Design And Research On Switching Mechanism Of Array Ultra-thin Optical Lens

Space remote sensing cameras are widely used in many fields such as national military and meteorological surveys.The multi-spectral imaging method needs to achieve multi-field area single-spectral or multi-spectral filter imaging.Therefore,a filter switching mechanism is required for different spectral bands.The light achieves high precision and high stability to cut in and out of the optical path,and at the same time,it is necessary to ensure the high reliability and low power consumption of the mechanism in orbit.The special use environment of this mechanism requires light weight,high strength and rigidity,high precision and sensitivity,and self-locking function.By comparing the characteristics of various filter switching mechanisms,an array type ultra-thin optical lens switching mechanism is proposed design scheme.The overall structure design of the array type ultra-thin optical lens switching mechanism,including the mechanism composition,the analysis of the movement principle and the material selection,etc.The main components were selected and designed,the filter locking and installation plan was set,and the switching time of a single filter assembly,the number of operations of gears,bearings,and motors,and the positioning accuracy of the optical axis were theoretically reviewed.The results Meet the design requirements.Through anti-cold welding,anti-pollution,anti-radiation design,reduce the probability of mechanism failure.The simulation analysis of the array type ultra-thin optical lens switching mechanism.Static analysis shows that the deformation and stress of the mechanism are very small.The fundamental frequency of the mechanism is 139.91Hz,which meets the design requirements of fundamental frequency greater than 100Hz.The maximum acceleration response value of sinusoidal vibration is 2.7×10^-2g,which is too small to cause damage to the structure.Under random vibration,the displacement of the mechanism 1.42mm and the maximum stress value of 427.96MPa are both within the allowable range,the acceleration response value does not exceed 25g,and the relative magnification does not exceed 3.5 times.The simulation analysis results prove that the mechanism has good dynamic mechanical properties.Can withstand the dynamic load during launch.Carry out accelerated life test and vibration test on the mechanism.Gravity unloading chooses the single-filament double-pulley counterweight unloading plan.By adjusting the motor speed,the life test is accelerated,and the mechanism after the test is tested,and the various indicators can still meet the requirements.The sine frequency sweep test results show that the structural modal frequency deviation is less than 5%,which meets the requirements of the test program.From the random vibration test results,it can be seen that the maximum acceleration in the Y direction is 21.23g,which is 3.33 times the input conditions.The acceleration response values in the X and Z directions are relatively small,and there is little deviation from the simulation results.The mechanism test is completed There was no damage or abnormal changes in the inspection organization,which finally verified the rationality of the organization design.