Imaging mechanism and optical imaging system

Abstract

The invention discloses an imaging mechanism and an optical imaging system. The imaging mechanism comprises a base, a cam rod, a guide structure and a zoom lens group, wherein 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 set is connected to the guide structure in a sliding mode, two or more light paths are arranged on the zoom lens set, light path channels corresponding to the light paths are formed in the base, a first guide nail is arranged on the zoom lens set, the end of the first guide nail is inserted into the zoom curve groove, and in the rotating process of the cam rod, the zoom curve groove is formed in the cam rod. The first guide nail can move in the zoom curve groove. The technical effects that the rigidity of the cam part is improved, the machining difficulty is reduced, the machining precision is improved, the number of light paths arranged in the lens group is not limited by the cam part, three-dimensional imaging can be achieved, and the volume efficiency of the imaging mechanism is improved are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical devices, and in particular, to an imaging mechanism and an optical imaging system. Background Art

[0002] Continuous zooming uses a lens group moving mechanism in an optical system to control the movement of an optical lens group to change the combined focal length of the system while keeping the image plane position basically unchanged. A cam mechanism is one of the lens group moving mechanisms that can achieve continuous change of the combined focal length of an optical system. The cam mechanism can continuously change the position of the lens group through a zoom curve groove to achieve the purpose of zooming.

[0003] In related technologies, the cam mechanism includes a cam barrel with a zoom curve groove penetrating the barrel wall. The lens group is installed inside the cam barrel, and the lens group is connected to the zoom curve groove through a connecting member, and the lens group is moved by rotating the cam barrel. However, this cam mechanism is restricted by the cam barrel and is most suitable for arranging one optical path. When there are more than one optical paths, its volume utilization rate will be significantly reduced, resulting in an increase in the designed volume and inability to meet the requirements of miniaturization. Moreover, setting a zoom curve groove penetrating the barrel wall on the cam barrel will significantly reduce the stiffness of the cam barrel, resulting in limited number of zoom curve grooves and relatively high processing difficulty. Summary of the Invention

[0004] The main object of the present invention is to provide an imaging mechanism and an optical imaging system to solve the problems in related technologies that the cam mechanism has low volume efficiency, and the zoom curve groove will significantly reduce the stiffness of the cam barrel, resulting in limited number of zoom curve grooves and relatively high overall processing difficulty.

[0005] To achieve the above object, the present invention provides an imaging mechanism, including: a base, a cam rod, a guiding structure, and a zoom lens group; wherein,

[0006] The cam rod is rotatably connected to the base, and a zoom curve groove is provided on the outer surface of the cam rod;

[0007] The guiding structure is arranged on the base, the zoom lens group is slidably connected to the guiding structure, two or more optical paths are provided on the zoom lens group, an optical path channel corresponding to the optical path is provided on the base, a first guiding pin is provided on the zoom lens group, and the end of the first guiding pin is inserted into the zoom curve groove. During the rotation of the cam rod, the first guiding pin can move in the zoom curve groove.

[0008] Optionally, it further includes a compensation lens group, an optical path corresponding to the zoom lens group is provided on the compensation lens group, and a second guiding pin is provided on the compensation lens group;

[0009] At least two variable magnification curve grooves are provided on the cam rod;

[0010] The end portions of the first guide pin and the second guide pin are respectively inserted into two of the variable magnification curve grooves. During the rotation of the cam rod, the first guide pin can move in the corresponding variable magnification curve groove and drive the variable magnification lens group to move linearly, and the second guide pin can move in the corresponding variable magnification curve groove and drive the compensation lens group to move linearly.

[0011] Optionally, the base includes a base plate and a fixing component. The fixing component is fixed at both ends of the base plate. Both ends of the cam rod are rotatably connected to the corresponding fixing components, and both ends of the guiding structure are fixedly connected to the fixing components.

[0012] Optionally, the guiding structure includes a guiding rod. The guiding rod is fixed on the base, and the variable magnification lens group is slidably sleeved on the guiding rod.

[0013] Optionally, the guiding structure includes a guide rail. The guide rail is fixed on the base, and the variable magnification lens group is connected to the guide rail through a guide rail slider.

[0014] Optionally, two sets of guiding structures are provided and are respectively located on both sides of the cam rod. Both sides of the variable magnification lens group are slidably connected to the guiding structures.

