High-precision anti-shake zoom structure and endoscope comprising same
By employing a combination of drive coil and image stabilization coil in the endoscope, the problems of slow response speed and shaking in the endoscope zoom structure are solved, achieving high-precision zoom and image stabilization functions.
Patent Information
- Application Number
- CN202423174943.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-23
AI Technical Summary
Existing endoscope zoom structures fail to effectively prevent radial wobble when considering the movement of moving lenses, resulting in reduced zoom accuracy.
It adopts a combination structure of drive coil and image stabilization coil, and controls the axial and radial movement of the moving lens barrel assembly through electromagnetic force. Combined with the return spring to keep the lens stable, it realizes fast zoom and image stabilization functions.
While achieving rapid zoom, it also improves the lens positioning accuracy and anti-shake capability, making it suitable for complex working environments.
Smart Images
Figure CN223539060U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and in particular to a high-precision anti-shake zoom structure and an endoscope containing the same. 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, but these often only consider how to control the movement of the moving lens without taking into account the radial wobbling of the moving lens caused by the structure of the device itself or external environmental factors. For example, the zoom structure disclosed in patent number CN115670350A uses the balance between the electromagnetic force of an electromagnet and the elastic force of a spring to stabilize the moving lens. This structure has high mobility and the moving parts do not need to be in direct contact with the fixed parts, which can reduce friction. However, because the spring has the flexibility to move, it is easy to cause the moving lens to shake, which leads to a reduction in zoom accuracy.
[0004] Therefore, it is necessary to design an endoscope zoom structure with fast response speed and image stabilization function. Utility Model Content
[0005] To address the technical problem that existing endoscope zoom structures only consider how to control the movement of the moving lens without taking into account the radial wobbling of the moving lens, resulting in lens shaking and reduced zoom accuracy, this invention provides a high-precision anti-shake zoom structure and an endoscope containing the same to solve the above problems.
[0006] This utility model proposes a high-precision image-stabilized zoom structure, including an outer lens barrel, a movable lens barrel assembly located inside the outer lens barrel, and a return spring connected to both sides of the movable lens barrel assembly. The movable lens barrel assembly includes an inner lens barrel, a movable lens fixed to the inner lens barrel, and a magnet.
[0007] A drive coil and an image stabilization coil are fixed on the outer lens barrel. The drive coil is arranged coaxially with the outer lens barrel, and the central axis of the image stabilization coil is perpendicular to the central axis of the outer lens barrel. The drive coil and the image stabilization coil are respectively connected to an external circuit. The drive coil is used to control the axial reciprocating motion of the moving lens barrel assembly, and the image stabilization coil is used to control the radial offset of the moving lens barrel assembly.
[0008] In an optional embodiment of this utility model, the magnets and the anti-shake coils are arranged in an array along the circumferential direction and correspond one-to-one.
[0009] In an optional embodiment of this utility model, the circumferential surface of the outer lens barrel is provided with a plurality of slots for fixing anti-shake coils, and the slots penetrate the surface of the outer lens barrel radially.
[0010] In an optional embodiment of this utility model, multiple drive coils are arranged along the axial direction of the outer lens barrel, each drive coil is energized simultaneously, and each drive coil is not completely in the same circuit, so that the current of each drive coil can be adjusted separately.
[0011] In an optional embodiment of this utility model, the outer peripheral surface of the endoscope tube has several grooves for fixing magnets.
[0012] In an optional embodiment of this invention, the drive coil is located on the inner surface of the outer lens barrel.
[0013] In an optional embodiment of this utility model, four anti-shake coils are arranged in an array along the circumferential direction.
[0014] This utility model also proposes an endoscope, including the high-precision image-stabilized zoom structure described above.
[0015] In an optional embodiment of this utility model, the endoscope further includes a front endoscope assembly and a rear endoscope assembly fixed at both ends of the external endoscope tube, and the ends of the two return springs are respectively connected to the front endoscope assembly and the rear endoscope assembly.
