Color selection lens

Abstract

The utility model discloses a color selection lens, and relates to the technical field of lenses. The color selection lens comprises a first meniscus lens, a second meniscus lens, a third meniscus lens, a balsaming lens and a biconvex lens which are sequentially arranged from an object plane to an image plane, the first meniscus lens, the second meniscus lens and the third meniscus lens form a front fixed group, and the balsaming lens and the biconvex lens form a rear fixed group; the diaphragm is arranged between the front fixing group and the rear fixing group; the front fixing group, the diaphragm and the rear fixing group are fixedly arranged in the first main cylinder; the focusing ring is connected with the first main cylinder through a lantern ring, and the lantern ring is provided with a multi-head tooth structure matched with the first main cylinder; and the focusing ring is clamped on the side surface of the second main cylinder and is rotatably connected with the second main cylinder. According to the color selection lens provided by the utility model, focusing is realized by arranging the short-focus lens combination and the diaphragm through cooperative movement of the multi-head tooth structure, the structure is compact, and focusing is accurate.

Description

Technical Field

[0001] This utility model relates to the field of lens technology, specifically to a color sorting lens. Background Technology

[0002] Color sorting, in industrial production, typically refers to the use of color recognition technology to filter out materials or products that do not meet color standards. Color sorting technology usually relies on optical sensors and image processing software to quickly and accurately identify color differences and automate the sorting process.

[0003] With the continuous development of automatic recognition technology, color sorting is being used more and more widely in various fields. However, the existing lens structure is not compact enough and cannot meet the needs of color sorting applications in some specific scenarios. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a color sorting lens that achieves focusing by setting a combination of short focal length lenses and an aperture stop, which move together through the cooperation of a multi-head tooth structure. The structure is compact and the focusing is accurate.

[0005] This utility model is implemented as follows:

[0006] A color sorting lens, comprising:

[0007] A first meniscus lens, a second meniscus lens, a third meniscus lens, a cemented lens, and a biconvex lens are arranged sequentially from the object plane to the image plane. The first meniscus lens, the second meniscus lens, and the third meniscus lens form the front fixed group, and the cemented lens and the biconvex lens form the rear fixed group.

[0008] An aperture is positioned between the front fixed group and the rear fixed group;

[0009] The first main tube, the front fixed group, the aperture and the rear fixed group are all fixed inside the first main tube;

[0010] A focusing ring is connected to the first main tube via a collar, the collar having a multi-tooth structure that matches the first main tube; focusing is achieved by rotating the focusing ring to drive the collar to rotate, thereby causing the first main tube to move back and forth.

[0011] The second main tube has a focusing ring that is mounted on the side of the second main tube and is rotatably connected to it.

[0012] Furthermore, the air gap between the first meniscus lens and the second meniscus lens is 0.6 mm, the air gap between the second meniscus lens and the third meniscus lens is 7.9 mm, the air gap between the third meniscus lens and the cemented lens is 35.4 mm, and the air gap between the cemented lens and the biconvex lens is 0.8 mm.

[0013] Furthermore, the cemented lens consists of a biconcave lens and a biconvex lens, with the object plane side being concave and the image plane side being convex.

[0014] Furthermore, the air gap between the biconvex lens and the imaging plane ranges from 10.19 to 24.5 mm.

[0015] Furthermore, the front fixing group is connected to the first main tube via the first lens frame, and the rear fixing group is connected to the first main tube via the second lens frame.

[0016] Furthermore, it also includes an aperture ring, which is connected to the moving ring via a guide pin, and is used to adjust the aperture value of the aperture.

[0017] Furthermore, the first main cylinder and the second main cylinder are provided with openings, which are greater than or equal to the adjustment range of the guide pin.

[0018] Furthermore, a first fixing element is provided on the aperture ring to fix the aperture size.

[0019] Furthermore, the second main tube is also provided with a second fixing member for fixing the collar and thus fixing the focal length.

[0020] Furthermore, it also includes an interface for connecting to the camera body.

[0021] The advantages of this invention are as follows: by setting a front fixed group composed of three meniscus lenses and a rear fixed group composed of a cemented lens and a biconvex lens, short focal length imaging is achieved; at the same time, the front and rear fixed groups and the aperture are all fixed on the first main tube, and focusing is achieved by moving back and forth through the cooperation of the multi-tooth structure. The structure is very compact and suitable for small color sorting applications. Furthermore, the front and rear fixed groups and the aperture move simultaneously, resulting in accurate focusing. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the cross-sectional structure of the lens in an embodiment of the present invention. Detailed Implementation

[0024] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings and specific embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Please see Figure 1 As shown, this utility model provides a color sorting lens, comprising:

[0028] A first meniscus lens 1, a second meniscus lens 2, a third meniscus lens 3, a cemented lens 4, and a biconvex lens 5 are arranged sequentially from the object plane to the image plane. The first meniscus lens 1, the second meniscus lens 2, and the third meniscus lens 3 form the front fixed group, and the cemented lens 4 and the biconvex lens 5 form the rear fixed group. In one specific embodiment, the cemented lens 5 consists of a biconcave lens and a biconvex lens, with a concave surface on the object plane side and a convex surface on the image plane side. The parameters of all lenses are as follows:

[0029]

[0030] The air gap between the first and second meniscus lenses is 0.6 mm, the air gap between the second and third meniscus lenses is 7.9 mm, the air gap between the third meniscus lens and the cemented lens is 35.4 mm, and the air gap between the cemented lens and the biconvex lens is 0.8 mm. Spacers are used between the two lenses in each group to ensure the corresponding air gaps.

[0031] The air gap between the biconvex lens and the imaging plane ranges from 10.19 to 24.5 mm.

