Adjustable binocular lens tube and surgical microscope

Abstract

An adjustable binocular lens tube, comprising a connection seat component, an interpupillary distance adjustment sheet (2) connected to the connection seat component, an eyepiece lens tube holder (3) connected to the interpupillary distance adjustment sheet (2), and an eyepiece lens tube component connected to the eyepiece lens tube holder (3), wherein an aperture (100) is formed in the connection seat component, the eyepiece lens tube component is connected to the eyepiece lens tube holder (3) via an adjustment mechanism, the adjustment mechanism comprises an adjustment ring (60) connected to the eyepiece lens tube holder (3) and axially movable relative to the eyepiece lens tube holder (3), the eyepiece lens tube component is connected to the adjustment ring (60), and an optical lens (4) capable of being cut in or out of the aperture is provided in the connection seat component. By adjusting the binocular lens tube during the use of the surgical microscope, a comfortable posture is provided for the doctor, enabling the doctor to always concentrate on high-precision work, meeting the usage needs of different doctors, and working in a posture based on ergonomics to reduce fatigue during the use of the surgical microscope.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and specifically relates to an adjustable binocular lens tube and a surgical microscope.

Background Art

[0002] Currently, the use of surgical microscopes is becoming increasingly widespread, and they are used not only in complex clinical surgeries but also in many treatments such as restorative dentistry, endodontics, periodontology, and microsurgery. For ergonomic reasons, the position and size of the surgical microscope need to be adjusted based on the correct working position of the operator so as to obtain optimal muscle and visual working conditions.

[0003] The main mirror part of a surgical microscope generally includes a mirror body, a binocular lens tube, an eyepiece, a large zoom objective lens, a handle, etc. In most surgeries, the lens of the surgical microscope should be positioned in a horizontal position, and at this time, the doctor observes through the binocular lens tube. The basic principle of the binocular lens tube is to use a set of prism systems to split the image formed by the objective lens into two on the left and right, and observe them with two eyepieces respectively. The magnification difference between the two lens tubes should not exceed 2 - 2.5%. The images formed by the two lens tubes should be consistent in direction, and the relative inclination should not exceed 20″ - 30″. The divergence angle of the two optical axes in the horizontal plane should be within 40″, and the convergence angle of the two optical axes in the horizontal plane should be within 20″. The brightness and field of view of the images of the two lens tubes should be consistent.

[0004] For surgeons in various departments, muscle pain and tension caused by long-term use of surgical microscopes are common workplace phenomena. 78% of neurosurgeons complain of pain after a day of surgery, and 83% of them suffer from musculoskeletal pain. Prolonged surgery and high mental concentration can place a heavy burden on the surgeon's body. For example, every time the head is moved forward by 1 inch (2.54 cm), the muscles of the head, neck, and upper back must compensate to support an additional 10 pounds (4536 grams) of weight. Such a compromising posture is likely to cause pain and may spread to the arms and local areas, thus causing headaches, chronic pain, and fatigue.

[0005] In the binocular eyepiece tube of a conventional surgical microscope, the length of the eyepiece is short and non-adjustable, so it cannot adapt to the surgical postures of different surgeons, increasing the tension of the muscles in the waist, neck, and shoulders. It does not conform to the ergonomic design and affects the surgical efficiency.

Summary of the Invention

[0006] The object of the present invention is to provide an adjustable binocular eyepiece tube.

[0007] To achieve the above object, the technical solution adopted in the present invention is: An adjustable binocular eyepiece tube comprising a connection seat component, an interpupillary distance adjustment sheet connected to the connection seat component, an eyepiece tube holder connected to the interpupillary distance adjustment sheet, and an eyepiece tube component connected to the eyepiece tube holder. A light hole is opened in the connection seat component. The eyepiece tube component is connected to the eyepiece tube holder via an adjustment mechanism. The adjustment mechanism includes an adjustment ring that is connected to the eyepiece tube holder and is movable in the axial direction with respect to the eyepiece tube holder. The eyepiece tube component is connected to the adjustment ring, and the connection seat component is provided with an optical lens that can cut into or cut out of the light aperture.

