Rotary endoscope zooming structure easy to operate and stepping zooming method

Abstract

The invention discloses a rotary endoscope zooming structure easy to operate and a stepping zooming method. The rotary endoscope zooming structure comprises an outer lens barrel, a movable inner barrel and a movable lens barrel assembly. And the movable inner cylinder is made of a magnetizer. The electromagnetic induction section is provided with a plurality of first tooth-shaped protrusions arranged circumferentially, the surface, facing the movable inner cylinder, of each electromagnet is provided with a plurality of second tooth-shaped protrusions arranged at equal intervals with the first tooth-shaped protrusions, and when the electromagnets are powered on, the second tooth-shaped protrusions on the powered-on electromagnets right 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, the rotation of the movable inner barrel 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 barrel, so that accurate regulation and control are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to an easy-to-operate rotary 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 electric drive elements are arranged along the movement direction of the movable lens, so the axial length of the outer lens barrel must be greater than the axial length of the movable lens, which leads to an increase in the overall axial length of the endoscope, making it difficult to achieve a miniaturized design of the endoscope; Second, the above zoom structures all control the movement of the movable lens by adjusting the current of the electromagnet, which requires designing an accurate algorithm according to actual needs to achieve precise control of the displacement of the movable lens, so the control program is relatively complex and the control accuracy is also low.

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

[0005] In order to solve the technical problems of slow response speed, complex control procedure and low control accuracy of the endoscope zoom structure in the prior art, the present invention provides an easy-to-operate rotary endoscope zoom structure and a step-by-step zoom method to solve the above problems.

[0006] The present invention provides an easy-to-operate rotary endoscope zoom structure, comprising an outer lens barrel, a movable inner lens barrel located inside the outer lens barrel, and a movable lens barrel assembly located inside the movable inner lens barrel; the movable lens barrel assembly comprises an inner lens barrel and a movable lens fixed to each other; the movable inner lens barrel is made of a magnetic conductor.

[0007] A plurality of electromagnets are fixed on the circumferential surface of the outer lens barrel. The movable inner lens barrel comprises an electromagnetic induction section and a motion conversion section. The motion conversion section converts the rotational motion of the movable inner lens barrel into axial motion along the outer lens barrel. The movable lens barrel assembly can reciprocate axially with the movable inner lens barrel.

[0008] The electromagnetic induction section has a plurality of first tooth-like protrusions arranged circumferentially, and the surface of each electromagnet facing the movable inner cylinder has a plurality of second tooth-like protrusions arranged at equal intervals with the first tooth-like protrusions. When the electromagnet is energized, the second tooth-like protrusions on the energized electromagnet are directly opposite to the first tooth-like protrusions, and when the second tooth-like protrusion of one of the electromagnets is directly opposite to the first tooth-like protrusion, the second tooth-like protrusion of at least one of the remaining electromagnets is staggered with the first tooth-like protrusion.

[0009] In an optional embodiment of the present invention, the movable lens barrel assembly can rotate relative to the movable inner barrel, so that the movable lens barrel assembly can only perform translational movement.

[0010] In an optional embodiment of the present invention, the movable lens barrel assembly further comprises a plurality of magnets fixed to the outer peripheral surface of the inner lens barrel, and the magnets are directly opposite to the electromagnets one by one.

[0011] In an optional embodiment of the present invention, the end of the electromagnetic induction section of the movable inner cylinder has a convex shoulder protruding radially inward, and the inner lens cylinder is adsorbed on the convex shoulder under the action of a magnet.

[0012] In an optional embodiment of the present invention, the inner circumferential surface of the outer lens barrel has a spiral groove, and the motion conversion section is provided with a ball that cooperates with the spiral groove.

[0013] In an optional embodiment of the present invention, the central circumferential angle of two adjacent electromagnets is a non-integer multiple of the central circumferential angle of two adjacent first tooth-shaped protrusions.

[0014] In an optional embodiment of the present invention, the electromagnet includes an iron core and a coil wound around the iron core, and the central axis of the coil is perpendicular to the central axis of the outer lens barrel.

[0015] In an optional embodiment of the present invention, the circumferential surface of the outer barrel has a through hole for fixing the iron core.

