与汞灯相比，紫外 LED波长单一，不能与现有紫外油墨的光引发剂完全兼容，难以实现汞灯的固化效果。本文给出了一种多波长均匀混合的紫外 LED油墨固化系统设计方法。将三种波长的紫外 LED在弧面上排成阵列，采用光学自由曲面，使每颗 LED灯珠均匀照射固化区域，结合照明角度倾斜变化，解决了波长均匀混合与照度均匀技术难题。光线追迹仿真结果表明，在距光源 600 mm的目标面上得到了波长混合均匀，平均照度为 110.7 mW/cm2，照度均匀性为 0.82的照明光斑，该设计有望模拟汞灯的多光谱照明效果，促进紫外 LED在油墨固化中的应用。

Comparedwith mercury-vapor lamp, ultraviolet (UV) LED suffers from the disadvantage of having a singlewavelength, which is not fully compatible with the existing photoinitiator of ultraviolet ink. It is difficult using UVLEDs to achieve the curing effect comparable to what mercury-vapor lamp can do. This article presents a design of UVLED ink curing system that provides evenly mixed light with multiple wavelengths. We put a UVLED array with three wavelengths on a cambered surface and achieved uniform illumination in ink curing area by using optical freeform surface. By adding the adjusting of the tilt angle, we solved the dilemma of uniform wavelength mixing and uniform illumination. The ray tracing simulation results show that an illumination spot with uniform wavelength mixing, an average illumination of 110.7 mW/cm2, and an illuminance uniformity of 0.82 is obtained on a target surface 600 mm away from the light source. This design is expected to simulate the multi-spectral illumination effect of mercury-vapor lamps, which can promote the application of UVLEDs in ink curing.