Extended structure, optical system and surgical microscope

Abstract

The present invention relates to an expansion structure and an optical system, comprising a first connection sheet and a second connection sheet, a first connection end formed at one end of the first connection sheet, a second connection end formed at one end of the second connection sheet, and the first connection sheet and the second connection sheet are connected to be relatively rotatable between them, and the rotation axis lines of the first connection sheet and the second connection sheet are parallel, and the optical system is installed in the expansion structure. The surgical microscope includes a mirror body, an expansion structure connected to the mirror body, a rotation structure connected to the expansion structure, and an eyepiece connected to the rotation structure, and the eyepiece can be rotated up and down relative to the mirror body by the expansion structure and the rotation structure. The adjustment range of the present invention is more extensive, ensuring that the clinician obtains an ergonomic clinical sitting posture, effectively reducing and preventing muscle tension in the waist, neck and shoulders, allowing the clinician to stay away from the problems of cervical spondylosis and lumbar spondylosis, providing more diverse adjustments, adapting to the needs of the dentist's own sitting posture, simple in structure, and convenient in installation.

Description

[Technical field]

[0001] The present invention relates to the field of medical instruments, and to a surgical microscope, in particular to an extension structure and its optical system, and a surgical microscope with the extension structure. [Background technology]

[0002] At present, the surgical microscope is widely used in the field of oral cavity, and its perfect field of vision, excellent lighting, and comfortable operating posture have led more and more dentists to approve its huge prospects in oral therapy. The main mirror part of the surgical microscope generally includes a binocular tube, eyepieces, a super zoom objective lens (VarioDist), a handle, a microscope body, etc., and the microscope body is equipped with a full HD image system, an LED integrated lighting module, and an optical zoom. The lens of the surgical microscope can be precisely moved and inverted in horizontal and vertical angles according to the needs of examination and treatment. In most cases, the lens of the surgical microscope needs to be placed in a horizontal position, and at this time, the doctor observes through the binocular tube. The mechanical system is the skeleton of the surgical microscope, which determines the range of microscope movement. The current 0°-190° variable angle binocular tube follows the principles of ergonomics, and the clinician can adjust the binocular tube according to his own comfortable sitting posture, which can effectively reduce the fatigue of the dentist. The design of the surgical microscope needs to be combined with the experience and feedback of the clinician to better promote it. Some dentists have feedback that the binocular tube has a limited range of adjustment, and the binocular tube's lowering or rising height in the horizontal position cannot meet the dentist's regulations, and some dentists have feedback that the distance between the telescope body and the binocular tube is slightly short, making it difficult to adjust the downward height in the horizontal position. Clinicians need long-term work, and these factors will more or less cause muscle tension in the waist, neck and shoulders, which is detrimental to the physical and mental health of dentists.

[0003] See patents with publication numbers CN108020914A, CN2nl23465U, and CN106610523A, all of which disclose a surgical microscope, in which a rotation structure is provided between the body and the eyepiece, so that the eyepiece can rotate up and down relative to the body. However, all of them have the problem that the lowering or raising height of the eyepiece cannot be adjusted, or the distance between the body and the eyepiece is slightly short, making it difficult to adjust the downward height in the horizontal position. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] CN108020914A [Patent Document 2] CN2nl23465U [Patent Document 3] CN106610523A Summary of the Invention [Problem to be solved by the invention]

[0005] One objective of the present invention is to provide a simple and convenient extension structure which is applicable to a surgical microscope and can be attached between the microscope body and the eyepiece as a part according to the needs of use. [Means for solving the problem]

[0006] In order to achieve the above objectives, the technical solution used in the present invention is: An extension structure, the extension structure having an optical path channel formed therein, including a first connection sheet and a second connection sheet, the first connection sheet having a first connection end at one end thereof, the second connection sheet having a second connection end at one end thereof, and a first connection sheet and a second connection sheet having a second connection end at one end thereof. teeth The first and second connection sheets are connected to be capable of relative rotation, and the rotation axes of the first and second connection sheets are parallel to each other.

[0007] Preferably, the extension structure also includes a mounting seat. One end of the mounting seat forms a first mounting end, and the other end forms a second mounting end. The second mounting end of the mounting seat is connected to the first connection end of the first connection sheet. Through the mounting seat, the upward or downward vibration amplitude of the eyepiece lens relative to the lens body can be improved. An included angle a is formed between the plane where the first mounting end of the mounting seat is located and the plane where the second mounting end of the mounting seat is located, and the range of the included angle a is 0° < a ≤ 90°. Preferably, the range of the included angle a is 30° ≤ a ≤ 90°. When the included angle is 90°, the up-and-down vibration amplitude of the eyepiece lens relative to the lens body is the largest.

[0008] More preferably, the extension structure also includes a third connection sheet. The first connection sheet and the second connection sheet are connected through the third connection sheet. The third connection sheet is installed on at least one side of the first connection sheet and the second connection sheet. The third connection sheet can connect the first connection sheet and the second connection sheet and can also play a role in covering the rotational transmission assembly.

[0009] Even more preferably, the extension structure also includes a rotational transmission assembly. The rotational transmission assembly includes a first transmission gear and a second transmission gear. The first transmission gear is connected to the first connection sheet, and the second transmission gear is connected to the second connection sheet. The first transmission gear and the second transmission gear mesh with each other.

[0010] One object of the present invention is to provide an optical system of an extension structure such that the operating microscope is not affected by the increase in the optical system in terms of the clarity and completeness of the visual field.

