Double-coil induction type endoscope zoom structure

Abstract

The utility model discloses a double-coil induction type endoscope zoom structure which comprises an outer lens barrel, an inner lens barrel located in the outer lens barrel, a movable lens moving synchronously with the inner lens barrel, a front lens barrel assembly and a rear lens barrel assembly. The front lens barrel assembly and the rear lens barrel assembly are fixed to the two ends of the outer lens barrel. The ends, facing the inner lens cone, of the front lens cone assembly and the rear lens cone assembly are each provided with a positioning magnet, and the polarities of the ends, facing the inner lens cone, of the positioning magnets are the same. An induction coil is wound on the peripheral surface of the inner lens cone, a driving coil is wound on the peripheral surface of the outer lens cone, the induction coil is not externally connected with a power supply, and the driving coil is externally connected with a power supply. According to the utility model, the induced magnetic field is generated through the change of the induced magnetic field of the induction coil, and the induced magnetic field interacts with the magnetic fields of the two magnets to move the induction coil, thereby realizing the movement of the movable lens and improving the response speed of zooming.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field especially, relate to a double coil inductive endoscope zoom structure. BACKGROUND

[0002] Endoscope zoom structure realizes the change of focal length through the position adjustment of moving lens along the optical axis direction, and the traditional mode is to adopt mechanical structure, and manually drives moving lens movement, and this driving mode is slow in response speed, and low in positioning accuracy.

[0003] There is also electric driving mode in prior art to adjust moving lens, but mostly adopts electromagnet drive, and the structure is relatively complex, and is mostly to realize the multi-position adjustment of moving lens, such as patent number CN115670350A discloses zoom structure, and the electromagnet is inlaid in the outer mirror barrel, at this time, the cooperation of spring is needed, and moving lens reaches stable state through the balance of electromagnetic force and elastic force, the structure has more parts, and the assembly difficulty and production cost are larger, and the adjustment efficiency is also lower.

[0004] The structure of coil and permanent magnet cooperation recorded in patent number CN201880049972, this structure can only realize the position adjustment of moving lens at two end portions, but needs to set two coils to change the magnetic force size of two ends of permanent magnet respectively, and the size of permanent magnet is larger, which increases the radial size of endoscope, and the permanent magnet continuously generating magnetic field also appears the phenomenon of magnetic flux leakage, which influences the working state of other parts in endoscope, thereby causing the service life reduction of endoscope.

[0005] In addition, the endoscope zoom structure of electric driving in prior art is all placed in the mirror barrel with the structure connected with external circuit, which has the difficulty of wire connection, and also has safety hazards.

[0006] Therefore, it is needed to design an endoscope zoom structure with high safety, fast response speed and small space occupation. UTILITY MODEL CONTENT

[0007] In order to solve the technical problems of complex structure, great safety hazard and large size of endoscope zoom structure in prior art, the utility model provides a double coil inductive endoscope zoom structure to solve the above problems.

[0008] The utility model discloses a technical scheme that solves its technical problem is adopted: a double coil inductive endoscope zoom structure, including outer mirror barrel, the inner mirror barrel in outer mirror barrel, with the synchronous motion of inner mirror barrel mobile lens and fixed in the front mirror barrel subassembly and rear mirror barrel subassembly of outer mirror barrel both ends, the front mirror barrel subassembly and rear mirror barrel subassembly towards the one end of inner mirror barrel respectively install locating magnet, and the polarity of locating magnet towards the one end of inner mirror barrel is same.

[0009] Further, the inner mirror barrel is made of weak magnetic material.

[0010] Further, the locating magnet is annular structure.

[0011] Further, the two ends of the inner mirror barrel have the first shoulder that projects radially outward, and the inductive coil is located between the two first shoulders.

[0012] Further, the first shoulder is in sliding contact with the inner surface of the outer mirror barrel, and the outer diameter of the inductive coil is equal to the outer diameter of the first shoulder.

[0013] Further, one end of the inner mirror barrel has the second shoulder that projects radially inward, and the mobile lens is fixed on the second shoulder.

[0014] Further, the axial length of the driving coil is greater than the axial length of the inductive coil.

[0015] The utility model discloses the beneficial effect is:

[0016] (1) the utility model discloses a inductive coil inductive magnetic field variation produces the inductive magnetic field, and the inductive magnetic field and the magnetic field of two magnets interact and make inductive coil move, thereby realizing the movement of mobile lens, and the response speed of zoom is promoted.

[0017] (2) the utility model discloses the driving coil of connecting with external power supply is placed in the outside of outer mirror barrel, therefore the difficulty of wire connection reduces, also does not have the leakage risk, and the inductive coil in the utility model discloses only produces the magnetic field when the driving coil is electrified, under the condition of not electrifying, most of the components do not have magnetism, therefore will not produce the magnetic leakage phenomenon, and the service life of endoscope is higher. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model is further illustrated in connection with the drawings and examples.

