Mixed surface optical system design method

Abstract

The invention discloses a mixed surface optical system design method. An initial system is built, and K characteristic rays are selected; m intersection points between m characteristic rays and a spherical surface a are solved, m characteristic data points are obtained, and the m characteristic data points are fit to obtain a spherical surface Am; an (m+1)th characteristic data point is solved, m+1 characteristic data points are fit to obtain a spherical surface Am+1; and so on, a Kth characteristic data point is solved and K characteristic data points are fit to obtain a spherical surface a;and so one, all spherical surfaces are acquired; with a spherical surface optical system as an initial system, intersection points between K characteristic rays and the spherical surface a are used asthe K characteristic data points; the K characteristic data points are fit to obtain an aspheric surface b; and so on, all aspheric surfaces are acquired to obtain a first mixed surface optical system; with the first mixed surface optical system as an initial system, intersection points between K characteristic rays and the aspheric surface b are used as the K characteristic data points; the K characteristic data points are fit to obtain a to-be-solved free-form surface; and so on, all free-form surfaces are acquired.

Description

technical field [0001] The invention relates to the field of optics, in particular to a design method of a full-field, point-by-point-based hybrid surface optical system. Background technique [0002] In the case of meeting the performance requirements of the optical system, using simple curved surfaces such as spherical and aspheric surfaces instead of complex curved surfaces such as free-form surfaces to design optical systems can reduce costs and reduce the difficulty of processing and testing. Each surface of the hybrid surface optical system can have different options, such as spherical, aspherical and free-form surfaces. Therefore, the cost of the hybrid surface optical system is lower than that of the free-form surface optical system, and the difficulty of processing and detection is small. [0003] However, the existing design method of the hybrid surface optical system is to obtain the coaxial spherical system by solving the paraxial optical theory, and then transfo...

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Problems solved by technology

[0003] However, the existing design method of the hybrid surface optical system is to obtain the coaxial spherical system by solving the paraxial optical theory, and then transform the coaxial spherical system into an off-axis hybrid surface optical system in the subsequent optimization process. The hybrid surface optical system has a large error from the ideal system

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