EP0474806B1 - Motor vehicle headlight - Google Patents

Motor vehicle headlight Download PDF

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Publication number
EP0474806B1
EP0474806B1 EP91905062A EP91905062A EP0474806B1 EP 0474806 B1 EP0474806 B1 EP 0474806B1 EP 91905062 A EP91905062 A EP 91905062A EP 91905062 A EP91905062 A EP 91905062A EP 0474806 B1 EP0474806 B1 EP 0474806B1
Authority
EP
European Patent Office
Prior art keywords
discharge lamp
gas discharge
lens
headlamp
glass
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.)
Expired - Lifetime
Application number
EP91905062A
Other languages
German (de)
French (fr)
Other versions
EP0474806A1 (en
Inventor
Bodo Remus
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.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0474806A1 publication Critical patent/EP0474806A1/en
Application granted granted Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V25/00—Safety devices structurally associated with lighting devices
    • 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
    • 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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/255—Lenses with a front view of circular or truncated circular outline
    • 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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/28—Cover glass

Definitions

  • the invention relates to a headlight for motor vehicles according to the preamble of claim 1.
  • Such a headlight is known from DE-OS 35 19 611.
  • This headlight has a reflector into which a gas discharge lamp protrudes.
  • the light outlet opening of the headlight is covered with a lens.
  • the gas discharge lamp also emits electromagnetic radiation in the invisible range, which can lead to interference, for example, in radio reception in motor vehicles.
  • gas discharge lamps such as fluorescent tubes
  • the coating can also be designed like a grid.
  • the gas discharge lamps are intended for general lighting purposes, such as room lighting, where it is not necessary that the light emitted by the gas discharge lamp be distributed in a certain way.
  • these gas discharge lamps are not suitable for use in headlights for motor vehicles, since the light emitted by the gas discharge lamp must be distributed in a very specific way in order to comply with legal regulations for the light distribution, so that the light beam emerging from the headlight is influenced by the coating must be avoided.
  • specially designed gas discharge lamps are required for use in headlights for motor vehicles with regard to their operating properties and dimensions.
  • a traffic signal system is known from Patent Abstracts of Japan, Volume 4, No. 14 (E-169), Jan. 31, 1980, JP-A-54-154996, in which a gas discharge lamp is used as a light source.
  • the signaling system has a housing in which a reflector is arranged and the light exit opening of which is covered with a colored lens.
  • a transparent, radiation-absorbing, electrically conductive coating To shield interference radiation emitted by the gas discharge lamp, an additional part is arranged between the gas discharge lamp and the lens, which is provided with a transparent, radiation-absorbing, electrically conductive coating. In the case of the signal system, it is insignificant for its function if the coating exerts an influence on the light emerging from it.
  • the headlamp according to the invention with the features of claims 1 to 3 has the advantage over the headlamp known from document DE-A-35 19 611 that shielding radiation emitted by the gas discharge lamp is shielded.
  • the headlight according to claims 1 and 2 also has the advantage that no additional component is required, since the coating is arranged on the lens or lens present in the headlight.
  • the headlight according to claim 3 also has the advantage that it is ensured by the arrangement of the shielding device in the unsharpness of the beam path that it does not interfere with the light distribution generated by the headlight.
  • FIG. 1 shows a first embodiment of a headlamp in longitudinal section in a greatly simplified representation
  • FIG. 2 shows the headlamp in front view
  • FIG. 3 shows a second embodiment of the headlamp in longitudinal section.
  • FIG. 1 shows a first exemplary embodiment of a headlight for motor vehicles, which has a reflector 10, into which a gas discharge lamp 11 is inserted.
  • the light exit opening of the headlight is covered with a lens 12.
  • the lens 12 is provided with a transparent metallic coating 14 which is grounded and is shielded by the electromagnetic radiation which arises during the discharge process within the glass bulb 13 and which could interfere with fadio waves.
  • FIG. 3 shows a second exemplary embodiment of a headlight based on the projection principle, in which a diaphragm 15, a lens 16 and the lens 12 are arranged in the beam path of the light rays reflected by the reflector 10.
  • the upper edge of the diaphragm 15 is imaged by the lens as the light-dark boundary of the light distribution.
  • the lens 16 is provided with a coating 14 as described in FIG. 1 for shielding the interference radiation, the coating 14 also being grounded.
  • a shielding device 18 can be arranged in the unsharpness area of the beam path between the gas discharge lamp 11 and the lens 16 or between the lens 16 and the lens 12, which is shown in FIG. 2 and consists of a large number of thin metallic wires 19 exists, which are arranged at such a distance from one another transversely to the light exit direction that sufficient light can pass between them.
  • the wires 19 are grounded and can also be arranged in a different pattern, for example like a fence.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

The headlight proposed comprises a reflector (10) in which a discharge lamp (11) is mounted. The light exit aperture of the headlight is covered over by a pane (12). In order to screen the headlight with respect to the interference emitted by the discharge lamp (11), which could perturb radio reception in motor vehicles, the pane (12) has a transparent, interference-absorbing metal coating.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Scheinwerfer für Kraftfahrzeuge nach der Gattung des Anspruchs 1.The invention relates to a headlight for motor vehicles according to the preamble of claim 1.

