LED (Light Emitting Diode) lamp and light distribution lens thereof

Abstract

The invention relates to a light distribution lens. The light distribution lens comprises a bottom surface, a top surface and a lens side wall, wherein the lens side wall is used for connecting the bottom surface with the top surface; the inner side of the lens side wall is a fourth surface, which is a total reflection surface; the bottom surface is inwards depressed to form a cylindrical hole, the bottom part of the cylindrical hole is outwards protruded to form a first surface, the first surface is a free curved surface and the side wall of the cylindrical hole is a second surface; the top surface comprises a plurality of convex units, the plurality of convex units form a third surface; light is incident respectively through the first surface and the second surface; after the light is refracted and is totally reflected by the fourth surface, the light shoots the top surface along a direction approximately perpendicular to the top surface; each convex unit can project the incident light to an illuminating area which is approximately circular to form a circular light spot; the entire illuminating area is formed by the circular light spots projected by the plurality of convex units and overlapped in the illuminating area. Therefore, the light distribution lens can realize light field overlapped illumination and the illumination uniformity is higher. Besides, the invention further provides an LED lamp.

Description

technical field [0001] The invention relates to lighting technology, in particular to an LED lamp and a light distribution lens thereof. Background technique [0002] LED has become a competitive new light source in the 21st century with its advantages of all solid state, high luminous efficiency, pure chromaticity, low energy consumption, long life, and no pollution. With the continuous improvement of LED luminous flux and luminous efficiency, the application of LED in the field of lighting is becoming more and more extensive. However, since the LED chip itself belongs to the semi-space Lambertian type of light emission, its luminous intensity is low on both sides and high in the center, so it cannot be directly applied to the field of lighting. [0003] In traditional LED lamps, lenses and reflectors are generally used for secondary light distribution of LED chips. The shape of the lens or reflector is designed through non-imaging optics, and the light angle of the LED ch...

AI Technical Summary

Problems solved by technology

However, the traditional secondary light distribution usually makes the illuminance uniformity of the illuminated surface low, showing a Gaussian type with high middle and low surrounding, and uneven light distribution.

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