Flood lens used for LED (light emitting diode) light source

Abstract

The invention relates to a flood lens used for an LED light source. The flood lens is a rotary body; a columnar blind hole for arranging the LED light source is formed on the bottom surface of the lens; the bottom of the blind hole has a conical surface; the axis of the blind hole is superposed with that of the lens; the axis of the conical surface is superposed with that of the lens; and the side surface of the lens is a total reflection surface. By forming the blind hole with the bottom conical surface on the bottom of the lens, the light emission angle of the emergent light can be enlarged by refracting light from the LED light source with smaller light emission angle by the conical surface and then refracting to outside by the top surface. Accordingly, the flood lens solves the problem that the near axis part of the LED light source has larger light intensity, thereby realizing more uniform flood light distribution.

Description

technical field [0001] The invention relates to a light distribution lens for an LED light source, more specifically, to a floodlight lens for an LED light source. Background technique [0002] When LED light sources are used for flood lighting, reflective cups are generally used to distribute light to the LED light source, but the light distribution effect of this method is not very ideal, because the light intensity of the near-axis part of the LED light source is relatively large, but this Part of the light cannot be distributed through the reflector, so the floodlight distributed by the reflector will always have a high light intensity in the middle. [0003] In order to obtain a more uniform floodlight distribution, there are also concave lenses used to distribute light to the LED light source, but this method has a relatively low utilization rate of the luminous flux of the LED light source, which means that the light with a large luminous angle of the LED light source...

AI Technical Summary

Problems solved by technology

[0002] When LED light sources are used for flood lighting, reflective cups are generally used to distribute light to the LED light source, but the light distribution effect of this method is not very ideal, because the light intensity of the near-axis part of the LED light source is relatively large, but this Part of the light cannot be distributed through the reflector, so the floodlight distributed by the reflector will always have a higher light intensity in the middle

[0003] In order to obtain a more uniform flood light distribution, there are also concave lenses used to distribute light to the LED light source, but this method has a relatively low utilization rate of the luminous flux of the LED light source, which means that the light with a large luminous angle of the LED light source cannot be used. , resulting in too low light efficiency utilization of lamps

[0004] In addition, there is also a type of floodlight lens, which is improved on the basis of the concentrating total reflection lens of the LED light source, such as figure 1 As shown, the exit surface 1 of the lens is made into a dense network of small bumps or pits to achieve the effect of floodlight, and some of the exit surface is frosted. The floodlight effect achieved by these treatment methods is not uniform enough. The light angle is generally small, and due to the frosted or frosted exit surface, the light loss

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