Lens barrel, telecentric lens and camera module

Abstract

The embodiment of the utility model relates to the technical field of telecentric lenses, and provides a lens barrel, a telecentric lens and a camera module, the lens barrel of the telecentric lens comprises a first lens barrel, a switching assembly and a second lens barrel which are arranged from an object side to an image side, the first lens barrel is used for placing a first lens group, and the second lens barrel is used for placing a second lens group; the switching assembly has a straight-through connection state and a corner connection state, when the switching assembly is in the straight-through connection state, the axis of the first lens cone is parallel to the axis of the second lens cone, and the distance between the first lens group and the second lens group is a first optical path; when the switching assembly is in a corner connection state, the axis of the first lens cone is perpendicular to the axis of the second lens group, and the distance between the first lens group and the second lens group is a second optical path; the second optical path is equal to the first optical path. The lens barrel has a straight barrel connection state and a corner connection state, and achieves the purposes of adapting to different placement spaces and meeting the optical performance consistency requirement of the telecentric lens.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of telecentric lens, and in particular to a lens barrel, a telecentric lens and a camera module. BACKGROUND

[0002] Machine vision detection technology is widely applied to various aspects of production and manufacturing. In the appearance defect detection link of many industries, machine vision detection technology plays an important role, such as in the fields of circuit boards, semiconductor chips, display panels, food packaging, etc.

[0003] With the continuous improvement of industrial intelligence level, the precision requirement for product defect detection is getting higher and higher. Usually, telecentric lenses can be used for high-precision size measurement or detection of products, but the lens barrel of the related telecentric lens is a straight cylinder, i.e. the object plane and the image plane of the lens are parallel, and when a camera or a device or apparatus requiring a camera module is arranged, sufficient space needs to be reserved, which cannot be arranged in a narrow space or a corner space, resulting in limited application scenarios. CONTENT OF THE UTILITY MODEL

[0004] Embodiments of the present application provide a lens barrel, a telecentric lens and a camera module, to solve the problem of high space requirement and limited application scenarios of the telecentric lens in related technologies.

[0005] To achieve the above-mentioned purpose, the embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, the embodiments of the present application provide a lens barrel of a telecentric lens, comprising a first lens barrel, an adapter assembly and a second lens barrel arranged from an object side to an image side, the first lens barrel is used for placing a first lens group, and the second lens barrel is used for placing a second lens group; the adapter assembly has a straight-through connection state and a corner connection state, when the adapter assembly is in the straight-through connection state, the axis of the first lens barrel is parallel to the axis of the second lens barrel, and the distance between the first lens group and the second lens group is a first optical path; when the adapter assembly is in the corner connection state, the axis of the first lens barrel is perpendicular to the axis of the second lens group, and the distance between the first lens group and the second lens group is a second optical path; the second optical path is equal in distance to the first optical path.

[0007] In some embodiments, the adapter assembly comprises an adapter, a first connecting member and a second connecting member; the adapter comprises a first interface, a second interface, a third interface and a fourth interface, the first interface and the second interface are oppositely arranged along a first direction, the third interface and the fourth interface are oppositely arranged along a second direction, the first connecting member is used for covering or opening the second interface or the third interface, and the second connecting member is detachably connected to the fourth interface, the first direction is perpendicular to the second direction; the first interface is connected to the first lens barrel, the second interface is connected to the second lens barrel, the first connecting member covers the third interface, the axis of the second lens barrel coincides with the axis of the second lens barrel and is parallel to the first direction, so that a straight-through channel is formed between the first interface and the second interface; the first interface is connected to the first lens barrel, the third interface is connected to the second lens barrel, the axis of the first lens barrel is parallel to the first direction, and the axis of the second lens barrel is parallel to the second direction; the first connecting member covers the second interface, a perpendicular corner channel is formed between the first interface and the third interface, and the adapter further comprises a mirror arranged in the perpendicular corner channel, the mirror is used for deflecting the optical axis of the first lens group by 90° and making it parallel to the optical axis of the second lens group.