[0008] In the above technical solution, preferably, the binocular eyepiece tube has a first use state in which the adjustment ring moves to a first set position in a direction away from the eyepiece tube holder and the optical lens cuts into the light aperture, and a second use state in which the adjustment ring moves to a second set position in a direction approaching the eyepiece tube holder and the optical lens cuts out of the light aperture. That is, the binocular eyepiece tube realizes two-stage adjustment. The binocular eyepiece tube has a third use state in which the optical lens cuts out of the light aperture and the adjustment ring moves to a first set position in a direction away from the eyepiece tube holder, and a fourth use state in which the optical lens cuts into the light aperture and the adjustment ring moves to a second set position in a direction approaching the eyepiece tube holder.

[0009] More preferably, one end of the adjustment ring is inserted into the inside of one end of the eyepiece tube holder, and the adjustment ring can extend out of the eyepiece tube holder or retract into the eyepiece tube holder movably. The eyepiece tube component is connected to the other end of the adjustment ring.

[0010] Even more preferably, the eyepiece tube component is inserted into the other end of the adjustment ring, and a sleeve is provided between the eyepiece tube component and the adjustment ring. The sleeve is preferably made of copper for connecting the eyepiece tube component, such as for plugging and unplugging connection.

[0011] More preferably, it further includes a first limit ring, the first limit ring is connected to one end of the eyepiece tube holder, when in the first set position, the adjustment ring moves until one end of the adjustment ring abuts against the first limit ring and extends out from the eyepiece tube holder. The first limit ring can restrict the detachment between the adjustment ring and the eyepiece tube holder, while giving a hint that the adjustment ring moves to the first set position, thereby preventing it from exceeding the adjustment range.

[0012] More preferably, it further includes a second limit ring, the second limit ring is fixedly externally fitted to the other end of the adjustment ring. When in the second set position, the adjustment ring moves and retracts into the eyepiece tube holder until the second limit ring abuts against the first limit ring. The second limit ring can give a hint that the adjustment ring moves to the second set position, while the adjustment ring can be moved by operating the second limit ring.

[0013] In the above technical solution, preferably, the adjustment ring and the eyepiece tube holder are threadedly connected. For example, an external thread is provided on the outer circumference of one end of the adjustment ring, and an internal thread is provided on the inner circumferential surface of the eyepiece tube holder. By rotating the adjustment ring, the relative position movement adjustment between the two can be realized.

[0014] In the above technical solution, preferably, a slide groove is formed in one of the two eyepiece tube holders, and a slider is provided on the other. The slide groove extends in the axial direction of the adjustment ring, and the slider is located in the slide groove. For example, the slide groove is formed in the adjustment ring, and the slider is formed in the eyepiece tube holder.

[0015] In the above technical solution, preferably, the optical lens is provided on the connection seat component via a switching mechanism. The switching mechanism includes an adjustment block movably connected to the connection seat component. The adjustment block is provided with a mounting hole and a retraction hole. The optical lens is mounted in the mounting hole. When the mounting hole and the optical hole are coaxial, the optical lens cuts into the optical hole. When the retraction hole and the optical hole are coaxial, the optical lens cuts out of the optical hole.

[0016] More preferably, the switching mechanism further includes an elastic sheet. One end of the elastic sheet is fixed, and a bent portion is formed at the other end of the elastic sheet. The adjustment block is provided with a first positioning slot and a second positioning slot. When the optical lens cuts into the optical hole, the bent portion of the elastic sheet engages into the first positioning slot of the adjustment block. When the optical lens cuts out of the optical hole, the bent portion of the elastic sheet engages into the second positioning slot of the adjustment block. By engaging the elastic sheet into the first positioning slot and the second positioning slot, it can be determined whether the optical lens is sufficiently switched.

[0017] Even more preferably, the adjustment block is movably connected to the connection seat component.

