EP0717233B1 - Réflecteur en matière thermoplastique pour projecteur en particulier à coupure de véhicules automobiles - Google Patents

Réflecteur en matière thermoplastique pour projecteur en particulier à coupure de véhicules automobiles Download PDF

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Publication number
EP0717233B1
EP0717233B1 EP95402779A EP95402779A EP0717233B1 EP 0717233 B1 EP0717233 B1 EP 0717233B1 EP 95402779 A EP95402779 A EP 95402779A EP 95402779 A EP95402779 A EP 95402779A EP 0717233 B1 EP0717233 B1 EP 0717233B1
Authority
EP
European Patent Office
Prior art keywords
aperture
reflector
reflector according
base
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
EP95402779A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0717233A1 (fr
Inventor
Eric Nowak
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.)
Valeo Vision SAS
Original Assignee
Valeo Vision SAS
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 Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP0717233A1 publication Critical patent/EP0717233A1/fr
Application granted granted Critical
Publication of EP0717233B1 publication Critical patent/EP0717233B1/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
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • 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
    • F21S45/10—Protection of lighting devices

Definitions

  • the present invention relates to reflectors in thermoplastic material for headlamps in particular with cut-off of motor vehicles.
  • the invention also relates to projectors comprising such reflectors.
  • This projector includes a reflector 1 which supports one or more lamps 2 and which is mounted in a housing 3 closed so watertight with glass 4. Other elements may also be mounted in the housing, for example a hubcap 5.
  • the reflector 1 has been more particularly shown in Figure 2. It is molded in one piece thermoplastic polymer and is metallized, so provide the required reflection properties. Function major of reflector 1 is to return the rays light of the lamp (s) 2 according to the direction of the axis optic A of the projector and generate, thanks to its shape - which is calculated for this purpose - the light beam projected onto the road.
  • the reflector 1 has a functional part 1a, for example of parabolic form, which is the part of the reflector which reflects the beam along the axis optic towards the road. It also includes two cheeks, one upper 1b, the other lower 1c, which constitute connecting parts between the bottom of the functional part 1a, the branches thereof and the ice 4.
  • a functional part 1a for example of parabolic form, which is the part of the reflector which reflects the beam along the axis optic towards the road. It also includes two cheeks, one upper 1b, the other lower 1c, which constitute connecting parts between the bottom of the functional part 1a, the branches thereof and the ice 4.
  • Cheeks 1b and 1c do not participate in the development of the optical beam. They constitute connecting parts, which mainly have a role mechanical.
  • the height of the projector is reduced more and more, so that the upper cheek 1b of the reflector 1, located at plumb with the light source constituted by the lamp 2, is very close to said source.
  • thermoplastic reflectors In the case of thermoplastic reflectors, this rise in temperature is accompanied by a thermal expansion tending to increase circumferentially the dimensions of the upper cheek 1b and to deform the functional part 1a of the reflector, especially by removing the branches thereof. This thermal deformation changes the shape of the projected beam and is particularly responsible for the appearance of portions beam in areas that are normally areas where the beam is cut. The rise in temperature of the upper cheek 1b therefore creates a dazzle, which increases with the duration of lighting of the lamp.
  • FIGs 3 and 4 This glare was illustrated in Figures 3 and 4 in the case of a dipped headlight for right-hand drive.
  • the outline of this beam projected has a V-cut at 15 ° perfectly sharp.
  • the Y axis is a vertical axis in the median plane of the projector.
  • the X axis is an axis in the horizontal beam cut-off plane.
  • This projected beam is deformed compared to that of FIG. 2. It has in its left part an Eb portion above the X axis which dazzles.
  • the invention proposes a material reflector thermoplastic for beam projector, more particularly with cut-off comprising a functional reflection part of general shape curvilinear, as well as a lower cheek and an upper cheek which connect the bottom and branches of the functional part, the upper cheek presenting at least one opening, which extends along most of the branch of the functional part which is on the side of said part functional that is likely to reflect glare beams, characterized in that said opening is offset from the area of the upper cheek intended to be in line with the projector lamp.
  • the reflector 10 shown in FIG. 5 is molded from a reinforced thermoplastic polymer material or no.
  • the interior surface of this reflector 10 is metallic.
  • This reflector 10 has a main part functional 11, as well as an upper cheek 12 and a lower cheek which has not been referenced.
  • the functional part 11 presents for example a parabolic shape, with a bottom 11a and two branches arched 11b.
  • Upper cheek 12 and lower cheek each have a parabolic shape matching the upper or lower end contour of the part functional 11.
  • the optical axis of this reflector 10 has been referenced by A.
  • the bottom 11a of the functional part 11 presents an orifice 13 centered on this axis A for the introduction of the projector lamp to which this reflector corresponds.
  • this projector is for example of the type described that with reference to the Figure 1. It includes in particular a box for the reception of the reflector, as well as a window for reflector closing. In Figure 5, only the ice of the projector has been shown. She was referenced by 19.
  • the reflector shown in Figure 5 is a reflector for right-hand traffic.
  • Its upper cheek 12 has on its side which is on the right (when looking at the projector through the rear) an opening 14, which extends along a most of the straight leg llb of the part functional.
  • the opening 14 is therefore directly in look of the optical zone of the reflector which forms the part of the beam likely to generate glare (part of the left beam for its right-hand traffic).
  • This opening 14 makes it possible to minimize the effects of the thermal expansion of the upper cheek 12 on the functional part 11 of reflector 10, for strongly reduce or even eliminate the glare that appears with the reflectors of the prior art, when extended projector operations.
  • Such an opening 14 makes it possible in particular to mechanically decouple the functional part 11 by relative to said upper cheek 12.
  • this opening 14 absorbs part of the dimensional variation of the upper cheek 12 due to thermal expansion of the thermoplastic polymer. To this end, this opening 14 has a geometry which favors the direction of movement of each of the points of the upper cheek 12 towards a point in the center of said opening.
  • This opening 14 advantageously has a contour general triangular, calculated so as not to modify substantially the overall stiffness of the reflector.
  • the outline of the opening 14 is defined by a base 15 parallel to optical axis A and on two sides 16 and 17, which meet at the right end front 18 of reflector 10.
  • Side 16 is defined by the inner contour upper of the right branch 11b of the part functional 11.
  • Side 17 is linear.
  • the base 15 is advantageously located at a distance 15a from the optical axis A equal to 30 to 40% of the half-width of the reflector 10, at its front face.
  • this opening 14 is produced by machining after molding. In variant, it can also be obtained directly by injection outlet.
  • opening 14 is offset relative to the area to the right of the lamp.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP95402779A 1994-12-12 1995-12-11 Réflecteur en matière thermoplastique pour projecteur en particulier à coupure de véhicules automobiles Expired - Lifetime EP0717233B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9414917A FR2728056A1 (fr) 1994-12-12 1994-12-12 Reflecteur en matiere thermoplastique pour projecteur en particulier a coupure de vehicules automobiles
FR9414917 1994-12-12