[0008] In some embodiments, the mirror comprises a reflecting surface, an included angle between the reflecting surface and the axis of the second lens group is 45°, and the center of the reflecting surface coincides with the intersection of the axis of the first lens group and the axis of the second lens group.

[0009] In some embodiments, the mirror comprises a mirror body and a mirror seat, the mirror body is an isosceles right triangular prism, the inclined surface of the mirror body is the reflecting surface, the mirror body is arranged in the interior of the mirror seat, and the reflecting surface is exposed to the exterior of the mirror seat; the length direction of the mirror body, the axis of the first lens group and the axis of the second lens group are perpendicular to each other in pairs.

[0010] In some embodiments, the mirror seat is connected to the second connecting member.

[0011] In some embodiments, the mirror seat and the second connecting member are an integral structure.

[0012] In some embodiments, the adapter and the first lens barrel are an integral structure.

[0013] In some embodiments, the adapter and the second lens barrel are an integral structure.

[0014] In some embodiments, the adapter is detachably connected to the first lens barrel, and the adapter is detachably connected to the second lens barrel.

[0015] In some embodiments, the first connecting member is detachably connected with the adapter.

[0016] In some embodiments, the first connecting member is a plate structure.

[0017] The first lens barrel and the second lens barrel are connected through the adapter assembly, and a user can determine whether the adapter assembly is in a straight-through connection state or a corner connection state according to a need, and correspondingly connect the first lens barrel, the second lens barrel and the adapter assembly, so that the whole lens barrel is in a straight barrel state or a corner state. When a placement space of the telecentric lens is sufficient, the connection state of the adapter assembly can be arbitrarily selected. When the placement space of the telecentric lens is relatively small or is located at a corner, the adapter assembly can be selected to be in the corner connection state, and then the first lens barrel, the second lens barrel and the adapter assembly are connected, and the installation of the telecentric lens is completed. Therefore, the requirement of the telecentric lens for the placement space is reduced, and the application range is expanded. Meanwhile, when the adapter assembly is in the straight-through connection state or the corner connection state, the corresponding first optical path distance and second optical path distance between the first lens group placed in the first lens barrel and the second lens group placed in the second lens barrel are the same. Therefore, the imaging resolution, magnification, aberration, chromatic aberration and other optical performances of the telecentric lens remain consistent.

[0018] In a second aspect, the embodiments of the present application provide a telecentric lens, which comprises the lens barrel, the first lens group and the second lens group according to the first aspect. The first lens group is arranged in the interior of the first lens barrel of the lens barrel, and the second lens group is arranged in the interior of the second lens barrel of the lens barrel.

[0019] The lens barrel in the telecentric lens in the embodiments of the present application has the same structure and technical effects as the lens barrel of the telecentric lens in the first aspect, and details are not repeated here.

[0020] In a third aspect, the embodiments of the present application provide a camera module, which comprises a photosensitive element and the telecentric lens according to the first aspect. The photosensitive element is arranged on an image side of the telecentric lens.

[0021] The telecentric lens in the camera module in the embodiments of the present application has the same structure and technical effects as the telecentric lens in the second aspect, and details are not repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a structural schematic diagram of a telecentric lens in a straight barrel connection state according to an embodiment of the present application;

[0023] Figure 2 FIG. 2 is a structural schematic diagram of the telecentric lens in a corner connection state according to an embodiment of the present application;

[0024] Figure 3 is a top view of Figure 1

[0025] Figure 4 is an A-A sectional view of Figure 3

[0026] Figure 5 is a top view of Figure 2

[0027] Figure 6 is a B-B sectional view of Figure 5

[0028] Figure 7 is an enlarged view of I of Figure 4

[0029] Figure 8 is an enlarged view of II of Figure 6

[0030] Figure 9 is a structural schematic diagram of a mirror in some embodiments of the present application.

