Focusing module

Abstract

The utility model discloses a focusing module, which comprises a fixed base, a focusing driving mechanism, a movable focusing ring and a movable mirror frame, a base cylinder part of the fixed base is provided with a base light through hole, the movable focusing ring is rotatably sleeved on the periphery of the base cylinder part, and the movable focusing ring is driven by the focusing driving mechanism; at least two guide rods are screwed on the outer side wall of the movable lens frame; the outer end part of each guide rod respectively penetrates through a corresponding base guide long hole of the base cylinder part and is embedded and inserted into a corresponding focusing ring inclined hole of the movable focusing ring; a first magnetic attraction piece is arranged on the inner wall of the light through hole of the base, a second magnetic attraction piece is arranged on the outer side wall of the movable mirror frame, and the first magnetic attraction piece and the second magnetic attraction piece are arranged in a staggered mode in the Z-axis direction; and the movable mirror frame is subjected to the combined action of the radial retention force and the axial retention force under the magnetic action of the first magnetic attraction piece on the second magnetic attraction piece. By means of the structural design, the focusing device has the advantages of being novel in structural design, good in stability and reliability and high in focusing precision.

Description

Technical Field

[0001] The utility model relates to the technical field of optical devices, in particular to a focusing module. Background Art

[0002] The Chinese utility model patent with the patent number ZL202221963411.7 and the patent name of "A New Type of Magnetic Attraction Type Focusing Module Structure" specifically discloses the following technical solutions: specifically, a new type of magnetic attraction type focusing module structure includes a fixed base, a movable lens frame, and a camera lens. The camera lens is installed in the movable lens frame. The fixed base is provided with a base accommodation cavity (base light passing hole) that completely penetrates up and down. The movable lens frame is embedded in the base accommodation cavity of the fixed base. The fixed base is provided with a focusing drive mechanism, and the focusing drive mechanism is drivingly connected to the movable lens frame. The fixed base is provided with a fixed magnet, and the movable lens frame is provided with a movable magnetic attraction member. The movable magnetic attraction member is located on the upper side of the fixed magnet. The movable lens frame is provided with at least two frame guiding members that respectively extend horizontally outward. The fixed base is respectively provided with a base guiding groove that completely penetrates horizontally and extends vertically corresponding to each frame guiding member. Each frame guiding member respectively passes through the corresponding base guiding groove from the inside to the outside, and the outer end portions of each frame guiding member respectively extend to the outer end side of the fixed base. An outer focusing ring is sleeved outside the fixed base. The outer focusing ring is respectively provided with a focusing ring inclined hole that completely penetrates horizontally and extends obliquely corresponding to each frame guiding member. The outer end portions of each frame guiding member are respectively inserted into the corresponding focusing ring inclined holes. The focusing drive mechanism is drivingly connected to the outer focusing ring.

[0003] When the above new type of magnetic attraction type focusing module structure works, since the movable magnetic attraction member is installed on the movable lens frame and the fixed magnet is installed on the fixed base, the fixed magnet magnetically attracts the movable magnetic attraction member of the movable lens frame, and the magnetic attraction force of the fixed magnet on the movable magnetic attraction member keeps downward (i.e., the axial holding force), that is, the movable lens frame and the camera lens are always subjected to a downward axial holding force during use. When the movable lens frame and the camera lens are shaken by an external impact during use, after the impact shaking is eliminated, the axial holding force can make the movable lens frame reset. Therefore, theoretically, there is no Z-axis movement of the movable lens frame, that is, the camera lens has no defocusing.

[0004] It should be noted that for the above-mentioned novel magnetic attraction type focusing module structure, since the movable magnetic attraction member and the fixed magnet are arranged at intervals up and down, that is, the fixed magnet only has an axial holding force on the movable spectacle frame, and this axial holding force can realize the functions of no crosstalk and no defocusing of the movable spectacle frame in the Z-axis direction; however, because the fixed base has no radial holding force on the movable spectacle frame and the movable spectacle frame is movably installed in the base through hole of the fixed base, there is inevitably a radial gap between the movable spectacle frame and the fixed base. Without the action of the radial holding force, when the movable spectacle frame shakes due to external impact, the problem of radial crosstalk of the movable spectacle frame will occur. When the external impact and shaking are eliminated, the movable spectacle frame still will not reset to a concentric state with the base through hole of the fixed base, and the use stability, reliability and use accuracy are poor. Summary of the Invention

[0005] The purpose of the present invention is to provide a focusing module for the deficiencies of the prior art. The structure of the focusing module is novel in design, good in stability and reliability, and high in focusing accuracy.