[0015] Optionally, the first guide pin is provided in the middle of the variable magnification lens group, and the two sets of guiding structures are symmetrically arranged along the axis of the cam rod.

[0016] Optionally, the variable magnification lens group includes a main body and a lens component provided in the main body;

[0017] Both sides of the main body are provided with support arms extending obliquely upward, and the support arms on both sides are connected to the corresponding guiding structures.

[0018] Optionally, it further includes a driving motor and a transmission component. The driving motor is fixed on the base. One end of the transmission component is in transmission connection with the cam rod, and the other end is in transmission connection with the driving motor.

[0019] Optionally, the transmission component includes a gear set. The gear set includes a plurality of meshing gears. At least one of the plurality of gears is fixedly connected to the output shaft of the driving motor, and at least one of the plurality of gears is sleeved and fixed on the cam rod.

[0020] Optionally, it further includes a limit switch. The limit switch is provided on the base and is used to be triggered when the variable magnification lens group moves to a set limit position.

[0021] According to another aspect of the present invention, there is provided an optical imaging system including the above-mentioned imaging mechanism.

[0022] Optionally, the optical imaging system is an external viewing mirror system or a surgical microscope system.

[0023] In an embodiment of the present invention, a base, a cam rod, a guiding structure and a zoom lens group are provided. Among them, the cam rod is rotatably connected to the base, and a zoom curve groove is provided on the outer surface of the cam rod. The guiding structure is arranged on the base, the zoom lens group is slidably connected to the guiding structure, multiple optical paths are provided on the zoom lens group, optical path channels corresponding to the optical paths are provided on the base, a first guiding pin is provided on the zoom lens group, and the end of the first guiding pin is inserted into the zoom curve groove. During the rotation of the cam rod, the first guiding pin can move in the zoom curve groove. During the zooming process, by rotating the cam rod, the first guiding pin moves in the zoom curve groove, and drives the zoom lens group to linearly move along the axial direction of the cam rod under the action of the guiding structure, adjusting the spatial position of the zoom lens group, and the multiple optical paths provided by the zoom lens group can achieve three-dimensional imaging.

[0024] In an embodiment of the present invention, on the one hand, the zoom curve groove opened on the outer surface of the cam rod has little influence on the stiffness of the cam rod, effectively improving the stiffness of the cam part, and on the premise of meeting certain stiffness requirements, more zoom curve grooves can be selected to be provided on the cam rod for installing multiple zoom lens groups. And during processing, grooving on the surface of the cam rod is simpler than opening a through groove on the barrel wall of the cam barrel, thus solving the problem in the related art that setting a zoom curve groove on the cam barrel will significantly reduce the stiffness of the cam barrel, resulting in limited number of zoom curve grooves and higher overall processing difficulty.

[0025] On the other hand, after the zoom curve groove is opened on the cam rod, the zoom lens group can be arranged outside the cam rod, and the two are connected by the first guiding pin, so that the number of optical paths in the zoom lens group is not limited by the structure of the cam rod, and multiple optical paths can be arranged according to requirements to achieve three-dimensional imaging, and the effect of improving the volume utilization rate of the imaging mechanism can be achieved, thereby solving the problems in the related art that the cam mechanism is limited by the structure of the cam barrel, it is difficult to set multiple optical paths, the volume efficiency is low, the imaging effect is poor, and the use limitation is large. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, making other features, objects and advantages of the present invention more obvious. The schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 is an axonometric structural schematic diagram of the imaging mechanism in an embodiment of the present invention;

[0028] Figure 2 is a schematic cross-sectional structure diagram of the imaging mechanism in an embodiment of the present invention;

[0029] Figure 3 is a schematic structure diagram of the connection between the cam rod and the driving motor in an embodiment of the present invention;

[0030] Figure 4 is a schematic connection diagram of the gear set in an embodiment of the present invention;

[0031] Wherein, 1 is the base, 101 is the substrate, 102 is the fixing component, 1020 is the fixing plate, 1021 is the lens group mounting hole, 1022 is the lens group, 2 is the cam rod, 3 is the limit switch, 4 is the guiding structure, 40 is the guiding rod, 5 is the zoom lens group, 50 is the main body, 51 is the support arm, 6 is the first guiding pin, 7 is the zoom curve groove, 8 is the driving motor, 9 is the gear set, 90 is the gear, 10 is the compensation lens group, and 11 is the second guiding pin. Detailed implementation manners

[0032] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to describe the embodiments of the present invention here.