[0018] Even more preferably, the switching mechanism is connected to the connection seat component and further includes an operator for controlling the movement of the adjustment block in cooperation with the adjustment block. The operator and the adjustment block are screw-connected.

[0019] More preferably, the switching mechanism further includes a moving guide component, and the moving guide component includes a guide sheet connected to the connection seat component and a guide block connected to the guide sheet and located on at least one side of the adjustment block. A guide channel is formed between the guide sheet and the guide block, and the guide channel extends in the moving direction of the adjustment block. The adjustment block is located in the guide channel, and the moving guide component ensures the stability of the movement of the adjustment block.

[0020] More preferably, the adjustment block is movable in the vertical direction with respect to the connection seat component, and the mounting hole and the retraction hole are provided vertically.

[0021] In the above technical solution, preferably, the optical lens is a single lens with negative optical power or a single lens with positive optical power.

[0022] In the above technical solution, preferably, the binocular lens tube further includes an optical lens set. The optical lens set includes a first right-angle prism, a first lens group, an isosceles right-angle prism, a second right-angle prism, a Porro prism, a second lens group, and a third lens group that are distributed in sequence in the optical path direction. The first lens group, the second lens group, and the third lens group satisfy the following parameters: The focal length f of the first lens group G2 satisfies 100mm < f G2 < 300mm. The first lens group includes a single lens with positive optical power and a double cemented lens group with negative optical power. The double cemented lens group

Number

Number

[0023] More preferably, the first right-angled prism, the first lens group, the isosceles right-angled prism, and the second right-angled prism are provided in the connection seat component, the porro prism is provided in the interpupillary distance adjustment sheet, and the second lens group and the third lens group are provided in the eyepiece lens tube holder.

[0024] In the above technical solution, preferably, the connection seat component includes a lower connection seat and an upper connection seat, which are rotatably connected between the lower connection seat and the upper connection seat. The optical lens is provided on the lower connection seat, and the interpupillary distance adjustment sheet is connected to the upper connection seat.

[0025] In the above technical solution, preferably, the eyepiece lens tube component includes an eyepiece lens tube connected to the adjustment ring, an eyepiece lens adjustment tube connected to the eyepiece lens tube, a diopter adjustment ring, a diopter ring connected to the eyepiece lens adjustment tube through the diopter adjustment ring, and an eyepiece lens stop connected to the eyepiece lens tube.

[0026] Another object of the present invention is to provide an operating microscope having the above adjustable binocular lens tube.

[0027] By applying the above technical solution, the present invention has the following advantages compared with the prior art.

[0028] When using the surgical microscope, by adjusting the binocular lens tube, it provides a comfortable posture for the doctor, enables the doctor to always concentrate on high-precision work, meets the usage needs of different doctors, and works in an ergonomic posture, thereby reducing fatigue during the use of the surgical microscope.

Brief Description of the Drawings

[0029]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

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Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Mode for Carrying Out the Invention

[0030] Hereinafter, with reference to the drawings, the technical solution of the present invention will be clearly and completely described. Of course, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work all belong to the protection scope of the present invention.

[0031] In the description of the present invention, the directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are the directions or positional relationships based on those shown in the accompanying drawings, and are only for facilitating and simplifying the description of the present invention, and do not indicate or imply that the indicated device or element must have a specific direction and be constructed and operated in a specific direction, so it cannot be understood as limiting the present invention. Furthermore, terms such as "first", "second", "third", etc. are for the purpose of description only and cannot be understood as indicating or implying relative importance.

[0032] The adjustable binocular lens tube shown in FIGS. 1 and 2 is applied to a surgical microscope and includes a connection seat component, an interpupillary distance adjustment sheet 2, a binocular lens tube holder 3, a binocular lens tube component, and an optical lens 4.

