High-precision translation type endoscope zooming structure and stepping type zooming method

Abstract

The invention discloses a high-precision translation type endoscope zooming structure and a stepping type zooming method. The high-precision translation type endoscope zooming structure comprises an outer lens barrel and a movable lens barrel assembly located in the outer lens barrel. A plurality of electromagnets are fixed on the outer lens cone along the axial direction, and the movable lens cone assembly and the outer lens cone are fixed in the circumferential direction. The movable lens cone assembly is provided with a plurality of first tooth-shaped protrusions arranged in the axial direction, the surface, facing the movable lens cone assembly, of each electromagnet is provided with a plurality of second tooth-shaped protrusions, and when the electromagnets are powered on, the second tooth-shaped protrusions on the powered electromagnets directly face the first tooth-shaped protrusions. And when the second tooth-shaped bulge of one electromagnet is opposite to the first tooth-shaped bulge, the second tooth-shaped bulge of at least one of the rest electromagnets is staggered from the first tooth-shaped bulge. According to the invention, zooming is realized by electrifying one of the electromagnets, the current of the electromagnets does not need to be adjusted, the control program is simple, and the distribution density of the tooth-shaped bulges can determine the movement precision of the movable lens cone, so that precise regulation and control are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to a high-precision translational endoscope zoom structure and a step-by-step zoom method. Background Art

[0002] The endoscope zoom structure achieves focal length changes by adjusting the position of the moving lens along the optical axis. The traditional method is to use a mechanical structure and manually drive the moving lens to move. This driving method has a slow response speed and low positioning accuracy.

[0003] There are also methods in the prior art that use electric drive to adjust the movable lens, such as the zoom structure disclosed in Patent No. CN111897086A, in which electromagnets are arranged on both sides of the movable lens, and the displacement of the movable lens is controlled by adjusting the current of the two electromagnets. Another example is the zoom structure disclosed in Patent No. CN115670350A, in which the movable lens reaches a stable state by balancing the electromagnetic force of the electromagnet and the elastic force of the spring. The above methods have the following defects: First, the above zoom structures all control the movement of the movable lens by adjusting the current of the electromagnet, which requires the design of an accurate algorithm according to actual needs to achieve precise control of the displacement of the movable lens. Therefore, the control program is relatively complicated and the control accuracy is also low; second, since the movable lens is adsorbed only by two electromagnets, it is difficult to control the movable lens, and a slight change in current will cause the movable lens to shake, resulting in poor visual effects when medical staff operate.

[0004] Therefore, it is necessary to design an endoscope zoom structure with fast response speed and high control accuracy. Summary of the invention

[0005] In order to solve the technical problems of low control accuracy and complex control procedures of endoscope zoom structures in the prior art, the present invention provides a high-precision translational endoscope zoom structure and a step-by-step zoom method to solve the above problems.

[0006] The invention provides a high-precision translational endoscope zoom structure, which comprises an outer lens barrel and a movable lens barrel component located inside the outer lens barrel.

[0007] The outer lens barrel is axially fixed with a plurality of electromagnets, and the movable lens barrel assembly is circumferentially fixed to the outer lens barrel.

[0008] The movable lens barrel assembly has a plurality of first tooth-shaped protrusions arranged along the axial direction and extending toward the electromagnet, the first tooth-shaped protrusions are made of a magnetic conductor, and each electromagnet has a plurality of second tooth-shaped protrusions on the surface facing the movable lens barrel assembly. When the electromagnet is energized, the second tooth-shaped protrusions on the energized electromagnet are directly opposite to the first tooth-shaped protrusions, and when the second tooth-shaped protrusion of one of the electromagnets is directly opposite to the first tooth-shaped protrusions, the second tooth-shaped protrusion of at least one of the remaining electromagnets is staggered with the first tooth-shaped protrusions.

[0009] In an optional embodiment of the present invention, the outer lens barrel is fixed with one or more electromagnet groups along the axial direction, each electromagnet group includes a plurality of electromagnets arranged in sequence along the axial direction and connected in parallel with each other, and the electromagnets in different electromagnet groups are connected in series one by one.

