4K high-definition industrial lens with focal length of 50mm
By designing an industrial lens with a 50mm focal length, adopting a variant of the classic double Gaussian structure and adding a positive meniscus lens, and optimizing the lens type and focal length range, the problem of insufficient resolution in grain screening by existing lenses was solved, achieving 4K high-definition imaging and improving screening accuracy.
Patent Information
- Application Number
- CN202520494405.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2026-03-03
- Estimated Expiration
- 2035-03-20
AI Technical Summary
Existing industrial lenses are unable to perform high-resolution identification and screening of numerous small grains such as rice and fruit in a short period of time, thus failing to meet the requirements of 4K high-definition imaging.
Design an industrial lens with a 50mm focal length, employing a classic double Gaussian structure variant with the addition of a positive meniscus lens. The lens optical system consists of a front lens group, an aperture stop, and a rear lens group. The lens type and focal length range are optimized to achieve 4K resolution with an imaging circle diameter of less than 5µm at 28mm.
It achieves 4K high-definition imaging, providing clearer image information and improving the accuracy of grain screening.
Smart Images
Figure CN223966757U_ABST
Abstract
Description
Technical Field:
[0001] The utility model relates to an industrial lens with a 50mm focal length and 4K high definition. Background Art:
[0002] Today, with the rapid development of industrial automation, machine vision inspection has been widely applied. And machine vision inspection requires an industrial lens to collect information through imaging. In the field of grain screening, it is necessary to identify and screen a large number of grains such as rice and fruits in a short time, which exactly requires the help of automated inspection. And staple foods such as rice and wheat with a large quantity and small volume pose higher requirements for the resolution of the industrial lens. Content of the Utility Model:
[0003] The purpose of the utility model is to provide an industrial lens with a 50mm focal length and 4K high definition.
[0004] To achieve the above purpose, the technical scheme adopted by the utility model is: an industrial lens with a 50mm focal length and 4K high definition, the optical system of the lens is provided with a front group of lenses, an aperture stop and a rear group of lenses in sequence along the optical axis from the object plane to the image plane; the front group of lenses is composed of a first lens, a second lens, and a first cemented lens in sequence along the optical axis from the object plane to the image plane, and the first cemented lens is composed of a third lens and a fourth lens cemented together; the rear group of lenses is composed of a second cemented lens and a seventh lens in sequence along the optical axis from the object plane to the image plane, and the second cemented lens is composed of a fifth lens and a sixth lens cemented together.
[0005] Further, the first lens is a positive meniscus lens; the second lens is a positive meniscus lens; the third lens is a positive meniscus lens; the fourth lens is a negative meniscus lens; the fifth lens is a double concave lens; the sixth lens is a double convex lens; the seventh lens is a double convex transmissive lens.
[0006] Further, the value range of the focal length fq of the front group of lenses is 50mm < fq < 70mm; the value range of the focal length fh of the rear group of lenses is 25mm < fh < 50mm, and the ratio of the focal length fq to the focal length fh is 1 < fq / fh < 2.5.
[0007] Further, the value range of the focal length fj1 of the first cemented lens is -40mm < fj1 < -60mm; the value range of the focal length fj2 of the second cemented lens is -100mm < fj2 < -160mm, and the ratio between the focal length fj1 of the first cemented lens and the focal length fj2 of the second cemented lens is 0.3 < fj1 / fj2 < 0.6.
[0008] Furthermore, the focal length f12 of the combination of the first lens and the second lens ranges from 30 mm < f12 < 50 mm, and the absolute value of the ratio of the focal lengths is within 0.5 < |f12 / fj1| < 1.2.
[0009] Furthermore, the focal length f7 of the seventh lens ranges from 25 mm < f7 < 50 mm, and the absolute value of the ratio of the focal lengths is within 0.2 < |f7 / fj2| < 0.5.
[0010] Compared with the prior art, the present utility model has the following effects: The present utility model is reasonably designed, has an imaging circle area with a diameter of 28 mm, and the minimum pixel point < 5 μm, meeting the requirements of an industrial lens for 4K imaging, providing clearer image information during the grain screening process, and improving the accuracy of screening. Description of the drawings:
[0011] Figure 1 is a schematic structural view of an embodiment of the present utility model;
[0012] Figure 2 is a schematic optical path view of an embodiment of the present utility model.
[0013] In the figure:
[0014] 1 - First lens; 2 - Second lens; 3 - Third lens; 4 - Fourth lens; 5 - Aperture; 6 - Fifth lens; 7 - Sixth lens; 8 - Seventh lens. Detailed implementation manners:
[0015] The present utility model will be further described in detail below in conjunction with the drawings and specific implementation manners.
[0016] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.
[0017] As Figures 1-2As shown, this utility model discloses a 50mm focal length 4K high-definition industrial lens, designed to meet the demand for higher resolution lenses for small-particle staple grains during grain screening. Specifically, the lens's optical system consists of a front lens group, an aperture stop 5, and a rear lens group arranged sequentially along the optical axis from the object plane to the image plane. The front lens group comprises a first lens 1, a second lens 2, and a first cemented lens arranged sequentially along the optical axis from the object plane to the image plane. The first cemented lens is composed of a third lens 3 and a fourth lens 4 cemented together. The rear lens group comprises a second cemented lens 8 and a seventh lens cemented together arranged sequentially along the optical axis from the object plane to the image plane. The second cemented lens is composed of a fifth lens 6 and a sixth lens 7. This lens achieves an imaging circle diameter of 28mm, a minimum imaging point of <5µm, and a resolution of 4K, providing clearer image information and improving screening accuracy during grain screening.
