EP0581048B1 - Vehicular headlights - Google Patents

Vehicular headlights Download PDF

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Publication number
EP0581048B1
EP0581048B1 EP93110566A EP93110566A EP0581048B1 EP 0581048 B1 EP0581048 B1 EP 0581048B1 EP 93110566 A EP93110566 A EP 93110566A EP 93110566 A EP93110566 A EP 93110566A EP 0581048 B1 EP0581048 B1 EP 0581048B1
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EP
European Patent Office
Prior art keywords
lens
projection lens
motor vehicle
reflector
headlight
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
EP93110566A
Other languages
German (de)
French (fr)
Other versions
EP0581048A1 (en
Inventor
Horst Dietewich
Joachim Ripperger
Tassilo Stempfl
Albert Groeber
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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.)
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Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0581048A1 publication Critical patent/EP0581048A1/en
Application granted granted Critical
Publication of EP0581048B1 publication Critical patent/EP0581048B1/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
    • 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
    • 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

Definitions

  • the invention relates to a motor vehicle headlight according to the preamble of patent claim 1.
  • a motor vehicle headlight working on the projection principle is known for example from DE-PS 36 40 773.
  • the projection lens sits in front of the cover plate.
  • motor vehicle headlights according to the preamble of claim 1 are on the market, in which a lens with a flat or curved surface sits between the cover plate and the projection lens. The purpose of this lens is to achieve an optical impression of the headlight that is the same as that of conventional headlights.
  • These headlights do not work according to the projection principle, but only have a reflector, a lens and a cover plate. Compared to headlights that work according to the projection principle, these headlights have a reflector with a significantly larger diameter.
  • a projection headlight with an ellipsoidal reflector is known, in which the projection lens is seated in a ring made of semi-transparent material. Through this ring, headlights should fall into the apron of the vehicle.
  • a motor vehicle headlight in which a diffusing screen is provided to enlarge the optical impression of the headlight.
  • the lens is illuminated by a separate light source and is also mirrored on the back.
  • the light of the headlamp is impaired due to the course of the lens up to the projection lens and thus into the beam path of the headlamp.
  • the invention has for its object to provide a motor vehicle headlamp of the type mentioned, which works on the projection principle, in addition to a cover plate has a lens and which is characterized by a small depth.
  • the penetration of the lens through the projection lens means that no additional space is required compared to such a headlight without a projection lens.
  • the light emerging from the projection lens passes through the lens without loss of light. This only acts on the light emitted laterally by the projection lens and collects it to form a light ring which, in conjunction with the projection lens, gives a flat overall impression of the light source.
  • the seemingly effective light area of the headlamp corresponds to that of conventional headlamps.
  • the lens Since the lens only absorbs an insignificant part of the light emitted by the projection lens, it is not exposed to any significant thermal stress. It is therefore possible to manufacture the lens from transparent plastic and thus save weight.
  • the spreading disc also increases the weight of the headlamp, measured on a headlamp working according to the project principle without a lens, only insignificantly.
  • the lens Due to the relatively low weight of the lens, it can be attached to the edge of the reflector. It then changes the optical properties of the reflector only insignificantly even under mechanical load. Overall, this results in a design that is characterized by advantages in terms of production technology.
  • the lens is attached to the reflector and can be used as a structural unit in the headlight housing.
  • the motor vehicle headlight 1 shown in the figure essentially consists of the following parts: An incandescent lamp 2, a reflector 3, additional reflectors 4 and 5 and a projection lens 6.
  • the headlight 1 sits in a housing 7 and forms, together with other lights, not shown, a structural unit which is covered by a cover plate 8 to the outside.
  • the headlamp also has a diffuser 9, known per se, which is provided with a central opening 10.
  • the projection lens 6 passes through this.
  • the position of the lens 9 with respect to the projection lens 6 is such that the light emerging from the headlight 1 passes through the opening 10 essentially freely and after the cover plate 8 occurs in the exterior of the motor vehicle. Only a small proportion of this light emerges laterally from the projection lens 6 and reaches the lens 9.
  • the effective light exit surface of the headlight 1 acts as a surface through the edge 9 'of the Diffuser 9 is limited. Compared to the light exit surface, which is given by the outer dimensions of the projection lens 6, this light exit surface appears many times larger.
  • the space required by the lens 9 is approximately equal to the space due to the penetration, which is required without such a lens. Due to the small dimensions and the arrangement, the lens 9 can be made of plastic and can be attached to the edge of the reflector 3 via a funnel-shaped additional reflector 3 '(not shown in detail). This results in a headlight that is characterized by an unchanged installation space in addition to a good visual appearance.

