Optical hinge group and stereomicroscope

Abstract

The invention relates to the technical field of microscopes, in particular to an optical hinge group and a stereomicroscope, and the optical hinge group comprises a hinge seat, a first rotating body, a second rotating body and a reflection light path assembly. Wherein the back-shooting light path assembly comprises a negative lens and a positive lens group, the positive lens group is arranged between the first right-angle prism and the third right-angle prism, and the negative lens is arranged between the second right-angle prism and the third right-angle prism; by arranging the positive lens group, the aperture of a light beam is shrunk, so that the light beam can smoothly enter the first rectangular prism, and by arranging the negative lens, the aperture of the light beam is diffused, so that the light beam can fully fill the third rectangular prism, the positive lens group and the negative lens are matched to form a back-shooting light path assembly, the aperture of the light beam and an imaging azimuth angle are adjusted, and optical image stabilization is realized. The technical problems that in the prior art, an optical hinge set has large off-axis vignetting and poor imaging quality due to the fact that an optical path passes through multiple sets of prisms are solved, and the imaging quality is ensured while the observation angle is changed.

Description

Technical Field

[0001] The present invention relates to the technical field of microscopes, and in particular to an optical hinge group and a stereomicroscope. Background Art

[0002] A stereomicroscope, also known as a dissecting microscope, is an advanced visual instrument based on visible light as the illumination source. Its remarkable feature is that it can provide a positive image three-dimensional sense of the observed object, enabling the observer to more intuitively and clearly understand the three-dimensional structure of the object. Its working principle is to initially magnify the object through a precisely designed objective lens system, and then further magnify it through the eyepiece, and finally present an enlarged and depth-perceived image to the observer.

[0003] Currently, existing stereomicroscopes generally have an eyepiece, an interpupillary distance adjustment group, an optical hinge group, a continuously variable magnification objective lens group, and a light source group connected from top to bottom. Among them, the optical hinge group has two mutually rotatable right-angle prisms and a fixed right-angle prism. By rotating the mounting frame of the right-angle prism, the included angle between the two right-angle prisms is adjusted, and then the optical path deflection angle is adjusted, thereby adjusting the viewing angle of the eyepiece.

[0004] However, due to the presence of multiple prisms in the existing optical hinge group, due to the size limitations of lenses, prisms, and mechanical structures, off-axis light is partially or even completely blocked during imaging, resulting in a reduction in the light intensity at the edge part of the objective lens imaging plane and even zero, affecting the uniformity of the illuminance on the objective lens imaging plane, and a large off-axis vignetting occurs. Summary of the Invention

[0005] The purpose of the present invention is to provide an optical hinge group and a stereomicroscope to solve the technical problem in the prior art that the optical hinge group has a large off-axis vignetting and poor imaging quality due to the optical path passing through multiple groups of prisms.

[0006] In a first aspect, an optical hinge group provided by the present invention includes a hinge base, a first rotating body, a second rotating body, and a reverse shooting optical path assembly; One side of the first rotating body is rotatably arranged on the hinge base along a first direction, and the other side of the first rotating body is used to be connected to the interpupillary distance adjustment component. One side of the second rotating body is rotatably arranged on the hinge base along a second direction, and the other side of the second rotating body is used to be connected to the continuously variable magnification objective lens group. The first direction and the second direction are arranged in parallel. The first rotating body and the second rotating body are in transmission connection. A first right-angle prism is arranged in the first rotating body, a second right-angle prism is arranged in the second rotating body, and a third right-angle prism is arranged in the hinge base. The second right-angle prism is configured to reflect the object image of the continuously variable magnification objective lens group to the third right-angle prism, the third right-angle prism is configured to reflect the object image to the first right-angle prism, and the first right-angle prism is configured to reflect the object image towards the interpupillary distance adjustment component; The reverse shooting optical path component includes a negative lens and a positive lens group. The positive lens group is arranged between the first right-angle prism and the third right-angle prism, and the negative lens is arranged between the second right-angle prism and the third right-angle prism.

[0007] Further, the first rotating body includes a first rotating seat which is hollow. The first rotating seat is provided with a first light outlet along a direction perpendicular to the first direction, and the first rotating seat is provided with a first light inlet along the first direction. The first right-angle prism is arranged in the first rotating seat. The light incident surface of the first right-angle prism faces the first light inlet, and the light exit surface of the first right-angle prism faces the first light outlet.

