Lens module and infrared thermal imaging device

Abstract

The utility model discloses a lens module and an infrared thermal imaging device, the lens module comprises a lens barrel assembly and a protective cover assembly, the lens barrel assembly comprises a lens fixing barrel, a focusing barrel movably matched with the lens fixing barrel, and a lens arranged in the focusing barrel; the protective cover assembly comprises a mounting seat arranged on the lens barrel assembly and a protective cover rotationally connected with the mounting seat, the mounting seat comprises a first position selectively connected with the focusing barrel and a second position connected with the lens fixing barrel, the protective cover can rotate relative to the mounting seat to be closed at the first position, and the protective cover can rotate relative to the mounting seat to be closed at the second position. The protective cover is opened relative to the mounting base, and the focusing cylinder is in a separated free focusing state relative to the protective cover assembly. When the lens module needs to be used, the mounting base can be located at the second position, and the protection cover assembly is prevented from being driven to move in the focusing process.

Description

Technical Field

[0001] This utility model relates to the field of optical instrument technology, and in particular to a lens module and an infrared thermal imaging device. Background Technology

[0002] The lens cap primarily serves to protect the lens. Lens caps are usually installed directly on the lens. During product use, the lens cap is opened relative to the lens to expose the lens. When not in use, the lens cap is fastened onto the lens to cover the lens.

[0003] Most existing adjustable lenses are adjusted by rotating the lens to move it along the axis. However, during the adjustment process, the lens cap will also rotate. Changes in the position of the lens cap may affect the device's functions, such as image clarity. Utility Model Content

[0004] In view of this, the present invention provides a lens module and an infrared thermal imaging device to solve the problem of the lens cap rotating with the lens in the prior art.

[0005] On one hand, this application provides a lens module, including:

[0006] The lens barrel assembly includes a lens fixing barrel, a focusing barrel that is movably coupled with the lens fixing barrel, and a lens installed in the focusing barrel;

[0007] The protective cover assembly includes a mounting base disposed on the lens barrel assembly and a protective cover rotatably connected to the mounting base. The mounting base includes a first position selectively connected to the focusing barrel and a second position connected to the lens retaining barrel. In the first position, the protective cover can be rotated and closed relative to the mounting base. In the second position, the protective cover is open relative to the mounting base, and the focusing barrel is in a free focusing state separated from the protective cover assembly.

[0008] In some embodiments, the mounting base is provided with a magnetic attraction structure. In the first position, the mounting base is connected to the focusing cylinder through the magnetic attraction structure, and in the second position, the mounting base is connected to the lens fixing cylinder through the magnetic attraction structure.

[0009] In some embodiments, the mounting base is annular and sleeved around the outer periphery of the lens barrel assembly.

[0010] In some embodiments, the focusing tube has a first flange on its outer periphery, the lens fixing tube has a second flange on its outer periphery, the first flange and the second flange are spaced apart along the optical axis of the lens tube assembly, and the mounting base is located between the first flange and the second flange.

[0011] In some embodiments, the first flange is provided with a first magnetic attraction member, the second flange is provided with a second magnetic attraction member, and the mounting base is provided with a third magnetic attraction member. In the first position, the mounting base is connected to the focusing cylinder through the magnetic attraction of the third magnetic attraction member and the first magnetic attraction member. In the second position, the mounting base is connected to the lens fixing cylinder through the magnetic attraction of the third magnetic attraction member and the second magnetic attraction member.

[0012] In some embodiments, the third magnetic component includes a first magnetic unit and a second magnetic unit. The first magnetic unit is located on the side of the mounting base near the first flange, and the second magnetic unit is located on the side of the mounting base near the second flange. In the first position, the first magnetic unit magnetically engages with the first magnetic component, and in the second position, the second magnetic unit magnetically engages with the second magnetic component.

[0013] In some embodiments, there are multiple first magnetic units and multiple second magnetic units, and the multiple first magnetic units and multiple second magnetic units are arranged alternately along the circumference of the mounting base.

