An imaging clear three-dimensional endoscope and a focusing method thereof

Abstract

The application discloses a three-dimensional endoscope with clear imaging and a focusing method thereof, and relates to the technical field of endoscopes. The three-dimensional endoscope with clear imaging comprises a tip shell, an eyepiece tube, a metal wire, a tension member, and a pressure member. The eyepiece tube is located at one end in the tip shell and is a micro-elastic component. An eyepiece body is arranged at the other end in the eyepiece tube. The eyepiece body is wrapped with an eyepiece ring seat. The eyepiece ring seat is axially connected with the eyepiece tube through a spring. The tension member is arranged at the other end in the tip shell. The metal wire is arranged between the tension member and the eyepiece ring seat. The tension member can drive the metal wire to generate tension on the eyepiece body. The pressure member is arranged. The three-dimensional endoscope with clear imaging and the focusing method thereof can adjust the focal length by arranging the metal wire to provide tension on the eyepiece. The position of the eyepiece body is locked after focusing, so that the stability of the eyepiece body is maintained, the imaging is clear, and shaking is avoided.

Description

Technical Field

[0001] This invention relates to the field of endoscopy technology, specifically to a three-dimensional endoscope with clear imaging and its focusing method. Background Technology

[0002] Optical systems require focusing for different object distances. The conventional focusing method for endoscopes is to adjust the lens component at the front end of the CMOS (the lens component is the optical component at the front end of the endoscope, usually composed of multiple precision glass or plastic lenses, with a compact design to adapt to the narrow internal environment, collecting light reflected from the body and focusing it onto the CMOS component; CMOS is an image sensor that uses photodiodes to convert light signals into electrical signals and generates digital images through analog-to-digital conversion). This is feasible and problem-free in 2D endoscopes, but in 3D endoscopes (e.g., a device for achieving 3D imaging using a conventional endoscope proposed in patent application number CN202011634403.3), there are two imaging modules, each containing two imaging elements and two lens components. During focusing, both lens components need to be adjusted simultaneously. In actual use, due to the existence of errors, the two lens components cannot be synchronized, causing the two systems to not be clear at the same time.

[0003] In addition, existing focusing methods, such as the electronic endoscope proposed in patent application number CN201510996753.7, adjust the position of the photosensitive element in the optical path system in various ways to achieve the purpose of adjusting the focal length. However, since the position of the photosensitive element needs to be adjusted, the position of the photosensitive element is not locked. However, since different image perspectives need to be observed on the tissue, medical staff need to constantly adjust the position of the tip shell. During the adjustment process, the position of the photosensitive element will undergo slight changes, resulting in unclear images and slight image jitter. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a clear-image three-dimensional endoscope and its focusing method, solving the problem of unclear images caused by focusing in existing technologies.

[0005] To achieve the above objectives, the present invention provides a three-dimensional endoscope with clear imaging, comprising:

[0006] Terminal shell;

[0007] An eyepiece tube is located within one end of a front housing. The eyepiece tube is a slightly elastic component. An eyepiece body is provided at one end of the eyepiece tube. An eyepiece seat ring is wrapped around the eyepiece body. The eyepiece seat ring is axially connected to the eyepiece tube by a spring.

[0008] A tension member is located at the other end inside the tip housing. A metal wire is provided between the tension member and the eyepiece seat ring. Driving the tension member can cause the metal wire to exert a tension on the eyepiece body.

[0009] Pressure components, wherein at least two sets of pressure components are provided, and the pressure components are distributed in the area around the eyepiece tube opposite to the eyepiece body;

[0010] A rigid force-applying component, located inside the tip housing, is used to drive the pressure component to squeeze or not squeeze the eyepiece tube, forming two states: the eyepiece body is locked or unlocked.

