Adjustable binocular lens tubes 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] This invention belongs to the field of medical device technology and specifically relates to an adjustable binocular lens tube and a surgical microscope. [Background technology]

[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, pulpology, periodontology, and microsurgery. For ergonomic reasons, the position and size of the surgical microscope need to be adjusted based on the operator's correct working position to obtain optimal muscle and visual working conditions.

[0003] The main mirror of a surgical microscope generally includes the mirror body, binocular lens tubes, eyepieces, a large zoom objective lens, a handle, etc. In most surgeries, the lens of the surgical microscope should be positioned horizontally, and the surgeon observes through the binocular lens tubes. The basic principle of binocular lens tubes is to use a set of prism systems to split the image formed by the objective lens into two parts, left and right, which are observed through the two eyepieces. The difference in magnification between the two lens tubes should not exceed 2-2.5%, the images formed by the two lens tubes should coincide in direction, 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 size of the images from the two lens tubes should be the same.

[0004] Muscle pain and tension from prolonged use of surgical microscopes are a common occurrence for physicians in all specialties during their work, with 78% of neurosurgeons reporting pain after a day of surgery, and 83% of those experiencing musculoskeletal pain. Long hours of surgery and high levels of mental concentration place a heavy burden on the physician's body; for example, every inch (2.54 centimeters) the head is moved forward requires the muscles of the head, neck, and upper back to compensate for an additional 10 pounds (4536 grams) of body weight. Such compromising postures are prone to causing pain, which can spread to the arms and other localized areas, thus leading to headaches, chronic pain, and fatigue.

[0005] The eyepiece length in the binocular tubes of conventional surgical microscopes is short and non-adjustable, making it difficult to adapt to different surgical positions of surgeons. This increases tension in the muscles of the lower back, neck, and shoulders, which does not conform to ergonomic design principles and negatively impacts surgical efficiency. [Overview of the project]

[0006] The present invention aims to provide an adjustable binocular lens tube.

[0007] To achieve the above objectives, the technical solutions employed in this invention include: An adjustable bi-eyepiece tube comprising a connecting seat component, an interpupillary distance adjustment sheet connected to the connecting seat component, an eyepiece tube holder connected to the interpupillary distance adjustment sheet, and an eyepiece tube component connected to the eyepiece tube holder, wherein the connecting seat component has an optical hole, The eyepiece tube component is connected to the eyepiece tube holder via an adjustment mechanism, the adjustment mechanism is connected to the eyepiece tube holder and includes an adjustment ring that is movable in the axial direction relative to the eyepiece tube holder, the eyepiece tube component is connected to the adjustment ring, and the connecting seat component is provided with an optical lens that can be cut into or out of the optical hole.

[0008] In the above technical solution, preferably, the bi-eyepiece tube has a first operating state in which the adjustment ring moves away from the eyepiece tube holder to a first setting position and the optical lens cuts into the optical hole, and a second operating state in which the adjustment ring moves towards the eyepiece tube holder to a second setting position and the optical lens cuts into the optical hole; in other words, the bi-eyepiece tube achieves two-stage adjustment. The bifocal tube has a third operating state in which the optical lens cuts out into the optical hole and the adjustment ring moves to a first setting position in a direction away from the eyepiece tube holder, and a fourth operating state in which the optical lens cuts into the optical hole and the adjustment ring moves to a second setting position in a direction approaching the eyepiece tube holder.

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

[0010] 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 preferably being made of copper for connecting the eyepiece tube component, for example, for plug-in and plug-out connections.

[0011] More preferably, the adjustment ring further comprises a first limit ring connected to one end of the eyepiece tube holder, and when in the first set position, the adjustment ring moves to extend out of the eyepiece tube holder until one end of the adjustment ring abuts against the first limit ring, and the first limit ring can restrict the adjustment ring from separating from the eyepiece tube holder, while also providing an indication that the adjustment ring will move to the first set position to prevent it from exceeding the adjustment range.

[0012] More preferably, the adjustment ring further comprises a second limit ring fixedly fitted onto the other end of the adjustment ring, and when in the second set position, the adjustment ring moves to retract into the eyepiece tube holder until the second limit ring abuts against the first limit ring, and the second limit ring can give indication that the adjustment ring is moving 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 connected by screws, for example, a male thread is provided on the outer circumference of one end of the adjustment ring, and a female thread is provided on the inner surface of the eyepiece tube holder, and the relative position of the two is adjusted by rotating the adjustment ring.