Ein solcher Scheinwerfer ist durch die DE-OS 35 19 611 bekannt. Dieser Scheinwerfer weist einen Reflektor auf, in den eine Gasentladungslampe hineinragt. Die Lichtaustrittsöffnung des Scheinwerfers ist mit einer Lichtscheibe abgedeckt. Die Gasentladungslampe sendet neben der sichtbaren Strahlung auch elektromagnetische Strahlung im nichtsichtbaren Bereich aus, die beispielsweise beim Rundfunkempfang in Kraftfahrzeugen zu Störungen führen kann.Such a headlight is known from DE-OS 35 19 611. This headlight has a reflector into which a gas discharge lamp protrudes. The light outlet opening of the headlight is covered with a lens. In addition to visible radiation, the gas discharge lamp also emits electromagnetic radiation in the invisible range, which can lead to interference, for example, in radio reception in motor vehicles.

Durch die FR-A-1 072 019 ist es bekannt, bei Gasentladungslampen wie beispielsweise Leuchtstoffröhren eine Umhüllung vorzusehen, die zur Abschirmung von von der Gasentladungslampe ausgesandter Störstrahlung mit einer transparenten, störstrahlungsabsorbierenden metallischen Beschichtung versehen ist. Die Beschichtung kann dabei auch gitterartig ausgebildet sein. Die Gasentladungslampen sind für allgemeine Beleuchtungszwecke wie beispielsweise Raumbeleuchtung vorgesehen, wo es nicht erforderlich ist, daß das von der Gasentladungslampe ausgesandte Licht in einer bestimmten Weise verteilt wird. Für den Einsatz in Scheinwerfern für Kraftfahrzeuge sind diese Gasentladungslampen jedoch nicht geeignet, da dabei das von der Gasentladungslampe ausgesandte Licht in einer ganz bestimmten Weise verteilt werden muß, um gesetzliche Vorschriften für die Lichtverteilung einzuhalten, so daß eine Beeinflußung des aus dem Scheinwerfer austretenden Lichtbündels durch die Beschichtung vermieden werden muß. Außerdem sind für den Einsatz in Scheinwerfern für Kraftfahrzeuge hinsichtlich ihrer Betriebseigenschaften und Abmessungen speziell ausgebildete Gasentladungslampen erforderlich.From FR-A-1 072 019 it is known to provide a covering for gas discharge lamps, such as fluorescent tubes, which is provided with a transparent, radiation-absorbing metallic coating to shield against interference radiation emitted by the gas discharge lamp. The coating can also be designed like a grid. The gas discharge lamps are intended for general lighting purposes, such as room lighting, where it is not necessary that the light emitted by the gas discharge lamp be distributed in a certain way. However, these gas discharge lamps are not suitable for use in headlights for motor vehicles, since the light emitted by the gas discharge lamp must be distributed in a very specific way in order to comply with legal regulations for the light distribution, so that the light beam emerging from the headlight is influenced by the coating must be avoided. In addition, specially designed gas discharge lamps are required for use in headlights for motor vehicles with regard to their operating properties and dimensions.

Durch Patent Abstracts of Japan, Band 4, Nr. 14 (E-169), 31. Jan. 1980, JP-A-54-154996, ist eine Verkehrssignalanlage bekannt, bei der eine Gasentladungslampe als Lichtquelle verwendet wird. Die Signalanlage weist ein Gehäuse auf, in dem ein Reflektor angeordnet ist und dessen Lichtaustrittsöffnung mit einer gefärbten Lichtscheibe abgedeckt ist. Zur Abschirmung von von der Gasentladungslampe ausgesandter Störstrahlung ist zwischen der Gasentladungslampe und der Lichtscheibe ein zusätzliches Teil angeordnet, das mit einer transparenten, störstrahlungsabsorbierenden, elektrisch leitfähigen Beschichtung versehen ist. Bei der Signalanlage ist es dabei für deren Funktion unwesentlich, wenn durch die Beschichtung das aus dieser austretende Licht beeinflußt wird.A traffic signal system is known from Patent Abstracts of Japan, Volume 4, No. 14 (E-169), Jan. 31, 1980, JP-A-54-154996, in which a gas discharge lamp is used as a light source. The signaling system has a housing in which a reflector is arranged and the light exit opening of which is covered with a colored lens. To shield interference radiation emitted by the gas discharge lamp, an additional part is arranged between the gas discharge lamp and the lens, which is provided with a transparent, radiation-absorbing, electrically conductive coating. In the case of the signal system, it is insignificant for its function if the coating exerts an influence on the light emerging from it.