[0011] To achieve the above object, the technical solution adopted by the present invention is An optical system with an extended structure, having an optical path channel formed therein, including a mounting seat, a first connection sheet, a second connection sheet, and a third connection sheet. At one end of the mounting seat, a first attachment end is formed, and at the other end, a second attachment end is formed. At one end of the first connection sheet, a first connection end is formed. At one end of the second connection sheet, a second connection end is formed. The second attachment end of the mounting seat is connected to the first connection end of the first connection sheet. The first connection sheet and the second connection sheet are connected via the third connection sheet. Between the first connection sheet and the second connection sheet teeth They are connected so as to be relatively rotatable. The optical path channel is sequentially formed inside the mounting seat, the first connection sheet, the third connection sheet, and the second connection sheet. The optical system is installed in the optical path channel. The optical system includes a first lens group, a second lens group, and a third lens group. The first lens group satisfies 30mm < fGl < 150mm. The second lens group satisfies 2 < fG2 / fGl < 10. The third lens group satisfies 0.5 < fG3 / fGl < 5. Here, fGl is the focal length of the first lens group, fG2 is the focal length of the second lens group, and fG3 is the focal length of the third lens group.

[0012] Preferably, the first lens group satisfies 50mm < fGl < 150mm, and the third lens group satisfies 0.5 < fG3 / fGl < 2.

[0013] Preferably, the first lens group is a doublet lens group having a positive refractive power. The doublet lens group satisfies

Number

Number

[0014] More preferably, the first lens group includes a first lens and a second lens arranged sequentially along the optical path direction, the second lens group includes a third lens, a fourth lens and a fifth lens arranged sequentially along the optical path direction, and the third lens group includes a sixth lens and a seventh lens arranged sequentially along the optical path direction, and a specific manner of installing the lenses is provided.

[0015] Preferably, the optical system also includes a folding mirror group, which is used to change the projection direction of the light beam, and the folding mirror group includes a first folding lens, a second folding lens, a third folding lens, and a fourth folding lens, and the light path passes through the first lens group, the first folding lens, the second folding lens, the third folding lens, the second lens group, the fourth folding lens, and the third lens group in order. of When passing through, it does not follow a straight line, so it can be folded by installing the folding lens.

[0016] More preferably, the first folding lens is a pentaprism, and the second folding lens, the third folding lens and the fourth folding lens are corner cubes.

[0017] More preferably, the first lens group and the first folded lens are installed in the mounting seat, the second folded lens is installed in the first connecting sheet, the third folded lens is installed in the third connecting sheet, the second lens group is installed in the third connecting sheet or the second connecting sheet, and the fourth folded lens and the third lens group are installed in the second connecting sheet.

[0018] One objective of the present invention is to provide a surgical microscope with a wider extended area and an extended structure attached thereto, in order to meet more needs of users than the conventional adjustment area.

[0019] In order to achieve the above objectives, the technical solution used in the present invention is: A surgical microscope, comprising: a body; and an eyepiece connected to the body, the eyepiece being connected to the body by a rotation structure so that the eyepiece can rotate in an up-down direction relative to the body; the surgical microscope also comprising an extension structure, the extension structure including a first connection sheet and a second connection sheet, a first connection end being formed at one end of the first connection sheet, a second connection end being formed at one end of the second connection sheet, the first connection end of the first connection sheet being connected to the body, and the second connection end of the second connection sheet being connected to the rotation structure; teeth The first connection sheet and the second connection sheet are connected so as to be rotatable relative to each other, and the rotation axis lines of the first connection sheet and the second connection sheet extend along the left-right direction of the mirror body, allowing the rotation structure to rotate in the up-down direction relative to the mirror body.

[0020] Preferably, the extension structure also includes a mounting seat, a first mounting end is formed at one end of the mounting seat, a second mounting end is formed at the other end, the first connection end of the mounting seat is connected to the mirror body, and the second connection end of the mounting seat is connected to the first connection end of the first connection sheet, and the upward or downward vibration amplitude of the eyepiece relative to the mirror body can be improved through the mounting seat. After the mounting seat is attached, the adjustment amplitude of the eyepiece in the vertical direction relative to the mirror body is -100 to 110 mm.

[0021] Preferably, when the eyepiece is rotated up and down relative to the body, the eyepiece is always held horizontally.

[0022] Preferably, the second connection end of the second connection sheet is rotatably connected to the rotating structure, so that the rotating structure can rotate its own axis. In one realization manner, the surgical microscope also includes a rotating ring structure, the rotating ring structure includes a connecting ring and a rotating ring, the connecting ring and the rotating ring are installed so that they can rotate their own axis center lines correspondingly, the connecting ring is fixedly connected to the second connection end of the second connection sheet, and the rotating ring is fixedly connected to the rotating structure. A groove body is installed in the connecting ring, and the rotating ring is installed in the groove body. A plurality of grooves are installed on the outer circumferential surface of the rotating ring, one end of a positioning part is inserted into the groove through the connecting ring, and a positioning part is inserted between the connecting ring and the rotating ring. but Rotate relative to each other to lock.

