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Automatic focusing system

An automatic focusing and lighting system technology, applied in the field of optics, can solve problems such as inaccurate focusing and imaging

Pending Publication Date: 2021-11-23
SHENZHEN CUTTYLIGHT TECH CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The main purpose of the present invention is to provide an automatic focusing system, aiming to solve the technical problem of inaccurate focusing and imaging in the prior art

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Embodiment Construction

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the ...

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Abstract

The invention discloses an automatic focusing system. According to the invention, an illumination system generates two paths of illumination light beams emitted to a characteristic signal generation system; the characteristic signal generation system comprises two transparent gratings with regular periods; the two illumination light beams respectively pass through a transparent grating to form two paths of transparent grating image light beams, the two paths of transparent grating image light beams are emitted to a TIR prism, the two paths of transparent grating image light beams passing through the TIR prism are emitted to an objective lens at different angles, and the two paths of transparent grating image light beams interfere on an object plane after passing through the objective lens to form a moire fringe image; and the imaging system is used for capturing the moire fringe image, and the processor is used for determining the defocusing direction and the defocusing amount of the automatic focusing system according to the position of the moire fringe image captured by the imaging system and determining the adjustment amount of the position of the objective lens according to the defocusing direction and the defocusing amount. According to the technical scheme, automatic focusing is rapid and accurate.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to an automatic focusing system. Background technique [0002] With the development of the resolution of the lens in the modern industry towards micron, submicron, and nanometer, the depth of focus of the lens is getting smaller and smaller, and the requirements for production efficiency in modern industry are getting higher and higher. The focus system came into being. [0003] Autofocus technology can be roughly divided into two categories: the first category directly calculates the image contrast of the object being imaged, and finds the lens position with the highest contrast; the second category requires a special autofocus system. The first type needs to predict the focus movement direction and does not meet the efficiency requirements of modern industry, so the second focus method is generally used. [0004] The existing automatic focusing method makes judgments based on t...

Claims

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Application Information

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IPC IPC(8): G02B7/28
CPCG02B7/28G02B7/34G02B7/36G02B21/006
Inventor 樊思民
Owner SHENZHEN CUTTYLIGHT TECH CO LTD
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