Coarse and fine motion focusing structure and focusing device for electric Z axis of microscope

Abstract

The utility model relates to a coarse and fine motion focusing structure and focusing device of a microscope electric Z-axis, a base is cylindrical, a coarse hand wheel is rotatably sleeved on the base, a sensor plate is arranged between the base and the coarse hand wheel, and the sensor plate is fixedly connected with the base; a lower end protruding part of the main body of the middle connecting seat penetrates through the coarse hand wheel and is fixedly connected with the sensor plate; the micro-motion hand wheel is arranged above the main body of the middle connecting seat, the lower end of the micro-motion hand wheel is connected with a micro-motion shaft, and the tail end of the micro-motion shaft is arranged at the central through hole of the middle connecting seat; a first limiting ring table used for limiting the position of the micro-motion shaft is arranged in a center through hole of the middle connecting base. The coarse hand wheel is provided with a reflective optical encoder, the fine hand wheel is provided with a magnetic rotary encoder, and the reflective optical encoder and the magnetic rotary encoder are both arranged on the sensor plate. The system has the advantages of being simple in design, low in assembly difficulty and convenient to maintain, and the system cost can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of microscope Z-axis coarse and fine movement, in particular to a microscope electric Z-axis coarse and fine movement focusing structure and a focusing device. Background Art

[0002] Conventional motorized Z-axis focusing is achieved using a single encoded handwheel. This approach lacks fine-tuning of the Z-axis, making focusing difficult. While adding a speed control button or a non-coaxial fine-tuning handwheel can address this issue, it differs significantly from traditional manual Z-axis microscope operation, resulting in a poor user experience.

[0003] With the rapid development of medical and scientific research, the observation and analysis of the microscopic world, especially the high-definition image quality, high-speed focusing, and automatic intelligence, have put forward higher requirements. Therefore, the control method of the Z axis of the microscope has been continuously iterating, gradually developing from manual to electric.

[0004] For example, the Chinese utility model with publication number CN202093235U discloses a coaxial structure for coarse and fine focusing for adjusting a microscope platform, which can achieve the purpose of simple structure, not easy to wear, and long service life. However, this product has a complex structure, the operation methods of the manual Z-axis microscope vary greatly, and the operating experience is poor.

[0005] Therefore, the market urgently needs the microscope's electric Z-axis to be able to perform coaxial control of the coarse and fine handwheels and simplify the focusing structure. Utility Model Content

[0006] The purpose of the utility model is to provide a coarse and fine focusing structure and focusing device for an electric Z-axis of a microscope, which has the advantages of simple design, low assembly difficulty, and easy maintenance, and can effectively reduce system costs.

[0007] To achieve the above-mentioned purpose of the utility model, the utility model provides a coarse and fine focusing structure of an electric Z-axis of a microscope, comprising a coaxially arranged base, a coarse hand wheel, a fine hand wheel, and an intermediate connecting seat between the coarse hand wheel and the fine hand wheel;

[0008] The base is cylindrical, the coarse hand wheel is rotatably mounted on the base, a sensor plate is provided between the base and the coarse hand wheel, and the sensor plate is fixedly connected to the base;

[0009] The protruding portion at the lower end of the main body of the intermediate connecting seat passes through the coarse hand wheel and is fixedly connected to the sensor plate; the fine hand wheel is arranged above the main body of the intermediate connecting seat, the lower end of the fine hand wheel is connected to a fine movement shaft, and the end of the fine movement shaft is arranged at the central through hole of the intermediate connecting seat; a first limiting ring is arranged in the central through hole of the intermediate connecting seat for limiting the position of the fine movement shaft;

[0010] The coarse hand wheel is equipped with a reflective optical encoder, and the fine hand wheel is equipped with a magnetic rotary encoder. Both the reflective optical encoder and the magnetic rotary encoder are arranged on a sensor plate.

[0011] According to a technical solution of the present invention, the cross-section of the coarse hand wheel is "H"-shaped, and an encoding disk is provided on the lower surface of the horizontal part of the "H" shape. The reflective optical encoder is provided on the edge of the sensor plate, corresponding to the position of the encoding disk.