[0034] In the present invention, the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0035] Moreover, in addition to being able to represent an orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0036] In addition, terms such as "arranged", "provided with", "connected", "fixed", etc. should be understood in a broad sense. 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 directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, the meaning of the term "plurality" should be two or more.

[0038] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0039] To solve the related technical problems, such as Figures 1 to 2 As shown, an imaging mechanism is provided in an embodiment of the present invention, including: a base 1, a cam rod 2, a guiding structure 4, and a zoom lens group 5; wherein,

[0040] The cam rod 2 is rotatably connected to the base 1, and a zoom curve groove 7 is provided on the outer surface of the cam rod 2;

[0041] The guiding structure 4 is arranged on the base 1, the zoom lens group 5 is slidably connected to the guiding structure 4, two or more optical paths are provided on the zoom lens group 5, and an optical path channel corresponding to the optical path is provided on the base 1, capable of forming a stereoscopic image. A first guiding pin 6 is provided on the zoom lens group 5, and the end of the first guiding pin 6 is inserted into the zoom curve groove 7. During the rotation of the cam rod 2, the first guiding pin 6 can move in the zoom curve groove 7.

[0042] In this embodiment, the base 1 has various structural forms as the installation foundation for each component, which is not limited herein. The cam rod 2 is installed on the base 1. The cam rod 2 serves as the action structure during the continuous zooming process and is rotatably connected to the base 1. To enable the smooth rotation of the cam rod 2, the cam rod 2 and the base 1 can be connected through a bearing.

[0043] Such as Figure 2As shown, the cam rod 2 is a long strip-shaped round rod structure. A variable magnification curve groove 7 is provided on the outer circumferential surface of the cam rod 2, and the number of variable magnification curve grooves 7 corresponds to the number of variable magnification lens groups 5. In this embodiment, the variable magnification curve groove 7 is an arc groove opened on the outer surface of the cam rod 2. Since the cam rod 2 itself has a certain diameter, the influence on the stiffness of the cam rod 2 after opening the variable magnification curve groove 7 is small. In addition, the variable magnification curve groove 7 can be a linearly varying groove, so that the movement of the variable magnification lens group 5 is a linear movement. The variable magnification curve groove 7 can also be a non-linearly varying groove, so that the movement of the variable magnification lens group 5 is a non-linear movement, and the corresponding variable magnification curve groove can be adopted according to actual needs.

[0044] Since the variable magnification lens group 5 needs to move by using the variable magnification curve groove 7 during the rotation of the cam rod 2, the variable magnification lens group 5 and the variable magnification 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 variable magnification lens group 5, and the second end of the first guide pin 6 is inserted and matched with the variable magnification curve groove 7 and can slide in the variable magnification curve groove 7. During the rotation of the cam rod 2, the first guide pin 6 moves in a certain trajectory in the variable magnification curve groove 7, so that the variable magnification lens group 5 connected to the first guide pin 6 moves in a straight line according to the corresponding function relationship.

[0045] The installation position of the first guide pin 6 on the variable magnification lens group 5 is determined according to the arrangement position of the cam rod 2. When the cam rod 2 is arranged below the variable magnification lens group 5, the first guide pin 6 is correspondingly arranged below the variable magnification lens group 5. The connection between the first guide pin 6 and the variable magnification lens group 5 can be an integral structure or a detachable connection structure, and this is not limited in this embodiment.

[0046] In one implementation, the variable magnification lens group 5 in the imaging mechanism can be set to one. Of course, the variable magnification lens group can also be set to multiple according to actual needs.

[0047] In another implementation of the imaging mechanism, the variable magnification lens group 5 in the imaging mechanism is set to multiple. Correspondingly, a plurality of variable magnification curve grooves 7 are provided on the cam rod 2, and each variable magnification curve groove 7 corresponds to a variable magnification lens group 5, and the two are connected by a first guide pin 6. During the rotation of the cam rod 2, the movement of the multiple variable magnification lens groups 5 is controlled simultaneously by using the multiple variable magnification curve grooves 7. On this basis, the trajectories of some or all of the multiple variable magnification curve grooves 7 are different, so that different variable magnification lens groups 5 can be controlled to move along different trajectories, thereby being able to provide a higher variable magnification ratio, better aberration correction, a more compact system design, dynamic aberration balance, and more flexible trajectory optimization. Of course, the trajectories of the multiple variable magnification curve grooves 7 can also be the same, and this is not limited in this embodiment.