[0008] Further, the second rotating body includes a second rotating seat which is hollow. The second rotating seat is provided with a second light inlet along a direction perpendicular to the second direction, and the second rotating seat is provided with a second light outlet along the second direction. The second right-angle prism is arranged in the second rotating seat. The light incident surface of the second right-angle prism faces the second light inlet, and the light exit surface of the second right-angle prism faces the second light outlet.

[0009] Further, one side of the first rotating seat away from the first light inlet is provided with a first hinge shaft along the first direction, and one side of the second rotating seat away from the second light outlet is provided with a second hinge shaft along the second direction. A first transmission gear is arranged on the first hinge shaft, and a second transmission gear is arranged on the second hinge shaft. The first transmission gear is meshed and connected with the second transmission gear.

[0010] Further, the optical hinge group further includes a torsion spring. One end of the torsion spring is connected to the first hinge shaft, and the other end of the torsion spring is connected to the second hinge shaft.

[0011] Further, the optical hinge group further includes a prism holder, the prism holder is disposed on one side of the first light incident port of the first rotating base, and the prism holder is disposed on one side of the second light exit port of the second rotating base. The first rotating base is rotatably disposed on the prism holder, the second rotating base is rotatably disposed on the prism holder, and the third right-angle prism is fixed to the prism holder.

[0012] Further, a first installation groove is provided at the first light incident port of the first rotating base, the positive lens group is disposed in the first installation groove, and the optical axis of the positive lens group is coaxially disposed with the incident optical path of the first right-angle prism.

[0013] Further, a second installation groove is provided at the second light exit port of the second rotating base, the negative lens is disposed in the second installation groove, and the optical axis of the negative lens is coaxially disposed with the incident optical path of the third right-angle prism.

[0014] Further, the focal length of the positive lens group is set to be from 502 mm to 615 mm; The focal length of the negative lens is set to be from -425 mm to -332 mm.

[0015] In a second aspect, the present application further provides a stereomicroscope, including an eyepiece, a continuously variable magnification objective lens group, a light source power supply cable group, a light source group, an interpupillary distance adjustment group, and the above-mentioned optical hinge group.

[0016] Compared with the prior art, an optical hinge group provided by the present invention includes a hinge base, a first rotating body, a second rotating body, and a retrofocus optical path assembly. One side of the first rotating body is rotatably arranged on the hinge base along a first direction, and the other side of the first rotating body is used to be connected to the interpupillary distance adjustment assembly. One side of the second rotating body is rotatably arranged on the hinge base along a second direction, and the other side of the second rotating body is used to be connected to the continuously variable magnification objective lens group. The first direction and the second direction are arranged in parallel. The first rotating body and the second rotating body are in transmission connection. A first right-angle prism is arranged in the first rotating body, a second right-angle prism is arranged in the second rotating body, and a third right-angle prism is arranged in the hinge base. The second right-angle prism is configured to reflect the object image of the continuously variable magnification objective lens group to the third right-angle prism, the third right-angle prism is configured to reflect the object image to the first right-angle prism, and the first right-angle prism is configured to reflect the object image towards the interpupillary distance adjustment assembly. The retrofocus optical path assembly includes a negative lens and a positive lens group. The positive lens group is arranged between the first right-angle prism and the third right-angle prism, and the negative lens is arranged between the second right-angle prism and the third right-angle prism. By arranging the positive lens group between the first right-angle prism and the third right-angle prism, the beam aperture is contracted, so that the beam can smoothly enter the first right-angle prism. At the same time, by arranging the negative lens between the second right-angle prism and the third right-angle prism, the beam aperture is diffused, so that the beam can fill the third right-angle prism. The positive lens group and the negative lens cooperate to form a retrofocus optical path assembly to adjust the beam aperture and the imaging azimuth angle, realize optical image stabilization, and control off-axis vignetting, solving the technical problem in the prior art that the optical hinge group has large off-axis vignetting and poor imaging quality due to the optical path passing through multiple groups of prisms, and ensuring the imaging quality while changing the viewing angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic diagram of the overall structure of the optical hinge group provided by the embodiment of the present invention; Figure 2 It is a cross-sectional view of the overall structure of the optical hinge group provided by the embodiment of the present invention; Figure 3 It is an exploded view of the overall structure of the optical hinge group provided by the embodiment of the present invention.