[0014] In some embodiments, the protective cover can rotate at a maximum angle greater than 180° relative to the mounting base, and the protective cover can be suspended at any position.

[0015] In some embodiments, one end of the focusing tube is located inside the lens fixing tube and is threaded into the lens fixing tube; and / or,

[0016] The lens module also includes a detector core located at the end of the lens fixing cylinder away from the focusing cylinder.

[0017] On the other hand, this application provides an infrared thermal imaging device, including the lens module described above.

[0018] The lens module provided by this utility model has the following characteristics: When the mounting base is in the first position, it is connected to the focusing tube, and the protective cover can rotate relative to the mounting base to close, thereby covering the lens and protecting it. When the mounting base is in the second position, it is connected to the lens fixing tube, and the protective cover is opened relative to the mounting base, exposing the lens. At this time, the focusing tube is separated from the protective cover assembly. During the focusing process, the focusing tube will not drive the protective cover assembly to move. Therefore, when the lens module is not needed, the mounting base can be in the first position to protect the lens with the protective cover. When the lens module is needed, the mounting base can be in the second position to separate the focusing tube from the protective cover assembly, thus preventing the protective cover assembly from moving during the focusing process. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a lens module provided in an embodiment of the present invention, in which the mounting base is in the first position;

[0020] Figure 2 for Figure 1 The diagram shows the structure of the lens module when the mounting base is in the second position.

[0021] Figure 3 for Figure 2 A schematic diagram of the structure of the lens barrel assembly shown in the figure;

[0022] Figure 4 for Figure 3 An exploded view of the mounting base and lens fixing cylinder described above;

[0023] Figure 5 for Figure 3 An exploded view of the mounting base and focusing cylinder shown in the diagram;

[0024] Figure 6 for Figure 4 The diagram shows a partial exploded view of the mounting base and the third magnetic component.

[0025] In the diagram: 10, Lens module; 12, Lens barrel assembly; 14, Protective cover assembly; 16, Lens mounting tube; 18, Focusing tube; 20, Lens; 22, Detector mechanism; 24, Mounting base; 26, Protective cover; 28, First flange; 30, Second flange; 32, First magnetic clasp; 34, Second magnetic clasp; 36, Third magnetic clasp; 38, First magnetic unit; 40, Second magnetic unit; 42, First pivot; 44, Second pivot; 46, Rotating shaft; 48, Protrusion. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0027] It should be noted that all directional indicators (such as up, down, left, right, front, back, inside, outside, top, bottom, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship between the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0028] It should also be noted that when a component is referred to as "fixed to" or "set on" another component, the component may be directly on the other component or there may be an intervening component present. When a component is referred to as "connected to" another component, it may be directly connected to the other component or there may be an intervening component present.

[0029] Please see Figure 1 and Figure 2 This utility model provides a lens module 10, applied to an infrared thermal imaging device. The lens module 10 includes a lens barrel assembly 12 and a protective cover assembly 14 installed in the lens barrel assembly 12. The lens barrel assembly 12 includes a lens fixing barrel 16, a focusing barrel 18, and a lens 20. The lens 20 is installed inside the focusing barrel 18. The focusing barrel 18 is movably engaged with the lens fixing barrel 16, allowing the focusing barrel 18 to move relative to the lens fixing barrel 16 along the optical axis O of the lens barrel assembly 12. The protective cover assembly 14 protects the lens 20 when not in use. The lens 20 is fixed relative to the focusing barrel 18. During the movement of the focusing barrel 18 relative to the lens fixing barrel 16, the lens 20 moves relative to the lens fixing barrel 16, causing the position of the lens 20 relative to the lens fixing barrel 16 to change, thereby adjusting the focal length of the lens module 10. The protective cover assembly 14 protects the lens 20 when the lens module 10 is not in use, reducing the risk of damage to the lens 20.

[0030] Optionally, the lens fixing tube 16 and the focusing tube 18 are coaxially arranged, with their central axes collinear, and the optical axis direction O of the lens barrel assembly 12 is also the axis of the lens fixing tube 16 and the focusing tube 18.

