A multi-lens microscope focusing mechanism

Abstract

The utility model discloses a kind of multi-objective microscope focusing mechanism, including mounting bracket, the upside of mounting bracket is equipped with first motor of upside-down, the below of first motor is connected with clearance compensation structure, the below of clearance compensation structure is equipped with carousel, the below of carousel is installed with objective lens, carousel is connected with objective lens switching structure, and there is speed reduction structure between first motor and clearance compensation structure;Clearance compensation structure includes screw rod, first ball nut and second ball nut are equipped with and screw with it on screw rod, at least two guide rods are connected between first ball nut and second ball nut, spring is set on each guide rod and is sleeved with.The beneficial effects of the utility model are: the gap of screw rod and ball nut can be automatically compensated, the initial reverse gap can be eliminated, and the gap caused by real-time compensation wear, temperature deformation can be eliminated, so that the adjustment of objective lens can keep accuracy for a long time, manual disassembly adjustment is not needed, maintenance cost is reduced, service life is improved, while manufacturing cost is low, assembly difficulty is low.

Description

Technical Field

[0001] This utility model relates to the field of focusing system technology, specifically a focusing mechanism for a multi-objective microscope. Background Technology

[0002] The focusing system is a biomimetic module used to adjust the relative positions of the lens group and the photosensitive element in an optical imaging device. Its core function mimics the physiological mechanism by which the human eye achieves clear imaging through parallax perception and adjustment of lens thickness. There are four main focusing methods in microscopes, including:

[0003] (1) Traditional microscopes rely on manual focusing by adjusting the coarse and fine focus knobs. This is common in stereomicroscopes and is usually manually focused. However, manual focusing severely limits the application scenarios of microscopes.

[0004] (2) The microscope focusing knob electric adjuster is fixed on the traditional microscope coarse and fine focusing knob for focusing. It is controlled by electric motor, but it depends on the traditional microscope structure, which is not conducive to the design of new microscopes.

[0005] (3) The microscope can be focused by moving the stage up and down through the electric Z-axis of the digital microscope, but the size of the stage is highly limited and the application scenarios are restricted.

[0006] (4) The LAF laser autofocus can automatically focus during movement and is suitable for some microscanners. It can automatically focus and scan. However, this type of autofocus is more used for semiconductor detection. It is easy to lose focus when used for biological sample detection. It is also expensive, has a complex structure, and has high maintenance costs.

[0007] However, in the focusing of microscopes for equipment that requires high precision but has moderate load and no extreme rigidity requirements (such as precision assembly machines, laser marking machines, and small CNC machine tools in the 3C industry), the above focusing methods cannot meet the usage requirements. Utility Model Content

[0008] The purpose of this invention is to provide a focusing mechanism for a multi-objective microscope to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, this utility model provides the following technical solution: a multi-objective microscope focusing mechanism, including a mounting frame, an inverted first motor above the mounting frame, a gap-eliminating structure connected below the first motor, a turntable below the gap-eliminating structure, a plurality of objectives evenly spaced along its circumference mounted below the turntable, an objective lens switching structure connected to the turntable, and a speed reduction structure between the first motor and the gap-eliminating structure;

[0010] The backlash elimination structure includes a vertically arranged lead screw, on which a first ball nut and a second ball nut are screwed. The first ball nut is located below the second ball nut. At least two guide rods are connected between the first ball nut and the second ball nut. Each guide rod is fitted with a spring, and the upper and lower ends of the spring abut against the second ball nut and the first ball nut, respectively.

[0011] Further optimization involves a fixing block in the middle of the mounting bracket, a sliding objective lens switching structure mounted on the fixing block, and a deceleration structure fixed above the fixing block.

[0012] Further optimization involves an objective lens switching structure comprising a sliding seat slidably mounted on a fixed block. A first ball bearing nut is mounted on the sliding seat, and an inverted second motor is mounted on the sliding seat. The lower output shaft of the second motor is connected to a drive pulley, which is connected to a driven pulley via a synchronous belt. The driven pulley is connected to a connecting seat fixed to a turntable, and the connecting seat is rotatably connected to the sliding seat. The second motor drives the drive pulley to rotate, which in turn drives the driven pulley to rotate via the drive pulley and synchronous belt. The driven pulley then drives the connecting seat to rotate, ultimately rotating the turntable.