[0011] Furthermore, the pressure element includes:

[0012] An assembly ring, wherein the assembly ring is confined within the tip housing;

[0013] Passive pressure blocks, which are distributed on the outer surface of the eyepiece tube;

[0014] A radial guide rod, one end of which is fixed to the inner wall of the assembly ring, and a radial guide groove is provided on the passive pressure block for the radial guide rod to be inserted;

[0015] An active pressure block is located between the assembly ring and the passive pressure block, and the rigid force-applying component is used to drive the active pressure block to squeeze or not squeeze the passive pressure block.

[0016] Furthermore, the passive pressing block is a first wedge-shaped block, the side of the first wedge-shaped block away from the eyepiece tube is an inclined surface, and the active pressing block is a second wedge-shaped block, the side of the second wedge-shaped block closer to the first wedge-shaped block is an inclined surface;

[0017] The rigid force-applying component includes a rotating shaft, which is threadedly connected to a second wedge block, so that the second wedge block can move along the axial direction of the eyepiece tube when the rotating shaft rotates.

[0018] Furthermore, the passive pressing block is an arc-shaped block, and the active pressing block is an eccentric wheel;

[0019] The rigid force-applying component includes a rotating shaft, and the eccentric wheel is fixed on the rotating shaft so that different positions of the eccentric wheel face the arc-shaped block when the rotating shaft rotates.

[0020] Furthermore, the rigid force-applying component also includes a micro motor, which is limited to one end of the eyepiece tube away from the eyepiece body by a third limiting disk, and the power end of the micro motor is fixed with a drive gear, which drives the rotating shaft to rotate after being reduced in speed by a reduction gear set.

[0021] Furthermore, the eyepiece tube is made of a high-elasticity alloy or polytetrafluoroethylene.

[0022] Furthermore, the tensile member includes:

[0023] An internal threaded block is located at one end of the tip housing away from the eyepiece body by means of a positioning plate, and the internal threaded block is internally threaded to a threaded rod.

[0024] Guide wheel, the guide wheel is used to guide the metal wire, the end of the metal wire away from the eyepiece body is fixed on the threaded rod;

[0025] A knob, which is fixed to the end of the threaded rod away from the metal wire.

[0026] Furthermore, the eyepiece tube has a through hole for the metal wire to pass through.

[0027] Furthermore, an outer tube is fixed at one end of the front housing near the eyepiece body, and an objective lens and a relay lens group are sequentially arranged inside the outer tube.

[0028] On the other hand, the present invention also provides a focusing method for use with the aforementioned three-dimensional endoscope with clear imaging, characterized by comprising the following steps:

[0029] Step 1: Use a rigid force-applying component to control the pressure component to stop squeezing the sealing tube, thus unlocking the eyepiece;

[0030] Step 2: Use the tension control wire to apply or not apply tension to the eyepiece mount ring, so that the eyepiece reaches the position of the desired focal length;

[0031] Step 3: Use a rigid force-applying component to control the pressure component to squeeze the encapsulation tube, forming a locked state for the eyepiece.

[0032] The present invention has the following beneficial effects:

[0033] (1) The three-dimensional endoscope with clear imaging and its focusing method adjust the focal length by adjusting the position of the eyepiece body in the optical path system. Compared with adjusting the two imaging mechanisms, it is more convenient and accurate, and avoids the situation where the two imaging mechanisms cannot be synchronized due to adjusting the position of the two imaging mechanisms, resulting in the two systems not being clear at the same time.

[0034] (2) The three-dimensional endoscope with clear imaging and its focusing method adjust the focal length by setting a metal wire to provide tension to the eyepiece, and setting a pressure component to lock the position of the eyepiece body after focusing, thereby maintaining the stability of the eyepiece body and keeping the imaging clear and shaky.

