Imaging mechanism and optical imaging system

Abstract

The utility model discloses an imaging mechanism and an optical imaging system. The imaging mechanism comprises a base, a cam lever, a guide structure and a zoom lens group, the number of the cam rod is one, the cam rod is rotatably connected to the base, and the outer surface of the cam rod is provided with a zoom curve groove; the guide structure is arranged on the base, the zoom lens group is connected to the guide structure in a sliding mode, and linear movement of the zoom lens group is guided through the guide structure; a first guide nail is arranged on the zoom lens group, the end part of the first guide nail is inserted into the zoom curve groove, and in the rotating process of the cam rod, the first guide nail can move in the zoom curve groove and drive the zoom lens group to linearly move. The technical effects that the rigidity of the cam part is improved, the processing difficulty is reduced, the processing precision is improved, the arrangement number of light paths in the lens group is not limited by the cam part, and the volume efficiency of the imaging mechanism is improved are realized.

Description

Technical Field

[0001] This utility model relates to the field of optical equipment technology, and more specifically, to an imaging mechanism and an optical imaging system. Background Technology

[0002] Continuous zoom utilizes a lens group moving mechanism within an optical system to control the movement of the optical lens group, thereby changing the combined focal length of the system while maintaining the image plane position essentially constant. A cam mechanism is one type of lens group moving mechanism capable of achieving continuous changes in the combined focal length of the optical system. Through a zoom curve groove, the cam mechanism can continuously change the position of the lens group to achieve the purpose of zooming.

[0003] In related technologies, the cam mechanism includes a cam cylinder with a magnification curve groove penetrating the cylinder wall. The lens assembly is installed inside the cam cylinder and connected to the magnification curve groove via a connector. Rotating the cam cylinder moves the lens assembly. However, this cam mechanism is limited by the cam cylinder and is best suited for arranging one optical path. When there is more than one optical path, its volume utilization rate decreases significantly, leading to an increased design size that cannot meet the requirements of miniaturization. Furthermore, the magnification curve groove penetrating the cylinder wall significantly reduces the rigidity of the cam cylinder, limiting the number of magnification curve grooves and increasing the manufacturing difficulty. Utility Model Content

[0004] The main purpose of this invention is to provide an imaging mechanism and an optical imaging system to solve the problems of low volume efficiency of cam mechanisms in related technologies, and that the variable magnification curve grooves significantly reduce the rigidity of the cam cylinder, resulting in a limited number of variable magnification curve grooves and high overall processing difficulty.

[0005] To achieve the above objectives, this utility model provides an imaging mechanism, comprising: a base, a cam rod, a guide structure, and a zoom lens assembly; wherein,

[0006] The cam rod is configured as a single rod, which is rotatably connected to the base, and the outer surface of the cam rod is provided with a variable magnification curve groove;

[0007] The guide structure is disposed on the base, and the zoom lens group is slidably connected to the guide structure, which guides the linear movement of the zoom lens group.

[0008] The zoom lens assembly is provided with a first guide pin, the end of which is inserted into the zoom curve groove. During the rotation of the cam rod, the first guide pin can move within the zoom curve groove and drive the zoom lens assembly to move linearly.

[0009] Optionally, it also includes a compensation lens group, which is provided with an optical path corresponding to the zoom lens group, and a second guide pin is provided on the compensation lens group;

[0010] The cam rod is provided with at least two variable magnification curve grooves;

[0011] The ends of the first guide pin and the second guide pin are respectively inserted into the two zoom curve grooves. During the rotation of the cam rod, the first guide pin can move in the corresponding zoom curve groove and drive the zoom lens group to move linearly. The second guide pin can move in the corresponding zoom curve groove and drive the compensation lens group to move linearly.

[0012] Optionally, the base includes a base plate and a fixing component, the fixing component being fixedly disposed at both ends of the base plate, both ends of the cam rod being rotatably connected to the corresponding fixing component, and both ends of the guide structure being fixedly connected to the fixing component.

