A multi-gear mechanical switching thermal imager magnification eyepiece

Abstract

The application discloses a multi-gear mechanical switching magnification eyepiece of a thermal imager, and relates to the technical field of magnification eyepieces. When an outer ring cylinder is manually rotated, the outer ring cylinder is smoothly rotated on a lens machine body, and a mounting frame is linked with a rotating plate to drive a closed plate to rotate around a fixed end of a positioning rod. A plurality of closed plates distributed at equal angles are synchronously rotated to be attached to the inner wall of the outer ring cylinder, so that a camera channel is completely exposed, and a thermal imaging camera work is started. In the process, an inclined guide slide forces a driving conductive rod to slide and approach a lens glass sheet, compresses a conductive spring to push a conductive soft plate to be closely attached to the surface of the lens glass sheet. The design forms a charge release path, and static electricity on the lens glass sheet is conducted to the outer ring cylinder through the conductive soft plate, the conductive spring, the conductive hard plate and the driving conductive rod, and is finally released through a user's finger and human body grounding, so that the accumulation of static electricity is effectively avoided, and dust pollution of the glass surface caused by static adsorption is fundamentally prevented.

Description

Technical Field

[0001] This invention relates to the field of magnification eyepiece technology, specifically to a multi-level mechanically switchable magnification eyepiece for thermal imaging. Background Technology

[0002] Multi-level mechanically switchable magnification eyepieces for thermal imagers refer to optical zoom systems on equipment that enable rapid switching of magnification levels via physical switches (such as dials). The core of this design lies in mechanical selection rather than digital zoom or software adjustment. Key features of this design include: the magnification is switched to preset levels via a mechanical structure, making operation direct and reliable, balancing wide-angle field of view and high magnification, stable optical performance during switching, and images that are less prone to blurring or distortion. Users can quickly select the magnification level to adapt to scenarios such as target search or precise aiming, improving response speed and emphasizing operational efficiency and environmental adaptability.

[0003] Multi-position mechanically switchable magnification eyepieces for thermal imagers have a protective cover over the lens when not in use. This protects the eyepiece during storage and transport, preventing scratches or breakage of the lens glass. While the protective cover provides protection, the lens glass is mostly made of glass. Dry environments easily cause static electricity to build up, and low humidity makes it difficult for this static to dissipate. Furthermore, the plastic protective cover in contact with the lens glass can also generate static electricity. Therefore, in some environments, the lens glass is prone to static electricity. When used in dusty environments (such as outdoors, construction sites, factories, etc.), removing the protective cover allows the lens glass to easily attract dust from the air due to static electricity. How to solve the problem of image quality being affected by dust accumulation on the lens glass over time remains a challenge. 1. Users can wipe the lens with a cleaning cloth regularly. Although this can effectively clean the lens, the dust will rub against the lens glass surface during the wiping process. Frequent wiping can easily scratch the lens glass and reduce its lifespan. 2. Using an air blower to blow air onto the lens protective film removes dust through the impact of the airflow. This device can solve the problem of dust adhering to the lens glass. However, in actual use, the air blower needs to be carried around and requires the user to operate it, which is time-consuming, laborious, and inconvenient.

[0004] In general, existing methods essentially involve removing dust from the lens glass after it has adhered to it. This process of removing dust from the lens glass is not only prone to damaging the lens glass, but also requires additional manual operation, which is quite troublesome.

