Linear Ampere force balance zooming endoscope zooming structure and zooming method

Abstract

The invention discloses a linear Ampere force balance zoom endoscope zoom structure and a zoom method.The linear Ampere force balance zoom endoscope zoom structure comprises an outer lens cone, an inner lens cone and a movable lens, a plurality of magnets are fixed to the outer peripheral face of the inner lens cone, one or more coil sets are wound around the outer peripheral face of the outer lens cone, and the movable lens is fixed to the outer peripheral face of the outer lens cone. Each coil group comprises a plurality of single coils arranged along the axial direction of the outer lens barrel, each single coil in the same coil group is independently connected with an external circuit, the single coils in different coil groups are connected in series in a one-to-one correspondence manner, and when the movable lens is in a balanced state, the single coils conducted in each coil group have currents in opposite directions. And the length of the magnet along the axial direction of the outer lens barrel is smaller than or equal to the maximum distance between the conducted single coils. By controlling the current directions of different single coils, the magnet achieves Ampere force balance at different positions, the magnet can be stabilized at the balance position as long as the current of the single coils is stable, the structure is simple, the safety is high, and the positioning precision is high.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an endoscope zoom structure and a zoom method for linear Ampere force balanced zoom. 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 electric drive methods used in the prior art to adjust the movable lens, but most of them are driven by electromagnets. One solution is to arrange the electromagnets on both sides of the movable lens, such as the zoom structure disclosed in Patent No. CN111897086A. The displacement of the movable lens is controlled by adjusting the current of the two electromagnets. This solution is difficult to control the movable lens. A slight change in current will cause the movable lens to shake, and the visual effect is poor when the medical staff operates. Another solution is to embed the electromagnet on the outer lens barrel, such as the zoom structure disclosed in Patent No. CN115670350A. In this case, the cooperation of the spring is required to balance the electromagnetic force and the elastic force to make the movable lens reach a stable state. This structure has many parts and components, and the assembly difficulty and production cost are relatively large.

[0004] In addition, in the prior art, the electrically driven endoscope zoom structure is located inside the lens barrel to connect to the external circuit, which makes it difficult to connect wires and also poses a safety hazard.

[0005] Therefore, it is necessary to design an endoscope zoom structure which has high safety, simple structure and can be precisely positioned. Summary of the invention

[0006] In order to solve the technical problems of complex structure, low positioning accuracy and low safety of the endoscope zoom structure in the prior art, the present invention provides an endoscope zoom structure and zoom method with linear Ampere force balanced zoom to solve the above problems.

[0007] The technical solution adopted by the present invention to solve its technical problems is: an endoscope zoom structure with linear Ampere force balanced zoom, comprising an outer barrel, an inner barrel located inside the outer barrel and a movable lens moving synchronously with the inner barrel, a plurality of magnets are fixed to the outer circumference of the inner barrel, one or more coil groups are wound around the outer circumference of the outer barrel, each of the coil groups comprises a plurality of single coils arranged along the axial direction of the outer barrel, each single coil in the same coil group is independently connected to an external circuit, and the single coils in different coil groups are connected in series one by one, when the movable lens is in a balanced state, the single coils that are turned on in each of the coil groups have currents in opposite directions, and the length of the magnet along the axial direction of the outer barrel is less than or equal to the maximum distance between the turned-on single coils.

[0008] In an optional embodiment of the present invention, when the movable lens is in a balanced state, the circuit containing only two single coils in each coil group is turned on, and the current directions are opposite, and the length of the magnet along the axial direction of the outer lens barrel is less than or equal to the distance between the two single coils.

[0009] In an optional implementation manner of the present invention, three or more single coils are provided in each coil group.

[0010] In an optional implementation manner of the present invention, two single coils in the circuit in which the circuit is conducted are adjacent to each other or separated by a single coil.

[0011] In an optional embodiment of the present invention, the width of each single coil is equal. The length of the magnet along the axial direction of the outer barrel is less than or equal to the sum of the widths of the two single coils.

[0012] In an optional embodiment of the present invention, when the moving lens is in a balanced state, two single coils with currents in opposite directions generate Ampere forces in opposite directions on the magnet.

