Novel AF focusing module

Abstract

The invention discloses a novel AF focusing module, which comprises a fixed base, a focusing driving assembly, a movable focusing ring and a movable lens frame, and is characterized in that the movable focusing ring rotatably sleeves the periphery of a cylindrical part of the base; the focusing driving assembly comprises a stepping gear motor, and an output gear at the output end of the stepping gear motor is meshed with the outer gear part of the movable focusing ring; a guide rod on the outer side wall of the movable mirror frame penetrates through a base guide long hole of the base cylinder part and is embedded and inserted into a 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 fixed in the corresponding limiting installation grooves in a dispensing mode respectively; and the movable mirror frame is subjected to the combined action of radial and axial holding forces under the magnetic action of the first magnetic attraction piece on the second magnetic attraction piece. The novel AF focusing module has the advantages of being novel in structural design, good in stability and reliability and high in focusing precision.

Description

Technical Field

[0001] The present invention relates to the technical field of optical devices, and in particular to a novel AF focusing module. Background Art

[0002] The patent number is: ZL202221963411.7, and the patent name is: A Chinese utility model patent for a new type of magnetic focusing module structure, which specifically discloses the following technical solutions, specifically: a new type of magnetic focusing module structure, including a fixed base, a movable frame, and a camera lens, the camera lens is mounted on the movable frame, the fixed base is provided with a base accommodating cavity (base light hole) that completely penetrates from top to bottom, and the movable frame is embedded in the base accommodating cavity of the fixed base; the fixed base is provided with a focusing drive assembly, and the focusing drive assembly is connected to the movable frame drive; the fixed base is provided with a fixed magnet, and the movable frame is provided with a movable magnetic suction member, and the movable magnetic suction member is located on the upper end side of the fixed magnet; the movable frame is provided with at least two frame guides that extend laterally outward, respectively, and the fixed base is provided with base guides that completely penetrate laterally and extend vertically corresponding to each frame guide. The outer end of each frame guide piece extends to the outer end side of the fixed base; an outer focusing ring is sleeved on the periphery of the fixed base, and the outer focusing ring is provided with a focusing ring oblique hole which completely penetrates horizontally and extends obliquely corresponding to each frame guide piece, and the outer end of each frame guide piece is respectively inserted into the corresponding focusing ring oblique hole; a focusing drive assembly is connected to the outer focusing ring drive, and the focusing drive assembly includes a reduction gear box housing which is screwed and fastened to the fixed base, and a reduction gear box accommodating cavity which opens to the outer focusing ring side is formed inside the reduction gear box housing, and a reduction gear set is embedded in the reduction gear box accommodating cavity, and a stepping motor is screwed and fastened on the outer surface of the reduction gear box housing, and the outer focusing ring is provided with a focusing ring gear part, and the focusing ring gear part and the outer focusing ring are an integrated structure, and the power output shaft, the reduction gear group and the focusing ring gear part of the stepping motor are sequentially driven and connected.

[0003] When the above-mentioned new magnetic focusing module structure is working, since the movable magnetic part is installed on the movable frame and the fixed magnet is installed on the fixed base, the fixed magnet holds the movable magnetic part of the movable frame by magnetic attraction, and the adsorption force of the fixed magnet on the movable magnetic part remains downward (i.e., axial holding force). In other words, the movable frame and the camera lens are always subjected to the downward axial holding force when in use. When the movable frame and the camera lens are subjected to external shock and shaking during use, after the shock and shaking are eliminated, the axial holding force can reset the movable frame. Therefore, theoretically, there is no movement of the movable frame on the Z-axis, i.e., there is no out-of-focus of the camera lens.