[0006] To achieve the above purpose, the present invention is realized through the following technical solutions.

[0007] A focusing module includes a fixed base, a focusing driving mechanism, a movable focusing ring, and a movable spectacle frame. The fixed base is provided with a base cylindrical part in a cylindrical shape, and a base through hole in a circular hole shape vertically penetrating is opened in the core part of the base cylindrical part. The movable focusing ring is rotatably sleeved on the periphery of the base cylindrical part. The movable spectacle frame is movably embedded in the base through hole, and a magnetic attraction assembly is installed between the fixed base and the movable spectacle frame.

[0008] The focusing driving mechanism is installed on the fixed base and is located beside the base cylindrical part. The focusing driving mechanism is drivingly connected to the movable focusing ring.

[0009] At least two guide rods respectively radially protruding and extending outward are screwed on the outer side wall of the movable spectacle frame. The base cylindrical part is respectively provided with vertically extending base guiding long holes corresponding to the guide rods. The movable focusing ring is respectively provided with obliquely extending focusing ring inclined holes corresponding to the guide rods. The outer end parts of the guide rods respectively pass through the corresponding base guiding long holes and are inserted into the corresponding focusing ring inclined holes.

[0010] A first magnetic attraction member is installed on the inner wall of the base through hole, and a second magnetic attraction member is installed on the outer side wall of the movable spectacle frame, and the first magnetic attraction member and the second magnetic attraction member are arranged in a staggered manner in the Z-axis direction.

[0011] The magnetic force action of the first magnetic attraction member on the second magnetic attraction member enables the movable spectacle frame to be jointly acted on by a radial holding force and an axial holding force.

[0012] Among them, the first magnetic attraction member includes a number of base magnets that are annularly arrayed around the axis of the through-hole of the base, and each base magnet is fixedly installed on the inner wall of the through-hole of the base;

[0013] The second magnetic attraction member includes a number of frame magnets that are annularly arrayed around the axis of the movable frame, and each frame magnet is fixedly installed on the outer side wall of the movable frame. The number of base magnets is the same as the number of frame magnets.

[0014] Among them, the first magnetic attraction member includes a number of single magnets that are annularly arrayed around the axis of the through-hole of the base, and each single magnet is fixedly installed on the inner wall of the through-hole of the base;

[0015] The second magnetic attraction member is an annular iron piece in the shape of a ring. The annular iron piece is tightly sleeved on the outer side wall of the movable frame and the annular magnet is coaxially arranged with the movable frame.

[0016] Among them, the first magnetic attraction member is an annular iron piece in the shape of a ring. The annular iron piece is fixedly installed on the inner wall of the through-hole of the base and the annular iron piece is coaxially arranged with the through-hole of the base;

[0017] The second magnetic attraction member includes a number of single magnets that are annularly arrayed around the axis of the movable frame, and each single magnet is fixedly installed on the outer side wall of the movable frame.

[0018] Among them, a number of inwardly protruding inner convex parts are provided at the upper edge part of the movable focusing ring. An annular groove in the shape of a ring is opened at the upper end part of the outer side wall of the base cylindrical part, and avoiding grooves that open upward and whose lower ends communicate with the annular groove are respectively opened on the outer side wall of the base cylindrical part corresponding to each inner convex part;

[0019] Each inner convex part of the movable focusing ring is respectively inserted into the annular groove through the corresponding avoiding groove.