[0013] In an optional implementation manner of the present invention, the inner lens barrel is made of weak magnetic material.

[0014] In an optional embodiment of the present invention, a front lens barrel assembly and a rear lens barrel assembly fixed to the outer lens barrel are further included, and the outer diameter of each of the single coils is equal to the outer diameter of the front lens barrel assembly and the rear lens barrel assembly.

[0015] In an optional embodiment of the present invention, the outer lens barrel includes a barrel body and shoulders located at one or both ends of the barrel body and protruding radially outward, the coil group abuts against one of the shoulders, and the outer diameter of the shoulder is equal to the outer diameter of the coil group.

[0016] In an optional embodiment of the present invention, the outer circumference of the inner lens barrel has a plurality of mounting grooves for accommodating magnets.

[0017] The present invention provides a zoom method, which adopts the above-mentioned linear Ampere force balance zoom endoscope zoom structure and comprises the following steps: S11: setting an initial equilibrium state, wherein the magnet maintains equilibrium under the action of two single coils in the same coil group with currents flowing in opposite directions; S12: Select the two single coils that need to be energized in the end according to the adjustment position of the magnet. When the magnet is located within the magnetic field range of the two single coils that are finally energized, a new single coil in the same coil group is turned on in the expected moving direction of the magnet, and the energization direction of the single coil is the same as the energization direction of the single coil that is closer to it in step S11; when the magnet is outside the magnetic field range of the two single coils that are finally energized, each single coil is turned on in the expected moving direction of the magnet.

[0018] S13: Adjust the current of the single coil energized in step S12 to move the magnet in the expected direction.

[0019] S14: gradually increase the current of the single coil at the end that is newly turned on in step S12 until it is equal to the current of the single coil that is farther away from it in step S11; at the same time, gradually reduce the current of the single coil in the middle until its current is zero.

[0020] The present invention also provides a zoom method, which adopts the above-mentioned linear Ampere force balance zoom endoscope zoom structure and comprises the following steps: S21: setting an initial equilibrium state, wherein the magnet maintains equilibrium under the action of two adjacent single coils in the same coil group and with opposite current supply directions; S22: Turning on the adjacent single coil in the expected moving direction of the magnet, and the power-on direction of the single coil is the same as the power-on direction of the single coil that is closer to it in step S21; then adjusting the current of the powered single coil to make the magnet move in the expected direction; S23: gradually increase the current of the newly turned-on single coil in step S22 until it is equal to the current of the single coil farther away from it in step S21; at the same time, gradually reduce the current of the single coil in the middle until its current is zero, so that the magnet moves toward the newly turned-on single coil by a distance equal to half the width of the single coil.

[0021] The beneficial effects of the present invention are: (1) The present invention winds a plurality of single coils around the outside of the outer barrel, and controls the current directions of different single coils to enable the magnet to achieve Ampere force balance at different positions. As long as the current of the single coil is stable, the magnet can be stabilized in the equilibrium position. Compared with the electric drive structure of the prior art, the present invention has a simple structure, high safety, and high positioning accuracy.

[0022] (2) The present invention can realize continuous step-by-step movement of the moving lens in a certain direction by sequentially changing the on-off state of adjacent single coils.

[0023] (3) The present invention can be provided with a plurality of coil groups, and the single coils between different coil 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

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Figure 1 It is an exploded view of a specific implementation of the endoscope zoom structure with linear Ampere force balance zoom according to the present invention; Figure 2It is an axial cross-sectional view of a specific embodiment of the endoscope zoom structure with linear Ampere force balance zoom according to the present invention; Figure 3 is a schematic diagram of the equilibrium position of the magnet when it is driven by the first single coil and the second single coil; Figure 4 The magnet is made of Figure 3 The equilibrium position shown shifts to Figure 5 Schematic diagram of current changes during the equilibrium position process shown; Figure 5 is a schematic diagram of the equilibrium position of the magnet when it is driven by the first single coil and the third single coil; Figure 6 It is a schematic diagram of the equilibrium position of the magnet when it is driven by the second single coil and the third single coil.