[0016] The beneficial effects of this utility model are:
[0017] (1) This utility model is equipped with both a drive coil and an anti-shake coil. The anti-shake coil controls the radial offset of the moving lens barrel assembly, while the return spring moves the moving lens barrel assembly closer to the axis, thereby achieving rapid zoom while ensuring lens stability and making it more adaptable to complex working environments.
[0018] (2) This utility model distributes multiple drive coils along the axial direction. By adjusting the magnitude of the current of each drive coil, the moving lens barrel assembly is controlled to move to the designated position, thereby improving the zoom accuracy. Attached Figure Description
[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0020] Figure 1 This is an exploded view of a specific embodiment of the endoscope described in this utility model;
[0021] Figure 2 This is an axial sectional view of a specific embodiment of the endoscope described in this utility model;
[0022] Figure 3 This is a schematic diagram showing the drive coil being energized when the endoscope described in this utility model is in a certain equilibrium state.
[0023] In the diagram, 1. Outer lens barrel, 101. Slot, 102. Boss, 2. Inner lens barrel, 201. Groove, 3. Moving lens, 4. Magnet, 4-1. First magnet, 4-2. Second magnet, 5. Return spring, 6. Drive coil, 6-1. First drive coil, 6-2. Second drive coil, 6-3. Third drive coil, 6-4. Fourth drive coil, 6-5. Fifth drive coil, 6-6. Sixth drive coil, 6-7. Seventh drive coil, 6-8. Eighth drive coil, 7. Image stabilization coil, 7-1. First image stabilization coil, 7-2. Second image stabilization coil, 8. Front lens barrel assembly, 8-1. Front lens barrel, 8-2. First lens, 8-3. Second lens, 9. Rear lens barrel assembly, 9-1. Rear lens barrel, 9-2. Third lens, 10. Moving lens barrel assembly. Detailed Implementation
[0024] 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.
[0025] Example 1
[0026] like Figure 1 and Figure 2 As shown, a high-precision image-stabilized zoom structure includes an outer lens barrel 1, a movable lens barrel assembly 10 located inside the outer lens barrel 1, and return springs 5 connected to both sides of the movable lens barrel assembly 10. The movable lens barrel assembly 10 includes an inner lens barrel 2, a movable lens 3 fixed to the inner lens barrel 2, and magnets 4. The movable lens 3 is fixed inside the inner lens barrel 2, and multiple magnets 4 are arranged outside the inner lens barrel 2. The return springs 5 are in a stretched state, and the movable lens barrel assembly 10 is suspended inside the outer lens barrel 1 by the return springs 5.
[0027] A drive coil 6 and an anti-shake coil 7 are fixed on the outer lens barrel 1. The drive coil 6 is arranged coaxially with the outer lens barrel 1, and the central axis of the anti-shake coil 7 is perpendicular to the central axis of the outer lens barrel 1. The drive coil 6 and the anti-shake coil 7 are respectively connected to an external circuit. The drive coil 6 is used to control the moving lens barrel assembly 10 to reciprocate along the axial direction, and the anti-shake coil 7 is used to control the moving lens barrel assembly 10 to deflect radially.
[0028] The drive coil 6 generates an electromagnetic force along the axial direction of the outer lens barrel 1. When the drive coil 6 is energized, it can guide the magnet 4 to deflect along the axial direction. The moving lens barrel assembly 10 maintains axial balance under the combined action of the drive coil 6 and the return spring 5.
[0029] The image stabilization coil 7 generates an electromagnetic force along the radial direction of the outer lens barrel 1. Multiple image stabilization coils 7 are arranged in the circumferential direction. When the current of the image stabilization coil 7 in a certain direction is large, it can cause the moving lens barrel assembly 10 to tilt in that direction. When the moving lens barrel assembly 10 is radially offset, the return spring 5 can apply a return force pointing towards the central axis to the moving lens barrel assembly 10, thereby keeping the moving lens barrel assembly 10 in the position of the central axis.
[0030] In an optional embodiment of this invention, the magnets 4 and the anti-shake coils 7 are arranged in a circumferential array and correspond one-to-one. When the anti-shake coil 7 is energized, it can push the magnet 4 directly opposite it radially. Therefore, the number of anti-shake coils 7 can be set according to the need for adjusting the direction.