[0048] Since in the present invention, the zoom lens group 5 is mounted on the outer side of the cam rod 2 through the corresponding first guide pins 6, the number of optical paths provided in the zoom lens group 5 is not limited by the cam rod 2. This enables two or more optical paths to be provided in the zoom lens group 5 as needed, thereby achieving the effect of stereoscopic imaging. For example, in one embodiment, two parallel optical paths are provided in the zoom lens group 5 to form a binocular imaging mechanism. To facilitate the transmission of the optical paths, in this embodiment, an optical path channel corresponding to the optical paths in the zoom lens group 5 is provided on the base 1. The optical path channel can be a through hole, a lens group, etc. opened on the base 1, and is not limited in this embodiment.

[0049] In this embodiment, the rotation of the cam rod 2 is used to control the linear movement of the zoom lens group 5 and change the position of the zoom lens group 5. As Figure 1 and Figure 2 shown, to enable the zoom lens group 5 to accurately move linearly under the rotation of the cam rod 2, a guiding structure 4 is further provided on the base 1 in this embodiment. The zoom lens group 5 is slidably connected to the guiding structure 4. The guiding structure 4 guides the linear movement of the zoom lens group 5 and at the same time restricts the rotational freedom of the zoom lens group 5 to achieve linear motion. In addition, the guiding structure 4 also has various structural forms. In one embodiment, the guiding structure 4 is a structure including a guide rod, and the zoom lens group 5 can be slidably sleeved on the guide rod. In another embodiment, the guiding structure 4 is a structure including a guide rail and a slider, the slider is slidably mounted on the guide rail, and the zoom lens group 5 is connected to the slider.

[0050] In the embodiment of the present invention, on the one hand, the variable magnification curve groove 7 opened on the outer surface of the cam rod 2 has little influence on the stiffness of the cam rod 2, effectively improving the stiffness of the cam part. And on the premise of meeting the stiffness requirements, more variable magnification curve grooves 7 can be selected to be provided on the cam rod 2 for mounting multiple zoom lens groups 5. And during processing, grooving on the surface of the cam rod 2 is simpler than opening a through groove on the barrel wall of the cam barrel. Thus, it solves the problem in the related art that setting the variable magnification curve groove 7 on the cam barrel will significantly reduce the stiffness of the cam barrel, resulting in limited number of variable magnification curve grooves 7 and relatively high overall processing difficulty.

[0051] On the other hand, after the variable magnification curve groove 7 is opened on the cam rod 2, the zoom lens group 5 can be arranged outside the cam rod 2, and the two are connected by the first guide pins 6. This enables the number of optical paths in the zoom lens group 5 to be not limited by the structure of the cam rod 2, and multiple optical paths can be arranged according to requirements to achieve stereoscopic imaging, and can improve the volume utilization rate of the imaging mechanism. Furthermore, it solves the problems in the related art that the cam mechanism is limited by the structure of the cam barrel, it is difficult to set multiple optical paths, the volume efficiency is low, the imaging effect is poor, and the use limitations are relatively large.

[0052] In one embodiment, as Figure 1and Figure 2 As shown in Figure 2 , to improve the imaging quality, eliminate the image plane drift and correct the aberration, the imaging mechanism in this embodiment further includes a compensation mirror group 10. An optical path corresponding to the zoom lens group 5 is provided on the compensation mirror group 10, and a second guiding pin 11 is provided on the compensation mirror group 10.

[0053] At least two zoom curve grooves 7 are provided on the cam rod 2.

[0054] The end parts of the first guiding pin 6 and the second guiding pin 11 are respectively inserted into two of the zoom curve grooves 7. During the rotation of the cam rod 2, the first guiding pin 6 can move in the corresponding zoom curve groove 7 and drive the zoom lens group 5 to move linearly, and the second guiding pin 11 can move in the corresponding zoom curve groove 7 and drive the compensation mirror group 10 to move linearly.