[0016] In an optional embodiment of the present invention, let the number of electromagnets be N, then in the rotation direction of the moving inner cylinder, the difference between the staggered angles of the second tooth-shaped protrusions and the first tooth-shaped protrusions of two adjacent electromagnets is equal to the circumferential angle of the two adjacent first tooth-shaped protrusions. .

[0017] The present invention also proposes a step-by-step zoom method, which adopts the above-mentioned easy-to-operate rotary endoscope zoom structure and includes the following steps: S1: energize one of the electromagnets so that the second tooth-shaped protrusion on the electromagnet is directly opposite to the first tooth-shaped protrusion.

[0018] S2: Switching the adjacent electromagnets to be energized one by one in turn, the mobile inner cylinder rotates, so that the second tooth-shaped protrusion on the electromagnet energized after switching is directly opposite to the first tooth-shaped protrusion; when the electromagnet in step S1 is energized again, the mobile inner cylinder rotates one circle.

[0019] The beneficial effects of the present invention are: (1) The present invention realizes the rotation of the mobile inner cylinder 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 mobile barrel, thereby achieving precise control.

[0020] (2) The present invention uses magnetic adsorption to fix the inner lens barrel at one end of the movable lens barrel, and the inner lens barrel will not rotate with the movable lens barrel. The movable lens only needs to perform translational motion, thereby ensuring the stability of the lens during zooming. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is an exploded view of a specific embodiment of the easy-to-operate rotary endoscope zoom structure of the present invention; Figure 2 is an axial cross-sectional view of a specific embodiment of the easy-to-operate rotary endoscope zoom structure of the present invention; Figure 3 It is a schematic diagram of the matching relationship between the movable inner cylinder and the electromagnet in the present invention.

[0023] In the figure, 1, outer lens barrel, 101, through hole, 2, movable inner barrel, 201, boss, 202, motion conversion section, 203, electromagnetic induction section, 3, guide rail sleeve, 301, spiral groove, 4, coil, 4-1, first coil, 4-2, second coil, 4-3, third coil, 5, iron core, 5-1, first iron core, 5-2, second iron core, 5-3, third iron core, 6, ball, 7, inner lens barrel, 8, magnet, 9, movable lens, 10, movable lens barrel assembly, 11, electromagnet, 12, first tooth-shaped protrusion, 13, second tooth-shaped protrusion. DETAILED DESCRIPTION

[0024] 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.

[0025] Embodiment 1 like Figure 1-Figure 3As shown, an easy-to-operate rotary endoscope zoom structure includes an outer lens barrel 1, a movable inner lens barrel 2 located in the outer lens barrel 1, and a movable lens barrel assembly 10 located in the movable inner lens barrel 2; the movable lens barrel assembly 10 includes an inner lens barrel 7 and a movable lens 9 fixed to each other; the movable inner lens barrel 2 is made of a magnetic conductor.

[0026] A number of electromagnets 11 are fixed on the circumferential surface of the outer barrel 1, and the movable inner barrel 2 includes an electromagnetic induction section 203 and a motion conversion section 202. The electromagnetic induction section 203 interacts with the electromagnet 11, and the motion conversion section 202 interacts with the outer barrel 1. The motion conversion section 202 converts the rotational motion of the movable inner barrel 2 into axial motion along the outer barrel 1; the movable barrel assembly 10 can reciprocate along the axial direction with the movable inner barrel 2.

[0027] The electromagnetic induction section 203 has a plurality of first tooth-like protrusions 12 arranged circumferentially, preferably arranged in a circumferential array, and the surface of each electromagnet 11 facing the movable inner cylinder 2 has a plurality of second tooth-like protrusions 13 arranged at equal intervals from the first tooth-like protrusions 12. When the electromagnet 11 is energized, the second tooth-like protrusions 13 on the energized electromagnet 11 are directly opposite to the first tooth-like protrusions 12, and when the second tooth-like protrusions 13 of one of the electromagnets 11 are directly opposite to the first tooth-like protrusions 12, the second tooth-like protrusions 13 of at least one of the remaining electromagnets 11 are staggered with the first tooth-like protrusions 12, and the staggered means that the protruding parts of the second tooth-like protrusions 13 and the first tooth-like protrusions 12 are not exactly opposite.