[0014] In the above technical solution, preferably, a sliding groove is provided in one of the eyepiece tube holders and a slider is provided in the other, the sliding groove extends in the axial direction of the adjustment ring, and the slider is located within the sliding groove, for example, the adjustment ring has the sliding groove and the eyepiece tube holder has the slider.

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

[0016] More preferably, the switching mechanism further comprises an elastic sheet, one end of which is fixed, and a bent portion formed at the other end of which. The adjustment block has 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 with the first positioning slot of the adjustment block. When the optical lens cuts out into the optical hole, the bent portion of the elastic sheet engages with the second positioning slot of the adjustment block. The engagement of the elastic sheet with the first and second positioning slots allows for determination of whether the optical lens is sufficiently switched.

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

[0018] More preferably, the switching mechanism further comprises an operator connected to the connection seat component and cooperating with the adjustment block to control the movement of the adjustment block, wherein 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. The guide channel extends in the moving direction of the adjustment block. The adjustment block is located within 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 100 mm < f G2 < 300 mm. The first lens group includes a single lens with positive optical power and a double-junction lens group with negative optical power. The double-junction lens group

Number

Number

[0023] More preferably, the first right-angle prism, the first lens group, the isosceles right-angle prism, and the second right-angle 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, 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.

[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 aperture 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] This invention provides a comfortable posture for physicians when using a surgical microscope by adjusting the binocular lens tubes, allowing physicians to always concentrate on high-precision work, meeting the diverse user needs of different physicians, and reducing fatigue during surgical microscope use by enabling work in an ergonomically designed posture. [Brief explanation of the drawing]

[0029] [Figure 1] This is a schematic perspective view of the binocular lens tube in this embodiment. [Figure 2] This is a schematic side view of the binocular lens tube in this embodiment. [Figure 3] This is a schematic cross-sectional view of one embodiment of the adjustment mechanism in this embodiment (at the first setting position). [Figure 4] This is a schematic cross-sectional view of one embodiment of the adjustment mechanism in this embodiment (at the second setting position). [Figure 5] This is a schematic bottom view of one embodiment of the adjustment mechanism in this example. [Figure 6] This is a schematic cross-sectional view of another embodiment of the adjustment mechanism in this embodiment (at the first setting position). [Figure 7] This is a schematic cross-sectional view of another embodiment of the adjustment mechanism in this embodiment (at the second setting position). [Figure 8] This is a schematic diagram showing the extension distance of the binocular lens tubes in the first operating state in this embodiment. [Figure 9] This is a schematic diagram showing the extended distance of the binocular lens tube in the second usage state in this embodiment. [Figure 10] This is a schematic diagram of a bifocal lens tube using conventional technology. [Figure 11] This is a schematic diagram of the cutting process for the optical lens in this embodiment. [Figure 12] This is a schematic diagram of the cutting process for the optical lens in this embodiment. [Figure 13] This is a schematic diagram of an optical lens set in the first operating state in this embodiment. [Figure 14] This is a schematic diagram of an optical lens set in the second operating state in this embodiment. [Figure 15] This is a schematic diagram of the radius and thickness parameters of the optical lens set in this embodiment. [Figure 16] This is a schematic diagram of the usage state in this embodiment, where the binocular lens tubes are in the first usage state. [Figure 17] This is a schematic diagram of the usage state in this embodiment, where the binocular lens tube is in the second usage state. [Modes for carrying out the invention]

[0030] The technical solutions of the present invention will be described clearly and completely below with reference to the drawings, and of course, the embodiments described are not all embodiments but some embodiments of the present invention. Any other embodiments that a person skilled in the art can obtain without creative work based on the embodiments of the present invention are all within the scope of protection of the present invention.

[0031] In the description of this invention, the orientations or positional relationships indicated by terms such as "center," "up," "down," "left," "right," "vertical," "horizontal," "inside," and "outside" are based on the orientations or positional relationships shown in the accompanying drawings and are merely for the purpose of facilitating and simplifying the description of this invention. They do not indicate or suggest that the pointed-out device or element has a specific orientation or must be constructed and operated in a specific orientation, and therefore should not be understood as limiting the invention. Furthermore, terms such as "first," "second," and "third" are for descriptive purposes only and should not be understood as indicating or implying relative importance.

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

[0033] The connecting seat component is used to connect the mirror body to the surgical microscope and comprises a lower connecting seat 10 and an upper connecting seat 11, with the lower connecting seat 10 and the upper connecting seat 11 being rotatably connected. Specifically, the end face of the lower connecting seat 10 is connected to the mirror body of the surgical microscope at the connection end, and an optical hole 100 is made in the end face of the lower connecting seat 10 to receive light rays from the mirror body of the surgical microscope. The optical lens 4 is connected to the lower connecting seat 10 and aligned with the optical hole 100, and the interpupillary distance adjustment sheet 2 is fixedly connected to the upper connecting seat 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 comprises 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 54 screw-connected to the eyepiece tube 50. The eyepiece tube component has not been improved and will not be described in detail here.

