激光扫描系统中f-θ透镜是必不可少的部件,针对目前国内激光扫描系统工作面小、测量速度慢、测量精度低等缺点,设计出一种大视场大相对孔径f-θ透镜以改善以往系统的不足,提高工作效率.设计中透镜是一种负畸变透镜,属于像方远心光路,预期参数为2ω=60°,D=120 mm,f=500 mm.经过计算后,利用Zemax软件对f-θ透镜模型进行了优化设计,得到艾里斑直径3.514 μm,扫描范围为500 mm×500 mm,相对孔径为6/25的大工作面大相对孔径的f-θ透镜,成像清晰,优化结果达到了预期的设计指标.

The f-θ lens is an important essential component in laser scanning systems.For the shortcomings of current domestic laser scanning systems such as small working surface ,slow measuring speed ,low measurement accuracy,a large field of view(FOV)f-θ lens was designed with large relative aperture to improve the working efficiency.The designed lens is a negative distortion lens with the image space telecentric optical path.Expected parameters are as follows:2ω=60°,D=120 mm,f=500 mm.After calculation,the Zemax software was used to optimize the design for f-θ lens model.Finally ,a large-working-area large-relative-aperture f-θ lens was obtainde with an Airy disk diameter of 3.514μm,a scanning range of 500 mm×500 mm and an aperture of 6/25.The image is clear,the optimization results achieve the expected design target.