Der erfindungsgemäße Scheinwerfer mit den Merkmalen der Ansprüche 1 bis 3 hat gegenüber dem durch das Dokument DE-A-35 19 611 bekannten Scheinwerfer den Vorteil, daß von der Gasentladungslampe ausgesandte Störstrahlung abgeschirmt ist. Der Scheinwerfer gemäß dem Anspruch 1 und 2 hat darüberhinaus den Vorteil, daß kein zusätzliches Bauteil erforderlich ist, da die Beschichtung auf der beim Scheinwerfer vorhandenen Lichtscheibe oder Linse angeordnet ist. Der Scheinwerfer gemäß dem Anspruch 3 hat außerdem den Vorteil, daß durch die Anordnung der Abschirmvorrichtung im Unschärfebereich des Strahlengangs sichergestellt ist, daß diese nicht in störender Weise die vom Scheinwerfer erzeugte Lichtverteilung beeinflußt.The headlamp according to the invention with the features of claims 1 to 3 has the advantage over the headlamp known from document DE-A-35 19 611 that shielding radiation emitted by the gas discharge lamp is shielded. The headlight according to claims 1 and 2 also has the advantage that no additional component is required, since the coating is arranged on the lens or lens present in the headlight. The headlight according to claim 3 also has the advantage that it is ensured by the arrangement of the shielding device in the unsharpness of the beam path that it does not interfere with the light distribution generated by the headlight.

Zeichnungdrawing

Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein erstes Ausführungsbeispiel eines Scheinwerfers im Längsschnitt in stark vereinfachter Darstellung, Figur 2 den Scheinwerfer in der Vorderansicht und Figur 3 ein zweites Ausführungsbeispiel des Scheinwerfers im Längsschnitt.Two embodiments of the invention are shown in the drawing and explained in more detail in the following description. 1 shows a first embodiment of a headlamp in longitudinal section in a greatly simplified representation, FIG. 2 shows the headlamp in front view and FIG. 3 shows a second embodiment of the headlamp in longitudinal section.

Beschreibungdescription

In Figur 1 ist ein erstes Ausführungsbeispiel eines Scheinwerfers für Kraftfahrzeuge dargestellt, der einen Reflektor 10 aufweist, in den eine Gasentladungslampe 11 eingesetzt ist. Die Lichtaustrittsöffnung des Scheinwerfers ist mit einer Lichtscheibe 12 abgedeckt.FIG. 1 shows a first exemplary embodiment of a headlight for motor vehicles, which has a reflector 10, into which a gas discharge lamp 11 is inserted. The light exit opening of the headlight is covered with a lens 12.

Die Lichtscheibe 12 ist mit einer transparenten metallischen Beschichtung 14 versehen, die geerdet ist und durch die beim Entladungsvorgang innerhalb des Glaskolbens 13 entstehende elektromagnetische Strahlung, die Fadiowellen stören könnte, abgeschirmt ist.The lens 12 is provided with a transparent metallic coating 14 which is grounded and is shielded by the electromagnetic radiation which arises during the discharge process within the glass bulb 13 and which could interfere with fadio waves.

In Figur 3 ist ein zweites Ausführungsbeispiel für einen Scheinwerfer nach dem Projektionsprinzip dargestellt, bei dem im Strahlengang der vom Reflektor 10 reflektierten Lichtstrahlen eine Blende 15, eine Linse 16 sowie die Lichtscheibe 12 angeordnet sind. Durch die Linse wird die Oberkante der Blende 15 als Helldunkelgrenze der Lichtverteilung abgebildet. Die Linse 16 ist mit einer wie zu Figur 1 beschriebenen Beschichtung 14 zur Abschirmung der Störstrahlung versehen, wobei die Beschichtung 14 ebenfalls geerdet ist.FIG. 3 shows a second exemplary embodiment of a headlight based on the projection principle, in which a diaphragm 15, a lens 16 and the lens 12 are arranged in the beam path of the light rays reflected by the reflector 10. The upper edge of the diaphragm 15 is imaged by the lens as the light-dark boundary of the light distribution. The lens 16 is provided with a coating 14 as described in FIG. 1 for shielding the interference radiation, the coating 14 also being grounded.