[0033] The connection base component is used for connecting the mirror body to the surgical microscope, and includes a lower connection base 10 and an upper connection base 11. The lower connection base 10 and the upper connection base 11 are rotatably connected. Specifically, the end face of the lower connection base 10 is a connection end, which is connected to the mirror body of the surgical microscope. And on the end face of the lower connection base 10, a light hole 100 for receiving light rays from the mirror body of the surgical microscope is opened. The optical lens 4 is connected to the lower connection base 10 and aligned with the light hole 100. The interpupillary distance adjustment sheet 2 is fixedly connected to the upper connection base 11.

[0034] The eyepiece tube holder 3 is fixedly connected to the interpupillary distance adjustment sheet 2, and the eyepiece tube component is connected to the eyepiece tube holder 3. The eyepiece tube component includes an eyepiece tube 50, an eyepiece adjustment tube 51 fixedly connected to the eyepiece tube 50, a diopter adjustment ring 53, a diopter ring 52 connected to the eyepiece adjustment tube 51 via the diopter adjustment ring 53, and an eyepiece aperture stop 54 screw-connected to the eyepiece tube 50. Regarding the eyepiece tube component, no improvement is made here and it will not be described in detail.

[0035] In this embodiment, the eyepiece tube component is connected to the eyepiece tube holder 3 via an adjustment mechanism, and the optical lens 4 is provided on the end face of the lower connection base 10 via a switching mechanism. The binocular eyepiece tube, by combining the adjustment mechanism and the switching mechanism, enables the binocular eyepiece tube to have two usage states, namely a first usage state and a second usage state in one embodiment. As shown in FIGS. 16 and 17, two length adjustments of the binocular eyepiece tube are realized. Hereinafter, the adjustment mechanism and the switching mechanism will be specifically described in detail.

[0036] As shown in FIGS. 1 to 7, the adjustment mechanism includes an adjustment ring 60, a first limit ring 61, and a second limit ring 62. Here, the adjustment ring 60 is connected to the eyepiece tube holder 3, and the adjustment ring 60 is movable in the axial direction with respect to the eyepiece tube holder 3. The eyepiece tube 50 of the eyepiece tube component is connected to the adjustment ring 60. Specifically, one end of the adjustment ring 60 is inserted into the inside from one end of the eyepiece tube holder 3, and the adjustment ring 60 can move to extend out of the eyepiece tube holder 3 or retract into the eyepiece tube holder 3. The eyepiece tube 50 is inserted into the other end of the adjustment ring 60 by being inserted or removed. A sleeve 63 is provided between the eyepiece tube 50 and the adjustment ring 60. The sleeve 63 is preferably made of copper so that the eyepiece tube 50 can be detachably connected to the adjustment ring 60. The first limit ring 61 is fixedly connected to one end of the eyepiece tube holder 3, and the second limit ring 62 is fixedly fitted on the outer side of the other end of the adjustment ring. By operating the second limit ring 62, the movement of the ring 60 can be adjusted.

[0037] When the binocular eyepiece tube is in the first use state, the adjustment ring 60 moves in the direction away from the eyepiece tube holder 3 to the first set position, which is the position when the adjustment ring 60 moves and one end of the adjustment ring 60 abuts against the first limit ring 61 until it extends out of the eyepiece tube holder. When the binocular eyepiece tube is in the second use state, the adjustment ring 60 moves in the direction approaching the eyepiece tube holder 3 to the second set position, which is the position when the adjustment ring 60 moves and the second limit ring 62 abuts against the first limit ring 61 until it retracts into the eyepiece tube holder 3.

[0038] As shown in FIGS. 8 to 10, the length of the adjustment ring 60 is, for example, 20 mm. When the binocular lens tube is in the first use state, the binocular lens tube can be extended by 23 mm compared to the conventional structure. When the binocular lens tube is in the second use state, the binocular lens tube can be extended by 43 mm compared to the conventional structure. Of course, the extended length of the binocular lens tube may be adjusted according to the length of the adjustment ring 60.

[0039] The relative movement between the adjustment ring 60 and the eyepiece lens tube holder 3 provides the following two embodiments.