[0031] When the endoscope is working in a shaky environment, this invention can achieve optical image stabilization. The steps for achieving optical image stabilization are described below, assuming that four image stabilization coils 7 are arranged in a circumferential array:
[0032] The radial offset of the moving lens barrel assembly 10 allows the image to move on the imaging plane, and the image stabilization coil 7 is energized when image movement is needed to counteract shaking.
[0033] Assuming it is necessary to move the lens barrel assembly 10 in Figure 3 The downward movement energizes the first image stabilization coil 7-1 located above, causing the first magnet 4-1 opposite it to experience a downward thrust. Since the two return springs 5 are in a stretched state, the moving lens barrel assembly 10 experiences a restoring force pointing towards the central axis when it undergoes radial displacement. The distance of image displacement can be controlled by adjusting the current in the first image stabilization coil 7-1. When the moving lens barrel assembly 10 needs to move upward, the second image stabilization coil 7-2 located below is energized, causing the second magnet 4-2 opposite it to experience an upward thrust.
[0034] Four image stabilization coils 7 are distributed around the moving lens barrel assembly 10, enabling the moving lens barrel assembly 10 to move in all radial directions, that is, enabling the image to move in all directions on the imaging plane.
[0035] Regarding the installation of image stabilization coil 7:
[0036] like Figure 1 and Figure 2 As shown, the circumferential surface of the endoscope tube 1 is provided with several slots 101 for fixing the image stabilization coils 7, and the slots 101 extend radially through the surface of the endoscope tube 1. The image stabilization coils 7 can be fixed to the slots 101 with glue. The slots 101 can bring the image stabilization coils 7 closer to the magnets 4, improving the response speed. At the same time, they also prevent the image stabilization coils 7 from protruding from the surface of the endoscope tube 1, thereby reducing the overall radial dimension of the endoscope.
[0037] For the installation of magnet 4:
[0038] like Figure 1 As shown, the outer circumferential surface of the endoscope tube 2 has several grooves 201 for fixing magnets 4. The grooves 201 can prevent the magnets 4 from protruding from the surface of the endoscope tube 2, so that the movable endoscope tube assembly 10 has a regular cylindrical structure, which is convenient for installation. In addition, when the size of the movable lens 3 is fixed, the embedded magnets 4 can also reduce the radial size of the endoscope.
[0039] The drive coil 6 can be disposed on the outside of the outer lens barrel 1. In this embodiment, the drive coil 6 is disposed on the inner surface of the outer lens barrel 1, such as... Figure 2 The outer lens tube 1 has a boss 102 at one end of its inner surface, and one end of the drive coil 6 is connected to the boss 102.
[0040] The drive coil 6 can be an integral structure. By adjusting the current of the drive coil 6, the electromagnetic force changes, thereby controlling the movement of the moving lens barrel assembly 10.
[0041] Example 2
[0042] The difference between this embodiment and the above embodiment is that the drive coil 6 is improved from an integral structure to multiple independent coils arranged along the axial direction of the outer lens barrel 1. Each drive coil 6 is energized at the same time, and each drive coil 6 is not completely in the same circuit, so that the current of each drive coil 6 can be adjusted separately.
[0043] By adjusting the magnitude and direction of the current in each drive coil 6, the movable lens barrel assembly 10 can be precisely moved to a designated position. The specific operating method is as follows:
[0044] The polarity direction of magnet 4 is as follows Figure 3 As shown.
[0045] The position of the movable lens barrel assembly 10, without control, is as follows: Figure 3 , which is the initial position. Each drive coil 6 in the figure is named from left to right as the first drive coil 6-1, the second drive coil 6-2, the third drive coil 6-3, the fourth drive coil 6-4, the fifth drive coil 6-5, the sixth drive coil 6-6, the seventh drive coil 6-7, and the eighth drive coil 6-8.
[0046] The drive coil 6 and the magnet 4 exert an Ampere force, driving the movable lens barrel assembly 10 to move as shown. Figure 3 At the position shown, the Ampere force is balanced with the elastic force of the return spring 5.