[0026] In the figure, 1, outer lens barrel, 101, barrel body, 102, boss, 2, inner lens barrel, 3, movable lens, 4, magnet, 5, coil group, 501, first single coil, 502, second single coil, 503, third single coil, 6, front lens barrel assembly, 601, front lens barrel, 602, first lens, 603, second lens, 7, rear lens barrel assembly, 701, rear lens barrel, 702, third lens, 8, mounting groove, 9, single coil. DETAILED DESCRIPTION

[0027] 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.

[0028] like Figure 1-Figure 3 As shown, a linear Ampere force balanced zoom endoscope zoom structure comprises an outer lens barrel 1, an inner lens barrel 2 located inside the outer lens barrel 1 and a movable lens 3 moving synchronously with the inner lens barrel 2, a plurality of magnets 4 are fixed to the outer circumference of the inner lens barrel 2, one or more coil groups 5 are wound around the outer circumference of the outer lens barrel 1, each coil group 5 comprises a plurality of single coils 9 arranged along the axial direction of the outer lens barrel 1, each single coil 9 in the same coil group 5 is independently connected to an external circuit, and the single coils 9 in different coil groups 5 are connected in series one by one, when the movable lens 3 is in a balanced state, the single coils 9 that are turned on in each coil group 5 have currents in opposite directions, and the length of the magnets 4 along the axial direction of the outer lens barrel 1 is less than or equal to the maximum distance between the turned on single coils 9.

[0029] Since the current directions of the two single coils 9 in the coil group 5 are opposite, Ampere forces in opposite directions are generated on the magnet 4. When the magnet 4 is located in the middle of the two single coils 9, the Ampere force balance can be achieved. By adjusting the energization conditions of different single coils 9, the magnet 4 can be moved to different positions. In addition, since the coil is wound around the outside of the outer lens barrel 1 and is completely exposed to the outside, it is convenient to connect the wires, and it is separated from the internal structure of the endoscope, so there is no risk of leakage. From the perspective of structure and size, the coil can be directly wound around the outer lens barrel 1, and there is no need to process the groove structure on the surface of the outer lens barrel 1, thereby reducing the installation and production costs, and the radial size occupied by the coil is small, and the maximum size of the endoscope is not much different from the size of the lens, which can achieve a miniaturized design of the endoscope.

[0030] The length limit of the magnet 4 is to prevent a part of the magnet 4 from exceeding the Ampere force range of the energized single coil 9, causing unstable force and thus failing to drive the magnet 4 to move in a specified direction.

[0031] Only one group of coil groups 5 can be set, that is, each single coil 9 is connected to a loop. When multiple groups of coil groups 5 are set, the single coils 9 in the same group of coil groups 5 are arranged in sequence. When the magnet 4 moves inside one group of coil groups 5, the single coils 9 in other coil groups 5 are farther away from the magnet 4, and have less influence on the Ampere force of the magnet 4. Setting multiple groups of coil groups 5 can reduce the number of external loops. If two groups of coil groups 5 are set, the single coils 9 between the coil groups 5 can be connected in series one by one. Therefore, with the same number of single coils 9, the number of external loops can be reduced by half.

[0032] It should be noted that, since the movable lens 3 and the magnet 4 are both mounted on the inner lens barrel 2, the movement of the magnet 4 is the movement of the movable lens 3 and the inner lens barrel 2, and the movable lens 3 being in a balanced state means that the magnet 4 and the inner lens barrel 2 are in a balanced state.

[0033] The inner lens barrel 2 is preferably made of weak magnetic material to improve the adjustment sensitivity.

[0034] When the movable lens 3 is in a balanced state, at least two single coils 9 in the coil group 5 need to be connected in the loop, and the two single coils 9 generate Ampere forces in opposite directions on the magnet 4. The Ampere force can also be applied to the magnet 4 by multiple single coils 9 that are connected. For ease of operation, the present invention only conducts two single coils 9, and at this time the length of the magnet 4 is required to be less than or equal to the distance between the two single coils 9. The direction of the Ampere force is related to the direction of the current. It is preferred that two single coils 9 with opposite current directions generate Ampere forces in the opposite direction on the magnet 4, that is, the two single coils 9 push the magnet 4 to the opposite side, so that the magnet 4 is stably located in the middle of the two single coils 9.