[0040] In one embodiment, as shown in FIGS. 3 and 4, the adjustment ring 60 and the eyepiece lens tube holder 3 are screw-connected. Specifically, an external thread is provided on the outer periphery of one end of the adjustment ring 60, and an internal thread is provided on the inner peripheral surface of the eyepiece lens tube holder 3. By rotating the adjustment ring 60, the relative position movement between the two is realized.

[0041] In another embodiment, as shown in FIGS. 5 to 7, a slide groove 600 is formed in one of the adjustment ring 60 and the eyepiece lens tube holder 3, and a slider 30 is formed in the other. The slide groove 600 extends in the axial direction of the adjustment ring 60, and the slider 30 is located in the slide groove 600. Specifically, the slide groove 600 is formed in the adjustment ring 60, and the slider 30 is provided on the eyepiece lens tube holder 3.

[0042] As shown in FIGS. 11 and 12, the switching mechanism includes an adjustment block 70, an elastic sheet 71, an operator 72, and a movement guide component. Here, The adjustment block 70 is movably connected to the lower connection seat 10. Specifically, the adjustment block 70 is vertically movably connected to the lower connection seat 10. Mounting holes 700 and retraction holes 701 are formed in the adjustment block 70. The mounting holes 700 and retraction holes 701 are provided vertically. A mounting block 702 is provided in the mounting hole 700, and the optical lens 4 covers the mounting hole 700 by the mounting block 702.

[0043] As shown in FIG. 11, when the binocular lens tube is in the first use state, the mounting hole 700 and the optical hole 100 are coaxial. In the mounting hole 700, the optical lens 4 cuts into the optical hole 100. As shown in FIG. 12, when the binocular lens tube is in the second use state, the retraction hole 701 and the optical hole 100 are coaxial. There is no optical lens 4 in the retraction hole 701, and the optical lens 4 cuts out of the optical hole 100. When the binocular lens tube is in the first use state and the second use state, the optical lens 4 is a single lens with negative optical power.

[0044] One end of the elastic sheet 71 is fixed, and a bent portion 710 is formed at the other end of the elastic sheet 71. The adjustment block 70 is provided with a first positioning slot 703 and a second positioning slot 704. When the optical lens 4 cuts into the optical hole 100, the bent portion 710 of the elastic sheet 71 is engaged into the first positioning slot 703 of the adjustment block 70. When the optical lens 4 cuts out of the cut-out optical hole 100, the bent portion 710 of the elastic sheet 71 is engaged into the second positioning slot 704 of the adjustment block 70. By engaging the elastic sheet 71 with the first positioning slot 703 and the second positioning slot 704, it is possible to determine whether the optical lens 4 is sufficiently switched.

[0045] The operator 72 is connected to the lower connection seat 10 and cooperates with the adjustment block 70 to control the vertical movement of the adjustment block 70. For example, the operator 72 and the adjustment block 70 are screw-connected. The operator 72 is rotatable but not movable with respect to the lower connection seat 10, and the adjustment block 70 is movable but not rotatable with respect to the lower connection seat 10. In this way, by rotating the operator 72, the movement of the adjustment block 70 is interlocked.

[0046] The moving guide component includes a guide sheet 73 connected to the lower connection seat 10, guide blocks 74 connected to the guide sheet 73 and located on both sides of the adjustment block 70. A guide channel is formed between the guide sheet 73 and the guide blocks 74. The guide channel extends in the moving direction of the adjustment block 70, and both ends of the adjustment block 70 are located within the guide channel. By moving the guide component, the moving stability of the adjustment block 70 can be ensured.

[0047] And in another embodiment of the binocular lens tube in this embodiment, it has a third usage state and a fourth usage state. When in the third usage state, the optical lens 4 is cut out to the aperture 100, and the adjustment ring 60 moves to the first set position in the direction away from the eyepiece lens tube holder 3. When in the fourth usage state, the optical lens 4 is cut into the aperture 100, and the adjustment ring 60 moves to the second set position in the direction approaching the eyepiece lens tube holder 3. When the binocular lens tube is in the third usage state and the fourth usage state, the optical lens 4 is a single lens with positive optical power. The third usage state and the fourth usage state are similar in principle to the first usage state and the second usage state, and will not be described repeatedly here.