[0010] In an optional implementation manner of the present invention, the movable lens barrel assembly comprises an inner lens barrel and a movable lens fixed to each other, and the first tooth-shaped protrusion is located on the surface of the inner lens barrel.

[0011] In an optional embodiment of the present invention, the inner lens barrel and the outer lens barrel have parallel planar portions, the electromagnet is mounted on the planar portion of the outer lens barrel, and a magnetic tooth plate with a first tooth-shaped protrusion is mounted on the planar portion of the inner lens barrel.

[0012] In an optional embodiment of the present invention, the center distance between two adjacent electromagnets is a non-integer multiple of the center distance between two adjacent first tooth-shaped protrusions.

[0013] In an optional embodiment of the present invention, let the number of electromagnets be N, then the difference between the offset distances between the second tooth-shaped protrusions and the first tooth-shaped protrusions of two adjacent electromagnets is the center distance between the two adjacent first tooth-shaped protrusions. Wherein, N is a positive integer.

[0014] In an optional embodiment of the present invention, the number of the second tooth-shaped protrusions on each electromagnet is an odd number, and when the electromagnet is energized, the second tooth-shaped protrusion located in the middle of the energized electromagnet is directly opposite to the first tooth-shaped protrusion.

[0015] In an optional embodiment of the present invention, the widths of the first tooth-shaped protrusion and the second tooth-shaped protrusion are equal, and a plurality of electromagnets are connected in sequence to form a plurality of second tooth-shaped protrusions evenly distributed along the axial direction.

[0016] In an optional embodiment of the present invention, the difference between the number of the first tooth-like protrusions and the number of the second tooth-like protrusions within the same axial length range is 1 to 2, the length of the movable barrel assembly is greater than the total length of each electromagnetic group, and the difference between the length of the movable barrel assembly and the total length of an electromagnetic group is less than half the length of a single electromagnet.

[0017] The present invention also proposes a step-by-step zoom method, which adopts the high-precision translation endoscope zoom structure described above and comprises the following steps: S1: energize one of the electromagnets so that the second tooth-shaped protrusion on the electromagnet is aligned with the first tooth-shaped protrusion.

[0018] S2: Switching the adjacent electromagnets to be energized one by one in turn, the second tooth-shaped protrusion on the electromagnet that is energized after switching is directly opposite to the first tooth-shaped protrusion, causing the movable barrel assembly to be offset. When the electromagnet in step S1 is energized again, the movable barrel assembly moves a distance of one tooth.

[0019] The beneficial effects of the present invention are: (1) The present invention realizes zooming by energizing one of the electromagnets. There is no need to adjust the current of the electromagnet. The control program is simple, and the distribution density of the tooth-like protrusions can determine the movement accuracy of the movable lens barrel, thereby realizing precise control.

[0020] (2) The electromagnet in the present invention is arranged axially, and the movable barrel assembly and the outer barrel can be fixed circumferentially by their own structure. The electromagnet can directly drive the movable barrel assembly to move axially. The arrangement positions of the electromagnet and the tooth-shaped protrusions are also relatively concentrated, thereby simplifying the internal structure of the endoscope.

[0021] (3) The present invention can be provided with a plurality of electromagnet groups, and the electromagnets of different electromagnet groups are connected in series one by one, which can reduce the external control circuit and simplify the control method. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 It is an exploded view of a specific implementation of the high-precision translational endoscope zoom structure of the present invention; Figure 2 is an axial cross-sectional view of a specific implementation of the high-precision translational endoscope zoom structure of the present invention; Figure 3 It is a schematic diagram of the power-on state when the movable lens barrel assembly is at the leftmost equilibrium position in a specific implementation mode of the high-precision translational endoscope zoom structure of the present invention; Figure 4 Is Figure 3 Schematic diagram of the power-on state when the state shown is moved one step to the right; Figure 5 Is Figure 4 Schematic diagram of the power-on state when the state shown is moved one step to the right; Figure 6 Is Figure 5 Schematic diagram of the power-on state when the state shown is moved one step to the right.

