Light distribution lens for LED street lamp

Abstract

The invention relates to a light distribution lens for an LED street lamp. An LED comprises an LED chip, a packaged lens packaged together with the LED chip and an optical axis; and the lens comprises a continuous saddle-shaped light distribution curved surface, a concave semi-sphere and a connecting plane, wherein the light distribution curved surface is symmetrical about the optical axis and used for distributing Lambertian distribution light emitted from the corresponding LED chip into large-angle bat-wing light intensity distribution along the length direction of a road; the concave semi-sphere is positioned at the bottom of the lens and symmetrical about the optical axis and the shape of the concave semi-sphere is matched with that of the corresponding LED packaged lens; and the connecting plane is positioned at the bottom of the lens and used for connecting the light distribution curved surface and the semi-sphere. The lens can distribute Lambertian distribution light emitted from the corresponding LED chip into large-angle bat-wing light intensity distribution along the length direction of the road to form oblong light spots along the length direction of the road. Therefore, the utilization ratio of light rays is enhanced, the intensity of illumination on a road surface between street lamps is enhanced and road surface illumination becomes uniform.

Description

technical field [0001] The invention relates to the non-imaging optical technology of LED lighting, more specifically, to a light distribution lens for LED street lamps. Background technique [0002] The development of LED (Light Emitting Diode, light-emitting diode) technology has opened up a new era of lighting technology revolution. Because LED has many advantages such as small size, long life, high electro-optical efficiency, environmental protection and energy saving, LED street lighting technology has developed rapidly in recent years. Since the radiation angle distribution of most LED light sources is a Lambertian distribution (Lambertian distribution) of 110 degrees to 120 degrees, if there is no light distribution, the light pattern on the ground will be a large circular spot, about 50% of the light scattered outside the road is not utilized, and it will cause glare to distant vehicles or pedestrians, which does not meet the requirements of road lighting. Good roa...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a light distribution lens for LED street lamps, which can increase the distance between street lamps, in view of the defects in the prior art that the light utilization rate of LED street lamps is low, and the distance between lamps and lanterns makes the road surface uneven. The illuminance on the road surface makes the road surface lighting become very uniform

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