High-precision high-stability focusing mechanism

Abstract

A high-precision and high-stability focusing mechanism disclosed by the present invention comprises a focusing transmission assembly, a focusing support assembly, a focusing carriage assembly and four slide rails, the focusing transmission assembly is mounted on the upper wall of the focusing support assembly, the focusing carriage assembly is arranged on the inner side of the focusing support assembly, and the four slide rails are mounted on the upper wall of the focusing support assembly. The four sliding rails are all arranged between the focusing sliding frame assembly and the focusing supporting assembly, the fixed ends of the four sliding rails are all installed on the side wall of the focusing supporting assembly, the sliding ends of the four sliding rails are all installed on the side wall of the focusing sliding frame assembly, and the focusing sliding frame assembly can slide on the inner side of the focusing supporting assembly through the sliding rails. According to the device, the focusing transmission assembly drives the focusing carriage assembly to move, the focusing carriage assembly drives the focal plane of an external camera to move, so that the purpose of focusing the camera is achieved, and meanwhile, the device adopts the design of four sliding rails, so that the adjusting carriage assembly is more stable in sliding.

Description

Technical Field

[0001] The invention relates to the technical field of camera focusing, in particular to a high-precision and high-stability focusing mechanism. Background Art

[0002] Camera focusing refers to adjusting the focal length of the lens to change the clarity and viewing angle of the captured image. Focusing is achieved by changing the distance between the optical center of the lens and the photosensitive element. This process directly affects the clarity and viewing angle of the image. The longer the focal length, the narrower the viewing angle, and the closer the image looks; the shorter the focal length, the wider the viewing angle, and the more things can fit in the image. However, similar products on the market generally have problems such as unstable focusing and insufficient precision, so a high-precision and high-stability focusing mechanism is needed. Summary of the invention

[0003] The object of the present invention is to provide a high-precision and high-stability focusing mechanism to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-precision and high-stability focusing mechanism, comprising a focusing transmission assembly, a focusing support assembly, a focusing slide assembly and a slide rail, wherein the upper wall of the focusing support assembly is provided with a focusing transmission assembly, the inner side of the focusing support assembly is provided with a focusing slide assembly, and a total of four slide rails are provided, and the four slide rails are all provided between the focusing slide assembly and the focusing support assembly, the fixed ends of the four slide rails are all installed on the side wall of the focusing support assembly, and the sliding ends of the four slide rails are all installed on the side wall of the focusing slide assembly, and the focusing slide assembly can slide on the inner side of the focusing support assembly through the slide rail; A camera mounting hole is provided on the side wall of the focusing support assembly, and the focusing support assembly is connected to the external camera body through the camera mounting hole. A focal plane mounting hole is provided on the side wall of the focusing slide assembly, and the focusing slide assembly is connected to the focal plane of the external camera through the focal plane mounting hole.

[0005] Preferably, the focusing transmission assembly includes a worm box, a worm, a motor bracket and a motor. The worm box is installed at the center position above the focusing support assembly, the inner wall of the worm box is rotatably mounted with a worm, the side wall of the worm box is mounted with a motor bracket, the upper wall of the motor bracket is mounted with a motor, the motor is electrically connected to an external power supply, and the output end of the motor passes through the side wall of the worm box and is connected to the worm.

[0006] Preferably, the focusing support assembly includes a focusing support frame, a clearance groove, a lead screw, a worm wheel and a lead screw nut. The worm box is installed at the center position above the focusing support frame. The upper wall of the focusing support frame is provided with a clearance groove, and the clearance groove is arranged below the worm box. A lead screw is rotatably installed in the clearance groove, and a worm wheel is installed on the outer side wall of the lead screw. The worm wheel is meshingly connected with the worm, and a lead screw nut is installed on the outer side of the lead screw. The lead screw nut can slide on the lead screw, and the lead screw nut is connected to the upper wall of the focusing slide assembly by bolts, and the camera mounting hole is opened on the side wall of the focusing support frame.