[0031] In the drawings, various elements are labeled the same as follows:

[0032] 10, first lens barrel;

[0033] 20, second lens barrel;

[0034] 30, adapter assembly; 301, reflecting surface; 31, adapter; 311, first interface; 312, second interface; 313, third interface; 314, fourth interface; 32, first connecting member; 33, second connecting member; 34, mirror; 341, mirror seat; 3411, base; 3412, support seat; 342, mirror body;

[0035] 40, light sensing element;

[0036] First lens group G1; second lens group G2; first lens L1; second lens L2; third lens L3; fourth lens L4; fifth lens L5; sixth lens L6; light splitting prism L7. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0038] ​​​​​​In the embodiments of the present application, the terms "first", "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0039] As shown in Figure 4 , Figure 6 , the present application provides a camera module, which comprises a telecentric lens and a photosensitive element 40, the photosensitive element 40 is located on the image side of the telecentric lens.

[0040] The working principle of the camera module is that the light reflected by the photographed object passes through the telecentric lens to generate an optical image and is projected onto the photosensitive surface of the photosensitive element 40. The photosensitive element 40 converts the optical image into an electrical signal, i.e. an analog image signal, and transmits it to the processor.

[0041] Among them, the photosensitive element 40 (also known as an image sensor) is a kind of semiconductor chip, the surface contains hundreds of thousands to millions of photodiodes, which will produce electric charge when exposed to light. The photosensitive element 40 can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). CCD is made of a high-sensitivity semiconductor material, which can convert light into electric charge. Charge coupled device is composed of many photosensitive units, usually in units of million pixels. When the surface of the photosensitive element 40 is exposed to light, each photosensitive unit will reflect the electric charge on the component, and the signals generated by all photosensitive units together constitute a complete picture.

[0042] Among them, the telecentric lens is an optical lens mainly used in machine vision, precision measurement and detection and other fields. The optical lens mainly uses the refraction principle of lens to image, that is, the light of the object passes through the optical lens to form a clear image on the focal plane, and the image of the object is recorded by the photosensitive element 40 located on the focal plane.

[0043] As shown in Figure 1 , Figure 2 , Figure 4 and Figure 6 , the telecentric lens comprises a lens barrel and a first lens group G1 and a second lens group G2.

[0044] Specifically, as shown in Figure 1 , Figure 2 , Figure 4 and Figure 6 , the first lens group G1 comprises a first lens G11 and a second lens G12.As shown, the lens barrel of the telecentric lens comprises a first lens barrel 10, an adapter assembly 30 and a second lens barrel 20 arranged from the object side to the image side, the first lens barrel 10 is used to place the first lens group G1, and the second lens barrel 20 is used to place the second lens group G2; the adapter assembly 30 has a straight-through connection state and a corner connection state, when the adapter assembly 30 is in the straight-through connection state, the axis of the first lens barrel 10 is parallel to the axis of the second lens barrel 20, that is, the whole lens barrel is in a straight barrel state, the axis of the whole lens barrel is parallel to the axis of the second lens barrel 20, at this time, the distance between the first lens group G1 and the second lens group G2 is the first optical path length (H1) in the formula (1); when the adapter assembly 30 is in the corner connection state, the axis of the first lens barrel 10 is perpendicular to the axis of the second lens group G2, that is, the whole lens barrel is in a corner state, that is, in an L-shaped connection structure, the distance between the first lens group G1 and the second lens group G2 is the second optical path length (H2+H3) in the formula (2); the second optical path length is equal to the distance of the first optical path length. Figure 4 Figure 6 The above-mentioned first optical path length H1 is the distance between the first lens group G1 and the second lens group G2 in the axis direction of the lens barrel.

[0045] The above-mentioned second optical path length includes the distance H2 between the first lens group G1 and the mirror 34 in the optical axis direction of the first lens group G1, and the distance H3 between the mirror 34 and the second lens group G2 in the optical axis direction of the second lens group G2.

