1.1-inch large target surface 16mm focal length high-definition low-distortion industrial lens and manufacturing method thereof

Abstract

The present invention provides a 1.1-inch large target surface 16mm focal length high-definition low-distortion industrial lens and a manufacturing method thereof. The optical system of the lens comprises a front lens group A with negative focal power and a rear lens group B with positive focal power in sequence along the incident direction of light from left to right; the front lens group A is composed of a positive crescent lens A1, a negative crescent lens A2, a biconcave lens A3, a biconcave lens A4 and a biconvex lens A5, which are closely connected, and a positive crescent lens A6; the rear lens group B is composed of The lens is composed of a second cemented group of a positive crescent lens B1 and a negative crescent lens B2, a biconvex lens B3, a biconvex lens B4 and a negative crescent lens B5. The lens adopts a half-group movable focusing structure. Its close-up distance can reach 80mm object distance and it has the characteristics of large target surface, high resolution and low distortion. It can provide high-resolution and clear imaging with better than 12 million pixels for machine vision systems. The industrial lens can be used with mainstream chips such as 1.1-inch, 1 / 1.2-inch and 2 / 3-inch.

Description

Technical Field

[0001] The invention relates to a 1.1-inch large target surface, 16mm focal length, high-definition and low-distortion industrial lens and a manufacturing method thereof. Background Art

[0002] With the continuous iterative development of industrial lenses, small industrial lenses such as 2 / 3-inch can no longer meet the inspection needs of large-scale machinery manufacturing, display manufacturing and other industries. They need chips with 1.1-inch or larger target surfaces to meet the needs of large-scale manufacturing industries. In addition, with the continuous competition among chip manufacturers such as Sony, Aptina, and OmniVision, higher requirements are placed on their own megapixel high-resolution CMOS image sensors. Therefore, further improving lens performance standards has become an industry trend. Summary of the invention

[0003] The present invention improves the above-mentioned problem, that is, the technical problem to be solved by the present invention is that the existing lens performance standards cannot meet the requirements of the megapixel high-resolution CMOS image sensor.

[0004] The specific implementation scheme of the present invention is: a 1.1-inch large target surface 16mm focal length high-definition low-distortion industrial lens, the optical system of the lens includes a front lens group A with negative optical power and a rear lens group B with positive optical power in the incident direction of light from left to right;

[0005] The front lens group A is composed of a first cemented group of positive meniscus lens A1, negative meniscus lens A2, biconcave lens A3, biconcave lens A4 and biconvex lens A5, which are arranged in sequence from left to right along the incident light, and a positive meniscus lens A6;

[0006] The rear lens group B is composed of a second cemented group of positive meniscus lens B1 and negative meniscus lens B2, which are arranged in sequence from left to right along the incident light, a biconvex lens B3, a biconvex lens B4, and a negative meniscus lens B5.

[0007] A diaphragm C is provided between the front lens group A and the rear lens group.

[0008] Furthermore, the air gap between the positive meniscus lens A1 and the negative meniscus lens A2 in the front lens group A is: 0.10 mm;

[0009] The air gap between the negative meniscus lens A2 and the biconcave lens A3 in the front lens group A is 5.6 mm;

[0010] The air gap between the biconcave lens A3 and the first cemented lens group in the front lens group A is 3.1 mm;

[0011] The air gap between the first cemented group in the front lens group A and the positive crescent lens A6 is: 0.1 mm;

[0012] The air gap between the front lens group A and the rear lens group B varies from 13.7 mm to 16.7 mm.

[0013] The air gap between the front lens group A and the variable aperture C is: 6.0 mm;

[0014] The air gap between the variable aperture C and the rear lens group B varies from 7.7 mm to 10.7 mm.

[0015] The air gap between the second cemented group in the rear lens group B and the biconvex lens B3 is 0.10 mm;

[0016] The air gap between the biconvex lens B3 and the biconvex lens B4 in the rear lens group B is 0.10 mm;

[0017] The air gap between the biconvex lens B4 and the negative meniscus lens B5 in the rear lens group B is 0.10 mm.

