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Innovative Lighting Systems – Rear Combination Lamp
These days, LEDs are key: Not only are they taking the automotive industry by storm due to
their energy-saving potential, they also offer a level of design versatility that is crucial to
developing a vehicle’s typical appearance. For combination rear lamps especially, manufacturersare exploring the many options available when LEDs are combined with optical systems,
creating attractive and distinctive vehicle designs.1.) Glowing Elements
A diffusely illuminated solid element creates a three-dimensional impression and can be used as
a versatile design feature. A volume spot designed as a glowing element ensures highly
consistent lighting of illuminated surfaces.
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2.) Edge Light
The Edge Light light guide provides a clear signature thanks to its light radiating edge, and
features varying wall thickness depending on the function. In this product, the light from an LED
is coupled into the reverse edge of the Edge Light guide and then runs through the light guide
plate by means of total reflection until it is radiated onto the front edge. An additional lens
structure on the side surfaces makes system depth visible and allows this element to beemphasized.
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3.) Light Curtain
A light curtain is a flat light guide that acts like an auxiliary lens in which one or several edges
couple in the light from the LEDs. The structured surface of the lens radiates the light outward.
A light curtain can be used as a small lens that forms part of a larger arrangement or as a large
additional lens, offering the option of either large-surface or partial illumination.
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4.) Prism Rods
Prism light guides are long rod-like light guides made of PMMA or PC with a typical diameter
of between 7 and 10 mm. The light guides generate homogeneous linear illumination. Each one
is equipped with LEDs at one or both ends. The light from the LEDs is coupled into the light
guide via a coupling-in lens, which sends the light onward via total reflection. Part of the light
meets the whole length of the back of the light guide, where the prisms are positioned; the prismsthen uncouple part of the light from the rod at 90° to its longitudinal axis. This method achieves
extremely consistent illumination along the entire rod.
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5.) Double Reflector
A double reflector system consists of a complex arrangement of reflectors: a larger rear reflector
to generate large-area background lighting, and a central reflector in front of every light source to
generate high-intensity light. Two reflectors are positioned one behind the other for each light
source. The rear reflector picks up the light that is radiated from the light source to the side
and the centrally positioned front reflector picks up the main part of the light from the lightsource.
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6.) Direct Reflector
Highly efficient direct reflector systems are the most common type of optical system. In a direct
reflector system, the light sources are positioned in a directly visible location in the vertex of the
reflector. The system can be placed at any angle (horizontal, vertical or inclined). The structure
of a direct reflector is determined by the distribution and positioning of the LEDs. A specific
section of the reflector is assigned to each LED. If the PCB is inclined, the positions of the LEDsare staggered, the distances between the LEDs vary or varying reflector geometries are used, the
individual sections of the reflector are staggered. The LEDs shine on the rear of the reflector,
which deflects their light toward the light exit.
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7.) Indirect Reflector
An indirect reflector system is an efficient optical system with “invisible” light sources. It can be
placed at any angle (horizontal, vertical or inclined) and equipped with a conventional rigid PCB.
The structure of an indirect reflector is determined by the distribution and positioning of the
LEDs. A specific section of the reflector is assigned to each LED, and individual sections of the
reflector are staggered. The LEDs shine onto the reflector from the side, and the reflectordeflects their light toward the light exit at an angle of about 90°.
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