[0013] Further optimization involves the lower end of the lead screw passing through the sliding seat, connecting seat, and turntable and connected to a guide tube. The guide tube is vertically mounted on the mounting frame and movably connected to the turntable. The guide tube limits and supports the lead screw, ensuring its stability. A clearance hole is provided on the turntable at the position corresponding to the guide tube.

[0014] Further optimization involves connecting first bearings to both the upper and lower ends of the lead screw to ensure smooth rotation of the lead screw. The two first bearings are respectively connected to the fixed block and the guide tube.

[0015] Further optimization involves connecting the sliding seat and the fixed block with a linear guide rail, ensuring that the sliding seat can move precisely up and down along the fixed block.

[0016] Further optimization involves a reduction structure comprising a sun gear connected to the output shaft of a first motor and a connecting rod connected to a lead screw. The sun gear is meshed with a plurality of planet gears evenly spaced apart. A planetary plate is rotatably connected below the planet gears. The connecting rod is mounted below the planetary plate. A gear cover is provided on the outer side of the planet gears. A gear ring that meshes with the planet gears is provided on the inner wall of the gear cover. A lower cover is connected below the gear cover.

[0017] In a further optimization, the number of planetary gears is three, and the three planetary gears are arranged in an equilateral triangle around the sun gear, with the central axis of the connecting rod coinciding with the central axis of the sun gear.

[0018] Further optimization involves installing a second bearing on the connecting rod, which is mounted on the gear cover. The speed ratio of the reduction structure is 1:50, enabling sub-micron level precision adjustment.

[0019] Beneficial effects: The focusing mechanism of this multi-objective microscope achieves up-and-down movement of the objective lens through a backlash-eliminating structure, thereby adjusting the focal length of the objective lens. The backlash-eliminating structure can automatically compensate for the gap between the lead screw and the ball nut, eliminating the initial backlash and compensating for the gap caused by wear and temperature deformation in real time. This allows the objective lens to maintain its accuracy over a long period of time without the need for manual disassembly and adjustment, reducing maintenance costs and extending service life. It can cope with complex working conditions such as load fluctuations and temperature changes, and avoids the repeated occurrence of gaps due to changes in external conditions. At the same time, it has low manufacturing cost and low assembly difficulty.

[0020] The objective lens switching structure enables automatic switching of the objective lens; the deceleration structure and the backlash elimination structure enable the overall motion accuracy to reach the sub-micron level, resulting in high movement accuracy and high focusing accuracy of the objective lens.

[0021] The focusing mechanism has a relatively simple structure, low cost, relatively high focusing accuracy, simple operation, and long service life; at the same time, it can achieve automatic focusing, has a wide range of applications, and maintains high accuracy. Attached Figure Description

[0022] Figure 1 This is a cross-sectional structural schematic diagram of the focusing mechanism of the multi-objective microscope disclosed in the embodiments of this utility model;

[0023] Figure 2 This is a schematic diagram of an isometric structure of the focusing mechanism of the multi-objective microscope disclosed in an embodiment of the present invention.

[0024] Figure 3 This is an axonometric structural schematic diagram of the multi-objective microscope focusing mechanism disclosed in an embodiment of the present invention from another perspective.

[0025] Figure 4 This is a schematic diagram of the front view structure of the focusing mechanism of the multi-objective microscope disclosed in the embodiment of this utility model;

[0026] Figure 5 This is a schematic diagram of the gap-eliminating structure disclosed in the embodiments of this utility model;

[0027] Figure 6 This is a schematic diagram of the cooperation structure between the first motor and the reduction gear structure disclosed in the embodiment of this utility model.