[0023] More preferably, the angle by which the rotation structure rotates about its axis in response to the expansion structure is ±25°. Effect of the Invention

[0024] By applying the above technical solutions, the present invention has the following advantages over the prior art: 1. The adjustable range is wider, which can ensure that clinicians obtain an ergonomic clinical sitting posture, effectively reduce and prevent overuse injuries of the waist, neck and shoulder muscles, and let clinicians stay away from the problems of cervical spondylosis and lumbar spondylosis. 2. Provides more variety of adjustments and adapts to the dentist's own sitting posture needs. 3. The structure is simple and easy to install. [Brief description of the drawings]

[0025] [Figure 1] FIG. 2 is a schematic front view of the first embodiment of the surgical microscope in this embodiment (the eyepiece lens rotates to the top). [Diagram 2] FIG. 2 is a schematic front view of the first embodiment of the surgical microscope in this embodiment (the eyepieces rotate to a horizontal position). [Diagram 3]FIG. 2 is a schematic front view of the first embodiment of the surgical microscope in this embodiment (the eyepiece lens rotates to the bottom). [Figure 4] FIG. 13 is a schematic front view of a second embodiment of the surgical microscope in this embodiment (the eyepiece lens rotates to the top). [Diagram 5] FIG. 13 is a schematic front view of a second embodiment of the surgical microscope in this embodiment (the eyepieces rotate to a horizontal position). [Figure 6] FIG. 13 is a schematic front view of a second embodiment of the surgical microscope in this embodiment (the eyepiece lens rotates to the bottom). [Figure 7] FIG. 11 is a schematic front view of a third embodiment of the surgical microscope in this embodiment (the eyepiece lens rotates to the top). [Figure 8] FIG. 11 is a schematic front view of a third embodiment of the surgical microscope in this embodiment (the eyepieces rotate to a horizontal position). [Figure 9] 1 is a cross-sectional schematic diagram 1 of an expansion structure in this embodiment. [Figure 10] 2 is a cross-sectional schematic diagram 2 of the expansion structure in this embodiment. [Figure 11] FIG. 2 is a schematic diagram of a rotary transmission assembly in the present embodiment. [Figure 12] FIG. 2 is a schematic diagram of a rotating ring structure in the present embodiment. [Figure 13] 4 is a schematic diagram showing the rotation of a lens body relative to an eyepiece lens in this embodiment. FIG. [Figure 14] 4 is a schematic diagram showing the rotation of a lens body relative to an eyepiece lens in this embodiment. FIG. [Figure 15] FIG. 2 is a schematic diagram of an optical system in the present embodiment. [Figure 16] FIG. 2 is a schematic diagram of an optical path of an optical system in the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] The technical solutions of the present invention are described below clearly and completely with reference to the drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

[0027] In the description of the present invention, the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are directions or positional relationships indicated based on the drawings, and are only for the purpose of explaining and simplifying the description of the present invention, and do not indicate or imply that the indicated devices or elements have a specific orientation or are required to be constructed and operated in a specific orientation, and therefore do not limit the present invention. It should also be explained that the terms "first", "second", and "third" are used for explanatory purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, and unless otherwise specified and limited, the terms "attached", "interconnected" and "connected" should be understood broadly, for example, they may be fixedly connected, detachably connected, or integrally connected. They may be mechanically connected or electrically connected. It is necessary to explain that they may be directly connected, indirectly connected through an intermediate medium, or internally connected between two elements. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific situation.

[0029] The surgical microscope shown in Figures 1 to 8 includes a body 1 and an eyepiece 2 connected to the body 1, and the eyepiece 2 shown in the figures is a binocular tube, and the eyepiece 2 is connected to the body 1 via a connection structure, where the connection structure includes a rotation structure 3, i.e., the eyepiece 2 is connected to the body 1 via the rotation structure 3, and the eyepiece 2 can rotate in the vertical direction relative to the body 1, or the eyepiece 2 can vibrate in the vertical direction relative to the body 1.

[0030] In this embodiment, the connection structure also includes an extension structure 4 installed between the telescope body 1 and the eyepiece 2, the eyepiece 2 is connected to the rotation structure 3, the rotation structure 3 is connected to the extension structure 4, and the extension structure 4 is connected to the telescope body 1. The extension structure 4 satisfies the height adjustment of the lowering or raising of the eyepiece 2, increases the distance between the telescope body 1 and the eyepiece 2, and provides a larger angle of up and down adjustment in the horizontal position.

[0031] Specifically, as shown in FIGS. 9 and 10 , the expansion structure 4 includes a first connection sheet 40 and a second connection sheet 41. A first connection end 400 is formed at one end of the first connection sheet 40, and a second connection end 410 is formed at one end of the second connection sheet 41. The first connection end 400 of the first connection sheet 40 is connected to the mirror body 1, and the second connection end 410 of the second connection sheet 41 is connected to the rotation structure 3. teeth The first connecting sheet 40 and the second connecting sheet 41 are connected so as to be capable of relative rotation, and the rotation axis lines of the first connecting sheet 40 and the second connecting sheet 41 extend along the left-right direction of the mirror body 1, allowing the rotation structure 3 to rotate in the vertical direction relative to the mirror body 1, or it can be said that the rotation structure 3 vibrates in the vertical direction relative to the mirror body 1, thereby enabling the eyepiece lens 2 to rotate or vibrate in the vertical direction relative to the mirror body 1.