[0019] Reference numerals: 100. Hinge base; 110. Third right-angle prism; 120. Prism holder; 200, First rotating body; 210, First right-angle prism; 220, First rotating base; 221, First light-emitting port; 230, First hinge shaft; 240, First transmission gear; 300, Second rotating body; 310, Second right-angle prism; 320, Second rotating base; 321, Second light-incident port; 330, Second hinge shaft; 340, Second transmission gear; 410, Negative lens; 420, Positive lens group; 500, Torsion spring. Detailed implementation manners

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0022] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0023] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0025] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0026] Embodiment 1 As Figures 1 to 3 shown, an optical hinge group is provided in an embodiment of the present invention, including a hinge base 100, a first rotating body 200, a second rotating body 300, and a reverse imaging optical path assembly. One side of the first rotating body 200 is rotatably arranged on the hinge base 100 along a first direction, and the other side of the first rotating body 200 is used to be connected to the interpupillary distance adjustment assembly. One side of the second rotating body 300 is rotatably arranged on the hinge base 100 along a second direction, and the other side of the second rotating body 300 is used to be connected to the continuously variable magnification objective lens group. The first direction and the second direction are arranged in parallel, and the first rotating body 200 and the second rotating body 300 are in transmission connection. A first right-angle prism 210 is arranged in the first rotating body 200, a second right-angle prism 310 is arranged in the second rotating body 300, and a third right-angle prism 110 is arranged in the hinge base 100. The second right-angle prism 310 is configured to reflect the object image of the continuously variable magnification objective lens group to the third right-angle prism 110, the third right-angle prism 110 is configured to reflect the object image to the first right-angle prism 210, and the first right-angle prism 210 is configured to reflect the object image towards the interpupillary distance adjustment assembly. The reverse imaging optical path assembly includes a negative lens 410 and a positive lens group 420. The positive lens group 420 is arranged between the first right-angle prism 210 and the third right-angle prism 110, and the negative lens 410 is arranged between the second right-angle prism 310 and the third right-angle prism 110.

[0027] That is, in the optical hinge group provided by the embodiment of the present invention, a positive lens group 420 is disposed between the first right-angle prism 210 and the third right-angle prism 110, thereby shrinking the beam aperture so that the beam can smoothly enter the first right-angle prism 210. At the same time, a negative lens 410 is disposed between the second right-angle prism 310 and the third right-angle prism 110, thereby expanding the beam aperture so that the beam can fill the third right-angle prism 110. The positive lens group 420 and the negative lens 410 cooperate to form a reverse telephoto optical path assembly, adjust the beam aperture and the imaging azimuth angle, realize optical image stabilization, and control off-axis vignetting, solving the technical problem in the prior art that the optical hinge group has large off-axis vignetting and poor imaging quality due to the optical path passing through multiple groups of prisms, and ensuring the imaging quality while changing the viewing angle.

[0028] Specifically, the hinge base 100 is specifically arranged as a hollow square box body with openings at both ends. One side of the first rotating body 200 is rotatably arranged on the hinge base 100 along the first direction, and one side of the second rotating body 300 is rotatably arranged on the hinge base 100 along the second direction. In this embodiment, the first direction and the second direction are horizontal directions at different heights and are parallel to each other. The other side of the first rotating body 200 extends out of the hinge base 100 and is bolted to the interpupillary distance adjustment component, and the other side of the second rotating body 300 extends out of the hinge base 100 and is bolted to the continuously variable magnification objective lens group. Thus, the included angle between the first rotating body 200 and the second rotating body 300 can be adjusted by rotating the first rotating body 200 or the second rotating body 300. A first right-angle prism 210 is arranged in the first rotating body 200, and the incident optical axis of the first right-angle prism 210 coincides with the rotation central axis of the first rotating body 200, while the outgoing optical axis of the first right-angle prism 210 is arranged perpendicular to the first direction. Thus, the optical path of the object image can be transmitted to the interpupillary distance adjustment component connected to the first rotating body 200. A second right-angle prism 310 is arranged in the second rotating body 300, and the outgoing optical axis of the second right-angle prism 310 coincides with the rotation central axis of the second rotating body 300, while the incident optical axis of the second right-angle prism 310 is arranged perpendicular to the second direction, so as to receive the object image light beam emitted by the continuously variable magnification objective lens. A third right-angle prism 110 is fixed to the hinge base 100 and is arranged on one side of the first rotating body 200 and the second rotating body 300. Its incident optical axis coincides with the outgoing optical axis of the second right-angle prism 310, and the outgoing optical axis coincides with the incident optical axis of the first right-angle prism 210. Thus, when the first rotating body 200 and the second rotating body 300 rotate, the first right-angle prism 210 and the second right-angle prism 310 will also rotate accordingly, but the outgoing optical path and the incident optical path of the two remain unchanged, that is, the change of the observation angle is realized. A negative lens 410 is arranged between the second right-angle prism 310 and the third right-angle prism 110 to provide a negative focal length, which can diffuse the aperture of the object image light beam reflected by the second right-angle prism 310, so as to adapt it to the third right-angle prism 110. The positive lens group 420 includes a negative lens 410 and positive lenses and has a positive combined focal length, which can contract the aperture of the objective lens light beam reflected by the third right-angle prism 110, so as to adapt it to the first right-angle prism 210. The negative lens 410 and the positive lens group 420 cooperate with each other to adjust the light beam aperture, so as to adapt to the prism model, reduce off-axis vignetting, and improve the imaging quality.

