Transparent lampshade and lens module of high-power LED streetlamp

Abstract

The invention discloses a lens module of a high-power LED streetlamp, which comprises a projected spherical surface similar to a semielliptical surface. The bottom of the projected spherical surface is connected with a planar bottom plate, a hollow spherical surface groove similar to a semielliptical surface is arranged at the center of the bottom of the projected spherical surface, the projected spherical surface is divided into a left semi-spherical surface and a right semi-spherical surface by centering the long axis, and a smooth-transition groove is arranged at the center of the left spherical surface. The long axis of the projected spherical surface is parallel to the short axis of the hollow spherical surface groove, and the distance delta d between projections on the horizontal plane of the two axes is larger than zero. All 180-degree light emitted from LED chips can be collected by a lampshade designed by fully-refractive secondary optical lens and can be redistributed to the assigned areas. Far-field angular distribution of light intensity of the LED streetlamp can be in bat wing distribution and light spot can be rectangular by the aid of light distribution of free curved surfaces, and further, the middle and the edges of the rectangular light spot can be more uniform, light cutting design of the lens can be realized and flare can be eliminated by means of the principle of marginal light rays.

Description

technical field [0001] The invention relates to a transparent lampshade and a lens module of a high-power LED street lamp. Background technique [0002] Secondary optical design is an important technology to determine the light distribution curve, output light effect, uniformity, and glare index of LED street lamps. The luminosity distribution of most high-power white LEDs on the market is Lambertian distribution, the light spot is circular, and the full width of the beam angle at half of the peak light intensity is about 120°. Secondary optics is an important link that directly determines the output efficiency, light distribution, uniformity and glare degree of LED street lights. Green and environmentally friendly urban road lighting requires LED street lights to produce rectangular light spots that just cover the road, and to minimize light pollution to other places other than the road. In order to make the light emitted by high-power LED street lamps both uniform and hi...

AI Technical Summary

Problems solved by technology

In the prior art, a simple cylindrical lens is often used to convert the hemispherical surface light source into a rectangular surface light source. Although the light emitted by it is projected into a rectangular light area, the light is not uniform. The patent document CN100549503C discloses an improvement The high-power LED street lampshade composed of special-shaped lenses can make use of the law of refraction and reflection of light to make the light of different angles emitted by the hemispherical light source pass through different refraction and reflection channels, and finally project them uniformly in a rectangular area. better

However, the special-shaped transparent structure used in this patent is relatively complicated, and the processing is difficult, resulting in high production costs.

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