Large-area collimated light source

Abstract

The invention relates to a large-area collimated light source. The large-area collimated light source comprises an integrated high-power LED light source, a compound parabolic concentrator called a CPC lens for short, a Fresnel lens, heat dissipation fins and a fan, wherein the fan is arranged at the bottoms of the heat dissipation fins and is used for forced refrigeration by blowing. The integrated high-power LED light source is arranged on the heat dissipation fins, and the compound parabolic concentrator is arranged in the front of the integrated high-power LED light source. Light emitted by the integrated high-power LED light source comprises paraxial light and non-paraxial light. After passing through the Fresnel lens, the paraxial light is converted into collimated light which is emitted. The non-paraxial light is collected by the CPC, converged on the Fresnel lens, and then converted into collimated light which is emitted. The large-area collimated light source adopts combination of the integrated high-power LED light source, the compound parabolic concentrator and the Fresnel lens, and realizes the uniform emitting of light emitted by the LED light source, thereby obtaining the large-area collimated light source and effectively improving the uniformity of light emitting and reducing an emission angle of emitted light.

Description

technical field [0001] The invention relates to the technical field of lighting devices, in particular to parallel light lighting. Background technique [0002] The detection and measurement of object contours, as well as the detection of tiny pores, usually use backlight lighting. Since the backlight is all diffuse light, when taking images of objects with rounded corners or rounded corners, the edges are prone to blurring; when detecting tiny pores, only a short distance can be detected. [0003] To overcome this problem, a parallel light source with high brightness can be used. A parallel lighting device in the prior art includes a shell and an inner cavity. The rear end of the inner cavity is provided with an LED, and the front end of the inner cavity is provided with a convex lens. According to the principle of the convex lens, if a point light source is placed at its focal point, parallel light will be emitted from the convex lens. [0004] The relative intensity of...

AI Technical Summary

Problems solved by technology

[0005] The existing technology uses LEDs to cooperate with convex lenses, but the radial light emitted by the LEDs is not uniform, resulting in uneven distribution of the overall light intensity, and finally the uniformity of the light emitted by the parallel lighting device is not good; when the field of view is relatively large, the problem of uniformity of light is more prominent

[0006] To sum up, the effect of the parallel light source in the prior art is not very ideal in a large area, and there are still many practical problems to be solved

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