[0035] The magnets 4 are preferably arranged in an array along the circumferential direction, so that the radial force of the inner lens barrel 2 can be balanced, the inner lens barrel 2 and the outer lens barrel 1 are kept on the same axis, and the inner lens barrel 2 only reciprocates along the axial direction. Figure 1 As shown, the outer periphery of the inner lens barrel 2 has a plurality of mounting grooves 8 for accommodating the magnets 4 .

[0036] The endoscope generally includes a front lens barrel assembly 6 and a rear lens barrel assembly 7 fixed to the outer lens barrel 1. Figure 1 As shown, the front lens barrel assembly 6 includes a front lens barrel 601 and a first lens 602 and a second lens 603 installed in the front lens barrel 601, and the rear lens barrel assembly 7 includes a rear lens barrel 701 and a third lens 702 located in the rear lens barrel 701. The front lens barrel 601 and the rear lens barrel 701 are respectively installed at both ends of the outer lens barrel 1.

[0037] In order to reduce the radial dimension of the endoscope, it is preferred that the outer diameter of each single coil 9 is equal to the outer diameter of the front barrel assembly 6 and the rear barrel assembly 7. This can be achieved by the following assembly structure: the outer barrel 1 includes a barrel body 101 and a convex shoulder 102 located at one or both ends of the barrel body 101 and protruding radially outward, the coil group 5 abuts against one of the convex shoulders 102, and the outer diameter of the convex shoulder 102 is equal to the outer diameter of the coil group 5. Figure 2 As shown, the left end of the barrel 101 is provided with a convex shoulder 102, and the coil assembly 5 is arranged close to the convex shoulder 102 at the left end. Due to the thinning design at the barrel 101, the coil assembly 5 does not protrude from the surface of the endoscope, so that the coil assembly 5, the convex shoulder 102 and the outer surfaces of the front lens barrel 601 and the rear lens barrel 701 can remain flush.

[0038] In order to achieve the translation of the magnet 4 , three or more single coils 9 need to be provided in each coil group 5 , so that the switching of the current conditions of different single coils 9 can be achieved.

[0039] The width of each single coil 9 can be designed according to actual needs. Usually, the width of each single coil 9 is selected to be equal, and the Ampere force generated when equal current is passed is also equal. The width of the single coil 9 refers to the size of the single coil 9 along the axial direction of the outer barrel 1.

[0040] The present invention provides a zoom method, which is used to translate the overall structure formed by the endoscope barrel 2, the magnet 4 and the movable lens 3 from a certain equilibrium position to any other equilibrium position. The method adopts the above-mentioned linear Ampere force balanced zoom endoscope zoom structure, and includes the following steps: S11: setting an initial equilibrium state, the magnet 4 maintains equilibrium under the action of two single coils 9 with opposite current flow directions in the same coil group 5, and the initial equilibrium position is defined as the first equilibrium position.

[0041] S2: Select the two single coils 9 that need to be energized in the end according to the adjustment position of the magnet 4. When the magnet 4 is located in the magnetic field range of the two single coils 9 that are finally energized, the new single coil 9 in the same coil group 5 is turned on in the expected moving direction of the magnet 4. When the magnet 4 is located outside the magnetic field range of the two single coils that are finally energized, each single coil 9 is turned on in the expected moving direction of the magnet 4. Here, it is defined that the magnet 4 needs to be adjusted to the second equilibrium position. Assuming that there is only one coil group 5, there are six single coils 9 in total. At the first equilibrium position, the first and second single coils 9 on the far left are energized, then the magnet 4 is at the first and second single coils 9, and the second equilibrium position is at the fourth and fifth single coils 9. If the magnet 4 at the first equilibrium position is within the magnetic field range of the fourth and fifth single coils 9, the fourth and fifth single coils 9 can be directly turned on. If the magnet 4 at the first equilibrium position is not within the magnetic field range of the fourth and fifth single coils 9, it is necessary to turn on the third to fifth single coils 9 (i.e., all single coils 9 on the right side of the first equilibrium position) at the same time, so as to slowly guide the magnet 4 to the second equilibrium position on the right.