[0005] To address this issue, the present invention proposes a multi-level mechanically switching magnification eyepiece for thermal imaging cameras that can fundamentally solve the problem of dust adhering to the lens glass. Summary of the Invention

[0006] The present invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different solution. Specifically, the present invention aims to provide a multi-level mechanically switchable magnification eyepiece for thermal imaging, thereby solving the problem mentioned in the background that the lens glass easily attracts dust from the air due to static electricity, which over time affects the imaging effect.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a multi-level mechanically switchable magnification eyepiece for a thermal imager, comprising a lens body and a lens glass plate disposed on the lens body, and further comprising: The inner and outer rings are located at one end of the lens body; A sealing component located inside the outer ring barrel to protect the lens glass; An electrostatic dissipation component that achieves charge neutralization through contact conduction, located inside the inner ring cylinder; The enclosing component includes enclosing plates that are equally angled and distributed inside the outer ring cylinder, which open and close adaptively based on the rotation direction of the outer ring cylinder; The sealing component also includes rotating plates that are equally angled inside the outer ring cylinder for driving the opening and closing of the sealing plate; The electrostatic dissipation component includes a conductive spring disposed inside the inner cylinder for conducting charge. The electrostatic dissipation component also includes a conductive flexible plate for conducting charge in contact with the lens glass and a conductive rigid plate for driving the conductive flexible plate to adhere to the lens glass.

[0008] Preferably, the inner ring tube is fixedly connected to the lens body; The outer ring tube is rotatably connected to the lens body; The outer ring is fitted over the inner ring.

[0009] Preferably, a movable snap-fit ​​assembly is provided between the inner ring cylinder and the outer ring cylinder; The movable snap-fit ​​assembly includes slots evenly formed on the outer wall of the inner ring cylinder and grooves evenly formed on the inner wall of the outer ring cylinder. The inner wall of the groove is equipped with a ball spring plate; The retaining ball spring plate is engaged with the retaining slot.

[0010] Preferably, one end of the rotating plate is rotatably connected to a mounting bracket; The mounting bracket is fixed to the inner wall of the outer ring cylinder; The other end of the rotating plate is provided with a rotating shaft, and the rotating shaft is fixed to one side of the closed plate; The bottom of the sealing plate is rotatably connected to a positioning rod, and one end of the positioning rod is fixedly connected to the inner ring cylinder.

[0011] Preferably, the sealing plates are arranged at equal angular intervals and in an alternating vertical layout.

[0012] Preferably, one side of the conductive flexible plate is fixedly connected to one end of the conductive spring; One side of the conductive rigid plate is fixedly connected to the other end of the conductive spring.

[0013] Preferably, both the conductive flexible plate and the conductive rigid plate are circular ring structures.

[0014] Preferably, a driving conductive rod is fixedly connected to the outer wall of the conductive rigid plate at equal angles; The inner wall of the outer ring cylinder is provided with guide slides at equal angles; The inner wall of the inner ring cylinder is provided with guide channels at equal angles; The driving conductive rod is slidably sleeved with the guide channel; The drive conductive rod is slidably connected to the guide channel.

[0015] Preferably, the guide rail is inclined; The shape of the guide channel is the same as the shape of the guide slide.

[0016] Preferably, a conductive spring sheet is fixedly connected to the inner wall of the conductive spring; One end of the conductive spring is fixedly connected to the conductive flexible plate.

[0017] Compared with the prior art, the beneficial effects of the present invention are: When the outer ring is manually rotated, it rotates smoothly on the lens body. Through the linkage of the mounting bracket and rotating plate, the sealing plate rotates around the fixed end of the positioning rod. Multiple equally angled sealing plates rotate synchronously until they are in contact with the inner wall of the outer ring, fully exposing the camera channel and initiating thermal imaging. During this process, the inclined guide slide forces the drive conductive rod to slide and approach the lens glass, compressing the conductive spring to push the conductive flexible plate tightly against the surface of the glass, forming a charge release path. Static electricity on the lens glass is conducted to the outer ring through the conductive flexible plate, conductive spring, conductive rigid plate, and drive conductive rod, and finally released through the user's fingers and body grounding, effectively preventing static electricity accumulation. This structure, through the synergistic effect of the sealing components and static dissipation components, not only achieves intelligent opening and closing of the camera channel but also significantly reduces the accumulation of static electricity on the lens glass, fundamentally preventing dust from contaminating the glass surface due to static electricity adsorption, and avoiding image blurring and quality degradation caused by dust.