[0029] Preferably, the focal length of the positive lens group 420 is set to be 502 mm to 615 mm; the focal length of the negative lens 410 is set to be -425 mm to -332 mm.

[0030] Specifically, in this embodiment, the focal length of the positive lens group 420 is set to 558 mm, and the focal length of the negative lens 410 is set to -387 mm. By controlling the focal lengths of the positive lens group 420 and the negative lens 410, the magnification of the whole machine can be adjusted, so as to cooperate with other lenses in the entity microscope to meet the requirement that the whole machine has a focal length of 175 mm. Thus, the requirements for the focal length and the field of view range of the whole machine are met.

[0031] Further, the first rotating body 200 includes a first rotating base 220. The first rotating base 220 is hollow. The first rotating base 220 is provided with a first light outlet 221 along a direction perpendicular to the first direction. The first rotating base 220 is provided with a first light inlet along the first direction. The first right-angle prism 210 is disposed in the first rotating base 220. The light incident surface of the first right-angle prism 210 faces the first light inlet, and the light outlet surface of the first right-angle prism 210 faces the first light outlet 221.

[0032] Specifically, the first rotating base 220 is hollow, and the first right-angle prism 210 is fixed in the hollow cavity of the first rotating base 220. The first rotating base 220 is provided with a first light outlet 221 along a direction perpendicular to the first direction. The first rotating base 220 is provided with a first light inlet along the first direction. The light incident surface of the first right-angle prism 210 faces the first light inlet, and the light outlet surface of the first right-angle prism 210 faces the first light outlet 221. Thus, the first right-angle prism 210 can receive the object image light beam from the first light inlet and emit the object image light beam from the first light outlet 221, changing the direction of the object image.

[0033] Further, the second rotating body 300 includes a second rotating base 320. The second rotating base 320 is hollow. The second rotating base 320 is provided with a second light inlet 321 along a direction perpendicular to the second direction. The second rotating base 320 is provided with a second light outlet along the second direction. The second right-angle prism 310 is disposed in the second rotating base 320. The light incident surface of the second right-angle prism 310 faces the second light inlet 321, and the light outlet surface of the second right-angle prism 310 faces the second light outlet.

[0034] Specifically, the second rotating base 320 is hollow, and the second right-angle prism 310 is fixed in the hollow cavity of the second rotating base 320. The second rotating base 320 is provided with a second light outlet along a direction perpendicular to the second direction. The second rotating base 320 is provided with a second light inlet 321 along the second direction. The light incident surface of the second right-angle prism 310 faces the second light inlet 321, and the light outlet surface of the second right-angle prism 310 faces the second light outlet. Thus, the second right-angle prism 310 can receive the object image light beam from the second light inlet 321 and emit the object image light beam from the second light outlet, changing the direction of the object image.

[0035] Further, a first hinge shaft 230 is disposed on a side of the first rotating base 220 away from the first light incident port along a first direction, and a second hinge shaft 330 is disposed on a side of the second rotating base 320 away from the second light exit port along a second direction. A first transmission gear 240 is disposed on the first hinge shaft 230, and a second transmission gear 340 is disposed on the second hinge shaft 330. The first transmission gear 240 and the second transmission gear 340 are meshed and connected.

[0036] Specifically, the first hinge shaft 230 is disposed on a side wall of the first rotating base 220 and is disposed along the first direction. The second hinge shaft 330 is disposed on a side wall of the second rotating base 320 and is disposed along the second direction. The first transmission gear 240 is disposed on the first hinge shaft 230, and the second transmission gear 340 is disposed on the second hinge shaft 330. The transmission ratio of the first transmission gear 240 and the second transmission gear 340 can be set to 1:1, or can be specifically set according to the required adjustment efficiency. Through the meshing of the first transmission gear 240 and the second transmission gear 340, the first rotating base 220 and the second rotating base 320 can be adjusted simultaneously. Through the synchronous rotation between the two, it is ensured that the first right-angle prism 210 and the second right-angle prism 310 rotate synchronously, compensating the imaging azimuth angle, stabilizing the optical image, and ensuring the azimuth of the output image.