[0031] The specific method by which the focusing tube 18 moves relative to the lens fixing tube 16 in the optical axis direction O to achieve focusing is not limited. It can be that the focusing tube 18 and the lens fixing tube 16 form a telescopic engagement in the optical axis direction O, and the focusing tube 18 makes a reciprocating linear motion relative to the lens fixing tube 16 in the optical axis direction O to adjust the distance of the lens 20. Alternatively, the focusing tube 18 and the lens fixing tube 16 can form a threaded engagement, and the focusing tube 18 can generate displacement relative to the lens fixing tube 16 in the optical axis direction O by rotation.

[0032] In this embodiment, one end of the focusing tube 18 is located inside the lens fixing tube 16 and is threadedly engaged with the lens fixing tube 16. That is, the outer surface of the end of the focusing tube 18 inside the lens fixing tube 16 has an external thread, and the inner side of the lens fixing tube 16 has a corresponding internal thread. The external thread of the focusing tube 18 meshes with the internal thread of the lens fixing tube 16, so that the focusing tube 18 and the lens fixing tube 16 form a threaded engagement. When the lens fixing tube 16 cannot rotate, driving the focusing tube 18 to rotate relative to the lens fixing tube 16 can cause the focusing tube 18 to be displaced relative to the lens fixing tube 16 in the optical axis direction O, thereby achieving the focusing effect. The focusing tube 18 and the lens fixing tube 16 achieve the focusing effect through threaded engagement. The thread structure is simple, and there are fewer structural components between the focusing tube 18 and the lens fixing tube 16, which helps to reduce the overall size of the lens module 10 and the production cost.

[0033] In one embodiment, the lens module 10 further includes a detector core 22, which is mounted on the end of the lens fixing tube 16 away from the focusing tube 18. The detector core 22 and the lens 20 are arranged at intervals relative to each other. When the focusing tube 18 moves relative to the lens fixing tube 16, it drives the lens 20 to move relative to the detector core 22, so as to adjust the distance between the lens 20 and the detector core 22, thereby achieving the effect of adjusting the focal length.

[0034] Please refer to it again. Figure 1 and Figure 2 In one embodiment, the protective cover assembly 14 includes a mounting base 24 and a protective cover 26. The mounting base 24 is mounted on the lens barrel assembly 12, and the protective cover 26 is rotatably connected to the mounting base 24 so that the protective cover 26 can rotate relative to the mounting base 24 and the lens barrel assembly 12. When the lens module 10 is not needed, the protective cover 26 can be rotated to cover the lens 20, thereby protecting the lens 20. When the lens module 10 is needed, the protective cover 26 can be rotated in the opposite direction to expose the lens 20.

[0035] Mounting base 24 can be selectively connected to focusing tube 18 or lens mounting tube 16. Mounting base 24 includes a first position and a second position. In the first position, mounting base 24 is connected to focusing tube 18, and protective cover 26 can rotate relative to mounting base 24 to close. In the closed state, protective cover 26 is located on one axial side of focusing tube 18 and covers lens 20. In the second position, mounting base 24 is connected to lens mounting tube 16, and protective cover 26 is open relative to mounting base 24. In the open state, protective cover 26 is moved away from one axial side of focusing tube 18 and exposes lens 20. Focusing tube 18 is in a free focusing state separated from protective cover assembly 14, that is, focusing tube 18 is separated from protective cover 26 and mounting base 24, so that the movement of focusing tube 18 relative to lens mounting tube 16 to adjust focus is not affected by protective cover 26 and mounting base 24. When the lens module 10 is not needed, the mounting base 24 can be in the first position, and then the protective cover 26 can be rotated to cover the lens 20, thus protecting the lens 20. When the lens module 10 is needed, the mounting base 24 can be switched from the first position to the second position, thereby separating the focusing tube 18 from the protective cover 26 and the mounting base 24, so as to avoid the focusing tube 18 driving the protective cover assembly 14 to move during the focusing process and affecting the function of the infrared thermal imaging device.