[0032] Between the first connection sheet 40 and the second connection sheet 41 teeth The extension structure 4 also includes a third connecting sheet 42 and a rotation transmission assembly. Here, the third connection sheet 42 is installed on at least one side of the first connection sheet 40 and the second connection sheet 41, and can be connected to the first connection sheet 40 and the second connection sheet 41 in the form of, for example, a fastener or the like. In this embodiment, since it is a binocular tube, the third connection sheets 42 on both sides are also used to install the optical system, and the third connection sheet 42 is installed on both sides of the first connection sheet 40 and the second connection sheet 41, and the first connection sheet 40 and the second connection sheet 41 are connected via the third connection sheet 42, i.e., between the first connection sheet 40 and the second connection sheet 41. but There is no direct connection.

[0033] The rotational transmission assembly is installed within the third connection sheet 42, or it can be said that the third connection sheet 42 covers the rotational transmission assembly so that the rotational transmission assembly is not exposed to the outside. As shown in FIG. 11, it includes a first transmission gear 430 and a second transmission gear 431. The first transmission gear 430 is connected to the first connection sheet 40, and the second transmission gear 431 is connected to the second connection sheet 42. The first transmission gear 430 and the second transmission gear 431 mesh with each other. In this way, when the eyepiece 2 rotates upward or downward, the first transmission gear 430 drives the second transmission gear 431 to rotate, realizing the adjustment of the angle of the eyepiece 2. However, when the rotation of the eyepiece 2 stops, the meshing of the first transmission gear 430 and the second transmission gear 431 also realizes the self-locking of both, and no rotation will occur.

[0034] Naturally, it can also be adjusted according to the torque and attenuation according to the load of the eyepiece 2 to maintain the balance of the microscope. The attenuation adjustment of the expansion structure can be tightened more. (Without affecting the comfort of operation) When rotating, lubricating washers and wave washers can be added inside to increase the frictional force during rotation, so that the microscope can maintain balance. After loading the eyepiece 2, by finely adjusting the looseness of the screw, the balance can be maintained throughout the front area, and the eyepiece 2 can be stationary in the air at any angle.

[0035] The expansion structure 4 also includes a mounting seat 44. A first mounting end 440 is formed at one end of the mounting seat 44, and a second mounting end 441 is formed at the other end. The first mounting end 440 of the mounting seat 44 is connected to the mirror body 1, and the second mounting end 441 of the mounting seat 44 is connected to the first connection end 400 of the first connection sheet 40. An included angle a is formed between the plane a where the first mounting end 440 of the mounting seat 44 is located and the plane b where the second mounting end 441 of the mounting seat 44 is located, and the range of the included angle a is 0° < a ≤ 90°, preferably 30° ≤ a ≤ 90°.

[0036] The mounting seat 44 is not necessary. A mounting base 44 is attached to the surgical microscope shown in Figures 1 to 3, and an included angle a of 90° is formed between the plane a on which the first mounting end 440 of the mounting base 44 is located and the plane b on which the second mounting end of the mounting base 44 is located.Under this structure, based on the rotation of the eyepiece 2 shown in Figure 2 to a horizontal position, the adjustment amplitude of the eyepiece 2 in the vertical direction relative to the body 1 is -100 to 100 mm, that is, the maximum amplitude of upward adjustment is 100 mm, and the maximum amplitude of downward adjustment is 100 mm.At this time, the amplitude of the eyepiece 2 vibrating in the vertical direction relative to the body 1 is maximum.

[0037] The surgical microscope shown in Figures 4 to 6 also has a mounting base 44 attached, and an included angle a of 60° is formed between the plane a on which the first mounting end 440 of the mounting base 44 is located and the plane b on which the second mounting end of the mounting base 44 is located.Under this structure, based on the rotation of the eyepiece 2 shown in Figure 5 to a horizontal position, the adjustment amplitude of the eyepiece 2 in the vertical direction relative to the body 1 is -50 to 110 mm, that is, the maximum amplitude of the upward adjustment is 110 mm, and the maximum amplitude of the downward adjustment is 50 mm.

[0038] In the surgical microscope shown in Figures 7 and 8, the first connection end 400 of the first connection sheet 40 is directly connected to the body 1, and under this structure, based on the rotation of the eyepiece 2 shown in Figure 8 to the horizontal position, the adjustment amplitude of the eyepiece 2 in the vertical direction relative to the body 1 is 0 to 55 mm, that is, the maximum upward adjustment amplitude is 55 mm, and it cannot be temporarily adjusted downward.

[0039] In this way, when the binoculars are held in a horizontal position, the height can be freely adjusted up and down, with an amplitude of about 200 mm. In contrast, an eyepiece without the extension structure 4 has an adjustment amplitude of 0 in the up and down direction relative to the body of the binoculars.

[0040] The extension structure 4, which employs the above three types of structures, always holds the eyepiece 2 horizontally when the eyepiece 2 is adjusted by rotating (vibrating) vertically relative to the body 1. The entire extension structure has a total length of 152 mm, and a total length H7 mm from the center position, so it is not too long and does not affect the operability of the user (dentist).

[0041] In this embodiment, the second connection end 410 of the second connection sheet 41 is rotatably connected to the rotating structure 3, so that the rotating structure 3 can rotate about its own axis. The rotating structure 3 is connected to the eyepiece 2, and the extension structure 4 is connected to the microscope body 1. Due to the rotation of the rotating structure 3, the microscope body 1 and the eyepiece 2 can rotate or vibrate relatively left and right. As shown in Figures 13 and 14, the eyepiece 2 is held horizontally, and the microscope body 1 rotates relative to the eyepiece 2. The angle of rotation (vibration) is ±25°, which can be an ergonomic function designed for clinicians in the dental department. The ±25° pendulum system function is that when the doctor's sitting posture is constant, that is, the eyepiece 2 is held in a horizontal observation position, and at the same time, the microscope body 1 vibrates leftward or rightward.