[0037] Further, the optical hinge group further includes a torsion spring 500. One end of the torsion spring 500 is connected to the first hinge shaft 230, and the other end of the torsion spring 500 is connected to the second hinge shaft 330.

[0038] Specifically, one end of the torsion spring 500 is connected to the first hinge shaft 230, and the other end of the torsion spring 500 is connected to the second hinge shaft 330. By providing the torsion spring 500 on the first hinge shaft 230 and the second hinge shaft 330, a certain damping effect can be provided for the rotation of the hinge shaft and the second hinge shaft 330, ensuring stable transmission between the two.

[0039] Further, the optical hinge group further includes a prism holder 120. The prism holder 120 is disposed on a side of the first light incident port of the first rotating base 220, and the prism holder 120 is disposed on a side of the second light exit port of the second rotating base 320. The first rotating base 220 is rotatably disposed on the prism holder 120, the second rotating base 320 is rotatably disposed on the prism holder 120, and the third right-angle prism 110 is fixed to the prism holder 120.

[0040] Specifically, the prism holder 120 is integrally in the shape of "∞". On one side of the prism holder 120, there are two circular fixing holes. One of the fixing holes is rotatably arranged on one side of the first light inlet of the first rotating base 220, and the other fixing hole is rotatably arranged on one side of the second light outlet of the second rotating base 320, so that the first rotating base 220 and the second rotating base 320 are rotatably arranged on the prism holder 120. On the other side of the prism holder 120, a third right-angle prism 110 is fixed. The object image optical path reflected by the second right-angle prism 310 can enter the third right-angle prism 110 through one of the fixing holes, and the object image optical path reflected by the third right-angle prism 110 can enter the first right-angle prism 210 through the other fixing hole. A clearance eliminating cotton is also arranged between the prism holder 120 and the third right-angle prism 110 to ensure the firm fixation of the third right-angle prism 110. By setting the prism holder 120, the optical axis position intervals and the vertical axis concentricity of each right-angle prism can be effectively ensured.

[0041] Further, a first installation groove is arranged at the first light inlet of the first rotating base 220. The positive lens group 420 is arranged in the first installation groove, and the optical axis of the positive lens group 420 is coaxially arranged with the incident optical path of the first right-angle prism 210.

[0042] Specifically, the first installation groove is arranged as a circular groove. The positive lens group 420 is fixedly arranged in the first installation groove, and the optical axis of the positive lens group 420 is coaxially arranged with the incident optical path of the first right-angle prism 210. In this embodiment, the positive lens group 420 is arranged as spaced positive lenses and negative lenses 410, and a spacer is arranged between them. Thus, it can be ensured that the positive lens group 420 can be stably arranged between the first right-angle lens and the third right-angle lens, and the beam aperture is reduced.

[0043] Further, a second installation groove is arranged at the second light outlet of the second rotating base 320. The negative lens 410 is arranged in the second installation groove, and the optical axis of the negative lens 410 is coaxially arranged with the incident optical path of the third right-angle prism 110.

[0044] Specifically, the second installation groove is arranged as a circular groove. The negative lens 410 is fixedly arranged in the second installation groove, and the optical axis of the negative lens 410 is coaxially arranged with the incident optical path of the third right-angle prism 110. Thus, it can be ensured that the positive lens group 420 can be stably arranged between the first right-angle lens and the third right-angle lens, and the beam aperture is reduced.

[0045] Embodiment 2 In a second aspect, the present application further provides a stereomicroscope, which includes an eyepiece, a continuously variable magnification objective lens group, a light source power supply cable group, a light source group, an interpupillary distance adjustment group, and the above-mentioned optical hinge group. The eyepiece, the continuously variable magnification objective lens group, the light source power supply cable group, the light source group, and the interpupillary distance adjustment group provided in this embodiment are all well-known prior arts in the art, and the optical hinge group in this embodiment has been fully described in the above-mentioned Embodiment 1, so it will not be elaborated in this embodiment.