[0013] Optionally, the guide structure includes a guide rod, which is fixed to the base, and the zoom lens assembly is slidably sleeved on the guide rod.

[0014] Optionally, the guide structure includes a guide rail, which is fixed on the base, and the zoom lens assembly is connected to the guide rail via a guide rail slider.

[0015] Optionally, the guide structure is configured as two sets located on both sides of the cam rod, and the two sides of the zoom lens group are slidably connected to the guide structure.

[0016] Optionally, the first guide pin is located in the middle of the zoom lens assembly, and the two sets of guide structures are symmetrically arranged along the axis of the cam rod.

[0017] Optionally, the zoom lens assembly includes a main body and a lens assembly disposed within the main body;

[0018] The main body has upwardly extending support arms on both sides, and the support arms on both sides are connected to the corresponding guide structures.

[0019] Optionally, it also includes a drive motor and a transmission assembly, wherein the drive motor is fixed on the base, one end of the transmission assembly is connected to the cam rod, and the other end is connected to the drive motor.

[0020] Optionally, the transmission assembly includes a gear set comprising a plurality of meshing gears, at least one of the plurality of gears being fixedly connected to the output shaft of the drive motor, and at least one of the plurality of gears being sleeved and fixed on the cam rod.

[0021] Optionally, it also includes a limit switch, which is disposed on the base and is used to trigger when the zoom lens assembly moves to a set limit position.

[0022] According to another aspect of the present invention, an optical imaging system is provided, including the imaging mechanism described above.

[0023] Alternatively, the optical imaging system may be an exoscope system or a surgical microscope system.

[0024] In this embodiment of the invention, a base, a cam rod, a guide structure, and a zoom lens assembly are provided. The cam rod is a single unit rotatably connected to the base, and its outer surface has a zoom curve groove. The guide structure is located on the base, and the zoom lens assembly is slidably connected to the guide structure, which guides the linear movement of the zoom lens assembly. The zoom lens assembly has a first guide pin, the end of which is inserted into the zoom curve groove. During the rotation of the cam rod, the first guide pin can move within the zoom curve groove, driving the zoom lens assembly to move linearly. During zooming, by rotating the cam rod, the first guide pin moves within the zoom curve groove, driving the zoom lens assembly to move linearly along the axial direction of the cam rod under the action of the guide structure, thus adjusting the spatial position of the zoom lens assembly.

[0025] In this embodiment of the utility model, on the one hand, the variable magnification curve groove formed on the outer surface of the cam rod has little impact on the stiffness of the cam rod, effectively improving the stiffness of the cam part. On the other hand, under the premise of meeting certain stiffness requirements, more variable magnification curve grooves can be set on the cam rod for mounting multiple zoom lens groups. Furthermore, during processing, slotting on the surface of the cam rod is simpler than slotting through the wall of the cam cylinder, thus solving the problem in the related art that setting variable magnification curve grooves on the cam cylinder would significantly reduce the stiffness of the cam cylinder, resulting in a limited number of variable magnification curve grooves and a higher overall processing difficulty.

[0026] On the other hand, after opening the zoom curve groove on the cam rod, the zoom lens group can be arranged outside the cam rod. The two are connected by the first guide pin, so that the number of optical paths in the zoom lens group is not limited by the structure of the cam rod. One or more optical paths can be arranged according to the needs, and the volume utilization of the imaging mechanism can be improved. This solves the problems in the related technology where the cam mechanism is limited by the structure of the cam cylinder, making it difficult to set up multiple optical paths, resulting in low volume efficiency and large limitations in use.

