Three-dimensional endoscope with clear imaging and focusing method thereof

Abstract

The invention 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 capable of imaging clearly comprises a tip housing; the eyepiece tube is limited at one end in the tip shell, the eyepiece tube is a micro-elastic component, an eyepiece main body is arranged at one end in the eyepiece tube, an eyepiece seat ring wraps the periphery of the eyepiece main body, and an eyepiece ring seat is axially connected with the eyepiece tube through a spring; the tension piece is located at the other end in the tip shell, a metal wire is arranged between the tension piece and the eyepiece seat ring, and the tension piece is driven to enable the metal wire to generate tension on the eyepiece main body; a pressure piece; according to the three-dimensional endoscope capable of imaging clearly and the focusing method thereof, the metal wire is arranged to provide tensile force for the eyepiece to adjust the focal length, and the pressure piece is arranged to lock the position of the eyepiece main body after focusing, so that the stability of the eyepiece main body is maintained, and the imaging is kept clear and does not shake.

Description

Technical Field

[0001] The present invention relates to the technical field of endoscopes, and specifically to a three-dimensional endoscope with clear imaging and its focusing method. Background Art

[0002] The optical system needs to focus for different object distances. The conventional focusing method for endoscopes is to adjust the lens assembly at the front end of the CMOS (the lens assembly is a lens, which is the optical component at the front end of the endoscope, usually composed of multiple pieces of precision glass or plastic lenses, designed to be compact to fit the narrow internal environment of the body, collect the light reflected inside the body and focus it on 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 can be achieved and there is no problem on 2D endoscopes. However, on three-dimensional endoscopes (for example, a device for achieving three-dimensional imaging using a conventional endoscope proposed in the patent with application number CN202011634403.3), there are two imaging modules, and each imaging module contains two imaging elements and two lens assemblies. During the focusing process, it is necessary to adjust the two lens assemblies simultaneously. In actual use, due to the existence of errors, the two lens assemblies cannot be synchronized, resulting in the inability of the two-channel systems to be clear simultaneously.

[0003] In addition, for the existing focusing methods, such as the electronic endoscope proposed in the patent with application number CN201510996753.7, which adjusts 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, due to the need to observe different image perspectives of tissues, medical staff need to continuously adjust the position of the distal end housing. During the adjustment process, the position of the photosensitive element will change slightly, resulting in unclear images and slight image jitter. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a three-dimensional endoscope with clear imaging and its focusing method, which solves the problem of unclear images caused by focusing in the prior art.

[0005] To achieve the above objectives, on the one hand, the present invention provides a three-dimensional endoscope with clear imaging, including: A distal end housing; An eyepiece tube, which is limited at one end inside the distal end housing. The eyepiece tube is a member with micro-elasticity. An eyepiece body is provided at one end inside the eyepiece tube, and an eyepiece seat ring is wrapped around the periphery of the eyepiece body. The eyepiece ring seat is axially connected to the eyepiece tube through a spring; A tension member, which is located at the other end inside the distal end 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 generate a tension force on the eyepiece body; Pressure members, at least two groups of the pressure members are provided, and the pressure members are distributed in the area opposite to the eyepiece body around the eyepiece tube; Rigid force-applying member, the rigid force-applying member is located inside the tip housing and is used to drive the pressure member to squeeze or not squeeze the eyepiece tube, forming two states where the eyepiece body is locked or unlocked.

[0006] Further, the pressure member includes: Assembly ring, the assembly ring is limited inside the tip housing; Passive pressing block, the passive pressing blocks are distributed on the outer surface of the eyepiece tube; Radial guide rod, one end of the radial guide rod is fixedly arranged on the inner wall of the assembly ring, and a radial guide groove for inserting the radial guide rod is provided on the passive pressing block; Active pressing block, the active pressing block is located between the assembly ring and the passive pressing block, and the rigid force-applying member is used to drive the active pressing block to squeeze or not squeeze the passive pressing block.

[0007] Further, the passive pressing block is a first wedge-shaped block, one side of the first wedge-shaped block away from the eyepiece tube is an inclined surface, the active pressing block is a second wedge-shaped block, and one side of the second wedge-shaped block close to the first wedge-shaped block is an inclined surface; The rigid force-applying member includes a rotating shaft, the rotating shaft is threadedly connected to the second wedge-shaped block, so that the second wedge-shaped block can move along the axial direction of the eyepiece tube when the rotating shaft rotates.

