EP0433840A1 - Projecteur de véhicule automobile - Google Patents

Projecteur de véhicule automobile Download PDF

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Publication number
EP0433840A1
EP0433840A1 EP19900123757 EP90123757A EP0433840A1 EP 0433840 A1 EP0433840 A1 EP 0433840A1 EP 19900123757 EP19900123757 EP 19900123757 EP 90123757 A EP90123757 A EP 90123757A EP 0433840 A1 EP0433840 A1 EP 0433840A1
Authority
EP
European Patent Office
Prior art keywords
cover plate
radiation
light source
motor vehicle
penetrated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19900123757
Other languages
German (de)
English (en)
Other versions
EP0433840B1 (fr
Inventor
Otto Altmann
Wolfgang Huhn
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.)
Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0433840A1 publication Critical patent/EP0433840A1/fr
Application granted granted Critical
Publication of EP0433840B1 publication Critical patent/EP0433840B1/fr
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
    • F21S41/20—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 motor vehicle headlight according to the preamble of patent claim 1.
  • Such a motor vehicle headlight which works according to the projection principle, is known, for example, from DE-PS 3640773.
  • the cover plate is made of glass, since glass has good light transmission and a high scratch resistance.
  • the disadvantage of glass as a production material for the cover plate is its high specific weight. Because of the high specific weight of glass, the cover plate has a significant proportion of the total weight of the motor vehicle headlight in relation to the other components of the motor vehicle headlight.
  • the known motor vehicle headlight is very heavy overall.
  • the invention has for its object to reduce a motor vehicle headlight of the type mentioned in its total weight without sacrificing the advantages of a cover plate made of glass.
  • the part of the cover pane penetrated by the radiation from the light source has a share of only about 27% of the entire cover pane in a conventional headlight.
  • the remaining 73% of the cover plate is practically ineffective for the light utilization, because apart from a negligible percentage, the radiation from the light source penetrates the 27% share of the cover plate.
  • This fact is used for a weight reduction measure in that the 73% of the cover plate is made of a plastic which has a significantly lower specific weight than glass. This reduces the weight of the cover plate of the motor vehicle headlight according to the invention compared to the weight of the cover plate of the known motor vehicle headlight and thus the total weight of the motor vehicle headlight according to the invention.
  • Glass has a much higher scratch resistance than plastic. Since the part of the cover plate penetrated by the radiation from the light source is made of glass, this part has a higher scratch resistance than the part of the cover plate not penetrated by the radiation from the light source. The risk of light being adversely affected by scratches on that part of the cover pane which is penetrated by the radiation from the light source is thus substantially less than in the case of a cover made entirely of plastic.
  • the motor vehicle headlight according to the invention is light and also has the advantages of a motor vehicle headlight with a cover plate made of glass.
  • the construction of the cover plate according to the invention has a further advantage if a high-pressure discharge lamp with low heat radiation is used as the light source.
  • the part of the cover pane which is not penetrated by the radiation from the light source is made of a plastic with a significantly lower thermal conductivity than glass. This results in the thermal insulation of the part of the cover pane penetrated by the radiation of the light source from the other components of the headlight. The heat is not dissipated as quickly from the part of the cover pane penetrated by the radiation from the light source as in the case of the cover plate made entirely of glass of the known motor vehicle headlight.
  • the heat radiation of a high-pressure discharge lamp which is low compared to, for example, a halogen lamp, is sufficient to heat the part of the cover pane penetrated by the radiation from the light source to such an extent that ice and / or snow can be melted off in the cold season.
  • the structural design of the motor vehicle headlamp according to the invention becomes simple if the part of the light source penetrated by the radiation Covering screen is at the same time the projection lens, because then a separate projection lens and thus also a holder for the projection lens in the interior of the motor vehicle headlight, for example through an annular aperture, are dispensed with. This results in a further reduction in the weight of the motor vehicle headlight according to the invention.
