Special-shaped lens and high power LED road lamp shade

Abstract

The invention relates to a lens, in particular to a special shape lens and a large-power LED street lampshade. The special shape lens includes a reversed semi-ellipsoidal-like stage, a hollow spherical plane with a radius R arranged at the center of the lower plane of the reversed semi-ellipsoidal-like stage, and a hyperboloid-like surface with a certain thickness arranged on the upper part of the reversed semi-ellipsoidal-like stage in a position corresponding to the lower plane, wherein the outer concave surface of the hyperboloid-like surface is connected with the reversed semi-ellipsoidal-like stage, and the inner convex surface of the hyperboloid-like surface includes a convex surface having a planar injection similar to rectangle; four wedge-shaped bumps are symmetrically arranged on the side faces of the reversed semi-ellipsoidal-like stage; and annular inner-spherical incident light grooves with unequal cross sections are arranged on the hollow spherical plane. The low-power LED street lampshade includes a shade cover and frames arranged at the periphery, wherein the shade body is composed of a certain number of the special shape lenses arranged in matrix according to a certain rule. The invention provides the special shape lens for converting a semi-spherical light source into a rectangular area light source and the large-power LED street lampshade.

Description

(1) Technical field: [0001] The invention relates to a lens, in particular to a special-shaped lens and a high-power LED street lamp cover. (two), background technology: [0002] At present, the lampshades of high-power LED street lamps mainly have two structures, one is made of flat or curved glass, this kind of lampshade is due to the relatively large divergence angle of the LED light-emitting tube (generally 140 degrees), and the light spots emitted are relatively scattered, making large The brightness of light illuminated by high-power LED street lights on the road is not enough. The other is that a convex lens is placed under each LED light-emitting tube. This lampshade is limited by the divergence angle of the convex lens, and the light spot formed is relatively small and circular. The light spot, the place where it is illuminated is relatively bright, and the place that is not illuminated is no light, the brightness is very uneven, and its structure is extremely compl...

AI Technical Summary

Problems solved by technology

[0002] At present, the lampshades of high-power LED street lamps mainly have two structures, one is made of flat or curved glass, this kind of lampshade is due to the relatively large divergence angle of the LED light-emitting tube (generally 140 degrees), and the light spots emitted are relatively scattered, making large The brightness of light illuminated by high-power LED street lights on the road is not enough. The other is that a convex lens is placed under each LED light-emitting tube. This lampshade is limited by the divergence angle of the convex lens, and the light spot formed is relatively small and circular. The light spot, the place where it is illuminated is relatively bright, and the place that is not illuminated is no light, the brightness is very uneven, and its structure is extremely complicated; in order to facilitate the driving of vehicles, there is a need on the market for a light-gathering effect and a large-scale light spot. The light emitted by the power LED street light is evenly projected on the lampshade in the middle of the road

To make the light emitted by high-power LED street lights uniform and high-intensity, a special lens should be used to project the light emitted by each high-power LED light-emitting tube into a rectangular light area, that is, to convert the hemispherical light source into a rectangular surface. Light source, in the prior art, the conversion of hemispherical surface light source into rectangular surface light source mostly adopts simple cylindrical lens, although the light emitted by it is projected into a rectangular light area, but its light is not uniform, and the announcement number: CN 2746410Y and announcement number : Two kinds of improved cylindrical lenses disclosed by CN 2733381Y, although their performance is better, they are all designed for linear light source, very unsuitable for hemispherical light source

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