Floodlight total-reflection lens

Abstract

The invention relates to a floodlight total-reflection lens, which is used for light distribution of an LED light source, wherein the lens is a revolution body, the bottom surface of the lens is provided with a cylindrical blind hole for arrangement of the LED light source, the bottom of the blind hole is provided with a first conical surface, the axis of the blind hole is coincided with the axis of the lens, and the axis of the first conical surface is coincided with the axis of the lens; and the top surface of the lens is a concave spherical surface, and the sphere center of the concave spherical surface is positioned on the axis of the lens. According to the invention, the bottom of the blind hole on the bottom surface of the flood total-reflection lens is provided with the first conical surface, the top surface of the lens is the concave spherical surface, light with smaller light emitting angle of the LED light source is refracted by the first conical surface, refracted by the concave spherical surface again and then emitted, the light emitting angle of the emergent light is enlarged through twice refraction and amplification, and the light is scattered more uniformly, thus the problem that the light intensity at the axis approaching part of the LED light source is larger is solved, and more uniform floodlight distribution can be realized.

Description

technical field [0001] The invention relates to a light distribution lens used for LED light sources, more specifically, to a floodlight total reflection lens used for light distribution of LED light sources. 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...

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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 another type of floodlight total reflection lens, which is improved on the basis of the light-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 floodlight effect, and some 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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