Defocusing and compensation analysis of security lens under temperature load

In order to reduce costs and shorten the cycle, it is necessary to carry out heat-free design of security lenses in the design stage. Based on the OpticStudio STAR module as an interface tool between finite element analysis and optical analysis, the optical-mechanical thermal integration analysis of a security lens with an aperture of 1.6～1.3 was performed.The finite element model was established in UG and imported into Ansys. The thermal stress analysis was carried out with the highest and lowest temperatures within the normal operating temperature range of the lens as the load, and the surface profile data and related thermal stress data of the lens were obtained. The profile data were merged into Zemax using STAR module for optical defocus simulation. Through the structure-optical-structure iterative design, the finished lens which could meet the requirements at −40℃～80℃ image quality was designed. Finally, the imaging stability of the lens in the extreme temperature environment and the accuracy of the optical, mechanical and thermal integrated analysis were verified by the lens defocus measurement at high and low temperatures.