[0042] The rotating structure 3 is a structure that rotates its own axis relative to the expanding structure 4. In the following, the embodiment of the invention is provided, but the invention is not limited to this. The surgical microscope also includes a rotating ring structure, which includes a connecting ring 50 and a rotating ring 51, which are arranged so that they can rotate about their own axes correspondingly, specifically, a groove body 500 is arranged in the connecting ring 50, and the rotating ring 51 is arranged in the groove body 500. The connecting ring 50 is fixedly connected to the second connecting end 410 of the second connecting sheet 41, and the rotating ring 51 is fixedly connected to the rotating structure 3, thereby realizing the rotation of the microscope body 1 corresponding to the eyepiece 2.

[0043] In addition, a plurality of grooves 510 are provided on the outer circumferential surface of the rotating ring 51, and one end of a positioning part, such as a screw, is inserted into the groove 510 through the connecting ring 50, and the connecting ring 50 and the rotating ring 51 are connected to each other. butMake them rotate relative to each other and lock. The positioning component is screwed to the connecting ring 50. When the positioning component is loosened and disengaged from the groove 510, the rotating structure and the expanding structure 4 can be rotated relative to each other. After rotating to a predetermined position, the positioning component is tightened and inserted into the groove 510 again. The number of grooves 510 can be installed according to the angle that needs to be adjusted.

[0044] For the rotating structure of this application, the same structure as the extending structure can be adopted. Of course, other structures can also be adopted, which will not be further described here.

[0045] As shown in FIG. 15, an optical system is installed in the expanding structure 4, among which: optical path channels are sequentially formed inside the mounting seat, the first connection sheet, the third connection sheet and the second connection sheet, and the optical system is installed in the optical path channel to form an image forming optical path. Specifically, The optical system includes a first lens group 60, a second lens group 61, a third lens group 62 and a folding mirror group. Among them: The first lens group 60 is a doublet lens group with positive refractive power. Specifically, it includes a first lens L1 and a second lens L2 sequentially installed along the optical path direction. The first lens group 60 satisfies 30mm < fGl < 150mm, preferably 50mm < fGl < 150mm. Here, fGl is the focal length of the first lens group. At the same time, the doublet lens group of the first lens group 60

Number

[0046] The second lens group 61 is a triplet group with positive refractive power. Specifically, it includes a third lens L3, a fourth lens L4 and a fifth lens L5 sequentially installed along the optical path direction. The second lens group 61 satisfies 2 < fG2 / fGl < 10. Here, fG2 is the focal length of the second lens group.

[0047] The third lens group 62 is a doublet lens group having a positive refractive power. Specifically, it includes a sixth lens L6 and a seventh lens L7 sequentially arranged along the optical path direction. The third lens group 62 satisfies 0.5 < fG3 / fGl < 5, preferably 0.5 < fG3 / fGl < 2, where fG3 is the focal length of the third lens group. At the same time, the doublet lens group of the third lens group 62 satisfies

Number

[0048] The folding mirror group is used to change the projection direction of the light beam. The folding mirror group includes a first folding lens 63, a second folding lens 64, a third folding lens 65, and a fourth folding lens 66. In this embodiment, the first folding lens 63 is a pentaprism, and the second folding lens 64, the third folding lens 65, and the fourth folding lens 66 are corner cubes.

[0049] In this embodiment, as shown in Fig. 16, the first lens group 60, the first folding lens 63, the second folding lens 64, the third folding lens 65, the second lens group 61, the fourth folding lens 66 and the third lens group 62 are sequentially installed in the direction of the optical path, and the parallel beam enters from the first lens group 60, passes through the first folding lens 63 and the second folding lens 64, enters the third folding lens 65, and focuses on the third folding lens 65 to form a real image, and after the second lens group 61, the fourth folding lens 66 and the third lens group 62, forms and emits parallel light, and is finally observed by the eyepiece 2. Theoretically, the second lens group 61 between the third folding lens 65 and the fourth folding lens 66 does not need to be installed, but in consideration of the length of the light path, in order to obtain a better image formation effect, the second lens group 61 is installed between the third folding lens 65 and the fourth folding lens 66 in this embodiment. Similarly, theoretically, a lens group may be placed between the second folding lens 64 and the third folding lens 65, but since the first folding lens 63 uses a pentaprism and already extends the optical path, this lens group can be omitted to make the structure more compact.

[0050] In this embodiment, the first lens group 60 and the first folding lens 63 are installed in the mounting seat 44, the second folding lens 64 is installed in the first connecting sheet 40, the third folding lens 65 (which may be installed in the second connecting sheet 41) and the second lens group 61 are each installed in the third connecting sheet 42 on one side, and the fourth folding lens 66 and the third lens group 62 are installed in the second connecting sheet 41.

[0051] In the binocular tube of this embodiment, two sets of the first lens group 60, the second lens group 61, the third lens group 62 and the folding mirror group are provided.

[0052] Working Example [Table 1]

[0053] Here, the radius is the radius of curvature of the lens surface, the thickness is the thickness at the center of the lens, Nd is the refractive index of d light (wavelength 589.3 nm) in the optical glass, and Vd is the chromatic dispersion coefficient of d light (wavelength 589.3 nm).

