Low-distortion high-pixel large-target plane machine vision lens

A machine vision, high-pixel technology, applied in the field of optical lenses, can solve the problems such as the need to improve the analytical performance and the cost-effectiveness, and achieve the effect of high cost-effectiveness and wide working distance range.

Pending Publication Date: 2020-01-17
凤凰光学股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, for example, the patent application No. 201621237304.0 discloses a low-distortion close-range athermalization machine vision lens. The lens uses 8 lenses with an aperture of 2.08 and has a high cost performance. However, the lens is used in When the object distance is 600mm, the MTF center of 200lp / mm spatial frequency is 0.4, and the periphery is about 0.3. The resolution performance needs to be improved; Analytical performance, but using 9 lenses, cost performance still needs to be improved

Method used

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  • Low-distortion high-pixel large-target plane machine vision lens
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  • Low-distortion high-pixel large-target plane machine vision lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The lens of this embodiment is framed with 8 lenses, and the optical parameters of the lens and each lens are as follows:

[0050] Table 1 embodiment 1 each lens relevant parameter

[0051]

[0052]

[0053] In Table 1, L1R1 represents the mirror surface on the object side of the convex-concave glass spherical lens L1, and L1R2 represents the mirror surface on the image side of the convex-concave glass spherical lens L1; the rest are the same, refer to figure 1instructions in . R represents the radius of curvature, nd represents the refractive index, and vd represents the Abbe number.

[0054] Table 2 Lens-related parameters of Embodiment 1

[0055] f F# TTL DFOV f7 f8 f7 / f8 25mm 1.82 40.7mm 45° -56.97 46.88 -1.21

[0056] In Table 2, f represents the focal length of the lens, F# represents the aperture number of the lens (abbreviated as the aperture), TTL represents the total optical length of the lens, DFOV represents the max...

Embodiment 2

[0065] The lens of this embodiment is framed with 8 lenses, and the optical parameters of the lens and each lens are as follows:

[0066] Table 4 embodiment 2 each lens relevant parameter

[0067]

[0068] In Table 4, L1R1 represents the mirror surface on the object side of the convex-concave glass spherical lens L1, and L1R2 represents the mirror surface on the image side of the convex-concave glass spherical lens L1; the rest is the same. R represents the radius of curvature, nd represents the refractive index, and vd represents the Abbe number.

[0069] Table 5 Example 2 lens related parameters

[0070] f F# TTL DFOV f7 f8 f7 / f8 25mm 2.8 38.3mm 38.6° -48.54 39.75 -1.22

[0071] In Table 5, f represents the focal length of the lens, F# represents the aperture number of the lens (abbreviated as the aperture), TTL represents the total optical length of the lens, DFOV represents the maximum oblique field angle of the lens, f7 represents th...

Embodiment 3

[0078] The lens of this embodiment is framed with 8 lenses, and the optical parameters of the lens and each lens are as follows:

[0079] Table 7 embodiment 2 each lens relevant parameter

[0080]

[0081] In Table 7, L1R1 represents the mirror surface on the object side of the convex-concave glass spherical lens L1, and L1R2 represents the mirror surface on the image side of the convex-concave glass spherical lens L1; the rest are the same. R represents the radius of curvature, nd represents the refractive index, and vd represents the Abbe number.

[0082] Table 8 Example 3 lens related parameters

[0083]

[0084] In Table 8, f represents the focal length of the lens, F# represents the aperture number of the lens (abbreviated as the aperture), TTL represents the total optical length of the lens, DFOV represents the maximum oblique field angle of the lens, f7 represents the focal length of the fifth concave-convex glass spherical lens L7, and f8 represents the fifth T...

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Abstract

The present invention discloses a low-distortion high-pixel large-target plane machine vision lens. The lens comprises a front lens set and a rear lens set that are successively arranged along an optical axis from an object space to an image space. The front lens set comprises a first convex-concave structure glass spherical lens with a positive focal power, a second convex-concave structure glassspherical lens with a positive focal power, a third convex-concave structure glass spherical lens with a negative focal power, a fourth convex-concave structure glass spherical lens with a negative focal power, a concave-convex structure glass spherical lens with a positive focal power and a first double-convex structure glass spherical lens with a positive focal power that are successively arranged along the optical axis from the object space to the image space. The rear lens set comprises a fifth convex-concave structure glass spherical lens with a negative focal power and a second double-convex structure glass spherical lens with a positive focal power that are successively arranged along the optical axis from the object space to the image space. The lens provided in the present invention meets requirements of a high pixel and a large target plane, and is wide in working distance range, good and stable in analytical performance and small in system segment distortion.

Description

technical field [0001] The application belongs to the technical field of optical lenses, and in particular relates to a machine vision lens with low distortion, high pixels and large target surface. Background technique [0002] Generally, machine vision lenses have strict requirements on distortion, especially for machine vision lenses used for size detection. In addition, there are some machine vision lenses that require the working distance to be changed, which requires a wide range of distortion. In the case of object distance, the resolution and other performance of the lens must be stable, and it is also required that the resolution and other performance should have good performance in the case of temperature changes. [0003] In the prior art, for example, the patent application No. 201621237304.0 discloses a low-distortion close-range athermalization machine vision lens. The lens uses 8 lenses with an aperture of 2.08 and has a high cost performance. However, the len...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00
CPCG02B13/0015G02B13/005G02B13/006
Inventor 柳晓娜彭晓光陈姗姗郭悆汪卫华孟军
Owner 凤凰光学股份有限公司
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