[0024] In the figure, 1, outer lens barrel, 2, inner lens barrel, 3, magnetic tooth plate, 301, first tooth-shaped protrusion, 4, movable lens, 5, iron core, 6, coil, 7, front lens barrel assembly, 7-1, front lens barrel, 7-2, first lens, 7-3, second lens, 8, rear lens barrel assembly, 8-1, rear lens barrel, 8-2, third lens, 9, movable lens barrel assembly, 10, electromagnet group, 10-1, first electromagnet, 10-2, second electromagnet, 10-3, third electromagnet, 11, second tooth-shaped protrusion, 12, plane portion, 13, electromagnet. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] Embodiment 1 like Figure 1 and Figure 2 As shown, the present invention proposes a high-precision translational endoscope zoom structure, comprising an outer lens barrel 1 and a movable lens barrel assembly 9 located in the outer lens barrel 1. The outer lens barrel 1 is fixed with a plurality of electromagnets 13 along the axial direction, and the movable lens barrel assembly 9 is circumferentially fixed to the outer lens barrel 1. The circumferential fixation means that the movable lens barrel assembly 9 and the outer lens barrel 1 cannot rotate relative to each other, but can only move relative to each other along the axial direction. The electromagnet 13 generally comprises an iron core 5 and a coil 6 wound on the iron core 5. As shown in the figure, the central axis of the coil 6 is perpendicular to the central axis of the outer lens barrel 1. When the coil 6 is energized, the iron core 5 generates a magnetic field force along the axial direction of the outer lens barrel 1, pushing the movable lens barrel assembly 9 to move.

[0027] The movable lens barrel assembly 9 has a plurality of first tooth-shaped protrusions 301 arranged in the axial direction and extending toward the electromagnet 13, the first tooth-shaped protrusions 301 are made of a magnetic conductor, and each electromagnet 13 has a plurality of second tooth-shaped protrusions 11 on the surface facing the movable lens barrel assembly 9, when the electromagnet 13 is energized, the second tooth-shaped protrusions 11 on the energized electromagnet 13 are directly opposite to the first tooth-shaped protrusions 301, and when the second tooth-shaped protrusions 11 of one of the electromagnets 13 are directly opposite to the first tooth-shaped protrusions 301, the second tooth-shaped protrusions 11 of at least one of the remaining electromagnets 13 are staggered with the first tooth-shaped protrusions 301. The staggered means that the protruding parts of the second tooth-shaped protrusions 11 and the first tooth-shaped protrusions 301 are not exactly opposite.

[0028] Since the first tooth-shaped protrusion 301 is a magnetic conductive material, when the electromagnet 13 is energized, the movable lens barrel assembly 9 will be subjected to electromagnetic force, and the magnetic flux at the tooth-shaped protrusion is the largest, so the second tooth-shaped protrusion 11 of the energized electromagnet 13 will adsorb the first tooth-shaped protrusion 301 closest to it, and since the second tooth-shaped protrusion 11 on other individual or all electromagnets 13 is misaligned with the first tooth-shaped protrusion 301, when the electromagnet 13 with misalignment is energized, the movable lens barrel assembly 9 will move to achieve zooming. The denser the first tooth-shaped protrusion 301 is arranged, the smaller the single movement of the movable lens barrel assembly 9 is, and the higher the zooming accuracy is.

