The gas-discharge light sources used until recently in vehicle headlamps and the entire lighting systems have some intrinsic deficiencies, such as the light emission wavelength not fitted to the eye sensitivity and high light scattering at the reflecting surfaces that can increase the dazzling effect for drivers of the approaching vehicles. This problems impose the need of automatic correction devices. In view of these deficiencies, the purpose of the study presented in the paper is to design a multiple-purpose headlamp with improved lighting properties, permitting the use of any light source, including LEDs, and eliminating the intrinsic deficiencies of gas-discharge lamps. The researches demonstrated that the suggested design of a headlamp with a fiber-optic image converter allows to overcome the above deficiencies and at the same time to maintain the high degree of unification when manufacturing headlamps for different applications. In addition, various kinds of light sources and plastic projection optical devices can be used, and the stylistic and ergonomic features of headlamps are improved. The project is based on the unified optical element of vehicle headlamp to produce all necessary head lighting modes (upper, lower and fog lamps) with minimal overall dimensions, weight, power consumption and built-in light beam position control. The above features of the optical element are implemented with a light optic array that uses a fiber-optic image converter (FOIC) to determine the light distribution pattern. The light optic array includes an axis-symmetric ellipsoidal reflector, a light source (headlamp bulb) positioned in line with the reflector optical axis in the region of its first focal point and shifted forward along the axis within the luminous element limits, and a fiber-optic image converter representing the shaped concentrator with two working end surfaces.
Headlamps of various purpose with optical fibre image converter
Mehrzweck-Scheinwerfer mit Lichtleiterfaser-Bildwandlern
2005
13 Seiten, 8 Bilder, 2 Quellen
Conference paper
English
Brighter headlamps using fibre optics
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