[0007] Preferably, the focusing slide assembly includes a slide body, a focal plane mounting hole and a through groove, the slide body is slidably mounted on the side wall of the focusing support frame through a slide rail, the side wall of the slide body is provided with a focal plane mounting hole, the focal plane of the external camera is mounted on the side wall of the slide body through the focal plane mounting hole, and the side wall of the slide body is provided with a through groove, and the through groove corresponds to the position of the focal plane of the external camera.

[0008] Preferably, a grating scale probe assembly is installed on the upper wall of the focusing support frame, and the grating scale probe assembly includes a grating scale bracket, a grating scale and a reading head. The grating scale bracket is inserted and installed on the upper wall of the focusing support frame, and the upper wall of the grating scale bracket is installed with a grating scale. The detection end of the grating scale is arranged above the slide body, and a reading head is installed above the grating scale, and the reading head is electrically connected to the grating scale.

[0009] Preferably, a Hall element is installed on the inner side wall of the focusing support frame, and a magnet is installed on the upper wall of the slide body, and the position of the magnet corresponds to that of the Hall element.

[0010] Preferably, a limiting groove is provided on the upper wall of the focusing support frame, and two limiting grooves are provided in total. The two limiting grooves are respectively arranged on the left and right sides of the giving way groove. A positioning pin is installed on the upper wall of the slide body, and two positioning pins are provided in total. The two positioning pins can be inserted into the two limiting grooves respectively, and the positioning pins can slide in the limiting grooves.

[0011] Preferably, the positioning pin includes a pin body, an annular groove and a wear-resistant sleeve. The pin body is installed on the upper wall of the slide body. The outer wall of the pin body is provided with an annular groove. A wear-resistant sleeve is rotatably installed in the annular groove. The wear-resistant sleeve can fit with the inner wall of the limiting groove.

[0012] Preferably, a limiting rod is installed on the upper wall of the slide body, and two limiting rods are provided in total. The two limiting rods can be inserted into the two limiting grooves respectively, and the limiting rods can slide in the limiting grooves.

[0013] Preferably, the limiting rod includes a main rod body, a groove, a connecting hole, a secondary rod body and a convex rod, the main rod body is installed on the upper wall of the slide body, the left and right side walls of the main rod body are provided with grooves, the upper and lower side walls of the two grooves are provided with connecting holes, and the upper and lower ends of the secondary rod body are installed with convex rods, and the convex rods can be inserted and installed in the connecting holes.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The device drives the focus slide assembly to move through the focus transmission assembly, and drives the focal plane of the external camera to move through the focus slide assembly, so as to achieve the purpose of focusing the camera. At the same time, the device adopts a design of four slide rails to make the price adjustment slide assembly more stable during sliding; In addition, the device is also equipped with a grating scale probe assembly and a Hall element on the focusing support frame, and the sliding of its focusing slide assembly is controlled by a motor, so that it can accurately control the sliding distance of the slide body and improve the focusing accuracy of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention.

[0016] Figure 2 It is a side view structural schematic diagram of the present invention.

[0017] Figure 3 It is a schematic diagram of the top structure of the present invention.

[0018] Figure 4 This is a bottom view of the focusing support frame of the present invention.

[0019] Figure 5 It is a schematic diagram of the positioning pin structure of the present invention.

[0020] Figure 6 It is a schematic diagram of the limit rod structure of the present invention.

