Method for measuring defocus curve of lens assembly
A lens assembly and defocusing technology, which is applied in the field of measuring the defocusing curve of lens assemblies, can solve the problems such as the influence of the calculation accuracy of the SFR algorithm, and achieve the effect of improving focus assembly efficiency, strong scalability and compatibility, and improving production efficiency.
Pending Publication Date: 2022-06-07
NINGBO SUNNY OPOTECH CO LTD
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Problems solved by technology
With the continuous change of customer requirements, there is a demand for calculating the SFR value under different target angles, while the traditional SFR algorithm generally tests the angle of the target within 3-8 degrees, beyond this range, the calculation of the SFR algorithm Accuracy will suffer
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[0039] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.
[0040] It should be noted that in this specification, the expressions first, second, etc. are only used to distinguish one feature from another feature and do not imply any limitation on the feature. Accordingly, the first body discussed below could also be referred to as a second body without departing from the teachings of the present application.
[0041] In the drawings, the thickness, size and...
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The invention provides a method for measuring an out-of-focus curve of a lens assembly, which comprises the following steps that: 1) the lens assembly is arranged in a test light path, the lens assembly comprises an optical lens, the test light path is provided with a target plate and a photosensitive chip, and the photosensitive chip is used for receiving an image formed by the optical lens on the target plate; 2) changing the axial distance between the optical lens and the photosensitive chip in the test light path to obtain a target plate image corresponding to each axial distance; and 3) when the knife edge angle of the target plate of the test light path is not matched with the SFR algorithm carried by the measurement system, rotating the knife edge angle based on affine transformation so as to be matched with the SFR algorithm, and further measuring an actually measured out-of-focus curve. According to the method and the device, the expandability of the SFR algorithm and the compatibility of different types of standard boards can be improved.
Description
[0001] Related applications [0002] This application is a divisional application of the parent case entitled "Calibration prediction method of lens assembly to be assembled and camera module assembly method", Chinese patent application number CN 202011417294.X submitted on December 7, 2020 . technical field [0003] The present invention relates to the technical field of camera modules, and in particular, to a method for measuring the defocus curve of a lens assembly. Background technique [0004] With the popularization of mobile electronic devices, the related technologies of camera modules used in mobile electronic devices to help users obtain images (such as videos or images) have been rapidly developed and advanced, and in recent years, camera modules The group has been widely used in many fields such as medical treatment, security, industrial production and so on. In recent years, users have higher and higher requirements on the imaging quality of the camera module,...
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IPC IPC(8): H04N17/00
CPCH04N17/002
Inventor 周广福钟凌廖海龙潘梦鑫曾权
Owner NINGBO SUNNY OPOTECH CO LTD