Illumination – Supported by vehicle structure – Condition responsive
Patent
1997-05-19
2000-03-14
Hafiz, Tariq R.
Illumination
Supported by vehicle structure
Condition responsive
39550001, 362522, 362309, 362338, 362545, 362516, 356124, 35613904, 359727, 359742, G06F 1750, H01L 3300, B60Q 144
Patent
active
060383879
ABSTRACT:
A method for precise design of light distribution for lighting equipment that use light-emitting devices, and for subsequently producing such equipment. By modeling the internal structure of an LED device with respect to the geometry and characteristics of a chip portion, chip reflector and lens portion, illuminating light from an LED device is classified into direct light from the chip portion and the reflected light from the chip reflector. The unknown values necessary for the modeling are specified preliminarily by actual measurements. Subsequently, the original geometry of the lens step is determined roughly based on the target direction and the diffusion angle of the light transmitted through the step. The manner in which the direct light from the chip portion and the reflected light from the chip reflector are transmitted through the lens portion and the lens step is simulated by ray tracing. In addition, the distribution of light is determined and evaluated for its compliance with a desired distribution. If necessary, the geometry of the lens step is modified in accordance with the results of the simulation and the evaluation of light distribution.
REFERENCES:
patent: 4862330 (1989-08-01), Machida et al.
patent: 4951179 (1990-08-01), Machida
Mark Hodapp, Backlighting Automotive Telltales with LED Indicators, SAE Technical Paper Series, Feb. 26-Mar. 2, 1990.
Mark Hodapp, Using LED Indicators for Automotive Telltales pp. 33-40.
Dam Tuan Q.
Hafiz Tariq R.
Koito Manufacturing Co. Ltd.
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