Reflective cup for LED lamp

Abstract

The invention provides a reflective cup for a LED lamp, comprising a reflection surface and a bottom surface; the LED is positioned in the center of the bottom surface, a part of light of the LED is emitted from an opening of the reflective cup directly, the part of light reaches an objective plane to form an initial illumination plane, the other part of light is reflected by the reflective surface of the reflective cup to the initial illumination plane, a uniform lighting plane is formed by the energy overlay of the two parts of light, the reflective surface of the reflective cup is a free surface, the shape of the free surface is determined by the following method: the reflective cup is in central axial symmetric shape, the section crossing the central axis of the reflective cup is taken as a datum plane, coordinates is established, the central axis is Z axis, the original point is on the central axis, the LED light source is positioned at the original point, the direction passing through the original point and is vertical to the central axis is X axis, a curved line on the XZ plane corresponding to the free surface is rotated for 360 degrees around the Z axis, then the shape of the free surface is obtained. The reflective cup of the invention is simple and compact in structure and the LED optical uniformity is good.

Description

technical field [0001] The invention belongs to the field of optical technology and lighting technology, and in particular relates to a reflective cup used for LED lamps. Background technique [0002] As one of the greatest inventions in human history, artificial light source has had a profound impact on the evolution of human civilization, and it has also continued to improve with the development of science and technology. As a new artificial light source, LED has shown a very broad application prospect due to its small size, low energy consumption, good monochromaticity and other advantages. However, there are still many shortcomings in the current LEDs: the total light energy of a single LED is low, and most LED products have a Lambertian distribution luminous curve with a large divergence angle (180°), so they are not suitable for lighting systems alone . In most applications, people need additional optics to cooperate with LEDs to achieve uniform illumination in the i...

AI Technical Summary

Problems solved by technology

However, there are still many shortcomings in the current LEDs: the total light energy of a single LED is low, and most LED products have a Lambertian distribution luminous curve with a large divergence angle (180°), so they are not suitable for lighting systems alone

Although these methods based on the principle of traditional imaging optics solve the problem of achieving uniform illumination in a specific illumination area, due to their own nature limitations, there is a specific collection angle, so they cannot fully utilize the light energy emitted by LEDs.

At the same time, various solutions require a large number of optical components to cooperate with each other to form an optical system to realize their functions, so they are relatively complicated and not suitable for miniaturized systems. However, miniaturization is increasingly becoming a trend. Today, the limitations of traditional homogeneous lighting systems are becoming more and more obvious

Some people also design devices for uniform light based on the principle of non-imaging optics, such as the improved CPC system uniform light method. Although it fully considers uniformity and light energy utilization, it still cannot get rid of the large size of the traditional CPC system, especially the optical axis. The defect of the direction length is too long; recently, LED lamps based on free-form surface lenses have appeared to achieve uniform illumination for a specific area, but the utilization rate of the lens is low, and the device based on refraction will appear dispersion phenomenon, and the light color on the illumination surface is not good. Uniform, with blue light and yellow light appearing

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