[0054] With the above-mentioned installation, when the eyepiece 2 is used to adjust by vibrating it up and down relative to the body 1, or when the eyepiece 2 is rotated left and right relative to the body 1, the observation of the optical path is completely unaffected.

[0055] The above examples are only intended to illustrate the technical concepts and features of the present invention, and are intended to allow those skilled in the art to understand the contents of the present invention and implement it accordingly, which cannot limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included within the protection scope of the present invention.

Claims

1. An extension structure having an optical path channel formed therein, comprising a first connection sheet and a second connection sheet, a first connection end formed at one end of the first connection sheet and a second connection end formed at one end of the second connection sheet, the first connection sheet and the second connection sheet are connected to be relatively rotatable, and the rotation axis lines of the first connection sheet and the second connection sheet are parallel to each other; the expansion structure further includes a mounting seat and a third connection sheet, a first mounting end is formed at one end of the mounting seat and a second mounting end is formed at the other end, the second mounting end of the mounting seat is connected to the first connection end of the first connection sheet, and the first connection sheet and the second connection sheet are connected via the third connection sheet, the optical path channel is sequentially formed inside the mounting seat, the first connection sheet, the third connection sheet and the second connection sheet, the optical system is installed in the optical path channel, the optical system includes a first lens group, a second lens group and a third lens group, the first lens group satisfies 30 mm<fGl<150 mm, the second lens group satisfies 2<fG2 / fGl<10, and the third lens group satisfies 0.5<fG3 / fGl<5, where fGl is a focal length of the first lens group, fG2 is a focal length of the second lens group, and fG3 is a focal length of the third lens group; the first lens group being a doublet lens group having positive refractive power, the second lens group being a triplet lens group having positive refractive power, and the third lens group being a doublet lens group having positive refractive power.

2. 2. The expansion structure according to claim 1, wherein an included angle a is formed between a plane on which the first mounting end of the mounting seat is located and a plane on which the second mounting end of the mounting seat is located, and the included angle a is in the range of 0°<a≦90°.

3. 3. The expansion structure according to claim 2, wherein the range of the included angle a is 30°≦a≦90°.

4. The expansion structure according to claim 1 , wherein the first connection sheet and the second connection sheet are each rotatably connected to the third connection sheet.

5. The expansion structure according to claim 4 , wherein the third connection sheet is disposed on at least one side of the first connection sheet and the second connection sheet.

6. The expansion structure of claim 4, further comprising a rotary transmission assembly, the rotary transmission assembly including a first transmission gear and a second transmission gear, the first transmission gear being connected to the first connecting seat, the second transmission gear being connected to the second connecting seat, and the first transmission gear and the second transmission gear meshing with each other.

7. The expansion structure according to claim 6 , wherein the rotary transmission assembly is installed in the third connecting sheet.

8. An expansion structure having an optical path channel formed therein, comprising a mounting seat, a first connecting sheet, a second connecting sheet, a third connecting sheet and a rotary transmission assembly, a first mounting end is formed at one end of the mounting seat, a second mounting end is formed at the other end of the mounting seat, an included angle a is formed between a plane on which the first mounting end of the mounting seat is located and a plane on which the second mounting end of the mounting seat is located, and the included angle a is in the range of 0°<a≦90°, a first connecting end is formed at one end of the first connecting sheet, a second connecting end is formed at one end of the second connecting sheet, and the second mounting end of the mounting seat is an optical system having an extended structure, the optical system being connected to a first connection end of the first connection sheet, the first connection sheet and the second connection sheet being connected via the third connection sheet, and the first connection sheet and the second connection sheet being connected so as to be capable of relative rotation therebetween; the rotary transmission assembly being installed in the third connection sheet, the rotary transmission assembly including a first transmission gear and a second transmission gear, the first transmission gear being connected to the first connection sheet, the second transmission gear being connected to the second connection sheet, and the first transmission gear and the second transmission gear being meshed with each other; the optical path channel is sequentially formed inside the mounting seat, the first connection sheet, the third connection sheet and the second connection sheet, the optical system is installed in the optical path channel, the optical system includes a first lens group, a second lens group and a third lens group, the first lens group satisfies 30 mm<fGl<150 mm, the second lens group satisfies 2<fG2 / fGl<10, and the third lens group satisfies 0.5<fG3 / fGl<5, where fGl is a focal length of the first lens group, fG2 is a focal length of the second lens group, and fG3 is a focal length of the third lens group; the first lens group being a doublet lens group having positive refractive power, the second lens group being a triplet lens group having positive refractive power, and the third lens group being a doublet lens group having positive refractive power.

9. An optical system having an expansion structure, the expansion structure including a mounting seat, a first connection sheet, a second connection sheet and a third connection sheet, a first mounting end formed at one end of the mounting seat, a second mounting end formed at the other end, a first connection end formed at one end of the first connection sheet, a second connection end formed at one end of the second connection sheet, the second mounting end of the mounting seat connected to the first connection end of the first connection sheet, the first connection sheet and the second connection sheet connected via the third connection sheet, and the first connection sheet and the second connection sheet connected so as to be rotatable relative to each other, The optical path channel is sequentially formed inside the mounting seat, the first connection sheet, the third connection sheet and the second connection sheet, the optical system is installed in the optical path channel, the optical system includes a first lens group, a second lens group and a third lens group, and the first lens group has a focal length of 30 mm<f Ｇｌ <150 mm, and the second lens group satisfies 2<f Ｇ２ / f Ｇｌ <10, and the third lens group satisfies 0.5<f Ｇ３ / f Ｇｌ <5, where f Ｇｌ is the focal length of the first lens group, f Ｇ２ is the focal length of the second lens group, f Ｇ３ is the focal length of the third lens group, The optical system having an extended structure, wherein the first lens group is a doublet lens group having positive refractive power, the second lens group is a triplet lens group having positive refractive power, and the third lens group is a doublet lens group having positive refractive power.

