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      Rearlighting technology by Marelli Automotive Lighting

      Rearlighting – basic optical principles

      The light pattern of a LED-chip, distributed in an angle of 180°, needs to be captured, focused, reoriented and distributed towards other traffic partners.

      As optical elements we may use simple or numerically calculated reflexion surfaces, Fresnel optics, prismatic lenses, different kinds of light guides such as tubes, bars or curtains. For the final distribution of the beam pattern we apply surfaces of frozen appearance or over-molded film layers.

      These optical concepts generate together with the outer shape the dedicated lamp appearance.

      From technology to aesthetics

      3D-elements

      with 20 + 20 LEDs

      LEDs on a flat rigid (2D) electronic board provide the opportunity to apply deep optical elements generating a tree-dimensional appearance (3D) of the product.


      Energy consumption: 11 Watt
      Luminous flux: 40 lm
      Optical efficiency: 12–18 %

      Mirror Effect

      with 6 + 6 LEDs

      Retro-reflective inner lenses behind a semi-transparent outer lens create a mirror effect reflecting several times the appearance of a light emitting element.


      Energy consumption: 6 Watt
      Luminous flux: 36 lm
      Optical efficiency: 3–7 %

      Slit design

      with 17 + 18 LEDs

      Light sources sitting behind a partially transparent inner optics create a very slim slity appearance. Those zones are relatively free for design application.


      Energy consumption: 13 Watt
      Luminous flux: 105 lm
      Optical efficiency: 7–13 %

      Film technology

      with 2x33 + 3 LEDs

      Thick 3-dimensional transparent plastic parts with thin film surface provide the opportunity for creating homogeneous thick elements within taillamps.


      Energy consumption: 5 Watt
      Luminous flux: 138 lm
      Optical efficiency: 3–7 %

      Light curtain

      with 3 LEDs

      LEDs are feeding into the outer contour of a lightguide. Flat zones with free graphical design opportunities provide a semi-transparent impression: ?light curtain“.


      Energy consumption: 2.5 Watt
      Luminous flux: 36 lm
      Optical efficiency: 5–11 %

      Light bars

      with 3 + 3 LEDs

      LED light sources fire laterally into a three-dimensional light guide with surface optics creating the design appearance of a thick light bar.


      Energy consumption: 3 Watt
      Luminous flux: 36 lm
      Optical efficiency: 3–7 %

      Light tubes

      with 2 + 2 LEDs

      Longitudinal light guides with axial circular shape. Intersections on rear side of the tube ensure outcoupling toward the observing eye on the outside.


      Energy consumption: 2.5 Watt
      Luminous flux: 24 lm
      Optical efficiency: 12–18 %

      Shell reflectors

      with 12 LEDs

      LED light source emit their beam towards a shell-like shaped reflector with defined optical surfaces. Those shell reflectors generate the light distribution.


      Energy consumption: 9 Watt
      Luminous flux: 144 lm
      Optical efficiency: 20–30 %

      Dot design

      with 18 + 12 LEDs

      The LEDs are sitting axial within small tulip-shaped reflector units generating a spotty appearance towards the observer.


      Energy consumption: 8 Watt
      Luminous flux: 30 lm
      Optical efficiency: 20–30 %

      Prismated optic

      with 9 + 9 LEDs

      Lenses with prismatic surface sitting between the light source, the primary optical element and the observing eye are creating a crystal appearance of the function.


      Energy consumption: 14 Watt
      Luminous flux: 216 lm
      Optical efficiency: 20–30 %

      Light sources

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