[0012] According to a technical solution of the present utility model, a supporting ring is provided on the main body of the intermediate connecting seat;

[0013] An upward second limiting ring is provided on the edge of the H-shaped horizontal portion of the coarse hand wheel, and the second limiting ring is adapted to the limiting groove on the lower surface of the supporting ring.

[0014] According to a technical solution of the present utility model, the end of the micro-motion shaft is a raised cone, and the magnet of the magnetic rotary encoder is embedded in the raised cone;

[0015] The magnetic rotary encoder is arranged at the center position of the sensor plate, corresponding to the position of the magnet.

[0016] According to a technical solution of the present utility model, a threaded section is provided on the micro-motion shaft, and a positioning nut is provided on the threaded section;

[0017] The positioning nut is provided with a threaded hole perpendicular to the fine-motion shaft, and a set screw is provided in the threaded hole.

[0018] According to a technical solution of the present utility model, a first bearing is provided between the raised circular platform and the first limiting ring platform;

[0019] A second bearing is provided between the positioning nut and the raised truncated cone;

[0020] The first bearing and the second bearing are thrust ball bearings.

[0021] According to a technical solution of the present utility model, the micro-motion hand wheel and the micro-motion shaft are fixed by screws;

[0022] The micro-hand wheel is equipped with an end cover, and the top of the micro-hand wheel is provided with an end cover groove adapted to the end cover.

[0023] According to a technical solution of the present invention, the main body of the micro-handle and the main body of the intermediate connecting seat are cylindrical, and a third limiting ring is provided at the lower end of the main body of the micro-handle;

[0024] The inner side surface of the main body of the micro hand wheel is adapted to the outer side surface of the main body of the intermediate connecting seat;

[0025] The third limiting ring platform has the same size as the supporting ring platform.

[0026] According to a technical solution of the present invention, the third limiting ring platform, the supporting ring platform and the inner side surface of the coarse hand wheel are adapted and assembled.

[0027] According to a technical solution of the present utility model, the base is provided with a supporting ring groove, and the inner side surface of the coarse hand wheel is adapted to the inner side surface of the supporting ring groove;

[0028] The outer side dimension of the coarse hand wheel is the same as the outer side dimension of the base.

[0029] According to one aspect of the present invention, a coarse and fine focusing device for an electric Z-axis of a microscope is provided, comprising:

[0030] A focusing structure as described in any one of the above technical solutions;

[0031] control systems;

[0032] Z-axis drive motor;

[0033] An MCU control circuit is used to receive the micro-handwheel signal of the reflective optical encoder and the coarse handwheel signal of the magnetic rotary encoder.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] According to a solution of the present invention, the coarse and fine focusing structure of the present invention is based on a basic focusing structure such as a coaxially arranged base, a coarse hand wheel, a fine hand wheel and an intermediate connecting seat. By installing a reflective optical encoder and a magnetic rotary encoder on the sensor board, on the basis of realizing the coaxial rotation of the coarse hand wheel and the fine hand wheel, the reflective optical encoder and the magnetic rotary encoder are used to complete the signal acquisition of the coaxial coarse and fine hand wheels. It has the advantages of simple design, low assembly difficulty and easy maintenance, and can effectively reduce the system cost.

[0036] Furthermore, the coarse and fine focusing structure of the present invention does not need to be designed as a symmetrical structure, occupies little space, and is conducive to achieving a small size.

[0037] According to one solution of the utility model, the coarse and fine focusing device of the electric Z-axis of a microscope of the present invention has the characteristics of simple structure and high control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A cross-sectional view schematically illustrates a coarse and fine focusing structure of a microscope motorized Z-axis according to an embodiment of the present invention;

[0039] Figure 2 Schematically shows a circuit diagram of a coarse hand wheel and a fine hand wheel according to an embodiment of the present utility model;

[0040] Figure 3 A schematic diagram schematically illustrates the composition of a microscope electric Z-axis coarse and fine focusing device according to one embodiment of the present invention;

[0041] Figure 4 A cross-sectional view schematically shows a coarse and fine focusing structure of a microscope electric Z-axis according to another embodiment of the present invention.