[0021] In the figure: 1 focusing transmission assembly, 2 focusing support assembly, 3 focusing slide assembly, 4 slide rail, 5 camera mounting hole, 6 focal plane mounting hole, 7 grating scale probe assembly, 8 Hall element, 9 magnetic steel, 10 limit groove, 11 worm box, 12 worm, 13 motor bracket, 14 motor, 15 positioning pin, 16 limit rod, 21 focusing support frame, 22 give way groove, 23 screw, 24 worm wheel, 25 screw nut, 31 slide body, 32 focal plane mounting hole, 33 through groove, 71 grating scale bracket, 72 grating scale, 73 reading head, 151 pin body, 152 annular slide groove, 153 wear-resistant sleeve, 161 main rod body, 162 groove, 163 connecting hole, 164 auxiliary rod body, 165 convex rod. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1-5 The present invention provides a first technical solution: a high-precision and high-stability focusing mechanism, comprising a focusing transmission assembly 1, a focusing support assembly 2, a focusing slide assembly 3 and a slide rail 4, the upper wall of the focusing support assembly 2 is installed with the focusing transmission assembly 1, the inner side of the focusing support assembly 2 is provided with the focusing slide assembly 3, and there are four slide rails 4 in total, and the four slide rails 4 are all arranged between the focusing slide assembly 3 and the focusing support assembly 2, the fixed ends of the four slide rails 4 are all installed on the side wall of the focusing support assembly 2, and the sliding ends of the four slide rails 4 are all installed on the side wall of the focusing slide assembly 3, and the focusing slide assembly 3 can slide on the inner side of the focusing support assembly 2 through the slide rails 4; In the present device, four sets of slide rails 4 are used, two sets of slide rails 4 are respectively arranged on the left and right sides of the focusing slide assembly 3, and the other two sets are arranged above the focusing slide assembly 3, so as to improve the stability and accuracy of the focusing slide assembly 3 during the sliding process, and avoid the shaking of the focusing slide assembly 3 during the sliding process; A camera mounting hole 5 is provided on the side wall of the focus support assembly 2, and the focus support assembly 2 is connected to the external camera body through the camera mounting hole 5. A focal plane mounting hole 6 is provided on the side wall of the focus slide assembly 3, and the focus slide assembly 3 is connected to the focal plane of the external camera through the focal plane mounting hole 6. After the device is installed on an external camera through the camera mounting hole 5 and the focal plane mounting hole 6, when the camera needs to be focused, the motor 14 in the focusing transmission assembly 1 can be controlled to drive the worm 12 to rotate, and then the worm 12 and the worm wheel 24 can cooperate to drive the lead screw 23 to rotate, and then the lead screw nut 24 on the lead screw 23 can be driven to slide through the lead screw 23, and then the sliding frame body 31 and the focal plane of the camera above can be driven to slide through the lead screw nut 24 to complete the focusing of the camera.

[0024] Specifically, the focusing transmission assembly 1 includes a worm box 11, a worm 12, a motor bracket 13 and a motor 14. The worm box 11 is installed at the center position above the focusing support assembly 2. The worm 12 is rotatably installed on the inner side wall of the worm box 11. The motor bracket 13 is installed on the side wall of the worm box 11. The motor 14 is installed on the upper wall of the motor bracket 13. The motor 14 is electrically connected to an external power supply, and the output end of the motor 14 passes through the side wall of the worm box 11 and is connected to the worm 12. The motor 14 in this article can drive the worm 12 to rotate, and then the worm 12 cooperates with the worm wheel 24 outside the lead screw 23 to drive the lead screw nut 25 and the focusing slide assembly 3 to move, thereby achieving precise control of the sliding distance.

[0025] Specifically, the focus support assembly 2 includes a focus support frame 21, a clearance groove 22, a lead screw 23, a worm gear 24 and a lead screw nut 25. The worm box 11 is installed at the center position above the focus support frame 21. The upper wall of the focus support frame 21 is provided with a clearance groove 22, and the clearance groove 22 is arranged below the worm box 11. A lead screw 23 is rotatably installed in the clearance groove 22. A worm gear 24 is installed on the outer side wall of the lead screw 23. The worm gear 24 is meshed and connected with the worm 12. A lead screw nut 25 is installed on the outer side of the lead screw 23. The lead screw nut 25 can slide on the lead screw 23. The lead screw nut 25 is connected to the upper wall of the focusing slide assembly 3 by bolts. The camera mounting hole 5 is opened on the side wall of the focus support frame 21. Driven by the lead screw nut 25, the slide body 31 can slide back and forth inside the focusing support frame 21 to adjust the distance between the camera and the focal plane, thereby achieving the purpose of focusing. At the same time, because the device also has a slide rail 4 on the outside of the slide body 31, the slide body 31 is more stable when sliding to avoid shaking.