[0008] Further, the passive pressing block is an arc-shaped block, and the active pressing block is an eccentric wheel; The rigid force-applying member 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.

[0009] Further, the rigid force-applying member further includes a micro-motor, the micro-motor is limited at one end of the eyepiece tube far from the eyepiece body through a third limiting disk, and a driving gear is fixedly arranged at the power end of the micro-motor, and the driving gear drives the rotating shaft to rotate after being decelerated by a reduction gear set.

[0010] Further, the eyepiece tube is made of high-elastic alloy or polytetrafluoroethylene.

[0011] Further, the tension member includes: Internal thread block, the internal thread block is limited at one end of the tip housing far from the eyepiece body through a positioning disk two, and a threaded rod is threadedly connected inside the internal thread block; Guide wheel, the guide wheel is used to guide the metal wire, and one end of the metal wire far from the eyepiece body is fixedly arranged on the threaded rod; Knob, the knob is fixed at one end of the threaded rod far from the metal wire.

[0012] Further, a through hole for the metal wire to pass through is formed on the eyepiece tube.

[0013] Further, an outer tube is fixedly provided at one end of the tip housing close to the eyepiece body, and an objective lens and a relay lens group are sequentially arranged inside the outer tube.

[0014] On the other hand, the present invention also provides a focusing method for the three-dimensional endoscope with clear imaging as described above, which is characterized by including the following steps: Step 1: Use a rigid force-applying member to control the pressure member to no longer squeeze the encapsulation tube, forming an unlocked state of the eyepiece; Step 2: Use a pulling member to control the metal wire to apply or not apply a pulling force to the eyepiece seat ring, so that the eyepiece reaches the position with the required focal length; Step 3: Use a rigid force-applying member to control the pressure member to squeeze the encapsulation tube, forming a locked state of the eyepiece.

[0015] The present invention has the following beneficial effects: (1) For the three-dimensional endoscope with clear imaging and its focusing method, the focal length is adjusted 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 that the two imaging mechanisms cannot be synchronized due to adjusting the positions of the two imaging mechanisms, resulting in the two systems not being clear at the same time.

[0016] (2) For the three-dimensional endoscope with clear imaging and its focusing method, the focal length is adjusted by setting the metal wire to provide a pulling force to the eyepiece, and a pressure member is provided to lock the position of the eyepiece body after focusing, so as to maintain the stability of the eyepiece body and keep the imaging clear and non-vibrating.

[0017] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the external view of the present invention; Figure 2 is the front projection view of the internal structure of the tip housing in the first embodiment of the present invention; Figure 3 is the sectional view of the tip housing in the first embodiment of the present invention; Figure 4 is the docking view of the eyepiece tube and the imaging tube in the first embodiment of the present invention; Figure 5 is the present invention Figure 4 from another perspective; Figure 6 is the schematic diagram of the internal structure of the eyepiece tube in the first embodiment of the present invention; Figure 7 is the present invention Figure 6 exploded view; Figure 8 is a structural schematic diagram of the optical path of the present invention; Figure 9 is a schematic diagram of the included angle between two imaging optical paths of the present invention; Figure 10 is a mating diagram of the eyepiece tube and the pressure member in the first embodiment of the present invention; Figure 11 for the present invention Figure 10 view from another perspective; Figure 12 is a sectional view of the assembly ring in the first embodiment of the present invention; Figure 13 for the present invention Figure 12 top view; Figure 14 is a structural schematic diagram of the first wedge block in the first embodiment of the present invention; Figure 15 is a structural schematic diagram of the second wedge block in the first embodiment of the present invention; Figure 16 is a sectional view of the assembly ring in the second embodiment of the present invention; Figure 17 is an installation schematic diagram of the eccentric wheel in the second embodiment of the present invention.