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

Description

Die Erfindung bezieht sich auf einen Kraftfahrzeug-Scheinwerfer gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a motor vehicle headlight according to the preamble of patent claim 1.

Ein nach dem Projektionsprinzip arbeitender Kraftfahrzeug-Scheinwerfer ist beispielsweise aus der DE-PS 36 40 773 bekannt. Bei diesem Kraftfahrzeug-Scheinwerfer sitzt die Projektionslinse vor der Abdeckscheibe. Ferner sind Kraftfahrzeug-Scheinwerfer gemäß dem Oberbegrifff des Patentanspruchs 1 in Verkehr, bei denen zwischen der Abdeckscheibe und der Projektionslinse eine Streuscheibe mit planer bzw. gekrümmter Oberfläche sitzt. Aufgabe dieser Streuscheibe ist es einen optischen Eindruck des Scheinwerfers zu erzielen, der gleich dem von konventionellen Scheinwerfern ist. Diese Scheinwerfer arbeiten nicht nach dem Projektionsprinzip, sondern besitzen lediglich einen Reflektor, eine Streuscheibe und eine Abdeckscheibe. Gegenüber Scheinwerfern, die nach dem Projektionsprinzip arbeiten, besitzen diese Scheinwerfer einen Reflektor mit deutlich größerem Durchmesser.A motor vehicle headlight working on the projection principle is known for example from DE-PS 36 40 773. In this motor vehicle headlight, the projection lens sits in front of the cover plate. Furthermore, motor vehicle headlights according to the preamble of claim 1 are on the market, in which a lens with a flat or curved surface sits between the cover plate and the projection lens. The purpose of this lens is to achieve an optical impression of the headlight that is the same as that of conventional headlights. These headlights do not work according to the projection principle, but only have a reflector, a lens and a cover plate. Compared to headlights that work according to the projection principle, these headlights have a reflector with a significantly larger diameter.

Aus der GB-A 214002 ist ein Projektionsscheinwerfer mit ellipsoidförmigem Reflektor bekannt, bei dem die Projektionslinse in einem Ring aus halbdurchlässigem Material sitzt. Durch diesen Ring soll Scheinwerferlicht in das Vorfeld des Fahrzeugs fallen.From GB-A 214002 a projection headlight with an ellipsoidal reflector is known, in which the projection lens is seated in a ring made of semi-transparent material. Through this ring, headlights should fall into the apron of the vehicle.

Aus der GB-A-2245697 ist ein Kraftfahrzeug-Scheinwerfer bekannt, bei dem eine Streuscheibe zur Vergrößerung des optischen Eindrucks des Scheinwerfers vorgesehen ist. Die Streuscheibe ist durch eine separate Lichtquelle beleuchtet und darüber hinaus an ihrer Rückseite verspiegelt. Das Licht des Scheinwerfers ist, bedingt durch den Verlauf der Streuscheibe bis hin zur Projektionslinse und damit in den Strahlengang des Scheinwerfers hinein beeinträchtigt.From GB-A-2245697 a motor vehicle headlight is known, in which a diffusing screen is provided to enlarge the optical impression of the headlight. The lens is illuminated by a separate light source and is also mirrored on the back. The light of the headlamp is impaired due to the course of the lens up to the projection lens and thus into the beam path of the headlamp.