[0018] Further, the lens also includes a lens assembly fixed outside the optical system, the lens assembly includes a main lens barrel, the inner cavity of the main lens barrel is sequentially provided with a front lens barrel and a rear lens barrel along the incident direction of light, the inner surface of the front lens barrel has multiple levels of step surfaces for limiting each lens of the front lens group A, and the front lens barrel is sequentially fixed with a front pressure ring, a positive crescent lens A1, a spacer A, a negative crescent lens A2, a biconcave lens A3, a first cemented group of biconcave lens A4 and a biconvex lens A5, a spacer B, and a positive crescent lens A6 along the incident direction of light;

[0019] The rear lens barrel is fixed with a second cemented group of positive meniscus lens B1 and negative meniscus lens B2 in close contact, a spacer C, a biconvex lens B3, a spacer D, a biconvex lens B4, a spacer E, a negative meniscus lens B5 and a rear pressure ring in sequence along the incident direction of light.

[0020] The aperture C is fixed in the aperture sleeve via a set screw. The aperture sleeve is located in the main lens barrel and is threadedly connected to the front lens barrel. The aperture sleeve is connected to an aperture adjustment ring sleeved on the outside of the main lens barrel via an aperture guide pin. The rear end of the main lens barrel is fixedly connected to a connecting seat. The connecting seat is fixed to the main lens barrel via a tapered end set screw that penetrates the surface of the connecting seat and is inserted into the main lens barrel. The aperture adjustment ring is limited between the connecting seat and the raised convex portion on the outer periphery of the main lens barrel. The side wall of the rear lens barrel has two symmetrical annular straight guide grooves to limit the moving distance of the aperture sleeve. The aperture adjustment ring is also threadedly connected to an iris locking pin that presses against the main lens barrel.

[0021] Furthermore, a focusing wheel is threadedly connected between the main lens barrel and the rear lens barrel, the thread direction between the focusing wheel and the main lens barrel is opposite to the thread direction between the focusing wheel and the rear lens barrel, the focusing wheel is connected to the focusing ring via a focusing ring tapered end set screw, and the outside of the main lens barrel has a focusing wheel locking pin that is threadedly matched for tightening the focusing wheel.

[0022] Furthermore, the front end of the front lens barrel is horn-shaped, and the main lens barrel is also provided with a main lens barrel limiting pin for limiting the moving distance of the rear lens barrel.

[0023] Furthermore, the inner walls of the spacer rings A and B are both inclined surfaces, thereby reducing the refraction surface of the incident light.

[0024] Furthermore, the outer side of the connecting seat has an external thread that can be connected to the camera.

[0025] Furthermore, the optical system of the lens includes, along the incident direction of light from left to right, a front lens group A with negative optical power and a rear lens group B with positive optical power;

[0026] The present invention also includes a method for manufacturing a 1.1-inch large target surface 16mm focal length high-definition low-distortion industrial lens, wherein the front lens group A is composed of a positive crescent lens A1, a negative crescent lens A2, a biconcave lens A3, a biconcave lens A4 and a biconvex lens A5, which are arranged in sequence from left to right along the incident light, and a first cemented group, and a positive crescent lens A6;

[0027] The rear lens group B is composed of a second cemented group of positive meniscus lens B1 and negative meniscus lens B2, which are arranged in sequence from left to right along the incident light, a biconvex lens B3, a biconvex lens B4, and a negative meniscus lens B5.

[0028] A diaphragm C is provided between the front lens group A and the rear lens group.

[0029] Furthermore, the air gap between the positive meniscus lens A1 and the negative meniscus lens A2 in the front lens group A is: 0.10 mm;

[0030] The air gap between the negative meniscus lens A2 and the biconcave lens A3 in the front lens group A is 5.6 mm;

[0031] The air gap between the biconcave lens A3 and the first cemented lens group in the front lens group A is 3.1 mm;

[0032] The air gap between the first cemented group in the front lens group A and the positive crescent lens A6 is: 0.1 mm;

[0033] The air gap between the front lens group A and the rear lens group B varies from 13.7 mm to 16.7 mm.

[0034] The air gap between the front lens group A and the variable aperture C is: 6.0 mm;

[0035] The air gap between the variable aperture C and the rear lens group B varies from 7.7 mm to 10.7 mm.

