EP0487679B1 - Vehicle headlight - Google Patents

Vehicle headlight Download PDF

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Publication number
EP0487679B1
EP0487679B1 EP91911253A EP91911253A EP0487679B1 EP 0487679 B1 EP0487679 B1 EP 0487679B1 EP 91911253 A EP91911253 A EP 91911253A EP 91911253 A EP91911253 A EP 91911253A EP 0487679 B1 EP0487679 B1 EP 0487679B1
Authority
EP
European Patent Office
Prior art keywords
light
lens
headlamp according
filter
discharge lamp
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
EP91911253A
Other languages
German (de)
French (fr)
Other versions
EP0487679A1 (en
Inventor
Bodo Remus
Dieter Sieber
Jürgen Stein
Günter HEGE
Tilman Spingler
Friedrich Schmied
Peter Kusserow
Hans-Jürgen Schneider
Christian JÄGER
Bernhard Wörner
Fred Delb
Thomas Weigold
Kay Kolberg
Karl-Heinrich Preis
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
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0487679A1 publication Critical patent/EP0487679A1/en
Application granted granted Critical
Publication of EP0487679B1 publication Critical patent/EP0487679B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F21V25/02—Safety devices structurally associated with lighting devices coming into action when lighting device is disturbed, dismounted, or broken
    • F21V25/04—Safety devices structurally associated with lighting devices coming into action when lighting device is disturbed, dismounted, or broken breaking the electric circuit
    • 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
    • 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
    • F21S41/29—Attachment thereof
    • F21S41/295—Attachment thereof specially adapted to projection lenses
    • 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
    • F21S41/50—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by aesthetic components not otherwise provided for, e.g. decorative trim, partition walls or covers
    • F21S41/55—Attachment thereof
    • 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
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/06—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for filtering out ultraviolet radiation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/30—Ventilation or drainage of lighting devices
    • F21S45/33—Ventilation or drainage of lighting devices specially adapted for headlamps