[0028] The outer lens barrel 1, the movable inner barrel 2 and the inner lens barrel 7 are all cylindrical structures, and the diameters gradually decrease. The movable inner barrel 2 is a transition component between the outer lens barrel 1 and the inner lens barrel 7. Since the movable inner barrel 2 is made of magnetic conductive material, when the electromagnet 11 is energized, the movable inner barrel 2 will be subjected to electromagnetic force, and the magnetic flux at the tooth-shaped protrusion is the largest, so the first tooth-shaped protrusion 12 of the movable inner barrel 2 and the second tooth-shaped protrusion 13 of the electromagnet 11 will be close to each other, and since the second tooth-shaped protrusion 13 on other individual or all electromagnets 11 is misaligned with the first tooth-shaped protrusion 12, when the electromagnet 11 with misalignment is energized, the movable inner barrel 2 will rotate, and under the action of the motion conversion section 202, the movable inner barrel 2 will generate axial movement while rotating, thereby driving the movable lens barrel assembly 10 to move and realize zooming. The denser the first tooth-shaped protrusions 12 are arranged, the smaller the angle of a single rotation of the movable inner barrel 2 is, and the higher the zooming accuracy is.

[0029] The present invention can realize zooming only by switching different electromagnets 11 to be energized, and does not need to adjust the current of the electromagnet 11. Therefore, compared with the traditional zoom structure, the control program of the present invention is simpler. In addition, since the traditional zoom structure controls the moving distance by changing the current, the stability of the moving lens 9 is low, and since the amplitude of the current change cannot be too small, the minimum moving distance of the moving lens 9 cannot be too small, which leads to reduced zoom accuracy. In the present invention, the minimum moving distance of the moving lens barrel assembly 10 is related to the distribution density of the tooth-like protrusions, and the zoom accuracy can be improved by increasing the distribution density of the tooth-like protrusions without affecting the stability of the moving lens 9.

[0030] The electromagnet 11 generally includes an iron core 5 and a coil 4 wound on the iron core 5, wherein the central axis of the coil 4 is perpendicular to the central axis of the outer lens barrel 1. When the coil 4 is energized, an induced current is generated, and the iron core 5 generates an induced magnetic field tangent to the surface of the moving inner barrel 2, driving the moving inner barrel 2 to rotate. The circumferential surface of the outer lens barrel 1 has a through hole 101 for fixing the iron core 5, and the electromagnet 11 can be fixed by gluing.

[0031] For the assembly of the moving lens barrel assembly 10: The movable lens barrel assembly 10 can rotate and translate synchronously with the movable inner barrel 2, but too many forms of movement can easily cause the movable lens 9 to shake. For this reason, in a preferred embodiment, the movable lens barrel assembly 10 can rotate relative to the movable inner barrel 2, so that the movable lens barrel assembly 10 only performs translational movement. For example, a circumferential limiting structure can be used for limiting. At this time, the movable lens barrel assembly 10 needs to be matched with the remaining fixed components. The present invention adopts the following structure: the movable lens barrel assembly 10 also includes a plurality of magnets 8 fixed to the outer peripheral surface of the inner barrel 7, and the magnets 8 are opposite to the electromagnets 11 one by one. When the electromagnets 11 are energized, the magnets 8 opposite to them can be attracted. Since the magnets 8 are opposite to the electromagnets 11 one by one, no matter which electromagnet 11 is energized, the magnets 8 opposite to them can be attracted. In this way, the rotation of the movable lens barrel assembly 10 can be suppressed. The axial fixation of the movable lens barrel assembly 10 relative to the movable inner barrel 2 can be achieved by setting an annular groove on the inner surface of the movable inner barrel 2. The present invention can also be achieved by magnets 8, such as Figure 2 As shown, the end of the electromagnetic induction section 203 of the moving inner cylinder 2 has a radially inwardly protruding shoulder 201, and the inner lens barrel 7 is adsorbed on the shoulder 201 under the action of the magnet 8. Since the moving inner cylinder 2 is made of magnetic conductive material, the shoulder 201 can be adsorbed with the magnet 8, so that the moving lens barrel assembly 10 is always located at the right end of the moving inner cylinder 2. Balls 6 can also be added between the moving inner cylinder 2 and the moving lens barrel assembly 10 to reduce friction.