Alternativ kann bei einer Variante zu diesem Scheinwerfer im Unschärfebereich des Strahlengangs zwischen der Gasentladungslampe 11 und der Linse 16 oder zwischen der Linse 16 und der Lichtscheibe 12 eine Abschirmvorrichtung 18 angeordnet sein, die in Figur 2 dargestellt ist und die aus einer Vielzahl dünner metallischer Drähte 19 besteht, die mit solchem Abstand zueinander quer zur Lichtaustrittsrichtung netzartig angeordnet sind, daß genügend Licht zwischen diesen hindurchtreten kann. Die Drähte 19 sind geerdet und können auch in einem anderen Muster, beispielsweise zaungitterartig angeordnet werden.Alternatively, in a variant of this headlight, a shielding device 18 can be arranged in the unsharpness area of the beam path between the gas discharge lamp 11 and the lens 16 or between the lens 16 and the lens 12, which is shown in FIG. 2 and consists of a large number of thin metallic wires 19 exists, which are arranged at such a distance from one another transversely to the light exit direction that sufficient light can pass between them. The wires 19 are grounded and can also be arranged in a different pattern, for example like a fence.

Claims (3)

  1. Headlamp for motor vehicles with a reflector (10) into which a gas discharge lamp (11) protrudes and with a glass (12) covering the light outlet opening of the headlamp, characterized in that in order to screen interference radiation emitted by the gas discharge lamp (11), the glass (12) is provided with a transparent interference-radiation-absorbing metallic coating (14).
  2. Headlamp for motor vehicles with a reflector (10) into which a gas discharge lamp (11) protrudes and with a glass (12) covering the light outlet opening of the headlamp, characterized in that a lens (16) is arranged in the region between the gas discharge lamp (11) and the glass (12), which lens (16), in order to screen interference radiation emitted by the gas discharge lamp (11), is provided with a transparent interference-radiation-absorbing metallic coating (14).
  3. Headlamp for motor vehicles with a reflector (10) into which a gas discharge lamp (11) protrudes and with a glass (12) covering the light outlet opening of the headlamp, characterized in that a lens (16) is arranged between the gas discharge lamp (11) and the glass (12), by means of which lens (16) one edge of a shutter (15), which is arranged between the lens (16) and the gas discharge lamp (11), is formed as a brightness limit for the light beam emerging from the headlamp, and in that a screening device (18) which consists of thin metallic wires arranged at a distance from one another is arranged in the unfocused region of the beam path between the glass (12) and the gas discharge lamp (11), in order to screen interference radiation emitted by the gas discharge lamp (11).
EP91905062A 1990-04-04 1991-03-16 Motor vehicle headlight Expired - Lifetime EP0474806B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE4010829 1990-04-04
DE4010829 1990-04-04
DE4101722A DE4101722A1 (en) 1990-04-04 1991-01-22 HEADLIGHTS FOR MOTOR VEHICLES
DE4101722 1991-01-22
PCT/DE1991/000229 WO1991015711A1 (en) 1990-04-04 1991-03-16 Motor vehicle headlight

Publications (2)

Publication Number Publication Date
EP0474806A1 EP0474806A1 (en) 1992-03-18
EP0474806B1 true EP0474806B1 (en) 1995-05-31

Family

ID=25891850

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91905062A Expired - Lifetime EP0474806B1 (en) 1990-04-04 1991-03-16 Motor vehicle headlight

Country Status (4)

Country Link
EP (1) EP0474806B1 (en)
JP (1) JPH04506281A (en)
DE (2) DE4101722A1 (en)
WO (1) WO1991015711A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5343370A (en) * 1990-10-23 1994-08-30 Koito Manufacturing Co., Ltd. Motor vehicle headlamp
FR2717982B1 (en) * 1994-03-24 1996-05-15 Valeo Vision Electromagnetic shielding device for lighting and / or vehicle signaling systems of the tube discharge lamp type.
FR2755747B1 (en) * 1996-11-13 1999-01-29 Valeo Vision DISCHARGE LAMP PROJECTOR
DE602004008259T2 (en) * 2003-03-18 2008-05-15 Philips Intellectual Property & Standards Gmbh GAS DISCHARGE LAMP
ATE381112T1 (en) * 2003-03-18 2007-12-15 Koninkl Philips Electronics Nv GAS DISCHARGE LAMP

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1072019A (en) * 1953-01-07 1954-09-07 Improvements to discharge lamps
US3885150A (en) * 1973-12-03 1975-05-20 John Ott Lab Shielded luminaire
DE3519611A1 (en) * 1985-05-31 1986-12-04 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 8000 München MOTOR VEHICLE HEADLAMP UNIT

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, volume 4, No. 14 (E-169), 31 January 1980, & JP-A 54154996 *

Also Published As

Publication number Publication date
WO1991015711A1 (en) 1991-10-17
DE4101722A1 (en) 1991-10-10
JPH04506281A (en) 1992-10-29
DE59105614D1 (en) 1995-07-06
EP0474806A1 (en) 1992-03-18

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