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Imaging system

An imaging system and image-side technology, applied in the optical field, can solve the problems of low dynamic range, difficult to display imaging details, and large lens distortion.

Pending Publication Date: 2021-03-19
舜宇光学(中山)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Imaging systems applied to machine vision have very high requirements for pixels, picture uniformity, distortion, brightness, and color reproduction. However, the current machine vision lenses on the market have large distortion, uneven brightness, and difficult to show imaging details. Not high, and the color and contrast are not good enough

Method used

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Experimental program
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Effect test

Embodiment approach

[0056] In the imaging system of the present invention, the first fixed lens group G1 is used as a fixed group to mainly collect light, so that the light enters the imaging system smoothly, thereby reducing the tolerance sensitivity of the system. Secondly, it can correct the chromatic aberration of the system, ensure good color reproduction and improve the image quality of the imaging system. The second focusing lens group G2 is used as the focusing group, and its main function is to enable the optical system to image clearly at different object distances, correct the system aberration and distortion, and reduce the tolerance sensitivity of the system, thereby ensuring the high image quality of the imaging system Uniform quality and picture quality. As a fixed group, the third fixed lens group G3 can make light rays arrive smoothly and ensure a smaller chief ray deflection angle of the imaging system. According to an embodiment of the present invention, the third fixed lens g...

Embodiment approach 1

[0072] figure 1 is a configuration diagram schematically showing the imaging system according to Embodiment 1 of the present invention.

[0073] The following table 2 lists the relevant parameters of each lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number:

[0074]

[0075]

[0076] Table 2

[0077] In this embodiment, the total length of the imaging system is L=63.3mm, the focal length of the system is f=45.02mm, the object distance range of the imaging system is 0.04m-inf, and the aperture number is F=2.8. The first fixed lens group G1 includes four lenses (L1-L4), the lens L2 and the lens L3 form a doublet lens, and the stop STOP is located between the lens L3 and the lens L4. In this embodiment, the lenses with positive refractive power in the first fixed lens group G1 are L1 , L2 , and L4 , and the lenses with negative refractive power are L3 . The second focusing lens group G2 include...

Embodiment approach 2

[0080] Figure 7 is a configuration diagram schematically showing an imaging system according to Embodiment 2 of the present invention.

[0081] The following table 3 lists the relevant parameters of each lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number:

[0082]

[0083]

[0084] table 3

[0085] In this embodiment, the total length L of the imaging system is 71.3mm, the focal length of the system is f=49.7mm, the object distance range of the imaging system is 0.05m-inf, and the aperture number is F=3. The first fixed lens group G1 contains four lenses (L1-L4), lens L2 and lens L3 form a doublet lens, and the stop STOP is located between the first fixed lens group G1 and the second fixed lens group G2 . In this embodiment, the lenses with positive refractive power in the first fixed lens group G1 are L1 , L2 , and L4 , and the lenses with negative refractive power are L3 . The second focusing ...

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Abstract

The present invention relates to an imaging system, which sequentially comprises, from an object side to an image side, a first fixed lens group (G1) having positive refractive power, a second focusing lens group (G2) having positive refractive power, and a third fixed lens group (G3) having positive refractive power or negative refractive power, wherein the focal length f1 of the first fixed lensgroup (G1) and the focal length f of the imaging system satisfy the following relational expression: lf1 / fl is more than or equal to 1.4 and less than or equal to 3.55. The imaging system has the advantages of being low in distortion, large in depth of field, uniform in image quality, good in color rendition degree, high in contrast ratio, high in resolution ratio and low in chromatic aberration,and has the temperature drift correction function.

Description

technical field [0001] The invention belongs to the field of optical technology, in particular to an optical imaging system. Background technique [0002] Machine vision refers to sending the light signal to the camera through the machine vision lens, and then the camera converts the light signal into an electrical signal and transmits it to the image processing system. structure to control the device actions in the field. In the era of industrial automation, the demand for machine vision is increasing year by year, and it has been widely used in electronic manufacturing, defect detection, precision testing and other fields. [0003] Imaging systems applied to machine vision have very high requirements for pixels, picture uniformity, distortion, brightness, and color reproduction. However, the current machine vision lenses on the market have large distortion, uneven brightness, and difficult to show imaging details. Not high, and the colors and contrast are not good enough...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00
CPCG02B13/0015G02B13/009
Inventor 周静王仕旺
Owner 舜宇光学(中山)有限公司