[0036] The air gap between the second cemented group in the rear lens group B and the biconvex lens B3 is 0.10 mm;

[0037] The air gap between the biconvex lens B3 and the biconvex lens B4 in the rear lens group B is 0.10 mm;

[0038] The air gap between the biconvex lens B4 and the negative meniscus lens B5 in the rear lens group B is 0.10 mm.

[0039] Compared with the prior art, the present invention has the following beneficial effects: the lens of the present invention adopts a half-group movable focusing structure, its close-up distance can reach 80mm object distance and has the characteristics of large target surface, high resolution, low distortion, etc., which can provide high-resolution and clear imaging with better than 12 million pixels for machine vision systems. The industrial lens can be matched with mainstream chips such as 1.1 inches, 1 / 1.2 inches, and 2 / 3 inches. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the focusing optical path structure of the present invention.

[0041] Figure 2 It is a schematic diagram of the structure after the focusing optical path of the present invention is zoomed.

[0042] Figure 3 This is a general diagram of the lens structure of the present invention.

[0043] Figure 4 MTF curve diagram of the embodiment of the present invention.

[0044] Figure 5 Distortion change curve of the embodiment of the present invention.

[0045] 1. Front lens barrel 2. Focusing ring 3. M1.6*2 cone-end set screw 4. Focusing wheel 5. Rear lens barrel 6. Main lens barrel 7. Aperture guide pin 8. Aperture adjustment ring 9. Symmetrical annular straight guide groove 10. M1.6*3.5 guide pin 11. M1.6*2 cone-end set screw 12. Connecting seat 13. Spacer E 14. Rear pressure ring 15. Lens B5 16. Lens B4 17. Lens B3 18. Lens B2 19. Lens B1 20. Spacer D 21. Spacer C 22. Aperture sleeve 23. Variable aperture 24. M1.6*2 cone-end set screw 25. Symmetrical annular straight guide groove 26. Aperture locking pin 27. M1.6*4.5 guide pin 28. A6 piece 29. Focus wheel locking pin 30. Spacer B 31. Lens A5 32. Lens A4 33. Lens A3 34. Lens A2 35. Spacer A 36. Front pressure ring 37. Lens A1 38. Sensor. DETAILED DESCRIPTION

[0046] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] like Figures 1 to 5 As shown, the specific implementation scheme of the present invention is: a 1.1-inch large target surface 16mm focal length high-definition low-distortion industrial lens, the optical system of the lens includes a front lens group A with negative optical power and a rear lens group B with positive optical power in the incident direction of light from left to right;

[0048] The front lens group A is composed of a first cemented group of positive meniscus lens A1, negative meniscus lens A2, biconcave lens A3, biconcave lens A4 and biconvex lens A5, which are arranged in sequence from left to right along the incident light, and a positive meniscus lens A6;

[0049] The rear lens group B is composed of a second cemented group of positive meniscus lens B1 and negative meniscus lens B2, which are arranged in sequence from left to right along the incident light, a biconvex lens B3, a biconvex lens B4, and a negative meniscus lens B5.

[0050] A diaphragm C is provided between the front lens group A and the rear lens group.

[0051] Furthermore, the air gap between the positive meniscus lens A1 and the negative meniscus lens A2 in the front lens group A is: 0.10 mm;

[0052] The air gap between the negative meniscus lens A2 and the biconcave lens A3 in the rear lens group A is 5.6 mm;

[0053] The air gap between the biconcave lens A3 and the first cemented lens group in the front lens group A is 3.1 mm;

[0054] The air gap between the first cemented group in the front lens group A and the positive crescent lens A6 is: 0.1 mm;

[0055] The air gap between the front lens group A and the rear lens group B varies from 13.7 mm to 16.7 mm.

[0056] The air gap between the front lens group A and the variable aperture C is: 6.0 mm;

[0057] The air gap between the variable aperture C and the rear lens group B varies from 7.7 mm to 10.7 mm.