Definitions

  • the invention relates to a headlight for motor vehicles according to the preamble of claim 1.
  • Such a headlight is known from DE-A-2 155 378.
  • This headlamp has a reflector, a gas discharge lamp and a lens covering the light outlet opening of the headlamp.
  • a disk-shaped filter is arranged in the beam path of the light beams reflected by the reflector and those emitted directly from the gas discharge lamp to the lens, which filter at least partially absorbs light in the UV wavelength range.
  • the lens serves as a filter.
  • a disadvantage of this headlamp is that, for example in the event of an accident damaged filter, i.e. damaged lens, UV light can escape from the headlamp during operation of the gas discharge lamp, which on the one hand causes a health hazard for people staying directly in front of the headlamp and on the other hand a Damage to plastic components of the headlight is possible.
  • GB-A-1 364 927 also discloses a headlight in which a disk-shaped filter is provided, by means of which UV light emitted by the light source of the headlight is at least partially absorbed.
  • the lens of the headlight or a separate part inserted into the headlight can serve as a filter.
  • the lens or the separate filter can be provided with a metal coating made of chrome.
  • the headlight according to the invention with the features of claim 1 has the advantage that operation of the gas discharge lamp is prevented when the UV filter is damaged, so that it is ensured that no harmful UV light can escape from the headlight even under these circumstances.
  • FIG. 1 shows a headlamp in a greatly simplified illustration in a longitudinal section
  • FIG. 2 shows the headlamp in a detailed illustration
  • FIG. 3 shows a detail shown in FIG. 2 with a perspective illustration.
  • a low beam headlight for motor vehicles shown in FIG. 1 it has a reflector 10, in the back of which a gas discharge lamp 11 is inserted. Ellipses result in the vertical and horizontal meridian section of the reflector 10, the axial arc 12 of the gas discharge lamp 11 being arranged in the region of the inner focal point Fe of the ellipses on the optical axis 13 of the reflector. In the direction of the light rays reflected by the reflector 10, an aperture 14 with an optically effective upper edge 15 is arranged below the optical axis 13 in the area of the outer focus Fe 'of the ellipses.
  • a lens 17 and a light disk 18 covering the light outlet opening of the headlight are arranged in the light exit direction, which can be designed as a diffusing screen.
  • the light beams represent the upper edge 15 of the diaphragm 14 via the lens 17 as the light-dark boundary of the light distribution of the headlight.
  • the gas discharge lamp 11 is supplied with the high voltage required for its operation by an ignition device 20 which is fed by the electrical system of the motor vehicle and controlled by a control device 19. In addition to visible light, the gas discharge lamp 11 also emits light in the UV wavelength range with high intensity during its operation.
  • the lens 17 serves as a UV filter and is provided with a coating 23 which absorbs UV light.
  • the coating 23 can be formed by a thin metal layer, for example made of gold or chrome. However, the coating 23 can also be formed by a fluoride layer.
  • the lens 17 can also be given UV-light-absorbing properties by a suitable glass material or by admixtures to the glass material.
  • a disk-shaped UV filter 22 can be arranged between the gas discharge lamp 11 and the lens 18, or the lens 18 can serve as a UV filter by means of a coating 23 or a suitable glass material.
  • the coating 23 of the lens 18 not only shields the UV radiation, this also represents a compensation for the glass optics shown in the lens 18, so that undesired scattering of the light rays passing through is reduced.
  • the coating 23 heats up due to the absorbed UV radiation, which leads to a heating of the lens 18. Heating of the lens 18 to accelerate the drying and defrosting of the lens without the use of external energy is thus achieved.
  • the lens 18 can also be used even by appropriate selection of the glass material or by appropriate additions to the glass material have the property of absorbing UV light. A brownish coloring of the coating 23 or the lens 18 can give the light emerging from the headlight a coloring, so that it looks 'warmer'.
  • the coating 23 or the lens 18 can be designed so that blue light is partially absorbed so that the light emerging from the headlight appears less blue.
  • the coloring of the coating 23 or the lens 18 likewise heats the lens 18 when the gas discharge lamp 11 is in operation.
  • a disc-shaped filter 22 is shown between the gas discharge lamp 11 and the lens 18, which is shown with a broken line in FIG a glass material has the property of absorbing UV light.
  • the gas discharge lamp 11 is inserted into the reflector 10 via a lamp holder 26 and covered on its rear side with a cap 27.
  • a carrier 28 is connected to the front edge of the reflector 10 and extends in the direction of light exit and has a holder 29 for receiving the lens 17 at its end pointing away from the reflector 10.
  • the carrier 28 is designed as a hollow cylinder closed on its circumference and consists of sheet metal.
  • the reflector 10 forms a tight bond with the support 28 and the lens 17, so that neither through these parts nor between them of the headlight covering lens 18 is arranged, which can be designed as a lens.
  • the light beams represent the upper edge 15 of the diaphragm 14 via the lens 17 as the light-dark boundary of the light distribution of the headlight.
  • the lens 17 serves as a UV filter and is provided with a coating 23 which absorbs UV light.
  • the coating 23 can be designed as described in the first exemplary embodiment.
  • the lens 17 can also be given UV-light-absorbing properties by a suitable glass material or by admixtures to the glass material.
  • a disk-shaped UV filter 22 can be arranged between the gas discharge lamp 11 and the lens 18, or the lens 18 can serve as a UV filter by means of a coating 23 or a suitable glass material.
  • FIGS. 3 and 4 show a third exemplary embodiment of the headlight, in which, as in the second exemplary embodiment, the objective 17 serves as a UV filter and has the property of absorbing UV light by means of a coating or a suitable glass material or additions to the glass material.
  • the gas discharge lamp 11 is inserted into the reflector 10 via a lamp holder 26 and covered on its rear side with a cap 27.
  • a carrier 28 is connected to the front edge of the reflector 10 and extends in the direction of light exit and has a holder 29 for receiving the lens 17 at its end pointing away from the reflector 10.
  • the carrier 28 is designed as a hollow cylinder closed on its circumference and consists of sheet metal.
  • the reflector 10 forms a tight bond with the support 28 and the lens 17, so that neither through these parts nor between them UV radiation can escape.
  • a frame 31 is arranged toward the lens 18 and has an opening 32 the size of the objective 17 for the passage of light.
  • the lens 17 can be inserted into the carrier 28 from its end facing the reflector 10 and comes to rest against a radially inwardly facing edge 33 of the carrier 28 forming part of the holder 29, against which it is held by a spring ring 30 becomes.
  • the spring ring 30 is open in its lower area.
  • a stop 36 which here is a rivet, between which and the edge 33 the edge of the objective 17 and the spring ring 30 come to rest when the objective is assembled.
  • a ceramic plate 34 preferably diametrically opposite, can be fastened to the carrier 28, which projects radially inward through the open area of the spring ring 30 when the lens 17 is mounted and overlaps the edge of the lens 17 to the side of the reflector 10. The ceramic plate 34 could also serve to fix the position of the objective 17 at this point if the spring ring 30 is dispensed with.
  • An electrical conductor track 37 is vapor-deposited on the ceramic plate 34 and is connected via signal lines 38 to the electrical control device 19 which controls the ignition device 20.
  • the ceramic plate 34 has a predetermined breaking point determined by a notch 39, the conductor track 37 on the ceramic plate 34 extending beyond the notch 39.
  • the notch 39 is arranged in such a way that when a force of a certain size acts on the lens 17 in the direction of the reflector 10, the ceramic plate 34 is broken by the lens 17 moving as a result of the counter-holder 36 in its lower region from the holder 29, thereby the conductor track 37 is interrupted.
  • the ceramic plate 34 can be arranged at a small distance from the lens so that it does not vibrate during operation Exposed to the lens, which could lead to an unwanted break. An interruption of the conductor track 37 is recognized by a safety circuit of the control device 19 and the operation of the gas discharge lamp 11 is prevented. This ensures that, for example in the event of a lens 17 damaged as a result of an accident, no UV radiation emerges from the headlight and no parts under high voltage can be touched. However, if only the lens 18 is destroyed and the lens 17 is still in its holder 29, the headlight can continue to be operated since the combination of the parts reflector, support and lens is still intact and no harmful UV radiation can escape.
  • the frame 28, the ceramic plate 34 and their electrical connections are covered by the frame 31.
  • a voltage divider circuit can be applied to the ceramic plate 34, which has two resistors R1 and R2, across which a defined voltage drop occurs. Due to the predetermined breaking, one of the lines of the voltage divider is interrupted, so that the voltage drop in relation to the other branch of the voltage divider circuit changes significantly and the fault is thus indicated. If a voltage drop that deviates from the predetermined voltage drop occurs, this is recognized by the safety circuit of the control device 19 and the operation of the gas discharge lamp 11 is prevented. It is thus excluded that, for example, by short-circuiting the signal lines 38, the gas discharge lamp 11 can be operated even when the lens 17 is damaged.