[0055] Specifically, in this embodiment, the zoom lens group 5 and the compensation mirror group 10 are distributed front and back. The zoom lens group 5 and the compensation mirror group 10 are respectively connected to two zoom curve grooves 7 through the first guiding pin 6 and the second guiding pin 11, and the rotation of the cam rod 2 is used to simultaneously control the linear movement of the zoom lens group 5 and the compensation mirror group 10. Generally, the moving directions of the compensation mirror group 10 and the zoom lens group 5 are the same, and the trajectories of the zoom curve grooves 7 corresponding to the zoom lens group 5 and the compensation mirror group 10 are different, so that the rotation of the same cam rod 2 is used to simultaneously control the zoom lens group 5 and the compensation mirror group 10 to move in the same direction at different speeds. In this embodiment, the cooperation relationship between the second guiding pin 11, the compensation mirror group 10 and the zoom curve groove 7 can refer to the cooperation relationship between the first guiding pin 6, the zoom lens group 5 and the zoom curve groove 7, which will not be elaborated here.

[0056] On this basis, the zoom curve groove 7 corresponding to the zoom lens group 5 can be a linearly variable or non-linearly variable groove, and the zoom curve groove 7 corresponding to the compensation mirror group 10 can be a non-linearly variable groove, so that the zoom lens group 5 performs linear or non-linear linear movement, and the compensation mirror group 10 performs non-linear linear movement. Of course, this is not restrictive and can be designed according to actual needs.

[0057] In an embodiment of the base 1, as Figure 1 and Figure 2 shown, the base 1 includes a substrate 101 and a fixing component 102. The fixing component 102 is fixed at both ends of the substrate 101. Both ends of the cam rod 2 are rotatably connected to the corresponding fixing component 102, and both ends of the guiding structure 4 are fixedly connected to the fixing component 102.

[0058] 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 snap-fittings, etc. The cam rod 2 is installed on the fixing component 102. The cam rod 2 serves as an operating structure during the continuous zooming process and 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 make the rotation of the cam rod 2 smooth, the cam rod 2 and the fixing component 102 can be connected by bearings. Similarly, after the fixing component 102 is provided at both ends of the substrate 101, both ends of the guiding structure 4 can also be fixedly connected to the corresponding fixing component 102.

[0059] In one embodiment, the optical path channel is arranged on the fixing component 102, and the optical path channel can be a through hole or a lens group formed on the fixing component 102.

[0060] In a specific embodiment, the fixing component 102 includes a fixing plate 1020. The lower end of the fixing plate 1020 is fixedly connected to the substrate 101. A plurality of lens group mounting holes 1021 are formed on the fixing plate 1021. The number and positions of the lens group mounting holes 1021 correspond to the number and positions of the optical paths of the zoom lens group 5. Lens groups 1022 are installed in the lens group mounting holes 1021. The lower part of the fixing plate 1020 is connected to the cam rod 2 through a bearing. It can be seen that the imaging mechanism in this embodiment at least includes a front lens group, a zoom lens group 5, and a rear lens group. On this basis, a compensation lens group 10 can be added between the zoom lens group 5 and the rear lens group, and both the front lens group and the rear lens group are fixed lens groups.

[0061] The guiding structure 4 provides guidance for the linear movement of the zoom lens group 5. In one embodiment, as Figure 1 and Figure 2 shown, the guiding structure 4 includes a guiding rod 40. The guiding rod 40 is fixedly arranged on the base 1, and the zoom lens group 5 is slidably sleeved on the guiding rod 40.

[0062] Specifically, in this embodiment, the guiding rod 40 is a rod-shaped structure with a smooth surface. A through hole is provided on the zoom lens group 5, and it is slidably sleeved on the guiding rod 40 through the through hole. To further improve the sliding smoothness and accuracy, a linear bearing can be fixed in the through hole, and the linear bearing is sleeved and fixed on the guiding rod 40. In addition, both ends of the guiding rod 40 and the base 1 can be fixedly connected by welding, or inserted into the base 1 and fixed by screws. When the guiding rod 40 is provided as a single one, the cross-section needs to be non-circular to ensure the linear movement of the zoom lens group 5.

[0063] When the base 1 includes a substrate 101 and a fixing plate, both ends of the guiding rod 40 can be fixedly connected to the corresponding fixing plate. AsFigure 2 As shown, when both the variable-power lens group 5 and the compensating lens group 10 are included, the variable-power lens group 5 and the compensating lens group 10 are both slidably connected to the guide rod 40 through corresponding sliding holes.

[0064] In another embodiment of the guide structure 4 , the guide structure 4 includes a guide rail, the guide rail is fixed on the base 1 , and the zoom lens group 5 is connected to the guide rail via a guide rail slider.