[0020] Among them, a cover plate is screwed on the upper end part of the base cylindrical part. The cover plate is provided with a limiting inner ring located in the through-hole of the base and a limiting outer ring located outside the base cylindrical part. The limiting inner ring is located above the first magnetic attraction member;

[0021] A limiting convex platform protruding downward is provided on the lower surface of the limiting outer ring. The limiting convex platform is in contact with the upper surface of the movable focusing ring.

[0022] Among them, a retaining ring in the shape of a ring is screwed or buckled on the upper end part of the base cylindrical part. The retaining ring is located in the through-hole of the base and the retaining ring is located above the first magnetic attraction member;

[0023] A limiting convex part protruding and extending to the outside of the base cylindrical part is provided at the edge part of the retaining ring. The limiting convex part is in contact with the upper surface of the movable focusing ring.

[0024] Compared with the prior art, the utility model has the following beneficial effects. Specifically, due to the magnetic force of the first magnetic member on the second magnetic member, the movable lens frame is subjected to the combined action of a radial holding force and an axial holding force. The axial holding force can effectively ensure that when the external impact and shaking are eliminated, the movable lens frame axially resets to the fixed state to avoid axial movement and displacement of the movable lens frame, thereby ensuring that there is no axial movement and no defocus of the movable lens frame in the Z-axis direction; the radial holding force can effectively ensure that when the external impact and shaking are eliminated, the movable lens frame resets to the state concentric with the light passing hole of the base to avoid radial movement and displacement of the movable lens frame, thereby ensuring that there is no radial movement of the movable lens frame. The magnetic component of the utility model can enable the movable lens frame to be simultaneously subjected to the axial holding force and the radial holding force during use. After the external impact and shaking are eliminated, the movable lens frame has no axial or radial movement and displacement, which can effectively improve the stability, reliability and high focusing accuracy of the focusing module. Therefore, the focusing module of the utility model has the advantages of novel structural design, good stability and reliability, and high focusing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following uses the drawings to further illustrate the utility model, but the embodiments in the drawings do not constitute any limitation to the utility model.

[0026] Figure 1 It is a schematic structural diagram of the first embodiment of the utility model.

[0027] Figure 2 is Figure 1 exploded view of.

[0028] Figure 3 It is a half-sectional view of the first embodiment of the utility model.

[0029] Figure 4 It is a schematic structural diagram of the second embodiment of the utility model.

[0030] Figure 5 is Figure 4 exploded view of.

[0031] Figure 6 It is a schematic structural diagram of the third embodiment of the utility model.

[0032] Figure 7 is Figure 6 exploded view of.

[0033] In Figures 1 to 7 includes:

[0034] 1 - Fixed base; 11 - Base cylinder part; 12 - Base light passing hole; 13 - Base guiding long hole; 14 - Annular groove; 15 - Clearance groove; 2 - Focusing drive mechanism; 3 - Movable focusing ring; 31 - Focusing ring inclined hole; 32 - Inner convex part; 4 - Movable lens frame; 5 - Guide rod; 61 - First magnetic part; 62 - Second magnetic part; 63 - Base magnet; 64 - Lens frame magnet; 65 - Monomer magnet; 66 - Annular iron part; 7 - Cover plate; 71 - Limiting inner ring; 72 - Limiting outer ring; 721 - Limiting boss; 8 - Retaining ring; 81 - Limiting convex part. Detailed implementation mode

[0035] The present utility model will be described below in conjunction with specific implementation modes.

[0036] Embodiment 1, as Figures 1 to 7 shown, a focusing module includes a fixed base 1, a focusing drive mechanism 2, a movable focusing ring 3, and a movable lens frame 4. The fixed base 1 is provided with a base cylinder part 11 in a cylindrical shape. A base light passing hole 12 in a circular hole shape vertically penetrating is provided in the core of the base cylinder part 11. The movable focusing ring 3 is rotatably sleeved on the periphery of the base cylinder part 11. The movable lens frame 4 is movably embedded in the base light passing hole 12, and a magnetic attraction assembly is installed between the fixed base 1 and the movable lens frame 4.

[0037] Among them, as Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 , and Figure 7 shown, the focusing drive mechanism 2 is installed on the fixed base 1 and the focusing drive mechanism 2 is located beside the base cylinder part 11. The focusing drive mechanism 2 is drivingly connected to the movable focusing ring 3. It should be explained that for the focusing drive mechanism 2 of this Embodiment 1, it is already prior art and will not be elaborated here.