[0026] Specifically, the focusing slide assembly 3 includes a slide body 31, a focal plane mounting hole 32 and a through groove 33. The slide body 31 is slidably mounted on the side wall of the focusing support frame 21 through the slide rail 4. The side wall of the slide body 31 is provided with a focal plane mounting hole 32. The focal plane of the external camera is mounted on the side wall of the slide body 31 through the focal plane mounting hole 32. The side wall of the slide body 31 is provided with a through groove 33. The through groove 33 corresponds to the position of the focal plane of the external camera. The focal plane of the camera is mounted on the carriage body 31 by means of fasteners such as bolts. When the carriage body 31 slides, the focal plane of the camera can be driven to move, thereby adjusting the focal length.

[0027] Specifically, a grating scale probe assembly 7 is installed on the upper wall of the focusing support frame 21. The grating scale probe assembly 7 includes a grating scale bracket 71, a grating scale 72 and a reading head 73. The grating scale bracket 71 is inserted and installed on the upper wall of the focusing support frame 21. The grating scale 72 is installed on the upper wall of the grating scale bracket 71. The detection end of the grating scale 72 is arranged above the carriage body 31. The reading head 73 is installed above the grating scale 72. The reading head 73 is electrically connected to the grating scale 72. The grating ruler 72 can monitor the moving distance of the carriage body 31 in real time, and the reading head 73 above it can display the reading measured by the grating ruler 72 in real time.

[0028] Specifically, a Hall element 8 is installed on the inner wall of the focus support frame 21, and a magnetic steel 9 is installed on the upper wall of the slide body 31, and the position of the magnetic steel 9 corresponds to that of the Hall element 8; The Hall element 8 in this article is a Hall sensor, which monitors the position of the magnetic steel 9 in the device and limits the extreme positions of the two ends of the slide body 31 when it slides, so as to avoid excessive sliding of the slide body 31.

[0029] Specifically, the upper wall of the focus support frame 21 is provided with a limit groove 10, and there are two limit grooves 10, which are respectively arranged on the left and right sides of the yield groove 22, and the upper wall of the slide body 31 is provided with a positioning pin 15, and there are two positioning pins 15, which can be inserted into the two limit grooves 10 respectively, and the positioning pin 15 can slide in the limit groove 10; The positioning pin 15 can cooperate with the Hall element 8 to limit the sliding distance of the slide body 31 and prevent the slide body 31 from sliding excessively.

[0030] Specifically, the positioning pin 15 includes a pin body 151, an annular groove 152 and a wear-resistant sleeve 153. The pin body 151 is installed on the upper wall of the slide body 31. The outer wall of the pin body 151 is provided with an annular groove 152. The wear-resistant sleeve 153 is rotatably installed in the annular groove 152. The wear-resistant sleeve 153 can fit the inner wall of the limiting groove 10. Because the positioning pin 15 will generate friction with the limiting groove 10 during the sliding process, in order to avoid excessive wear of the positioning pin 15, which will cause a change in the sliding distance of the slide body 31, a wear-resistant sleeve 153 is provided on the outer side of the pin body 151. The wear-resistant sleeve 153 contacts the limiting groove 10 to improve the wear resistance of the positioning pin 15.