[0065] In order to make the zoom lens group 5 receive uniform force and move in an accurate direction during the linear movement, Figure 1 As shown, the guide structures 4 in this embodiment are provided in two groups and are respectively located on both sides of the cam rod 2, and both sides of the zoom lens group 5 are respectively slidably connected to the guide structures 4. The two groups of guide structures 4 provide guidance for both sides of the zoom lens group 5, thereby improving the accuracy and smoothness of the zoom precision movement. The arrangement is similar after the compensation lens group 10 is provided, and no further description is given here.

[0066] On this basis, in order to further facilitate the movement of the zoom lens group 5 , in this embodiment, the first guide pin 6 is arranged in the middle of the zoom lens group 5 , and the two groups of guide structures 4 can be symmetrically arranged along the axis of the cam rod 2 .

[0067] Specifically, in this embodiment, the cam rod 2 is located between the guide structures 4 on both sides, the middle of the zoom lens group 5 is connected to the zoom curved groove 7 on the cam rod 2 through the first guide pin 6, and the two sides of the zoom lens group 5 are respectively connected to the corresponding guide structures 4. The cam rod 2 applies a force to the middle of the zoom lens group 5 during the rotation process, and the zoom lens group 5 moves along the guide structures 4 on both sides. In this embodiment, the zoom lens group is realized by a 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 simultaneously. The compensation lens group 10 and the second guide pin 11 can be arranged in the same way.

[0068] Alternatively, if Figure 1 As shown, the variable power lens assembly 5 includes a main body 50 and a lens assembly arranged in the main body 50 ; the main body 50 is provided with two arms 51 , and the two arms 51 are connected to the corresponding guide structures 4 .

[0069] Specifically, in this embodiment, inclined arms 51 extending obliquely upward can be provided on both sides of the main body 50 for connection with the guiding structure 4, especially for sliding connection with the guiding rod 40. Thus, on the premise of meeting the installation space requirements of the guiding structure 4, the occupation of the main body in the lateral space is reduced. At the same time, after connecting the guiding structure 4 through the inclined arms 51, the installation position of the guiding structure 4 on the fixing component 102 is closer to the vertex of the fixing component 102, thereby leaving more space for arranging a larger front lens group, rear lens group or zoom lens group on the fixing component 102. In addition, in this embodiment, the perpendicular distance between the axis of the guiding structure 4 and the axis of the cam rod 2 is also shorter, which is beneficial to guiding the zoom lens group 5 through the guiding structure 4. The compensating lens group 10 can be arranged in the same way.

[0070] Optionally, as Figures 1 to 4 shown, it further includes a driving motor 8 and a transmission component. The driving motor 8 is fixedly arranged on the base 1, one end of the transmission component is in transmission connection with the cam rod 2, and the other end is in transmission connection with the driving motor 8.

[0071] Specifically, in this embodiment, the driving motor 8 is fixedly installed on the base 1. A motor installation groove can be opened on the base 1 for installing the driving motor 8. The output end of the driving motor 8 is in transmission connection with the cam rod 2 through the transmission component. According to different power transmission methods, different transmission structures can be selected for the transmission component. In one implementation manner, the gear transmission method is adopted, so the transmission component includes a plurality of meshing gears 90. In another implementation manner, the belt transmission or rope transmission method can be adopted, which is not limited in this embodiment.

[0072] To ensure the accuracy, stability of the transmission and reduce the space occupation, in this embodiment, the transmission component includes a gear set 9. The gear set 9 includes a plurality of meshing gears 90. At least one of the plurality of gears 90 is fixedly connected to the output shaft of the driving motor 8, and at least one of the plurality of gears 90 is sleeved and fixed on the cam rod 2.

[0073] In a specific implementation manner, the gear set 9 includes three gears 90. One of the gears 90 is fixedly connected to the output shaft of the driving motor 8. One of the other two gears 90 is sleeved and fixed at the end of the cam rod 2, and the other is rotatably connected to the base 1 through a rotating shaft. The three gears 90 are meshed in sequence. By driving the three gears 90 to rotate through the driving motor 8, the rotation speed of the cam rod 2 is controlled by adjusting the gear ratio. In this embodiment, the three gears 90 are all arranged inside the base 1.

[0074] It can be understood that, in another specific implementation manner, the gear set 9 may only include two gears 90, and the two gears 90 are respectively connected to the driving motor 8 and the cam rod 2 to achieve power transmission.

[0075] To prevent the zoom lens group 5 from moving beyond the limit, a limit switch 3 is further included in this embodiment. The limit switch 3 is disposed on the base 1 and is used to be triggered when the zoom lens group 5 moves to the set limit position.