[0027] Furthermore, the lens group magnification is achieved through a single cam rod, resulting in a simpler structural layout, reduced installation accuracy requirements for the entire device, and a corresponding reduction in motion control requirements. Attached Figure Description

[0028] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model, making other features, objects, and advantages of the utility model more apparent. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0029] Figure 1 This is a schematic diagram of the axial structure of the imaging mechanism according to an embodiment of the present invention;

[0030] Figure 2 This is a cross-sectional structural schematic diagram of the imaging mechanism according to an embodiment of the present utility model;

[0031] Figure 3 This is a schematic diagram of the connection between the cam rod and the drive motor according to an embodiment of the present invention;

[0032] Figure 4 This is a connection diagram of the gear set according to an embodiment of the present utility model;

[0033] The components include: 1. Base; 101. Base plate; 102. Fixing assembly; 1020. Fixing plate; 1021. Lens mounting hole; 1022. Lens assembly; 2. Cam rod; 3. Limit switch; 4. Guide structure; 40. Guide rod; 5. Magnification lens assembly; 50. Main body; 51. Support arm; 6. First guide pin; 7. Magnification curve groove; 8. Drive motor; 9. Gear set; 90. Gear; 10. Compensation lens assembly; and 11. Second guide pin. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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 should fall within the protection scope of the present invention.

[0035] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this utility model described herein.

[0036] In this invention, the terms "upper," "lower," "inner," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0037] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0038] Furthermore, the terms "set up," "equipped with," "connected," and "fixed" should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] In addition, the term "multiple" should mean two or more.

[0040] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] To solve related technical problems, such as Figures 1 to 2 As shown, this embodiment of the invention provides an imaging mechanism, including: a base 1, a cam rod 2, a guide structure 4, and a zoom lens group 5; wherein,

[0042] The cam rod 2 is configured as a single rod, which is rotatably connected to the base 1. The outer surface of the cam rod 2 is provided with a variable magnification curve groove 7.

[0043] The guide structure 4 is mounted on the base 1, and the zoom lens assembly 5 is slidably connected to the guide structure 4. The zoom lens assembly 5 has one or more optical paths, and the base 1 has optical path channels corresponding to the optical paths. When the zoom lens assembly 5 includes two optical paths, it can form a stereoscopic image. The zoom lens assembly 5 is provided with a first guide pin 6, the end of which is inserted into the zoom curve groove 7. During the rotation of the cam rod 2, the first guide pin 6 can move within the zoom curve groove 7.

[0044] In this embodiment, the base 1, serving as the mounting foundation for various components, can have various structural forms, which are not limited here. The cam rod 2 is mounted on the base 1, and as the actuating structure during the continuous zoom process, it is rotatably connected to the base 1. To ensure smooth rotation of the cam rod 2, the cam rod 2 and the base 1 can be connected via bearings.

[0045] like Figure 2 As shown, the cam rod 2 is a long, cylindrical rod structure. A magnification curve groove 7 is provided on the outer circumference of the cam rod 2, and the number of magnification curve grooves 7 corresponds to the number of zoom lens assemblies 5. In this embodiment, the magnification curve groove 7 is an arc-shaped groove formed on the outer surface of the cam rod 2. Since the cam rod 2 itself has a certain diameter, the impact on the stiffness of the cam rod 2 after forming the magnification curve groove 7 is small. Furthermore, the magnification curve groove 7 can be a linearly changing groove, making the movement of the zoom lens assembly 5 linear. Alternatively, the magnification curve groove 7 can be a non-linearly changing groove, making the movement of the zoom lens assembly 5 non-linear. The appropriate magnification curve groove can be adopted according to actual needs.

[0046] Since the zoom lens assembly 5 needs to move using the zoom curve groove 7 during the rotation of the cam rod 2, the zoom lens assembly 5 and the zoom curve groove 7 are connected by a first guide pin 6. In other words, in this embodiment, the first end of the first guide pin 6 is fixedly connected to the zoom lens assembly 5, and the second end of the first guide pin 6 is inserted into the zoom curve groove 7 and can slide within the zoom curve groove 7. During the rotation of the cam rod 2, the first guide pin 6 moves within the zoom curve groove 7 according to a certain trajectory, thereby causing the zoom lens assembly 5 connected to the first guide pin 6 to move linearly according to a corresponding functional relationship.