[0032] Regarding the matching structure between the motion conversion section 202 of the mobile inner barrel 2 and the outer lens barrel 1: The inner circumference of the outer lens barrel 1 has a spiral groove 301, and the motion conversion section 202 is provided with a ball 6 that cooperates with the spiral groove 301. Figure 1 As shown, the motion conversion section 202 is located at the left end of the moving inner cylinder 2, the electromagnetic induction section 203 is located at the right end of the moving inner cylinder 2, the outer circumferential surface of the electromagnetic induction section 203 is evenly arranged with first tooth-shaped protrusions 12, the outer circumferential surface of the motion conversion section 202 is provided with a groove for accommodating the ball 6, the left half of the inner circumferential surface of the outer lens barrel 1 is fixed with a guide sleeve 3, the spiral groove 301 is provided on the guide sleeve 3, the guide sleeve 3 and the outer lens barrel 1 are made separately, the spiral groove 301 can penetrate the surface of the guide sleeve 3, and the processing difficulty of the spiral groove 301 can be reduced.

[0033] In the present invention, when one of the electromagnets 11 is energized, only the second tooth-shaped protrusions 13 of some other electromagnets 11 may be staggered with the first tooth-shaped protrusions 12, and the electromagnets 11 with staggered tooth-shaped protrusions may be at any position in the circumferential direction, and the electromagnets 11 with staggered tooth-shaped protrusions may be switched to be energized when rotation is required. For the convenience of operation, the electromagnets 11 with staggered tooth-shaped protrusions are preferably arranged adjacent to the electromagnets 11 with energization, so that the electromagnets 11 can be switched to be energized in sequence along the circumferential direction to realize the continuous rotation of the moving inner cylinder 2, which is specifically realized by the following structure: the central circumferential angle of two adjacent electromagnets 11 is a non-integer multiple of the central circumferential angle of two adjacent first tooth-shaped protrusions 12. In addition, when two electromagnets 11 are provided in the same radial direction, the two electromagnets 11 may also be turned on at the same time to increase the driving force.

[0034] In a further design, let the number of electromagnets 11 be N, then in the rotation direction of the moving inner cylinder 2, the difference between the staggered angles of the second tooth-shaped protrusions 13 and the first tooth-shaped protrusions 12 of two adjacent electromagnets 11 is equal to the circumferential angle of the two adjacent first tooth-shaped protrusions 12 , so that the angle of each rotation of the moving inner cylinder 2 is equal, thereby realizing the step-by-step movement of the moving lens barrel assembly 10. The specific zooming method includes the following steps: S1: energize one of the electromagnets 11 so that the second tooth-shaped protrusion 13 on the electromagnet 11 is directly opposite to the first tooth-shaped protrusion 12 .

[0035] S2: Switching the adjacent electromagnets 11 to be energized one by one in turn, the mobile inner cylinder 2 rotates, so that the second tooth-shaped protrusion 13 on the electromagnet 11 that is energized after switching is directly opposite to the first tooth-shaped protrusion 12; when the electromagnet 11 in step S1 is energized again, the mobile inner cylinder 2 rotates one circle.

[0036] The process of step-by-step zooming is described below in conjunction with a specific embodiment: like Figure 3As shown, three electromagnets 11 are evenly distributed on the outer lens barrel 1 in a circumferential manner, and the movable inner barrel 2 is inside the outer lens barrel 1. The iron cores 5 of the three electromagnets 11 are respectively the first iron core 5-1, the second iron core 5-2, and the third iron core 5-3, and the corresponding coils 4 are respectively the first coil 4-1, the second coil 4-2, and the third coil 4-3. There are three second tooth-like protrusions 13 on the iron core 5 of the electromagnet 11, facing inwardly toward the central axis, and there are twenty-five first tooth-like protrusions 12 on the outer side of the movable inner barrel 2; the circumferential angles of the adjacent tooth-like protrusions on the iron core 5 and the movable inner barrel 2 are different.

