广角高清细径视频鼻镜光学系统设计

为了满足现代医疗内窥镜对广角、细口径及高清像质的需求,设计了一款广角高清细径视频鼻镜镜头,该镜头由前物镜组、后物镜组及转像棒镜、场镜组成。该镜头使用了三片场镜,对系统的场曲及畸变进行补偿,同时也减小了光学系统的横向尺寸。系统采用的均是球面透镜,可以降低成本。该镜头设计参数:入瞳直径0.1mm,全视场角为100°,镜头外径为2mm,物镜焦距1.145mm。优化设计结果显示:优化后的系统总长为239mm,在空间截止频率116lp/mm处,光学传递函数(MTF)大于0.4,接近衍射极限,满足分辨率要求。

Optical System Design of HD Wide-Angle Fine Video Rhinoscope

In order to meet the wide angle,small caliber and high-definition image quality requirements of the modern medical endoscope,a small diameter HD wide-angle video rhinoscope lens is designed which was composed by former object set,after lens group and lens,field lens and rod. Three sets of mirrors are used to compensate the field curva-ture and distortion of the system and also the transverse size of the optical system was reduced. The spherical lenses are used in this system which can reduce costs. The design parameters of the lens are that the pupil diameter is 0.1mm;the full field angle is 100 degrees;the lens outer diameter is 2mm;the objective lens focal length is 1.145mm. The optimized design results show that the total length of the optimized system is 239mm,and the optical transfer function(MTF)is greater than 0.4 at the cut-off frequency of 116lp/mm,which is close to the diffraction limit and the resolution requirement is satisfied.