[0047] The installation position of the first guide pin 6 on the zoom lens assembly 5 is determined according to the arrangement position of the cam rod 2. When the cam rod 2 is arranged below the zoom lens assembly 5, the first guide pin 6 is correspondingly arranged below the zoom lens assembly 5. The first guide pin 6 and the zoom lens assembly 5 can be an integral structure or a detachable connection structure, and this embodiment does not impose any restrictions on this.

[0048] In one embodiment, the zoom lens group 5 in the imaging mechanism can be set to one. Of course, multiple zoom lens groups can also be set according to actual needs.

[0049] In another embodiment of the imaging mechanism, multiple zoom lens groups 5 are configured, and correspondingly, multiple zoom curve grooves 7 are provided on the cam rod 2. Each zoom curve groove 7 corresponds to one zoom lens group 5, and the two are connected by a first guide pin 6. During the rotation of the cam rod 2, the multiple zoom curve grooves 7 simultaneously control the movement of multiple zoom lens groups 5. Based on this, some or all of the zoom curve grooves 7 have different trajectories, thereby enabling different zoom lens groups 5 to move along different trajectories, thus providing a higher zoom ratio, better aberration correction, a more compact system design, dynamic aberration balance, and more flexible trajectory optimization. Of course, the trajectories of the multiple zoom curve grooves 7 can also remain the same, and this embodiment does not impose any limitations on this.

[0050] Since the zoom lens assembly 5 is mounted on the outside of the cam rod 2 via the corresponding first guide pin 6, the number of optical paths within the zoom lens assembly 5 is not limited by the cam rod 2. This allows the zoom lens assembly 5 to have two or more optical paths as needed, thereby achieving a stereoscopic imaging effect. For example, in one embodiment, each zoom lens assembly 5 has two parallel optical paths, forming a binocular imaging mechanism. To facilitate the transmission of optical paths, this embodiment provides optical path channels on the base 1 corresponding to the optical paths within the zoom lens assembly 5. The optical path channels can be through holes, lens assemblies, etc., opened on the base 1, and are not limited in this embodiment.

[0051] In this embodiment, the rotation of the cam rod 2 controls the linear movement of the zoom lens assembly 5, thereby changing the position of the zoom lens assembly 5. For example... Figure 1 and Figure 2 As shown, to enable the zoom lens assembly 5 to move precisely in a straight line under the rotation of the cam rod 2, a guide structure 4 is also provided on the base 1 in this embodiment. The zoom lens assembly 5 is slidably connected to the guide structure 4. The guide structure 4 guides the linear movement of the zoom lens assembly 5 and restricts the rotational degree of freedom of the zoom lens assembly 5 to achieve linear motion. In addition, the guide structure 4 can also have various structural forms. In one embodiment, the guide structure 4 includes a guide rod, on which the zoom lens assembly 5 can be slidably sleeved. In another embodiment, the guide structure 4 includes a guide rail and a slider, with the slider slidably mounted on the guide rail, and the zoom lens assembly 5 connected to the slider.

[0052] In summary, in this embodiment of the present invention, on the one hand, the variable magnification curve groove 7 formed on the outer surface of the cam rod 2 has little impact on the stiffness of the cam rod 2, effectively improving the stiffness of the cam part. On the other hand, under the premise of meeting the stiffness requirements, more variable magnification curve grooves 7 can be set on the cam rod 2 for mounting multiple zoom lens groups 5. Furthermore, during processing, slotting on the surface of the cam rod 2 is simpler than slotting through grooves on the cylinder wall of the cam cylinder, thereby solving the problem in the related art that setting variable magnification curve grooves 7 on the cam cylinder would significantly reduce the stiffness of the cam cylinder, resulting in a limited number of variable magnification curve grooves 7 and a higher overall processing difficulty.