[0037] The working process is as follows: like Figure 3 , the first coil 4-1 is energized, the first iron core 5-1 and the moving inner cylinder 2 attract each other, and since the magnetic flux is the largest at the tooth-shaped protrusions, the second tooth-shaped protrusions 13 on the first iron core 5-1 are close to the first tooth-shaped protrusions 12. At this time, the first tooth-shaped protrusions 12 on the moving inner cylinder 2 closest to the second iron core 5-2 are staggered by 1 / 3 teeth, and the 1 / 3 teeth refer to 1 / 3 of the circumferential angle formed by the centers of two adjacent first tooth-shaped protrusions 12.

[0038] When it is to rotate, the second coil 4-2 is energized and the current on the first coil 4-1 is disconnected, the second core 5-2 and the moving inner cylinder 2 attract each other, and because the first tooth-shaped protrusion 12 of the moving inner cylinder 2 and the second tooth-shaped protrusion 13 on the second core 5-2 are staggered before adsorption, the tooth-shaped protrusions of the two are close to each other under the action of magnetic force, and the moving inner cylinder 2 rotates, so that the tooth-shaped protrusions of the moving inner cylinder 2 and the second core 5-2 are opposite to each other. At this time, the first tooth-shaped protrusion 12 on the moving inner cylinder 2 closest to the third core 5-3 is staggered by 1 / 3 tooth with the second tooth-shaped protrusion 13 on the third core 5-3.

[0039] Then, the third coil 4-3 is energized, and the current on the third coil 4-3 is disconnected, and the third iron core 5-3 and the moving inner cylinder 2 attract each other. At this time, due to the magnetic force, the tooth-shaped protrusions of the moving inner cylinder 2 and the third iron core 5-3 approach each other, and the moving inner cylinder 2 rotates, so that the tooth-shaped protrusions of the moving inner cylinder 2 and the third iron core 5-3 are opposite to each other. At this time, the first tooth-shaped protrusion 12 on the moving inner cylinder 2 closest to the first iron core 5-1 is staggered by 1 / 3 of a tooth from the second tooth-shaped protrusion 13 on the first iron core 5-1.

[0040] Then, the first coil 4-1 is energized, and the current on the third coil 4-3 is disconnected. The first iron core 5-1 and the movable inner cylinder 2 attract each other. Under the action of magnetic force, the movable inner cylinder 2 and the tooth-like protrusions of the first iron core 5-1 approach each other, and the movable inner cylinder 2 rotates, so that the tooth-like protrusions of the movable inner cylinder 2 and the third iron core 5-3 are opposite to each other.

[0041] In this way, the moving inner cylinder 2 rotates within the outer lens cylinder 1 by an angle of one tooth. Repeating this power-on sequence can drive the moving inner cylinder 2 to rotate continuously. Changing the power-on sequence from clockwise to counterclockwise can control the moving inner cylinder 2 to rotate in the opposite direction.

[0042] The first tooth-shaped protrusion 12 outside the movable inner cylinder 2 may also be provided with other numbers of teeth, and accordingly, the circumferential angle of the adjacent second tooth-shaped protrusion 13 on the iron core 5 needs to be adjusted so that each step rotates by 1 / 3 tooth.

[0043] The present invention can also increase the number of electromagnets 11 to four, five or more, and only needs to adjust the angle of each step of rotation to 1 / N teeth (N is the number of electromagnets 11). The number of electromagnets 11 can also be increased in multiples, such as from three to six, and each time two opposing electromagnets 11 are energized to increase the driving force.

[0044] In the description of the present invention, it is necessary to understand that the terms "center", "left", "right", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the 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.

[0045] In addition, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. 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. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0046] 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.