[0058] The air gap between the second cemented group in the rear lens group B and the biconvex lens B3 is 0.10 mm;

[0059] The air gap between the biconvex lens B3 and the biconvex lens B4 in the rear lens group B is 0.10 mm;

[0060] The air gap between the biconvex lens B4 and the negative meniscus lens B5 in the rear lens group B is 0.10 mm.

[0061] This industrial lens can be used with mainstream chips such as 1.1-inch, 1 / 1.2-inch, and 2 / 3-inch.

[0062] In this embodiment, the parameters of each lens are shown in the following table:

[0063]

[0064] In this embodiment, the lens housing structure is designed as follows Figure 4 As shown: the lens adopts a half-group movable focusing structure. In order to achieve a close-up distance of 80mm, an 8-head screw thread structure design is adopted at the front end of the lens structure; in order to ensure that the half-group movable focusing is not affected when the diaphragm is actuated, an diaphragm sleeve is designed in the middle of the lens structure to carry the diaphragm; in order to ensure the 3mm stroke of the movable focusing and avoid the circular rotation of the front and rear group lens barrels along the optical axis when focusing, a symmetrical annular straight guide groove limit slider adjustment mechanism is adopted at the rear end of the lens structure to limit it; in order to ensure the accuracy of the object distance during focusing, the adjustment stroke limit adopts a convex block and groove matching limit structure; in order to ensure the concentricity and consistency of the assembly of various components and the matching of lenses, the lens structure design has carried out strict tolerance control on the hole-axis matching surface, inner and outer diameter dimensions, and screw thread matching, so that the matching of various mechanical structures is tighter and more stable, and the coaxiality of the matching of the front and rear mechanical parts and the consistency of the lens assembly optical axis are ensured, thereby meeting the optical design requirements.

[0065] The technical indicators achieved by the present invention are as follows:

[0066] ①Focal length: f´=16mm

[0067] ② Close shooting distance: MOD = 80mm

[0068] ③Distortion: ≤-0.09%

[0069] ④Relative aperture: D / f´=1 / 2.8

[0070] ⑤ Field of view: 2ω=58°

[0071] ⑥ Resolution: better than 12 million pixels

[0072] ⑦Total length of optical path:∑≤68.0±0.1mm

[0073] ⑧Applicable spectral range: 450nm~650nm

[0074] ⑨Lens dimensions: φ39mm×61mm

[0075] In this optical path design, the optical glass materials of eleven elements and nine groups in the front and rear groups are reasonably selected, and the optical power of the front and rear groups is reasonably allocated to perfectly correct various aberrations, high and low temperatures of the lens, so that the resolution of the lens can reach 12 million pixels, and the MTF value of the lens is 150lp / mm≥0.45 (such as Figure 1 ), meeting the high resolution requirements of industrial inspection lenses.

[0076] In this embodiment, the lens further comprises a lens assembly fixed outside the optical system, the lens assembly comprises a main lens barrel, the inner cavity of the main lens barrel is provided with a front lens barrel and a rear lens barrel in sequence along the incident direction of light, the inner surface of the front lens barrel has multiple step surfaces for limiting the positions of the lenses of the front lens group A, and the front lens barrel is provided with a front pressure ring, a positive crescent lens A1, a spacer A, a negative crescent lens A2, a biconcave lens A3, a first cemented group of biconcave lens A4 and a biconvex lens A5 in close contact, a spacer B, and a positive crescent lens A6 in sequence along the incident direction of light;

[0077] The rear lens barrel is fixed with a second cemented group of positive meniscus lens B1 and negative meniscus lens B2 in close contact, a spacer C, a biconvex lens B3, a spacer D, a biconvex lens B4, a spacer E, a negative meniscus lens B5 and a rear pressure ring in sequence along the incident direction of light.