[0018] When the outer ring cylinder is manually rotated, its linkage design with the lens body ensures smooth rotation. The outer ring cylinder drives the sealing plate to rotate through the rotating plate. Multiple sealing plates distributed at equal angles rotate synchronously until they fit against the inner wall of the outer ring cylinder, completely exposing the camera channel and activating the thermal imaging camera function. After the camera operation is completed, the outer ring cylinder is rotated in the opposite direction, and the multiple sealing plates are closed again through the same principle. This structure achieves intelligent opening and closing of the camera channel through mechanical linkage. Compared with existing technologies, it eliminates the need for frequent disassembly and replacement of the dust cover, avoids the loss of the dust cover, and optimizes the equipment operation process. Attached Figure Description

[0019] Figure 1 This is a first-view structural diagram of the present invention.

[0020] Figure 2 This is a schematic diagram of the second perspective structure of the present invention.

[0021] Figure 3 This is a schematic diagram of the third-view structure of the present invention.

[0022] Figure 4 This is a side view of the present invention.

[0023] Figure 5 This is a schematic diagram showing the closed state of the sealing component in this invention.

[0024] Figure 6 This is a schematic diagram showing the state of the closed component when it is open or closed in this invention.

[0025] Figure 7 This is a first-view exploded view of the present invention.

[0026] Figure 8 This is a second-view exploded view of the present invention.

[0027] Figure 9 This is a cross-sectional view of the present invention.

[0028] Figure 10 This is a comparison image showing the conductive flexible plate of the present invention in contact with the lens glass.

[0029] Figure 11 This is a schematic diagram of the conductive spring in this invention.

[0030] In the diagram: 1. Lens body; 2. Inner ring barrel; 3. Outer ring barrel; 4. Mounting bracket; 41. Rotating plate; 42. Sealing plate; 43. Positioning rod; 5. Conductive rigid plate; 51. Drive conductive rod; 52. Conductive flexible plate; 53. Conductive spring; 54. Conductive spring; 6. Lens glass plate. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figures 1 to 11 The present invention provides a technical solution: a multi-level mechanically switchable magnification eyepiece for a thermal imager, comprising a lens body 1 and a lens glass 6 disposed on the lens body 1, and further comprising: The inner ring tube 2 and the outer ring tube 3 are located at one end of the lens body 1; A sealing component located inside the outer ring tube 3 to protect the lens glass plate 6; An electrostatic dissipation component that achieves charge neutralization through contact conduction, located inside the inner ring cylinder 2; The sealing component includes sealing plates 42 that are equidistantly distributed inside the outer ring cylinder 3 and open and close adaptively based on the rotation direction of the outer ring cylinder 3; The sealing component also includes a rotating plate 41 that is equidistantly distributed inside the outer ring cylinder 3 for driving the sealing plate 42 to open and close; The electrostatic dissipation component includes a conductive spring 53 disposed inside the inner cylinder 2 for conducting charge; The electrostatic dissipation assembly also includes a conductive flexible plate 52 for conducting charge in contact with the lens glass plate 6 and a conductive rigid plate 5 for driving the conductive flexible plate 52 to adhere to the lens glass plate 6.

[0033] In specific implementation, there are multiple sealing plates 42. Multiple sealing plates 42 can cover the camera channel of the outer ring cylinder 3. The sealing plates 42 can protect the lens glass plate 6 and prevent the lens glass plate 6 from being exposed when not in use. When using the device, the outer ring cylinder 3 is rotated, and the sealing plates 42 rotate towards the inner wall of the outer ring cylinder 3 to expose the camera channel. When the user rotates the outer ring cylinder 3, the conductive flexible plate 52 simultaneously contacts the lens glass plate 6. The charge on the lens glass plate 6 is transferred to the user's hand through the outer ring cylinder 3 and grounded through the human body (such as by contacting the ground), forming a charge release path, thereby preventing the lens glass plate 6 from attracting dust due to static electricity.

