||For cameras in mobile phones, the lens deformation and image quality will be degraded due to the interference fit between the lens and the barrel. Therefore, this study investigates the lens deformation caused by interference fit lens assembly which is used in mobile phone lens. The mounting structure was designed and optimized to reduce the lens surface deformation and to improve the image quality. In this study, a four-lens imaging group was used as the optical design, and computer-aided design software was used for model construction. First, finite element analysis was utilized to estimate the lens surface deformation of a single-lens model. The data of surface nodes data were extracted. Then the node displacement data were used to determine the Zernike Polynomials by optomechanical transfer codes. Then Matlab was used to import the Zernike polynomials into the optical software and to calculate the MTF (Modulation Transfer Function). The flexure of each lens was optimized individually. Then the four lenses with optimum flexure designs were assembled together, and the MTF of the lens assembly was evaluated. Two objective function, the PV(Peak-to-Valley) value and the MTF value were used respective in this study. The simulation results revealed that the optimization approach which uses the MTF as the objective function leads to a better results.|
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