[0018] In this embodiment, the first lens 1 is a positive meniscus lens; the second lens 2 is a positive meniscus lens; the third lens 3 is a positive meniscus lens; the fourth lens 4 is a negative meniscus lens; the fifth lens 6 is a biconcave lens; the sixth lens 7 is a biconvex lens; and the seventh lens 8 is a biconvex lens. A variation of the classic double Gaussian structure is used, with an additional positive meniscus lens at the foremost section to reduce spherical aberration, thereby improving the lens's optical performance and enabling it to meet the 4K resolution requirement.
[0019] In this embodiment, the focal length fq of the front lens group is in the range of 50mm. <fq<70mm。
[0020] In this embodiment, the focal length fh of the rear lens group ranges from 25mm. <fq<50mm。
[0021] In this embodiment, the ratio of the focal length fq of the front lens to the focal length fh of the rear lens is within 1. <fq / fh<2.5。
[0022] In this embodiment, the focal length fj1 of the first cemented lens ranges from -40mm. <fj1<-60mm。
[0023] In this embodiment, the focal length fj2 of the second cemented lens ranges from -100mm. <fj2<-160mm。
[0024] In this embodiment, the ratio between the focal length fj1 of the first cemented lens and the focal length fj2 of the second cemented lens is 0.3. <fj1 / fj2<0.6。
[0025] In this embodiment, the focal length f12 of the combination of the first lens 1 and the second lens 2 is in the range of 30mm. <f12<50mm。
[0026] In this embodiment, the absolute value of the ratio of the focal length f12 of the combination of the first lens 1 and the second lens 2 to the focal length fj1 of the first cemented lens is 0.5 < |f12 / fj1| < 1.2.
[0027] In this embodiment, the focal length f7 of the seventh lens 8 is in the range of 25mm. <f7<50mm。
[0028] In this embodiment, the absolute value of the ratio of the focal length f7 of the seventh lens 8 to the focal length fj2 of the second cemented lens is 0.2 < |f7 / fj2| < 0.5.
[0029] Optical component parameters: (r1 refers to the surface radius of curvature along the object plane direction of the optical path, r2 refers to the surface radius of curvature along the image plane direction of the optical path, and D refers to the center thickness. Unit: mm)
[0030] First lens: r1 = 33.218, r2 = 65.924, material: H-LAK51, D = 3.572.
[0031] Air gap 5.134;
[0032] The second lens has the following parameters: r1 = 28.247, r2 = 64.494, material: H-LAK59A, D = 3.286.
[0033] Air gap 0.4;
[0034] The third lens has the following parameters: r1 = 18.914, r2 = 101.785, material: H-LAK59A, D = 5.882.
[0035] Fourth lens: r1 = 101.785, r2 = 11.922, material: H-ZLAF56B, D = 2
[0036] Air gap 4.48;
[0037] aperture
[0038] Air gap 9.121
[0039] Fifth lens: r1 = -15.572, r2 = 36.486, material: H-ZF12, D = 2;
[0040] The sixth lens has the following properties: r1 = 36.486, r2 = -28.937, material: H-LAF52, D = 7.232.
[0041] Air gap 0.1;
[0042] The seventh lens has the following parameters: r1 = 73.397, r2 = -73.397, material: H-ZLAF92, D = 6.
[0043] Back focal length 20.392.
[0044] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral forming process).
[0045] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.
[0046] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.
[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.
Claims
1. An industrial lens of 50mm focal length 4K high definition, characterized in that: An optical system of the lens is provided with a front lens group, a diaphragm and a rear lens group in sequence along an optical axis from an object plane to an image plane; the front lens group is composed of a first lens, a second lens and a first cemented lens in sequence along the optical axis from the object plane to the image plane, the first cemented lens is composed of a third lens and a fourth lens; the rear lens group is composed of a second cemented lens and a seventh lens in sequence along the optical axis from the object plane to the image plane, the second cemented lens is composed of a fifth lens and a sixth lens.
2. The 50mm focal length 4K high definition industrial lens of claim 1, wherein: The first lens is a positive meniscus lens; the second lens is a positive meniscus lens; the third lens is a positive meniscus lens; the fourth lens is a negative meniscus lens; the fifth lens is a double-concave lens; The sixth lens is a double-convex lens; the seventh lens is a double-convex lens.
3. The 50mm focal length 4K high definition industrial lens of claim 1, wherein: The focal length fq of the front lens group is in the range of 50mm < fq < 70mm; the focal length fh of the rear lens group is in the range of 25mm < fq < 50mm, and the ratio of the focal length fq and the focal length fh is in the range of 1 < fq / fh < 2.
5.
4. The 50mm focal length 4K high definition industrial lens of claim 1, wherein: The focal length fj1 of the first cemented lens is in the range of -40mm < fj1 < -60mm; the focal length fj2 of the second cemented lens is in the range of -100mm < fj2 < -160mm, and the ratio of the focal length fj1 of the first cemented lens and the focal length fj2 of the second cemented lens is in the range of 0.3 < fj1 / fj2 < 0.
6.
5. The 50mm focal length 4K high definition industrial lens of claim 4, wherein: The focal length f12 of the combination of the first lens and the second lens is in the range of 30mm < f12 < 50mm, and the absolute value of the ratio of the focal length f12 and the focal length fj1 of the first cemented lens is in the range of 0.5 < |f12 / fj1| < 1.
2.
6. The 50mm focal length 4K high definition industrial lens of claim 4, wherein: The focal length f7 of the seventh lens is in the range of 25mm < f7 < 50mm, and the absolute value of the ratio of the focal length f7 and the focal length fj2 of the second cemented lens is in the range of 0.2 < |f7 / fj2| < 0.5.