[0046] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optical hinge group, characterized in that, It includes a hinge base (100), a first rotating body (200), a second rotating body (300) and a reverse shooting optical path assembly; One side of the first rotating body (200) is rotatably arranged on the hinge base (100) along a first direction, the other side of the first rotating body (200) is used to be connected with a pupil distance adjustment assembly, one side of the second rotating body (300) is rotatably arranged on the hinge base (100) along a second direction, the other side of the second rotating body (300) is used to be connected with a continuously variable magnification objective lens group, the first direction and the second direction are arranged in parallel, the first rotating body (200) and the second rotating body (300) are in transmission connection, a first right-angle prism (210) is arranged in the first rotating body (200), a second right-angle prism (310) is arranged in the second rotating body (300), a third right-angle prism (110) is arranged in the hinge base (100), the second right-angle prism (310) is configured to reflect the object image of the continuously variable magnification objective lens group to the third right-angle prism (110), the third right-angle prism (110) is configured to reflect the object image to the first right-angle prism (210), and the first right-angle prism (210) is configured to reflect the object image towards the pupil distance adjustment assembly; The reverse shooting optical path assembly includes a negative lens (410) and a positive lens group (420), the positive lens group (420) is arranged between the first right-angle prism (210) and the third right-angle prism (110), and the negative lens (410) is arranged between the second right-angle prism (310) and the third right-angle prism (110).

2. The optical hinge group according to claim 1, characterized in that, The first rotating body (200) includes a first rotating seat (220), the first rotating seat (220) is hollow, the first rotating seat (220) is provided with a first light outlet (221) along a direction perpendicular to the first direction, the first rotating seat (220) is provided with a first light inlet along the first direction, the first right-angle prism (210) is arranged in the first rotating seat (220), the incident light surface of the first right-angle prism (210) faces the first light inlet, and the outgoing light surface of the first right-angle prism (210) faces the first light outlet (221).

3. The optical hinge group according to claim 2, wherein The second rotating body (300) includes a second rotating seat (320), the second rotating seat (320) is hollow, the second rotating seat (320) is provided with a second light inlet (321) along a direction perpendicular to the second direction, the second rotating seat (320) is provided with a second light outlet along the second direction, the second right-angle prism (310) is arranged in the second rotating seat (320), the incident light surface of the second right-angle prism (310) faces the second light inlet (321), and the outgoing light surface of the second right-angle prism (310) faces the second light outlet.

4. The optical hinge group according to claim 3, wherein On one side of the first rotating seat (220) away from the first light input port, a first hinge shaft (230) is arranged along a first direction. On one side of the second rotating seat (320) away from the second light output port, a second hinge shaft (330) is arranged along a second direction. A first transmission gear (240) is arranged on the first hinge shaft (230), and a second transmission gear (340) is arranged on the second hinge shaft (330). The first transmission gear (240) is meshed and connected with the second transmission gear (340).

5. The optical hinge group according to claim 4, wherein, The optical hinge group further includes a torsion spring (500). One end of the torsion spring (500) is connected to the first hinge shaft (230), and the other end of the torsion spring (500) is connected to the second hinge shaft (330).

6. The optical hinge group according to claim 4, wherein The optical hinge group further includes a prism holder (120). The prism holder (120) is arranged on one side of the first light input port of the first rotating seat (220), and the prism holder (120) is arranged on one side of the second light output port of the second rotating seat (320). The first rotating seat (220) is rotatably arranged on the prism holder (120), the second rotating seat (320) is rotatably arranged on the prism holder (120), and the third right-angle prism (110) is fixed to the prism holder (120).

7. The optical hinge group according to any one of claims 3-6, characterized in that, A first installation groove is arranged at the first light input port of the first rotating seat (220). The positive lens group (420) is arranged in the first installation groove. The optical axis of the positive lens group (420) is coaxially arranged with the incident light path of the first right-angle prism (210).

8. The optical hinge group according to any one of claims 3-6, characterized in that A second installation groove is arranged at the second light output port of the second rotating seat (320). The negative lens (410) is arranged in the second installation groove. The optical axis of the negative lens (410) is coaxially arranged with the incident light path of the third right-angle prism (110).

9. The optical hinge set according to any one of claims 2-6, characterized in that, The focal length of the positive lens group (420) is set to be from 502 mm to 615 mm; The focal length of the negative lens (410) is set to be from -425 mm to -332 mm.

10. A stereomicroscope, characterized in that, It includes an eyepiece, a continuously variable magnification objective lens group, a light source power supply cable group, a light source group, an interpupillary distance adjustment group, and the optical hinge group according to any one of claims 1-9.

Images