[0047] Subsequent adjustments Figure 3The current in multiple drive coils 6 can be adjusted, for example, by reversing the currents in the first drive coil 6-1 and the second drive coil 6-2, and increasing the currents in the seventh drive coil 6-7 and the eighth drive coil 6-8. In this case, when the moving lens assembly 10 deviates from its equilibrium position to the left (or right), the Ampere force on the moving lens assembly 10 will decrease (or increase), and the moving lens assembly 10 will return to its equilibrium position due to the force. Compared to a single-coil structure, this provides higher positioning accuracy.
[0048] Example 3
[0049] An endoscope includes the high-precision image-stabilized zoom structure described above. The endoscope typically also includes a front endoscope assembly 8 and a rear endoscope assembly 9 fixed to both ends of the outer endoscope tube 1, with the ends of two return springs 5 connected to the front endoscope assembly 8 and the rear endoscope assembly 9, respectively. Figure 1 As shown, the front lens barrel assembly 8 includes a front lens barrel 8-1 and a first lens 8-2 and a second lens 8-3 fixed inside the front lens barrel 8-1. The rear lens barrel assembly 9 includes a rear lens barrel 9-1 and a third lens 9-2 fixed inside the rear lens barrel 9-1. The front lens barrel 8-1 and the rear lens barrel 9-1 are respectively fixed to both ends of the outer lens barrel 1, and the ends of the two return springs 5 are respectively connected to the front lens barrel 8-1 and the rear lens barrel 9-1.
[0050] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "axial", "radial", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.
[0051] 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.
[0052] 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.
[0053] 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 high-precision image-stabilized zoom structure, characterized in that: It includes an outer lens tube (1), a movable lens tube assembly (10) located inside the outer lens tube (1), and a return spring (5) connected to both sides of the movable lens tube assembly (10). The movable lens tube assembly (10) includes an inner lens tube (2), a movable lens (3) fixed to the inner lens tube (2), and a magnet (4). A drive coil (6) and an anti-shake coil (7) are fixed on the outer lens barrel (1). The drive coil (6) is coaxially arranged with the outer lens barrel (1). The central axis of the anti-shake coil (7) is perpendicular to the central axis of the outer lens barrel (1). The drive coil (6) and the anti-shake coil (7) are respectively connected to an external circuit. The drive coil (6) is used to control the moving lens barrel assembly (10) to reciprocate along the axial direction. The anti-shake coil (7) is used to control the moving lens barrel assembly (10) to deflect radially.
2. The high-precision image-stabilized zoom structure according to claim 1, characterized in that: The magnet (4) and the anti-shake coil (7) are arranged in an array along the circumferential direction and correspond one to one.
3. The high-precision image-stabilized zoom structure according to claim 2, characterized in that: The outer lens barrel (1) has a number of slots (101) for fixing anti-shake coils (7) on its circumferential surface, and the slots (101) extend radially through the surface of the outer lens barrel (1).
4. The high-precision image-stabilized zoom structure according to claim 1, characterized in that: Multiple drive coils (6) are arranged along the axial direction of the outer lens barrel (1). Each drive coil (6) is energized simultaneously, and each drive coil (6) is not completely in the same circuit, so that the current of each drive coil (6) can be adjusted separately.
5. The high-precision image-stabilized zoom structure according to claim 2, characterized in that: The outer circumferential surface of the endoscope tube (2) has several grooves (201) for fixing magnets (4).
6. The high-precision image-stabilized zoom structure according to claim 2, characterized in that: The drive coil (6) is located on the inner surface of the outer lens barrel (1).
7. The high-precision image-stabilized zoom structure according to claim 2, characterized in that: The anti-shake coil (7) has four coils arranged in a circular array.
8. An endoscope, characterized in that: Includes the high-precision image-stabilized zoom structure as described in any one of claims 1-7.
9. The endoscope according to claim 8, characterized in that: The endoscope also includes a front endoscope assembly (8) and a rear endoscope assembly (9) fixed at both ends of the outer endoscope (1), and the ends of the two return springs (5) are respectively connected to the front endoscope assembly (8) and the rear endoscope assembly (9).