[0042] S13: Adjust the current of the two single coils 9 energized in step S12 to move the magnet 4 in the expected direction.

[0043] S14: gradually increase the current of the single coil 9 at the end that is newly turned on in step S12 until it is equal to the current of the single coil 9 that is farther away from it in step S11; at the same time, gradually reduce the current of the single coil 9 in the middle until its current is zero. During the current change process, the current direction of each single coil 9 no longer changes, and the magnet 4 is gradually moved to the second equilibrium position by adjusting the current size. At the same time, the current that does not need to be energized is gradually reduced to zero through the slow change of the current, and the current of the two single coils 9 that are finally energized gradually increases to the maximum and balances, thereby ensuring the stable translation of the magnet 4.

[0044] The present invention also proposes a step-by-step zoom method, wherein the step-by-step method means that the distance that the magnet 4 moves each time is equal. The method adopts the above-mentioned linear Ampere force balance zoom endoscope zoom structure, and comprises the following steps: S21: Set the initial equilibrium state, the magnet 4 is kept in equilibrium by the action of two adjacent single coils 9 in the same coil group 5 with opposite current supply directions. S22: Turn on the adjacent single coil 9 in the expected moving direction of the magnet 4, and the power-on direction of the single coil 9 is the same as the power-on direction of the single coil 9 that is closer to it in step S21; then adjust the current of the energized single coil 9 to make the magnet 4 move in the expected direction.

[0045] S23: gradually increase the current of the newly turned-on single coil 9 in step S22 until it is equal to the current of the single coil 9 farther away from it in step S21; at the same time, gradually reduce the current of the single coil 9 in the middle until its current is zero, so that the magnet 4 moves toward the newly turned-on single coil 9 by a distance equal to half the width of the single coil 9.

[0046] The main principle of the step-by-step zoom method is that the width of each single coil 9 is the same, and adjacent single coils 9 are energized alternately.

[0047] The working principle is described below according to a specific embodiment of the present invention.

[0048] like Figure 1 and Figure 2 As shown, a linear Ampere force balanced zoom endoscope zoom structure includes an outer barrel 1, an inner barrel 2 located inside the outer barrel 1, and a movable lens 3 that moves synchronously with the inner barrel 2. Six magnets 4 are fixed to the outer circumference of the inner barrel 2. Two groups of coil groups 5 are wound around the outer circumference of the outer barrel 1. Each group of coil groups 5 includes three single coils 9 arranged along the axial direction of the outer barrel 1. For the convenience of description, the three single coils 9 are named as the first single coil 501, the second single coil 502 and the third single coil 503 in sequence. The three single coils 9 are independently connected to the external circuit respectively, and the single coils 9 in different coil groups 5 are connected in series one by one, that is, the two first single coils 501 are connected in series to the external circuit, the two second single coils 502 are connected in series to the external circuit, and the two third single coils 503 are connected in series to the external circuit.

[0049] The width of each single coil 9 is equal. In order to reduce the axial length of the outer barrel 1, the length of the magnet 4 should be as small as possible. In this embodiment, the length of the magnet 4 is equal to the width of two single coils 9. As long as the circuit of two adjacent single coils 9 or two single coils 9 separated by one single coil 9 is turned on, the force balance of the magnet 4 can be achieved.

[0050] Regardless of whether it is a step-by-step zoom method or a non-step-by-step zoom method, during the transformation of the magnet 4 from the first equilibrium position to the second equilibrium position, the single coils 9 corresponding to the first equilibrium position and the second equilibrium position need to be turned on, and the displacement of the magnet 4 is achieved by gradually adjusting the current size and direction.

[0051] When the stepping zoom mode is adopted, when the moving distance is long, the magnet 4 is translated multiple times by repeatedly changing different single coils 9 until reaching the specified position. Compared with the non-stepping zoom mode, the control procedure of the stepping zoom mode is simpler and more standardized.