[0019] In the figure, 1, tip housing; 2, outer tube; 3, eyepiece tube; 31, widened part; 32, convex part; 33, rigid part; 4, imaging tube; 5, rigid force-applying member; 51, micro motor; 52, driving gear; 53, reduction gear set; 54, rotating shaft; 55, third limiting disk; 6, optical fiber inlet; 7, pressure member; 71, first wedge block; 72, radial guide rod; 73, second wedge block; 74, assembly ring; 75, radial guide groove; 76, arc-shaped block; 77, eccentric wheel; 8, beam splitter; 81, second reflecting element; 82, first reflecting element; 83, exit pupil; 831, aperture stop; 84, positioning disk one; 85, baffle; 86, inner assembly tube; 9, tension member; 91, knob; 92, guide wheel; 93, positioning disk two; 94, internal thread block; 95, threaded rod; 10, spring; 11, axial guide rod; 12, eyepiece seat ring; 13, eyepiece body; 14, access hole; 15, wire; 16, cmos component; 17, objective lens; 18, relay lens group; 19, lens component. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] In the description of the present invention, it should be understood that the terms "open hole", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0022] The following is based on Figures 1 - 17 to describe the three-dimensional endoscope with clear imaging and its focusing method provided by the embodiments of the present invention.

[0023] Please refer to Figures 1 - 15 , on the one hand, the embodiments of the present invention provide a three-dimensional endoscope with clear imaging, which includes an optical fiber and two groups of housings.

[0024] Embodiment 1: Among the above two groups of housings, one is the tip housing 1, which is used to accommodate the eyepiece body 13, the beam splitter 8 and two imaging mechanisms; the other is the outer tube 2, which is assembled at one end of the tip housing 1. An optical path system tube is provided inside the outer tube 2, and an objective lens 17 and a relay lens group 18 are encapsulated inside the optical path system tube, where the objective lens 17 is located at one end of the relay lens group 18 away from the tip housing 1.

[0025] Regarding the assembly of the optical fiber: a fiber entrance 6 is provided on one side of the tip housing 1. An access hole 14 is opened on one side of the part of the outer tube 2 located inside the tip housing 1. A light cone is provided inside the fiber entrance 6. The light exit of the light cone is coupled to one end of the optical fiber. The other end of the optical fiber enters the outer tube 2 through the access hole 14, and the optical fiber is located outside the optical path system tube.

[0026] Combined with Figures 2 - 7 as shown, for the convenience of assembling the eyepiece body 13, the eyepiece body 13 is encapsulated in the eyepiece tube 3, and the eyepiece tube 3 is limited to one end inside the tip housing 1. The eyepiece body 13 is provided at one end inside the eyepiece tube 3. The periphery of the eyepiece body 13 is wrapped with an eyepiece seat ring 12. The eyepiece body 13 is glued inside the eyepiece seat ring 12. The eyepiece seat ring 12 is connected inside the eyepiece tube 3, and 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: a convex part 32 is provided on the inner wall of the eyepiece tube 3. One end of the spring 10 is fixed on the convex part 32, and the other end is fixed on the eyepiece seat ring 12. Thus, when the eyepiece seat ring 12 is subjected to an axial force, the position of the eyepiece body 13 in the entire optical path will change, so as to achieve the purpose of adjusting the focal length.

[0027] Preferably, an axial guide rod 11 is sleeved in the middle of the spring 10, so as to ensure that the eyepiece body 13 can maintain its radial orientation while generating an axial displacement.

[0028] 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, it is more convenient and accurate, avoiding the situation where the two imaging mechanisms cannot be synchronized due to adjusting the positions of the two imaging mechanisms, resulting in the two systems not being clear simultaneously.

[0029] Combined with Figure 2 、 Figures 5 - 7 As shown, the beam splitter 8 can achieve the purpose of forming two images with a single-path objective lens 17 and a single-path eyepiece body 13. Specifically, the beam splitter 8 is encapsulated in the rigid part 33. One end of the rigid part 33 is glued to the eyepiece tube 3. The beam splitter 8 includes an exit pupil 83 limited in the rigid part 33 through a positioning disk 84, a first reflection element 82 provided on the side of the positioning disk 84 away from the eyepiece tube 3, and a second reflection element 81 located on the side of the first reflection element 82 close to the side wall of the rigid part 33. Two sets of aperture diaphragms 831 are arranged in the exit pupil 83. The aperture diaphragms 831 are square holes with a side length of 1 mm. Thus, the light rays emitted from the eyepiece body 13 can respectively pass through the two sets of aperture diaphragms 831. The endoscope imaging light beams passing through the two sets of aperture diaphragms 831 form two sets of imaging light beams, and enter the imaging mechanism for imaging after being reflected by the first reflection element 82 and the second reflection element 81 respectively (refer to Figure 8 ). Assume that the included angle of the light beams participating in endoscope imaging is γ0, the included angle of one imaging light beam is γ1, and the included angle of the other imaging light beam is γ2. Then γ1 and γ2 are both included within the included angle range of γ0. The included angle between the two sets of imaging light beams is γ, and the two sets of imaging light beams do not intersect. Then the two sets of imaging light beams are light beams from different perspectives of the tissue observed by the endoscope, containing different parallax information of the observed tissue (refer to Figure 9 ).