[0028] Reference numerals: 1-Mounting bracket, 2-First motor, 3-Backlash elimination structure, 31-Lead screw, 32-First ball nut, 33-Second ball nut, 34-Guide rod, 35-Spring, 36-First bearing, 4-Turntable, 41-Clearing hole, 5-Objective lens, 6-Objective lens switching structure, 61-Sliding seat, 62-Second motor, 63-Driving pulley, 64-Driven pulley, 65-Synchronous belt, 66-Connecting seat, 7-Reduction structure, 71-Sun gear, 72-Planet gear, 73-Planet plate, 74-Connecting rod, 75-Second bearing, 76-Gear cover, 77-Lower cover, 8-Guide tube, 9-Fixing block, 10-Linear bearing. Detailed Implementation

[0029] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0030] Please refer to Figure 1-4 and Figure 6 As shown, a focusing mechanism for a multi-objective microscope includes a mounting frame 1. An inverted first motor 2 is mounted above the mounting frame 1. A gap-eliminating structure 3 is connected below the first motor 2. A turntable 4 is located below the gap-eliminating structure 3. Several objectives 5 are mounted below the turntable 4 and evenly spaced along its circumference. An objective lens switching structure 6 is connected to the turntable 4. The objective lens switching structure 6 is connected to the gap-eliminating structure 3. A speed reduction structure 7 is provided between the first motor 2 and the gap-eliminating structure 3.

[0031] The backlash elimination structure 3 includes a vertically arranged lead screw 31. The lead screw 31 is provided with a first ball nut 32 and a second ball nut 33 that are screwed to it. The first ball nut 32 is located below the second ball nut 33. At least two guide rods 34 are connected between the first ball nut 32 and the second ball nut 33. Each guide rod 34 is fitted with a spring 35. The upper and lower ends of the spring 35 abut against the second ball nut 33 and the first ball nut 32, respectively.

[0032] In this application, the focusing mechanism is used for focusing the objective lens 5 of a microscope. The focusing operation of moving the objective lens 5 is achieved through a first motor 2, a backlash elimination structure 3, and an objective lens switching structure 6. Specifically, the first motor 2 drives the backlash elimination structure 3 to move up and down, which in turn drives the turntable 4 and the objective lens 5 mounted on it to move up and down, thus achieving fine-tuning of the focal length of the objective lens 5. The backlash elimination structure 3 can achieve dynamic compensation for the objective lens 5, eliminating backlash in the initial state and during use, including compensation for gaps caused by wear or deformation. This ensures the microscope maintains its accuracy during long-term use and can cope with complex working conditions such as load fluctuations and temperature changes, preventing the gap from repeatedly appearing due to changes in external conditions. The objective lens switching structure 6 drives the turntable 4 to rotate, thereby achieving the rotational switching of the objective lens 5 mounted on it. The speed reduction structure 7 is used to reduce the rotational speed transmitted by the first motor 2. It is located between the output shaft of the first motor 2 and the backlash elimination structure 3. It reduces the rotation of the lead screw 31 of the backlash elimination structure 3, and finally realizes the up-and-down movement adjustment of the objective lens 5.

[0033] The backlash elimination structure 3 includes a lead screw 31 and a first ball nut 32 and a second ball nut 33 screwed onto the lead screw 31. The upper end of the lead screw 31 is connected to a reduction structure 7, which reduces the rotational speed of the first motor 2, making the rotational speed of the lead screw 31 lower than the rotational speed of the output shaft of the first motor 2. The lead screw 31 can drive the first ball nut 32 and the second ball nut 33 to rotate, converting the rotation of the lead screw 31 into the linear motion of the first ball nut 32 and the second ball nut 33. The linear motion of the first ball nut 32 drives the turntable 4 to move up and down, ultimately achieving the up and down movement of the objective lens 5 and realizing the focus adjustment of the objective lens 5. The arrangement of the first ball nut 32, the second ball nut 33, the guide rod 34, and the spring 35 allows the spring 35 to simultaneously generate a preload force on both the first ball nut 32 and the second ball nut 33. Specifically, it generates a downward preload force on the first ball nut 32 and an upward preload force on the second ball nut 33, ensuring that both the first ball nut 32 and the second ball nut 33 are fully engaged with the threaded raceway of the lead screw 31. This eliminates the axial clearance between the first ball nut 32 and the lead screw 31, as well as the axial clearance between the second ball nut 33 and the lead screw 31, thus eliminating the reverse clearance between the first ball nut 32, the second ball nut 33, and the lead screw 31.