[0047] 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. An easy-to-operate rotary endoscope zoom structure, characterized in that: The invention comprises an outer lens barrel (1), a movable inner barrel (2) located in the outer lens barrel (1), and a movable lens barrel assembly (10) located in the movable inner barrel (2); the movable lens barrel assembly (10) comprises an inner lens barrel (7) and a movable lens (9) fixed to each other; the movable inner barrel (2) is made of a magnetic conductor; A plurality of electromagnets (11) are fixed on the circumferential surface of the outer lens barrel (1); the movable inner barrel (2) comprises an electromagnetic induction section (203) and a motion conversion section (202); the motion conversion section (202) converts the rotational motion of the movable inner barrel (2) into axial motion along the outer lens barrel (1); the movable lens barrel assembly (10) is capable of axially reciprocating motion along with the movable inner barrel (2); The electromagnetic induction section (203) has a plurality of first tooth-shaped protrusions (12) arranged circumferentially, and a surface of each electromagnet (11) facing the movable inner cylinder (2) has a plurality of second tooth-shaped protrusions (13) arranged at equal intervals from the first tooth-shaped protrusions (12); when the electromagnet (11) is energized, the second tooth-shaped protrusions (13) on the energized electromagnet (11) are directly opposite to the first tooth-shaped protrusions (12), and when the second tooth-shaped protrusions (13) of one of the electromagnets (11) are directly opposite to the first tooth-shaped protrusions (12), the second tooth-shaped protrusions (13) of at least one of the remaining electromagnets (11) are staggered from the first tooth-shaped protrusions (12).

2. The easy-to-operate rotary endoscope zoom structure according to claim 1 is characterized in that: The movable lens barrel assembly (10) can rotate relative to the movable inner barrel (2), so that the movable lens barrel assembly (10) can only perform translational movement.

3. The easy-to-operate rotary endoscope zoom structure according to claim 2, characterized in that: The movable lens barrel assembly (10) further comprises a plurality of magnets (8) fixed to the outer peripheral surface of the inner lens barrel (7), wherein the magnets (8) are directly opposite to the electromagnets (11) one by one.

4. The easy-to-operate rotary endoscope zoom structure according to claim 3 is characterized in that: The end of the electromagnetic induction section (203) of the movable inner cylinder (2) has a convex shoulder (201) protruding radially inward, and the inner lens cylinder (7) is adsorbed on the convex shoulder (201) under the action of the magnet (8).

5. The easy-to-operate rotary endoscope zoom structure according to claim 1, characterized in that: The inner circumferential surface of the outer lens barrel (1) is provided with a spiral groove (301), and the motion conversion section (202) is provided with a ball (6) that cooperates with the spiral groove (301).

6. The easy-to-operate rotary endoscope zoom structure according to claim 1, characterized in that: The central circumferential angle of two adjacent electromagnets (11) is a non-integer multiple of the central circumferential angle of two adjacent first tooth-shaped protrusions (12).

7. The easy-to-operate rotary endoscope zoom structure according to claim 1, characterized in that: The electromagnet (11) comprises an iron core (5) and a coil (4) wound around the iron core (5), wherein the central axis of the coil (4) is perpendicular to the central axis of the outer lens barrel (1).

8. The easy-to-operate rotary endoscope zoom structure according to claim 7, characterized in that: The circumferential surface of the outer lens barrel (1) has a through hole (101) for fixing the iron core (5).

9. The easy-to-operate rotary endoscope zoom structure according to claim 6, characterized in that: Assuming that the number of the electromagnets (11) is N, then in the rotation direction of the movable inner cylinder (2), the difference between the staggered angles of the second tooth-shaped protrusions (13) and the first tooth-shaped protrusions (12) of two adjacent electromagnets (11) is equal to the circumferential angle of the two adjacent first tooth-shaped protrusions (12). .

10. A step zoom method, characterized in that: The method adopts the easy-to-operate rotary endoscope zoom structure according to any one of claims 1 to 9, and comprises the following steps: S1: energizing one of the electromagnets (11) so that the second tooth-shaped protrusion (13) on the electromagnet (11) is aligned with the first tooth-shaped protrusion (12); S2: Switching the adjacent electromagnets (11) to be energized one by one in turn, causing the moving inner cylinder (2) to rotate, so that the second tooth-shaped protrusion (13) on the electromagnet (11) that is energized after switching is directly opposite to the first tooth-shaped protrusion (12); when the electromagnet (11) in step S1 is energized again, the moving inner cylinder (2) rotates one circle.

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