[0034] The inner ring tube 2 is fixedly connected to the lens body 1; The outer ring tube 3 is rotatably connected to the lens body 1; The outer ring cylinder 3 is fitted outside the inner ring cylinder 2.

[0035] In practice, the user can manually rotate the outer ring barrel 3, which can rotate on the lens body 1. The outer wall of the outer ring barrel 3 is provided with anti-slip grooves, which optimizes the operating feel. When the outer ring barrel 3 is charged, since the material of the outer ring barrel 3 is conductive, such as metal or specially treated plastic, it can play a role in conducting electricity. Therefore, when the user manually rotates the outer ring barrel 3, the charge will be quickly conducted to the user's finger, and then grounded through the human body (such as by touching the ground), forming a charge release path.

[0036] A movable snap-fit ​​assembly is provided between the inner ring cylinder 2 and the outer ring cylinder 3; The movable snap-fit ​​assembly includes slots evenly formed on the outer wall of the inner ring cylinder 2 and grooves evenly formed on the inner wall of the outer ring cylinder 3; The inner wall of the groove is equipped with a ball spring plate; The retaining ball spring plate is engaged with the retaining slot.

[0037] In practice, slots are evenly arranged in a ring on the outer wall of the inner cylinder 2, and grooves are evenly arranged in a ring on the inner wall of the outer cylinder 3. The ball spring plates inside the grooves are movably engaged with the slots. The ball spring plates consist of a metal spring plate with a ball groove and a ball rolling inside the groove. The ball is engaged in the groove, and its surface is smooth and can roll. When the outer cylinder 3 is rotated, the ball is resisted by the inner wall of the groove, compressing the metal spring plate and retracting into the groove, thus rotating the outer cylinder 3. When the user does not rotate the outer cylinder 3, the ball is engaged by the metal spring plate. Inside the corresponding slot, the retaining bead is limited by the metal spring and will not automatically retract. Therefore, the outer ring cylinder 3 will not rotate automatically without external rotation. It should be noted that the slot, groove, and retaining bead spring are all existing and mature movable locking components, so they are not shown in the attached figure. This movable locking component can be referenced from the telescopic retaining bead and slot on the telescopic rod of a folding umbrella. It should also be noted that this movable locking component is used on the eyepiece, so the workmanship is relatively fine and there will be no jamming during use. Other movable locking components that can achieve the same effect can also be used in this device.

[0038] Please see Figures 1 to 11 One end of the rotating plate 41 is rotatably connected to the mounting bracket 4; Mounting bracket 4 is fixed to the inner wall of outer ring cylinder 3; The other end of the rotating plate 41 is provided with a rotating shaft, and the rotating shaft is fixed to one side of the closed plate 42; A positioning rod 43 is rotatably connected to the bottom of the closed plate 42, and one end of the positioning rod 43 is fixedly connected to the inner ring cylinder 2.

[0039] The closed panels 42 are arranged at equal angles and in an alternating vertical layout.

[0040] In practice, when the outer ring cylinder 3 is rotated, the rotating plate 41 is pulled by the mounting bracket 4. The rotating plate 41 then pulls one side of the sealing plate 42. One end of the sealing plate 42 is limited by the positioning rod 43 and cannot move, only rotate. Therefore, the rotating plate 41 drives the sealing plate 42 to rotate. The sealing plate 42 rotates towards the inner wall of the outer ring cylinder 3. The equally angled sealing plates 42 rotate synchronously to the inner wall of the outer ring cylinder 3, at which point the camera channel is exposed. It should be noted that the range of the camera channel of this eyepiece is exactly the size of the channel of the outer ring cylinder 3. The useful imaging range of the lens glass plate 6 is the same as the channel size of the outer ring tube 3. The outer ring range of the lens glass plate 6 is not within the range required for imaging. Therefore, the position of the sealing plate 42 after rotation and the conductive spring 53 and other structures will not affect normal imaging. Multiple sealing plates 42 are arranged in an alternating vertical layout. The sealing plates 42 will not be stuck when rotating. It should be noted that the sealing plates 42 are relatively thin, so the two sealing plates 42 located on the outermost side are not far apart. Moreover, the sealing plates 42 are made of a high-hardness material, which can protect the lens glass plate 6.