[0034] Even after prolonged use, wear may occur between the raceway of the lead screw 31, the first ball nut 32, and the second ball nut 33, or new minute gaps may be created due to axial expansion and contraction of the lead screw 31 caused by temperature changes. Under the action of the spring 35, the elastic potential energy released by the spring 35 will push the first ball nut 32 and the second ball nut 33 to automatically "follow" the minute distance, re-tighten the raceway of the lead screw 31, fill the gap, and always maintain the pre-tightened state. No manual disassembly and adjustment are required, realizing "self-compensation," that is, dynamic compensation, including wear compensation and deformation compensation. The reverse gap between the ball nut and the lead screw 31 is eliminated in real time, improving focusing accuracy and ensuring continuous operation of the microscope.

[0035] In this application, there are four guide rods 34, and four corresponding springs 35. The four guide rods 34 are arranged in a rectangular array to ensure the relative stability of the position between the second ball nut 33 and the first ball nut 32, thereby ensuring the stability of the preload of the springs 35. Furthermore, the elastic preload of the springs 35 can buffer impact loads, reduce impact wear on the lead screw 31 and the ball nuts, extend the service life of the backlash elimination structure 3, and ultimately extend the service life of the microscope.

[0036] Please refer to Figure 2-3 As shown, in one embodiment of this application, a fixing block 9 is provided in the middle of the mounting bracket 1, the objective lens switching structure 6 is slidably disposed on the fixing block 9, and the deceleration structure 7 is fixed above the fixing block 9. That is, the installation and support of the deceleration structure 7 and the objective lens switching structure 6 are realized through the structural arrangement of the fixing block 9.

[0037] Please refer to Figure 1 As shown, in another embodiment of this application, the objective lens switching structure 6 includes a sliding seat 61 slidably disposed on the fixed block 9, a first ball nut 32 is mounted on the sliding seat 61, an inverted second motor 62 is mounted on the sliding seat 61, the lower output shaft end of the second motor 62 is connected to a drive pulley 63, the drive pulley 63 is connected to a driven pulley 64 through a synchronous belt 65, the driven pulley 64 is connected to a connecting seat 66 fixed on the turntable 4, and the connecting seat 66 is rotatably connected to the sliding seat 61.

[0038] In this embodiment, the sliding seat 61 can slide relative to the fixed block 9 and is connected to the first ball nut 32 of the backlash elimination structure 3. When the first ball nut 32 moves up and down linearly along the lead screw 31, it can drive the sliding seat 61 to move up and down along the fixed block 9, ensuring that the objective lens switching structure 6 moves up and down synchronously with the first ball nut 32, the turntable 4, and the objective lens 5, and ensuring that the objective lens switching structure 6 can effectively adjust the rotation of the objective lens 5. The second motor 62 is installed above the sliding seat 61, the connecting seat 66 is installed below the sliding seat 61, and the driven pulley 64 is installed on the connecting seat 66, ensuring that the second motor 62, the driving pulley 63, the driven pulley 64, the synchronous belt 65, and the connecting seat 66 can move up and down synchronously with the sliding seat 61. The second motor 62 can drive the active pulley 63 to rotate. The active pulley 63 and the synchronous belt 65 drive the driven pulley 64 to rotate synchronously. The driven pulley 64 can drive the connecting seat 66 to rotate synchronously. The rotation of the connecting seat 66 drives the rotation of the turntable 4, and finally drives the objective lens 5 installed on the turntable 4 to rotate, thereby achieving the switching of the objective lens.

[0039] In this embodiment, the second motor 62 is a stepper motor with an encoder. The encoder is a circular 1000-line grating encoder with a zero position. The objective lens 5 rotates one revolution to find the grating 0 position signal and complete the reset. According to the grating signal, one objective lens 5 can be switched every 1 / 4 revolution. Through the 1000-line grating, the objective lens 5 switching accuracy of 0.36 degrees is achieved, which is 30% higher than the accuracy of the traditional bayonet type.

[0040] Please continue to refer to Figure 1 As shown, further, the lower end of the lead screw 31 passes through the sliding seat 61, the connecting seat 66, and the turntable 4 and is connected to a guide tube 8. The guide tube 8 is vertically mounted on the mounting bracket 1 and movably connected to the turntable 4. A clearance hole 41 is provided on the turntable 4 corresponding to the position of the guide tube 8. That is, through the structural design of the guide tube 8, the lead screw 31 can be guided and limited, ensuring the stability and fixed position of the lead screw 31, thereby ensuring the vertical adjustment accuracy of the objective lens 5 and the focusing accuracy of the objective lens 5; at the same time, it can also position and limit the turntable 4, ensuring that the axial direction of the turntable 4 does not change, thus ensuring the positional accuracy of the objective lens 5. The clearance hole 41 is designed to allow the turntable 4 to move vertically relative to the guide tube 8, thereby ensuring the effective vertical movement of the turntable 4, that is, ensuring the effective focusing of the objective lens 5.