[0004] It should be pointed out that, for the above-mentioned new magnetic focusing module structure, since the movable magnetic suction parts and the fixed magnets are arranged at intervals up and down, that is, the fixed magnets only have an axial holding force on the movable mirror frame, and the axial holding force can realize the function of no movement and no false focus of the movable mirror frame in the Z axis; however, because the fixed base has no radial holding force on the movable mirror frame and the movable mirror frame is movably installed in the base light hole of the fixed base, there is inevitably a radial gap between the movable mirror frame and the fixed base. In the absence of radial holding force, when the movable mirror frame is shaken by external impact, the movable mirror frame will have the problem of radial movement. When the external impact and shaking are eliminated, the movable mirror frame still will not reset to the concentric state with the base light hole of the fixed base, and the stability, reliability and accuracy of use are poor. Summary of the invention

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

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

[0007] A novel AF focusing module comprises a fixed base, a focusing drive assembly, a movable focusing ring, and a movable lens frame, wherein the fixed base is provided with a base cylindrical portion in a cylindrical shape, the core of the base cylindrical portion is provided with a base light-through hole which penetrates vertically and is in the shape of a circular hole, the movable focusing ring is rotatably sleeved on the outer periphery of the base cylindrical portion, the movable lens frame is movably embedded in the base light-through hole, and a magnetic suction assembly is installed between the fixed base and the movable lens frame;

[0008] The focus drive assembly includes a stepping reduction motor which is screwed and fastened to the fixed base and is located beside the cylindrical part of the base, and the output end of the stepping reduction motor is an output gear; the movable focus ring is provided with an external gear part, and the output gear of the stepping reduction motor is meshed with the external gear part of the movable focus ring;

[0009] The outer wall of the movable lens frame is screwed with at least two guide rods which protrude radially outwards, the cylindrical part of the base is provided with vertically extending base guide long holes corresponding to the guide rods, the movable focus ring is provided with obliquely extending focus ring inclined holes corresponding to the guide rods, the outer end of each guide rod passes through the corresponding base guide long hole and is inserted into the corresponding focus ring inclined hole;

[0010] A first magnetic member is installed on the inner wall of the light hole of the base, and a second magnetic member is installed on the outer wall of the movable mirror frame. The first magnetic member and the second magnetic member are staggered in the Z-axis direction, and the first magnetic member and the second magnetic member together constitute the magnetic assembly;

[0011] A first limit installation groove is formed on the inner wall of the light hole of the base corresponding to the first magnetic component, and the first magnetic component is fixedly installed in the first limit installation groove by glue. A second limit installation groove is formed on the outer wall of the movable mirror frame corresponding to the second magnetic component, and the second magnetic component is fixedly installed in the second limit installation groove by glue.

[0012] The magnetic force of the first magnetic attraction component on the second magnetic attraction component causes the movable mirror frame to be subjected to the combined action of radial retaining force and axial retaining force.

[0013] Wherein, the first magnetic attraction member includes a plurality of base magnets distributed in a circular array with the axis of the base light hole as the center, and each base magnet is respectively fastened to the inner wall of the base light hole;

[0014] The second magnetic attraction component includes a plurality of frame magnets distributed in a circular array with the axis of the movable frame as the center, and each frame magnet is fastened to the outer wall of the movable frame; the number of base magnets is consistent with the number of frame magnets, and the first magnet group and the second magnet group are staggered in the Z-axis direction.

[0015] Wherein, the first magnetic attraction member includes a plurality of single magnets distributed in a circular array with the axis of the light-through hole of the base as the center, and each single magnet is respectively fastened and installed on the inner wall of the light-through hole of the base;

[0016] The second magnetic attraction member is an annular iron member in the shape of a circular ring. The annular iron member is set and fastened to the outer side wall of the movable mirror frame, and the annular magnet is coaxially arranged with the movable mirror frame.

[0017] Wherein, the first magnetic attraction member is an annular iron member in the shape of a circular ring, the annular iron member is fixedly mounted on the inner wall of the light-through hole of the base and the annular iron member is coaxially arranged with the light-through hole of the base;

[0018] The second magnetic attraction member includes a plurality of single magnets distributed in a circular array with the axis of the movable mirror frame as the center, and each single magnet is respectively fastened to the outer side wall of the movable mirror frame.