[0030] Optionally, the second reflection element 81 and the first reflection element 82 are circular or polygonal (shown as a quadrilateral structure in the figure).

[0031] Preferably, a baffle 85 is arranged on the side of the exit pupil 83 close to the first reflection element 82. The baffle 85 is used to reduce the loss of the light rays emitted from the aperture diaphragm 831.

[0032] Preferably, an inner assembly tube 86 is also provided. After the second reflection element 81 and the first reflection element 82 are assembled in the inner assembly tube 86, they are then encapsulated in the rigid part 33.

[0033] Combined with Figures 2 - 5 and Figure 8, the above imaging mechanism includes an imaging tube 4, a lens assembly 19 and a CMOS assembly 16 located inside the imaging tube 4. There are two sets of imaging mechanisms, which are respectively aligned with two sets of second reflecting elements 81. The lens assembly 19 is used to collect the light from the second reflecting elements 81 and focus it on the CMOS assembly 16. The CMOS assembly 16 serves as an image sensor, uses photodiodes to convert optical signals into electrical signals, and generates digital images through analog-to-digital conversion.

[0034] Referring to Figure 6 and Figure 7 As shown, in order to enable the second reflecting element 81 to be aligned with the corresponding lens assembly 19, widening portions 31 are provided on both sides of one end of the rigid portion 33 close to the imaging tube 4. The second reflecting element 81 is located within the widening portions 31. The widening portions 31 and the rigid portion 33 can be fixed to the imaging tube 4 by gluing or welding.

[0035] Combined with Figure 2 , Figure 5 and Figure 6 As shown, in order to focus the eyepiece body 13, a tension member 9 is provided. The tension member 9 is located at the other end inside the tip housing 1. A wire 15 is provided between the tension member 9 and the eyepiece seat ring 12. Driving the tension member 9 can cause the wire 15 to generate a tension on the eyepiece seat ring 12. In the Figure 2 view shown, when the tension member 9 is driven to pull the wire 15, the 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 resilience 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.

[0036] However, although the cooperation between the wire 15 and the spring 10 can adjust the position of the eyepiece body 13, during actual operation, since different image perspectives of tissues need to be observed, medical staff need to continuously adjust the position of the distal end housing 1. During the adjustment process, the spring 10 will actually have minute deformations. Coupled with the slender characteristics of the wire 15, it will also have certain deformations, resulting in the 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 member with micro-elasticity, and is equipped with corresponding pressure members 7 and rigid force-applying members 5. At least two groups of pressure members 7 are provided, and the pressure members 7 are distributed in the area opposite to the eyepiece body 13 on the periphery of the eyepiece tube 3. The rigid force-applying member 5 is located in the distal end housing 1 and is used to drive the pressure member 7 to squeeze or not squeeze the eyepiece tube 3, forming two states in which the eyepiece body 13 is locked or unlocked. Specifically, when the pressure member 7 squeezes the eyepiece tube 3, the eyepiece tube 3 can generate a small amount of deformation, and this deformation can cause the eyepiece tube 3 to 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 unclear image caused by the instability of the position of the eyepiece body 13.

[0037] Therefore, the three-dimensional endoscope with clear imaging provided by the embodiments of the present 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 non-shaking.