[0053] On the other hand, after the zoom curve groove 7 is opened on the cam rod 2, the zoom lens group 5 can be arranged outside the cam rod 2. The two are connected by the first guide pin 6, so that the number of optical paths in the zoom lens group 5 is not limited by the structure of the cam rod 2. One or more optical paths can be arranged according to the needs, and the volume utilization rate of the imaging mechanism can be improved. This solves the problems in the related technology where the cam mechanism is limited by the structure of the cam cylinder, making it difficult to set up multiple optical paths, resulting in low volume efficiency and large limitations in use.

[0054] Furthermore, in this embodiment, the magnification of the lens group is achieved through a single cam rod 2. Compared with the method of setting multiple cam rods, the structural layout is simpler, the installation accuracy requirements of the entire device are reduced, and the requirements for motion control are also reduced accordingly.

[0055] In one implementation, such as Figure 1 and Figure 2 As shown, in order to improve imaging quality, eliminate image plane drift and correct aberrations, the imaging mechanism in this embodiment also includes a compensation lens group 10. The compensation lens group 10 is provided with an optical path corresponding to the zoom lens group 5, and a second guide pin 11 is provided on the compensation lens group 10.

[0056] The cam rod 2 is provided with at least two variable magnification curve grooves 7;

[0057] The ends of the first guide pin 6 and the second guide pin 11 are respectively inserted into the two zoom curve grooves 7. During the rotation of the cam rod 2, the first guide pin 6 can move in the corresponding zoom curve groove 7 and drive the zoom lens group 5 to move linearly. The second guide pin 11 can move in the corresponding zoom curve groove 7 and drive the compensation lens group 10 to move linearly.

[0058] Specifically, in this embodiment, the zoom lens group 5 and the compensating lens group 10 are arranged one behind the other. The zoom lens group 5 and the compensating lens group 10 are connected to two zoom curve grooves 7 via a first guide pin 6 and a second guide pin 11, respectively. The linear movement of the zoom lens group 5 and the compensating lens group 10 is controlled simultaneously by the rotation of the cam rod 2. Generally, the compensating lens group 10 and the zoom lens group 5 move in the same direction. Therefore, the trajectories of the zoom curve grooves 7 of the zoom lens group 5 and the compensating lens group 10 are different, so the zoom lens group 5 and the compensating lens group 10 are controlled simultaneously to move in the same direction at different speeds by the rotation of the same cam rod 2. In this embodiment, the cooperation relationship between the second guide pin 11 and the compensating lens group 10 and the zoom curve grooves 7 can be referred to the cooperation relationship between the first guide pin 6 and the zoom lens group 5 and the zoom curve grooves 7 described above, and will not be repeated here.

[0059] Based on this, the zoom curve groove 7 corresponding to the zoom lens group 5 can be a linear or non-linear groove, and the zoom curve groove 7 corresponding to the compensation lens group 10 can be a non-linear groove, thereby allowing the zoom lens group 5 to move linearly or non-linearly, and the compensation lens group 10 to move non-linearly. Of course, this is not restrictive and can be designed according to actual needs.

[0060] In one embodiment of the base 1, such as Figure 1 and Figure 2 As shown, the base 1 includes a base plate 101 and a fixing component 102. The fixing component 102 is fixed at both ends of the base plate 101. The two ends of the cam rod 2 are rotatably connected to the corresponding fixing component 102. The two ends of the guide structure 4 are fixedly connected to the fixing component 102.

[0061] Specifically, in this embodiment, the substrate 101 and the fixing component 102 can be an integral structure or a detachable structure. When it is a detachable structure, the fixing component 102 and the substrate 101 can be fixed by screws or clips, etc. The cam rod 2 is mounted on the fixing component 102. As an action structure in the continuous zoom process, the cam rod 2 is rotatably connected to the fixing component 102. When the fixing component 102 is arranged at both ends of the substrate 101, both ends of the cam rod 2 are rotatably connected to the corresponding fixing component 102. To ensure smooth rotation of the cam rod 2, the cam rod 2 and the fixing component 102 can be connected by bearings. Similarly, after the fixing components 102 are provided at both ends of the substrate 101, both ends of the guide structure 4 can also be fixedly connected to the corresponding fixing components 102.