[0032] Aperture 6 is positioned between the front fixing group and the rear fixing group.

[0033] The first main tube 7, the front fixed group, the aperture 6 and the rear fixed group are all fixed inside the first main tube 7;

[0034] The focusing ring 8 is connected to the first main tube 7 via a collar 9. The collar 9 is provided with a multi-tooth structure A that matches the first main tube 7. By rotating the focusing ring 8, the collar 9 is driven to rotate synchronously, thereby causing the first main tube 7 to move back and forth relative to the second main tube 10. This causes the front fixed group, aperture 6 and rear fixed group inside the first main tube 7 to move simultaneously, changing the distance between the aperture and the lens group and the imaging surface, thereby achieving focusing.

[0035] The second main cylinder 10 has a focusing ring 8 mounted on its side and rotatably connected to it. A limiting structure is provided on the second main cylinder 10 to restrict the rotation range of the focusing ring 8, thereby limiting the movement range of the first main cylinder 7.

[0036] In one possible implementation, the front fixing group is connected to the first main tube 7 via the first mirror frame 11, and the rear fixing group is connected to the first main tube 7 via the second mirror frame 12.

[0037] Specifically, it also includes an aperture ring 13, which is connected to the moving ring 15 via a guide pin 14, and is used to adjust the aperture value of the aperture 6. Since the aperture 6 is fixed to the first main cylinder 7 and moves back and forth relative to the second main cylinder 10 in this embodiment, preferably, in order not to affect the adjustment of the aperture value by the guide pin 14, both the first main cylinder 7 and the second main cylinder 10 are provided with openings, which are greater than or equal to the adjustment range of the guide pin 14.

[0038] In one possible implementation, the aperture ring 13 is provided with a first fixing member 16 for fixing the aperture size. The second main tube 10 is also provided with a second fixing member 17 for fixing the collar 9 to fix the focal length.

[0039] Specifically, it also includes interface 18 for connecting the lens to the camera body.

[0040] The lens in this embodiment has a focal length of f35mm and an aperture of F2.8, enabling manual focus and manual aperture adjustment. Image size: 1.1".

[0041] The working principle of this utility model is as follows:

[0042] Short-focus imaging is achieved by setting a front fixed group consisting of three meniscus lenses on the object side of the aperture 6 and a rear fixed group consisting of a cemented lens and a biconvex lens on the image side of the aperture 6. Rotating the focusing ring 8 causes the collar 9 to rotate synchronously. The multi-tooth structure A between the collar 9 and the first main cylinder 7 causes the first main cylinder 7 to move back and forth relative to the second main cylinder 10. This, in turn, moves the front fixed group, aperture 6, and rear fixed group within the first main cylinder 7 simultaneously, changing the distance between the aperture and the lens group and the imaging plane, thus achieving focusing. When the target focal length of the color sorter needs to be fixed, the collar 9 is fixed in place by the second fixing member 17. When the target aperture is adjusted, the aperture ring 13 is fixed in place by the first fixing member 16.

[0043] This invention achieves short-focus imaging by setting a front fixed group composed of three meniscus lenses and a rear fixed group composed of a cemented lens and a biconvex lens. At the same time, the front and rear fixed groups and the aperture are all fixed on the first main tube. Focusing is achieved by moving back and forth through the cooperation of a multi-tooth structure. The structure is very compact and suitable for small color sorting applications. Furthermore, the front and rear fixed groups and the aperture move simultaneously, ensuring accurate focusing.

[0044] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A color sorting lens, characterized in that, include: A first meniscus lens, a second meniscus lens, a third meniscus lens, a cemented lens, and a biconvex lens are arranged sequentially from the object plane to the image plane. The first meniscus lens, the second meniscus lens, and the third meniscus lens form the front fixed group, and the cemented lens and the biconvex lens form the rear fixed group. An aperture is positioned between the front fixed group and the rear fixed group; The first main tube, the front fixed group, the aperture and the rear fixed group are all fixed inside the first main tube; A focusing ring is connected to the first main tube via a collar, the collar having a multi-tooth structure that matches the first main tube; focusing is achieved by rotating the focusing ring to drive the collar to rotate, thereby causing the first main tube to move back and forth. The second main tube has a focusing ring that is mounted on the side of the second main tube and is rotatably connected to it.

2. The lens according to claim 1, characterized in that: The air gap between the first and second meniscus lenses is 0.6 mm, the air gap between the second and third meniscus lenses is 7.9 mm, the air gap between the third meniscus lens and the cemented lens is 35.4 mm, and the air gap between the cemented lens and the biconvex lens is 0.8 mm.

3. The lens according to claim 1 or 2, characterized in that: The cemented lens consists of a biconcave lens and a biconvex lens, with the object plane side being concave and the image plane side being convex.

4. The lens according to claim 1, characterized in that: The air gap between the biconvex lens and the imaging plane ranges from 10.19 to 24.5 mm.

5. The lens according to claim 1, characterized in that: The front fixing group is connected to the first main tube through the first lens frame, and the rear fixing group is connected to the first main tube through the second lens frame.

6. The lens according to claim 1, characterized in that: It also includes an aperture ring, which is connected to the moving ring via a guide pin and is used to adjust the aperture value of the aperture.

7. The lens according to claim 6, characterized in that: The first and second main cylinders are provided with openings, which are greater than or equal to the adjustment range of the guide pin.

8. The lens according to claim 6 or 7, characterized in that: The aperture ring is provided with a first fixing component for fixing the aperture size.

9. The lens according to claim 1, characterized in that: The second main tube is also provided with a second fixing member, which is used to fix the collar and thus fix the focal length.

10. The lens according to claim 1, characterized in that: It also includes an interface for connecting to the camera body.

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