[0029] The present invention only needs to switch different electromagnets 13 to be energized to achieve zooming, and does not need to adjust the current size of the electromagnet 13. Therefore, compared with the traditional zoom structure, the control program of the present invention is simpler. In addition, the traditional zoom structure controls the moving distance by changing the current, so the stability of the moving lens 4 is low, and since the amplitude of the current change cannot be too small, the minimum moving distance of the moving lens 4 cannot be too small, which leads to reduced zoom accuracy. The minimum moving distance of the moving lens barrel assembly 9 in the present invention is related to the distribution density of the tooth-shaped protrusions, and the zoom accuracy can be improved by increasing the distribution density of the tooth-shaped protrusions, and the stability of the moving lens 4 will not be affected. Secondly, the electromagnet 13 in the present invention is arranged along the axial direction, which can directly drive the moving lens barrel assembly 9 to move, there is no conversion of the motion form, and the control accuracy deviation is reduced. The electromagnet 13 and the tooth-shaped protrusions can be arranged only in a local range of the periphery, thereby simplifying the overall structure.

[0030] The movable lens barrel assembly 9 generally includes an inner lens barrel 2 and a movable lens 4 fixed to each other, and the first tooth-shaped protrusion 301 is located on the surface of the inner lens barrel 2. Since the second tooth-shaped protrusion 11 is located on the surface of the electromagnet 13 arranged along the axial direction, the first tooth-shaped protrusion 301 is arranged along the axial direction like the second tooth-shaped protrusion 11. The conventional inner lens barrel 2 and the outer lens barrel 1 are both cylindrical. In order to achieve the circumferential fixation of the two under the premise of reducing the matching parts as much as possible, the present invention designs mutually parallel plane parts 12 on the inner lens barrel 2 and the outer lens barrel 1, and the electromagnet 13 is installed on the plane part 12 of the outer lens barrel 1. The plane part 12 of the inner lens barrel 2 is installed with a magnetic tooth plate 3 with the first tooth-shaped protrusion 301, and the magnetic tooth plate 3 is made of magnetic conductive material. As shown in the figure, the plane part 12 of the outer lens barrel 1 has a mounting hole for the iron core 5 to pass through, and the iron core 5 can be glued and fixed on the mounting hole, and the second tooth-shaped protrusion 11 of the iron core 5 extends into the outer lens barrel 1 and is opposite to the first tooth-shaped protrusion 301.

[0031] In the present invention, when one of the electromagnets 13 is energized, only the second tooth-shaped protrusions 11 of the other individual electromagnets 13 may be staggered with the first tooth-shaped protrusions 301, and the electromagnets 13 with staggered tooth-shaped protrusions may be at any axial position, as long as the electromagnets 13 with staggered tooth-shaped protrusions are switched to be energized when zooming is required. However, if the staggered position is uncertain, it will cause trouble for medical staff to use it, and it is impossible to find a unified operating standard. For the convenience of operation, it is preferred that the electromagnets 13 with staggered tooth-shaped protrusions are arranged adjacent to the electromagnets 13 that are energized, so that different electromagnets 13 can be switched to be energized in sequence along the axial direction to achieve continuous translation of the mobile lens barrel assembly 9, which is specifically achieved by the following structure: the center distance between two adjacent electromagnets 13 is a non-integer multiple of the center distance between two adjacent first tooth-shaped protrusions 301.

[0032] In addition, in this embodiment, the multiple electromagnets 13 on the outer barrel 1 are connected in parallel, so that each electromagnet 13 can be controlled to be powered on or off respectively.

[0033] When the electromagnet 13 is energized, the second tooth-shaped protrusions 11 thereon are not necessarily all directly opposite to the first tooth-shaped protrusions 301, and only one or two of them may be directly opposite to each other. As long as there are first tooth-shaped protrusions 301 and second tooth-shaped protrusions 11 that are directly opposite to each other, the maximum magnetic flux can be achieved to ensure stable adsorption. In an optional embodiment, the number of second tooth-shaped protrusions 11 on each electromagnet 13 is an odd number, and when the electromagnet 13 is energized, the second tooth-shaped protrusion 11 located in the middle of the energized electromagnet 13 is directly opposite to the first tooth-shaped protrusion 301.