[0046] The above-mentioned second optical path length is equal to the distance of the first optical path length, that is, the distance between the first lens group G1 and the second lens group G2 in the optical axis direction is equal when the adapter assembly 30 is in the straight-through connection state and the corner connection state, so that the optical performance parameters such as the total length of the imaging system, the focal length, the field of view of the telecentric lens composed of the first lens group G1 and the second lens group G2 do not change when the adapter assembly 30 is in the straight-through connection state and the corner connection state without changing the structure of the first lens group G1 and the second lens group G2, so that the imaging resolution, magnification, aberration, chromatic aberration and other optical performance of the imaging system remain consistent.

[0047] The above-mentioned first lens group G1 refers to the total of the lenses arranged in the interior of the first lens barrel 10, and the above-mentioned second lens group G2 refers to the total of the lenses arranged in the interior of the second lens barrel 20, the first lens group G1 and the second lens group G2 constitute the imaging system of the telecentric lens, and the following will be described by taking the imaging system comprising the first lens group G1 and the second lens group G2 as an example.

[0048] The above-mentioned first lens group G1 refers to the total of the lenses arranged in the interior of the first lens barrel 10, and the above-mentioned second lens group G2 refers to the total of the lenses arranged in the interior of the second lens barrel 20, the first lens group G1 and the second lens group G2 constitute the imaging system of the telecentric lens, and the following will be described by taking the imaging system comprising the first lens group G1 and the second lens group G2 as an example. Figure 4 Figure 6 ​​As shown, the first lens group G1 includes, in order from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, and a fourth lens L1; and the second lens group G2 includes, in order from the object side to the image side, a fifth lens L5 and a sixth lens L6.

[0049] The embodiment of the present application provides a lens barrel of a telecentric lens. The first lens barrel 10 and the second lens barrel 20 are connected through the adapter assembly 30. A user can determine whether the adapter assembly 30 is in a straight connection state or a corner connection state according to needs, and correspondingly connect the first lens barrel 10, the second lens barrel 20 and the adapter assembly 30, so that the lens barrel as a whole is in a straight barrel state or a corner state. When the placement space of the telecentric lens is sufficient, the connection state of the adapter assembly 30 can be selected at will. When the placement space of the telecentric lens is relatively small or located at a corner, the adapter assembly 30 can be selected to be in a corner connection state, and then the first lens barrel 10, the second lens barrel 20 and the adapter assembly 30 are connected, and the installation of the telecentric lens is completed. Therefore, the limitation requirement of the telecentric lens on the placement space is reduced, and the application range is expanded. Meanwhile, when the adapter assembly 30 is in the straight connection state or the corner connection state, the corresponding first optical path and second optical path distances between the first lens group G1 placed in the first lens barrel 10 and the second lens group G2 placed in the second lens barrel 20 are the same. Therefore, the imaging resolution, magnification, aberration, chromatic aberration and other optical properties of the telecentric lens remain consistent.

[0050] It should be noted that the lens barrel in the present application is taken as an example of the telecentric lens, and of course the lens barrel can also be applied to a periscope lens, which is not limited here.

[0051] As shown in FIG. 1, Figure 4 and Figure 6 As shown in FIG. 1,

[0052] In addition to the adapter assembly 31 being in an integrated structure with the first lens barrel 10, in some embodiments, the adapter assembly 31 can also be in an integrated structure with the second lens barrel 20, or in other embodiments, the adapter assembly 31 is detachably connected with the first lens barrel 10, and the adapter assembly 31 is detachably connected with the second lens barrel 20, that is, the lens barrel as a whole is made in a split type, and meanwhile, the adapter assembly 31, the first lens barrel 10 and the second lens barrel 20 can be detached from each other. In this way, the structure of each part of the lens barrel is simplified, and the processing is facilitated. Meanwhile, when the adapter assembly 31, the first lens barrel 10 and the second lens barrel 20 can be replaced individually, the maintenance cost is reduced.

[0053] It should be noted that the detachable connection described above can be clamping, screwing, etc., which is not specifically limited here.