[0038] Furthermore, as Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 , and Figure 7 shown, at least two guide rods 5 respectively radially protruding and extending outward are screwed on the outer side wall of the movable lens frame 4. The base cylinder part 11 is respectively provided with vertically extending base guiding long holes 13 corresponding to the guide rods 5. The movable focusing ring 3 is respectively provided with inclined extending focusing ring inclined holes 31 corresponding to the guide rods 5. The outer end parts of the guide rods 5 respectively pass through the corresponding base guiding long holes 13 and are inserted into the corresponding focusing ring inclined holes 31.

[0039] Further, a first magnetic member 61 is installed on the inner wall of the base light transmission hole 12, and a second magnetic member 62 is installed on the outer side wall of the movable lens frame 4. The first magnetic member 61 and the second magnetic member 62 are arranged in a staggered manner in the Z-axis direction. The magnetic force of the first magnetic member 61 on the second magnetic member 62 causes the movable lens frame 4 to be jointly affected by a radial holding force and an axial holding force. The first magnetic member 61 and the second magnetic member 62 jointly form a magnetic attraction assembly.

[0040] Specifically, as Figures 1 to 3 shown, the first magnetic member 61 includes a plurality of base magnets 63 that are annularly arrayed around the axis of the base light transmission hole 12, and each base magnet 63 is fixedly installed on the inner wall of the base light transmission hole 12. The second magnetic member 62 includes a plurality of lens frame magnets 64 that are annularly arrayed around the axis of the movable lens frame 4, and each lens frame magnet 64 is fixedly installed on the outer side wall of the movable lens frame 4. The number of base magnets 63 is the same as the number of lens frame magnets 64.

[0041] It should be explained that all the base magnets 63 in the first magnetic member 61 are horizontally aligned, and all the lens frame magnets 64 in the second magnetic member 62 are horizontally aligned. As Figure 3 shown, there is a height difference H between the center position height of the first magnetic member 61 and the center position height of the second magnetic member 62 to achieve the staggered arrangement of the first magnetic member 61 and the second magnetic member 62 in the Z-axis direction. Moreover, the number of base magnets 63 is the same as the number of lens frame magnets 64, and each base magnet 63 is radially aligned with a lens frame magnet 64.

[0042] For the focusing module of the first embodiment, during the process of realizing the focusing action, the focusing drive assembly drives the movable focusing ring 3 to rotate relative to the base cylindrical portion 11. The rotating movable focusing ring 3 acts on the corresponding guide rod 5 through its focusing ring inclined hole 31 and causes each guide rod 5 to move up and down relative to the corresponding base guiding long hole 13. The guide rod 5 that moves up and down relative to the base cylindrical portion 11 drives the movable lens frame 4 to move up and down synchronously, thereby realizing the focusing action.

[0043] It should be noted that during the working process of the first embodiment, there is a magnetic force between the first magnetic member 61 and the second magnetic member 62, and this magnetic force can be an attractive force or a repulsive force. When the polarity of the inner surface of the base magnet 63 is the same as the polarity of the outer surface of the lens frame magnet 64, this magnetic force is a repulsive force. When the polarity of the inner surface of the base magnet 63 is opposite to the polarity of the outer surface of the lens frame magnet 64, this magnetic force is an attractive force. Since the first magnetic member 61 and the second magnetic member 62 are arranged in a staggered manner in the Z-axis direction, the magnetic force between each base magnet 63 and the corresponding lens frame magnet 64 can be decomposed into a radial acting force and an axial acting force. This radial acting force can form a radial holding force acting on the movable lens frame 4, and this axial acting force can form an axial holding force acting on the movable lens frame 4.