[0036] Mounting base 24 can be optionally detachably connected to lens mounting tube 16 or focusing tube 18. Specifically, when mounting base 24 is in the first position, it is detachably connected to focusing tube 18; when mounting base 24 is in the second position, it is detachably connected to lens mounting tube 16. In an optional example, mounting base 24 has a magnetic attraction structure. In the first position, mounting base 24 magnetically engages with focusing tube 18 via this structure, thus creating a detachable connection. In the second position, mounting base 24 magnetically engages with lens mounting tube 16 via the same structure, also creating a detachable connection. The magnetic detachable connection of mounting base 24 to lens mounting tube 16 or focusing tube 18 simplifies connection and separation, allowing for easy switching between the first and second positions.

[0037] In one embodiment, the mounting base 24 is annular and sleeved on the outer periphery of the lens barrel assembly 12. When the mounting base 24 is neither in the first position nor in the second position, the mounting base 24 can move linearly relative to the lens barrel assembly 12 along the optical axis direction O, and drive the protective cover 26 to move together. This allows the mounting base 24 to switch between the first position and the second position in a sliding manner relative to the lens barrel assembly 12. Moreover, sleeved on the outer periphery of the lens barrel assembly 12, the mounting base 24 can be radially limited, preventing the mounting base 24 from separating radially from the lens barrel assembly 12 during movement.

[0038] Optionally, when the mounting base 24 is neither in the first position nor in the second position, in addition to moving linearly relative to the lens barrel assembly 12 along the optical axis direction O, the mounting base 24 can also rotate relative to the lens barrel assembly 12 and drive the protective cover 26 to rotate so as to adjust the position of the protective cover 26.

[0039] Please see Figure 2 and Figure 3 The focusing tube 18 has a first flange 28 on its outer periphery, which is annular and surrounds the outer periphery of the focusing tube 18. The lens mounting tube 16 has a second flange 30 on its outer periphery, which is also annular and surrounds the outer periphery of the lens mounting tube 16. The first flange 28 and the second flange 30 are spaced apart along the optical axis direction O, and the mounting base 24 is located between the first flange 28 and the second flange 30. The outer diameters of the first flange 28 and the second flange 30 are both larger than the inner diameter of the mounting base 24. The first flange 28 and the second flange 30 can limit the mounting base 24 in the optical axis direction O, preventing the mounting base 24 from separating from the lens tube assembly 12 along the optical axis direction O during movement relative to the lens tube assembly 12.

[0040] When the mounting base 24 is in the first position, it is attached to and relatively fixed with the first flange 28. When the mounting base 24 is in the second position, it is attached to and relatively fixed with the second flange 30. When the mounting base 24 moves to the first position, it can be determined whether the mounting base 24 has moved to the correct position by observing whether it is attached to the first flange 28. Similarly, when the mounting base 24 moves to the second position, it can be determined whether it has moved to the correct position by observing whether it is attached to the second flange 30.

[0041] Optionally, the focusing tube 18 is integrally formed with the first flange 28, and the lens fixing tube 16 is integrally formed with the second flange 30, which ensures the connection strength between the focusing tube 18 and the first flange 28 and the lens fixing tube 16 and the second flange 30, while eliminating the assembly process.

[0042] Please see Figure 4 and Figure 5 In one embodiment, the first flange 28 is provided with a first magnetic 32, the second flange 30 is provided with a second magnetic 34, and the mounting base 24 is provided with a third magnetic 36. The third magnetic 36 can selectively magnetically engage with either the first magnetic 32 or the second magnetic 34 to connect the mounting base 24 to the focusing tube 18 or the lens fixing tube 16. That is, in the first position, the third magnetic 36 and the first magnetic 32 magnetically engage to connect the mounting base 24 to the focusing tube 18; in the second position, the third magnetic 36 and the second magnetic 34 magnetically engage to connect the mounting base 24 to the lens fixing tube 16, so as to prevent the mounting base 24 from automatically moving linearly or rotating relative to the lens barrel assembly 12 along the optical axis direction O when it is in the first or second position.