[0034] In the present invention, the electromagnets 13 can be arranged at intervals, and the number of the electromagnets 13 determines the number of times the movable barrel assembly 9 moves in a complete stroke. Therefore, the number of the electromagnets 13 has a moving requirement. If the electromagnets 13 are distributed too loosely, the axial length of the outer barrel 1 will increase. For this reason, it is preferred that each electromagnet 13 is arranged in sequence. In order to make the distribution of the tooth-like protrusions regular, it is preferred that the width of the first tooth-like protrusion 301 is equal to that of the second tooth-like protrusion 11. After a number of electromagnets 13 are connected in sequence, a plurality of second tooth-like protrusions 11 uniformly distributed along the axial direction are formed. Figure 2 As shown, the second tooth-shaped protrusions 11 on each electromagnet 13 have equal widths and equal intervals, and a space is formed at the junction of two electromagnets 13, so that all the electromagnets 13 form a whole line of uniformly distributed second tooth-shaped protrusions 11.

[0035] The endoscope generally includes a front lens barrel assembly 7 and a rear lens barrel assembly 8. Figure 1 and Figure 2As shown, the front lens barrel assembly 7 includes a front lens barrel 7-1 and a first lens 7-2 and a second lens 7-3 fixed in the front lens barrel 7-1, the rear lens barrel assembly 8 includes a rear lens barrel 8-1 and a third lens 8-2 fixed in the rear lens barrel 8-1, the front lens barrel 7-1 and the rear lens barrel 8-1 are respectively fixed at the front and rear ends of the outer lens barrel 1, and the distance between the front lens barrel 7-1 and the rear lens barrel 8-1 is the movement stroke of the movable lens barrel assembly 9.

[0036] Embodiment 2 In the above embodiment, when the electromagnets 13 are switched on in sequence in the same direction, the movement of the moving lens barrel assembly 9 in one direction is mainly realized. The movement distance is not limited. The different distribution modes of the first tooth-shaped protrusions 301 and the second tooth-shaped protrusions 11 will cause the movement distance to change. This embodiment aims to achieve equal movement distance each time, that is, to achieve step-by-step movement. The specific design idea is: let the number of electromagnets 13 be N, then the difference between the staggered distances between the second tooth-shaped protrusions 11 and the first tooth-shaped protrusions 301 of two adjacent electromagnets 13 is the center distance between the two adjacent first tooth-shaped protrusions 301. . Where N is a positive integer.

[0037] Embodiment 3 The difference between this embodiment and the first or second embodiment is that the electromagnets 13 on the outer barrel 1 are not completely connected in parallel, but are partially connected in parallel and partially in series. The specific design is as follows: one or more electromagnet groups 10 are fixed to the outer barrel 1 along the axial direction, and each electromagnet group 10 includes a plurality of electromagnets 13 arranged sequentially along the axial direction and connected in parallel with each other, and the electromagnets 13 in different electromagnet groups 10 are connected in series one by one.

[0038] Only one group of electromagnet groups 10 can be provided, that is, each electromagnet 13 is arranged in parallel. When multiple groups of electromagnet groups 10 are provided, the electromagnets 13 in the same group of electromagnet groups 10 are arranged in sequence. Providing multiple groups of electromagnet groups 10 can reduce the number of external circuits. For example, if two groups of electromagnet groups 10 are provided, the electromagnets 13 between the electromagnet groups 10 can be connected in series one by one. Therefore, with the same number of electromagnets 13, the number of external circuits can be reduced by half.