[0044] For the axial holding force formed by the magnetic force between the first magnetic member 61 and the second magnetic member 62, this axial holding force can effectively ensure that the movable lens frame 4 axially resets to the fixed state when the external impact and vibration are eliminated, so as to avoid the axial displacement of the movable lens frame 4, and further ensure that the movable lens frame 4 has no axial movement and no defocusing in the Z-axis direction. For the radial holding force formed by the magnetic force between the first magnetic member 61 and the second magnetic member 62, since the multiple base magnets 63 of the first magnetic member 61 are distributed in a circular array and the multiple lens frame magnets 64 of the second magnetic member 62 are also distributed in a circular array, the movable lens frame 4 will be subjected to the radial forces distributed in a circular array. The above radial holding force can effectively ensure that the movable lens frame 4 resets to the concentric state with the base through-hole 12 when the external impact and vibration are eliminated, so as to avoid the radial displacement of the movable lens frame 4, and further ensure that the movable lens frame 4 has no radial movement.

[0045] For the magnetic component of the first embodiment, it can enable the movable lens frame 4 to be simultaneously affected by the axial holding force and the radial holding force during use. After the external impact and vibration are eliminated, the movable lens frame 4 has no axial or radial displacement. This can effectively improve the stability and reliability of the focusing module and the focusing accuracy is high. Therefore, the focusing module of the first embodiment has the advantages of novel structural design, good stability and reliability, and high focusing accuracy.

[0046] Embodiment 2, as Figure 4 and Figure 5 shown, the difference between the second embodiment and the first embodiment is that: the first magnetic member 61 includes a plurality of individual magnets 65 distributed in a circular array centered on the axis of the base through-hole 12, and each individual magnet 65 is fixedly installed on the inner wall of the base through-hole 12.

[0047] Among them, the second magnetic member 62 is an annular iron member 66 in a circular ring shape. The annular iron member 66 is sleeved and fixed on the outer side wall of the movable lens frame 4 and the annular magnet is coaxially arranged with the movable lens frame 4.

[0048] For the magnetic component of the second embodiment, there is a magnetic suction force between each individual magnet 65 of the first magnetic member 61 and the annular iron member 66; since the first magnetic member 61 of the fixed base 1 and the annular iron member 66 on the movable lens frame 4 are arranged in a dislocation in the Z-axis direction, the magnetic suction force between each individual magnet 65 and the annular iron member 66 can be decomposed into a radial acting force and an axial acting force. The radial acting force can form a radial holding force acting on the movable lens frame 4, and the axial acting force can form an axial holding force acting on the movable lens frame 4.

[0049] Embodiment 3, as Figure 6 and Figure 7As shown in the figure, the difference between the third embodiment and the first embodiment is that: the first magnetic attraction member 61 is an annular iron member 66 in the shape of a ring, and the annular iron member 66 is fixedly installed on the inner wall of the base light passing hole 12 and the annular iron member 66 is coaxially arranged with the base light passing hole 12.

[0050] Among them, the second magnetic attraction member 62 includes a plurality of single magnets 65 distributed in an annular array centered on the axis of the movable lens frame 4, and each single magnet 65 is fixedly installed on the outer side wall of the movable lens frame 4.

[0051] For the magnetic attraction assembly of the third embodiment, there is a magnetic attraction force between each single magnet 65 of the second magnetic attraction member 62 and the annular iron member 66; since the second magnetic attraction member 62 of the movable lens frame 4 and the annular iron member 66 on the fixed base 1 are arranged in a dislocation manner in the Z-axis direction, the magnetic attraction force between each single magnet 65 and the annular iron member 66 can be decomposed into a radial acting force and an axial acting force. The radial acting force can form a radial holding force acting on the movable lens frame 4, and the axial acting force can form an axial holding force acting on the movable lens frame 4.

[0052] Embodiment Four, as Figure 4 and Figure 5 shown in the figure, the difference between the fourth embodiment and the first embodiment is that: a plurality of inwardly protruding inner convex portions 32 are provided at the upper edge portion of the movable focusing ring 3, an annular groove 14 in the shape of a ring is provided at the upper end portion of the outer side wall of the base cylindrical portion 11, and an avoidance groove 15 with an upward opening and a lower end communicating with the annular groove 14 is provided on the outer side wall of the base cylindrical portion 11 corresponding to each inner convex portion 32.