[0043] The attraction force between the magnetic components is inversely proportional to the distance. As the mounting base 24 moves toward the first flange 28, the distance between the third magnetic component 36 and the first magnetic component 32 gradually decreases, and the attraction force gradually increases. When the mounting base 24 moves close enough to the first flange 28, it automatically fits and is fixed together with the first flange 28 under the action of the third magnetic component 36 and the first magnetic component 32, thus fixing the mounting base 24 in the first position. Similarly, when the mounting base 24 moves close enough to the second flange 30, it automatically fits and is fixed together with the second flange 30 under the action of the third magnetic component 36 and the second magnetic component 34, thus fixing the mounting base 24 in the second position for user convenience.

[0044] Optionally, there are multiple first magnetic attractors 32, second magnetic attractors 34, and third magnetic attractors 36. Multiple first magnetic attractors 32 are arranged at intervals along the circumference of the first flange 28, multiple second magnetic attractors 34 are arranged at intervals along the circumference of the second flange 30, and multiple third magnetic attractors 36 are arranged at intervals along the circumference of the mounting base 24. Since the volume of a magnetic attractor is proportional to its attractive force, by setting multiple spaced magnetic attractors, compared to setting a relatively large annular magnetic attractor, the problem of separation difficulties due to excessive attractive force can be avoided.

[0045] Please see Figure 6 In one embodiment, the third magnetic attractor 36 includes a first magnetic attractor unit 38 and a second magnetic attractor unit 40 respectively disposed on opposite sides of the mounting base 24. The first magnetic attractor unit 38 is located on the side of the mounting base 24 near the first flange 28, and the second magnetic attractor unit 34 is located on the side of the mounting base 24 near the second flange 30. In the first position, the first magnetic attractor unit 38 magnetically engages with the first magnetic attractor unit 32, and in the second position, the second magnetic attractor unit 40 magnetically engages with the second magnetic attractor unit 34. By configuring the third magnetic attractor 36 to include the first magnetic attractor unit 38 and the second magnetic attractor unit 40, with the first magnetic attractor unit 38 used for magnetic engagement with the first magnetic attractor unit 32 and the second magnetic attractor unit 40 used for magnetic engagement with the second magnetic attractor unit 34, the volume design of the first magnetic attractor unit 38 and the second magnetic attractor unit 40 is more flexible, so that the required magnetic attraction strength can be obtained by controlling the volume of the first magnetic attractor unit 38 and the second magnetic attractor unit 40.

[0046] In an optional example, a plurality of first magnetic units 38 and a plurality of second magnetic units 40 are evenly spaced along the circumferential interval of the mounting base 24. The number of first magnetic units 32 is the same as the number of first magnetic units 38 and they are evenly spaced along the circumferential interval of the first flange 28. The number of second magnetic units 34 is the same as the number of second magnetic units 40 and they are evenly spaced along the circumferential interval of the second flange 30. The distance between any two adjacent first magnetic units 38 is the same as the distance between any two adjacent first magnetic units 32, and the distance between any two adjacent second magnetic units 40 is the same as the distance between any two adjacent second magnetic units 34, so that each first magnetic unit 32 can be magnetically engaged with a corresponding first magnetic unit 38, and each second magnetic unit 34 can be magnetically engaged with a corresponding second magnetic unit 40.

[0047] There are multiple first magnetic units 38 and multiple second magnetic units 40. These multiple first magnetic units 38 and multiple second magnetic units 40 are arranged alternately along the circumference of the mounting base 24, with adjacent first magnetic units 38 and second magnetic units 40 spaced a certain distance apart in the circumference of the mounting base 24. The first magnetic units 38 and second magnetic units 40 form a misalignment effect in the optical axis direction O, ensuring that the axial length of the first magnetic unit 38 is not affected by the second magnetic unit 40, and the axial length of the second magnetic unit 40 is not affected by the first magnetic unit 32. This allows for more flexible volume design of the first magnetic units 38 and second magnetic units 40. In an optional example, there are eight first magnetic units 38 and eight second magnetic units 40, which are evenly and alternately arranged along the circumference of the mounting base 24.