[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 seat 10 via a switching mechanism. The bi-eyepiece tube, through the combination of the adjustment mechanism and the switching mechanism, has two usage states in one embodiment: a first usage state and a second usage state, and two length adjustments of the bi-eyepiece tube are realized as shown in Figures 16 and 17. The adjustment mechanism and the switching mechanism will be described in detail below.

[0036] As shown in Figures 1-7, the adjustment mechanism comprises 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 relative to the eyepiece tube holder 3 in its axial direction, and 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 eyepiece tube holder 3 from one end, and the adjustment ring 60 can move to extend out of the eyepiece tube holder 3 or retract into the eyepiece tube holder 3, and the eyepiece tube 50 is inserted into the other end of the adjustment ring 60 by inserting and removing it. A sleeve 63 is provided between the eyepiece tube 50 and the adjustment ring 60, and the sleeve 63 is preferably made of copper so that the eyepiece tube 50 is removably 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 onto the other end of the adjustment ring, allowing the movement of the ring 60 to be adjusted by operating the second limit ring 62.

[0037] When the binocular tube is in the first use state, the adjustment ring 60 moves away from the eyepiece tube holder 3 to a first set position, which is the position where the adjustment ring 60 extends out of the eyepiece tube holder until one end of the adjustment ring 60 contacts the first limit ring 61. When the binocular tube is in the second use state, the adjustment ring 60 moves towards the eyepiece tube holder 3 to a second set position, which is the position where the adjustment ring 60 retracts into the eyepiece tube holder 3 until the second limit ring 62 contacts the first limit ring 61.

[0038] As shown in Figures 8-10, the length of the adjustment ring 60 is, for example, 20 mm. When the binocular tube is in the first use state, the binocular tube can be extended by 23 mm compared to the conventional structure, and when the binocular tube is in the second use state, the binocular tube can be extended by 43 mm compared to the conventional structure. Of course, the extended length of the binocular 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 tube holder 3 provides the following two embodiments.

[0040] In one embodiment, as shown in Figures 3 and 4, the adjustment ring 60 and the eyepiece tube holder 3 are connected by screws. Specifically, a male thread is provided on the outer circumference of one end of the adjustment ring 60, and a female thread is provided on the inner surface of the eyepiece tube holder 3. By rotating the adjustment ring 60, the relative positions of the two are adjusted.

[0041] In another embodiment, as shown in Figures 5-7, a slide groove 600 is provided in one of the adjustment ring 60 and the eyepiece tube holder 3, and a slider 30 is provided in the other. The slide groove 600 extends axially along the adjustment ring 60, and the slider 30 is located within the slide groove 600. Specifically, the adjustment ring 60 has a slide groove 600, and the eyepiece tube holder 3 is provided with a slider 30.

[0042] As shown in Figures 11 and 12, the switching mechanism comprises an adjustment block 70, an elastic sheet 71, an operator 72, and a movement guide component. The adjustment block 70 is movably connected to the lower connection seat 10, specifically, the adjustment block 70 is movably connected to the lower connection seat 10 vertically, and the adjustment block 70 has a mounting hole 700 and a retraction hole 701, the mounting hole 700 and retraction hole 701 are provided vertically, and a mounting block 702 is provided in the mounting hole 700, and the optical lens 4 covers the mounting hole 700 with the mounting block 702.

[0043] As shown in Figure 11, when the bi-eyepiece tube is in the first operating state, the mounting hole 700 and the optical hole 100 are coaxial, and the optical lens 4 cuts into the optical hole 100 at the mounting hole 700. As shown in Figure 12, when the bi-eyepiece tube is in the second operating state, the retraction hole 701 and the optical hole 100 are coaxial, the retraction hole 701 does not have an optical lens 4, and the optical lens 4 cuts into the optical hole 100. When the bi-eyepiece tube is in the first and second operating states, 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 has 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 engages with the first positioning slot 703 of the adjustment block 70. When the optical lens 4 cuts out into the cut-out optical hole 100, the bent portion 710 of the elastic sheet 71 engages with the second positioning slot 704 of the adjustment block 70. By the engagement of 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 has been sufficiently switched.