[0035] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0036] Figure 1 This is an external view of the present invention;

[0037] Figure 2This is an orthographic projection view of the internal structure of the front shell in Embodiment 1 of the present invention;

[0038] Figure 3 This is a cross-sectional view of the front shell in Embodiment 1 of the present invention;

[0039] Figure 4 This is a diagram showing the connection between the eyepiece tube and the imaging tube in Embodiment 1 of the present invention;

[0040] Figure 5 For the present invention Figure 4 Another perspective view;

[0041] Figure 6 This is a schematic diagram of the internal structure of the eyepiece tube in Embodiment 1 of the present invention;

[0042] Figure 7 For the present invention Figure 6 Exploded view;

[0043] Figure 8 This is a simplified structural diagram of the optical path of the present invention;

[0044] Figure 9 This is a schematic diagram showing the included angle between the two imaging optical paths of the present invention;

[0045] Figure 10 This is a diagram showing the fit between the eyepiece tube and the pressure component in Embodiment 1 of the present invention;

[0046] Figure 11 For the present invention Figure 10 Another perspective view;

[0047] Figure 12 This is a cross-sectional view of the assembly ring in Embodiment 1 of the present invention;

[0048] Figure 13 For the present invention Figure 12 Top view;

[0049] Figure 14 This is a schematic diagram of the structure of the first wedge block in Embodiment 1 of the present invention;

[0050] Figure 15 This is a schematic diagram of the structure of the second wedge block in Embodiment 1 of the present invention;

[0051] Figure 16 This is a cross-sectional view of the assembly ring in Embodiment 2 of the present invention;

[0052] Figure 17 This is a schematic diagram of the installation of the eccentric wheel in Embodiment 2 of the present invention.

[0053] In the diagram, 1. Terminal shell; 2. Outer tube; 3. Eyepiece tube; 31. Widened section; 32. Protrusion; 33. Rigid section; 4. Imaging tube; 5. Rigid force-applying component; 51. Micro motor; 52. Drive gear; 53. Reduction gear set; 54. Rotating shaft; 55. Third limiting disk; 6. Fiber optic inlet; 7. Pressure component; 71. First wedge block; 72. Radial guide rod; 73. Second wedge block; 74. Assembly ring; 75. Radial guide groove; 76. Arc block; 77. Eccentric wheel; 8. Bundle splitter; 81. 82. Second reflecting element; 83. First reflecting element; 84. Exit pupil; 85. Aperture stop; 86. Positioning disk one; 87. Baffle; 88. Inner assembly tube; 99. Tensioning component; 90. Knob; 91. Guide wheel; 92. Positioning disk two; 93. Internal threaded block; 94. Threaded rod; 15. Spring; 16. Axial guide rod; 17. Eyepiece seat ring; 18. Eyepiece body; 19. Inlet hole; 10. Metal wire; 11. CMOS assembly; 12. Objective lens; 13. Relay lens group; 14. Lens assembly. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0056] The following is based on Figures 1-17 This invention describes a clear imaging three-dimensional endoscope and its focusing method provided by embodiments of the present invention.

[0057] Please see Figures 1-15 On the one hand, embodiments of the present invention provide a three-dimensional endoscope with clear imaging, which includes optical fibers and two sets of housings.

[0058] Example 1:

[0059] Of the two sets of housings mentioned above, one is the front housing 1, which is used to house the eyepiece body 13, the beam splitter 8, and the two imaging mechanisms; the other is the outer tube 2, which is assembled at one end of the front housing 1. The outer tube 2 has an optical path system tube inside, and the optical path system tube encapsulates the objective lens 17 and the relay lens group 18, wherein the objective lens 17 is located at the end of the relay lens group 18 away from the front housing 1.

[0060] Regarding the assembly of optical fibers: an optical fiber inlet 6 is provided on one side of the front housing 1, and an inlet hole 14 is opened on one side of the portion of the outer tube 2 located inside the front housing 1. An optical cone is provided inside the optical fiber inlet 6, and the light outlet of the optical cone is coupled to one end of the optical fiber. The other end of the optical fiber enters the outer tube 2 through the inlet hole 14, and the optical fiber is located outside the optical path system tube.