[0019] Figure 1 It is the explosion map of the specific embodiment of the double coil inductive endoscope zoom structure of the utility model;

[0020] Figure 2 is the axial sectional view of the specific embodiment of the double-coil induction type endoscope zoom structure of the utility model;

[0021] Figure 3 is the schematic diagram of the current size change in the drive coil 6 during the movement of the mobile lens barrel assembly before and after.

[0022] In the figure, 1, outer lens barrel, 2, inner lens barrel, 2-1, first shoulder, 2-2, second shoulder, 3, mobile lens, 4, induction coil, 5, positioning magnet, 6, drive 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, mobile lens barrel assembly. DETAILED DESCRIPTION

[0023] The embodiments of the utility model are described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.

[0024] As Figure 1 and Figure 2 shown, a double-coil induction type endoscope zoom structure, comprising outer lens barrel 1, inner lens barrel 2 located in outer lens barrel 1, mobile lens 3 with inner lens barrel 2 synchronous movement and fixed at both ends of outer lens barrel 1 front lens barrel assembly 7 and rear lens barrel assembly 8, front lens barrel assembly 7 and rear lens barrel assembly 8 towards one end of inner lens barrel 2 respectively install positioning magnet 5, and the polarity of positioning magnet 5 towards one end of inner lens barrel 2 is same;The outer circumferential surface of inner lens barrel 2 is wound with induction coil 4, and the outer circumferential surface of outer lens barrel 1 is wound with drive coil 6, and induction coil 4 is not externally connected power supply, and drive coil 6 is externally connected power supply.

[0025] Inner lens barrel 2, induction coil 4 and mobile lens 3 form mobile lens barrel assembly 9, can reciprocate in outer lens barrel 1 along the axial direction, drive coil 6 is fixed on the outside of outer lens barrel 1, and is externally connected power supply, and induction coil 4 is fixed on the outside of inner lens barrel 2, is the multiple-turn coil for forming loop, and is not externally connected power supply. The utility model aims to realize double-focus drive, that is, even if mobile lens barrel assembly 9 switches between the leftmost end and the rightmost end of outer lens barrel 1, the transformation of two focal points is realized.

[0026] Inner lens barrel 2 is a weak magnetic conductor, and is attracted by positioning magnet 5 at both ends of the stroke and fixed at the limit stroke.

[0027] As Figure 2 , two positioning magnets 5 are opposite poles.

[0028] When zooming, the driving coil 6 is energized to change the magnetic flux passing through the middle of the induction coil 4, and the induction coil 4 generates an induced current. The direction of the induced current is opposite to the current direction of the driving coil 6, so as to prevent the change of the magnetic flux. The induced current on the induction coil 4 makes the moving lens barrel assembly 9 become an electromagnet, and the direction of the induced current is different, so the polarity direction of the electromagnet is also different, and then the moving lens barrel assembly 9 is driven to move in different directions left and right through the interaction with the two end positioning magnets 5, that is, the double focus driving is realized.

[0029] The front lens barrel assembly 7 generally comprises a front lens barrel 7-1 and a first lens 7-2 and a second lens 7-3 located in the front lens barrel 7-1, and the rear lens barrel assembly 8 generally comprises a rear lens barrel 8-1 and a third lens 8-2 located in the rear lens barrel 8-1, as shown in the figure. Figure 2 The front lens barrel assembly 7 is located at the left end of the outer lens barrel 1, and the rear lens barrel assembly 8 is located at the right end of the outer lens barrel 1, and the positioning magnets 5 are fixed at the right end of the front lens barrel 7-1 and the left end of the rear lens barrel 8-1 respectively, and the opposite faces of the two positioning magnets 5 have the same polarity. When the driving coil 6 is energized, the moving lens barrel assembly 9 becomes an electromagnet, one end of the positioning magnet 5 generates a repulsive force on the moving lens barrel assembly 9, and the other end of the positioning magnet 5 generates an attractive force on the moving lens barrel assembly 9, so that the moving lens barrel assembly 9 moves to one end.

[0030] The positioning magnet 5 is preferably in a ring structure, which can make the end face of the moving lens barrel assembly 9 bear force uniformly. The positioning magnet 5 in the utility model is in a circular ring structure. The mounting steps are arranged at the end portions of the front lens barrel 7-1 and the rear lens barrel 8-1, the positioning magnet 5 can be embedded in the mounting steps, the outer peripheral surface of the positioning magnet 5 is shielded by the front lens barrel 7-1 and the rear lens barrel 8-1, and only the end portion is opposite to the moving lens barrel assembly 9, which not only reduces the overall axial length, but also reduces the exposed area of the positioning magnet 5, and reduces the influence of the magnetic field on the working state of the remaining parts.