[0052] The specific working process is as follows: like Figure 3As shown, currents of equal magnitude and opposite directions are passed through the first single coil 501 and the second single coil 502, and the directions of the currents are as follows: Figure 3 As shown, Figure 3 Only the current direction of the left coil group 5 is indicated. In fact, the first single coil 501 and the second single coil 502 in the two coil groups 5 are both passed with currents of equal magnitude and opposite directions. However, the Ampere force formed by the right coil group 5 is weaker and can be ignored because it is farther away from the magnet 4. The first single coil 501 generates an Ampere force to the right, and the second single coil 502 generates an Ampere force to the left. The magnet 4 is at Figure 3 The inner lens barrel 2, the magnet 4 and the movable lens 3 are in a balanced position and are subjected to Ampere forces of equal magnitude and opposite direction. When the position of the integral structure formed by the inner lens barrel 2, the magnet 4 and the movable lens 3 (referred to as the movable lens barrel assembly) is offset, the Ampere forces of the first single coil 501 and the second single coil 502 and the magnet 4 change in magnitude and are no longer equal. The Ampere force causes the movable lens barrel assembly to return to a balanced position.

[0053] When the movable lens barrel assembly needs to be moved to the right, the third single coil 503 is firstly supplied with a current in the same direction as the second single coil 502, and the current magnitude of the second single coil 502 is gradually reduced (e.g. Figure 4 As shown in FIG. 1 ), the current of the first single coil 501 is greater than the sum of the currents of the second single coil 502 and the third single coil 503, so that the magnet 4 can be pulled to the right, thereby achieving a continuous zoom effect. Until the equilibrium position of the moving lens barrel assembly becomes Figure 5 The second single coil 502 does not pass current, and the currents of the first single coil 501 and the third single coil 503 are equal.

[0054] Then, the second single coil 502 is passed with a current in the same direction as the first single coil 501, and the current of the first single coil 501 is gradually weakened. The current of the third single coil 503 is less than the sum of the currents of the second single coil 502 and the first single coil 501. In this way, the magnet 4 can be pulled to the right continuously until the equilibrium position of the moving lens barrel assembly becomes Figure 6 The first single coil 501 is not current-carrying, and the currents of the second single coil 502 and the third single coil 503 are equal. In this way, the moving lens barrel assembly completes a moving cycle.

[0055] When it is necessary to Figure 6When the movable lens barrel assembly continues to move rightward from the position shown, the first single coil 501 can be fed with a current in the same direction as the third single coil 503, the current in the third single coil 503 gradually decreases, and the current magnitudes of the first single coil 501 and the second single coil 502 are controlled at the same time, so that the second single coil 502 can push the magnet 4 to the right, and finally the movable lens barrel assembly stays between the second single coil 502 of the left coil group 5 and the first single coil 501 of the right coil group 5. With this current control method, the movable lens barrel assembly can be moved to any position.

[0056] Continuous follow Figure 3 → Figure 4 → Figure 5 → Figure 6 ...by changing the current, the movable lens barrel assembly can be driven continuously to the right.

[0057] Continuous follow Figure 6 → Figure 5 → Figure 4 → Figure 3 ...by changing the current, the movable lens barrel assembly can be driven continuously to the left.

[0058] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as "length", "width", "left", "right", "inside", "outside", "axial", and "radial" are 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.

[0059] 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, 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 ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] 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.

[0061] 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 endoscope zoom structure with linear Ampere force balance zoom, characterized in that: The invention comprises an outer lens barrel (1), an inner lens barrel (2) located inside the outer lens barrel (1), and a movable lens (3) moving synchronously with the inner lens barrel (2); a plurality of magnets (4) are fixed to the outer peripheral surface of the inner lens barrel (2); one or more coil groups (5) are wound around the outer peripheral surface of the outer lens barrel (1); each coil group (5) comprises a plurality of single coils (9) arranged along the axial direction of the outer lens barrel (1); each single coil (9) in the same coil group (5) is independently connected to an external circuit; the single coils (9) in different coil groups (5) are connected in series one by one; when the movable lens (3) is in a balanced state, the single coils (9) in each coil group (5) have currents in opposite directions, and the length of the magnets (4) along the axial direction of the outer lens barrel (1) is less than or equal to the maximum distance between the single coils (9) that are connected.

