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An automatic focusing method based on lens field curvature

An automatic focusing and lens technology, applied in focusing devices, instruments, installations, etc., can solve the problems of low edge ratio and high center ratio, and achieve the effect of ensuring resolution

Active Publication Date: 2016-01-20
NINGBO SUNNY OPOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention is used to solve the problem that the center ratio of the auto-focus mobile phone module is relatively high and the edge ratio is low. In order to make the edge and center of the product meet the requirements of the ratio specification, an autofocus method based on lens field curvature is provided.

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  • An automatic focusing method based on lens field curvature
  • An automatic focusing method based on lens field curvature
  • An automatic focusing method based on lens field curvature

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Embodiment Construction

[0012] Due to the field curvature of the lens, the focal lengths of the center and the edge are not on the same plane. Therefore, after auto-focusing at the center of the lens, the resolution of the center area reaches the highest, that is, the center of the lens reaches the focal length position, while at this time, the edge is not at the focal length position.

[0013] As the center goes to the edge, the field curvature increases, resulting in a larger defocus at the edge. In order to reduce the amount of out-of-focus at the edge, you can adjust the final stop position of the motor to reduce the amount of out-of-focus at the edge, but at the same time ensure that the center is still within the focal depth range. This not only ensures that the resolution of the center meets the requirements, but also improves the resolution of the edge.

[0014] Specifically analyze the field curvature of the lens, such as figure 1 As shown, the central focal length position of lens 1 is at...

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Abstract

The invention provides an automatic focusing method based on shot field curvature. After a shot automatically focuses aiming at a center, the final stop position of a shot motor is adjusted, the defocusing amount of the focal length of the edge of the shot is reduced, and at the same time, the method ensures that the focal length in the center of the shot is still within a focal depth range. According to the automatic focusing method, due to the fact that the final stop position of the motor after automatic focusing is adjusted, the resolution ratio of centers and edges of some shots with large curvature can be guaranteed at the same time.

Description

technical field [0001] The invention relates to a novel auto-focusing method based on field curvature of a lens, which is used to improve the focusing effect of auto-focusing. Background technique [0002] At present, some mobile phone lenses have relatively large field curvatures in different fields of view, especially the deviation between the central field of view and the peripheral field of view is very large. However, the existing autofocus methods for mobile phones basically use a single-point focus at the center. Therefore, after autofocus, the center will be very clear (beyond the product resolution design specification), but the four corners will be blurred (lower than the product resolution). rate design specifications). Based on the existing problems, it is necessary to study a new autofocus method to solve this problem. This enables both the center and the edge to meet product resolution design specifications. Contents of the invention [0003] The invention...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B13/36G02B7/09
Inventor 丁亮张宝忠张扣文袁业辉褚水佳
Owner NINGBO SUNNY OPOTECH CO LTD