10. The first lens group has a focal length of 30 mm<f Ｇｌ <150 mm, and / or the third lens group satisfies 0.5<f Ｇ３ / f Ｇｌ The optical system of claim 9, wherein the optical system satisfies the condition of <2.

11. The doublet lens group of the first lens group is [0010] where [0025] is the radius of curvature of the first lens group bonding surface, [0030] The optical system of claim 10, wherein the effective hole diameter of the bonding surface is

12. The doublet lens group of the third lens group is [0045] where [0050] is the radius of curvature of the bonding surface of the third lens group, [006] The optical system of claim 9, wherein: is an effective hole diameter of the bonding surface.

13. The optical system of claim 9, wherein the first lens group includes a first lens and a second lens arranged sequentially along the optical path direction, the second lens group includes a third lens, a fourth lens and a fifth lens arranged sequentially along the optical path direction, and the third lens group includes a sixth lens and a seventh lens arranged sequentially along the optical path direction.

14. The optical system of claim 9, further comprising a folding mirror group, the folding mirror group being used to change the projection direction of the light beam, the folding mirror group including a first folding lens, a second folding lens, a third folding lens and a fourth folding lens, and the optical path sequentially passes through the first lens group, the first folding lens, the second folding lens, the third folding lens, the second lens group, the fourth folding lens and the third lens group.

15. The optical system of claim 14, wherein the first folding lens is a pentaprism, and the second folding lens, the third folding lens and the fourth folding lens are corner cubes.

16. The optical system of expanded structure described in claim 14, characterized in that the first lens group and the first folded lens are installed in the mounting seat, the second folded lens is installed in the first connection sheet, the third folded lens is installed in the third connection sheet, the second lens group is installed in the third connection sheet or the second connection sheet, and the fourth folded lens and the third lens group are installed in the second connection sheet.

17. An optical system having an expansion structure, the expansion structure including a mounting seat, a first connection sheet, a second connection sheet and a third connection sheet, a first mounting end formed at one end of the mounting seat, a second mounting end formed at the other end, a first connection end formed at one end of the first connection sheet, a second connection end formed at one end of the second connection sheet, the second mounting end of the mounting seat connected to the first connection end of the first connection sheet, the first connection sheet and the second connection sheet connected via the third connection sheet, and the first connection sheet and the second connection sheet connected so as to be rotatable relative to each other, The optical path channel is sequentially formed inside the mounting seat, the first connection sheet, the third connection sheet and the second connection sheet, the optical system is installed in the optical path channel, the optical system includes a first lens group, a second lens group, a third lens group and a folding mirror group, the folding mirror group includes a first folding lens, a second folding lens, a third folding lens and a fourth folding lens, and the optical path sequentially includes the first lens group, the first folding lens, the second folding lens, the third folding lens and the second lens group. , a fourth folded lens and a third lens group, the first lens group and the first folded lens are installed in the mounting seat, the second folded lens is installed in the first connection sheet, the third folded lens is installed in the third connection sheet, the second lens group is installed in the third connection sheet or the second connection sheet, the fourth folded lens and the third lens group are installed in the second connection sheet, and the first lens group is a doublet lens group having a positive refractive power, [0070] the second lens group is a triplet group having positive refractive power, [0080] the third lens group is a doublet lens group having a positive refractive power, [0090] Fulfilling Where: [0010] is the focal length of the first lens group, ##EQU00011## is the focal length of the second lens group, ##EQU00012## is the focal length of the third lens group, ##EQU00013## is the radius of curvature of the first lens group bonding surface, ##EQU14## is the effective pore size of the adhesive surface, ##EQU00015## is the radius of curvature of the bonding surface of the second lens group, ##EQU00016## is the effective pore size of the adhesive surface.

18. A surgical microscope including a body and an eyepiece connected to the body, the eyepiece being connected to the body by a rotation structure so as to be rotatable in an up-down direction relative to the body, the surgical microscope also including an extension structure, the extension structure including a first connection sheet and a second connection sheet, a first connection end being formed at an end of the first connection sheet and a second connection end being formed at one end of the second connection sheet, the first connection end of the first connection sheet being connected to the body, and the second connection end of the second connection sheet being connected to the rotation structure, the first connection sheet and the second connection sheet being connected to be rotatable relative to each other, and the rotation axis lines of the first connection sheet and the second connection sheet extending along the left-right direction of the body, allowing the rotation structure to be rotatable in an up-down direction relative to the body, an optical system of an expansion structure, wherein an optical path channel is formed inside the expansion structure, the expansion structure further includes a mounting seat and a third connection sheet, a first mounting end is formed at one end of the mounting seat and a second mounting end is formed at the other end, the second mounting end of the mounting seat is connected to the first connection end of the first connection sheet, and the first connection sheet and the second connection sheet are connected via the third connection sheet; the optical path channel is sequentially formed inside the mounting seat, the first connection sheet, the third connection sheet and the second connection sheet, the optical system is installed in the optical path channel, the optical system includes a first lens group, a second lens group and a third lens group, the first lens group satisfies 30 mm<fGl<150 mm, the second lens group satisfies 2<fG2 / fGl<10, and the third lens group satisfies 0.5<fG3 / fGl<5, where fGl is a focal length of the first lens group, fG2 is a focal length of the second lens group, and fG3 is a focal length of the third lens group; 1. A surgical microscope, comprising: a first lens group that is a doublet lens group having positive refractive power; a second lens group that is a triplet lens group having positive refractive power; and a third lens group that is a doublet lens group having positive refractive power.