[0048] Mounting holes are provided on opposite sides of the first flange 28, the second flange 30, and the mounting base 24. The first magnetic component 32 is mounted to the mounting hole on the first flange 28, the second magnetic component 34 is mounted to the mounting hole on the second flange 30, the first magnetic unit 38 is mounted to the mounting hole on the side of the mounting base 24 near the first flange 28, and the second magnetic unit 40 is mounted to the mounting hole on the side of the mounting base 24 near the second flange 30, thereby improving the compactness of the overall structure and reducing the obtrusiveness of the magnetic components.

[0049] Please see Figure 1 and Figure 2 In one embodiment, the mounting base 24 is provided with a first pivot portion 42 on its circumferential outer side, and the first pivot portion 42 is provided with a pivot groove. The protective cover 26 is provided with a corresponding second pivot portion 44. The second pivot portion 44 is located in the pivot groove and is rotatably connected to the first pivot portion 42 through a rotating shaft 46, so that the protective cover 26 can rotate relative to the mounting base 24 around the rotating shaft 46.

[0050] The protective cover 26 can rotate at a maximum angle greater than 180° relative to the mounting base 24. When the mounting base 24 is in the first position, the protective cover 26 can be rotated to close it. At this time, the protective cover 26 is located on one side of the axial direction of the focusing tube 18 and covers the lens 20. The protective cover 26 and the mounting base 24 are parallel or nearly parallel to each other. When the lens module 10 needs to be used, the protective cover 26 can be rotated so that its rotation angle around the pivot 46 exceeds 180°, and then the mounting base 24 is driven to move from the first position to the second position, so that the protective cover assembly 14 is separated from the focusing tube 18, thus preventing the protective cover assembly 14 from affecting the movement of the focusing tube 18 relative to the lens fixing tube 16. Optionally, when the lens module 10 needs to be used, the closed protective cover 26 can be rotated 270°, and then the mounting base 24 can be moved to the second position. At this time, the protective cover 26 extends from the mounting base 24 in a direction away from the focusing tube 18.

[0051] The protective cover 26 can be suspended at any position. That is, within the range of rotation angles of the protective cover 26 relative to the mounting base 24, the protective cover 26 can remain relatively fixed to the mounting base 24 after rotating at any angle. This positions the protective cover 26 in the rotated position, enhances the stability of the protective cover 26 after rotation, and reduces the risk of the protective cover 26 rotating relative to the mounting base 24 under external forces such as impact and vibration during use. Moreover, it does not require the protective cover 26 to be rotated at a specific angle to achieve suspension, making it convenient to use.

[0052] Optionally, when the rotating shaft 46 is fixed relative to the first pivot 42 and rotatably engaged with the second pivot 44, a damping layer can be provided between the rotating shaft 46 and the second pivot 44 to increase the friction between the rotating shaft 46 and the second pivot 44, thereby increasing the external force required for the protective cover 26 to rotate relative to the mounting base 24, and thus achieving the effect of the protective cover 26 being suspended; when the rotating shaft 46 is fixed relative to the second pivot 44 and rotatably engaged with the first pivot 42, a damping layer can be provided between the rotating shaft 46 and the first pivot 42 to increase the friction between the rotating shaft 46 and the first pivot 42, thereby increasing the external force required for the protective cover 26 to rotate relative to the mounting base 24, and thus achieving the effect of the protective cover 26 being suspended.

