外鼓式热敏CTP制版机光学系统设计

为了解决外鼓式热敏计算机直接制版(CTP)设备的制版镜头因畸变、场曲过大而导致制版质量不良问题, 采用ZEMAX光学仿真软件, 设计了一款低畸变、低场曲的制版镜头光学系统, 并对其进行了公差分析和实验验证。结果表明, 该光学系统由6片透镜组成, 工作波长为830 nm, 场曲小于1 μm, 畸变小于0.1%, 调制传递函数在全视场200 lp/mm处大于0.7, 并且镜片都采用标准球面设计, 制版效果良好。该系统能够满足实际制版生产需求, 具有一定的市场前景。

Optical design of external drum thermal CTP equipment

In order to solve the problem of poor plate-making quality caused by distortion and field curvature of the plate-making lens of the external drum thermal computer to plate (CTP)equipment, a low-distortion and low-field-curvature plate-making lens optical system was designed using ZEMAX software. Tolerance analysis and experimental verification have been carried out. The results show that the optical system is consisted of six lenses, the working wavelength is 830 nm, the field curvature is less than 1 μm, the distortion is less than 0.1%, and the modulation transfer function is greater than 0.7 at the full field of view of 200 lp/mm. All the lenses in this system are designed with a standard spherical surface, and the plate-making effect is good, which can meet the actual plate-making production needs, and has a certain market prospect.