A kind of led secondary lens and led lamp

Abstract

The invention discloses an LED secondary lens and an LED lamp. The LED secondary lens comprises a first lens body and a second lens body arranged on the first lens body. The first lens body comprises a bottom face and a first outer curved face located on the upper portion of the bottom face. The middle of the bottom face of the fist lens body is concave upwards and inwards to form a first inner curved face. The second lens body comprises a second inner curved face making contact with the first outer curved face of the first lens body and a second outer curved face located above the second inner curved face. The first outer curved face and the second outer curved face are each a curved face with the downwards and inwards concave middle and the outwards convex periphery. By the adoption of the double-layer lens structure, light is refracted at least three times through the secondary lens, incident light is more disperse, and chromatic aberration and yellow spot phenomena are avoided. The curvature of the first inner curved face, the curvature of the first outer curved face and the curvature of the second outer curved face are adjusted according to the light emitting characteristic of an LED chip, light brightness and color uniformity are optimized greatly, and the quality of a backlight module is improved.

Description

technical field [0001] The invention relates to the field of optoelectronics, in particular to an LED secondary lens and an LED lamp. Background technique [0002] In the direct-type backlight module, the light emitted by the LED light-emitting chip is distributed through the secondary lens to form a uniform light spot, and multiple light spots formed by multiple LED light-emitting chips are superimposed on the diffusion plate, so as to achieve the direct-down backlight module. Luminance and chromaticity uniformity requirements. [0003] The secondary lens and the LED light-emitting chip are two independent objects, but they are inseparable. Its main function is to converge the angle of light emitted by the LED light-emitting chip into any desired angle between 5° and 160°, forming a uniform spot. The material of the secondary lens is generally optical-grade PMMA material or PC material; in special cases, glass can be selected, and its refractive index is greater than that...

AI Technical Summary

Problems solved by technology

With the current trend of direct-type backlight modules getting thinner and thinner, and the number of LED light-emitting chips getting smaller and smaller, the light emitted by the LED light-emitting chips is incident on the diffuser plate through a single-layer secondary lens, and it is easier to form a "yellow spot". and the phenomenon of light and shadow

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