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

Abstract

The headlight proposed has a reflector (10) in which a gas-discharge lamp (11) is mounted. Located in the path of the light beam reflected by the reflector is a lens (17) by means of which one edge (15) of a shutter (14), used as a bright-dark boundary, is imaged. The lens (17) is designed as a filter which partially absorbs light, in particularly blue and UV light, thus generating heat and colouring the transmitted light, and is fitted in a mounting (28) connected to the reflector (10). Attached to the mounting (28) is a ceramic plate (34) with a reference refraction point (39), an electrical conduction track (37) being disposed on the ceramic plate. The conduction track (37) is connected by signal lines (38) to an electrical control unit (19). If, as a result of a collision, the ceramic plate (34) impacts with the lens (17), the ceramic plate breaks and the conduction track (37) is cut, thus preventing the control unit (19) from operating the gas-discharge lamp (11).

Description

Die Erfindung betrifft einen 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-A-2 155 378 bekannt. Dieser Scheinwerfer weist einen Reflektor, eine Gasentladungslampe und eine die Lichtaustrittsöffnung des Scheinwerfers abdeckende Lichtscheibe auf. Im Strahlengang der vom Reflektor reflektierten sowie der von der Gasentladungslampe direkt zur Lichtscheibe ausgesandten Lichtstrahlen ist ein scheibenförmiges Filter angeordnet, das Licht im UV-Wellenlängenbereich zumindest teilweise absorbiert. Als Filter dient dabei die Lichtscheibe. Nachteilig bei diesem Scheinwerfer ist, daß bei beispielsweise in Folge eines Unfalls beschädigtem Filter, also beschädigter Lichtscheibe, beim Betrieb der Gasentladungslampe UV-Licht aus dem Scheinwerfer austreten kann, wodurch einerseits eine Gesundheitsgefährdung für sich direkt vor dem Scheinwerfer aufhaltende Personen verursacht wird und andererseits eine Beschädigung von aus Kunststoff bestehenden Bauteilen des Scheinwerfers möglich ist.Such a headlight is known from DE-A-2 155 378. This headlamp has a reflector, a gas discharge lamp and a lens covering the light outlet opening of the headlamp. A disk-shaped filter is arranged in the beam path of the light beams reflected by the reflector and those emitted directly from the gas discharge lamp to the lens, which filter at least partially absorbs light in the UV wavelength range. The lens serves as a filter. A disadvantage of this headlamp is that, for example in the event of an accident damaged filter, i.e. damaged lens, UV light can escape from the headlamp during operation of the gas discharge lamp, which on the one hand causes a health hazard for people staying directly in front of the headlamp and on the other hand a Damage to plastic components of the headlight is possible.

Durch die GB-A-1 364 927 ist außerdem ein Scheinwerfer bekannt, bei dem ein scheibenförmiges Filter vorgesehen ist, durch das von der Lichtquelle des Scheinwerfers ausgesandtes UV-Licht zumindest teilweise absorbiert wird. Als Filter kann dabei die Lichtscheibe des Scheinwerfers dienen oder ein separates, in den Scheinwerfer eingesetztes Teil. Die Lichtscheibe oder das separate Filter kann mit einer Metallbeschichtung aus Chrom versehen sein.GB-A-1 364 927 also discloses a headlight in which a disk-shaped filter is provided, by means of which UV light emitted by the light source of the headlight is at least partially absorbed. The lens of the headlight or a separate part inserted into the headlight can serve as a filter. The lens or the separate filter can be provided with a metal coating made of chrome.

Der erfindungsgemäße Scheinwerfer mit den Merkmalen des Anspruchs 1 hat den Vorteil, daß bei beschädigtem UV-Filter ein Betrieb der Gasentladungslampe verhindert wird, so daß sichergestellt ist, daß auch unter diesen Umständen kein schädliches UV-Licht aus dem Scheinwerfer austreten kann.The headlight according to the invention with the features of claim 1 has the advantage that operation of the gas discharge lamp is prevented when the UV filter is damaged, so that it is ensured that no harmful UV light can escape from the headlight even under these circumstances.

Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen angegeben. Durch die im Anspruch 3 angegebene zusätzliche Ausbildung der Lichtscheibe als UV-Filter ist eine gezielte Erwärmung derselben erreicht, so daß beim Betrieb der Gasentladungslampe auf der Lichtscheibe niedergeschlagene Feuchtigkeit abtrocknet und auf dieser angefrorene Feuchtigkeit abtaut. Durch die Ausgestaltung gemäß Anspruch 8 wird die Leitung bei beispielsweise infolge eines Aufpralls sich aus der Halterung bewegendem Objektiv unterbrochen und somit auf einfache Weise der Ausfall des Objektivs angezeigt. Mit der Maßnahme gemäß Anspruch 11 ist sichergestellt, daß nicht durch Kurzschließen der Meldeleitungen die Gasentladungslampe auch bei beschädigtem UV-Filter betrieben werden kann.Advantageous refinements and developments of the invention are specified in the dependent claims. Through the additional design of the lens as a UV filter specified in claim 3, a targeted heating of the same is achieved, so that during operation of the gas discharge lamp Moisture deposited on the lens dries and thaws on this frozen moisture. Due to the configuration according to claim 8, the line is interrupted when the lens moves out of the holder, for example as a result of an impact, and the failure of the lens is thus displayed in a simple manner. The measure according to claim 11 ensures that the gas discharge lamp cannot be operated even if the UV filter is damaged by short-circuiting the signal lines.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt. Es zeigen Figur 1 einen Scheinwerfer in stark vereinfachter Darstellung in einem Längsschnitt, Figur 2 den Scheinwerfer in einer detaillierten Darstellung und Figur 3 einen in Figur 2 mit III bezeichneten Ausschnitt in perspektivischer Darstellung.An embodiment of the invention is shown in the drawing. FIG. 1 shows a headlamp in a greatly simplified illustration in a longitudinal section, FIG. 2 shows the headlamp in a detailed illustration and FIG. 3 shows a detail shown in FIG. 2 with a perspective illustration.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Bei einem in Figur 1 dargestellten Ausführungsbeispiel eines Abblendlichtscheinwerfers für Kraftahrzeuge weist dieser einen Reflektor 10 auf, in den von dessen Rückseite her eine Gasentladungslampe 11 eingesetzt ist. Im vertikalen und horizontalen Meridianschnitt des Reflektors 10 ergeben sich Ellipsen, wobei der axiale Lichtbogen 12 der Gasentladungslampe 11 im Bereich des inneren Brennpunktes Fe der Ellipsen auf der optischen Achse 13 des Reflektors angeordnet ist. In Richtung der vom Reflektor 10 reflektierten Lichtstrahlen ist unterhalb der optischen Achse 13 im Bereich des äußeren Brennpunkts Fe′ der Ellipsen eine Blende 14 mit einer optisch wirksamen Oberkante 15 angeordnet. Weiter sind in Lichtaustrittsrichtung ein Objektiv 17 sowie eine die Lichtaustrittsöffnung des Scheinwerfers abdeckende Lichtscheibe 18 angeordnet, die als Streuscheibe ausgebildet sein kann. Beim Betrieb der Gasentladungslampe 11 bilden die Lichtstrahlen die Oberkante 15 der Blende 14 über das Objektiv 17 als Hell-Dunkel-Grenze der Lichtverteilung des Scheinwerfers ab.In an exemplary embodiment of a low beam headlight for motor vehicles shown in FIG. 1, it has a reflector 10, in the back of which a gas discharge lamp 11 is inserted. Ellipses result in the vertical and horizontal meridian section of the reflector 10, the axial arc 12 of the gas discharge lamp 11 being arranged in the region of the inner focal point Fe of the ellipses on the optical axis 13 of the reflector. In the direction of the light rays reflected by the reflector 10, an aperture 14 with an optically effective upper edge 15 is arranged below the optical axis 13 in the area of the outer focus Fe 'of the ellipses. Furthermore, a lens 17 and a light disk 18 covering the light outlet opening of the headlight are arranged in the light exit direction, which can be designed as a diffusing screen. During operation of the gas discharge lamp 11, the light beams represent the upper edge 15 of the diaphragm 14 via the lens 17 as the light-dark boundary of the light distribution of the headlight.

Die Gasentladungslampe 11 wird durch ein vom elektrischen Bordnetz des Kraftfahrzeugs gespeistes und durch ein Steuergerät 19 angesteuertes Zündgerät 20 mit der zu ihrem Betrieb erforderlichen Hochspannung versorgt. Außer sichtbarem Licht sendet die Gasentladungslampe 11 bei ihrem Betrieb auch Licht im UV-Wellenlängenbereich mit hoher Intensität aus.The gas discharge lamp 11 is supplied with the high voltage required for its operation by an ignition device 20 which is fed by the electrical system of the motor vehicle and controlled by a control device 19. In addition to visible light, the gas discharge lamp 11 also emits light in the UV wavelength range with high intensity during its operation.

Zur Abschirmung des UV-Lichts der Gasentladungslampe 11 dient das Objektiv 17 als UV-Filter und ist mit einer Beschichtung 23 versehen, die UV-Licht absorbiert.To shield the UV light from the gas discharge lamp 11, the lens 17 serves as a UV filter and is provided with a coating 23 which absorbs UV light.

Die Beschichtung 23 kann durch eine dünne Metallschicht beispielsweise aus Gold oder Chrom gebildet sein. Die Beschichtung 23 kann jedoch auch durch eine Fluoridschicht gebildet sein.The coating 23 can be formed by a thin metal layer, for example made of gold or chrome. However, the coating 23 can also be formed by a fluoride layer.

Außerdem kann das Objektiv 17 auch durch einen geeigneten Glaswerkstoff oder durch Beimengungen zum Glaswerkstoff UV-Licht absorbierende Eigenschaften erhalten. Bei dem Scheinwerfer des Ausführungsbeispiels kann zwischen der Gasentladungslampe 11 und der Lichtscheibe 18 ein scheibenförmiges UV-Filter 22 angeordnet sein, oder die Lichtscheibe 18 mittels einer Beschichtung 23 oder eines geeigneten Glaswerkstoffs als UV-Filter dienen.In addition, the lens 17 can also be given UV-light-absorbing properties by a suitable glass material or by admixtures to the glass material. In the headlamp of the exemplary embodiment, a disk-shaped UV filter 22 can be arranged between the gas discharge lamp 11 and the lens 18, or the lens 18 can serve as a UV filter by means of a coating 23 or a suitable glass material.