[0031] Working principle: After the device is installed on an external camera through the camera mounting hole 5 and the focal plane mounting hole 6, when the camera needs to be focused, the motor 14 in the focusing transmission assembly 1 can be controlled to drive the worm 12 to rotate, and then the worm 12 and the worm wheel 24 cooperate to drive the lead screw 23 to rotate, and then the lead screw nut 24 on the lead screw 23 is driven to slide through the lead screw 23, and then the sliding frame body 31 and the focal plane of the camera above are driven to slide through the lead screw nut 24 to complete the focusing of the camera.

[0032] See also Figure 1 , 2, 3, 6, the present invention provides a first technical solution: a high-precision and high-stability focusing mechanism, comprising a focusing transmission assembly 1, a focusing support assembly 2, a focusing slide assembly 3 and a slide rail 4, the upper wall of the focusing support assembly 2 is installed with the focusing transmission assembly 1, the inner side of the focusing support assembly 2 is provided with the focusing slide assembly 3, and there are four slide rails 4 in total, the four slide rails 4 are all arranged between the focusing slide assembly 3 and the focusing support assembly 2, the fixed ends of the four slide rails 4 are all installed on the side wall of the focusing support assembly 2, the sliding ends of the four slide rails 4 are all installed on the side wall of the focusing slide assembly 3, and the focusing slide assembly 3 can slide on the inner side of the focusing support assembly 2 through the slide rails 4; A camera mounting hole 5 is provided on the side wall of the focusing support assembly 2, and the focusing support assembly 2 is connected to the external camera body through the camera mounting hole 5. A focal plane mounting hole 6 is provided on the side wall of the focusing slide assembly 3, and the focusing slide assembly 3 is connected to the focal plane of the external camera through the focal plane mounting hole 6.

[0033] Specifically, the focusing transmission assembly 1 includes a worm box 11, a worm 12, a motor bracket 13 and a motor 14. The worm box 11 is installed at the center position above the focusing support assembly 2. The worm 12 is rotatably installed on the inner wall of the worm box 11, the motor bracket 13 is installed on the side wall of the worm box 11, and the motor 14 is installed on the upper wall of the motor bracket 13. The motor 14 is electrically connected to an external power supply, and the output end of the motor 14 passes through the side wall of the worm box 11 and is connected to the worm 12.

[0034] Specifically, the focusing support assembly 2 includes a focusing support frame 21, a clearance groove 22, a lead screw 23, a worm wheel 24 and a lead screw nut 25. The worm box 11 is installed at the center position above the focusing support frame 21. The upper wall of the focusing support frame 21 is provided with a clearance groove 22, and the clearance groove 22 is arranged below the worm box 11. A lead screw 23 is rotatably installed in the clearance groove 22. A worm wheel 24 is installed on the outer wall of the lead screw 23. The worm wheel 24 is meshed with the worm 12. A lead screw nut 25 is installed on the outer side of the lead screw 23. The lead screw nut 25 can slide on the lead screw 23. The lead screw nut 25 is connected to the upper wall of the focusing slide assembly 3 by bolts, and the camera mounting hole 5 is opened on the side wall of the focusing support frame 21.

[0035] Specifically, the focusing slide assembly 3 includes a slide body 31, a focal plane mounting hole 32 and a through groove 33. The slide body 31 is slidably mounted on the side wall of the focusing support frame 21 through the slide rail 4. The side wall of the slide body 31 is provided with a focal plane mounting hole 32. The focal plane of the external camera is mounted on the side wall of the slide body 31 through the focal plane mounting hole 32. The side wall of the slide body 31 is provided with a through groove 33, and the through groove 33 corresponds to the position of the focal plane of the external camera.

[0036] Specifically, a grating scale probe assembly 7 is installed on the upper wall of the focusing support frame 21. The grating scale probe assembly 7 includes a grating scale bracket 71, a grating scale 72 and a reading head 73. The grating scale bracket 71 is inserted and installed on the upper wall of the focusing support frame 21. The grating scale 72 is installed on the upper wall of the grating scale bracket 71. The detection end of the grating scale 72 is arranged above the slide body 31. A reading head 73 is installed above the grating scale 72. The reading head 73 is electrically connected to the grating scale 72.

