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Jifeng Sun

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Proceedings Article | 28 November 2023 Poster + Paper

Optical system design for zoom lens based on Delano diagram

Liang Sun, Xiaotong Li, Zhaofeng Cen, Jifeng Sun

Proceedings Volume 12765, 1276510 (2023) https://doi.org/10.1117/12.2682728

KEYWORDS: Zoom lenses, Design and modelling, Optical components, Mathematical optimization, Image quality, Lens design, Optical design, Lenses, Geometrical optics

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Zoom system is an optical system of which the focal length can be changed continuously within a certain range, while the image plane keeps stable and the image quality remains good. Zoom system usually consists of fixed group, variable group and compensation group. However, designing a zoom system can be a complex task due to the large number of variables involved in the optical design. One of the critical challenges is to obtain an effective initial structure of the zoom system. In this paper, a design method based on Delano diagram is proposed to establish the first-order model for the initial structure of the zoom system, which describes the relationship between the zoom ratio, focal length, and other parameters. On the basis of the model, the first-order merit function of the zoom system is analyzed and derived. By controlling the merit function with the help of the algorithm optimization, the first-order solution for the initial structure of zoom system is obtained and can be used for subsequent optimization. In order to further prove the effectiveness of the initial structure, the first-order solution is converted into an actual lens according to the properties of the zoom system. After further optimization, a zoom system with good image quality is obtained, which indicates that the initial structure of the zoom system is of great optimization potential. The final result shows that the design method proposed in this paper provides a helpful approach to solving the problem in obtaining an effective initial structure of the zoom system.

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