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
  • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
  • F21S41/37—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors characterised by their material, surface treatment or coatings
• • 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
  • F21V7/00—Reflectors for light sources
  • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
  • F21V7/24—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by the material
• • 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
  • F21V7/00—Reflectors for light sources
  • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
  • F21V7/28—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings

Definitions

• the invention relates to a reflector for headlights for vehicles according to the preamble of claim 1.
• Such a reflector is known from EP 0 184 554 AI.
• This reflector has a base body which consists of a base body made of plastic mixed with finely divided filler and a reflective coating applied directly to this base body.
• Plastic is used here as a thermoplastic, which makes it possible to produce the base body with a surface quality such that the reflective coating can be applied to it directly without the interposition of an additional lacquer layer.
• thermoplastic plastics generally have a low heat resistance, so that it cannot be ruled out that a reflector with a base body made of thermoplastic material is deformed by the heat generated during operation of the light source of the headlight. This can lead to the fact that for the existing light regulations no longer be complied with.
• the choice of material for the base body must be made suitable.
• the reflector according to the invention with the features of claim 1 has the advantage that it has good heat resistance due to the base body made of thermosetting plastic and the difficulties explained above are avoided.
• the filler with a pH value between 6 and 8 ensures good resistance of the reflective coating.
• a reflector for a headlight for vehicles, in particular motor vehicles, shown in the figure, consists of a base body 10, which is produced by injection molding or injection molding and subsequently on its concavely curved inner surface 12 directly without intermediate If an additional layer of lacquer were to be applied, a reflective coating 14 would be applied.
• the base body 10 of the reflector consists of a duroplastic, to which finely divided filler and, if appropriate, further additives are admixed.
• the filler has a pH between 6 and 8, preferably between 6.5 and 7.5, in particular about 7, and is therefore chemically neutral.
• the filler has an average particle size of at most 1 ⁇ m and is distributed as evenly as possible in the mass from which the base body 10 is made, before processing and in the finished base body 10.
• the filler is contained in a mass of at least 40% in the mass from which the base body is manufactured.
• the filler is preferably contained in the mass with a weight fraction between 50% and 70%.
• a mixture of different fillers can also be used, in which case the fillers together have the weight proportions of the mass indicated above.
• an unsaturated polyester material such as polyester resin
• the unsaturated polyester resin can be mixed with an addition of low-profile additive, for example in a composition with 70% polyester resin and 30% low-profile additive.
• the proportion of the low-profile additive can be reduced to 0.
• a recipe for the mass from which the base body 10 is produced is given below; for the constituents of the mass, the proportions by weight of the total mass are given: Polyester resin approx. 20 to 30%
• the glass fibers serve to achieve a sufficient mechanical stability of the base body 10.
• the additives serve, for example, among other things to achieve good processability of the mass.
• the mass is in a doughy form and is also referred to as a BMC mass, bulk molding compound.
• epoxy resin is used as the thermosetting plastic, which is present in the form of a free-flowing granulate before processing.
• a recipe for the mass from which the base body 10 is produced is given below; for the constituents of the mass, the proportions by weight of the total mass are given:
• the composition composed as in the above-mentioned exemplary embodiments is mixed and homogenized uniformly before being processed, for example in a roller mill.
• the mass is then shaped into the base body 10 by injection molding or transfer molding in a corresponding tool or mold.
• the tool or the Form has, at least in the region of the concavely curved inner surface 12 of the base body 10, to which the reflective coating 14 is later applied, a small surface roughness, which is preferably at most 0.2 ⁇ m.
• the base body 10 is cured in a known manner in the tool by heating.
• the inner surface 12 of the base body 10 is then cleaned, for example by blowing off or washing.
• the special features explained above that is to say that the average particle size of the filler is at most 1 ⁇ m and that the tool has a low surface roughness, enables the production of the base body 10 with a very low surface roughness on its inner surface 12.
• the surface roughness of the inner surface Surface 12 of the base body 10 is at most 0.3 ⁇ m, preferably at most 0.15 ⁇ m. This high surface quality of the base body 10 enables it to be applied directly to its inner surface 12 without the application of an additional one
• Lacquer layer the reflective coating 14 can be applied.
• the reflective coating 14 is applied to the inner surface 12 of the base body 10 in a known manner.
• the reflective coating 14 is preferably made of aluminum and has a reflectance of at least 90%. Due to the chemical neutrality of the filler, good resistance of the reflective coating 14 is achieved even under the influence of moisture.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Non-Portable Lighting Devices Or Systems Thereof (AREA)
• Optical Elements Other Than Lenses (AREA)
• Laminated Bodies (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6533822

Family Applications (1)

Country Status (11)

Families Citing this family (5)

Citations (3)

Family Cites Families (8)

• 1994
  • 1994-11-22 DE DE4441486A patent/DE4441486C2/de not_active Expired - Fee Related
• 1995
  • 1995-10-19 WO PCT/DE1995/001456 patent/WO1996016295A1/de not_active Application Discontinuation
  • 1995-10-19 HU HU9601990A patent/HU216413B/hu not_active IP Right Cessation
  • 1995-10-19 RU RU96117125A patent/RU2141075C1/ru active
  • 1995-10-19 JP JP8516423A patent/JPH09508235A/ja active Pending
  • 1995-10-19 CZ CZ962024A patent/CZ202496DA3/cs unknown
  • 1995-10-19 BR BR9506554A patent/BR9506554A/pt not_active Application Discontinuation
  • 1995-10-19 KR KR1019960703929A patent/KR970700843A/ko not_active Application Discontinuation
  • 1995-10-19 PL PL95315335A patent/PL178678B1/pl unknown
  • 1995-10-19 EP EP95934617A patent/EP0746723A1/de not_active Withdrawn
  • 1995-10-19 CN CN95191076A patent/CN1137310A/zh active Pending

Patent Citations (3)

Also Published As

Similar Documents

Legal Events