19. 19. The surgical microscope according to claim 18, wherein the adjustment amplitude of the eyepiece in the vertical direction relative to the body is −100 to 110 mm.

20. 20. The surgical microscope according to claim 18, wherein the eyepiece is always held horizontally when the eyepiece is rotated vertically relative to the microscope body.

21. The surgical microscope of claim 18, characterized in that the second connection end of the second connection sheet is rotatably connected to the rotating structure, allowing the rotating structure to correspondingly rotate about its own axis.

22. The surgical microscope of claim 21, further comprising a rotating ring structure, the rotating ring structure including a connecting ring and a rotating ring, the connecting ring and the rotating ring being arranged so as to be able to rotate correspondingly about their own axis lines, the connecting ring being fixedly connected to a second connection end of the second connection sheet, and the rotating ring being fixedly connected to the rotating structure.

23. The surgical microscope of claim 22, wherein a groove is provided in the connecting ring, and the rotating ring is provided in the groove.

24. The surgical microscope of claim 23, characterized in that a plurality of grooves are provided on the outer peripheral surface of the rotating ring, one end of a positioning part passes through the connecting ring and is inserted into the groove, and the connecting ring and the rotating ring rotate relative to each other to lock them in place.

25. The surgical microscope according to claim 21, characterized in that the angle at which the rotation structure rotates its axis in response to the expansion structure is ±25°.

26. A surgical microscope including a body and an eyepiece connected to the body, the eyepiece being connected to the body by a rotation structure so that the eyepiece can rotate in an up-down direction relative to the body, the surgical microscope also including an extension structure, the extension structure including a first connection sheet and a second connection sheet, the first connection sheet and the second connection sheet being connected to each other so that they can rotate relative to each other, the rotation axis lines of the first connection sheet and the second connection sheet extending along the left-right direction of the body, a first connection end being formed at one end of the first connection sheet, a second connection end being formed at one end of the second connection sheet, the first connection end of the first connection sheet being connected to the body, the second connection end of the second connection sheet being rotatably connected to the rotation structure, the rotation structure being capable of rotating itself and rotating in an up-down direction relative to the body, the eyepiece being connected to the body by a rotation structure so that the eyepiece can rotate in an up-down direction relative to the body, the surgical microscope also including an extension structure, the extension structure including a first connection sheet and a second connection sheet being connected to each other so that the eyepiece can rotate in an up-down direction relative to the body, the extension structure including a first connection sheet and a second connection sheet being connected to each other so that the eyepiece can rotate in an up-down direction relative to the body, the surgical microscope also including an extension structure, the extension structure including a first connection sheet and a second connection sheet being connected to each other so that the eyepiece can rotate in an up-down direction relative to the body, the extension structure being connected to the body by a rotation structure so that the eyepiece can rotate in an up-down direction relative to the body, the surgical microscope also including an extension structure the eyepiece has an adjustment amplitude of -100 to 110 mm in the vertical direction relative to the body, and when the eyepiece rotates in the vertical direction relative to the body, the eyepiece is always held horizontally, and the angle by which the rotation structure rotates its axis in response to the expansion structure is ±25°; the surgical microscope also includes a rotating ring structure, the rotating ring structure includes a connecting ring and a rotating ring, the connecting ring and the rotating ring are installed so as to be able to rotate their axis centers correspondingly, the connecting ring is fixedly connected to the second connecting end of the second connecting sheet, the rotating ring is fixedly connected to the rotating structure, a groove body is installed in the connecting ring, the rotating ring is installed in the groove body, and a number of grooves are installed on the outer circumferential surface of the rotating ring, one end of a positioning component is inserted into the groove through the connecting ring, and the connecting ring and the rotating ring are relatively rotated and locked; an optical system of an expansion structure, wherein an optical path channel is formed inside the expansion structure, the expansion structure further includes a mounting seat and a third connection sheet, a first mounting end is formed at one end of the mounting seat and a second mounting end is formed at the other end, the second mounting end of the mounting seat is connected to the first connection end of the first connection sheet, and the first connection sheet and the second connection sheet are connected via the third connection sheet; the optical path channel is sequentially formed inside the mounting seat, the first connection sheet, the third connection sheet and the second connection sheet, the optical system is installed in the optical path channel, the optical system includes a first lens group, a second lens group and a third lens group, the first lens group satisfies 30 mm<fGl<150 mm, the second lens group satisfies 2<fG2 / fGl<10, and the third lens group satisfies 0.5<fG3 / fGl<5, where fGl is a focal length of the first lens group, fG2 is a focal length of the second lens group, and fG3 is a focal length of the third lens group; 1. A surgical microscope, comprising: a first lens group that is a doublet lens group having positive refractive power; a second lens group that is a triplet lens group having positive refractive power; and a third lens group that is a doublet lens group having positive refractive power.

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