[0039] In order to avoid the influence of different directions of magnetic field force produced by the electromagnets 13 in different electromagnet groups 10 on the first tooth-shaped protrusion 301, the length of the movable lens barrel assembly 9 cannot be too long, and if the length of the movable lens barrel assembly 9 is too short, it will not be able to transition to the adjacent electromagnet group 10. For this reason, as preferably, the length of the movable lens barrel assembly 9 is greater than the total length of each electromagnet group, and the difference between the length of the movable lens barrel assembly 9 and the total length of an electromagnet group is less than half of the length of a single electromagnet 13, that is, the length of the magnetic attraction tooth plate 3 is slightly longer than the total length of an electromagnet group 10, but the redundant length does not exceed half of an electromagnet 13, when the movable lens barrel assembly 9 moves inside one of the electromagnet groups 10, the electromagnets 13 in other electromagnet groups 10 are far away from the movable lens barrel assembly 9, and the influence of the magnetic field force of the magnetic attraction tooth plate 3 is small and can be ignored. In this way, it is possible to avoid mutual interference between different electromagnet groups 10, and the movable lens barrel assembly 9 can be slowly transitioned to the direction of the adjacent electromagnet group 10. The first tooth-shaped protrusions 301 and the second tooth-shaped protrusions 11 cannot be arranged at equal intervals, and preferably the first tooth-shaped protrusions 301 are arranged densely. At this time, the first tooth-shaped protrusions 301 and the second tooth-shaped protrusions 11 can be reasonably arranged to make the movable lens barrel assembly 9 span across the two electromagnet groups 10, and the first tooth-shaped protrusions 301 can be simultaneously aligned with the second tooth-shaped protrusions 11 on the electromagnets 13 connected in series in the two electromagnet groups 10. In the present invention, the difference between the number of the first tooth-shaped protrusions 301 and the number of the second tooth-shaped protrusions 11 within the same axial length range is 1 to 2.

[0040] The zooming method using step zoom includes the following steps: S1: energize one of the electromagnets 13 so that the second tooth-shaped protrusion 11 on the electromagnet 13 faces the first tooth-shaped protrusion 301 .

[0041] S2: Switching the adjacent electromagnets 13 to be energized one by one, the second tooth-shaped protrusions 11 on the energized electromagnets 13 after switching are directly opposite to the first tooth-shaped protrusions 301, so that the movable lens barrel assembly 9 is offset, and the single offset is the distance between the centers of the two adjacent first tooth-shaped protrusions 301. When the electromagnet 13 in step S1 is energized again, the moving lens barrel assembly 9 moves a distance of one tooth. The distance of one tooth refers to the center distance between two adjacent first tooth-shaped protrusions 301.

[0042] The specific working process is described below in conjunction with specific embodiments: like Figure 2As shown, two groups of electromagnet groups 10 are installed on the outer lens barrel 1, and each group of electromagnet groups 10 is provided with three electromagnets 13 in sequence. The electromagnets 13 in each electromagnet group 10 are named as the first electromagnet group 10-1, the second electromagnet group 10-2 and the third electromagnet group 10-3 from left to right. The two first electromagnet groups 10-1 are connected in series, the two second electromagnet groups 10-2 are connected in series, and the two third electromagnet groups 10-3 are connected in series. The first electromagnet group 10-1, the second electromagnet group 10-2 and the third electromagnet group 10-3 are connected in parallel. The electromagnets 13 in series are energized at the same time, and the electromagnets 13 in parallel can be energized separately. Three second tooth-shaped protrusions 11 are arranged on each electromagnet 13, and nine second tooth-shaped protrusions 11 are arranged at equal intervals on the three electromagnets 13. Eleven first tooth-shaped protrusions 301 are arranged at equal intervals on the magnet tooth plate.

[0043] The step-by-step movement process is as follows: like Figure 3 As shown, the movable lens barrel assembly 9 is located at the leftmost end, within the magnetic field range of the left electromagnet group 10, and the first electromagnet group 10-1 is energized, and the first electromagnet group 10-1 and the movable lens barrel assembly 9 attract each other, and the magnetic flux at the tooth-shaped protrusion is the largest, so the tooth-shaped protrusions of the two are close to each other and reach a balance, specifically referring to the middle second tooth-shaped protrusion 11 of the first electromagnet group 10-1 of the left electromagnet group 10 and the first tooth-shaped protrusion 301 are directly opposite, and the following are all the same, it should be noted that the first electromagnet group 10-1 and the second electromagnet group 10-2 in the two electromagnet groups 10 are both passed with currents of equal magnitude, but the right electromagnet group 10 is far away from the magnetic suction tooth plate 3, and the magnetic field force formed is weak and can be ignored. At this time, the first tooth-shaped protrusion 301 of the movable lens barrel assembly 9 is staggered by 1 / 3 of a tooth from the second tooth-shaped protrusion 11 on the second electromagnet group 10-2 of the left electromagnet group. The 1 / 3 tooth refers to 1 / 3 of the center distance between two adjacent first tooth-shaped protrusions 301 .