Durch die Beschichtung 23 der Lichtscheibe 18 ist nicht nur eine Abschirmung der UV-Strahlung erreicht, diese stellt außerdem eine Vergütung der in der Lichtscheibe 18 dargestellten Glasoptik dar, so daß eine unerwünschte Streuung der hindurchtretenden Lichtstrahlen vermindert ist.The coating 23 of the lens 18 not only shields the UV radiation, this also represents a compensation for the glass optics shown in the lens 18, so that undesired scattering of the light rays passing through is reduced.

Die Beschichtung 23 erwärmt sich wegen der absorbierten UV-Strahlung, was zu einer Erwärmung der Lichtscheibe 18 führt. Somit ist eine Erwärmung der Lichtscheibe 18 zur Beschleunigung der Abtrocknung und Enteisung der Lichtscheibe ohne Fremdenergieaufwendung erreicht. Anstelle der Beschichtung 23 kann auch die Lichtscheibe 18 selbst durch entsprechende Auswahl des Glaswerkstoffs oder durch entsprechende Beimengungen zum Glaswerkstoff die Eigenschaft aufweisen, UV-Licht zu absorbieren. Durch eine bräunliche Färbung der Beschichtung 23 bzw. der Lichtscheibe 18 kann dem aus dem Scheinwerfer austretenden Licht eine Färbung gegeben werden, so daß es 'wärmer' wirkt. Außerdem kann die Beschichtung 23 bzw. die Lichtscheibe 18 so ausgebildet sein, daß blaues Licht teilweise absorbiert wird, damit das aus dem Scheinwerfer austretende Licht weniger blau erscheint.The coating 23 heats up due to the absorbed UV radiation, which leads to a heating of the lens 18. Heating of the lens 18 to accelerate the drying and defrosting of the lens without the use of external energy is thus achieved. Instead of the coating 23, the lens 18 can also be used even by appropriate selection of the glass material or by appropriate additions to the glass material have the property of absorbing UV light. A brownish coloring of the coating 23 or the lens 18 can give the light emerging from the headlight a coloring, so that it looks 'warmer'. In addition, the coating 23 or the lens 18 can be designed so that blue light is partially absorbed so that the light emerging from the headlight appears less blue.

Durch die Färbung der Beschichtung 23 bzw. der Lichtscheibe 18 ist ebenfalls eine Erwärmung der Lichtscheibe 18 beim Betrieb der Gasentladungslampe 11 erreicht.The coloring of the coating 23 or the lens 18 likewise heats the lens 18 when the gas discharge lamp 11 is in operation.

Bei einer Variante des Scheinwerfers ist zwischen der Gasentladungslampe 11 und der Lichtscheibe 18 ein in Figur 1 gestrichelt eingezeichnetes scheibenförmiges Filter 22 angeordnet, das mit einer wie vorstehend für die Lichtscheibe beschriebenen UV-Licht absorbierenden Beschichtung 23 versehen ist oder durch entsprechende Werkstoffwahl bzw. Beimengungen zu einem Glaswerkstoff die Eigenschaft aufweist, UV-Licht zu absorbieren.In a variant of the headlight, a disc-shaped filter 22 is shown between the gas discharge lamp 11 and the lens 18, which is shown with a broken line in FIG a glass material has the property of absorbing UV light.

Die Gasentladungslampe 11 ist über einen Lampenträger 26 in den Reflektor 10 eingesetzt und an ihrer Rückseite mit einer Kappe 27 abgedeckt.The gas discharge lamp 11 is inserted into the reflector 10 via a lamp holder 26 and covered on its rear side with a cap 27.

Mit dem Vorderrand des Reflektors 10 ist ein Träger 28 verbunden, der sich in Lichtaustrittssrichtung erstreckt und an seinem vom Reflektor 10 wegweisenden Ende eine Halterung 29 zur Aufnahme des Objektivs 17 aufweist. Der Träger 28 ist als an seinem Umfang geschlossener Hohlzylinder ausgeführt und besteht aus Blech. Der Reflektor 10 bildet mit dem Träger 28 und dem Objektiv 17 einen dichten Verbund, so daß weder durch diese Teile noch zwischen diesen des Scheinwerfers abdeckende Lichtscheibe 18 angeordnet, die als Streuscheibe ausgebildet sein kann. Beim Betrieb der Gasentladungslampe 11 bilden die Lichtstrahlen die Oberkante 15 der Blende 14 über das Objektiv 17 als Hell-Dunkel-Grenze der Lichtverteilung des Scheinwerfers ab.A carrier 28 is connected to the front edge of the reflector 10 and extends in the direction of light exit and has a holder 29 for receiving the lens 17 at its end pointing away from the reflector 10. The carrier 28 is designed as a hollow cylinder closed on its circumference and consists of sheet metal. The reflector 10 forms a tight bond with the support 28 and the lens 17, so that neither through these parts nor between them of the headlight covering lens 18 is arranged, which can be designed as a lens. During operation of the gas discharge lamp 11, the light beams represent the upper edge 15 of the diaphragm 14 via the lens 17 as the light-dark boundary of the light distribution of the headlight.

