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UV curing has been developed more than 50 years in the world. It is the most extensive radiation curing technology at present, but it is also a target to be strongly developed around the world. However, the development is relatively weak in our country, and most of them are still using the traditional high-pressure mercury lamp. Furthermore, the traditional high-pressure mercury lamp has many disadvantages. For this problem, this paper put forward an exploratory design on focus-variable UV curing optical system with LED ring array. We select focal length of 145mm and 330mm, and then successfully achieve the uniformity of illumination more than 80% and reach the goal of focus-variable function. In addition, we study the influence of the reflector for UV curing system in market. We found reflector can really improve the divergence of light. In this study, when the angle of the reflector is 25°, the system can have the maximum illumination. Also the light efficiency can achieve optimal utilization of light, as the angle is 35°.
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