Research On High Precision Assembly & Centering Technology And System Of Optical Lenses

In the manufacturing process of optical lens,optical assembly¢ering(A&C)technology is the key point that directly affects the performance and precision of the system.From the current situation of precision optical lens manufacturing industry,the assembly of optical lens is mainly accomplished by manually operation of experienced technicians with the help of some optical inspection instruments.For the A&C process of precision optical lens,the optical components absorbing technology,the optical lens assembly technology and centering technology are studied,and a set of high precision A&C system for optical lens is developed,aiming at reaching the requirements of high quality of precision optical lens,and improving the assembly efficiency and consistency of optical lens products.The main contents of this paper are summarized as follows:(1)The background and significance of optical lens A&C are introduced.The research status and development trend at home and abroad in both precision assembly technology and optical lens centering technology are studied,and the existing problems and technical difficulties in optical lens A&C process are analyzed.(2)The structural characteristics of the optical lens are analyzed,the definition of lens centering error and centering error measurement methods are summarized.Then,the coaxial alignment detection method is modified for optical lens assembly technology,and the centering adjustment algorithm based on the three-axis probe is used in optical lens centering adjustment technology.(3)Considering the precision optical lens,lens ring and barrel,the features and functional requirements of high precision assembly¢ering system of optical lenses are analyzed,the "mechanical axis + optical axis" integrated detection scheme is put forward for the first time,and a set of high precision optical lens A&C system has been developed.Also,the A&C procedure of precision optical lens is put forward.According to the gripping requirement of optical components such as lens and lens ring,the non-destructive and reliable grippers for different sizes of optical devices are designed.Based on the idea of modular design,the subsystems are designed in detail,and the key parts of the high precision A&C system are analyzed by finite element software.(4)According to the A&C process of precision optical lens,the error factors that influence the assembly accuracy of optical devices and barrel are analyzed.Based on the theory of multi-body system,the error transfer model of high precision A&C system is established.By using this model,the assembly deviation between the target part and the base part caused by the motion errors of the motion platforms in the system is calculated.The results show that the accuracy of the motion platform can not guarantee the assembly accuracy of the optical device and the lens barrel.The assembly error of the assembly process based on the coaxial alignment detection method is calculated,and the alignment error of the target parts and the base parts is at the micron level.(5)The optical lens assembly experimental platform is established,the assembly method of optical lens assembly is verified by matching the alignment image,and the accomplishment of assembly.The assembly method is feasible and effective for optical devices.Besides,the three-axis centering adjustment device is designed,the centering adjustment algorithm is used in optical lens centering experiment under the detection of optical lens centering error measuring instrument.