[0045] The operator 72 is connected to the lower connection seat 10 and works together 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 connected by screws, the operator 72 is rotatable but not movable relative to the lower connection seat 10, and the adjustment block 70 is movable but not rotatable relative to the lower connection seat 10. In this way, the movement of the adjustment block 70 is linked by rotating the operator 72.

[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 G2The first lens group 81 satisfies the requirement of <300mm, and comprises a single lens G2 having positive optical power and a double-bonded lens group G3 having negative optical power, and the double-bonded lens group G3 is

number

[0050] Focal length f of lens group 85 G3 is -1 <f G3 / f G2 Satisfying <-0.2, the second lens group 85 comprises a double-bonded lens group G4 having negative optical power, and the double-bonded lens group G4 is

number

[0051] Focal length f of lens group 86 G4 is, 1 <f G2 / f G4 The condition <10 is satisfied, and the third lens group 86 comprises a double-bonded lens group with positive optical power, but there are no requirements regarding the radius of curvature of the bonding surface or the effective aperture of the bonding surface.

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

[0053] [Table 1]

[0054] [Table 2]

[0055] As shown in Figure 15, in Tables 1 and 2, The radius r is the radius of curvature of the lens surface, Thickness d is the thickness of the center of the lens. Nd is the refractive index of optical glass for d light (wavelength 589.3 nm). Interpretation of Vd: The same transparent medium has different refractive indices for light of different wavelengths, and white light consists of colored light of different wavelengths. When a transparent material refracts white light, a special phenomenon called chromatic scattering occurs. The Ave number is an index used to represent the chromatic scattering ability of a transparent medium, and the commonly used reference standard is chromatic scattering at the center, that is, it corresponds to the difference in refractive indices between blue light and red light.

[0056] 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, the C line of the hydrogen spectrum.

[0058] The above embodiments are merely for illustrating the technical idea and features of the present invention, and their purpose is to enable a person familiar with this art to understand and implement the present invention, but not to limit the scope of protection of the present invention. Any substantially equivalent modifications or alterations made in accordance with the idea of ​​the present invention should be included within the scope of protection of the present invention. [Explanation of symbols]

[0059] 10. Lower connection seat 100, light hole 11. Upper connecting seat 2. Interpupillary distance adjustment sheet 3. Eyepiece tube holder 30, Slider 4. Optical lenses 50. Eyepiece tube 51. Eyepiece adjustment tube 52. Diopter ring 53. Diopter adjustment ring 54. Eyepiece diaphragm 60. Adjustment ring 600, slide groove 61. First Limit Ring 62. Second Limit Ring 63. Sleeves 70. Adjustment block 700, mounting holes 701, Evacuation hole 702, Mounting Block 703, First positioning slot 704, Second positioning slot 71. Elastic sheet 710, Folding part 72. Operator 73. Guide Sheet 74. Guide block 80, First Right-Angle Prism 81. First lens group 82. Isosceles right-angle prism 83. Second right-angle prism 84. Porro prism 85, Second lens group 86. Third lens group a, reference plane b, control surface

Claims

1. An adjustable bi-eyepiece tube comprising a connecting seat component, an interpupillary distance adjustment sheet connected to the connecting seat component, an eyepiece tube holder connected to the interpupillary distance adjustment sheet, and an eyepiece tube component connected to the eyepiece tube holder, wherein the connecting seat component has an optical hole, The eyepiece tube component is connected to the eyepiece tube holder via an adjustment mechanism, the adjustment mechanism is connected to the eyepiece tube holder and includes an adjustment ring that is movable in the axial direction relative to the eyepiece tube holder, the eyepiece tube component is connected to the adjustment ring, and the connecting seat component is provided with an optical lens that can be cut into or out of the optical hole. The aforementioned bifocal tube has a first operating state in which the adjustment ring moves away from the eyepiece tube holder to a first setting position and the optical lens cuts into the optical hole, and a second operating state in which the adjustment ring moves towards the eyepiece tube holder to a second setting position and the optical lens cuts out into the optical hole. Alternatively, the bi-eyepiece tube has a third operating state in which the optical lens cuts out into the optical hole and the adjustment ring moves to a first setting position in a direction away from the eyepiece tube holder, and a fourth operating state in which the optical lens cuts into the optical hole and the adjustment ring moves to a second setting position in a direction approaching the eyepiece tube holder. An adjustable binocular eyepiece tube characterized by the following features.

2. One end of the adjustment ring is inserted into the eyepiece tube holder from one end thereof, and the adjustment ring is movable, extending out of the eyepiece tube holder or retracting into the eyepiece tube holder, and the eyepiece tube component is connected to the other end of the adjustment ring. The adjustable binocular lens tube according to feature 1.