[0042] Reference numerals:

[0043] 1. Base; 2. Coarse handwheel; 3. Fine handwheel; 4. Intermediate connecting seat; 5. Sensor plate; 6. Fine axis; 7. Encoder disk; 8. Magnet; 9. Positioning nut; 10. Set screw; 11. First bearing; 12. Second bearing; 13. End cover;

[0044] 101, supporting ring groove; 201, second limiting ring platform; 401, first limiting ring platform; 402, supporting ring platform; 301, third limiting ring platform; 601, raised circular platform. DETAILED DESCRIPTION

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0046] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms cannot be understood as limiting the present invention.

[0047] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not limited to the following embodiments.

[0048] like Figure 1 、 Figure 2 and Figure 4 As shown, according to one embodiment of the present invention, a coarse and fine focusing structure of an electric Z-axis of a microscope of the present invention includes a coaxially arranged base 1, a coarse hand wheel 2, a fine hand wheel 3 and an intermediate connecting seat 4 between the coarse hand wheel 2 and the fine hand wheel 3.

[0049] Among them, the coarse hand wheel 2 and the fine hand wheel 3 are rotatable, the base 1 is used to support the entire focusing structure and is also used to connect to the microscope. The base 1 and the intermediate connecting seat 4 serve as the main frame of the focusing structure.

[0050] The base 1 is cylindrical, and the coarse hand wheel 2 is rotatably mounted on the base 1. A sensor plate 5 is provided between the base 1 and the coarse hand wheel 2. The sensor plate 5 is used to fix the sensors corresponding to the two hand wheels. The sensor plate 5 is fixedly connected to the base 1 to ensure stability.

[0051] The protruding portion at the lower end of the main body of the intermediate connecting seat 4 passes through the coarse hand wheel 2 and is fixedly connected to the sensor plate 5, so that the intermediate connecting seat 4, the sensor plate 5 and the base 1 are fixed as a whole. At the same time, the protruding portion at the lower end of the main body of the intermediate connecting seat 4 can provide support for the coarse hand wheel 2 to ensure the stability of the rotation of the coarse hand wheel 2. Specifically, the intermediate connecting seat 4 can be first set on the sensor plate 5, and the sensor plate 5 and the intermediate connecting seat 4 can be connected from bottom to top through the cross-slot pan head screw. Then, the sensor plate 5 can be set on the base 1, and the sensor plate 5 and the base 1 can be connected through the cross-slot pan head screw from top to bottom.

[0052] The fine-motion handwheel 3 is arranged above the main body of the intermediate connecting seat 4, and the lower end of the fine-motion handwheel 3 is connected to the fine-motion shaft 6, and the end of the fine-motion shaft 6 is arranged at the central through hole of the intermediate connecting seat 4; a first limiting ring 401 for limiting the position of the fine-motion shaft 6 is provided in the central through hole of the intermediate connecting seat 4; during assembly, the fine-motion shaft 6 is passed through the central through hole of the intermediate connecting seat 4 from the bottom, and then the fine-motion handwheel 3 is fixedly connected to the fine-motion shaft 6.

[0053] Among them, the encoder corresponding to the coarse handwheel 2 can adopt the AEDR-8300P reflective optical encoder, which is composed of a light-emitting diode, a detector and a lens. A code disk 7 is attached to the inner side of the coarse handwheel 2. When the coarse handwheel 2 rotates, the code disk 7 reflects light to generate a signal. After program processing, the rotation direction and angle of the coarse handwheel 2 can be obtained. The encoder corresponding to the fine handwheel 3 adopts the AS5047P magnetic encoder. A magnet 8 is configured on the fine shaft 6. When the fine handwheel 3 rotates, a signal is generated due to magnetic changes. After program processing, the rotation direction and angle of the fine handwheel 3 can be obtained.

[0054] Compared with the screw structure in the prior art, the coarse and fine focusing structure of the present invention is based on a basic focusing structure including a coaxially arranged base 1, a coarse handwheel 2, a fine handwheel 3 and an intermediate connecting seat 4. By installing a reflective optical encoder and a magnetic rotary encoder on the sensor plate 5, while realizing the coaxial rotation of the coarse handwheel 2 and the fine handwheel 3, the reflective optical encoder and the magnetic rotary encoder are used to complete the signal acquisition of the coaxial coarse and fine handwheels. It has the advantages of simple design, low assembly difficulty and easy maintenance, and can effectively reduce the system cost.

