Flood total-reflection lens and LED lamp with same

Abstract

The invention relates to a flood total-reflection lens and an LED lamp with the same. The flood total-reflection lens is provided with a top surface, a bottom surface and a rotary side surface; a hemispherical concave spherical surface is arranged on the bottom surface; a conical concave surface is arranged in the middle of the top surface; and a generating line of the rotary side surface is a broken line, and the broken line comprises six linear segments which are sequentially connected with one another. The LED lamp is provided with the flood total-reflection lens. The concave spherical surface is arranged on the bottom surface of the flood total-reflection lens, the conical concave surface is arranged on the top surface of the flood total-reflection lens, luminous angles are primarily enlarged after small-luminous-angle light rays of an LED light source are refracted by the concave spherical surface, the luminous angles are secondarily enlarged after the light rays are refracted by the conical concave surface on the top surface, and intense light rays close to the axis are diffused to a peripheral environment after secondary refraction, so that the problem of high light intensity of a part of an existing LED light source close to the axis is solved, and uniform flood light distribution can be realized.

Description

technical field [0001] The invention relates to a light distribution lens of a lighting fixture, more specifically, to a floodlight total reflection lens and an LED lighting fixture with the lens. 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 lumin...

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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 convex points or a concave spherical structure 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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