[0061] Combination Figures 2-7 As shown, to facilitate the assembly of the eyepiece body 13, the eyepiece body 13 is encapsulated inside the eyepiece tube 3, and the eyepiece tube 3 is confined to one end inside the tip housing 1. The eyepiece body 13 is provided at one end of the eyepiece tube 3, and an eyepiece seat ring 12 is wrapped around the eyepiece body 13. The eyepiece body 13 is glued inside the eyepiece seat ring 12, and the eyepiece seat ring 12 is connected inside the eyepiece tube 3. The eyepiece seat ring 12 is axially connected to the eyepiece tube 3 through a spring 10. The specific installation structure of the spring 10 is as follows: a protrusion 32 is provided on the inner wall of the eyepiece tube 3, one end of the spring 10 is fixed on the protrusion 32, and the other end is fixed on the eyepiece seat ring 12. Thus, when the eyepiece seat ring 12 is subjected to axial force, the position of the eyepiece body 13 in the entire optical path will change, thereby achieving the purpose of adjusting the focal length.

[0062] Preferably, an axial guide rod 11 is sleeved in the middle of the spring 10 to ensure that the eyepiece body 13 can maintain its radial orientation while generating axial displacement.

[0063] The present invention adjusts the focal length by adjusting the position of the eyepiece body 13 in the optical path system. Compared with adjusting the two imaging mechanisms, this is more convenient and precise, and avoids the situation where the two imaging mechanisms cannot be synchronized due to adjusting their positions, resulting in the two systems not being clear at the same time.

[0064] Combination Figure 2 , Figures 5-7As shown, the aforementioned beam splitter 8 enables the formation of two images from a single objective lens 17 and a single eyepiece body 13. Specifically, the beam splitter 8 is encapsulated within a rigid section 33, one end of which is bonded to the eyepiece tube 3. The beam splitter 8 includes a positioning disk 84, an exit pupil 83 confined within the rigid section 33, a first reflective element 82 located on the side of the positioning disk 84 away from the eyepiece tube 3, and a second reflective element 81 located on the side of the first reflective element 82 near the sidewall of the rigid section 33. Two sets of aperture stops 831 are provided within the exit pupil 83. The aperture stops 831 are square holes with a side length of 1 mm, allowing light emitted from the eyepiece body 13 to pass through the two sets of aperture stops 831 respectively. The endoscopic imaging beams passing through the two sets of aperture stops 831 form two imaging beams, which are then reflected by the first reflective element 82 and the second reflective element 81 respectively before entering the imaging mechanism for imaging (see reference). Figure 8 Assume: the angle between the beams involved in endoscopic imaging is γ0, one imaging beam has an angle of γ1, and the other imaging beam has an angle of γ2. Then γ1 and γ2 Both are contained within the angle range of γ0. The angle between the two imaging beams is γ. The two imaging beams do not intersect. Therefore, the two imaging beams are beams from different perspectives of the tissue observed by the endoscope, containing different parallax information of the observed tissue (refer to...). Figure 9 ).

[0065] Optionally, the second reflective element 81 and the first reflective element 82 are circular or polygonal (the figure shows a quadrilateral structure).

[0066] Preferably, a baffle 85 is provided on the side of the exit pupil 83 near the first reflective element 82. The baffle 85 is used to reduce the loss of light emitted from the aperture stop 831.

[0067] Preferably, an inner assembly tube 86 is also provided, and after the second reflective element 81 and the first reflective element 82 are assembled in the inner assembly tube 86, they are then encapsulated in the rigid part 33.

[0068] Combination Figures 2-5 as well as Figure 8 The imaging mechanism includes an imaging tube 4, a lens component 19 and a CMOS component 16 located inside the imaging tube 4. The imaging mechanism is provided in two sets, which are respectively aligned with two sets of second reflective elements 81. The lens component 19 is used to collect light from the second reflective elements 81 and focus it onto the CMOS component 16. The CMOS component 16 serves as an image sensor, using a photodiode to convert light signals into electrical signals and generating digital images through analog-to-digital conversion.

