Reflection type light projector device

Abstract

The invention is a reflection-type light-projecting device, comprising a light-guiding cover with reflecting characteristic and a directional light source, wherein the light-guiding cover has a reflection surface of Fresnel structure which uses Fresnel lens principle and converts the geometrical reflection surface to an equivalent reflection surface to be a plane, a chamber or a combination, the reflection surface of Fresnel structure is arranged at the bottom of the light-guiding cover, the light source is arranged on the side wall of the light-guiding cover, adjusting the light direction to form a certain engageable angle with the Fresnel structure can make the reflecting light emitted in certain angle from the light-guiding cover, to generate collimated light with high efficiency and high alignment.

Description

technical field [0001] The present invention relates to a light projection device, in particular to a Fresnel lens principle, which converts a geometric reflective surface into an equivalent reflective surface, and cooperates with a light source that controls the luminous angle to produce high efficiency and high collimation. A light projection device for parallel rays. Background technique [0002] The light sources of traditional lamps can be roughly divided into two types: point light sources and line light sources. Tungsten filament lamps and energy-saving bulbs are point light sources, while fluorescent tubes are line light sources. When the above two light sources emit light, they emit light in a radial manner. The disadvantage of emitting outward is that it is large in size. Due to the main advantage of small size, light-emitting diodes (LEDs) have been continuously developed and applied to lighting tools in recent years. Moreover, due to the continuous improvement of...

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Problems solved by technology

[0005] Please refer to FIG. 3, US Patent No. 5,136,483 "Illuminating device", which proposes a vehicle lamp, which includes a reflector 16, a plurality of light-emitting diodes 14 placed flat on the inner annular side wall of the reflector 16, And heat dissipation fin 19, the light that described light-emitting diode 14 sends can produce parallel light through the reflection of the curved surface bottom of reflector 16; A small part can be reflected by the reflector 16 to produce parallel light. As for the light in other light angle ranges, part of it is scattered out of the reflector 16 at undesired light angles, and some of the light is reflected multiple times inside the reflector 16. Therefore, its light extraction efficiency is not good, and it cannot produce highly collimated parallel light rays. Although the above-mentioned problems can be improved by changing the design of the reflector 16, the design is extremely difficult and there is room for improvement. not high

[0006] Please refer to FIG. 4, US Patent No. 5,838,247 "Solid state light system". The lamp 40 disclosed in the patent includes a plurality of light-emitting diodes 12 arranged obliquely, and a reflection mechanism 44 with an inclination angle A. The reflector 44 can be conical or pyramid-shaped, and the light-emitting diode 12 and the reflector 44 can form reflected light parallel to the axial direction 36 by virtue of the cooperation of the inclination angles of the light-emitting diode 12 and the reflector 44, so as to improve the light extraction efficiency, but its disadvantage is that The reflective mechanism 44 described above is a plane, and cannot be accurately matched with the light emitting angle of the light emitting diode 12, so it is still impossible to make all the reflected light emit completely parallel to the axial direction 36. Furthermore, in order to match the inclination of the reflective mechanism 44, it must Installing a large number of light emitting diodes 12 is not only costly and wastes energy, but also leads to an extremely large volume of the lamp, and the appearance of the lamp is also fixed and invariable

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