[0054] As Figure 4 , Figure 6 , Figure 7 and Figure 8 , the adapter assembly 30 includes an adapter 31, a first connecting piece 32 and a second connecting piece 33; the adapter 31 includes a first interface 311, a second interface 312, a third interface 313 and a fourth interface 314, the first interface 311 and the second interface 312 are oppositely arranged along a first direction, the third interface 313 and the fourth interface 314 are oppositely arranged along a second direction, the first connecting piece 32 is used to cover or open the second interface 312 or the third interface 313, the second connecting piece 33 is detachably connected to the fourth interface 314, and the first direction is perpendicular to the second direction; the first interface 311 is connected with the first lens barrel 10, the second interface 312 is connected with the second lens barrel 20, the first connecting piece 32 is covered on the third interface 313, the axis of the second lens barrel 20 coincides with the axis of the second lens barrel 20, and is parallel to the first direction, so that a straight-through channel is formed between the first interface 311 and the second interface 312, at this time, the adapter assembly 30 is in a straight-through connection state, when the first connecting piece 32 covers the third interface 313 and the second connecting piece 33 covers the fourth interface 314, a straight-through light channel is formed inside the lens barrel. The first interface 311 is connected with the first lens barrel 10, the third interface 313 is connected with the second lens barrel 20, the axis of the first lens barrel 10 is parallel to the first direction, and the axis of the second lens barrel 20 is parallel to the second direction; the first connecting piece 32 is covered on the second interface 312, a vertical corner channel is formed between the first interface 311 and the third interface 313, at this time, the adapter assembly 30 is in a corner connection state, when the first connecting piece 32 covers the second interface 312 and the second connecting piece 33 covers the fourth interface 314, an L-shaped sealed light channel is formed inside the lens barrel, the adapter 31 further includes a mirror 34 arranged in the vertical corner channel, the mirror 34 is used to deflect the optical axis of the first lens group G1 by 90° and make it parallel to the optical axis of the second lens group G2.

[0055] The adapter 31 is a cylindrical structure or a similar cylindrical structure, the first direction is the axial direction of the cylindrical structure, and the second direction is the radial direction of the cylindrical structure, that is, the two ports of the cylindrical structure in the axial direction are the first interface 311 and the second interface 312, the third interface 313 and the fourth interface 314 are arranged on the wall of the cylindrical structure, and the axes of the third interface 313 and the fourth interface 314 are parallel to the diameter of the cylindrical structure; or the adapter 31 is a hollow cubic structure or a nearly cubic structure.

[0056] The above settings enable the adapter component 30 to switch between a straight-through connection state and a corner connection state. It has a simple structure, strong practicality, and wide range of applications.

[0057] Since the interface connecting the adapter component 30 to the second lens barrel 20 changes when the adapter component 30 is in different connection states, the structure of the second interface 312 and the third interface 313 is the same to improve the versatility of the adapter component 30. At the same time, the structure of the second interface 312 and the third interface 313 needs to match the structure at the port of the second lens barrel 20.

[0058] It should be noted that the first interface 311, the second interface 312, the third interface 313, and the fourth interface 314 on the adapter 31 are relative. This is only to determine the relative positional relationship. Here, the explanation is based on the example of the adapter 31 and the first lens barrel 10 being an integral structure. When the adapter 31 and the second lens barrel 20 are an integral structure, the interface with the second lens barrel 20 remains unchanged regardless of the different connection states of the adapter assembly 30. However, for ease of understanding, the interface connected to the first lens barrel 10 is still referred to as the first interface 311, and the names of the other interfaces correspond, including the interfaces on the second lens barrel 20.

[0059] The first connector 32 and the adapter 31 are detachably connected. This facilitates the assembly and maintenance of the first connector 32 and the adapter 31.

[0060] Specifically, such as Figure 7 As shown, when the adapter component 30 is in the direct connection state, the first connector 32 is detachably connected to the third interface 313. The first connector 32 realizes the sealing or opening of the third interface 313. When the first connector 32 seals the third interface 313 and the second connector 33 seals the fourth interface 314, a sealed light transmission channel is formed inside the lens barrel.

