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Design and Research of UV LED Curing System

Author: YangJie
Tutor: YaoYong；LiuHongDu
School: Harbin Institute of Technology
Course: Physical Electronics
Keywords: UV LED UV curing driver circuit optical system design
CLC: TN23
Type: Master's thesis
Year: 2010
Downloads: 237
Quote: 2
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Abstract


With the development of optical communication industry, optoelectronic devices are used more widely, thereby many higher requirements are put forward in the packaging process of optoelectronic devices. UV curing technology is a most widely used radiation curing packaging technology. However, the slow speed of UV curing light sources development leads to the curing effect not improved as expected. The emerging UV LED light sources have many advantages compared to the high-pressure mercury lamp, to some extent improves the efficiency of UV curing. These advantages consist of the long usful life, reducing the cost of frequent replacement of light bulbs, using LED light emitting mode means there are energy consumption only when UV LED is irradiated thus can effectively save energy, and UV LED light sources irradiate the dispensing position directly without output cable can reduce the cable lossed. Although UV LED light sources have much good performance, the radiation area, exposure time and illumination value and other indicators of UV LED curing system in the market can not meet the various requirments in various industrial productions. In this paper, the problem to be solved is to design a UV LED curing system and make it meet production requirments of the company.The core content of this paper includes constant current source driver circuit design and UV LED chip front-end convergent optical system design.(1) Constant current source driver circuit design.In this paper, buck topology circuit form was used. Chip HV9919 was selected as constant current source controller. As the actual application of the UV curing system required set irradiation and extinguishment time, an external timing relay jack was needed to control the current on and off time. The purpose of entire driver circuit design was to make UV LED driver output current value a constant.(2) UV LED chip front-end convergent optical system design.Design method is to use optical simulation software ZEMAX optical system to determine the convergence lens type and parameters, and the convergence of optical system could be obtained by optimizing. At last use theoretical calculations to validate the results of software design. After completing the single UV LED pen, UV light source was expanded.The final step was to do some performance tests on the desiged UV LED curing system, including the constant current source driver circuit accuracy and stability testing, and convergence optical system illumination adjustable testing and light intensity distribution curve of light spot. By analyzing the results of performance tests, the conclusions were obtained.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > UV technology and equipment
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