[0041] One side of the conductive flexible board 52 is fixedly connected to one end of the conductive spring 53; One side of the conductive rigid plate 5 is fixedly connected to the other end of the conductive spring 53.

[0042] In practice, when the conductive spring 53 is subjected to force, it will cause the conductive flexible plate 52 to contact the lens glass plate 6. When the conductive spring 53 is subjected to force, it will be compressed, and its coils will tightly adhere the conductive flexible plate 52 to the lens glass plate 6. The conductive flexible plate 52, conductive spring 53, conductive rigid plate 5 and other structures are all made of conductive materials. Therefore, the charge on the lens glass plate 6 will be transferred to the conductive rigid plate 5 through the conductive flexible plate 52 and conductive spring 53.

[0043] Both the conductive flexible board 52 and the conductive rigid board 5 are circular ring structures.

[0044] In practical implementation, the conductive flexible plate 52 and the conductive rigid plate 5 will not affect the normal imaging range of the device. The conductive flexible plate 52 only contacts the edge of the lens glass plate 6. The edge of the lens glass plate 6 in this device is not within the imaging range, so it will not affect normal imaging. It should be noted that the conductive flexible plate 52 is made of a relatively soft material and will not cause significant damage to the lens glass plate 6. The impact of the conductive flexible plate 52 on the lens glass plate 6 when it contacts the lens glass plate 6 is negligible, thus avoiding the reduction of the lifespan of the lens glass plate 6.

[0045] Please see Figures 1 to 11 A drive conductive rod 51 is fixedly connected to the outer wall of the conductive rigid plate 5 at equal angles; The inner wall of the outer ring cylinder 3 is provided with guide slides at equal angles; The inner wall of the inner ring cylinder 2 is provided with guide channels at equal angles; The drive conductive rod 51 is slidably sleeved with the guide channel; The drive conductive rod 51 is slidably connected to the guide channel.

[0046] The guide slide is inclined; The shape of the guide channel is the same as the shape of the guide slide.

[0047] In practice, when the outer ring cylinder 3 is rotated, the guide slide is inclined, and the drive conductive rod 51 slides inside the guide slide due to the limit. The drive conductive rod 51 rotates in the direction of the guide slide and moves closer to the lens glass plate 6. Therefore, it will drive the conductive spring 53 to move towards the lens glass plate 6 and compress the conductive spring 53. The conductive spring 53 tightly adheres the conductive flexible plate 52 to the lens glass plate 6. The charge on the lens glass plate 6 will be transferred to the outer ring cylinder 3 through the conductive flexible plate 52, the conductive spring 53, the conductive rigid plate 5, and the drive conductive rod 51. The charge will be quickly conducted to the user's finger and then grounded through the human body, such as by contacting the ground, forming a charge release path. This effectively avoids the accumulation of static electricity on the lens glass plate 6. Therefore, the lens glass plate 6 will not attract dust from the air due to static electricity, and the imaging effect will not be affected by dust on the lens glass plate 6 over time.

[0048] A conductive spring piece 54 is fixedly connected to the inner wall of the conductive spring 53; One end of the conductive spring 54 is fixedly connected to the conductive flexible plate 52.