Zur Abschirmung des UV-Lichts der Gasentladungslampe 11 dient das Objektiv 17 als UV-Filter und ist mit einer Beschichtung 23 versehen, die UV-Licht absorbiert. Die Beschichtung 23 kann wie beim ersten Ausführungsbeispiel beschrieben ausgeführt sein. Außerdem kann das Objektiv 17 auch durch einen geeigneten Glaswerkstoff oder durch Beimengungen zum Glaswerkstoff UV-Licht absorbierende Eigenschaften erhalten. Alternativ kann bei dem Scheinwerfer des zweiten Ausführungsbeispiels zwischen der Gasentladungslampe 11 und der Lichtscheibe 18 ein scheibenförmiges UV-Filter 22 angeordnet sein, oder die Lichtscheibe 18 mittels einer Beschichtung 23 oder eines geeigneten Glaswerkstoffs als UV-Filter dienen.To shield the UV light from the gas discharge lamp 11, the lens 17 serves as a UV filter and is provided with a coating 23 which absorbs UV light. The coating 23 can be designed as described in the first exemplary embodiment. In addition, the lens 17 can also be given UV-light-absorbing properties by a suitable glass material or by admixtures to the glass material. Alternatively, in the headlamp of the second exemplary embodiment, a disk-shaped UV filter 22 can be arranged between the gas discharge lamp 11 and the lens 18, or the lens 18 can serve as a UV filter by means of a coating 23 or a suitable glass material.

In Figur 3 und 4 ist ein drittes Ausführungsbeispiel des Scheinwerfers dargestellt, bei dem wie beim zweiten Ausführungsbeispiel das Objektiv 17 als UV-Filter dient und durch eine Beschichtung oder einen geeigneten Glaswerkstoff bzw. Beimengungen zum Glaswerkstoff die Eigenschaft aufweist UV-Licht zu absorbieren. Die Gasentladungslampe 11 ist über einen Lampenträger 26 in den Reflektor 10 eingesetzt und an ihrer Rückseite mit einer Kappe 27 abgedeckt.FIGS. 3 and 4 show a third exemplary embodiment of the headlight, in which, as in the second exemplary embodiment, the objective 17 serves as a UV filter and has the property of absorbing UV light by means of a coating or a suitable glass material or additions to the glass material. The gas discharge lamp 11 is inserted into the reflector 10 via a lamp holder 26 and covered on its rear side with a cap 27.

Mit dem Vorderrand des Reflektors 10 ist ein Träger 28 verbunden, der sich in Lichtaustrittssrichtung erstreckt und an seinem vom Reflektor 10 wegweisenden Ende eine Halterung 29 zur Aufnahme des Objektivs 17 aufweist. Der Träger 28 ist als an seinem Umfang geschlossener Hohlzylinder ausgeführt und besteht aus Blech. Der Reflektor 10 bildet mit dem Träger 28 und dem Objektiv 17 einen dichten Verbund, so daß weder durch diese Teile noch zwischen diesen UV-Strahlung austreten kann. Zur Streuscheibe 18 hin ist ein Rahmen 31 angeordnet, der zum Lichtdurchtritt eine Öffnung 32 in der Größe des Objektivs 17 aufweist. Das Objektiv 17 ist in den Träger 28 von dessen zum Reflektor 10 weisendem Ende her einsetzbar und kommt an einem einen Teil der Halterung 29 bildenden, radial nach innen weisenden Rand 33 des Trägers 28 in Lichtaustrittsrichtung zur Anlage, gegen den es durch einen Federring 30 gehalten wird. Der Federring 30 ist in seinem unteren Bereich offen. Am Träger 28 ist an einer Seite, hier oben, ein Anschlag 36 angeordnet, der hier eine Niet ist, zwischen dem und dem Rand 33 der Rand des Objektivs 17 und der Federring 30 im montierten Zustand des Objektivs zu liegen kommen. Vorzugsweise diametral gegenüberliegend ist eine Keramikplatte 34 am Träger 28 befestigbar, die bei montiertem Objektiv 17 durch den offenen Bereich des Federrings 30 radial nach innen ragt und den Rand des Objektivs 17 zur Seite des Reflektors 10 hin übergreift. Dabei könnte die Keramikplatte 34 auch zur Lagefixierung des Objektivs 17 an dieser Stelle dienen, wenn auf den Federring 30 verzichtet wird.A carrier 28 is connected to the front edge of the reflector 10 and extends in the direction of light exit and has a holder 29 for receiving the lens 17 at its end pointing away from the reflector 10. The carrier 28 is designed as a hollow cylinder closed on its circumference and consists of sheet metal. The reflector 10 forms a tight bond with the support 28 and the lens 17, so that neither through these parts nor between them UV radiation can escape. A frame 31 is arranged toward the lens 18 and has an opening 32 the size of the objective 17 for the passage of light. The lens 17 can be inserted into the carrier 28 from its end facing the reflector 10 and comes to rest against a radially inwardly facing edge 33 of the carrier 28 forming part of the holder 29, against which it is held by a spring ring 30 becomes. The spring ring 30 is open in its lower area. Arranged on the carrier 28 on one side, here above, is a stop 36, which here is a rivet, between which and the edge 33 the edge of the objective 17 and the spring ring 30 come to rest when the objective is assembled. A ceramic plate 34, preferably diametrically opposite, can be fastened to the carrier 28, which projects radially inward through the open area of the spring ring 30 when the lens 17 is mounted and overlaps the edge of the lens 17 to the side of the reflector 10. The ceramic plate 34 could also serve to fix the position of the objective 17 at this point if the spring ring 30 is dispensed with.

