machine vision lens

Abstract

A machine vision lens includes a focusing group, a diaphragm and a fixed group in order from the object side to the image side, the focusing group including a first lens with positive refractive power, a second lens with positive refractive power, and a positive light Third lens with negative power and fourth lens with negative power, fifth lens with negative power, sixth lens with positive power, seventh lens with positive power, with negative power The eighth lens; the fixed group includes a ninth lens with positive refractive power; the focusing group is positive refractive power, the focal length of the focusing group is f1, the fixed group is positive refractive power, and the focal length of the fixed group is f2 , with 0.35<|f1 / f2|<0.5. The present invention adopts the fixed rear group focusing structure, which can realize the low distortion performance within the working distance from infinity to ultra-close distance, and has the characteristic of maintaining high image resolution in a large temperature range.

Description

technical field

[0001] The invention relates to a machine vision lens, and relates to the field of optical equipment. Background technique

[0002] Machine vision is to use machines instead of human eyes to measure and judge. Machine vision system refers to converting the target to be detected into digital signals through machine vision products (ie image capture devices, divided into CMOS and CCD), and these digital signals are then transmitted to a dedicated image processing system (embedded and video). Card mode), the image processing system sets the detection task according to the requirements of the target to be detected. Then, according to the result of the judgment, the equipment action on the scene is controlled to realize the functions of positioning, judgment, identification, detection and control. Once the information has been severely lost in the imaging system, it is very difficult to try to recover it in later stages.

[0003] Traditional machine vision lens...

Examples

no. 1 example

[0055] see Figure 1-Figure 7 , This machine vision lens, from the object side to the image side, includes a focusing group, a diaphragm and a fixed group in order, and the focusing group includes a first lens L1 with positive refractive power, a second lens with positive refractive power L2, The third lens L3 having positive refractive power, the fourth lens L4 having negative refractive power, the fifth lens L5 having negative refractive power, the sixth lens L6 having positive refractive power, the seventh lens having positive refractive power L7, the eighth lens L8 with negative refractive power; the fixed group includes the ninth lens L9 with positive refractive power.

[0056] In this embodiment, the first lens L1 is a concave-convex structure curved toward the image plane; the focal length of the first lens L1 is fL1; the second lens L2 is a concave-convex structure curved toward the image plane; the focal length of the second lens L2 is fL2; The third lens L3 is a con...

no. 2 example

[0081] see Figure 8-Figure 13 , in the present embodiment, when the focal length, group air interval d and lens curvature radius, thickness, spacing, refractive index, and Abbe number of 9 lenses and a protective glass of the visual lens satisfy the following conditions respectively:

[0082] WD=600mm, f=33.4mm, F#=2.02, FOV=18.3°;

[0083] fL1 fL2 fL3 fL4 fL5 fL6 fL7 fL8 fL9 44.43 341.50 27.18 -14.08 -19.32 19.70 42.14 -383.83 96.28

[0084] |f1 / f2| |fB1 / fB2| fL1 / f1 fL2 / f1 fL7 / f2 fL8 / f2 0.397 0.132 1.163 8.942 0.438 -3.987

[0085] Object distance (mm) infinity 1000 600 200 100 d 2.319 3.817 4.855 10.559 21.272

[0086]

[0087] In the above table, "n" is the refractive index, "R" is the radius of curvature, fL1~fL9 are the focal lengths of each lens, f1 is the focal length of the focusing group, f2 is the focal length of the fixed group, and fB1 and fB2 are the focal...

no. 3 example

[0091] see Figure 14-Figure 19 , in the present embodiment, when the focal length, group air interval d and lens curvature radius, thickness, spacing, refractive index, and Abbe number of 9 lenses and a protective glass of the visual lens satisfy the following conditions respectively:

[0092] WD=600mm, f=35mm, F#=2.04, FOV=17.6°.