[0076] In one implementation, when the imaging mechanism further includes a compensation lens group 10, two limit switches 3 are provided and are respectively arranged on the fixed components 102 at both ends. When the zoom lens group 5 moves forward to the limit position, one of the limit switches 3 is triggered. When the compensation lens group 10 moves backward to the limit position, the other limit switch 3 is triggered. When any one of the limit switches 3 is triggered, the drive motor 8 stops moving. To achieve control, the limit switch 3 and the drive motor 8 can be connected to a control system, for example, the drive motor 8 is controlled through a PLC control system.

[0077] In the implementation where the imaging mechanism includes a zoom lens group 5 and a compensation 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 group 9 to rotate, enabling the cam rod 2 to rotate. The first guide pin 6 and the second guide pin 11 can then move in the corresponding zoom curve grooves 7 on the cam rod 2. Among them, the first guide pin 6 drives the zoom lens group 5 to move linearly, and the second guide pin 11 drives the compensation lens group 10 to move linearly, enabling the zoom lens group 5 and the compensation lens group 10 to move along a straight line in accordance with different movement trajectories, thereby achieving continuous zooming. When the zoom lens group 5 and the compensation lens group 10 move to the set limit positions, the corresponding limit switches 3 are triggered, and the control system controls the drive motor 8 to stop running.

[0078] According to another aspect of the present invention, an optical imaging system is provided, including the above-mentioned imaging mechanism.

[0079] Optionally, the optical imaging system is an external viewing mirror system or a surgical microscope system.

[0080] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An imaging mechanism, characterized in that: include: Base, cam rod, guide structure and zoom lens group; wherein, The cam rod is rotatably connected to the base, and a variable-power curved groove is provided on the outer surface of the cam rod; The guide structure is arranged on the base, the magnification lens group is slidably connected to the guide structure, two or more optical paths are arranged on the magnification lens group, and an optical path channel corresponding to the optical path is arranged on the base. The magnification lens group is provided with a first guide pin, and the end of the first guide pin is inserted into the magnification curve groove. During the rotation of the cam rod, the first guide pin can move in the magnification curve groove and drive the magnification lens group to move linearly.

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

3. The imaging mechanism according to claim 1, characterized in that: The base includes a base plate and a fixing assembly, wherein the fixing assembly is fixedly arranged at two ends of the base plate, two ends of the cam rod are rotatably connected to the corresponding fixing assembly, and two ends of the guide structure are fixedly connected to the fixing assembly.

4. The imaging mechanism according to claim 1, characterized in that: The guide structure comprises a guide rod, the guide rod is fixed on the base, and the variable power lens group is slidably sleeved on the guide rod.

5. The imaging mechanism according to claim 1, characterized in that: The guide structure comprises a guide rail, the guide rail is fixed on the base, and the zoom lens group is connected to the guide rail via a guide rail slider.

6. The imaging mechanism according to any one of claims 1 to 5, characterized in that: The guide structure is provided in two groups and is respectively located at two sides of the cam rod, and two sides of the variable power lens group are respectively slidably connected to the guide structure.

7. The imaging mechanism according to claim 6, characterized in that: The first guide pin is arranged in the middle of the zoom lens group, and the two groups 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 variable magnification lens assembly comprises a main body and a lens assembly arranged in the main body; The main body is provided with a support arm, and the support arm is connected to the corresponding guide structure.

9. The imaging mechanism according to claim 1, characterized in that: It also includes a driving motor and a transmission assembly. The driving motor is fixed on the base. One end of the transmission assembly is drivingly connected to the cam rod, and the other end is drivingly connected to the driving motor.

10. The imaging mechanism according to claim 9, characterized in that: The transmission assembly includes a gear set, which includes a plurality of gears meshing with each other, at least one of the plurality of gears is fixedly connected to the output shaft of the drive motor, and at least one of the plurality of gears is sleeved and fixed on the cam rod.

11. The imaging mechanism according to claim 1, characterized in that: It also includes a limit switch, which is arranged on the base and is used to be triggered when the zoom lens group moves to a set limit position.

12. An optical imaging system, characterized in that: Comprising the imaging mechanism as claimed in any one of claims 1 to 11.

13. The optical imaging system according to claim 12, characterized in that: The optical imaging system is an exoscopic system or a surgical microscope system.

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