含偶次非球面的手机镜头降敏设计方法OA

In the optical design process,the optimization of optical system performance and tolerance anal-ysis are often treated separately.A system with excellent theoretical performance may have excessively tight tolerance.Therefore,the desensitization of the optical system is crucial during the system design pro-cess.The even aspheric surfaces are commonly used in the mobile phone lens to reduce aberrations and to-tal track length.However,the introduction of high-order terms can lead to significant image quality degra-dation caused by the misalignments.A desensitization design method based on nodal aberration theory was proposed in this paper to desensitize mobile phone lenses with even aspheric surfaces.First,based on nod-al aberration theory,the variations in Zernike coefficients for third-order coma and astigmatism were ana-lyzed for the conic surface base of the misaligned even aspheric surfaces.Then,in order to calculate the variation in wavefront error introduced by the higher-order terms,a transformation of the pupil coordinates was used to obtain the pupil map of the optical surface under misalignments.Based on the coordinate trans-formation in the pupil map,the variation in wavefront error was then calculated.Finally,an as-built per-formance model suitable for optical systems with even aspheric surfaces was established,which was then used to design a 4-element mobile phone lens.The tolerance analysis showed that after 30 minutes of opti-mization and under 5 μm decenter and 5' tilt tolerance,the mean RMS wavefront error of the mobile phone lens was reduced by 33%compared to the default design method,which verifies the effectiveness of the proposed design method in the paper.