[0061] The first connector 32 can be a plate-like structure, and it is connected to the third interface 313 by fasteners. This saves materials. Of course, the specific shape and size of the first connector plate need to be determined according to the shape and size of the third interface 313, and are not specifically limited here.

[0062] The second connector 33 described above can be, but is not limited to, a plate-like structure. This not only further saves materials but also facilitates assembly or connection with other components. For example, the second connector 33 can be connected to the reflector 34.

[0063] like Figure 6 , Figure 8 and Figure 9The reflecting mirror 34 includes a reflecting surface 301, and an angle between the reflecting surface 301 and an axis of the second lens group G2 is 45°. A center of the reflecting surface 301 coincides with an intersection of the axis of the first lens group G1 and the axis of the second lens group G2.

[0064] The center of the reflecting surface 301 refers to a geometric center of the reflecting surface 301. The axis of the first lens group G1 intersects with the axis of the second lens group G2, and the intersection is in an L shape.

[0065] As shown in Figure 8 and Figure 9 , the reflecting mirror 34 includes a mirror body 342 and a mirror seat 341. The mirror body 342 is an isosceles right triangular prism, and an inclined surface of the mirror body 342 is the reflecting surface 301. The mirror body 342 is arranged inside the mirror seat 341, and the reflecting surface 301 is exposed outside the mirror seat 341. A length direction of the mirror body 342, the axis of the first lens group G1 and the axis of the second lens group G2 are perpendicular to each other.

[0066] In this way, the reflecting mirror 34 can achieve the purpose of deflecting the optical axis by 90°.

[0067] As shown in Figure 8 and Figure 9 , in some embodiments, the mirror seat 341 is connected with the second connecting piece 33. In this way, the mutual influence of the adapter 31 and the first lens barrel 10 and the second lens barrel 20 is reduced.

[0068] The mirror seat 341 and the second connecting piece 33 can be an integral structure, including integral molding or adhesive connection, of course, the mirror seat 341 and the second connecting piece 33 can also be detachably connected through clamping, screwing and the like, which is not limited here.

[0069] Specifically, as shown in Figure 8 and Figure 9 , the mirror seat 341 and the second connecting piece 33 are an integral structure. In this way, when the reflecting mirror 34 is installed through the fourth interface 314, the mirror seat 341 of the reflecting mirror 34 plays a role of covering the fourth interface 314, so that the process of the adapter assembly 30 is simplified.

[0070] As shown in Figure 9 , the mirror seat 341 includes a base 3411 and a support seat 3412. The mirror body 342 is located inside the support seat 3412, the reflecting surface 301 is exposed outside the support seat 3412, and the base 3411 and the second connecting piece 33 are an integral structure. The base 3411 and the support seat 3412 can be but not limited to an integral structure.

[0071] In order to improve the imaging definition of the telecentric lens, a coaxial light source is connected to the side wall of the second lens barrel 20, and a light splitting prism L7 is arranged in the second lens barrel 20, the optical axis of the coaxial light source is perpendicular to the axis of the second lens barrel 20, and the light emitted by the coaxial light source enters the inside of the second lens barrel 20 through the light splitting prism L7.

[0072] The light splitting prism L7 can be but is not limited to a 45° light splitting prism, mainly serving to split the light emitted by the coaxial light source into two beams through reflection and refraction, and the reflected light and the transmitted light are usually at a 90° angle.

[0073] Through the above arrangement, when the adapter assembly 30 is in the corner connection state, the optical axis of the coaxial light source is parallel to the axis of the first lens barrel, the space utilization is improved, and thus the placement space of the telecentric lens is reduced.