[0055] Furthermore, the coarse and fine focusing structure of the present invention does not need to be designed as a symmetrical structure, occupies little space, and is conducive to achieving a small size.

[0056] Based on the coarse and fine focusing structure of the present invention, the maximum diameter can reach less than φ42mm, usually 30-45mm, and the minimum diameter can reach less than φ26mm, usually 20-30mm; the axial size can reach 41mm, usually 35-45mm.

[0057] In some embodiments of the present invention, the cross-section of the coarse hand wheel 2 is "H"-shaped, and a coding disk 7 is provided on the lower surface of the horizontal part of the "H", and the reflective optical encoder is provided on the edge of the sensor plate 5, corresponding to the position of the coding disk 7.

[0058] In some embodiments of the present invention, a supporting ring 402 is provided on the main body of the intermediate connecting seat 4, and the supporting ring 402 is used to support the micro-hand wheel 3;

[0059] The edge of the "H"-shaped horizontal part of the coarse hand wheel 2 is provided with an upward second limiting ring 201, and the second limiting ring 201 is adapted to the limiting groove on the lower surface of the support ring 402. After the second limiting ring 201 and the limiting groove are assembled, they can limit the axial position of the intermediate connecting seat 4, and the "H"-shaped horizontal part of the coarse hand wheel 2 can support the support ring 402, reduce the pressure of the intermediate connecting seat 4 on the sensor plate 5 below, and ensure the normal use of the sensor plate 5.

[0060] The coarse hand wheel 2 with an H-shaped cross section may have the same or different sizes of its upper half (the upper half of the H) and lower half, which may be specifically set based on the characteristics of the assembly structure.

[0061] In some embodiments of the present invention, the end of the fine-motion shaft 6 is a raised truncated cone 601 , and the magnet 8 of the magnetic rotary encoder is embedded in the raised truncated cone 601 ;

[0062] The magnetic rotary encoder is arranged at the center of the sensor plate 5 , corresponding to the position of the magnet 8 .

[0063] By fixing a magnet 8 at the center position of the end of the fine-motion shaft 6, the magnet 8 is suspended directly above the encoder. When the fine-motion handwheel 3 is rotated, the fine-motion handwheel 3 and the fine-motion shaft 6 are fixed so that both rotate at the same time. At this time, the encoder generates an electrical signal due to the magnetic change caused by the rotation of the magnet 8 directly above. After processing, the electrical signal can be used to obtain the direction and angle of rotation of the fine-motion handwheel 3.

[0064] In some embodiments of the present utility model, a threaded section is provided on the micro-motion shaft 6, and a positioning nut 9 is provided on the threaded section;

[0065] The positioning nut 9 is provided with a threaded hole perpendicular to the fine-motion shaft 6 , and a set screw 10 is provided in the threaded hole.

[0066] In some embodiments of the present invention, a first bearing 11 is provided between the raised circular platform 601 and the first limiting ring platform 401;

[0067] A second bearing 12 is provided between the positioning nut 9 and the raised truncated cone 601;

[0068] The first bearing 11 and the second bearing 12 are thrust ball bearings.

[0069] The positioning nut 9 rotates on the threaded section of the fine-motion shaft 6 to achieve up and down movement. The positioning nut 9 is then fixed to the fine-motion shaft 6 at a fixed position using a set screw 10. The dual action of the threads and the set screw 10 secures the positioning nut 9, preventing movement. A first bearing 11 and a second bearing 12 are disposed between the positioning nut 9 and the raised truncated platform 601. The positioning nut 9 and the raised truncated platform 601 define the positions of the two bearings. The first limiting ring 401, the first bearing 11, and the raised truncated platform 601 simultaneously limit the position of the fine-motion shaft 6.

[0070] During assembly, first sleeve the first bearing 11 on the fine-motion shaft 6, then pass the fine-motion shaft 6 through the intermediate connecting seat 4, and then fix the intermediate connecting seat 4, the sensor plate 5 and the base 1. At this time, sleeve the second bearing 12 on the fine-motion shaft 6, and use the positioning nut 9 and the set screw 10 to complete the limitation of the second bearing 12.