[0062] In one embodiment, the optical path channel is disposed on the fixed component 102, and the optical path channel may be a through hole or a lens assembly formed on the fixed component 102.

[0063] In one specific embodiment, the fixing assembly 102 includes a fixing plate 1020, the lower end of which is fixedly connected to the substrate 101. The fixing plate 1021 has multiple lens mounting holes 1021, the number and position of which correspond to the number and position of the optical paths of the zoom lens group 5. Lens groups 1022 are installed within the lens mounting holes 1021. The lower part of the fixing plate 1020 is connected to the cam rod 2 via a bearing. Therefore, the imaging mechanism in this embodiment includes at least a front lens group, a zoom lens group 5, and a rear lens group. Furthermore, a compensation lens group 10 can be added between the zoom lens group 5 and the rear lens group, while both the front and rear lens groups are fixed.

[0064] The guide structure 4 provides guidance for the linear movement of the zoom lens assembly 5. In one embodiment, such as... Figure 1 and Figure 2 As shown, the guide structure 4 includes a guide rod 40, which is fixed on the base 1, and the zoom lens assembly 5 is slidably sleeved on the guide rod 40.

[0065] Specifically, in this embodiment, the guide rod 40 has a smooth, rod-shaped structure. The zoom lens assembly 5 has a through-hole, through which it is slidably fitted onto the guide rod 40. To further improve the smoothness and accuracy of the sliding, a linear bearing can be fixed inside the sliding hole, and the linear bearing is fitted and fixed onto the guide rod 40. Additionally, both ends of the guide rod 40 can be welded to the base 1, or inserted into the base 1 and fixed with screws. When the guide rod 40 is a single rod, its cross-section needs to be non-circular to ensure the linear movement of the zoom lens assembly 5.

[0066] When the base 1 includes a base plate 101 and a fixing plate, the two ends of the guide rod 40 can be fixedly connected to the corresponding fixing plate. For example... Figure 2 As shown, when both the zoom lens group 5 and the compensating lens group 10 are included, both the zoom lens group 5 and the compensating lens group 10 are slidably connected to the guide rod 40 through corresponding sliding holes.

[0067] In another embodiment of the guide structure 4, the guide structure 4 includes a guide rail, which is fixed on the base 1, and the zoom lens assembly 5 is connected to the guide rail via a guide rail slider.

[0068] To ensure that the zoom lens group 5 experiences uniform force and precise movement direction during linear motion, such as... Figure 1 As shown, in this embodiment, the guide structure 4 is configured as two sets, located on both sides of the cam rod 2 respectively, and the two sides of the zoom lens group 5 are slidably connected to the guide structure 4 respectively. The two sets of guide structures 4 provide guidance to both sides of the zoom lens group 5, improving the accuracy and smoothness of zoom movement. The same arrangement is followed after setting the compensation lens group 10, which will not be described in detail here.

[0069] Based on this, in order to further facilitate the movement of the zoom lens assembly 5, in this embodiment the first guide pin 6 is located in the middle of the zoom lens assembly 5, and the two guide structures 4 can be symmetrically arranged along the axis of the cam rod 2.

[0070] Specifically, in this embodiment, the cam rod 2 is located between the guide structures 4 on both sides. The middle part of the zoom lens assembly 5 is connected to the zoom curve groove 7 on the cam rod 2 via the first guide pin 6, and the two sides of the zoom lens assembly 5 are respectively connected to the corresponding guide structures 4. During the rotation of the cam rod 2, a force is applied to the middle part of the zoom lens assembly 5, and the zoom lens assembly 5 moves along the guide structures 4 on both sides.