[0041] Please refer to Figure 1 and Figure 5 As shown, furthermore, both the upper and lower ends of the lead screw 31 are connected to first bearings 36. The two first bearings 36 are respectively connected to the fixed block 9 and the guide tube 8. That is, the setting of the two first bearings 36 ensures that the lead screw 31 rotates smoothly.

[0042] Based on the above scheme, a linear guide rail 10 is further connected between the sliding seat 61 and the fixed block 9 to ensure that the sliding seat 61 moves up and down smoothly and accurately.

[0043] Please refer to Figure 1-2 and Figure 6 As shown, in another embodiment of this application, the reduction structure 7 includes a sun gear 71 connected to the output shaft of the first motor 2 and a connecting rod 74 connected to the lead screw 31. The sun gear 71 is meshed with a plurality of planet gears 72 that are evenly spaced apart. A planet plate 73 is rotatably connected below the planet gears 72. The connecting rod 74 is installed below the planet plate 73. A gear cover 76 is provided on the outer side of the planet gears 72. A gear ring that meshes with the planet gears 72 is provided on the inner wall of the gear cover 76. A lower cover 77 is connected to the lower side of the gear cover 76.

[0044] In this embodiment, the reduction structure 7 is a planetary gear transmission structure, consisting of a sun gear 71, planet gears 72, a planetary plate 73, and a gear cover 76. The first motor 2 drives the sun gear 71 to rotate, and the planet gears 72 rotate under the drive of the sun gear 71. The sun gear 71 drives the planet gears 72 to rotate along the gear ring on the inner wall of the gear cover 76, causing the planetary plate 73 to rotate synchronously with the planet gears 72, thus achieving the reduction function. The rotation of the planetary plate 73 drives the connecting rod 74 to rotate synchronously, and the connection between the connecting rod 74 and the lead screw 31 drives the lead screw 31 to rotate synchronously, ultimately achieving the vertical adjustment of the objective lens 5. The gear cover 76 is used to enclose the planet gears 72 and mesh with them, restricting the free rotation direction of the planet gears 72, causing them to move in a circle along the gear ring of the gear cover 76. The lower cover 77 is used to fit the gear cover 76, covering the sun gear 71, planet gear 72, and planet plate 73 within the cavity space formed by the lower cover 77 and the gear cover 76, thus protecting the sun gear 71, planet gear 72, and planet plate 73 and preventing dust and other contaminants from entering.

[0045] Please refer to Figure 6 As shown, furthermore, there are three planetary gears 72, arranged in an equilateral triangle around the sun gear 71, with the central axis of the connecting rod 74 coinciding with the central axis of the sun gear 71. The three planetary gears 72 can share the transmission load, achieving higher torque density, bearing greater torque in a compact size, and with multiple gears meshing simultaneously, resulting in higher transmission efficiency. Simultaneously, the load is distributed across the three planetary gears 72, making the transmission smoother, with less vibration and lower noise. The connecting rod 74 acts as an output shaft. The output shaft of the first motor 2 on the central axis of the sun gear 71 is on the same straight line as the central axis of the connecting rod 74, ensuring that the connecting rod 74 can rotate around its central axis without eccentric rotation, guaranteeing the effective rotation of the lead screw 31, and facilitating integration into the gear cover 76. Furthermore, the number of planetary gears 72 is not limited to three; it can also be two, four, five, or more.

[0046] Furthermore, a second bearing 75 is fitted onto the connecting rod 74 and mounted on the gear cover 76. The speed ratio of the reduction structure 7 is 1:50. The second bearing 75 ensures smooth and stable rotation of the connecting rod 74 and maintains its position. The speed ratio of the reduction structure 7 is 1:50, and the first motor 2 is a stepper motor, so that the first motor 2 rotates 0.02mm per revolution. The first motor 2 rotates 200 times per revolution, achieving a theoretical accuracy of 0.1µm. Through the reduction structure 7, the backlash-free structure 3 can drive the objective lens 5 to achieve a sub-micron level of motion accuracy, i.e., 0.1µm.