[0071] In some embodiments of the present invention, the micro-handle 3 and the micro-axis 6 are fixed by screws, and the screws can be hexagon socket head screws;

[0072] The micro-hand wheel 3 is provided with an end cover 13 , and the top of the micro-hand wheel 3 is provided with an end cover groove adapted to the end cover 13 .

[0073] The micro-handle 3 is provided with an end cover groove, and a slot hole is provided at the center of the end cover groove. The screw is connected to the micro-motion shaft 6 after passing through the slot. The slot size is not smaller than the size of the screw head. The end cover groove is covered with the end cover 13 to prevent the screw from directly contacting the outside world and causing accidental loosening. It also has dust-proof and aesthetic functions.

[0074] In some embodiments of the present invention, the main body of the micro-handle 3 and the main body of the intermediate connecting seat 4 are cylindrical, and the lower end of the main body of the micro-handle 3 is provided with a third limiting ring 301;

[0075] The inner side surface of the main body of the micro hand wheel 3 is adapted to the outer side surface of the main body of the intermediate connecting seat 4;

[0076] The third limiting ring platform 301 and the supporting ring platform 402 have the same size.

[0077] In some embodiments of the present invention, the third limiting ring 301 and the supporting ring 402 are adapted and assembled with the inner side surface of the coarse hand wheel 2 .

[0078] When the main body of the fine handwheel 3 is assembled with the intermediate connecting seat 4, the third limiting ring platform 301 arranged at the lower end of the main body of the fine handwheel 3 rests on the supporting ring platform 402 of the intermediate connecting seat 4. The outer circumference size of the third limiting ring platform 301 and the support ring platform 402 is the same. After the third limiting ring platform 301, the support ring platform 402 and the inner surface of the coarse handwheel 2 are adapted and assembled, the third limiting ring platform 301 can prevent dust, water and other substances from entering the interior of the focusing structure.

[0079] In some embodiments of the present invention, the base 1 is provided with a supporting ring groove 101 , and the inner side surface of the coarse hand wheel 2 is adapted to the inner side surface of the supporting ring groove 101 ;

[0080] The outer side dimension of the coarse hand wheel 2 is the same as that of the outer side dimension of the base 1 .

[0081] like Figure 3 As shown, according to one aspect of the present invention, a coarse and fine focusing device for an electric Z-axis of a microscope is proposed, comprising:

[0082] The focusing structure of any one of the above technical solutions;

[0083] control systems;

[0084] Z-axis drive motor;

[0085] An MCU control circuit is used to receive signals from the fine handwheel 3 of the reflective optical encoder and the coarse handwheel 2 of the magnetic rotary encoder. The MCU control circuit is electrically connected to the sensor board 5 .

[0086] The MCU control circuit receives the coarse handwheel 2 signal and the fine handwheel 3 signal through four input ports. After the signals are processed by the program, the rotation direction and angle of the two handwheels are obtained, and the obtained data is uploaded to the control system (computer). The control system controls the microscope Z-axis drive motor controller according to the data, thereby driving the Z-axis motor to rotate, thereby adjusting the height of the Z-axis.

[0087] The above content is only an example of a specific solution of the present invention. For the equipment and structures not described in detail, it should be understood that they can be implemented by adopting the general equipment and general methods available in the field.

[0088] The above description is only one embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A microscope electric Z-axis coarse and fine focusing structure, characterized in that: It comprises a coaxially arranged base (1), a coarse hand wheel (2), a fine hand wheel (3), and an intermediate connecting seat (4) between the coarse hand wheel (2) and the fine hand wheel (3); The base (1) is cylindrical, the coarse hand wheel (2) is rotatably sleeved on the base (1), a sensor plate (5) is provided between the base (1) and the coarse hand wheel (2), and the sensor plate (5) is fixedly connected to the base (1); The protruding portion at the lower end of the main body of the intermediate connecting seat (4) passes through the coarse hand wheel (2) and is fixedly connected to the sensor plate (5); the fine hand wheel (3) is arranged above the main body of the intermediate connecting seat (4); the lower end of the fine hand wheel (3) is connected to a fine motion shaft (6), and the end of the fine motion shaft (6) is arranged at the central through hole of the intermediate connecting seat (4); a first limiting ring (401) for limiting the position of the fine motion shaft (6) is arranged in the central through hole of the intermediate connecting seat (4); The coarse hand wheel (2) is equipped with a reflective optical encoder, and the fine hand wheel (3) is equipped with a magnetic rotary encoder. Both the reflective optical encoder and the magnetic rotary encoder are arranged on a sensor plate (5).