Publications (2)

Publication Number Publication Date
EP0717233A1 EP0717233A1 (fr) 1996-06-19
EP0717233B1 true EP0717233B1 (fr) 2001-02-07

Family

ID=9469701

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95402779A Expired - Lifetime EP0717233B1 (fr) 1994-12-12 1995-12-11 Réflecteur en matière thermoplastique pour projecteur en particulier à coupure de véhicules automobiles

Country Status (3)

Country Link
EP (1) EP0717233B1 (enrdf_load_stackoverflow)
DE (1) DE69520065T2 (enrdf_load_stackoverflow)
FR (1) FR2728056A1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10300415A1 (de) * 2003-01-09 2004-07-22 Hella Kg Hueck & Co. Scheinwerfer für Fahrzeuge
JP6195747B2 (ja) * 2012-10-22 2017-09-13 株式会社小糸製作所 灯具ユニット及び車両用灯具

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3106319A1 (de) * 1981-02-20 1982-09-16 Westfälische Metall Industrie KG Hueck & Co, 4780 Lippstadt Kraftfahrzeugscheinwerfer
JPH0617007U (ja) * 1992-08-12 1994-03-04 スタンレー電気株式会社 樹脂リフレクタ

Also Published As

Publication number Publication date
DE69520065T2 (de) 2001-08-23
FR2728056B1 (enrdf_load_stackoverflow) 1997-03-07
FR2728056A1 (fr) 1996-06-14
DE69520065D1 (de) 2001-03-15
EP0717233A1 (fr) 1996-06-19

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