Three-phase electrically-driven endoscope zoom structure

Abstract

The utility model discloses a three-phase electrically-driven endoscope zoom structure which comprises an outer lens barrel and a movable lens barrel assembly. The movable lens cone assembly comprises an inner lens cone, a movable lens and a magnet. A coil framework is fixed outside the outer lens cone, three coil assemblies are wound on the coil framework, each coil assembly comprises a plurality of winding coils which are arranged in a circumferential array and are sequentially connected in series, and magnets are located outside the inner lens cone and correspond to the winding coils in the single coil assembly in number. The contact surfaces of the outer lens cone and the inner lens cone are provided with spiral tracks which are matched with each other; the winding coils in the three coil groups are arranged at intervals, outgoing lines at one ends of the three coil groups are common ends, and outgoing lines at the other ends of the three coil groups are respectively connected with a power supply to form a three-phase circuit; and the movable lens barrel assembly moves along the spiral track by conducting two coil assemblies. According to the utility model, the winding coil is circumferentially arranged, and the rotary motion is converted into the linear motion of the movable lens cone assembly through the spiral track, so that the axial length of the endoscope can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a three-phase electrically driven endoscope zoom structure. Background Technology

[0002] Endoscopic zoom structures achieve focal length changes by adjusting the position of moving lenses along the optical axis. Traditionally, a mechanical structure is used, with the moving lenses manually driven. This driving method has a slow response speed and low positioning accuracy.

[0003] Existing technologies also employ electric drive to adjust the moving lens. However, existing electric drive components are arranged along the direction of movement of the moving lens. For example, the zoom structure disclosed in patent number CN115670350A achieves a stable state for the moving lens by balancing the electromagnetic force of the electromagnet with the elastic force of the spring. The spring needs to be arranged at both ends of the moving lens along its length. Therefore, the axial length of the outer endoscope tube must be greater than the axial length of the moving lens, resulting in an increase in the overall axial length of the endoscope, making it difficult to achieve miniaturization of the endoscope.

[0004] In addition, existing electrically driven endoscope zoom structures place the connection to external circuits inside the endoscope tube, which presents difficulties in wire connection and safety hazards.

[0005] Therefore, it is necessary to design an endoscope zoom structure that is highly safe, has a fast response speed, and occupies little space. Utility Model Content

[0006] To address the technical problem that the electric drive components in existing endoscope zoom structures are arranged along the direction of movement of the moving lens, resulting in an increased overall axial length of the endoscope and making it difficult to achieve miniaturization of the endoscope, this invention provides a three-phase electrically driven endoscope zoom structure to solve the above problems.

[0007] The technical solution adopted by this utility model to solve its technical problem is: a three-phase electrically driven endoscope zoom structure, including an outer endoscope tube and a movable endoscope tube assembly located inside the outer endoscope tube; the movable endoscope tube assembly includes an inner endoscope tube, a movable lens and a magnet.

[0008] The outer end of the scope tube is fixed with a coil frame, on which three coil groups are wound. Each coil group includes several winding coils arranged in a circumferential array and connected in series. The magnet is located on the outer surface of the inner end tube and corresponds to the number of poles of the winding coils in a single coil group. The contact surfaces of the outer and inner end tubes have mutually cooperating helical tracks. The poles of the winding coils in the three coil groups are arranged at intervals, and one end of each coil group is a common end, while the other end is connected to a power source to form a three-phase circuit. By activating two of the coil groups, the movable scope tube assembly moves along the helical track.

[0009] In an optional embodiment of this utility model, the outer surface of the outer lens tube is provided with a plurality of protrusions arranged in a circumferential array, the coil frame has mounting holes that cooperate with the protrusions, and the winding coil is wound on the coil frame between adjacent mounting holes.

[0010] In an optional embodiment of this invention, the outer surface of the endoscope tube has a first groove for accommodating a magnet.

[0011] In an optional embodiment of this utility model, the magnet has a long strip-shaped structure.

[0012] In an optional embodiment of this utility model, the spiral track is located on the inner surface of the outer endoscope tube, and the outer surface of the inner endoscope tube has a fitting for inserting the spiral track.