[0078] The specific structure of each lens component is as follows:

[0079] Front lens barrel: This mechanical part is mainly used to assemble the front group of 6 lenses and 5 groups of lenses, as well as spacer A, spacer B and front pressure ring. The one-piece processing design of the inner wall of the lens barrel effectively ensures the flatness of the supporting surface of each lens and the coaxiality of the inner diameter of the mechanical part and the lens assembly. Among them, the spacer A, spacer B and the supporting part of the front lens group are designed to be non-chamfered, which effectively ensures the air gap between the A1 lens and the A2 lens, and the first glued group and A5, and improves the coaxiality of the optical axis of the front group of 6 lenses; the inner walls of the two spacers are both designed with a bevel, which can effectively reduce the refraction surface of the incident light, thereby blocking the refraction of invalid light and eliminating the influence of stray light on the overall imaging quality of the lens. The front pressure ring is designed to cooperate with the front lens barrel to ensure the coaxiality and stability of the assembly of the front group of 6 lenses and 5 groups of lenses.

[0080] Rear lens barrel: This mechanical part is mainly used to assemble the rear group of 5 lenses in 4 groups, as well as spacer C, spacer D, spacer E and rear pressure ring. The three spacers are also designed to ensure the air gap between the rear group of 4 lenses and block the refraction of invalid light, eliminating the influence of stray light on the overall imaging quality of the lens. The rear pressure ring is designed to cooperate with the rear lens barrel to ensure the coaxiality and stability of the assembly of the rear group of 5 lenses in 4 groups. In order to prevent the optical path system from being more stable when the lens is focused, two symmetrical annular straight guide groove limit slider adjustment mechanisms are designed on the side wall of the rear lens barrel. Through 2 M1.6*4.5 guide pins, the aperture sleeve is locked and limited in the limit grooves on both sides of the rear lens barrel. The aperture sleeve is fastened to the front lens barrel through screw threads, thereby ensuring the coaxiality of the front and rear optical paths when focusing;

[0081] Connector: This mechanical part is designed with precise verticality and coaxiality. The inner hole of the connector and the outer shaft of the main lens barrel are matched through the bearing surface and fixed with 3 M1.6*2 cone-end set screws, thus realizing the half-group moving focusing method of the mechanical structure design. The outer side of the connector is also designed with 1-32UNF external threads to match the mainstream industrial cameras on the market. At the same time, considering the overall aesthetics of the lens, its appearance design also uses copper chrome plating technology to make it more beautiful and atmospheric.

[0082] Aperture sleeve and variable iris: To realize the aperture adjustment function of the lens, an integrated variable iris is used. The variable iris is locked inside the iris sleeve with two M1.6*2 cone-end set screws. The integrated variable iris design not only simplifies its installation process but also improves the overall stability of the lens. At the same time, in order to meet the requirements of optical design for different aperture sizes, the variable iris is locked to the iris adjustment ring with an iris guide pin and embedded in the annular groove of the iris end crank handle, so that the iris adjustment ring is rotated through light to drive the iris guide pin and the iris crank handle to form a linkage, and different iris opening and closing angles are used to meet the use environment of the lens; in order to prevent the iris from exceeding the use range, a 42° angle limit slot is designed on the main lens barrel to limit the extreme use of the iris opening and closing.

[0083] Main lens barrel: In order to prevent the light path system from rotating in a circle along the optical axis when the lens is focused, the symmetrical annular straight guide groove limit slider adjustment mechanism on the side wall of the main lens barrel is used to lock and limit the rear lens barrel in the limit grooves on both sides of the main lens barrel through 2 M1.6*3.5 guide pins, thereby limiting the light path system from rotating along the optical axis when the lens is focused; in order to enhance the practicality of the lens, relative aperture value markings corresponding to different aperture positions are also designed on the outer surface of the main lens barrel. Its main function is to adjust the iris adjustment ring to the required aperture position in different application scenarios and tighten the iris adjustment ring through the iris locking pins to achieve the purpose of use.

[0084] Focusing wheel: In order to make the lens focus more precise and stable, a focusing wheel is designed. The inner thread of the focusing wheel adopts a left-handed 8-thread fine-focusing structure, and the outer thread adopts a single-thread thread for matching transmission. Its design can make the focusing more stable and delicate. Its main function is that the 8-thread teeth of the focusing wheel cooperate with the 8-thread teeth of the rear lens barrel, and the focusing wheel is connected to the focusing ring through 3 M1.6*2 cone-end set screws to form an integrated linkage design. Therefore, by rotating the focusing ring clockwise and counterclockwise to drive the focusing wheel linkage, the rear lens barrel moves horizontally forward and backward to achieve the purpose of focusing. In order to prevent the rear lens barrel from rotating along the optical axis when focusing, symmetrical annular straight guide groove limit slider adjustment mechanisms are designed on both sides of the outer wall of the main lens barrel and the outer wall of the rear lens barrel, so that the rear lens barrel moves linearly along the straight guide groove during focusing and ensures its focusing stroke. At the same time, it is equipped with a focusing wheel locking nail to fix the focusing position.