[0069] Reference Figure 6 and Figure 7As shown, in order to enable the second reflective element 81 to be aligned with the corresponding lens assembly 19, widening portions 31 are provided on both sides of the rigid portion 33 near the end of the imaging tube 4. The second reflective element 81 is located inside the widening portion 31. The widening portion 31 and the rigid portion 33 can be fixed to the imaging tube 4 by gluing or welding.

[0070] Combination Figure 2 , Figure 5 and Figure 6 As shown, a tension member 9 is provided for focusing the eyepiece body 13. The tension member 9 is located at the other end inside the tip housing 1. A metal wire 15 is provided between the tension member 9 and the eyepiece mount ring 12. Driving the tension member 9 causes the metal wire 15 to exert a tension on the eyepiece mount ring 12. Figure 2 From the perspective shown, when the driving tension member 9 pulls the metal wire 15, the metal wire 15 pulls the eyepiece seat ring 12, the spring 10 is compressed, and the eyepiece body 13 moves to the right. When the tension member 9 no longer provides tension, due to the rebound effect of the spring 10, the eyepiece body 13 moves to the left, thereby realizing the position of the eyepiece body 13 in the entire optical path and achieving the purpose of focusing.

[0071] However, although the cooperation between the metal wire 15 and the spring 10 can adjust the position of the eyepiece body 13, in actual operation, because different image perspectives of the tissue need to be observed, medical staff need to constantly adjust the position of the tip shell 1. During the adjustment process, the spring 10 will actually undergo slight deformation, and the thin and long nature of the metal wire 15 will also cause some deformation, resulting in instability of the eyepiece body 13 during actual operation. Therefore, the three-dimensional endoscope with clear imaging provided by the present invention sets the eyepiece tube 3 as a component with micro-elasticity and equips it with corresponding pressure components 7 and rigid force application components. 5. At least two sets of pressure members 7 are provided, and the pressure members 7 are distributed in the area on the periphery of the eyepiece tube 3 opposite to the eyepiece body 13. The rigid force application member 5 is located inside the tip housing 1 and is used to drive the pressure members 7 to squeeze or not squeeze the eyepiece tube 3, forming two states: the eyepiece body 13 is locked or unlocked. Specifically, when the pressure member 7 squeezes the eyepiece tube 3, the eyepiece tube 3 can produce a slight deformation. This deformation can make the eyepiece tube 3 squeeze the eyepiece seat ring 12, so that the positions of the eyepiece seat ring 12 and the eyepiece body 13 can be locked, avoiding the situation of unclear image caused by the unstable position of the eyepiece body 13.

[0072] Therefore, the three-dimensional endoscope with clear imaging provided in this embodiment of the invention can lock the position of the eyepiece body 13 after focusing, thereby maintaining the stability of the eyepiece body 13 and keeping the imaging clear and shaky.

[0073] Combination Figure 3 , Figures 10-13As shown, specifically, the aforementioned pressure component 7 includes an assembly ring 74, a passive pressure block, a radial guide rod 72, and an active pressure block: the assembly ring 74 is confined within the tip housing 1, preferably the assembly ring 74 is glued to the tip housing 1; the pressure blocks are distributed on the outer surface of the eyepiece tube 3, but the pressure blocks and the eyepiece tube 3 have no mechanical connection, they only contact each other; one end of the radial guide rod 72 is fixed to the inner wall of the assembly ring 74; the pressure block is provided with a radial guide groove 75 for the radial guide rod 72 to be inserted; the active pressure block is located between the assembly ring 74 and the passive pressure block. When the rigid force-applying component 5 is working, it can control the action of the active pressure block, so that the active pressure block squeezes or does not squeeze the passive pressure block. When the active pressure block squeezes the passive pressure block, the passive pressure block will exert a certain pressure on the eyepiece tube 3, so that the eyepiece tube 3 will deform to a certain extent, and the eyepiece tube 3 will lock the position of the eyepiece seat ring 12. Conversely, when the active pressure block does not squeeze the passive pressure block, the eyepiece tube 3 is no longer compressed, and the eyepiece seat ring 12 is in the unlocked state. In this state, the position of the eyepiece body 13 can be adjusted by the metal wire 15.