[0048] As shown in FIGS. 13 and 14, the binocular lens tube further includes an optical lens set. The optical lens set includes a first right-angle prism 80, a first lens group 81, an isosceles right-angle prism 82, a second right-angle prism 81, a Porro prism 84, a second lens group 85, and a third lens group 86 that are distributed in sequence in the optical path direction. The first right-angle prism 80, the first lens group 81, the isosceles right-angle prism 82, and the second right-angle prism 83 are provided within the connection seat component. The Porro prism 84 is provided within the interpupillary distance adjustment sheet 2. The second lens group 85 and the third lens group 86 are provided within the eyepiece lens tube holder 3.

[0049] The focal length f of the first lens group 81 G2 is 100mm < f G2is less than 300 mm, and the first lens group 81 includes a single lens G2 having a positive optical power and a double cemented lens group G3 having a negative optical power. The double cemented lens group G3

Number

[0050] The focal length f of the second lens group 85 G3 is such that -1 < f G3 / f G2 < -0.2 is satisfied, and the second lens group 85 includes a double cemented lens group G4 having a negative optical power. The double cemented lens group G4

Number

[0051] The focal length f of the third lens group 86 G4 is such that 1 < f G2 / f G4 < 10 is satisfied, and the third lens group 86 includes a double cemented lens group having a positive optical power, but there are no requirements for the radius of curvature of its cemented surface and the effective aperture of the cemented surface.

[0052] The following are the parameters of the optical lens set when the binocular lens tube is in the first usage state (Table 1) and the second usage state (Table 2).

[0053]

Table 1

[0054]

Table 2

[0055] As shown in Fig. 15, in Table 1 and Table 2, the radius r is the radius of curvature of the lens surface, The thickness d is the thickness at the center of the lens, Nd is the refractive index of the optical glass for d light (wavelength 589.3 nm), Interpretation of the Abbe number Vd: Since the same transparent medium has different refractive indices for lights of different wavelengths and white light consists of colored lights of different wavelengths, a special phenomenon called dispersion occurs when a transparent substance refracts white light. The Abbe number is an index representing the dispersion ability of the transparent medium. The generally used reference standard is the dispersion at the center, that is, it corresponds to the difference in refractive indices between blue light and red light.

[0056] The Abbe number Vd = (nd - 1) / (nF - nC), nd, nF, and nC are the refractive indices of D light, F light, and C light, respectively.

[0057] D light - yellow light, 589.3 nm, D line of the sodium spectrum, F light - blue light, 486.1 nm, F line of the hydrogen spectrum, C light - red light, 656.3 nm, C line of the hydrogen spectrum.

[0058] The above embodiments are only for explaining the technical idea and features of the present invention. For the purpose of enabling those who know this technology to understand the content of the present invention and implement it accordingly, the protection scope of the present invention cannot be limited thereby. Any equivalent changes or modifications made substantially according to the idea of the present invention should be included in the protection scope of the present invention.

Explanation of Signs

[0059] 10, lower connection seat 100, aperture 11, upper connection seat 2, interpupillary distance adjustment sheet 3, eyepiece lens tube holder 30, slider 4, optical lens 50, eyepiece lens tube 51, eyepiece lens adjustment tube 52, diopter ring 53. Visual acuity adjustment ring 54. Eyepiece aperture 60. Adjustment ring 600. Slide groove 61. First limit ring 62. Second limit ring 63. Sleeve 70. Adjustment block 700. Mounting hole 701. Retraction hole 702. Mounting block 703. First positioning slot 704. Second positioning slot 71. Elastic sheet 710. Bending part 72. Operator 73. Guide sheet 74. Guide block 80. First right-angled prism 81. First lens group 82. Isosceles right-angled prism 83. Second right-angled prism 84. Porro prism 85. Second lens group 86. Third lens group a. Reference plane b. Reference surface