  • the part of the cover plate which is not penetrated by the radiation from the light source is made of a transparent plastic, this part can be used as a diffusing plate for the parking light.
  • the view through the cover disk into the headlight interior is prevented by an annular plastic decorative panel which is arranged around the projection lens.
  • the plastic cover can be dispensed with if a metal coating on the side of the cover pane facing the light source does not perform the function of the cover plate, as the radiation from the light source does not penetrate it.
  • the metal coating has a further advantage if a high-pressure discharge lamp is used as the light source. The metal coating then additionally largely shields the electromagnetic radiation emitted by the high-pressure discharge lamp in the direction of the cover plate.
  • the part of the cover pane penetrated by the radiation from the light source and that by the radiation from the Parts of the cover plate which are not penetrated by light source are immovably connected to one another after the production process of the cover plate according to the invention has ended.
  • the part of the cover pane to be produced from plastic and not penetrated by the radiation from the light source can thus be injection molded in a simple manner onto the abutting surface of the part of the cover pane penetrated by the radiation from the light source.
  • the motor vehicle headlight 1 shows a schematic illustration of a motor vehicle headlight 1 with a high-pressure discharge lamp 2, which emits radiation that is not shown in the drawing.
  • the motor vehicle headlight 1 further comprises a reflector 3, which reflects the radiation from the high-pressure discharge lamp 2.
  • the reflected radiation penetrates a part 4 of the cover plate 5 made of glass, which is designed as a projection lens.
  • the part 4 of the cover plate 5 penetrated by the radiation from the high-pressure discharge lamp 2 is surrounded by a part 6 made of transparent plastic. (See also FIG. 2)
  • the side 7 of the part 6 of the cover plate 5 which is not penetrated by the radiation from the high-pressure discharge lamp 2 and which faces the high-pressure discharge lamp 2 is partially provided with a metal coating 8.
  • the area 9 of the part 6 of the cover plate 5 which is not penetrated by the radiation of the high-pressure discharge lamp 2 and which is not provided with the metal coating 8 serves as a parking light diffusing screen. (see also Fig. 2).
  • FIG. 2 shows the cover plate 5 of the motor vehicle headlight from FIG. 1 from viewing direction A.
  • FIG. 3 shows the interlocking profiles of the abutting surfaces between the part 4 of the cover plate 5 penetrated by the radiation from the high-pressure discharge lamp 2 (FIG. 1) and the part 6 of the cover plate 5 not penetrated by the radiation from the high-pressure discharge lamp 2 (FIG. 1).
  • the part 4 of the cover plate 5 which is penetrated by the radiation from the high-pressure discharge lamp 2 has a share of 27% in the entire cover plate 5.
  • the remaining part of 73% is almost ineffective for the use of light, since the radiation from the high-pressure discharge lamp except for a vanishingly small percentage 2 part 4 of the cover plate 5 passes.
  • the remaining 73% of the cover plate 5 is made of a plastic with a significantly lower specific weight than glass.
  • the total weight of the cover plate 5 of the motor vehicle headlamp according to the invention is substantially less than that of a cover plate made entirely of glass. Overall, this results in a lower total weight of the motor vehicle headlight according to the invention compared to the known headlight.
  • the high-pressure discharge lamp 2 When the high-pressure discharge lamp 2 is switched on, the radiation emitted by it with a wide frequency spectrum, not shown in the drawing, strikes part 4 of the cover plate 5 partially and partly reflects it from the reflector 3. The radiation passes through part 4 of the cover plate 5, which at the same time passes through the projection lens is. Part 4 of the cover plate 5 is heated by the heat radiation contained in the radiation from the high-pressure discharge lamp 2. The low heat radiation of the high-pressure discharge lamp 2 is sufficient to heat part 4 of the cover plate 5 so much that any snow and / or ice layer that may be present on it is melted.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP90123757A 1989-12-21 1990-12-11 Projecteur de véhicule automobile Expired - Lifetime EP0433840B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3942310 1989-12-21
DE3942310A DE3942310A1 (de) 1989-12-21 1989-12-21 Kraftfahrzeug-scheinwerfer

Publications (2)