[0074] Specifically, the passive pressure block is a first wedge block 71, with the side of the first wedge block 71 away from the eyepiece tube 3 being an inclined surface. The active pressure block is a second wedge block 73, with the side of the second wedge block 73 near the first wedge block 71 also being an inclined surface. The rigid force-applying component 5 includes a rotating shaft 54, which is rotatably mounted on the inner wall of the tip housing 1. The rotating shaft 54 ​​is threadedly connected to the second wedge block 73. When the rotating shaft 54 ​​rotates, the second wedge block 73 can move axially along the eyepiece tube 3. Figure 13 From the perspective shown, when the second wedge 73 moves to the right, the second wedge 73 gradually squeezes the first wedge 71, and the eyepiece tube 3 deforms; conversely, when the second wedge 73 moves to the left, the first wedge 71 loses pressure, and the eyepiece tube 3 recovers its deformation.

[0075] Preferably, a limiting ridge is provided axially on the second wedge block 73, and a limiting groove is provided on the assembly ring 74 to cooperate with the limiting ridge, for guiding the second wedge block 73 so that when the rotating shaft 54 ​​rotates, the second wedge block 73 can only move axially. Figure 15 A schematic diagram showing the setting of a limiting ridge on the second wedge block 73.

[0076] Combination Figures 11-13 As shown, in order to achieve the rigid force application of the rigid force application component 5, the rigid force application component 5 also includes a micro motor 51. The micro motor 51 is limited to one end of the eyepiece tube 3 away from the eyepiece body 13 by the third limiting plate 55, and the power end of the micro motor 51 is fixed with a drive gear 52. The drive gear 52 drives the rotating shaft 54 ​​to rotate after being reduced by the reduction gear set 53. When the micro motor 51 is working, it drives the drive gear 52 to rotate. After being reduced by the reduction gear set 53, the drive gear 52 can drive the rotating shaft 54 ​​to rotate.

[0077] Preferably, both the drive gear 52 and the reduction gear set 53 are made of polytetrafluoroethylene, which can reduce the weight of the endoscope.

[0078] Preferably, the micro motor 51 should be provided with a motor housing.

[0079] Furthermore, the reduction technology of the reduction gear set 53 mentioned here is a well-known technology in the prior art; for its specific structure, please refer to [reference needed]. Figure 11 I won't go into details here.

[0080] Preferably, the eyepiece tube 3 is made of a high-elasticity alloy or polytetrafluoroethylene. On the one hand, this can achieve the purpose of micro-deformation of the eyepiece tube 3 under pressure. On the other hand, the high-elasticity alloy or polytetrafluoroethylene is resistant to high temperature, ensuring that it can withstand the high temperature required for endoscope disinfection.

[0081] Combination Figure 5 and Figure 11 As shown, the aforementioned tensioning component 9 includes an internal threaded block 94, a guide wheel 92, and a knob 91. The internal threaded block 94 is positioned within the tip housing 1 at one end away from the eyepiece body 13 by a positioning disc 2 93. The internal threaded block 94 is internally threaded to a threaded rod 95. The guide wheel 92 is used to guide the metal wire 15. The end of the metal wire 15 away from the eyepiece body 13 is fixed to the threaded rod 95. The knob 91 is fixed to the end of the threaded rod 95 away from the metal wire 15.

[0082] Preferably, the guide wheel 92 is fixed to the motor housing.

[0083] In this embodiment, when the knob 91 is manually rotated, the threaded rod 95 can generate axial displacement on the internal thread block 94, thereby achieving the purpose of providing tension or not providing tension to the metal wire 15.

[0084] In the above overall structure, in order to ensure that the metal wire 15 is not obstructed, through holes are made on the third limiting plate 55, the rigid part 33, the baffle 85 and the positioning plate 84 for the metal wire 15 to pass through.