[0044] like Figure 4 As shown, when the mobile lens barrel assembly 9 is to be moved, the second electromagnet group 10-2 is energized, and the current on the first electromagnet group 10-1 is disconnected, the second electromagnet group 10-2 and the mobile lens barrel assembly 9 attract each other, because the second electromagnet group 10-2 is staggered with the first tooth-shaped protrusion 301 before being energized, the tooth-shaped protrusions of the two are close to each other under the action of magnetic force, and the mobile lens barrel assembly 9 is displaced, so that the first tooth-shaped protrusion 301 of the mobile lens barrel assembly 9 is directly opposite to the second tooth-shaped protrusion 11 on the second electromagnet group 10-2. At this time, the first tooth-shaped protrusion 301 of the mobile lens barrel assembly 9 is staggered by the position of 1 / 3 tooth with the second tooth-shaped protrusion 11 on the third electromagnet group 10-3 of the left electromagnet group.

[0045] like Figure 5As shown, then the third electromagnet group 10-3 is energized, and the current on the second electromagnet group 10-2 is disconnected, the third electromagnet group 10-3 and the mobile lens barrel assembly 9 attract each other, because the third electromagnet group 10-3 is staggered with the first tooth-shaped protrusion 301 before being energized, the tooth-shaped protrusions of the two are close to each other under the action of magnetic force, and the mobile lens barrel assembly 9 is displaced, so that the first tooth-shaped protrusion 301 of the mobile lens barrel assembly 9 is directly opposite to the second tooth-shaped protrusion 11 on the third electromagnet group 10-3. At this time, the first tooth-shaped protrusion 301 of the mobile lens barrel assembly 9 and the second tooth-shaped protrusion 11 on the first electromagnet group 10-1 of the left and right electromagnet groups are all staggered by 1 / 3 of a tooth.

[0046] like Figure 6 As shown, the first electromagnet group 10-1 is then energized again, and the current on the third electromagnet group 10-3 is disconnected, the first electromagnet group 10-1 and the movable lens barrel assembly 9 attract each other, and under the action of the magnetic force, the tooth-like protrusions of the two are close to each other, and the movable lens barrel assembly 9 is displaced, so that the movable lens barrel assembly 9 is directly opposite to the second tooth-like protrusions 11 on the first electromagnet group 10-1 of the left and right electromagnetic groups.

[0047] Under the above-mentioned moving arrangements, the movable lens barrel assembly 9 moves the distance of one tooth in the outer lens barrel 1. Repeating this power-on sequence can drive the movable lens barrel assembly 9 to move continuously; the power-on sequence is changed from 10-1→10-2→10-3→… to 10-1→10-3→10-2→…, which can control the movable lens barrel assembly 9 to move in the opposite direction.

[0048] In the description of the present invention, it is necessary to understand that the terms "length", "left", "right", "inside", "outside", "axial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0050] In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments.

[0051] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A high-precision translation endoscope zoom structure, characterized in that: It comprises an outer lens barrel (1) and a movable lens barrel assembly (9) located inside the outer lens barrel (1); The outer lens barrel (1) is axially fixed with a plurality of electromagnets (13), and the movable lens barrel assembly (9) is circumferentially fixed to the outer lens barrel (1); The movable lens barrel assembly (9) has a plurality of first tooth-shaped protrusions (301) arranged along the axial direction and extending toward the electromagnet (13); the first tooth-shaped protrusions (301) are made of a magnetic conductor; a surface of each electromagnet (13) facing the movable lens barrel assembly (9) has a plurality of second tooth-shaped protrusions (11); when the electromagnet (13) is energized, the second tooth-shaped protrusions (11) on the energized electromagnet (13) are directly opposite to the first tooth-shaped protrusions (301); and when the second tooth-shaped protrusions (11) of one of the electromagnets (13) are directly opposite to the first tooth-shaped protrusions (301), the second tooth-shaped protrusions (11) of at least one of the remaining electromagnets (13) are staggered from the first tooth-shaped protrusions (301).