[0013] In an optional embodiment of this utility model, the mating component is a ball bearing installed on the outer surface of the endoscope tube, and the outer surface of the endoscope tube has a second groove for accommodating the ball bearing.

[0014] In an optional embodiment of this utility model, multiple balls are arranged along the circumferential direction on the outer surface of the endoscope tube.

[0015] In an optional embodiment of this invention, the number of winding coils in each coil group is 2 to 4.

[0016] An optional embodiment of this utility model further includes a front lens barrel assembly and a rear lens barrel assembly fixed to the outer lens barrel, wherein the outer diameter of the coil frame is less than or equal to the outer diameter of the front lens barrel assembly and the rear lens barrel assembly.

[0017] The beneficial effects of this utility model are:

[0018] (1) The present invention arranges the winding coil in a circle and converts the rotational motion into the linear motion of the moving endoscope assembly through a spiral track, thereby reducing the axial length of the endoscope.

[0019] (2) The present invention sets the winding coil outside the outer tube of the endoscope and the wiring part is located outside the endoscope, thereby reducing the wiring difficulty and improving product safety.

[0020] (3) This utility model realizes the movement of the moving lens barrel assembly by conducting two pairs of three-phase circuits, and the operation method is simple. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is an exploded view of a specific embodiment of the three-phase electrically driven endoscope zoom structure described in this utility model.

[0023] Figure 2 This is an axial sectional view of the present invention when the winding coil is cut.

[0024] Figure 3 This is an axial sectional view of the present invention when it is cut along the protrusion;

[0025] Figure 4 This is a schematic diagram of the circuit connection of the three coil groups in this utility model;

[0026] Figure 5 This is a state diagram of the magnet facing the first coil group in this utility model;

[0027] Figure 6 This is a state diagram of the magnet being directly opposite the third coil group in this utility model;

[0028] Figure 7 This is a schematic diagram showing the current changes in the three-phase branch when the magnet rotates clockwise in this utility model.

[0029] In the diagram, 1. Outer lens barrel, 101. Protrusion, 2. Inner lens barrel, 201. First groove, 3. Magnet, 4. Moving lens, 5. Ball bearing, 6. Winding 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. Moving lens barrel assembly, 10. Coil frame, 1001. Mounting hole, 11. Spiral track, 12. A pole, 13. X pole, 14. A' pole, 15. X' pole, 16. B pole, 17. Y pole, 18. B' pole, 19. Y' pole, 20. C pole, 21. Z pole, 22. C' pole, 23. Z' pole, 24. Second groove. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] Example 1

[0032] like Figures 1-3 As shown, a three-phase electrically driven endoscope zoom structure includes an outer endoscope tube 1 and a movable endoscope tube assembly 9 located inside the outer endoscope tube 1; the movable endoscope tube assembly 9 includes an inner endoscope tube 2, a movable lens 4, and a magnet 3.

[0033] A coil frame 10 is fixed to the outside of the outer lens tube 1. Three coil groups are wound on the coil frame 10. Each coil group includes several winding coils 6 arranged in a circular array and connected in series. The magnet 3 is located on the outer surface of the inner lens tube 2 and corresponds to the number of poles of the winding coils 6 in a single coil group. The contact surfaces of the outer lens tube 1 and the inner lens tube 2 have mutually cooperating spiral tracks 11. The poles of the winding coils 6 in the three coil groups are arranged at intervals, and one end of the lead wire of the three coil groups is a common end. The other end of the lead wire is connected to the power supply to form a three-phase circuit. The movable lens tube assembly 9 moves along the spiral track 11 by conducting two of the coil groups.

[0034] The three coil groups serve as three branches of the three-phase circuit. When the magnet 3 is directly opposite the winding coil 6 in one of the coil groups, the magnet 3 can be rotated by conducting the coil groups of the other two branches. Under the action of the spiral track 11, the moving mirror tube assembly 9 rotates and generates axial displacement.