[0093] fL1 fL2 fL3 fL4 fL5 fL6 fL7 fL8 fL9 46.41 305.05 28.01 -14.01 -21.61 21.03 33.26 -87.62 83.03

[0094] |f1 / f2| |fB1 / fB2| fL1 / f1 fL2 / f1 fL7 / f2 fL8 / f2 0.490 0.176 1.141 7.502 0.401 -1.055

[0095] Object distance (mm) infinity 1000 600 200 100 d 3.033 4.734 5.910 12.402 24.582

[0096]

[0097]

[0098] In the table, "n" is the refractive index, "R" is the radius of curvature, fL1~fL9 are the focal lengths of each lens, f1 is the focal length of the focusing group, f2 is the focal length of the fixed group, and fB1 and fB2 are the f...

technical field

[0001] The invention relates to a machine vision lens, and relates to the field of optical equipment. Background technique

[0002] Machine vision is to use machines instead of human eyes to measure and judge. Machine vision system refers to converting the target to be detected into digital signals through machine vision products (ie image capture devices, divided into CMOS and CCD), and these digital signals are then transmitted to a dedicated image processing system (embedded and video). Card mode), the image processing system sets the detection task according to the requirements of the target to be detected. Then, according to the result of the judgment, the equipment action on the scene is controlled to realize the functions of positioning, judgment, identification, detection and control. Once the information has been severely lost in the imaging system, it is very difficult to try to recover it in later stages.

[0003] Traditional machine vision lens...

Examples

no. 1 example

[0055] see Figure 1-Figure 7 , This machine vision lens, from the object side to the image side, includes a focusing group, a diaphragm and a fixed group in order, and the focusing group includes a first lens L1 with positive refractive power, a second lens with positive refractive power L2, The third lens L3 having positive refractive power, the fourth lens L4 having negative refractive power, the fifth lens L5 having negative refractive power, the sixth lens L6 having positive refractive power, the seventh lens having positive refractive power L7, the eighth lens L8 with negative refractive power; the fixed group includes the ninth lens L9 with positive refractive power.

[0056] In this embodiment, the first lens L1 is a concave-convex structure curved toward the image plane; the focal length of the first lens L1 is fL1; the second lens L2 is a concave-convex structure curved toward the image plane; the focal length of the second lens L2 is fL2; The third lens L3 is a con...

no. 2 example

[0081] see Figure 8-Figure 13 , in the present embodiment, when the focal length, group air interval d and lens curvature radius, thickness, spacing, refractive index, and Abbe number of 9 lenses and a protective glass of the visual lens satisfy the following conditions respectively:

[0082] WD=600mm, f=33.4mm, F#=2.02, FOV=18.3°;

[0083] fL1 fL2 fL3 fL4 fL5 fL6 fL7 fL8 fL9 44.43 341.50 27.18 -14.08 -19.32 19.70 42.14 -383.83 96.28

[0084] |f1 / f2| |fB1 / fB2| fL1 / f1 fL2 / f1 fL7 / f2 fL8 / f2 0.397 0.132 1.163 8.942 0.438 -3.987

[0085] Object distance (mm) infinity 1000 600 200 100 d 2.319 3.817 4.855 10.559 21.272

[0086]

[0087] In the above table, "n" is the refractive index, "R" is the radius of curvature, fL1~fL9 are the focal lengths of each lens, f1 is the focal length of the focusing group, f2 is the focal length of the fixed group, and fB1 and fB2 are the focal...

no. 3 example

[0091] see Figure 14-Figure 19 , in the present embodiment, when the focal length, group air interval d and lens curvature radius, thickness, spacing, refractive index, and Abbe number of 9 lenses and a protective glass of the visual lens satisfy the following conditions respectively:

[0092] WD=600mm, f=35mm, F#=2.04, FOV=17.6°.

[0093] fL1 fL2 fL3 fL4 fL5 fL6 fL7 fL8 fL9 46.41 305.05 28.01 -14.01 -21.61 21.03 33.26 -87.62 83.03

[0094] |f1 / f2| |fB1 / fB2| fL1 / f1 fL2 / f1 fL7 / f2 fL8 / f2 0.490 0.176 1.141 7.502 0.401 -1.055

[0095] Object distance (mm) infinity 1000 600 200 100 d 3.033 4.734 5.910 12.402 24.582

[0096]

[0097]

[0098] In the table, "n" is the refractive index, "R" is the radius of curvature, fL1~fL9 are the focal lengths of each lens, f1 is the focal length of the focusing group, f2 is the focal length of the fixed group, and fB1 and fB2 are the f...

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