Focusing and fine-adjusting method and system for variable-focal-length optical lens

Abstract

The invention provides a focusing and fine-adjusting method for a variable-focal-length optical lens. The method comprises the following steps of A, a focusing motor is controlled by a DSP to act and read resolution values; B, whether the resolution values meet the requirements is judged, and the step C is carried out if the resolution values meet the requirements or the step A is carried out if the resolution values don't meet the requirements; C, the step number and the fine-adjusting values of the focusing motor are calculated to generate the step number after fine adjustment; D, the focusing motor moves to the fine-adjusted position to finish focusing. The focusing and fine-adjusting method and system have the advantages that a focused image plane is adjusted to the optimal clear point of the peripheral area through a method slightly sacrificing central area analysis, namely, the center and the periphery can meet the standards and the requirements, the resolution loss in the central area is slight and can be ignored, and accordingly the standards and the requirements are met.

Description

technical field [0001] The invention relates to a focusing method and system, in particular to a focusing fine-tuning method and system for a zoom optical lens. Background technique [0002] Digital imaging products have been popularized now. Digital imaging products with optical zoom can zoom in on distant objects to be photographed without changing the shooting position, which is very convenient for shooting work, so it is favored by people. In optical zoom imaging products, due to many factors such as lens material, process, assembly tolerance, and image sensor position deviation during the manufacturing process of the lens, the resolution gap between the central area of ​​the image and the surrounding area is too large. After focusing, the resolution of the central area meets the standard requirements, but the resolution of the surrounding area or a certain corner cannot meet the standard, resulting in partially clear and partially blurred images, and satisfactory video ...

AI Technical Summary

Problems solved by technology

[0005] But in practice, due to the problems mentioned above, after focusing on the center, the surrounding area is not on the best clear point, and because the image plane depth range of the surrounding area itself is small, the resolution will decrease after leaving the best clear point. drops sharply, causing the four-week resolution to fail to meet the requirements

[0006] Usually, after this problem occurs in production, such lenses can only be scrapped as defective products. Therefore, such problems lead to a large number of scrapped lenses, which has a great impact on the timely delivery rate of production and production capacity.

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