[0053] Among them, each inner convex portion 32 of the movable focusing ring 3 is inserted into the annular groove 14 through the corresponding avoidance groove 15.

[0054] During the process of the focusing drive mechanism 2 driving the movable focusing ring 3 to rotate, each inner convex portion 32 of the movable focusing ring 3 rotates along the annular groove 14, and the annular groove 14 can realize the vertical limit of the movable focusing ring 3.

[0055] Embodiment Five, as Figures 1 to 3 shown in the figure, the difference between the fifth embodiment and the first embodiment is that: a cover plate 7 is screwed on the upper end portion of the base cylindrical portion 11, the cover plate 7 is provided with a limiting inner ring 71 located in the base light passing hole 12 and a limiting outer ring 72 located outside the base cylindrical portion 11, and the limiting inner ring 71 is located above the first magnetic attraction member 61.

[0056] Among them, a downwardly protruding limiting boss 721 is provided on the lower surface of the limiting outer ring 72, and the limiting boss 721 is in contact with the upper surface of the movable focusing ring 3.

[0057] The limiting outer ring 72 limits the upper part of the movable focusing ring 3 through the limiting boss 721. The limiting outer ring 72 cooperates with the fixed base 1, enabling the movable focusing ring 3 to stably rotate around the outer periphery of the base cylinder part 11.

[0058] It should be explained that the limiting outer ring 72 contacts the upper surface of the movable focusing ring 3 through the limiting boss 721. This structural design can effectively reduce the contact area between the movable focusing ring 3 and the limiting outer ring 72, thereby reducing the friction between the two and improving the smoothness of the rotation movement of the movable focusing ring 3.

[0059] The limiting inner ring 71 is located within the base light passing hole 12 and above the first magnetic attracting member 61. The limiting inner ring 71 can limit the first magnetic attracting member 61 to ensure that the first magnetic attracting member 61 is stably and reliably installed on the inner wall of the base light passing hole 12.

[0060] Embodiment Six, as Figure 6 and Figure 7 shown, the difference between this Embodiment Six and Embodiment One lies in that: a pressing ring 8 in the shape of a ring is screwed or buckled to the upper end part of the base cylinder part 11. The pressing ring 8 is located within the base light passing hole 12 and above the first magnetic attracting member 61.

[0061] Among them, a limiting convex part 81 protruding and extending to the outside of the base cylinder part 11 is provided at the edge part of the pressing ring 8, and the limiting convex part 81 contacts the upper surface of the movable focusing ring 3.

[0062] It should be explained that the pressing ring 8 is located within the base light passing hole 12 and above the first magnetic attracting member 61. The pressing ring 8 can limit the first magnetic attracting member 61 to ensure that the first magnetic attracting member 61 is stably and reliably installed on the inner wall of the base light passing hole 12.

[0063] The limiting convex part 81 of the pressing ring 8 contacts the upper surface of the movable focusing ring 3. The limiting convex part 81 can limit the movable focusing ring 3 to enable the movable focusing ring 3 to stably rotate around the outer periphery of the base cylinder part 11.

[0064] The above content is only the preferred embodiment of the present utility model. For those of ordinary skill in the art, based on the idea of the present utility model, there will be changes in the specific implementation manners and application scopes. The content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A focusing module, comprising a fixed base (1), a focusing drive mechanism (2), a movable focusing ring (3), and a movable lens frame (4). The fixed base (1) is provided with a base cylindrical portion (11) in a cylindrical shape. A base light passing hole (12) vertically penetrating and in a circular hole shape is formed in the core of the base cylindrical portion (11). The movable focusing ring (3) is rotatably sleeved outside the base cylindrical portion (11). The movable lens frame (4) is movably embedded in the base light passing hole (12), and a magnetic attraction assembly is installed between the fixed base (1) and the movable lens frame (4). The focusing drive mechanism (2) is installed on the fixed base (1) and is located beside the base cylindrical portion (11). The focusing drive mechanism (2) is drivingly connected to the movable focusing ring (3). At least two guide rods (5) respectively protruding radially outward are screwed on the outer side wall of the movable lens frame (4). The base cylindrical portion (11) is respectively provided with base guiding long holes (13) extending vertically corresponding to the guide rods (5). The movable focusing ring (3) is respectively provided with focusing ring inclined holes (31) extending obliquely corresponding to the guide rods (5). The outer end portions of the guide rods (5) respectively pass through the corresponding base guiding long holes (13) and are inserted into the corresponding focusing ring inclined holes (31). It is characterized in that: A first magnetic attraction member (61) is installed on the inner wall of the base light passing hole (12). A second magnetic attraction member (62) is installed on the outer side wall of the movable lens frame (4), and the first magnetic attraction member (61) and the second magnetic attraction member (62) are arranged in a staggered manner in the Z-axis direction. The magnetic force of the first magnetic attraction member (61) on the second magnetic attraction member (62) enables the movable lens frame (4) to be jointly affected by a radial holding force and an axial holding force.