[0019] The upper edge of the movable focus ring is provided with a plurality of inwardly protruding inner convex portions, the upper end of the outer wall of the cylindrical portion of the base is provided with an annular groove in the shape of an annulus, and the outer wall of the cylindrical portion of the base is provided with an upwardly opening escape groove corresponding to each of the inwardly protruding portions and the lower end of which is connected to the annular groove;

[0020] Each inner convex part of the movable focus ring is inserted into the annular groove through the corresponding air-avoiding groove.

[0021] The upper end of the cylindrical portion of the base is screwed with a cover plate, and the cover plate is provided with a limiting inner ring located in the light-through hole of the base and a limiting outer ring located outside the cylindrical portion of the base, and the limiting inner ring is located above the first magnetic attraction member;

[0022] The lower surface of the limiting outer ring is provided with a limiting boss protruding downward, and the limiting boss contacts the upper surface of the movable focusing ring.

[0023] Wherein, a ring-shaped pressing ring is screwed or buckled on the upper end of the cylindrical portion of the base, and the pressing ring is located in the light-through hole of the base and above the first magnetic attraction member;

[0024] The edge of the pressure ring is provided with a limiting convex portion which protrudes and extends to the outside of the cylindrical portion of the base, and the limiting convex portion contacts the upper surface of the movable focusing ring.

[0025] Wherein, the stepping reduction motor comprises a motor seat screwed and fastened to the fixed base, a reduction gear set is installed inside the motor seat through a gear shaft, and the output end gear of the reduction gear set is the output gear;

[0026] The upper end of the motor seat is screwed with a stepper motor, and the power output shaft of the stepper motor is connected with the input end gear of the reduction gear set.

[0027] Compared with the prior art, the present invention has the following beneficial effects, specifically:

[0028] Due to the magnetic force of the first magnetic attraction component on the second magnetic attraction component, the movable mirror frame is subjected to the combined action of radial holding force and axial holding force. The axial holding force can effectively ensure that the movable mirror frame is axially reset to a fixed state when the external impact and shaking are eliminated, so as to avoid the axial movement and displacement of the movable mirror frame, thereby ensuring that the movable mirror frame has no movement and no false focus in the Z-axis direction; the radial holding force can effectively ensure that the movable mirror frame is reset to a state concentric with the light hole of the base when the external impact and shaking are eliminated, so as to avoid the radial movement and displacement of the movable mirror frame, thereby ensuring that the movable mirror frame has no radial movement. The magnetic attraction component of the present invention can make the movable mirror frame be subjected to the simultaneous action of axial holding force and radial holding force when in use. After the external impact and shaking are eliminated, the movable mirror frame has no axial and radial movement and displacement, which can effectively improve the stability and reliability of the focusing module and the high focusing accuracy; therefore, the new AF focusing module of the present invention has the advantages of novel structural design, good stability and reliability, and high focusing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is further described below with the aid of the accompanying drawings. However, the embodiments in the accompanying drawings do not constitute any limitation to the present invention.

[0030] Figure 1 It is a schematic structural diagram of the first embodiment of the present invention.

[0031] Figure 2 for Figure 1 Schematic diagram of the decomposition.

[0032] Figure 3 It is a half-section schematic diagram of a first embodiment of the present invention.

[0033] Figure 4 It is a schematic structural diagram of a second embodiment of the present invention.

[0034] Figure 5 for Figure 4 Schematic diagram of the decomposition.

[0035] Figure 6 It is a schematic structural diagram of a third embodiment of the present invention.

[0036] Figure 7 for Figure 6 Schematic diagram of the decomposition.