[0038] Combined with Figure 3 、 Figures 10 - 13 As shown, specifically, the above-mentioned pressure member 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 limited in the distal end housing 1. Preferably, the assembly ring 74 is glued in the distal end housing 1. The pressure blocks are distributed on the outer surface of the eyepiece tube 3, but there is no mechanical connection between the pressure blocks and the eyepiece tube 3, and the two only contact. One end of the radial guide rod 72 is fixedly arranged on 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 insert. The active pressure block is located between the assembly ring 74 and the passive pressure block. When the rigid force-applying member 5 works, 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 generates a certain deformation, and the eyepiece tube 3 will lock the position of the eyepiece seat ring 12. On the contrary, when the active pressure block does not squeeze the passive pressure block, the eyepiece tube 3 is no longer pressed, and the eyepiece seat ring 12 is in an unlocked state. In this state, the position of the eyepiece body 13 can be adjusted through the wire 15.

[0039] Specifically, the above-mentioned passive pressing block is the first wedge block 71. The side of the first wedge block 71 away from the eyepiece tube 3 is an inclined surface. The active pressing block is the 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 member 5 includes a rotating shaft 54. The rotating shaft 54 is rotatably installed 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 along the axial direction of the eyepiece tube 3. When Figure 13 viewed from the perspective shown, when the second wedge block 73 moves to the right, the second wedge block 73 gradually presses the first wedge block 71, causing the eyepiece tube 3 to deform; conversely, when the second wedge block 73 moves to the left, the first wedge block 71 loses pressure and the eyepiece tube 3 returns to its original shape.

[0040] Preferably, a limiting ridge is arranged axially on the second wedge block 73, and a limiting groove matching the limiting ridge is arranged on the assembly ring 74 for guiding the second wedge block 73, so that when the rotating shaft 54 rotates, the second wedge block 73 can only move axially. Refer to Figure 15 which is a schematic diagram of the limiting ridge arranged on the second wedge block 73.

[0041] Combined with Figures 11 - 13 shown, in order to achieve the rigid force application of the rigid force-applying member 5, the above-mentioned rigid force-applying member 5 further includes a micro-motor 51. The micro-motor 51 is limited at one end of the eyepiece tube 3 far from the eyepiece body 13 through a third limiting disk 55, and a driving gear 52 is fixedly arranged at the power end of the micro-motor 51. The driving gear 52 drives the rotating shaft 54 to rotate after being decelerated by a reduction gear set 53. When the micro-motor 51 works, it drives the driving gear 52 to rotate, and the driving gear 52 can drive the rotating shaft 54 to rotate after being decelerated by the reduction gear set 53.

[0042] Preferably, both the driving gear 52 and the reduction gear set 53 are made of polytetrafluoroethylene, so as to reduce the weight of the endoscope.

[0043] Preferably, the micro-motor 51 should be provided with a motor housing.

[0044] In addition, the deceleration technology of the reduction gear set 53 mentioned here is a well-known technology in the prior art. For the specific structure, refer to Figure 11 and will not be elaborated here.

[0045] Preferably, the above-mentioned eyepiece tube 3 is made of high-elastic alloy or polytetrafluoroethylene. On the one hand, it can achieve the purpose of slight deformation of the eyepiece tube 3 under pressure. On the other hand, the high-elastic alloy or polytetrafluoroethylene is heat-resistant, ensuring that it can withstand the high temperature required for endoscope disinfection.

[0046] Combined with Figure 5 and Figure 11As shown in the figure, the above-mentioned tension member 9 includes an internal thread block 94, a guide wheel 92 and a knob 91. The internal thread block 94 is limited at one end of the distal end housing 1 away from the eyepiece body 13 through a second positioning disk 93, and a threaded rod 95 is threadedly connected inside the internal thread block 94. The guide wheel 92 is used to guide the metal wire 15. One end of the metal wire 15 away from the eyepiece body 13 is fixed on the threaded rod 95, and the knob 91 is fixed at the end of the threaded rod 95 away from the metal wire 15.

[0047] Preferably, the guide wheel 92 is fixed on the motor housing.

[0048] In this embodiment, when the knob 91 is manually rotated, the threaded rod 95 can generate an axial displacement on the internal thread block 94, so as to achieve the purpose of providing or not providing tension to the metal wire 15.

[0049] In the above overall structure, in order to ensure that the metal wire 15 is not blocked, through holes for the metal wire 15 to pass through are opened on the third limiting disk 55, the hard part 33, the baffle 85 and the first positioning disk 84.