[0071] Optionally, such as Figure 1 As shown, the zoom lens assembly 5 includes a main body 50 and a lens assembly disposed within the main body 50; the main body 50 is provided with two support arms 51, and the two support arms 51 are connected to the corresponding guide structure 4.

[0072] Specifically, in this embodiment, obliquely upward extending support arms 51 can be provided on both sides of the main body 50 for connection with the guide structure 4, especially for sliding connection with the guide rod 40, thereby reducing the lateral space occupied by the main body while meeting the installation space requirements of the guide structure 4. Simultaneously, after being connected to the guide structure 4 via these support arms 51, the installation position of the guide structure 4 on the fixing component 102 is closer to the apex of the fixing component 102, thus leaving more space for arranging a larger front lens group, rear lens group, or zoom lens group on the fixing component 102. Furthermore, in this embodiment, the vertical distance between the axis of the guide structure 4 and the axis of the cam rod 2 is also shorter, which is beneficial for guiding the zoom lens group 5 through the guide structure 4. The compensation lens group 10 can be similarly configured.

[0073] Optionally, such as Figures 1 to 4 As shown, it also includes a drive motor 8 and a transmission assembly. The drive motor 8 is fixed on the base 1, and one end of the transmission assembly is connected to the cam rod 2 and the other end is connected to the drive motor 8.

[0074] Specifically, in this embodiment, the drive motor 8 is fixedly mounted on the base 1, and a motor mounting slot can be provided on the base 1 for mounting the drive motor 8. The output end of the drive motor 8 is connected to the cam rod 2 via a transmission assembly. Depending on the power transmission method, different transmission structures can be selected for the transmission assembly. In one embodiment, a gear transmission method is used, therefore the transmission assembly includes multiple meshing gears 90. In another embodiment, a belt drive or rope drive method can be used; this embodiment does not impose any limitations.

[0075] To ensure the accuracy and stability of the transmission and reduce space occupation, the transmission component in this embodiment includes a gear set 9, which includes multiple meshing gears 90. At least one of the gears 90 is fixedly connected to the output shaft of the drive motor 8, and at least one of the gears 90 is sleeved and fixed on the cam rod 2.

[0076] In one specific embodiment, the gear set 9 includes three gears 90. One gear 90 is fixedly connected to the output shaft of the drive motor 8, and one of the other two gears 90 is sleeved and fixed to the end of the cam rod 2, while the other is rotatably connected to the base 1 via a rotating shaft. The three gears 90 mesh sequentially, and the drive motor 8 drives the three gears 90 to rotate. The rotational speed of the cam rod 2 is controlled by adjusting the gear ratio of the three gears 90. In this embodiment, all three gears 90 are arranged inside the base 1.

[0077] It is understood that, in another specific implementation, the gear set 9 may consist of only two gears 90, which are respectively connected to the drive motor 8 and the cam rod 2 to transmit power.

[0078] To prevent the zoom lens assembly 5 from moving beyond its travel range, this embodiment also includes a limit switch 3, which is located on the base 1 and is triggered when the zoom lens assembly 5 moves to a set limit position.

[0079] In one embodiment, when the imaging mechanism also includes a compensating lens group 10, two limit switches 3 are provided, respectively arranged on the fixed components 102 at both ends. One limit switch 3 is triggered when the zoom lens group 5 moves forward to its limit position, and the other limit switch 3 is triggered when the compensating lens group 10 moves backward to its limit position. The drive motor 8 stops moving when either limit switch 3 is triggered. For control purposes, the limit switches 3 and the drive motor 8 can be connected to a control system, for example, a PLC control system can be used to control the drive motor 8.