Sieht man, wie beschrieben, bei einem Scheinwerfer mit Projektionsprinzip zwischen der Abdeckscheibe und der Projektionslinse eine Streuscheibe vor, so führt dies zu einer relativ großen Bautiefe des Scheinwerfers. Diese Bautiefe entspricht der des konventionellen Scheinwerfers. Damit aber geht der Gewinn an Bauraum, der sich für derartige Scheinwerfer aufgrund des deutlich geringeren Reflektor-Durchmessers ergibt, weitgehend verloren.One sees, as described, with a headlight with a projection principle between the cover plate and the Projection lens in front of a lens, this leads to a relatively large depth of the headlamp. This depth corresponds to that of the conventional headlamp. However, the gain in installation space that results for headlights of this type due to the significantly smaller reflector diameter is largely lost.

Der Erfindung liegt die Aufgabe zugrunde, einen Kraftfahrzeug-Scheinwerfer der eingangs genannten Art zu schaffen, der nach dem Projektionsprinzip arbeitet, zusätzlich zu einer Abdeckscheibe eine Streuscheibe besitzt und der sich durch eine geringe Bautiefe auszeichnet.The invention has for its object to provide a motor vehicle headlamp of the type mentioned, which works on the projection principle, in addition to a cover plate has a lens and which is characterized by a small depth.

Die Erfindung löst diese Aufgabe durch die kennzeichnenden Merkmale des Patentanspruchs 1.The invention solves this problem by the characterizing features of patent claim 1.

Die Durchdringung der Streuscheibe durch die Projektionslinse führt dazu, daß gegenüber einem derartigen Scheinwerfer ohne Projektionslinse kein zusätzlicher Bauraum erforderlich ist. Darüberhinaus tritt das aus der Projektionslinse austretende Licht ohne Lichtverluste durch die Streuscheibe hindurch. Diese wirkt lediglich auf das seitlich von der Projektionslinse ausgestrahlte Licht und sammelt dieses zu einem Lichtkranz, der in Verbindung mit der Projektionslinse einen flächigen Gesamteindruck der Lichtquelle ergibt. Die scheinbar wirksame Lichtfläche des Scheinwerfers entspricht der bei konventionellen Scheinwerfern.The penetration of the lens through the projection lens means that no additional space is required compared to such a headlight without a projection lens. In addition, the light emerging from the projection lens passes through the lens without loss of light. This only acts on the light emitted laterally by the projection lens and collects it to form a light ring which, in conjunction with the projection lens, gives a flat overall impression of the light source. The seemingly effective light area of the headlamp corresponds to that of conventional headlamps.

Da die Streuscheibe nur einen unwesentlichen Teil des von der Projektionslinse ausgesandten Lichts aufnimmt, ist sie einer wesentlichen thermischen Belastung nicht ausgesetzt. Es ist damit möglich, die Streuscheibe aus transparentem Kunststoff zu fertigen und damit Gewicht zu sparen. Damit erhöht die Streuscheibe auch das Gewicht des Scheinwerfers, gemessen an einem nach dem Projektsprinzip arbeitenden Scheinwerfer ohne Streuscheibe, nur unwesentlich.Since the lens only absorbs an insignificant part of the light emitted by the projection lens, it is not exposed to any significant thermal stress. It is therefore possible to manufacture the lens from transparent plastic and thus save weight. The spreading disc also increases the weight of the headlamp, measured on a headlamp working according to the project principle without a lens, only insignificantly.