[0035] Regarding the arrangement of the winding coils 6 on the coil frame 10: the winding coils 6 in each coil group are arranged in a circular array, with the positive and negative poles of the winding coils 6 separated by two winding slots, which are used for winding the winding coils in the other two coil groups, thereby making the poles of the winding coils 6 in different coil groups spaced apart from each other. The number of winding coils 6 in each coil group is 2 to 4.

[0036] This invention takes as an example that each coil group consists of two winding coils 6 connected in series. Each winding coil 6 has two poles, positive and negative. The two winding coils 6 have four poles, so the magnet 3 is set with four poles accordingly. Figure 4 and Figure 5 As shown, in the first coil group, pole A12 and pole X13 are the two poles of one winding coil 6, and pole A'14 and pole X'15 are the two poles of another winding coil 6. The two winding coils 6 are connected in series to form a U-phase branch. In the second coil group, pole B16 and pole Y17 are the two poles of one winding coil 6, and pole B'18 and pole Y'19 are the two poles of another winding coil 6. The two winding coils 6 are connected in series to form a V-phase branch. In the third coil group, pole C20 and pole Z21 are the two poles of one winding coil 6, and pole C'22 and pole Z'23 are the two poles of another winding coil 6. The two winding coils 6 are connected in series to form a W-phase branch.

[0037] The work process is as follows:

[0038] like Figure 4 and Figure 5 As shown, the V-phase branch and the W-phase branch are conducting, and the current flows from the V-phase branch into the W-phase branch. The magnet 3 is directly opposite the four positive and negative poles of the winding coil 6 in the first coil group. The magnetic field generated by the conductor is in the direction shown in the figure. Figure 5 As shown, since the magnetic field generated by the magnet 3 on the movable lens tube assembly 9 is in the same direction, this state can be kept in balance.

[0039] When magnet 3 needs to be rotated clockwise, the direction of current flow in winding coil 6 is changed, causing the current to flow from the V-phase branch into the U-phase branch. The magnetic field generated by the current changes as follows: Figure 6 As shown, correspondingly, the movable lens barrel assembly 9 rotates due to magnetic force to Figure 6 At the position shown, magnet 3 is directly opposite winding coil 6 in the third coil group.

[0040] By continuously changing the current in different coil groups, the moving lens barrel assembly 9 can be continuously rotated within the outer lens barrel 1, thus achieving continuous zoom. (See reference for current conversion method.) Figure 7 By reversing the direction of the current change, the moving lens tube assembly 9 can be rotated in the opposite direction inside the outer lens tube 1.

[0041] The assembly of the outer lens tube 1 and the coil frame 10 can be carried out in the following manner:

[0042] The outer surface of the outer lens barrel 1 is circumferentially arrayed with several protrusions 101. The coil frame 10 has mounting holes 1001 that mate with the protrusions 101. The coil frame 10 between adjacent mounting holes 1001 forms a winding groove to accommodate the winding coil 6. The two winding grooves through which the same winding coil 6 passes are spaced apart by two winding grooves. Figure 1 As shown, there are six winding coils 6 and twelve protrusions 101. The protrusions 101 not only fix the outer lens tube 1 and the coil frame 10, but also support the winding coils 6.

[0043] The magnet 3 can be a long strip structure. To prevent the magnet 3 from protruding from the surface of the endoscope tube 2, it is preferable to provide a first groove 201 for accommodating the magnet 3 on the outer surface of the endoscope tube 2. The magnet 3 is interference-fitted into the first groove 201, so that the endoscope tube 2 and the magnet 3 move synchronously.

[0044] The spiral track 11 can be located on the inner surface of the outer endoscope tube 1 or on the outer surface of the inner endoscope tube 2. Since the outer surface of the inner endoscope tube 2 needs to be fitted with a magnet 3, to avoid interference, this invention arranges the spiral track 11 on the inner surface of the outer endoscope tube 1, while the outer surface of the inner endoscope tube 2 is provided with a fitting for inserting the spiral track 11. When the movable endoscope tube assembly 9 rotates, the spiral track 11 converts the rotational motion into axial translational motion, realizing the movement of the movable lens 4, thereby improving the response speed of the endoscope's zoom.