[0085] Focus ring: In order to ensure the accuracy of the object distance during manual focusing, the adjustment travel limit adopts a convex block and groove matching limit structure; specifically, a 123° limit groove is added to the focus ring, and a 15° limit block is added to the main lens barrel to ensure the focusing travel of the lens structure. At the same time, in order to ensure the accuracy of focusing, a laser small white dot process is also added to the focus ring to match the focus position corresponding to different object distances on the main lens barrel.

[0086] Aperture adjustment ring: In order to ensure the accuracy of aperture opening and closing, the aperture adjustment ring is also equipped with a laser white dot process to match the different aperture positions and relative aperture values ​​on the main lens barrel. At the same time, in order to fix the aperture size, an aperture locking pin is also provided to fix the aperture position.

[0087] If the words "first", "second" and so on are used in this article to limit components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of description to distinguish the components. Unless otherwise stated, the above words have no special meaning.

[0088] At the same time, if the above-mentioned invention discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connected by bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except when it is obviously impossible to use an integrated molding process).

[0089] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the present invention include states or shapes that are approximate, similar, or close to them.

[0090] Any component provided by the present invention may be assembled from a plurality of separate components, or may be a separate component manufactured by an integral forming process.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A 1.1-inch large target surface 16mm focal length high-definition low-distortion industrial lens, characterized in that: The optical system of the lens is composed of a front lens group A with negative optical power and a rear lens group B with positive optical power, which are arranged in sequence along the incident direction of light from left to right; The front lens group A is composed of a first cemented group of positive meniscus lens A1, negative meniscus lens A2, biconcave lens A3, biconcave lens A4 and biconvex lens A5, which are arranged in sequence from left to right along the incident light, and a positive meniscus lens A6; The rear lens group B is composed of a second cemented group of positive meniscus lens B1 and negative meniscus lens B2, which are arranged in sequence from left to right along the incident light, a biconvex lens B3, a biconvex lens B4, and a negative meniscus lens B5. A diaphragm C is provided between the front lens group A and the rear lens group; The air gap between the positive meniscus lens A1 and the negative meniscus lens A2 in the front lens group A is 0.10 mm; The air gap between the negative meniscus lens A2 and the biconcave lens A3 in the front lens group A is 5.6 mm; The air gap between the biconcave lens A3 and the first cemented lens group in the front lens group A is 3.1 mm; The air gap between the first cemented group in the front lens group A and the positive crescent lens A6 is: 0.1 mm; The air gap between the front lens group A and the rear lens group B varies from 13.7 mm to 16.7 mm. The air gap between the front lens group A and the variable aperture C is: 6.0 mm; The air gap between the variable aperture C and the rear lens group B varies from 7.7 mm to 10.7 mm. The air gap between the second cemented group in the rear lens group B and the biconvex lens B3 is 0.10 mm; The air gap between the biconvex lens B3 and the biconvex lens B4 in the rear lens group B is: 0.10mm.