2. The microscope electric Z-axis coarse and fine focusing structure according to claim 1, characterized in that: The cross section of the coarse hand wheel (2) is in an "H" shape, and a coding disk (7) is provided on the lower surface of the horizontal portion of the "H" shape. The reflective optical encoder is provided on the edge of the sensor plate (5) and corresponds to the position of the coding disk (7).

3. The microscope electric Z-axis coarse and fine focusing structure according to claim 2, characterized in that: A supporting ring platform (402) is provided on the main body of the intermediate connecting seat (4); An edge of the H-shaped horizontal portion of the coarse hand wheel (2) is provided with an upward second limiting ring platform (201), and the second limiting ring platform (201) is adapted to the limiting groove on the lower surface of the supporting ring platform (402).

4. The microscope electric Z-axis coarse and fine focusing structure according to claim 1, characterized in that: The end of the micro-motion shaft (6) is a raised truncated cone (601), and the magnet (8) of the magnetic rotary encoder is embedded in the raised truncated cone (601); The magnetic rotary encoder is arranged at the center position of the sensor plate (5), corresponding to the position of the magnet (8).

5. The microscope electric Z-axis coarse and fine focusing structure according to claim 4, characterized in that: The fine-motion shaft (6) is provided with a threaded section, and the threaded section is provided with a positioning nut (9); The positioning nut (9) is provided with a threaded hole perpendicular to the micro-motion shaft (6), and a set screw (10) is provided in the threaded hole.

6. The microscope electric Z-axis coarse and fine focusing structure according to claim 5, characterized in that: A first bearing (11) is provided between the raised circular platform (601) and the first limiting ring platform (401); A second bearing (12) is provided between the positioning nut (9) and the raised truncated cone (601); The first bearing (11) and the second bearing (12) are thrust ball bearings.

7. The microscope electric Z-axis coarse and fine focusing structure according to claim 1, characterized in that: The micro-motion hand wheel (3) and the micro-motion shaft (6) are fixed by screws; The micro-hand wheel (3) is provided with an end cover (13), and the top of the micro-hand wheel (3) is provided with an end cover groove adapted to the end cover (13).

8. The microscope electric Z-axis coarse and fine focusing structure according to claim 3, characterized in that: The main body of the micro-handle (3) and the main body of the intermediate connecting seat (4) are cylindrical, and a third limiting ring platform (301) is provided at the lower end of the main body of the micro-handle (3); The inner side surface of the main body of the micro hand wheel (3) is adapted to the outer side surface of the main body of the intermediate connecting seat (4); The third limiting ring platform (301) and the supporting ring platform (402) have the same size.

9. The microscope electric Z-axis coarse and fine focusing structure according to claim 8, characterized in that: The third limiting ring platform (301), the supporting ring platform (402) and the inner side surface of the coarse hand wheel (2) are adapted and assembled.

10. The microscope electric Z-axis coarse and fine focusing structure according to claim 1, characterized in that: The base (1) is provided with a supporting ring groove (101), and the inner side surface of the coarse hand wheel (2) is adapted to the inner side surface of the supporting ring groove (101); The outer side dimensions of the coarse hand wheel (2) are the same as the outer side dimensions of the base (1).

11. A microscope electric Z-axis coarse and fine focusing device, characterized in that: include: The focusing structure according to any one of claims 1 to 10; control systems; Z-axis drive motor; An MCU control circuit is provided for receiving a signal from a micro handwheel (3) of the reflective optical encoder and a signal from a coarse handwheel (2) of the magnetic rotary encoder.

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