Eccentricity regulating method for lens optical system, eccentricity regulating device and program

Abstract

The invention relates to a method, a device and a program for adjusting the eccentricity of an optical lens system. The CTF of a zoom lens (21) is obtained through a lens design application program (72) by eliminating the assembling error of the mounting error of a first lens set and the predicted mounting error of the first lens set from the production error of all optical elements of the zoom lens (21). The CTF is inputted into an input terminal of a nerve network (84), and the movement amount of the first lens set is inputted into the input terminal, so that the nerve network (84) learns. When adjusting the eccentricity, the first lens set is arranged at an initial position for imaging a lens evaluation drawing (14) so as to obtain the CTE. The CTF is inputted into the nerve network (84) so as to obtain a first movement amount. The first lens set is moved from the initial position with the first movement amount.

Description

technical field [0001] The invention relates to an eccentric adjustment method, an eccentric adjustment device and an eccentric adjustment program of a lens optical system. Background technique [0002] Currently, many video cameras are equipped with zoom lenses. The zoom lens is composed of, for example, a front group lens, a zoom lens, a rear group lens, a focus lens, and the like. The focal length is changed by moving the zoom lens in the direction of the optical axis, and the focus is adjusted by moving the focus lens. [0003] The zoom lens, the rear group lens, and the focus lens are mounted on the lens barrel in such a way that their optical axes are roughly consistent. On the other hand, the front group lens is attached to the lens barrel by a spring-like ring or the like, and can move within a plane perpendicular to the optical axis during decenter adjustment. After the decentering adjustment of the front group lens, it is fixed on the lens barrel with adhesive o...

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned method is based on the visual observation of the operator, so skilled technology is required to determine whether the resolution is optimal, and there are also problems in that it is not suitable for mass production, and there are individual differences in the adjustment results. , thus lacking reliability

[0007] However, in the adjustment method of JP-A-2002-122785, it is necessary to evaluate the performance of the genetic algorithm and other probabilistic search methods on a generation-by-individual basis, so performance measurement must be performed many times.

In addition, in probabilistic exploration, even if a range of suitable lens positions without decentering can be found, it is difficult to find the optimal lens position in this range

Therefore, it is not possible to adjust instantaneously with high precision

[0008] In addition, in the adjustment method of JP-A-7-38798, the neural network is made to learn the relationship between the contrast ratio and the focus position of the focus lens, but the error at the time of manufacture, such as the molding error of the resin product, the lens unit assembly time, etc., is not reflected in the learning. error etc.

Furthermore, there is no mention of the application of the eccentric adjustment method to

[0009] Therefore, it is impossible to properly learn the neural network, and it is difficult to adjust the eccentricity of the lens with high precision.

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