[0037] Specifically, a Hall element 8 is installed on the inner wall of the focus support frame 21 , and a magnet 9 is installed on the upper wall of the slide body 31 . The position of the magnet 9 corresponds to that of the Hall element 8 .

[0038] Specifically, a limiting rod 16 is installed on the upper wall of the slide body 31 . There are two limiting rods 16 in total. The two limiting rods 16 can be inserted into the two limiting grooves 10 respectively, and the limiting rods 16 can slide in the limiting grooves 10 .

[0039] Specifically, the limiting rod 16 includes a main rod body 161, a groove 162, a connecting hole 163, a secondary rod body 164 and a protruding rod 165. The main rod body 161 is installed on the upper wall of the carriage body 31. The left and right side walls of the main rod body 161 are provided with grooves 162. The upper and lower side walls of the two grooves 162 are provided with connecting holes 163. The upper and lower ends of the secondary rod body 164 are provided with protruding rods 165, which can be inserted and installed in the connecting holes 163. By setting grooves 162 on both sides of the main rod body 161 and setting a rotatable sub-rod body 164 in the groove 162, the sub-rod body 164 makes contact with the inner wall of the limiting groove 10, and when the slide body 31 slides, the sub-rod body 164 is in rolling contact with the inner wall of the limiting groove 10, which can reduce the friction between the two, thereby avoiding excessive wear of the limiting rod 16 and avoiding excessive sliding of the slide body 31.

[0040] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high-precision and high-stability focusing mechanism, comprising a focusing transmission assembly (1), a focusing support assembly (2), a focusing slide assembly (3) and a slide rail (4), characterized in that: A focusing transmission assembly (1) is installed on the upper wall of the focusing support assembly (2); a focusing slide assembly (3) is arranged on the inner side of the focusing support assembly (2); a total of four slide rails (4) are provided; the four slide rails (4) are arranged between the focusing slide assembly (3) and the focusing support assembly (2); the fixed ends of the four slide rails (4) are installed on the side wall of the focusing support assembly (2); the sliding ends of the four slide rails (4) are installed on the side wall of the focusing slide assembly (3); and the focusing slide assembly (3) can slide on the inner side of the focusing support assembly (2) via the slide rails (4); A camera mounting hole (5) is provided on the side wall of the focus support assembly (2), and the focus support assembly (2) is connected to an external camera body via the camera mounting hole (5); a focal plane mounting hole (6) is provided on the side wall of the focus slide assembly (3), and the focus slide assembly (3) is connected to a focal plane of an external camera via the focal plane mounting hole (6).

2. The high-precision and high-stability focusing mechanism according to claim 1, characterized in that: The focusing transmission assembly (1) comprises a worm box (11), a worm (12), a motor bracket (13) and a motor (14); the worm box (11) is mounted at a central position above the focusing support assembly (2); the worm (12) is rotatably mounted on the inner side wall of the worm box (11); the motor bracket (13) is mounted on the side wall of the worm box (11); the motor (14) is mounted on the upper wall of the motor bracket (13); the motor (14) is electrically connected to an external power supply; and an output end of the motor (14) passes through the side wall of the worm box (11) and is connected to the worm (12).

3. A high-precision and high-stability focusing mechanism according to claim 2, characterized in that: The focus support assembly (2) comprises a focus support frame (21), a clearance groove (22), a lead screw (23), a worm wheel (24) and a lead screw nut (25); the worm box (11) is mounted at a central position above the focus support frame (21); an upper wall of the focus support frame (21) is provided with a clearance groove (22); the clearance groove (22) is arranged below the worm box (11); a lead screw (23) is rotatably mounted in the clearance groove (22); a worm wheel (24) is mounted on an outer wall of the lead screw (23); the worm wheel (24) is meshingly connected with the worm (12); a lead screw nut (25) is mounted on the outer side of the lead screw (23); the lead screw nut (25) can slide on the lead screw (23); the lead screw nut (25) is connected to the upper wall of the focus slide assembly (3) by bolts; and the camera mounting hole (5) is provided on the side wall of the focus support frame (21).