Aufgrund des relativ geringen Gewichts der Streuscheibe kann diese am Rande des Reflektors befestigt sein. Sie verändert dann auch bei mechanischer Belastung die optischen Eigenschaften des Reflektors nur unwesentlich. Insgesamt ergibt sich damit eine Bauform, die sich durch fertigungstechnische Vorteile auszeichnet. Die Streuscheibe ist zusammen mit dem Reflektor befestigt und kann mit diesem als Baueinheit in das Scheinwerfer-Gehäuse eingesetzt werden.Due to the relatively low weight of the lens, it can be attached to the edge of the reflector. It then changes the optical properties of the reflector only insignificantly even under mechanical load. Overall, this results in a design that is characterized by advantages in terms of production technology. The lens is attached to the reflector and can be used as a structural unit in the headlight housing.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt.In the drawing, an embodiment of the invention is shown.

Es zeigt die einzige Figur eines Kraftfahrzeug-Scheinwerfers gemäß der Erfindung mit platzsparender Anordnung einer Streuscheibe.It shows the only figure of a motor vehicle headlight according to the invention with a space-saving arrangement of a lens.

Der in der Figur gezeigte Kraftfahrzeug-Scheinwerfer 1 besteht im wesentlichen aus folgenden Teilen:
Einer Glühlampe 2, einem Reflektor 3, Zusatzreflektoren 4 und 5 sowie einer Projektionslinse 6. Der Scheinwerfer 1 sitzt in einem Gehäuse 7 und bildet zusammen mit weiteren nicht dargestellten Leuchten eine Baueinheit, die durch eine Abdeckscheibe 8 nach außen abgedeckt ist.The motor vehicle headlight 1 shown in the figure essentially consists of the following parts:
An incandescent lamp 2, a reflector 3, additional reflectors 4 and 5 and a projection lens 6. The headlight 1 sits in a housing 7 and forms, together with other lights, not shown, a structural unit which is covered by a cover plate 8 to the outside.

Neben diesen bekannten Elementen besitzt der Scheinwerfern auch eine an sich bekannte Streuscheibe 9, die mit einer zentralen Öffnung 10 versehen ist. Durch diese hindurch tritt die Projektionslinse 6. Die Stellung der Streuscheibe 9 bezogen auf die Projektionslinse 6 ist derart, daß das aus dem Scheinwerfer 1 austretende Licht im wesentlichen frei durch die Öffnung 10 gelangt und nach der Abdeckscheibe 8 in den Außenraum des Kraftfahrzeugs tritt. Lediglich ein kleiner Anteil dieses Lichts tritt seitlich aus der Projektionslinse 6 aus und gelangt in die Streuscheibe 9. Von vorne, d. h. betrachtet aus dem mit dem Scheinwerferlicht beleuchteten Raum, wirkt die wirksame Lichtaustrittsfläche des Scheinwerfers 1 als Fläche, die durch den Rand 9' der Streuscheibe 9 begrenzt ist. Gegenüber der Lichtaustrittsfläche, die durch die Außenabmessungen der Projektionslinse 6 gegeben ist, wirkt diese Lichtaustrittsfläche um ein Vielfaches vergrößert.In addition to these known elements, the headlamp also has a diffuser 9, known per se, which is provided with a central opening 10. The projection lens 6 passes through this. The position of the lens 9 with respect to the projection lens 6 is such that the light emerging from the headlight 1 passes through the opening 10 essentially freely and after the cover plate 8 occurs in the exterior of the motor vehicle. Only a small proportion of this light emerges laterally from the projection lens 6 and reaches the lens 9. From the front, ie viewed from the room illuminated by the headlight, the effective light exit surface of the headlight 1 acts as a surface through the edge 9 'of the Diffuser 9 is limited. Compared to the light exit surface, which is given by the outer dimensions of the projection lens 6, this light exit surface appears many times larger.