[0037] exist Figures 1 to 7 Included are:

[0038] 1-fixed base; 11-cylindrical part of base; 12-light hole of base; 13-long guide hole of base; 14-first limit installation groove; 15-annular groove; 16-avoidance groove; 2-focusing drive assembly; 21-stepping reduction motor; 22-output gear; 23-motor seat; 24-reduction gear set; 25-stepping motor; 3-movable focusing ring; 31-external gear part; 32-focusing ring oblique hole; 33-inner convex part; 4-movable mirror frame; 41-second limit installation groove; 5-guide rod; 61-first magnetic attraction; 62-second magnetic attraction; 63-base magnet; 64-mirror frame magnet; 65-single magnet; 66-annular iron piece; 7-cover plate; 71-limit inner ring; 72-limit outer ring; 721-limit boss; 8-pressing ring; 81-limit convex part. DETAILED DESCRIPTION

[0039] The present invention is described below in conjunction with specific implementation methods.

[0040] Embodiment 1, as Figures 1 to 7 As shown, a new AF focusing module includes a fixed base 1, a focusing drive component 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, and the core of the base cylindrical portion 11 is provided with a base light-through hole 12 which is vertically penetrated and in the shape of a circular hole. The movable focusing ring 3 is rotatably sleeved on the outer periphery of the base cylindrical portion 11, and the movable lens frame 4 is movably embedded in the base light-through hole 12, and a magnetic suction component is installed between the fixed base 1 and the movable lens frame 4.

[0041] Among them, Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 as well as Figure 7As shown, the focusing drive assembly 2 includes a stepping reduction motor 21 which is screwed and fastened to the fixed base 1 and is located beside the base cylindrical portion 11, and the output end of the stepping reduction motor 21 is an output gear 22; the movable focusing ring 3 is provided with an external gear portion 31, and the output gear 22 of the stepping reduction motor 21 is meshed with the external gear portion 31 of the movable focusing ring 3.

[0042] Further, such as Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 as well as Figure 7 As shown, the outer wall of the movable mirror frame 4 is screwed with at least two guide rods 5 which protrude radially outward, the base cylindrical portion 11 is respectively provided with vertically extending base guide long holes 13 corresponding to each guide rod 5, the movable focusing ring 3 is respectively provided with obliquely extending focusing ring inclined holes 32 corresponding to each guide rod 5, and the outer end portion of each guide rod 5 passes through the corresponding base guide long hole 13 and is inserted into the corresponding focusing ring inclined hole 32.

[0043] Furthermore, Figure 2 , Figure 3 , Figure 5 as well as Figure 7 As shown, the inner wall of the light hole 12 of the base is equipped with a first magnetic component 61, and the outer wall of the movable mirror frame 4 is equipped with a second magnetic component 62, and the first magnetic component 61 and the second magnetic component 62 are staggered in the Z-axis direction, and the first magnetic component 61 and the second magnetic component 62 together constitute a magnetic component; the magnetic force of the first magnetic component 61 on the second magnetic component 62 causes the movable mirror frame 4 to be subjected to the combined action of radial retaining force and axial retaining force.

[0044] In addition, if Figure 2 , Figure 3 , Figure 5 as well as Figure 7 As shown, the inner wall of the base light hole 12 is provided with a first limiting mounting groove 14 corresponding to the first magnetic component 61, and the first magnetic component 61 is fixedly installed in the first limiting mounting groove 14 by glue; the outer wall of the movable mirror frame 4 is provided with a second limiting mounting groove 41 corresponding to the second magnetic component 62, and the second magnetic component 62 is fixedly installed in the second limiting mounting groove 41 by glue.

[0045] Specifically, Figures 1 to 3As shown, the first magnetic attraction component 61 includes a plurality of base magnets 63 distributed in a circular array with the axis of the base light-through hole 12 as the center, and each base magnet 63 is respectively fastened and installed on the inner wall of the base light-through hole 12; the second magnetic attraction component 62 includes a plurality of frame magnets 64 distributed in a circular array with the axis of the movable frame 4 as the center, and each frame magnet 64 is respectively fastened and installed on the outer wall of the movable frame 4; the number of the base magnets 63 is consistent with the number of the frame magnets 64, and the first magnet group and the second magnet group are staggered in the Z-axis direction.