[0085] In use (operation), ① Optical path: The optical fiber is used to illuminate the objective lens 17. The light passes sequentially through the objective lens 17, the relay lens group 18, and the eyepiece body 13. The light emitted from the eyepiece body 13 can pass through two sets of aperture stops 831 respectively. The light beams passing through the two sets of aperture stops 831 are reflected by the corresponding first reflective element 82 and second reflective element 81 respectively and enter the lens component 19 in the imaging tube 4. The lens component 19 is used to collect the light from the second reflective element 81 and focus it onto the CMOS component 16. The CMOS component 16, as an image sensor, uses a photodiode to convert the light signal into an electrical signal and generates a digital image through analog-to-digital conversion.

[0086] ② Focusing: When focusing is required, the micro motor 51 is first driven (a button for controlling the operation of the micro motor 51 should be provided on the outer surface of the front housing 1). When the micro motor 51 is working, it drives the drive gear 52 to rotate. After the drive gear 52 is reduced in speed by the reduction gear set 53, it can drive the rotating shaft 54 ​​to rotate. When the rotating shaft 54 ​​rotates, the second wedge block 73 can move to the left along the eyepiece tube 3. Figure 13 From this perspective, the second wedge block 73 no longer presses against the eyepiece tube 3, thus the eyepiece tube 3 is in an unlocked state from the eyepiece seat ring 12. At this time, manually rotating the knob 91 will cause the threaded rod 95 to generate axial displacement on the internal thread block 94, thereby achieving the purpose of providing tension or not providing tension to the metal wire 15. When the metal wire 15 provides tension, the eyepiece seat ring 12 moves to the right and compresses the spring 10. Conversely, when the metal wire 15 does not provide tension, the spring 10 rebounds, and the eyepiece seat ring 12 moves to the left. After focusing is completed, the rotating shaft 54 ​​is rotated in the opposite direction by driving the micro motor 51 to work in the opposite direction, so that the second wedge block 73 can move to the right along the eyepiece tube 3. Figure 13 (From the perspective of the second wedge block 73, the second wedge block 73 presses the eyepiece tube 3, and the eyepiece tube 3 is locked to the eyepiece seat ring 12. When the operator holds the tip shell 1 and keeps changing the spatial position of the tip shell 1, the eyepiece body 13 can also be in a relatively stable state, ensuring that the image is clear and does not shake.

[0087] Example 2:

[0088] Reference Figure 16 , Figure 17 The difference between this embodiment and embodiment one is that the passive pressure block is an arc-shaped block 76, which is an arc-shaped structure with the center of the eyepiece tube 3 as the center. The active pressure block is an eccentric wheel 77, and the rigid force application component 5 includes a rotating shaft 54, with the eccentric wheel 77 fixed on the rotating shaft 54.

[0089] In this embodiment, when the rotating shaft 54 ​​rotates, the eccentric wheel 77 on it rotates accordingly, so that different positions of the eccentric wheel 77 face the arc block 76 when the rotating shaft 54 ​​rotates. When the side of the outer arc surface of the eccentric wheel 77 that is farther away from the rotating shaft 54 ​​approaches the arc block 76, the arc block 76 is in a state of squeezing the eyepiece tube 3.

[0090] On the other hand, the present invention also provides a focusing method for use with the above-mentioned clear imaging three-dimensional endoscope, comprising the following steps:

[0091] Step 1: Use the rigid force application component 5 to control the pressure component 7 to stop squeezing the eyepiece tube 3, thus unlocking the eyepiece body 13;

[0092] Step 2: Use the tensioning element 9 to control the metal wire 15 to apply or not apply tension to the eyepiece seat ring 12, so that the eyepiece body 13 reaches the position of the desired focal length;

[0093] Step 3: Use the rigid force-applying component 5 to control the pressure component 7 to squeeze the eyepiece tube 3, forming the locked state of the eyepiece body 13.