Der durch die Streuscheibe 9 beanspruchte Bauraum ist aufgrund der Durchdringung etwa gleich dem Bauraum, der ohne eine derartige Streuscheibe erforderlich ist. Bedingt durch die kleinen Abmessungen und die Anordnung kann die Streuscheibe 9 aus Kunststoff bestehen und über einen trichterförmigen Zusatzreflektor 3' am Rand des Reflektors 3 befestigt sein (nicht im einzelnen dargestellt). Damit ergibt sich ein Scheinwerfer, der sich neben einem guten optischen Erscheinungsbild durch einen unveränderten Bauraum auszeichnet.The space required by the lens 9 is approximately equal to the space due to the penetration, which is required without such a lens. Due to the small dimensions and the arrangement, the lens 9 can be made of plastic and can be attached to the edge of the reflector 3 via a funnel-shaped additional reflector 3 '(not shown in detail). This results in a headlight that is characterized by an unchanged installation space in addition to a good visual appearance.

Claims (3)

  1. A motor vehicle headlamp with a light source (2), a reflector (3), a projection lens (6), a diffusion screen (9) and a cover plate (8), characterised in that the diffusion screen (9) has a central opening (10) through which the projection lens (6) penetrates at least in part, wherein the position of the diffusion screen (9) relative to the projection lens (6) is chosen such that the light emitted by the headlamp passes substantially freely through the opening (10).
  2. A motor vehicle headlamp according to claim 1, characterised in that the diffusion screen is manufactured form a transparent plastics material.
  3. A motor vehicle headlamp according to claim 1 or 2, characterised in that the diffusion screen is secured to the edge of the reflector.
EP93110566A 1992-07-28 1993-07-02 Vehicular headlights Expired - Lifetime EP0581048B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4224865A DE4224865A1 (en) 1992-07-28 1992-07-28 Motor vehicle headlights
DE4224865 1992-07-28

Publications (2)

Publication Number Publication Date
EP0581048A1 EP0581048A1 (en) 1994-02-02
EP0581048B1 true EP0581048B1 (en) 1997-08-27

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ID=6464269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93110566A Expired - Lifetime EP0581048B1 (en) 1992-07-28 1993-07-02 Vehicular headlights

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EP (1) EP0581048B1 (en)
DE (2) DE4224865A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19704426B4 (en) * 1997-02-06 2005-12-15 Automotive Lighting Reutlingen Gmbh Headlamp for vehicles according to the projection principle
FR2770618B1 (en) * 1997-11-04 2000-02-04 Valeo Vision ELLIPTICAL SPOTLIGHT WITH ENLARGED LIGHTING RANGE
DE19906527A1 (en) * 1999-02-17 2000-08-31 Volkswagen Ag Vehicle headlights
DE10007403A1 (en) * 2000-02-18 2001-08-23 Volkswagen Ag Projection headlights for a motor vehicle
DE102005015939A1 (en) * 2005-04-07 2006-10-12 Hella Kgaa Hueck & Co. Headlights for vehicles

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB214002A (en) * 1923-01-18 1924-04-17 William Thomas Coulson An improved motor head light
DE3218703A1 (en) * 1982-05-18 1983-11-24 Westfälische Metall Industrie KG Hueck & Co, 4780 Lippstadt Dimmed vehicle headlights
DE3322181C2 (en) * 1983-06-21 1985-10-10 Westfälische Metall Industrie KG Hueck & Co, 4780 Lippstadt Lights for motor vehicles, in particular fog lights
DE3633662A1 (en) * 1986-10-03 1988-04-14 Hermann Hablitzel Lens for front headlamps or the like for fitting in vehicles
JPH0320961Y2 (en) * 1986-12-23 1991-05-08
DE3703129A1 (en) * 1987-02-03 1988-08-11 Hella Kg Hueck & Co HEADLIGHT UNIT FOR VEHICLES
DE3942310A1 (en) * 1989-12-21 1991-06-27 Bayerische Motoren Werke Ag MOTOR VEHICLE HEADLIGHT
GB2245697A (en) * 1990-05-01 1992-01-08 Jaguar Cars Vehicle lamps

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Publication number Publication date
DE59307195D1 (en) 1997-10-02
DE4224865A1 (en) 1994-02-03
EP0581048A1 (en) 1994-02-02

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