[0050] During use (operation), ① Optical path: The optical fiber is used to illuminate the objective lens 17, and the light passes through the objective lens 17, the relay lens group 18 and the eyepiece body 13 in sequence. The light emitted from the eyepiece body 13 can respectively pass through two sets of aperture diaphragms 831. The light beams passing through the two sets of aperture diaphragms 831 enter the lens assembly 19 in the imaging tube 4 after being reflected by the corresponding first reflection element 82 and second reflection element 81 respectively. The lens assembly 19 is used to collect the light from the second reflection element 81 and focus it on the cmos assembly 16. The cmos assembly 16 serves as an image sensor, converts the optical signal into an electrical signal using a photodiode, and generates a digital image through analog-to-digital conversion.

[0051] ② Focus adjustment: When focus adjustment is required, first drive the micro-motor 51 (a button for controlling the operation of the micro-motor 51 should be provided on the outer surface of the distal end housing 1. When the micro-motor 51 operates, it drives the driving gear 52 to rotate. After being decelerated by the reduction gear set 53, the driving gear 52 can drive the rotating shaft 54 to rotate. When the rotating shaft 54 rotates, the second wedge block 73 can move leftward along the eyepiece tube 3 ( Figure 13In this perspective, the second wedge block 73 no longer presses against the eyepiece tube 3, so that the eyepiece tube 3 is in a state of unlocking the eyepiece seat ring 12. At this time, manually rotate the knob 91, and the threaded rod 95 can generate an axial displacement on the internally threaded block 94, so as to achieve the purpose of applying or not applying tension to the wire 15. When the wire 15 applies tension, the eyepiece seat ring 12 moves to the right and compresses the spring 10. On the contrary, when the wire 15 does not apply tension, the spring 10 rebounds and the eyepiece seat ring 12 moves to the left. After focusing is completed, the drive micro-motor 51 is operated in the reverse direction again to make the rotating shaft 54 rotate in the reverse direction, so that the second wedge block 73 can move to the right along the eyepiece tube 3 ( Figure 13 In this perspective, the second wedge block 73 presses against the eyepiece tube 3, and the eyepiece tube 3 is in a state of locking the eyepiece seat ring 12. When the operator holds the tip housing 1 and continuously changes the spatial position of the tip housing 1, the eyepiece body 13 can also be in a relatively stable state, ensuring clear and non-shaking images.

[0052] Embodiment 2: Refer to Figure 16 、 Figure 17 In this embodiment, the difference from Embodiment 1 is that the above-mentioned passive pressing block is an arc block 76, the arc block 76 is an arc structure with the center of the eyepiece tube 3 as the center of the circle, the active pressing block is an eccentric wheel 77, and the rigid force-applying member 5 includes a rotating shaft 54, and the eccentric wheel 77 is fixed on the rotating shaft 54.

[0053] In this implementation scheme, when the rotating shaft 54 rotates, the eccentric wheel 77 thereon 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 far from the rotating shaft 54 approaches the arc block 76, the arc block 76 is in a state of pressing against the eyepiece tube 3.

[0054] On the other hand, the present invention also provides a focusing method for use in the above-mentioned three-dimensional endoscope with clear imaging, including the following steps: Step 1: Use the rigid force-applying member 5 to control the pressure member 7 not to press against the eyepiece tube 3 to form an unlocked state of the eyepiece body 13; Step 2: Use the tension member 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 required focal length; Step 3: Use the rigid force-applying member 5 to control the pressure member 7 to press against the eyepiece tube 3 to form a locked state of the eyepiece body 13.

[0055] It should be noted that, in this document, relational terms such as first and second are used solely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0056] The preferred embodiments of the present invention disclosed above are only used to assist in the description of the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A three-dimensional endoscope with clear imaging, characterized in that: include: Tip housing (1); An eyepiece tube (3), the eyepiece tube (3) being limited at one end inside the front end housing (1), the eyepiece tube (3) being a component having slight elasticity, an eyepiece body (13) being provided at one end inside the eyepiece tube (3), an eyepiece seat ring (12) being wrapped around the outer periphery of the eyepiece body (13), and the eyepiece ring seat (12) being axially connected to the eyepiece tube (3) via a spring (10); A tension piece (9), the tension piece (9) being located at the other end of the front end housing (1), a metal wire (15) being arranged between the tension piece (9) and the eyepiece seat ring (12), and driving the tension piece (9) can cause the metal wire (15) to generate a pulling force on the eyepiece body (13); Pressure pieces (7), wherein at least two groups of the pressure pieces (7) are provided, and the pressure pieces (7) are distributed in an area on the periphery of the eyepiece tube (3) and opposite to the eyepiece body (13); A hard force-applying member (5) is located in the front end housing (1) and is used to drive the pressure member (7) to squeeze or not squeeze the eyepiece tube (3), thereby forming two states of the eyepiece body (13) being locked or unlocked.