2. The high-precision translation endoscope zoom structure according to claim 1, characterized in that: The outer lens barrel (1) is fixed with one or more electromagnet groups (10) along the axial direction, each electromagnet group (10) comprising a plurality of electromagnets (13) arranged in sequence along the axial direction and connected in parallel with each other, and the electromagnets (13) in different electromagnet groups (10) are connected in series one by one.

3. The high-precision translation endoscope zoom structure according to claim 1, characterized in that: The movable lens barrel assembly (9) comprises an inner lens barrel (2) and a movable lens (4) which are fixed to each other, and the first tooth-shaped protrusion (301) is located on the surface of the inner lens barrel (2).

4. The high-precision translation endoscope zoom structure according to claim 3 is characterized in that: The inner lens barrel (2) and the outer lens barrel (1) have mutually parallel planar portions (12), the electromagnet (13) is mounted on the planar portion (12) of the outer lens barrel (1), and a magnetic tooth plate (3) with a first tooth-shaped protrusion (301) is mounted on the planar portion (12) of the inner lens barrel (2).

5. The high-precision translation endoscope zoom structure according to claim 1, characterized in that: The center distance between two adjacent electromagnets (13) is a non-integer multiple of the center distance between two adjacent first tooth-shaped protrusions (301).

6. The high-precision translation endoscope zoom structure according to claim 5, characterized in that: Assuming that the number of electromagnets (13) is N, the difference in the offset distance between the second tooth-shaped protrusions (11) and the first tooth-shaped protrusions (301) of two adjacent electromagnets (13) is equal to the center distance between the two adjacent first tooth-shaped protrusions (301). , where N is a positive integer.

7. The high-precision translation endoscope zoom structure according to claim 6, characterized in that: The number of the second tooth-shaped protrusions (11) on each electromagnet (13) is an odd number, and when the electromagnet (13) is energized, the second tooth-shaped protrusion (11) located in the middle of the energized electromagnet (13) is directly opposite to the first tooth-shaped protrusion (301).

8. The high-precision translation endoscope zoom structure according to claim 6, characterized in that: The first tooth-shaped protrusion (301) and the second tooth-shaped protrusion (11) have the same width, and a plurality of electromagnets (13) are connected in sequence to form a plurality of second tooth-shaped protrusions (11) evenly distributed along the axial direction.

9. The high-precision translation endoscope zoom structure according to claim 8, characterized in that: The difference between the number of the first tooth-shaped protrusions (301) and the number of the second tooth-shaped protrusions (11) within the same axial length range is 1-2, the length of the movable lens barrel assembly (9) is greater than the total length of each electromagnetic group, and the difference between the length of the movable lens barrel assembly (9) and the total length of an electromagnetic group is less than half the length of a single electromagnet (13).

10. A step zoom method, characterized in that: The method adopts the high-precision translational endoscope zoom structure according to any one of claims 1 to 8, and comprises the following steps: S1: energizing one of the electromagnets (13) so that the second tooth-shaped protrusion (11) on the electromagnet (13) is aligned with the first tooth-shaped protrusion (301); S2: Switching the adjacent electromagnets (13) to be energized one by one in turn, the movable lens barrel assembly (9) is offset so that the second tooth-shaped protrusion (11) on the electromagnet (13) energized after switching is directly opposite to the first tooth-shaped protrusion (301), and when the electromagnet (13) in step S1 is energized again, the movable lens barrel assembly (9) moves a distance of one tooth.

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