4. The high-precision and high-stability focusing mechanism according to claim 3, characterized in that: The focusing slide assembly (3) comprises a slide body (31), a focal plane mounting hole (32) and a through slot (33); the slide body (31) is slidably mounted on a side wall of a focusing support frame (21) via a slide rail (4); the side wall of the slide body (31) is provided with a focal plane mounting hole (32); the focal plane of an external camera is mounted on the side wall of the slide body (31) via the focal plane mounting hole (32); the side wall of the slide body (31) is provided with a through slot (33); the through slot (33) corresponds to the position of the focal plane of the external camera.

5. The high-precision and high-stability focusing mechanism according to claim 4, characterized in that: A grating scale probe assembly (7) is installed on the upper wall of the focusing support frame (21), and the grating scale probe assembly (7) includes a grating scale bracket (71), a grating scale (72) and a reading head (73). The grating scale bracket (71) is inserted and installed on the upper wall of the focusing support frame (21), and the grating scale (72) is installed on the upper wall of the grating scale bracket (71). The detection end of the grating scale (72) is arranged above the slide body (31), and the reading head (73) is installed above the grating scale (72), and the reading head (73) is electrically connected to the grating scale (72).

6. The high-precision and high-stability focusing mechanism according to claim 5, characterized in that: A Hall element (8) is installed on the inner side wall of the focusing support frame (21), and a magnetic steel (9) is installed on the upper wall of the sliding frame body (31), wherein the position of the magnetic steel (9) corresponds to that of the Hall element (8).

7. The high-precision and high-stability focusing mechanism according to claim 3, characterized in that: The upper wall of the focusing support frame (21) is provided with a limit groove (10), and the limit grooves (10) are provided with two in total. The two limit grooves (10) are respectively provided on the left and right sides of the clearance groove (22). The upper wall of the slide body (31) is provided with a positioning pin (15), and the positioning pins (15) are provided with two in total. The two positioning pins (15) can be respectively inserted into the two limit grooves (10), and the positioning pins (15) can slide in the limit grooves (10).

8. The high-precision and high-stability focusing mechanism according to claim 7, characterized in that: The positioning pin (15) comprises a pin body (151), an annular sliding groove (152) and a wear-resistant sleeve (153); the pin body (151) is mounted on the upper wall of the slide body (31); an annular sliding groove (152) is provided on the outer wall of the pin body (151); a wear-resistant sleeve (153) is rotatably mounted in the annular sliding groove (152); and the wear-resistant sleeve (153) can fit with the inner wall of the limiting groove (10).

9. The high-precision and high-stability focusing mechanism according to claim 7, characterized in that: A limiting rod (16) is installed on the upper wall of the slide body (31), and two limiting rods (16) are provided in total. The two limiting rods (16) can be inserted into the two limiting grooves (10) respectively, and the limiting rods (16) can slide in the limiting grooves (10).

10. The high-precision and high-stability focusing mechanism according to claim 9, characterized in that: The limiting rod (16) comprises a main rod body (161), a groove (162), a connecting hole (163), a secondary rod body (164) and a protruding rod (165); the main rod body (161) is mounted on the upper wall of the carriage body (31); the left and right side walls of the main rod body (161) are both provided with grooves (162); the upper and lower side walls of the two grooves (162) are both provided with connecting holes (163); the upper and lower ends of the secondary rod body (164) are both provided with protruding rods (165); the protruding rods (165) can be inserted and mounted in the connecting holes (163).

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