2. A three-dimensional endoscope with clear imaging according to claim 1, characterized in that: The pressure member (7) comprises: An assembly ring (74), the assembly ring (74) being located within the front end housing (1); Passive pressing blocks, the passive pressing blocks being distributed on the outer surface of the eyepiece tube (3); A radial guide rod (72), one end of the radial guide rod (72) being fixedly mounted on the inner wall of the assembly ring (74), and a radial guide groove (75) for inserting the radial guide rod (72) being provided on the passive pressure block; An active pressing block, the active pressing block being located between the assembly ring (74) and the passive pressing block, and the hard force applying member (5) being used to drive the active pressing block to press or not press the passive pressing block.

3. A three-dimensional endoscope with clear imaging according to claim 2, characterized in that: The passive pressing block is a first wedge-shaped block (71), a side of the first wedge-shaped block (71) away from the eyepiece tube (3) is an inclined surface, and the active pressing block is a second wedge-shaped block (73), a side of the second wedge-shaped block (73) close to the first wedge-shaped block (71) is an inclined surface; The hard force-applying member (5) comprises a rotating shaft (54), and the rotating shaft (54) is threadedly connected to the second wedge-shaped block (73), so that when the rotating shaft (54) rotates, the second wedge-shaped block (73) can move along the axial direction of the eyepiece tube (3).

4. The three-dimensional endoscope with clear imaging according to claim 2, characterized in that: The passive pressure block is an arc-shaped block (76), and the active pressure block is an eccentric wheel (77); The hard force-applying member (5) comprises a rotating shaft (54), and the eccentric wheel (77) is fixed on the rotating shaft (54) so ​​that different positions of the eccentric wheel (77) face the arc block (76) when the rotating shaft (54) rotates.

5. A three-dimensional endoscope with clear imaging according to claim 3 or 4, characterized in that: The hard force-applying member (5) further comprises a micromotor (51), the micromotor (51) being limited at one end of the eyepiece tube (3) away from the eyepiece body (13) by a third limiting plate (55), and a driving gear (52) being fixedly arranged at a power end of the micromotor (51), the driving gear (52) being decelerated by a reduction gear set (53) and driving the rotating shaft (54) to rotate.

6. A three-dimensional endoscope with clear imaging according to claim 5, characterized in that: The eyepiece tube (3) is made of a high-elastic alloy or polytetrafluoroethylene.

7. The three-dimensional endoscope with clear imaging according to claim 5, characterized in that: The tension member (9) comprises: An internal thread block (94), the internal thread block (94) being limited by a second positioning plate (93) at one end of the front end housing (1) away from the eyepiece body (13), and the internal thread of the internal thread block (94) being connected to a threaded rod (95); A guide wheel (92), the guide wheel (92) being used to guide the metal wire (15), wherein one end of the metal wire (15) away from the eyepiece body (13) is fixedly mounted on the threaded rod (95); A knob (91) is fixed to an end of the threaded rod (95) away from the metal wire (15).

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

9. The three-dimensional endoscope with clear imaging according to claim 1, characterized in that: An outer tube (2) is fixedly provided at one end of the front end housing (1) close to the eyepiece body (13), and an objective lens (17) and a relay lens group (18) are sequentially arranged inside the outer tube (2).

10. A focusing method, used in the three-dimensional endoscope with clear imaging as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Use a hard force-applying member (5) to control the pressure member (7) so that the pressure member (7) no longer presses the eyepiece tube (3), thereby forming an unlocked state of the eyepiece body (13); Step 2: Using the tension member (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; Step 3: Use the hard force-applying member (5) to control the pressure member (7) to squeeze the eyepiece tube (3), thereby forming a locked state of the eyepiece body (13).

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