[0047] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A focusing mechanism for a multi-objective microscope, comprising a mounting bracket (1), characterized in that: The mounting bracket (1) is equipped with an inverted first motor (2) above it. The first motor (2) is connected to a gap-eliminating structure (3) below it. The gap-eliminating structure (3) is equipped with a turntable (4) below it. Several objective lenses (5) are evenly spaced along its circumference below the turntable (4). The turntable (4) is connected to an objective lens switching structure (6). The objective lens switching structure (6) is connected to the gap-eliminating structure (3). A speed reduction structure (7) is provided between the first motor (2) and the gap-eliminating structure (3). The backlash elimination structure (3) includes a vertically arranged lead screw (31). The lead screw (31) is provided with a first ball nut (32) and a second ball nut (33) screwed to it. The first ball nut (32) is located below the second ball nut (33). At least two guide rods (34) are connected between the first ball nut (32) and the second ball nut (33). Each guide rod (34) is fitted with a spring (35). The upper and lower ends of the spring (35) abut against the second ball nut (33) and the first ball nut (32) respectively.

2. The focusing mechanism of a multi-objective microscope according to claim 1, characterized in that: The mounting bracket (1) has a fixing block (9) in the middle, the objective lens switching structure (6) is slidably disposed on the fixing block (9), and the deceleration structure (7) is fixed above the fixing block (9).

3. The focusing mechanism of a multi-objective microscope according to claim 2, characterized in that: The objective lens switching structure (6) includes a sliding seat (61) slidably disposed on a fixed block (9), a first ball nut (32) is mounted on the sliding seat (61), an inverted second motor (62) is mounted on the sliding seat (61), a drive pulley (63) is connected to the lower output shaft of the second motor (62), the drive pulley (63) is connected to a driven pulley (64) via a synchronous belt (65), the driven pulley (64) is connected to a connecting seat (66) fixed on a turntable (4), and the connecting seat (66) is rotatably connected to the sliding seat (61).

4. The focusing mechanism of a multi-objective microscope according to claim 3, characterized in that: The lower end of the lead screw (31) passes through the sliding seat (61), the connecting seat (66) and the turntable (4) and is connected to the guide tube (8). The guide tube (8) is vertically installed on the mounting bracket (1) and is movably connected to the turntable (4). The turntable (4) is provided with a clearance hole (41) at the position corresponding to the guide tube (8).

5. A focusing mechanism for a multi-objective microscope according to claim 4, characterized in that: The lead screw (31) is connected to a first bearing (36) at both the upper and lower ends. The two first bearings (36) are respectively connected to the fixed block (9) and the guide tube (8).

6. The focusing mechanism of a multi-objective microscope according to claim 3, characterized in that: A linear guide rail (10) is connected between the sliding seat (61) and the fixed block (9).

7. The focusing mechanism of a multi-objective microscope according to claim 1, characterized in that: The reduction structure (7) includes a sun gear (71) connected to the output shaft of the first motor (2) and a connecting rod (74) connected to the lead screw (31). The sun gear (71) is meshed with a plurality of planet gears (72) evenly spaced. A planet plate (73) is rotatably connected below the planet gears (72). The connecting rod (74) is installed below the planet plate (73). A gear cover (76) is provided on the outer side of the planet gears (72). A gear ring that meshes with the planet gears (72) is provided on the inner wall of the gear cover (76). A lower cover (77) is connected below the gear cover (76).

8. A focusing mechanism for a multi-objective microscope according to claim 7, characterized in that: The number of planetary gears (72) is three, and the three planetary gears (72) are arranged in an equilateral triangle around the sun gear (71). The central axis of the connecting rod (74) coincides with the central axis of the sun gear (71).

9. A focusing mechanism for a multi-objective microscope according to claim 7, characterized in that: A second bearing (75) is sleeved on the connecting rod (74), and the second bearing (75) is mounted on the gear cover (76). The speed ratio of the reduction structure (7) is 1:50.

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