Claims

1. A connection seat component, an interpupillary distance adjustment sheet connected to the connection seat component, an eyepiece lens tube holder connected to the interpupillary distance adjustment sheet, and an eyepiece lens tube component connected to the eyepiece lens tube holder, wherein the connection seat component is an adjustable binocular eyepiece lens tube with an aperture formed therein, the eyepiece lens tube component is connected to the eyepiece lens tube holder via an adjustment mechanism, the adjustment mechanism includes an adjustment ring connected to the eyepiece lens tube holder and movable in the axial direction thereof with respect to the eyepiece lens tube holder, the eyepiece lens tube component is connected to the adjustment ring, and the connection seat component is provided with an optical lens capable of cutting into or cutting out of the aperture An adjustable binocular eyepiece lens tube, characterized in that.

2. The binocular eyepiece lens tube has a first use state in which the adjustment ring moves to a first set position in a direction away from the eyepiece lens tube holder and the optical lens cuts into the aperture, and a second use state in which the adjustment ring moves to a second set position in a direction approaching the eyepiece lens tube holder and the optical lens cuts out of the aperture, or, the binocular eyepiece lens tube has a third use state in which the optical lens cuts out of the aperture and the adjustment ring moves to a first set position in a direction away from the eyepiece lens tube holder, and a fourth use state in which the optical lens cuts into the aperture and the adjustment ring moves to a second set position in a direction approaching the eyepiece lens tube holder The adjustable binocular eyepiece lens tube according to Claim 1, characterized in that.

3. One end of the adjustment ring is inserted into the eyepiece lens tube holder from one end thereof, and the adjustment ring can extend from the eyepiece lens tube holder movably or retract into the eyepiece lens tube holder, and the eyepiece lens tube component is connected to the other end of the adjustment ring The adjustable binocular eyepiece lens tube according to Claim 2, characterized in that.

4. The eyepiece tube component is inserted into the other end of the adjustment ring, and a sleeve is provided between the eyepiece tube component and the adjustment ring. The adjustable binocular eyepiece tube according to claim 3, characterized in that.

5. The adjustment mechanism further includes a first limit ring, the first limit ring is connected to one end of the eyepiece tube holder, and when in the first set position, the adjustment ring moves until one end of the adjustment ring abuts against the first limit ring and extends out of the eyepiece tube holder. The adjustable binocular eyepiece tube according to claim 3, characterized in that.

6. The adjustment mechanism further includes a second limit ring, the second limit ring is fixedly externally fitted to the other end of the adjustment ring, and when in the second set position, the adjustment ring moves and retracts into the eyepiece tube holder until the second limit ring abuts against the first limit ring. The adjustable binocular eyepiece tube according to claim 5, characterized in that.

7. The adjustment ring and the eyepiece tube holder are screw-connected. The adjustable binocular eyepiece tube according to any one of claims 1 to 6, characterized in that.

8. One of the adjustment ring and the eyepiece tube holder is provided with a slide groove, and the other is provided with a slider. The slide groove extends in the axial direction of the adjustment ring, and the slider is located in the slide groove. The adjustable binocular eyepiece tube according to any one of claims 1 to 6, characterized in that.

9. The optical lens is provided on the connection seat component through a switching mechanism. The switching mechanism includes an adjustment block movably connected to the connection seat component. The adjustment block is provided with a mounting hole and a retraction hole. The optical lens is mounted in the mounting hole. When the mounting hole and the optical hole are coaxial, the optical lens cuts into the optical hole. When the retraction hole and the optical hole are coaxial, the optical lens cuts out of the optical hole. The adjustable binocular eyepiece tube according to claim 1, characterized in that.

