The aim of the project presented in the paper has been the development of an innovative solution for ultra thin rear lighting devices in order to reduce the intrusion of their housing in the car body. This objective has been pursued by the integration of LED sources with micro lenses, using the COB technology. The COB technology proposed differs from the S.M.D.(Surface Mounted Device) consolidated technology for the use of the semiconductor light sources chipLED, directly integrated on the PCB substrate instead of the already packaged discrete components, we usually call LED. The chipLED rear lighting system, is the result of a Fiat Auto Innovation Project with the collaboration of CRF (Fiat Research Centre) and its oriented branch CRP (Centro Ricerche Plast-Optica). The complete system has a maximum thickness of 20mm (external lens included) and integrates all rear lighting functions; the photometric performance of the prototype is the same of the traditional rear light with incandescent bulbs. The optical system of the device consists of a multiplicity of elementary cells containing at least one chipLED die (0,3 mm x 0,3 mm) and a miniaturised collimator generating the photometric distribution according to the regulations, A second prismatic lens, placed in front of the collimator compensates for the curvature and the slant with respect to the axis of the car. The proposed innovation performs all the advantages typical of the 'traditional' LED devices, in terms of reliability, safety, lead-time, stylistic opportunities, weight & power saving, and better thickness reduction at a lower cost.
The chip on board LED with micro- optics for an ultra thin rear light
Die Chip-On-Board-LED mit Mkrooptik für eine sehr schmale Rückleuchte
2005
11 Seiten, 6 Bilder
Conference paper
English