[0049] In practical implementation, when the conductive spring 53 is compressed, the part of its coil that is far away from the conductive flexible plate 52 can be connected to the conductive flexible plate 52 through the conductive spring sheet 54. The conductive spring sheet 54 has conductive properties and elasticity. When the conductive spring 53 is compressed, the part of its coil that is far away from the conductive flexible plate 52 can press the conductive flexible plate 52 through the conductive spring sheet 54, so that the conductive flexible plate 52 is more evenly attached to the lens glass plate 6, increasing the contact area between the conductive flexible plate 52 and the lens glass plate 6, and improving the efficiency and effect of static electricity removal.

[0050] Working principle: When using this multi-position mechanically switchable thermal imager magnification eyepiece, the outer ring cylinder 3 is first manually rotated. This outer ring cylinder 3 allows for smooth rotation on the lens body 1. During rotation, the outer ring cylinder 3, through the connected mounting bracket 4, generates a linkage effect, thereby pulling the rotating plate 41. The displacement of the rotating plate 41 is transmitted to one side of the sealing plate 42. Since one end of the sealing plate 42 is fixed and limited by the positioning rod 43, it cannot move but can only rotate. Therefore, the pulling action of the rotating plate 41 directly drives the sealing plate 42 to rotate around its fixed end. Multiple sealing plates 42 are evenly distributed at equal angles inside the outer ring cylinder 3. When they rotate synchronously until they are tightly fitted against the inner wall of the outer ring cylinder 3, the camera channel originally blocked by the sealing plate 42 is completely exposed (e.g., ...). Figures 5-6 As shown in the image, thermal imaging can then begin.

[0051] It should be noted that the effective range of the eyepiece's imaging channel exactly matches the size of the outer ring tube 3's channel, and the actual effective imaging area of ​​the lens glass plate 6 also matches the size of the outer ring tube 3's channel. The outer ring of the lens glass plate 6's edge is not within the effective range required for imaging. This means that after the sealing plate 42 is rotated to a specific position, its own structure and related components such as the conductive spring 53 will not interfere with the normal imaging function.

[0052] Furthermore, the multiple sealing plates 42 are arranged in a staggered pattern, which ensures that the sealing plates 42 will not interfere with each other or get stuck during rotation, thus guaranteeing smooth operation. The sealing plates 42 are made of a special material with high hardness. This material not only ensures the structural stability of the sealing plates 42, but also provides effective protection for the lens glass plate 6 when closed, preventing external objects from damaging the lens glass plate 6.

[0053] During the rotation of the outer ring cylinder 3, due to the inclined design of the guide slide, the drive conductive rod 51 is constrained within the guide slide and can only slide along the trend direction of the guide slide. As the outer ring cylinder 3 rotates, the drive conductive rod 51 gradually moves closer to the lens glass plate 6 along the inclined guide slide. This process causes the conductive spring 53 to move towards the lens glass plate 6, compressing the conductive spring 53. The compressed conductive spring 53 further pushes the conductive flexible plate 52, making it tightly adhere to the surface of the lens glass plate 6 (e.g., ...). Figures 9-11 (As shown).

[0054] When charge accumulates on the lens glass element 6, this charge is conducted through the conductive flexible plate 52, then sequentially through the conductive spring 53, the conductive rigid plate 5, and the driving conductive rod 51, and finally conducted to the outer ring cylinder 3. The charge is quickly conducted to the user's finger and forms a complete charge release path through contact between the human body and grounded objects such as the ground. This avoids the large accumulation of static electricity on the surface of the lens glass element 6, thus fundamentally eliminating the phenomenon of dust adhering to the lens glass element 6 due to static electricity adsorption. This reduces dust contamination of the lens glass element 6, ensures that the lens glass element 6 always maintains good imaging effect, and avoids problems such as image blurring and quality degradation caused by dust accumulation.

