Secondary optical lens

Abstract

The present invention relates to the LED lighting engineering, in particular to a double optical lens used on a LED street lamp. The double optical lens is characterized in that a base level is provided, and the base level is a plane; a light outgoing face of the lens consists of two partial sphere surfaces and a transition surface between the two partial sphere surfaces; the light outgoing face communicates with the base level to define the outline of the base level; the center of the base level is provided with a light entering face, which is a concave face; the base level, the light entering face, and the light outgoing face together define the body of the double optical lens; the double optical lens also includes a pair of buckle hooks arranged on the base level of the body, the pairs of buckle hooks is respectively arranged on the two vertical edges of the base level; the hook points of the buckle hooks extend out of the base level along the base level; the obverse face of the hook points, namely the face facing to the light outgoing face is the first plane, and the first plane is parallel to the base level. The reverse face of the hook points, namely the face keeping away from the light outgoing face is the second plane, and the second plane is an inclined plane relatively to the first plane. The end extending out of the base level of the second face is the low end.

Description

technical field [0001] The invention relates to LED lighting technology, in particular to a secondary optical lens for LED street lamps. Background technique [0002] In LED lighting technology, in order to improve the light output efficiency of LED and facilitate use, it is generally necessary to package the LED chip once, such as using a ball lens packaging method. For specific applications, such as LED street lighting, it is required to irradiate light intensively in order to form the required light spot, so it is necessary to perform secondary optical treatment on the LED chips (generally called LED bulbs) after primary packaging. The processing method in the prior art is to install a common secondary lens in front of a group of LED light bulbs to achieve the purpose of concentrating light. Using this method for secondary treatment, because a distance must be preset between the LED bulb and the secondary lens, the light entering the secondary lens is already stray light...

AI Technical Summary

Problems solved by technology

This method is used for secondary treatment, because a distance must be preset between the LED bulb and the secondary lens, and the light entering the secondary lens is already stray light, so the light output rate of the secondary optical treatment is low

On the other hand, the light entering the secondary lens is already stray light, and the shape of the light spot is difficult to control

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