3. 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 lens tube according to feature 2.

4. The adjustment mechanism further comprises a first limit ring, the first limit ring being connected to one end of the eyepiece tube holder, and when in the first setting position, the adjustment ring moves and extends from the eyepiece tube holder until one end of the adjustment ring contacts the first limit ring. The adjustable binocular lens tube according to feature 2.

5. The adjustment mechanism further comprises a second limit ring, the second limit ring being fixedly fitted onto the other end of the adjustment ring, and when in the second setting position, the adjustment ring moves and retracts into the eyepiece tube holder until the second limit ring contacts the first limit ring. The adjustable binocular lens tube according to feature 4.

6. The adjustment ring and the eyepiece tube holder are connected by screws, and / or A sliding groove is provided in one of the adjustment ring and the eyepiece tube holder, and a slider is provided in the other, the sliding groove extends in the axial direction of the adjustment ring, the slider is located within the sliding groove, and / or The optical lens is either a single lens with negative optical power or a single lens with positive optical power. The adjustable binocular lens tube according to any one of claims 1 to 5.

7. 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 has a mounting hole and a retraction hole, the optical lens is mounted in the mounting hole, the optical lens cuts into the optical hole when the mounting hole and the optical hole are coaxial, and the optical lens cuts into the optical hole when the retraction hole and the optical hole are coaxial. The adjustable binocular lens tube according to feature 1.

8. The switching mechanism further comprises an elastic sheet, one end of which is fixed, and the other end of which has a bent portion. The adjustment block has 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 with the first positioning slot of the adjustment block. When the optical lens cuts out into the optical hole, the bent portion of the elastic sheet engages with the second positioning slot of the adjustment block. The adjustable binocular tube according to feature 7.

9. The adjustment block is movably connected to the connection seat component. The adjustable binocular tube according to feature 7.

10. The switching mechanism further comprises an operator connected to the connection seat component and cooperating with the adjustment block to control the movement of the adjustment block, the operator and the adjustment block being screw-connected and / or The switching mechanism further comprises a moving guide component, the moving guide component comprising a guide seat connected to the connecting seat component, and a guide block connected to the guide seat and located on at least one side of the adjustment block, wherein a guide channel is formed between the guide seat and the guide block, the guide channel extends in the direction of movement of the adjustment block, the adjustment block is located within the guide channel, and / or The adjustment block is movable vertically relative to the connecting seat component, and the mounting hole and retraction hole are provided vertically. The adjustable binocular lens tube according to feature 9.

11. The aforementioned bifocal lens tube further comprises an optical lens set, the optical lens set comprising 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, which are distributed sequentially in the direction of the optical path. The focal length f of the first lens group Ｇ２ is 100mm < f Ｇ２ <Meets the requirement of 300 mm, The focal length f of the second lens group Ｇ３ -1 < f Ｇ３ / f Ｇ２ Satisfying <-0.2, The focal length f of the third lens group Ｇ４ is 1 < f Ｇ２ / f Ｇ４ < Satisfying 10 The adjustable binocular lens tube according to feature 1.

12. The first lens group comprises a single lens having positive optical power and a double-bonded lens group having negative optical power, and the double-bonded lens group is [Math 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, The second lens group comprises a double-bonded lens group having negative optical power, and this double-bonded lens group is [Math 2] Satisfying R ３ φ is the radius of curvature of the joint surface. ３ This is the effective diameter of the joint surface, The third lens group comprises a double-bonded lens group having positive optical power, or The first right-angle prism, the first lens group, the isosceles right-angle prism, and the second right-angle prism are provided within the connecting seat component, the Porro prism is provided within the interpupillary distance adjustment sheet, and the second lens group and the third lens group are provided within the eyepiece tube holder. The adjustable binocular lens tube according to feature 11.

13. The connecting seat component comprises a lower connecting seat and an upper connecting seat, the lower connecting seat and the upper connecting seat being rotatably connected, the optical lens being provided on the lower connecting seat, the interpupillary distance adjustment sheet being connected to the upper connecting seat, and / or The eyepiece tube component comprises an eyepiece tube connected to the adjustment ring, an eyepiece adjustment tube connected to the eyepiece tube, a diopter adjustment ring, a diopter ring connected to the eyepiece adjustment tube via the diopter adjustment ring, and an eyepiece aperture connected to the eyepiece tube. The adjustable binocular lens tube according to feature 1.

14. A surgical microscope, The adjustable binoculars tube is provided according to any one of claims 1 to 13. A surgical microscope characterized by the following features.

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