[0074] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A barrel of a telecentric lens, characterized by, The lens barrel comprises a first lens barrel (10), an adapter assembly (30) and a second lens barrel (20) arranged from object side to image side, the first lens barrel (10) is used for placing a first lens group, the second lens barrel (20) is used for placing a second lens group; The adapter assembly (30) has a straight-through connection state and a corner connection state, when the adapter assembly (30) is in the straight-through connection state, the axis of the first lens barrel (10) is parallel to the axis of the second lens barrel (20), the distance between the first lens group and the second lens group is a first optical path, when the adapter assembly (30) is in the corner connection state, the axis of the first lens barrel (10) is perpendicular to the axis of the second lens group, the distance between the first lens group and the second lens group is a second optical path, the second optical path is equal to the first optical path.

2. The lens barrel according to claim 1, wherein The adapter assembly (30) comprises an adapter (31), a first connecting piece (32) and a second connecting piece (33); The adapter (31) comprises a first interface (311), a second interface (312), a third interface (313) and a fourth interface (314), the first interface (311) and the second interface (312) are oppositely arranged along a first direction, the third interface (313) and the fourth interface (314) are oppositely arranged along a second direction, The first connecting piece (32) is used for covering or opening the second interface (312) or covering or opening the third interface (313), the second connecting piece (33) is detachably connected to the fourth interface (314), the first direction is perpendicular to the second direction; The first interface (311) is connected to the first lens barrel (10), the second interface (312) is connected to the second lens barrel (20), the first connecting piece (32) covers the third interface (313), the axis of the second lens barrel (20) coincides with the axis of the second lens barrel (20) and is parallel to the first direction, so that a straight-through channel is formed between the first interface (311) and the second interface (312); The first interface (311) is connected to the first lens barrel (10), the third interface (313) is connected to the second lens barrel (20), the axis of the first lens barrel (10) is parallel to the first direction, the axis of the second lens barrel (20) is parallel to the second direction, the first connecting piece (32) covers the second interface (312), a vertical corner channel is formed between the first interface (311) and the third interface (313), the adapter (31) further comprises a mirror (34) arranged in the vertical corner channel, the mirror (34) is used for deflecting the optical axis of the first lens group by 90° and making it parallel to the optical axis of the second lens group.

3. The lens barrel according to claim 2, wherein The reflecting mirror (34) comprises a reflecting surface (301), an angle between the reflecting surface (301) and an axis of the second lens group is 45°, and a center of the reflecting surface (301) coincides with an intersection of the axis of the first lens group and the axis of the second lens group.

4. The lens barrel according to claim 3, characterized in that, The reflecting mirror (34) comprises a mirror body (342) and a mirror seat (341), the mirror body (342) is an isosceles right triangular prism, an inclined surface of the mirror body (342) is the reflecting surface (301), the mirror body (342) is arranged inside the mirror seat (341), and the reflecting surface (301) is exposed outside the mirror seat (341); a length direction of the mirror body (342), the axis of the first lens group and the axis of the second lens group are perpendicular to each other in pairs.

5. The lens barrel according to claim 4, characterized in that, The mirror seat (341) is connected with the second connecting piece (33).

6. The lens barrel according to claim 5, characterized in that, The mirror seat (341) and the second connecting piece (33) are in an integrated structure.

7. The lens barrel according to any one of claims 2 to 6, characterized in that, The adapter (31) and the first lens barrel (10) are in an integrated structure; Or, the adapter (31) and the second lens barrel (20) are in an integrated structure.

8. The lens barrel according to any one of claims 2 to 6, characterized in that, The adapter (31) is detachably connected with the first lens barrel (10), and the adapter (31) is detachably connected with the second lens barrel (20).

9. The lens barrel according to any one of claims 2 to 6, characterized in that, The first connecting piece (32) is detachably connected with the adapter (31); And / or, the first connecting piece (32) is in a plate structure.

10. A telecentric lens characterized in that, Comprise: The lens barrel according to any one of claims 1 to 9; A first lens group arranged inside a first lens barrel (10) of the lens barrel; A second lens group arranged inside a second lens barrel (20) of the lens barrel.

11. A camera module, comprising: Comprise: The telecentric lens according to claim 10; A photosensitive element (40) arranged on an image side of the telecentric lens.

Images