A led optical system forming a uniform square light spot

Abstract

The invention belongs to the technical field of ultraviolet curing, and discloses an LED optical system for forming uniform and square light spots. The LED optical system comprises an optical device body, wherein the optical device body comprises trapezoidal light reflectors, LED light sources, a receiver and a display area; the optical device body is a square array which is formed by arranging the plurality of LED light sources at an uniform spacing; the LED light sources in the form of the square array are enclosed by the four trapezoidal reflectors; the square receiver is arranged at a position which is 60mm below the optical device body; and the top of the receiver is provided with the display area for displaying irradiance uniformity. According to the LED optical system, the structure is simple the process is easy to realize, the development and production period is greatly reduced, the price is low, and the uniformity of the light spots is high.

Description

technical field [0001] The invention relates to an LED optical system, in particular to an LED optical system forming a uniform square light spot, and belongs to the field of ultraviolet curing technology. Background technique [0002] There are many methods of applying optical systems to form a uniform rectangular spot on the market. According to different application requirements, they can be roughly divided into the following categories: 1) The uniformity of the rectangular spot is required to be extremely high, and the projection distance of the spot is relatively far, which can reach beyond 2 meters. Therefore, the complex optical system is used to mix and condense the light emitted by the LED light source through multiple refraction and reflections to form a uniform rectangular spot. This method is mostly used in the optical system of projectors, and the optical efficiency is low. High, higher requirements on production technology; 2) Higher optical efficiency is requi...

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Problems solved by technology

[0002] There are many methods of applying optical systems to form a uniform rectangular spot on the market. According to different application requirements, they can be roughly divided into the following categories: 1) The uniformity of the rectangular spot is required to be extremely high, and the projection distance of the spot is relatively far, which can reach beyond 2 meters. Therefore, the complex optical system is used to mix and condense the light emitted by the LED light source through multiple refraction and reflections to form a uniform rectangular spot. This method is mostly used in the optical system of projectors, and the optical efficiency is low. High, higher requirements on production technology; 2) Higher optical efficiency is required, and the projection distance is not far, mostly within 0.5 meters, so use a simple secondary optical design to equip each LED with a lens or reflective cup to convert the light source All the light rays are collected within the rectangular spot, and the geometric shape of the optical interface of the optical device is designed according to the irradiation distance to form a uniform rectangular spot. This solution is mostly used in the UV curing process on the product line. Relatively speaking, the process of this optical system is still It is a bit complicated, and the price is a bit high; 3) The optical system needs to be simpler and the price is cheaper, so you can directly arrange multiple LED point light sources into a square array, and then directly irradiate the illuminated surface, and the projection distance of the light spot is very close , within about 50 mm, this solution is mostly used for UV curing systems on automatic printing machines in the printing industry, and the spot uniformity of this solution is slightly worse

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