Publication Number Publication Date
EP0433840A1 true EP0433840A1 (fr) 1991-06-26
EP0433840B1 EP0433840B1 (fr) 1994-03-16

Family

ID=6396032

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90123757A Expired - Lifetime EP0433840B1 (fr) 1989-12-21 1990-12-11 Projecteur de véhicule automobile

Country Status (3)

Country Link
EP (1) EP0433840B1 (fr)
DE (2) DE3942310A1 (fr)
ES (1) ES2050922T3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4224865A1 (de) * 1992-07-28 1994-02-03 Bayerische Motoren Werke Ag Kraftfahrzeug-Scheinwerfer
US5567034A (en) * 1992-07-28 1996-10-22 Bayerische Motoren Werke Ag Motor vehicle headlamp
DE19807409A1 (de) * 1998-02-21 1999-08-26 Volkswagen Ag Scheinwerfer oder Leuchte

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19811570C2 (de) * 1998-03-17 2001-08-02 Volkswagen Ag Fahrzeugscheinwerfer mit einem Gehäuse und einer Lichtscheibe für eine blendfreie Signalbildfunktion
DE10027981A1 (de) * 2000-06-06 2001-12-13 Volkswagen Ag Scheinwerfer mit Standlicht
DE10335876B4 (de) * 2003-08-06 2010-07-22 GM Global Technology Operations, Inc., Detroit Leuchtenanordnung und Verfahren zur Herstellung
DE102011052552A1 (de) * 2011-08-10 2013-02-14 Hella Kgaa Hueck & Co. Scheinwerfer für Fahrzeuge

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB290029A (en) * 1927-04-21 1928-05-10 Alfred Parton Improvements in motor vehicle headlights and other light projecting devices
EP0094519A2 (fr) * 1982-05-18 1983-11-23 Hella KG Hueck & Co. Projecteur non-éblouissant pour véhicule
DE8535948U1 (de) * 1985-01-08 1986-02-13 Carello Industriale S.p.A., Turin Frontscheinwerfer für Kraftfahrzeuge
DE3633662A1 (de) * 1986-10-03 1988-04-14 Hermann Hablitzel Streuscheibe fuer frontscheinwerfer o.dgl. zum einbau in fahrzeuge

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2436934A1 (fr) * 1978-09-21 1980-04-18 Seima Bloc optique, notamment pour projecteur automobile
DE8427338U1 (de) * 1984-09-17 1984-12-13 Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart Projektionsscheinwerfer fuer kraftfahrzeuge
DE3640773A1 (de) * 1986-11-28 1988-06-09 Hella Kg Hueck & Co Scheinwerfer fuer fahrzeuge nach dem projektionsprinzip
DE3703129A1 (de) * 1987-02-03 1988-08-11 Hella Kg Hueck & Co Scheinwerfereinheit fuer fahrzeuge

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB290029A (en) * 1927-04-21 1928-05-10 Alfred Parton Improvements in motor vehicle headlights and other light projecting devices
EP0094519A2 (fr) * 1982-05-18 1983-11-23 Hella KG Hueck & Co. Projecteur non-éblouissant pour véhicule
DE8535948U1 (de) * 1985-01-08 1986-02-13 Carello Industriale S.p.A., Turin Frontscheinwerfer für Kraftfahrzeuge
DE3633662A1 (de) * 1986-10-03 1988-04-14 Hermann Hablitzel Streuscheibe fuer frontscheinwerfer o.dgl. zum einbau in fahrzeuge

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4224865A1 (de) * 1992-07-28 1994-02-03 Bayerische Motoren Werke Ag Kraftfahrzeug-Scheinwerfer
US5567034A (en) * 1992-07-28 1996-10-22 Bayerische Motoren Werke Ag Motor vehicle headlamp
DE19807409A1 (de) * 1998-02-21 1999-08-26 Volkswagen Ag Scheinwerfer oder Leuchte

Also Published As

Publication number Publication date
EP0433840B1 (fr) 1994-03-16
DE59005010D1 (de) 1994-04-21
DE3942310A1 (de) 1991-06-27
ES2050922T3 (es) 1994-06-01

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