[0031] In order to enable the induction coil 4 to be completely located in the magnetic flux range generated by the driving coil 6, the axial length of the driving coil 6 is preferably greater than the axial length of the induction coil 4, and in further design, the length of the driving coil 6 is not less than the movement stroke of the moving lens barrel assembly 9.

[0032] For the assembly of the induction coil 4 and the moving lens 3, the utility model discloses a structure design of the inner lens barrel 2, and the induction coil 4 and the moving lens 3 are positioned and installed, specifically, the two ends of the inner lens barrel 2 have the first shoulder 2-1 that protrudes radially outward, and the induction coil 4 is located between the two first shoulders 2-1. The two first shoulders 2-1 can limit the two ends of the induction coil 4, the outer diameter of the first shoulder 2-1 is slightly smaller than the inner diameter of the outer lens barrel 1, so that the first shoulder 2-1 can slide with the inner surface of the outer lens barrel 1, and the outer diameter of the induction coil 4 is equal to the outer diameter of the first shoulder 2-1, that is, the induction coil 4 is filled in the cavity formed by the inner lens barrel 2 and the outer lens barrel 1.

[0033] One end of the inner lens barrel 2 has the second shoulder 2-2 that protrudes radially inward, and the second shoulder 2-2 provides a mounting surface for the moving lens 3, so that the connection strength of the moving lens 3 and the inner lens barrel 2 can be improved, and the moving lens 3 can be prevented from falling off.

[0034] In order to prevent the moving lens barrel assembly 9 from generating excessive induced current on the induction coil 4 after moving, causing the moving lens barrel to move in the opposite direction, the current on the driving coil 6 needs to be slowly reduced during the moving process, as shown in the figure. Figure 3

[0035] The utility model discloses a double-coil structure to form an electromagnet for the moving lens barrel assembly 9, and the electromagnet interacts with the positioning magnet 5 to realize double-focus driving. Compared with the traditional zoom structure, the utility model has the advantages of simple structure, convenient operation, fast response speed, and convenient and reliable electrical connection. In the idle state, the induction coil 4 and the driving coil 6 do not generate a magnetic field, and the magnetic field generated by the two positioning magnets 5 is weak, so that the risk of reducing the service life of the endoscope caused by magnetic leakage can be avoided.

[0036] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "length", "left", "right", "inner", "outer", "axial" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as 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 limiting the utility model.

[0037] In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In the description of the utility model, it should be pointed out that, unless otherwise explicitly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected, can be mechanical connection, or electrical connection, can be directly connected, or indirectly connected through an intermediate medium.

[0038] ​In this description, illustrative instances of the terminology do not necessarily refer to the same embodiment. Moreover, specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments.

[0039] With the above ideal embodiments according to the utility model as the inspiration, through the above description, the relevant staff can make various changes and modifications without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A dual-coil induction endoscope zoom structure, characterized in that: It includes an outer endoscope tube (1), an inner endoscope tube (2) located inside the outer endoscope tube (1), a movable lens (3) that moves synchronously with the inner endoscope tube (2), and a front endoscope tube assembly (7) and a rear endoscope tube assembly (8) fixed at both ends of the outer endoscope tube (1). The front endoscope tube assembly (7) and the rear endoscope tube assembly (8) are respectively equipped with positioning magnets (5) at the end facing the inner endoscope tube (2), and the polarity of the positioning magnets (5) facing the end of the inner endoscope tube (2) is the same. An induction coil (4) is wound around the outer circumference of the endoscope tube (2), and a drive coil (6) is wound around the outer circumference of the outer endoscope tube (1). The induction coil (4) is not connected to an external power source, while the drive coil (6) is connected to an external power source.

2. The dual-coil induction endoscope zoom structure according to claim 1, characterized in that: The endoscope tube (2) is made of a weakly magnetic material.

3. The dual-coil induction endoscope zoom structure according to claim 1, characterized in that: The positioning magnet (5) has a ring structure.

4. The dual-coil induction endoscope zoom structure according to claim 1, characterized in that: The endoscope tube (2) has first shoulders (2-1) that bulge outward radially at both ends, and the induction coil (4) is located between the two first shoulders (2-1).

5. The dual-coil induction endoscope zoom structure according to claim 4, characterized in that: The first shoulder (2-1) slides in contact with the inner surface of the outer lens tube (1), and the outer diameter of the induction coil (4) is equal to the outer diameter of the first shoulder (2-1).

6. The dual-coil induction endoscope zoom structure according to claim 1, characterized in that: One end of the endoscope tube (2) has a second shoulder (2-2) that protrudes radially inward, and the movable lens (3) is fixed on the second shoulder (2-2).

7. The dual-coil induction endoscope zoom structure according to claim 1, characterized in that: The axial length of the drive coil (6) is greater than the axial length of the induction coil (4).

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