10. The switching mechanism further includes an elastic sheet. One end of the elastic sheet is fixed, and a bent portion is formed at the other end of the elastic sheet. The adjustment block is provided with a first positioning slot and a second positioning slot. When the optical lens cuts into the light hole, the bent portion of the elastic sheet is engaged in the first positioning slot of the adjustment block. When the optical lens cuts out of the light hole, the bent portion of the elastic sheet is engaged in the second positioning slot of the adjustment block. The adjustable binocular lens tube according to claim 9, characterized in that.

11. The adjustment block is movably connected to the connection seat component. The adjustable binocular lens tube according to claim 9, characterized in that.

12. The switching mechanism is connected to the connection seat component and further includes an operator that cooperates with the adjustment block to control the movement of the adjustment block. The operator and the adjustment block are screw-connected. The adjustable binocular lens tube according to claim 11, characterized in that.

13. The switching mechanism further includes a movement guide component. The movement guide component includes a guide sheet connected to the connection seat component and a guide block connected to the guide sheet and located on at least one side of the adjustment block. A guide channel is formed between the guide sheet and the guide block. The guide channel extends in the movement direction of the adjustment block, and the adjustment block is located in the guide channel. The adjustable binocular lens tube according to claim 11, characterized in that.

14. The adjustment block is movable in the vertical direction with respect to the connection seat component, and the mounting hole and the retraction hole are provided vertically. The adjustable binocular lens tube according to claim 11, characterized in that.

15. The optical lens is a single lens with negative optical power or a single lens with positive optical power. The adjustable binocular lens tube according to claim 1, characterized in that.

16. The binocular lens tube further includes an optical lens set, and the optical lens set includes a first right-angled prism, a first lens group, an isosceles right-angled prism, a second right-angled prism, a Porro prism, a second lens group, and a third lens group that are sequentially distributed in the optical path direction. The adjustable binocular lens tube according to claim 1, characterized in that.

17. The focal length f of the first lens group Ｇ２ satisfies 100 mm < f Ｇ２ < 300 mm, The focal length f of the second lens group Ｇ３ satisfies -1 < f Ｇ３ / f Ｇ２ < -0.2, The focal length f of the third lens group Ｇ４ satisfies 1 < f Ｇ２ / f Ｇ４ < 10 The adjustable binocular lens tube according to claim 16, characterized in that.

18. The first lens group includes a single lens having a positive optical power and a double-junction lens group having a negative optical power, and the double-junction lens group is 【Number 1】 satisfies, and R ２ is the radius of curvature of the joint surface, and φ ２ is the effective diameter of the joint surface, and The second lens group includes a double-junction lens group having a negative optical power, and the double-junction lens group is 【Number 2】 satisfies, and R ３ is the radius of curvature of the joint surface, and φ ３ is the effective aperture of the joint surface, The third lens group includes a double-junction lens group having a positive optical power. The adjustable binocular lens tube according to claim 17, characterized in that.

19. The first right-angled prism, the first lens group, the isosceles right-angled prism, and the second right-angled prism are provided in the connection seat component, the Porro prism is provided in the interpupillary distance adjustment sheet, and the second lens group and the third lens group are provided in the eyepiece lens tube holder. The adjustable binocular lens tube according to claim 16, characterized in that.

20. The connection seat component includes a lower connection seat and an upper connection seat, and the lower connection seat and the upper connection seat are rotatably connected. The optical lens is provided on the lower connection seat, and the interpupillary distance adjustment sheet is connected to the upper connection seat. The adjustable binocular lens tube according to claim 1, characterized in that.

21. The eyepiece lens tube component includes an eyepiece lens tube connected to the adjustment ring, an eyepiece lens adjustment tube connected to the eyepiece lens tube, a diopter adjustment ring, a diopter ring connected to the eyepiece lens adjustment tube via the diopter adjustment ring, and an eyepiece lens aperture connected to the eyepiece lens tube. The adjustable binocular lens tube according to claim 1, characterized in that.

22. A surgical microscope, Comprising the adjustable binocular lens tube according to any one of claims 1 to 21. The surgical microscope, characterized in that.

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