2. The 1.1-inch large-target-area 16mm-focal-length high-definition low-distortion industrial lens according to claim 1, characterized in that: The lens also includes a lens assembly fixed outside the optical system, the lens assembly includes a main lens barrel, the inner cavity of the main lens barrel is sequentially provided with a front lens barrel and a rear lens barrel along the incident direction of light, the inner surface of the front lens barrel has multiple step surfaces for limiting each lens of the front lens group A, and the front lens barrel is sequentially fixed with a front pressure ring, a positive crescent lens A1, a spacer A, a negative crescent lens A2, a biconcave lens A3, a first cemented group of biconcave lens A4 and a biconvex lens A5, a spacer B, and a positive crescent lens A6 along the incident direction of light; The rear lens barrel is fixed with a second cemented group of positive meniscus lens B1 and negative meniscus lens B2 in close contact, a spacer C, a biconvex lens B3, a spacer D, a biconvex lens B4, a spacer E, a negative meniscus lens B5 and a rear pressure ring in sequence along the incident direction of light. The aperture C is fixed in the aperture sleeve via a set screw. The aperture sleeve is located in the main lens barrel and is threadedly connected to the front lens barrel. The aperture sleeve is connected to an aperture adjustment ring sleeved on the outside of the main lens barrel via an aperture guide pin. The rear end of the main lens barrel is fixedly connected to a connecting seat. The connecting seat is fixed to the main lens barrel via a tapered end set screw that penetrates the surface of the connecting seat and is inserted into the main lens barrel. The aperture adjustment ring is limited between the connecting seat and the raised convex portion on the outer periphery of the main lens barrel. The side wall of the rear lens barrel has two symmetrical annular straight guide grooves to limit the moving distance of the aperture sleeve. The aperture adjustment ring is also threadedly connected to an iris locking pin that presses against the main lens barrel.

3. The 1.1-inch large target surface 16mm focal length high-definition low-distortion industrial lens according to claim 2, characterized in that: A focusing wheel is threadedly connected between the main lens barrel and the rear lens barrel, and the thread direction between the focusing wheel and the main lens barrel is opposite to the thread direction between the focusing wheel and the rear lens barrel. The focusing wheel is connected to the focusing ring via a set screw at the conical end of the focusing ring, and the outside of the main lens barrel has a focusing wheel locking pin that is threadedly matched for tightening the focusing wheel.

4. The 1.1-inch large-target-area 16mm-focal-length high-definition low-distortion industrial lens according to claim 3, characterized in that: The front end of the front lens barrel is in a trumpet shape, and a main lens barrel limiting pin for limiting the moving distance of the rear lens barrel is also provided in the main lens barrel.

5. The 1.1-inch large target surface 16mm focal length high-definition low-distortion industrial lens according to claim 2, characterized in that: The inner walls of the spacer rings A and B are both inclined surfaces, thereby reducing the refraction surface of the incident light.

6. The 1.1-inch large target surface 16mm focal length high-definition low-distortion industrial lens according to claim 2, characterized in that: The outer side of the connecting seat is provided with an external thread which can be connected with the camera.

7. A method for manufacturing a 1.1-inch large target surface 16mm focal length high-definition low-distortion industrial lens, characterized in that: The optical system of the lens is composed of a front lens group A with negative optical power and a rear lens group B with positive optical power, which are arranged in sequence along the incident direction of light from left to right; The front lens group A is composed of a first cemented group of positive meniscus lens A1, negative meniscus lens A2, biconcave lens A3, biconcave lens A4 and biconvex lens A5, which are arranged in sequence from left to right along the incident light, and a positive meniscus lens A6; The rear lens group B is composed of a second cemented group of positive meniscus lens B1 and negative meniscus lens B2, which are arranged in sequence from left to right along the incident light, a biconvex lens B3, a biconvex lens B4, and a negative meniscus lens B5. A diaphragm C is provided between the front lens group A and the rear lens group; The air gap between the positive meniscus lens A1 and the negative meniscus lens A2 in the front lens group A is 0.10 mm; The air gap between the negative meniscus lens A2 and the biconcave lens A3 in the front lens group A is 5.6 mm; The air gap between the biconcave lens A3 and the first cemented lens group in the front lens group A is 3.1 mm; The air gap between the first cemented group in the front lens group A and the positive crescent lens A6 is: 0.1 mm; The air gap between the front lens group A and the rear lens group B varies from 13.7 mm to 16.7 mm. The air gap between the front lens group A and the variable aperture C is: 6.0 mm; The air gap between the variable aperture C and the rear lens group B varies from 7.7 mm to 10.7 mm. The air gap between the second cemented group in the rear lens group B and the biconvex lens B3 is 0.10 mm; The air gap between the biconvex lens B3 and the biconvex lens B4 in the rear lens group B is: 0.10mm.

Images