innovative lighting systems

7/31/2019 Innovative Lighting Systems

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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.



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.



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.



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.



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.



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.



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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