Proceedings Article | 24 July 2018
Proc. SPIE. 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018)
KEYWORDS: Optical design, Imaging systems, Lens design, 3D modeling, Video surveillance, Infrared radiation, Zoom lenses, Intelligence systems, Infrared zoom
In recent years, with the increasing demand of intelligent transportation system for large-scale field monitoring, it is a pretty much necessity for the continuous zoom system with large scale ratio and large field angle. Therefore, based on the characteristic of its optical system with 30 times variable ratio and large field angle, the mechanical structure of continuous zoom lens has been designed in detail, and finally two kinds of cam mechanism are described in this paper in order to realize the zoom and focusing process. Furthermore, in order to meet the work environment requirements of video monitoring system for the zoom system, the static simulation and thermal deformation simulation of the key component zoom cam has been analyzed in this paper. The static analysis results show that the deformation of the force of the zoom cam is 0.0015 mm, which can be ignored. Thermal deformation analysis results show that the zoom cam at - 15 °C to 50 °C under the temperature load of maximum deformation is 0.007 mm, which has meet the requirements of the system of working temperature, and all of the above results have verified the rationality of the design of zoom cam mechanism. On the basis of the selective zoom mechanism, a reasonable focusing mechanism is carried out to ensure the focus stability of the focusing mechanism, which can provide the stability of the whole continuous zoom lens system.