[0094] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0095] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A three-dimensional endoscope with clear imaging, characterized in that, include: Termination shell (1); Eyepiece tube (3), the eyepiece tube (3) is located at one end inside the tip shell (1), the eyepiece tube (3) is a component with micro-elasticity, the eyepiece body (13) is provided at one end inside the eyepiece tube (3), the eyepiece body (13) is surrounded by an eyepiece seat ring (12), and the eyepiece seat ring (12) is axially connected to the eyepiece tube (3) by a spring (10); A tension member (9) is located at the other end inside the front housing (1). A metal wire (15) is provided between the tension member (9) and the eyepiece seat ring (12). Driving the tension member (9) can cause the metal wire (15) to generate a tension on the eyepiece body (13). Pressure element (7), at least two sets of pressure element (7) are provided, and the pressure element (7) is distributed in the area around the eyepiece tube (3) opposite to the eyepiece body (13); A rigid force-applying component (5) is located inside the front housing (1) and is used to drive the pressure component (7) to squeeze or not squeeze the eyepiece tube (3), forming two states where the eyepiece body (13) is locked or unlocked. The pressure component (7) includes: Assembly ring (74), the assembly ring (74) being confined within the front housing (1); Passive pressure blocks are distributed on the outer surface of the eyepiece tube (3); Radial guide rod (72), one end of which is fixed to the inner wall of the assembly ring (74), and a radial guide groove (75) is provided on the passive pressure block for the radial guide rod (72) to be inserted. An active pressure block is located between the assembly ring (74) and the passive pressure block, and the rigid force-applying member (5) is used to drive the active pressure block to squeeze or not squeeze the passive pressure block; The passive pressing block is a first wedge block (71), the side of the first wedge block (71) away from the eyepiece tube (3) is an inclined surface, and the active pressing block is a second wedge block (73), the side of the second wedge block (73) close to the first wedge block (71) is an inclined surface; The rigid force-applying component (5) includes a rotating shaft (54), which is threadedly connected to a second wedge block (73) so that the second wedge block (73) can move along the axial direction of the eyepiece tube (3) when the rotating shaft (54) rotates. The rigid force-applying component (5) also includes a micro motor (51), which is limited by a third limiting plate (55) to one end of the eyepiece tube (3) away from the eyepiece body (13), and the power end of the micro motor (51) is fixed with a drive gear (52), which drives the rotating shaft (54) to rotate after being reduced in speed by a reduction gear set (53).

2. The three-dimensional endoscope with clear imaging according to claim 1, characterized in that, The eyepiece tube (3) is made of a high-elasticity alloy or polytetrafluoroethylene.

3. The three-dimensional endoscope with clear imaging according to claim 1, characterized in that: The tension member (9) includes: The internal thread block (94) is located at one end of the tip housing (1) away from the eyepiece body (13) by the positioning plate two (93), and the internal thread block (94) is internally threaded with a threaded rod (95). Guide wheel (92), the guide wheel (92) is used to guide the metal wire (15), the end of the metal wire (15) away from the eyepiece body (13) is fixed on the threaded rod (95); A knob (91) is fixed to the end of the threaded rod (95) away from the wire (15).

4. The three-dimensional endoscope with clear imaging according to claim 1, characterized in that: The eyepiece tube (3) has a through hole for the metal wire (15) to pass through.

5. A three-dimensional endoscope with clear imaging according to claim 1, characterized in that, The outer tube (2) is fixed at one end of the front shell (1) near the eyepiece body (13), and the objective lens (17) and the relay lens group (18) are arranged in sequence inside the outer tube (2).

6. A focusing method for use with the clear imaging three-dimensional endoscope of claim 1, characterized in that, Includes the following steps: Step 1: Use the rigid force application component (5) to control the pressure component (7) to stop squeezing the eyepiece tube (3), thus unlocking the eyepiece body (13); Step 2: Use the tensioning element (9) to control the wire (15) to apply or not apply tension to the eyepiece seat ring (12) so that the eyepiece body (13) reaches the position of the desired focal length; Step 3: Use the rigid force application element (5) to control the pressure element (7) to squeeze the eyepiece tube (3) to form the locked state of the eyepiece body (13).

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