[0053] A protrusion 48 is provided on one side of the protective cover 26. When the mounting base 24 is in the first position and the protective cover 26 is rotated and closed relative to the mounting base 24, the protective cover 26 and the axial side of the focusing cylinder 18 are in contact. The protrusion 48 is inserted into the focusing cylinder 18 to limit the movement and prevent the protective cover 26 from opening automatically and affecting the protective effect. Optionally, the protrusion 48 can be made of soft rubber to give it a certain degree of elasticity and allow it to deform, making it easy for the protrusion 48 to be inserted into or removed from the focusing cylinder 18.

[0054] This utility model also provides an infrared thermal imaging device, which includes a lens module 10. The specific structure of the lens module 10 can be referred to the above embodiments. Since the infrared thermal imaging device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0055] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A lens module, characterized in that, include: The lens barrel assembly (12) includes a lens fixing barrel (16), a focusing barrel (18) that is movably engaged with the lens fixing barrel (16), and a lens (20) installed in the focusing barrel (18); The protective cover assembly (14) includes a mounting base (24) mounted on the lens barrel assembly (12) and a protective cover (26) rotatably connected to the mounting base (24). The mounting base (24) includes a first position selectively connected to the focusing barrel (18) and a second position connected to the lens retaining barrel (16). In the first position, the protective cover (26) can be rotated and closed relative to the mounting base (24). In the second position, the protective cover (26) is open relative to the mounting base (24), and the focusing barrel (18) is in a free focusing state separated from the protective cover assembly (14).

2. The lens module according to claim 1, characterized in that, The mounting base (24) is provided with a magnetic attraction structure. In the first position, the mounting base (24) is connected to the focusing tube (18) through the magnetic attraction structure. In the second position, the mounting base (24) is connected to the lens fixing tube (16) through the magnetic attraction structure.

3. The lens module according to claim 1, characterized in that, The mounting base (24) is annular and is fitted around the outer periphery of the lens barrel assembly (12).

4. The lens module according to claim 3, characterized in that, The focusing tube (18) has a first flange (28) on its outer periphery, and the lens fixing tube (16) has a second flange (30) on its outer periphery. The first flange (28) and the second flange (30) are spaced apart along the optical axis of the lens tube assembly (12), and the mounting base (24) is located between the first flange (28) and the second flange (30).

5. The lens module according to claim 4, characterized in that, The first flange (28) is provided with a first magnetic suction member (32), the second flange (30) is provided with a second magnetic suction member (34), and the mounting base (24) is provided with a third magnetic suction member (36). In the first position, the mounting base (24) is connected to the focusing tube (18) through the magnetic attraction of the third magnetic suction member (36) and the first magnetic suction member (32). In the second position, the mounting base (24) is connected to the lens fixing tube (16) through the magnetic attraction of the third magnetic suction member (36) and the second magnetic suction member (34).

6. The lens module according to claim 5, characterized in that, The third magnetic attractor (36) includes a first magnetic attractor unit (38) and a second magnetic attractor unit (40). The first magnetic attractor unit (38) is located on the side of the mounting base (24) near the first flange (28), and the second magnetic attractor unit (40) is located on the side of the mounting base (24) near the second flange (30). In the first position, the first magnetic attractor unit (38) is magnetically attracted to the first magnetic attractor (32), and in the second position, the second magnetic attractor unit (40) is magnetically attracted to the second magnetic attractor (34).

7. The lens module according to claim 6, characterized in that, There are multiple first magnetic units (38) and multiple second magnetic units (40), and multiple first magnetic units (38) and multiple second magnetic units (40) are arranged alternately along the circumference of the mounting base (24).

8. The lens module according to any one of claims 1-7, characterized in that, The maximum angle at which the protective cover (26) can rotate relative to the mounting base (24) is greater than 180°, and the protective cover (26) can be suspended at any position.

9. The lens module according to any one of claims 1-7, characterized in that, One end of the focusing tube (18) is located inside the lens fixing tube (16) and is threaded into the lens fixing tube (16); and / or, The lens module also includes a detector core (22) located at the end of the lens fixing tube (16) away from the focusing tube (18).

10. An infrared thermal imaging device, characterized in that, Includes the lens module as described in any one of claims 1-9.

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