一种10倍可见光连续变焦电视镜头设计

Design of 10 Times Ratio Visible Continuous Zoom TV Lens

为了满足电视跟踪中对目标探测识别的需求,设计了一种基于1/2英寸CCD的10倍可见光连续变焦电视镜头。该连续变焦电视镜头的焦距为40~400mm,F#为3.5,视场角为11.48°~1.15°。该系统采用负透镜组变倍和正透镜组补偿的方式实现连续变焦,系统的变焦曲线连续且平滑,图像在连续变焦过程中可一直保持清晰,短焦时可快速跟踪目标,长焦时可清晰识别大小为2m的物体,该电视镜头能够对12.5m^25km内的目标清晰成像,从而对其进行跟踪识别。系统连接变焦过程中成像质量较好,无拐点,满足电视跟踪系统的需求。

To meet the demands of detecting and identifying the target in TV tracking, a l0 ratio visible light continuous zoom TV lens based on 1/2 inch CCD is designed. A result of lens with 40-400 mm focal length, 3.5 F number, 11.48%- 1.15% FOV is given. The concave lens group for variable magnification and the positive lens group for compensation are used. The cam curves of the zoom system are continuous and smooth and keep high resolution during zoom operation. The system could track the target quickly when in short focal length and the resolution arriving at long focal length could distin- guish the objects of 2 m. The system has long working distance from 12. 5 m-25 km with high resolution, and then it can track and identify the target. The system has high image quality and no inflexion in continual focal variation process, and meets the requirements of TV tracking system.