Light distribution lens for LED street lamp

A light distribution lens and LED chip technology, which is applied in the field of non-imaging optics, can solve the problems of uneven lighting on the road surface of lamps and low light utilization rate, and achieve the effect of improving utilization rate, increasing illuminance, and uniform road lighting

Inactive Publication Date: 2010-10-06
THE HONG KONG POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a light distribution lens for LED street lamps, which can increase the distance between street lamps, in view of the defects in the prior a...

Method used

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  • Light distribution lens for LED street lamp
  • Light distribution lens for LED street lamp
  • Light distribution lens for LED street lamp

Examples

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Embodiment Construction

[0046] like Figure 5 and Image 6 As shown, the LED street lamp of the present invention includes: a circuit board (not shown), a plurality of LEDs 4 connected to the circuit board, and a light distribution lens 5 covering a single LED 4 . The LED 4 includes an LED chip 7 and a spherical packaging lens 6 packaged with the LED chip 7 .

[0047] The shape of the lens 5 is as Figure 1-6 As shown, the optical axis OY is included, and the optical axis OY passes through the center of the light-emitting surface of the LED chip 7 and is perpendicular to the light-emitting surface of the LED chip 7 . The lens 5 has a continuous saddle-shaped light distribution curved surface 1, the light distribution curved surface 1 is symmetrical about the optical axis OY, and is not composed of two partial spherical surfaces and a transition surface between the two partial spherical surfaces. 4. The Lambertian distributed light is matched to a batwing-shaped light intensity distribution with a ...

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Abstract

The invention relates to a light distribution lens for an LED street lamp. An LED comprises an LED chip, a packaged lens packaged together with the LED chip and an optical axis; and the lens comprises a continuous saddle-shaped light distribution curved surface, a concave semi-sphere and a connecting plane, wherein the light distribution curved surface is symmetrical about the optical axis and used for distributing Lambertian distribution light emitted from the corresponding LED chip into large-angle bat-wing light intensity distribution along the length direction of a road; the concave semi-sphere is positioned at the bottom of the lens and symmetrical about the optical axis and the shape of the concave semi-sphere is matched with that of the corresponding LED packaged lens; and the connecting plane is positioned at the bottom of the lens and used for connecting the light distribution curved surface and the semi-sphere. The lens can distribute Lambertian distribution light emitted from the corresponding LED chip into large-angle bat-wing light intensity distribution along the length direction of the road to form oblong light spots along the length direction of the road. Therefore, the utilization ratio of light rays is enhanced, the intensity of illumination on a road surface between street lamps is enhanced and road surface illumination becomes uniform.

Description

technical field [0001] The invention relates to the non-imaging optical technology of LED lighting, more specifically, to a light distribution lens for LED street lamps. Background technique [0002] The development of LED (Light Emitting Diode, light-emitting diode) technology has opened up a new era of lighting technology revolution. Because LED has many advantages such as small size, long life, high electro-optical efficiency, environmental protection and energy saving, LED street lighting technology has developed rapidly in recent years. Since the radiation angle distribution of most LED light sources is a Lambertian distribution (Lambertian distribution) of 110 degrees to 120 degrees, if there is no light distribution, the light pattern on the ground will be a large circular spot, about 50% of the light scattered outside the road is not utilized, and it will cause glare to distant vehicles or pedestrians, which does not meet the requirements of road lighting. Good roa...

Claims

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Application Information

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IPC IPC(8): F21V5/04H01L33/00F21Y101/02F21W131/103
CPCG02B19/0061F21S8/08G02B27/0955G02B27/0916G02B19/0014F21Y2101/02F21W2131/103F21S8/086Y02B20/72F21V5/04F21Y2115/10
Inventor 蒋金波杜雪李荣彬张志辉
Owner THE HONG KONG POLYTECHNIC UNIV
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