[0080] In the embodiment where the imaging mechanism includes a zoom lens group 5 and a compensating lens group 10, the continuous zooming process includes: the control system sends a signal to the drive motor 8, the drive motor 8 drives the gear set 9 to rotate, thereby rotating the cam rod 2. The first guide pin 6 and the second guide pin 11 can then move in the corresponding zoom curve groove 7 on the cam rod 2. The first guide pin 6 drives the zoom lens group 5 to move linearly, and the second guide pin 11 drives the compensating lens group 10 to move linearly, so that the zoom lens group 5 and the compensating lens group 10 move along a linear direction according to different movement trajectories, achieving continuous zooming. When the zoom lens group 5 and the compensating lens group 10 move to the set limit position, the corresponding limit switch 3 is triggered, and the control system controls the drive motor 8 to stop running.

[0081] According to another aspect of the present invention, an optical imaging system is provided, including the imaging mechanism described above.

[0082] Alternatively, the optical imaging system may be an exoscope system or a surgical microscope system.

[0083] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An imaging mechanism, characterized by, include: The components include a base, a cam rod, a guide structure, and a zoom lens assembly; among them, The cam rod is configured as a single rod, which is rotatably connected to the base, and the outer surface of the cam rod is provided with a variable magnification curve groove; The guide structure is disposed on the base, and the zoom lens group is slidably connected to the guide structure, which guides the linear movement of the zoom lens group. The zoom lens assembly is provided with a first guide pin, the end of which is inserted into the zoom curve groove. During the rotation of the cam rod, the first guide pin can move within the zoom curve groove and drive the zoom lens assembly to move linearly.

2. The imaging mechanism of claim 1, wherein, It also includes a compensating lens assembly, on which a second guide pin is provided; The cam rod is provided with at least two variable magnification curve grooves; The ends of the first guide pin and the second guide pin are respectively inserted into the two zoom curve grooves. During the rotation of the cam rod, the first guide pin can move in the corresponding zoom curve groove and drive the zoom lens group to move linearly. The second guide pin can move in the corresponding zoom curve groove and drive the compensation lens group to move linearly.

3. The imaging mechanism of claim 1, wherein, The base includes a base plate and a fixing component. The fixing component is fixed at both ends of the base plate. The two ends of the cam rod are rotatably connected to the corresponding fixing component. The two ends of the guide structure are fixedly connected to the fixing component.

4. The imaging mechanism of claim 1, wherein, The guiding structure includes a guide rod, which is fixed on the base, and the zoom lens assembly is slidably sleeved on the guide rod.

5. The imaging mechanism of claim 1, wherein, The guiding structure includes a guide rail, which is fixed on the base, and the zoom lens assembly is connected to the guide rail via a guide rail slider.

6. The imaging mechanism according to any one of claims 1 to 5, wherein The guide structure is configured as two sets and located on both sides of the cam rod, and the two sides of the zoom lens group are slidably connected to the guide structure.

7. The imaging mechanism of claim 6, wherein, The first guide pin is located in the middle of the zoom lens assembly, and the two sets of guide structures are symmetrically arranged along the axis of the cam rod.

8. The imaging mechanism according to claim 1, characterized in that, The zoom lens assembly includes a main body and a lens assembly disposed within the main body; The main body is provided with a support arm, which is connected to the corresponding guide structure.

9. The imaging mechanism of claim 1, wherein, It also includes a drive motor and a transmission assembly. The drive motor is fixed on the base, and one end of the transmission assembly is connected to the cam rod and the other end is connected to the drive motor.

10. The imaging mechanism of claim 9, wherein, The transmission assembly includes a gear set, which includes multiple meshing gears. At least one of the multiple gears is fixedly connected to the output shaft of the drive motor, and at least one of the multiple gears is sleeved and fixed on the cam rod.

11. The imaging mechanism of claim 1, wherein, It also includes a limit switch, which is disposed on the base and is used to trigger when the zoom lens assembly moves to a set limit position.

12. An optical imaging system characterized by, Including the imaging mechanism as described in any one of claims 1 to 11.

13. The optical imaging system of claim 12, wherein, The optical imaging system is an external viewing system or a surgical microscope system.

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