Research On Zoom Cam Curves Optimization Of Infrared Continuous Zoom Lens

With the continuous development of infrared technology,the application of the infrared continuous zoom lens is becoming increasingly widespread.The infrared continuous zoom lens can not only simply recognize the target with a long distance and a large range,but also enlarge and observe the target with a short distance and a small range targets.It has the characteristics of continuous focusing,continuous and clear imaging during the zooming process.As a key part of the zoom lens,the cam is closely related to the continuity of zoom and the imaging quality of lens.Therefore,the design of the zoom cam is of great significance to ensure the performance of the infrared continuous zoom lensIn this paper,an infrared continuous zoom lens is studied and analyzed.Firstly,the zoom cam curves are fitted according to the optical system.Secondly,the initial design of the zoom cam curve is analyzed.According to the analysis results,the zoom variation group has rigid impact at the beginning and end of the movement,and the compensation group curve has large slope,large acceleration fluctuation,and sudden change in the short focal range.The zoom variation curve is corrected and optimized by two methods,and the optimal zoom curves are obtained by comparison to ensure the optical design.Thirdly,the optimized zoom curves are verified by the optical design software CODE V.After the optical verification,the overall structure of the infrared continuous zoom lens is designed.The ADAMS software is used to simulate the motion of the lens model to analyze the displacement,velocity and acceleration of the zoom variation group and the compensation group in zooming process.Finally,the deformation of the infrared continuous zoom lens in the extreme temperature environment is analyzed.The optimal structure cam suitable for this lens is obtained by simulating,analyzing and comparing the deformation of the zoom cam with different number and starting angles of curve grooves,and the different materials.In order to verify the correctness of the lens design optimization and simulation analysis,the infrared continuous zoom lens is subjected to normal temperature imaging test and high and low temperature imaging test.The experimental results show that the infrared continuous zoom lens has good imaging in the normal temperature test.The imaging quality in high and low temperature test decreases compared with that at normal temperature,but still satisfies the design requirements,which proves the accuracy of the design and simulation.