランプ、高輝度放電ランプの駆動装置、およびこれらを用いた高輝度放電ランプ装置
JP3189602B2 (ja) 放電ランプ点灯装置
US20020122310A1 (en) High intensity discharge lamp
US8264164B2 (en) Method of driving discharge lamp, driving device, and projector
JPH04289695A (ja) 照明装置
JPH02304897A (ja) 照明装置
JPH0596988A (ja) 放電灯点灯装置
JP2000012251A (ja) 放電灯装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE FR GB NL SE

17P Request for examination filed

Effective date: 19900117

17Q First examination report despatched

Effective date: 19920709

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19920801