2. The linear Ampere force balanced zoom endoscope structure according to claim 1, characterized in that: When the movable lens (3) is in a balanced state, the circuit containing only two single coils (9) in each coil group (5) is turned on, and the currents are in opposite directions, and the length of the magnet (4) along the axial direction of the outer lens barrel (1) is less than or equal to the distance between the two single coils (9).

3. The linear Ampere force balanced zoom endoscope structure according to claim 1, characterized in that: Each coil group (5) is provided with three or more single coils (9).

4. The linear Ampere force balanced zoom endoscope structure according to claim 2, characterized in that: Two single coils (9) in the circuit where the circuit is conducting are adjacent to each other or separated by a single coil (9).

5. The linear Ampere force balanced zoom endoscope structure according to claim 4, characterized in that: The width of each single coil (9) is equal, and the length of the magnet (4) along the axial direction of the outer lens barrel (1) is less than or equal to the sum of the widths of the two single coils (9).

6. The linear Ampere force balanced zoom endoscope structure according to claim 2, characterized in that: When the movable lens (3) is in a balanced state, the two single coils (9) with currents in opposite directions generate an Ampere force in the positive direction on the magnet (4).

7. The linear Ampere force balanced zoom endoscope structure according to claim 1, characterized in that: The inner lens barrel (2) is made of weak magnetic material.

8. The linear Ampere force balanced zoom endoscope structure according to claim 1, characterized in that: It also includes a front lens barrel assembly (6) and a rear lens barrel assembly (7) fixed to the outer lens barrel (1), and the outer diameter of each of the single coils (9) is equal to the outer diameter of the front lens barrel assembly (6) and the rear lens barrel assembly (7); The outer lens barrel (1) comprises a barrel body (101) and a boss (102) located at one end or both ends of the barrel body (101) and protruding radially outward, the coil assembly (5) abuts against one of the bosses (102), and the outer diameter of the boss (102) is equal to the outer diameter of the coil assembly (5).

9. A zoom method, characterized in that: The method adopts the endoscope zoom structure of linear Ampere force balanced zoom according to any one of claims 1 to 8, and comprises the following steps: S11: setting an initial equilibrium state, wherein the magnet (4) maintains equilibrium under the action of two single coils (9) with opposite current flow directions in the same coil group (5); S12: selecting two single coils (9) that are ultimately to be energized according to the adjusted position of the magnet (4); when the magnet (4) is located within the magnetic field range of the two single coils (9) that are ultimately energized, a new single coil (9) in the same coil group (5) is energized in the direction in which the magnet (4) is expected to move; when the magnet (4) is located outside the magnetic field range of the two single coils that are ultimately energized, each single coil (9) is energized in the direction in which the magnet (4) is expected to move; S13: adjusting the current of the single coil (9) energized in step S12 to move the magnet (4) in the expected direction; S14: gradually increase the current of the single coil (9) at the end that was newly turned on in step S12 until it is equal to the current of the single coil (9) that is farther away from it in step S11; at the same time, gradually reduce the current of the single coil (9) in the middle until its current is zero.

10. A zoom method, characterized in that: The method adopts the endoscope zoom structure of linear Ampere force balanced zoom according to any one of claims 1 to 8, and comprises the following steps: S21: setting an initial equilibrium state, wherein the magnet (4) maintains equilibrium under the action of two adjacent single coils (9) in the same coil group (5) and energized in opposite directions; S22: turning on the adjacent single coil (9) in the expected moving direction of the magnet (4), and the power-on direction of the single coil (9) is the same as the power-on direction of the single coil (9) that is closer to it in step S21; then adjusting the current of the powered single coil (9) to move the magnet (4) in the expected direction; S23: gradually increase the current of the single coil (9) newly turned on in step S22 until it is equal to the current of the single coil (9) farther away from it in step S21; at the same time, gradually reduce the current of the single coil (9) located in the middle until its current is zero, so that the magnet (4) moves in the direction of the newly turned on single coil (9) by a distance equal to half the width of the single coil (9).

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