2. The focusing module according to claim 1, characterized in that: The first magnetic attraction member (61) includes a plurality of base magnets (63) annularly arrayed around the axis of the base light passing hole (12). Each base magnet (63) is fixedly installed on the inner wall of the base light passing hole (12). The second magnetic attraction member (62) includes a plurality of lens frame magnets (64) annularly arrayed around the axis of the movable lens frame (4). Each lens frame magnet (64) is fixedly installed on the outer side wall of the movable lens frame (4). The number of the base magnets (63) is the same as the number of the lens frame magnets (64).

3. The focusing module according to claim 1, wherein: The first magnetic attraction member (61) includes a plurality of single magnets (65) annularly arrayed around the axis of the base light passing hole (12). Each single magnet (65) is fixedly installed on the inner wall of the base light passing hole (12). The second magnetic attraction member (62) is an annular iron member (66) in a circular ring shape. The annular iron member (66) is sleeved and fixedly installed on the outer side wall of the movable lens frame (4), and the annular magnet is coaxially arranged with the movable lens frame (4).

4. The focusing module according to claim 1, wherein: The first magnetic attraction member (61) is an annular iron member (66) in a circular ring shape. The annular iron member (66) is fixedly installed on the inner wall of the base light passing hole (12), and the annular iron member (66) is coaxially arranged with the base light passing hole (12). The second magnetic member (62) includes a plurality of single magnets (65) that are annularly and arrayedly distributed around the axis of the movable frame (4), and each single magnet (65) is fixedly installed on the outer sidewall of the movable frame (4).

5. The focusing module according to claim 1, characterized in that: A plurality of inwardly protruding inner protrusions (32) are provided at the upper edge portion of the movable focusing ring (3), and an annular groove (14) in the shape of a ring is formed at the upper end portion of the outer sidewall of the base cylindrical portion (11). Moreover, clearance grooves (15) that are open upward and whose lower ends communicate with the annular groove (14) are respectively formed in the outer sidewall of the base cylindrical portion (11) corresponding to the respective inner protrusions (32). Each of the inner protrusions (32) of the movable focusing ring (3) is respectively inserted into the annular groove (14) through the corresponding clearance groove (15).

6. The focusing module according to claim 1, wherein: A cover plate (7) is screwed onto the upper end portion of the base cylindrical portion (11). The cover plate (7) is provided with a limiting inner ring (71) located in the base light passing hole (12) and a limiting outer ring (72) located outside the base cylindrical portion (11). The limiting inner ring (71) is located above the first magnetic member (61). A limiting boss (721) protruding downward is provided on the lower surface of the limiting outer ring (72), and the limiting boss (721) is in contact with the upper surface of the movable focusing ring (3).

7. The focusing module according to claim 1, wherein: A ring-shaped retaining ring (8) is screwed or snapped onto the upper end portion of the base cylindrical portion (11). The retaining ring (8) is located in the base light passing hole (12) and the retaining ring (8) is located above the first magnetic member (61). A limiting protrusion (81) protruding and extending to the outside of the base cylindrical portion (11) is provided at the edge portion of the retaining ring (8), and the limiting protrusion (81) is in contact with the upper surface of the movable focusing ring (3).

Images