[0055] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-level mechanically switchable magnification eyepiece for a thermal imager, comprising a lens body (1) and a lens glass plate (6) disposed on the lens body (1), characterized in that: Also includes: The inner ring tube (2) and the outer ring tube (3) are located at one end of the lens body (1). A sealing component located inside the outer ring tube (3) to protect the lens glass plate (6); An electrostatic dissipation component that achieves charge neutralization through contact conduction, located inside the inner ring cylinder (2); The enclosing component includes enclosing plates (42) that are equidistantly distributed inside the outer ring cylinder (3) and open and close adaptively based on the rotation direction of the outer ring cylinder (3). The sealing component also includes a rotating plate (41) that is equidistantly distributed inside the outer ring cylinder (3) for driving the sealing plate (42) to open and close. The electrostatic dissipation component includes a conductive spring (53) disposed inside the inner cylinder (2) for conducting charge. The electrostatic dissipation assembly also includes a conductive flexible plate (52) for conducting charge in contact with the lens glass plate (6) and a conductive rigid plate (5) for driving the conductive flexible plate (52) to adhere to the lens glass plate (6).

2. The multi-level mechanically switchable magnification eyepiece for a thermal imager according to claim 1, characterized in that: The inner ring cylinder (2) is fixedly connected to the lens body (1); The outer ring cylinder (3) is rotatably connected to the lens body (1); The outer ring (3) is fitted over the inner ring (2).

3. The multi-level mechanically switchable magnification eyepiece for a thermal imager according to claim 2, characterized in that: A movable snap-fit ​​assembly is provided between the inner ring cylinder (2) and the outer ring cylinder (3); The movable snap-fit ​​assembly includes a slot evenly opened on the outer wall of the inner ring cylinder (2) and a groove evenly opened on the inner wall of the outer ring cylinder (3); The inner wall of the groove is equipped with a ball spring plate; The retaining ball spring plate is engaged with the retaining slot.

4. The multi-level mechanically switchable magnification eyepiece for a thermal imager according to claim 1, characterized in that: One end of the rotating plate (41) is rotatably connected to the mounting bracket (4); The mounting bracket (4) is fixed to the inner wall of the outer ring cylinder (3); The other end of the rotating plate (41) is provided with a rotating shaft, and the rotating shaft is fixed to one side of the closed plate (42); The bottom of the closed plate (42) is rotatably connected to a positioning rod (43), and one end of the positioning rod (43) is fixedly connected to the inner ring cylinder (2).

5. The multi-level mechanically switchable magnification eyepiece for a thermal imager according to claim 1, characterized in that: The closed plates (42) are arranged at equal angular intervals and in an alternating vertical layout.

6. The multi-level mechanically switchable magnification eyepiece for a thermal imager according to claim 1, characterized in that: One side of the conductive flexible plate (52) is fixedly connected to one end of the conductive spring (53); One side of the conductive rigid plate (5) is fixedly connected to the other end of the conductive spring (53).

7. The multi-level mechanically switchable magnification eyepiece for a thermal imager according to claim 6, characterized in that: Both the conductive flexible plate (52) and the conductive rigid plate (5) are circular ring structures.

8. The multi-level mechanically switchable magnification eyepiece for a thermal imager according to claim 7, characterized in that: The outer wall of the conductive rigid plate (5) is fixedly connected with a driving conductive rod (51) at equal angles. The inner wall of the outer ring cylinder (3) is provided with guide slides at equal angles; The inner wall of the inner ring cylinder (2) is provided with guide channels at equal angles; The driving conductive rod (51) is slidably sleeved with the guide channel; The drive conductive rod (51) is slidably connected to the guide channel.

9. The multi-level mechanically switchable magnification eyepiece for a thermal imager according to claim 6, characterized in that: The guide slide is inclined; The shape of the guide channel is the same as the shape of the guide slide.

10. The multi-level mechanically switchable magnification eyepiece for a thermal imager according to claim 1, characterized in that: The inner wall of the conductive spring (53) is fixedly connected to a conductive spring sheet (54). One end of the conductive spring (54) is fixedly connected to the conductive flexible plate (52).

Images