Auf der Keramikplatte 34 ist eine elektrische Leiterbahn 37 aufgedampft, die über Meldeleitungen 38 mit dem elektrischen Steuergerät 19 verbunden ist, das das Zündgerät 20 ansteuert. Die Keramikplatte 34 weist eine durch eine Kerbe 39 bestimmte Sollbruchstelle auf, wobei sich die Leiterbahn 37 auf der Keramikplatte 34 über die Kerbe 39 hinweg erstreckt. Die Kerbe 39 ist so angeordnet, daß bei einer auf das Objektiv 17 in Richtung auf den Reflektor 10 wirkenden Kraft bestimmter Größe die Keramikplatte 34 durch das sich in Folge des Gegenhalters 36 in seinem unteren Bereich aus der Halterung 29 bewegende Objektiv 17 zerbrochen wird, wodurch die Leiterbahn 37 unterbrochen wird. Dient als Fixierung des Objektivs 17 der Federring 50, so kann die Keramikplatte 34 mit einem kleinen Abstand vom Objektiv angeordnet sein, so daß sie im Betrieb keinen schwingenden Belastungen vom Objektiv her ausgesetzt ist, die zu einem ungewollten Bruch führen könnten. Durch eine Sicherheitsschaltung des Steuergeräts 19 wird eine Unterbrechung der Leiterbahn 37 erkannt und der Betrieb der Gasentladungslampe 11 verhindert. Somit ist sichergestellt, daß bei beispielsweise in Folge eines Unfalls beschädigtem Objektiv 17 keine UV-Strahlung aus dem Scheinwerfer austritt und keine unter Hochspannung stehenden Teile berührt werden können. Ist jedoch nur die Lichtscheibe 18 zerstört und das Objektiv 17 noch in seiner Halterung 29, so kann der Scheinwerfer weiterbetrieben werden, da der Verbund der Teile Reflektor, Träger und Objektiv noch intakt ist und keine schädliche UV-Strahlung austreten kann. Durch den Rahmen 31 werden der Träger 28 sowie die Keramikplatte 34 und deren elektrische Anschlüsse verdeckt.An electrical conductor track 37 is vapor-deposited on the ceramic plate 34 and is connected via signal lines 38 to the electrical control device 19 which controls the ignition device 20. The ceramic plate 34 has a predetermined breaking point determined by a notch 39, the conductor track 37 on the ceramic plate 34 extending beyond the notch 39. The notch 39 is arranged in such a way that when a force of a certain size acts on the lens 17 in the direction of the reflector 10, the ceramic plate 34 is broken by the lens 17 moving as a result of the counter-holder 36 in its lower region from the holder 29, thereby the conductor track 37 is interrupted. If the spring ring 50 serves to fix the lens 17, the ceramic plate 34 can be arranged at a small distance from the lens so that it does not vibrate during operation Exposed to the lens, which could lead to an unwanted break. An interruption of the conductor track 37 is recognized by a safety circuit of the control device 19 and the operation of the gas discharge lamp 11 is prevented. This ensures that, for example in the event of a lens 17 damaged as a result of an accident, no UV radiation emerges from the headlight and no parts under high voltage can be touched. However, if only the lens 18 is destroyed and the lens 17 is still in its holder 29, the headlight can continue to be operated since the combination of the parts reflector, support and lens is still intact and no harmful UV radiation can escape. The frame 28, the ceramic plate 34 and their electrical connections are covered by the frame 31.

Als weitere Sicherheitsmaßnahme kann auf der Keramikplatte 34 eine Spannungsteilerschaltung aufgebracht sein, die zwei Widerstände R1 und R2 aufweist, an denen ein definierter Spannungsabfall auftritt. Durch den Sollbruch wird eine der Leitungen des Spannungsteilers unterbrochen, so daß sich der Spannungsabfall im Verhältnis zum anderen Zweig der Spannungsteilerschaltung wesentlich ändert und somit die Störung angezeigt ist. Tritt ein von dem vorgegebenen Spannungsabfall abweichender Spannungsabfall auf, so wird dies durch die Sicherheitsschaltung des Steuergeräts 19 erkannt und der Betrieb der Gasentladungslampe 11 verhindert. So wird ausgeschlossen, daß beispielsweise durch Kurzschließen der Meldeleitungen 38 die Gasentladungslampe 11 auch bei beschädigtem Objektiv 17 betrieben werden kann.As a further safety measure, a voltage divider circuit can be applied to the ceramic plate 34, which has two resistors R1 and R2, across which a defined voltage drop occurs. Due to the predetermined breaking, one of the lines of the voltage divider is interrupted, so that the voltage drop in relation to the other branch of the voltage divider circuit changes significantly and the fault is thus indicated. If a voltage drop that deviates from the predetermined voltage drop occurs, this is recognized by the safety circuit of the control device 19 and the operation of the gas discharge lamp 11 is prevented. It is thus excluded that, for example, by short-circuiting the signal lines 38, the gas discharge lamp 11 can be operated even when the lens 17 is damaged.

