6 October 1999 Design optimization of a smooth headlamp reflector to SAE/DOT beam-shape requirements
Author Affiliations +
Abstract
The optical design of Ford Motor Company's 1992 Mercury Grand Marquis headlamp utilized a Sylvania 9007 filament source, a paraboloidal reflector and an array of cylindrical lenses (flutes). It has been of interest to Ford to determine the practicality of closely reproducing the on- road beam pattern performance of this headlamp, with an alternate optical arrangement whereby the control of the beam would be achieved solely by means of the geometry of the surface of the reflector, subject to a requirement of smooth-surface continuity; replacing the outer lens with a clear plastic cover having no beam-forming function. To this end the far-field intensity distribution produced by the 9007 bulb was measured at the low-beam setting. These measurements were then used to develop a light-source model for use in ray tracing simulations of candidate reflector geometries. An objective function was developed to compare candidate beam patterns with the desired beam pattern. Functional forms for the 3D reflector geometry were developed with free parameters to be subsequently optimized. A solution was sought meeting the detailed US SAE/DOT constraints for minimum and maximum permissible levels of illumination in the different portions of the beam pattern. Simulated road scenes were generated by Ford Motor Company to compare the illumination properties of the new design with those of the original Grand Marquis headlamp.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Narkis E. Shatz, Narkis E. Shatz, John C. Bortz, John C. Bortz, Mahendra S. Dassanayake, Mahendra S. Dassanayake, } "Design optimization of a smooth headlamp reflector to SAE/DOT beam-shape requirements", Proc. SPIE 3781, Nonimaging Optics: Maximum Efficiency Light Transfer V, (6 October 1999); doi: 10.1117/12.368246; https://doi.org/10.1117/12.368246
PROCEEDINGS
20 PAGES


SHARE
RELATED CONTENT

A novel optimization strategy for LED street lamp designing
Proceedings of SPIE (December 30 2013)
Headlamps for light based driver assistance
Proceedings of SPIE (April 27 2008)
Fiber Optic Road Signs
Proceedings of SPIE (March 31 1973)
New design tools for LED headlamps
Proceedings of SPIE (April 27 2008)
The Photometry Of Retroreflectors
Proceedings of SPIE (April 03 1979)
A study of optical design of backlight module with external...
Proceedings of SPIE (September 21 2011)

Back to Top