[0045] The endoscope typically also includes a front endoscope assembly 7 and a rear endoscope assembly 8 fixed to the outer endoscope tube 1. The outer diameter of the coil frame 10 is less than or equal to the outer diameter of the front endoscope assembly 7 and the rear endoscope assembly 8. The front endoscope assembly 7 includes a front endoscope tube 7-1 and a first lens 7-2 and a second lens 7-3 located within the front endoscope tube 7-1. The rear endoscope assembly 8 includes a rear endoscope tube 8-1 and a third lens 8-2 located within the rear endoscope tube 8-1.

[0046] Example 2

[0047] Based on the above embodiments, the mating component is a ball bearing 5 installed on the outer surface of the endoscope barrel 2, and the outer surface of the endoscope barrel 2 has a second groove 24 for accommodating the ball bearing 5. Figure 1 and Figure 2 As shown, the second groove 24 is a circular groove, and the diameter of the ball 5 is greater than the depth of the second groove 24, so that the ball 5 can protrude from the outer surface of the endoscope tube 2 and roll in the spiral track 11. Multiple balls 5 can be set, preferably arranged in a circumferential array to ensure force balance.

[0048] In the description of this utility model, it should be understood that the terms "axial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0049] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "several" means two or more.

[0050] In this specification, the illustrative expressions of the terms do not necessarily refer to the same embodiments. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0051] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A three-phase electrically driven endoscope zoom structure, characterized in that: It includes an outer lens tube (1) and a movable lens tube assembly (9) located inside the outer lens tube (1); the movable lens tube assembly (9) includes an inner lens tube (2), a movable lens (4) and a magnet (3); The outer tube (1) is fixed with a coil frame (10), and three coil groups are wound on the coil frame (10). Each coil group includes several winding coils (6) arranged in a circular array and connected in series. The magnet (3) is located on the outer surface of the inner tube (2) and corresponds to the number of poles of the winding coils (6) in a single coil group. The contact surfaces of the outer tube (1) and the inner tube (2) have mutually cooperating spiral tracks (11). The poles of the winding coils (6) in the three coil groups are arranged at intervals, and one end of the lead wire of the three coil groups is a common end, and the other end of the lead wire is connected to the power supply to form a three-phase circuit. By conducting two of the coil groups, the moving tube assembly (9) moves along the spiral track (11).

2. The three-phase electrically driven endoscope zoom structure according to claim 1, characterized in that: The outer surface of the outer lens tube (1) is provided with a plurality of protrusions (101) arranged in a circumferential array. The coil frame (10) has mounting holes (1001) that cooperate with the protrusions (101). The winding coil (6) is wound on the coil frame (10) between adjacent mounting holes (1001).

3. The three-phase electrically driven endoscope zoom structure according to claim 1, characterized in that: The outer surface of the endoscope tube (2) has a first groove (201) for accommodating a magnet (3).

4. The three-phase electrically driven endoscope zoom structure according to claim 3, characterized in that: The magnet (3) has a long strip structure.

5. The three-phase electrically driven endoscope zoom structure according to claim 1, characterized in that: The spiral track (11) is located on the inner surface of the outer tube (1), and the outer surface of the inner tube (2) has a fitting for inserting the spiral track (11).

6. The three-phase electrically driven endoscope zoom structure according to claim 5, characterized in that: The fitting component is a ball bearing (5) installed on the outer surface of the endoscope tube (2), and the outer surface of the endoscope tube (2) has a second groove (24) for accommodating the ball bearing (5).

7. The three-phase electrically driven endoscope zoom structure according to claim 6, characterized in that: Multiple balls (5) are arranged along the circumferential direction on the outer surface of the endoscope tube (2).

8. The three-phase electrically driven endoscope zoom structure according to claim 1, characterized in that: The number of winding coils (6) in each coil group is 2 to 4.

9. The three-phase electrically driven endoscope zoom structure according to claim 1, characterized in that: It also includes a front lens barrel assembly (7) and a rear lens barrel assembly (8) fixed to the outer lens barrel (1), wherein the outer diameter of the coil frame (10) is less than or equal to the outer diameter of the front lens barrel assembly (7) and the rear lens barrel assembly (8).

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