Claims (14)

  1. Headlamp for motor vehicles having a reflector (10), having a gas discharge lamp (11) and having an front plate (18) which covers the light exit opening of the headlamp, a disc-shaped filter (17) being arranged in the beam path of the light beams reflected by the reflector (10) and of the light beams transmitted directly to the front plate (18) from the gas discharge lamp (11) which filter at least partially absorbs light in the UV wavelength region, characterised in that a shutter (14) is arranged in the beam path of the light beams reflected by the reflector (10), in that in the beam path of the light beams influenced by the shutter (14) a lens (17) is arranged by means of which an image of an edge (15) of the shutter (14) is formed as a light/dark border of the light distribution, in that the lens (17) is provided with a coating (23) which absorbs light in the UV wavelength region or consists of a UV light-absorbing material and serves as the filter, and in that the lens (17) is arranged in a holder (29), the holder (29) having a component (34) with an electrical line (37) and the electrical line (37) being interrupted when the lens (17) impacts against the component (34) with a specific force, operation of the gas discharge lamp being prevented when the line (37) is interrupted.
  2. Headlamp according to Claim 1, characterised in that a further filter (22) arranged between gas discharge lamp (11) and front plate (18) is additionally provided in the form of a disc, which is provided with a UV light-absorbing coating (23) or consists of a UV light-absorbing material.
  3. Headlamp according to Claim 1, characterised in that the front plate (18) is additionally provided with a UV light-absorbing coating (23) or consists of a UV light-absorbing material.
  4. Headlamp according to one of the preceding claims, characterised in that the filter (17; 18; 22) is provided with a metal coating (23) of gold or chromium.
  5. Headlamp according to one of Claims 1 to 3, characterised in that the filter (17; 18; 22) is provided with a fluoride coating.
  6. Headlamp according to one of the preceding claims, characterised in that the filter (17; 18; 22) has a brownish colouring.
  7. Headlamp according to one of the preceding claims, characterised in that the filter (17; 18; 22) absorbs light in the blue wavelength region.
  8. Headlamp according to one of the preceding claims, characterised in that the line is realised as a conductor track (37) mounted on the component (34) and the component (34) is broken in such a way by the lens (17) when it impacts against the component (34) that the conductor track (37) is interrupted.
  9. Headlamp according to Claim 8, characterised in that the component (34) consists of ceramic and is provided with a predetermined break point (39).
  10. Headlamp according to one of the preceding claims, characterised in that the line (37) is connected via signalling lines (38) to an electrical control device (19), the prevention of the operation of the gas discharge lamp (11) occurring by means of a safety circuit of the control device (19) when the line (37) or signalling line (38) is interrupted.
  11. Headlamp according to Claim 10, characterised in that a voltage divider circuit is provided in the line (37) and in that the control device (19) has an evaluation circuit by means of which the operation of the gas discharge lamp (11) is prevented in the event of a voltage drop in the line (37) deviating from a voltage drop predetermined by the voltage divider circuit.
  12. Headlamp according to Claim 11, characterised in that the voltage divider circuit is arranged on the component (34).
  13. Headlamp according to one of the preceding claims, characterised in that the lens (17) is arranged in a carrier (28) which is connected to the reflector (10) and constructed as a hollow cylinder closed at its circumference.
  14. Headlamp according to one of the preceding claims, characterised in that the lens (17) is held resting against a radially inwardly pointing edge (33) of the carrier by means of a radially elastic resilient ring (30) which can be inserted into the carrier (28).
EP91911253A 1990-06-20 1991-06-12 Vehicle headlight Expired - Lifetime EP0487679B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE4019641 1990-06-20
DE4019641 1990-06-24
DE4109657A DE4109657A1 (en) 1990-06-20 1991-03-23 HEADLIGHTS FOR MOTOR VEHICLES
DE4109657 1991-03-23
PCT/DE1991/000493 WO1991019938A1 (en) 1990-06-20 1991-06-12 Vehicle headlight

Publications (2)

Publication Number Publication Date
EP0487679A1 EP0487679A1 (en) 1992-06-03
EP0487679B1 true EP0487679B1 (en) 1995-05-24

Family

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EP91911253A Expired - Lifetime EP0487679B1 (en) 1990-06-20 1991-06-12 Vehicle headlight

Country Status (5)

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US (1) US5289352A (en)
EP (1) EP0487679B1 (en)
JP (1) JPH05500879A (en)
DE (2) DE4109657A1 (en)
WO (1) WO1991019938A1 (en)

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DE4445187A1 (en) * 1994-12-17 1996-06-20 Hella Kg Hueck & Co Headlights for vehicles
FR2759765B1 (en) * 1997-02-18 1999-06-04 Valeo Vision ELLIPTICAL PROJECTOR, PARTICULARLY FOR MOTOR VEHICLE
DE19839194B4 (en) * 1998-08-28 2010-01-28 Automotive Lighting Reutlingen Gmbh Headlamp for vehicles according to the projection principle
DE19907365A1 (en) * 1999-02-20 2001-01-04 Matthias Rettig Xenon headlamp for automobile has filters or filter foils used for absorbing selected light components to prevent dazzle of oncoming automobile driver
CZ297837B6 (en) * 2001-05-15 2007-04-11 Autopal, S. R. O. Projector lens holder
FR2850616B1 (en) * 2003-01-30 2006-02-17 Valeo Vision METHOD OF LIGHTING MODULE OF A ROAD AND PROJECTOR OF A VEHICLE USING THE SAME
DE102004047324A1 (en) * 2004-09-29 2006-04-13 Osram Opto Semiconductors Gmbh LED array
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Also Published As

Publication number Publication date
DE4109657A1 (en) 1992-01-02
DE59105580D1 (en) 1995-06-29
WO1991019938A1 (en) 1991-12-26
EP0487679A1 (en) 1992-06-03
US5289352A (en) 1994-02-22
JPH05500879A (en) 1993-02-18

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