[0046] It should be explained that all base magnets 63 in the first magnetic attraction member 61 are aligned horizontally, and all frame magnets 64 in the second magnetic attraction member 62 are aligned horizontally. Figure 3 As shown, the height difference H between the center position of the first magnetic member 61 and the center position of the second magnetic member 62 is achieved so that the first magnetic member 61 and the second magnetic member 62 are staggered in the Z-axis direction. In addition, the number of the base magnets 63 is consistent with the number of the frame magnets 64, and each base magnet 63 is aligned with a frame magnet 64 in the radial direction.

[0047] It should be pointed out that the stepper reduction motor 21 includes a motor base 23 screwed and fastened to the fixed base 1, and a reduction gear set 24 is installed inside the motor base 23 through a gear shaft, and the output end gear of the reduction gear set 24 is the output gear 22; a stepper motor 25 is screwed on the upper end of the motor base 23, and the power output shaft of the stepper motor 25 is connected to the input end gear of the reduction gear set 24.

[0048] For the new AF focusing module of the first embodiment, during the process of realizing the focusing action, the stepping reduction motor 21 is activated, and at this time, the stepping motor 25 drives the output gear 22 to rotate through the reduction gear set 24, and the rotating output gear 22 drives the outer gear portion 31 of the movable focusing ring 3 to rotate, thereby causing the movable focusing ring 3 to rotate relative to the base cylindrical portion 11, and the rotating movable focusing ring 3 acts on the corresponding guide rods 5 through its focusing ring inclined holes 32 and causes each guide rod 5 to move up and down relative to the corresponding base guide long holes 13, and the guide rods 5 that move up and down relative to the base cylindrical portion 11 drive the movable lens frame 4 to move up and down synchronously, thereby realizing the focusing action.

[0049] It should be pointed out that during the working process of the first embodiment, there is a magnetic force between the first magnetic attraction member 61 and the second magnetic attraction member 62, and the 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 frame magnet 64, the 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 frame magnet 64, the magnetic force is an attractive force. Since the first magnetic attraction member 61 and the second magnetic attraction member 62 are staggered in the Z-axis direction, the magnetic force between each base magnet 63 and the corresponding frame magnet 64 can be decomposed into a radial force and an axial force. The radial force can form a radial retaining force acting on the movable frame 4, and the axial force can form an axial retaining force acting on the movable frame 4.

[0050] As for the axial holding force formed by the magnetic force of the first magnetic member 61 and the second magnetic member 62, the axial holding force can effectively ensure that the movable mirror frame 4 is axially reset to a fixed state when the external impact and shaking are eliminated, so as to avoid the axial movement and displacement of the movable mirror frame 4, thereby ensuring that the movable mirror frame 4 has no movement and no defocus in the Z-axis direction. As for the radial holding force formed by the magnetic force of 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 frame magnets 64 of the second magnetic member 62 are also distributed in a circular array, the movable mirror frame 4 will be subjected to the radial force distributed in multiple circular arrays. The above radial holding force can effectively ensure that the movable mirror frame 4 is reset to a concentric state with the base light hole 12 when the external impact and shaking are eliminated, so as to avoid the radial movement and displacement of the movable mirror frame 4, thereby ensuring that the movable mirror frame 4 has no radial movement.

[0051] For the magnetic suction component of the first embodiment of the present invention, it can make the movable lens frame 4 be subjected to the axial retaining force and the radial retaining force at the same time when in use. After the external impact and shaking are eliminated, the movable lens frame 4 has no axial and radial movement. This can effectively improve the stability and reliability of the focusing module and the high focusing accuracy. Therefore, the new AF focusing module of the first embodiment of the present invention has the advantages of novel structural design, good stability and reliability, and high focusing accuracy.

[0052] Embodiment 2, as Figure 4 and Figure 5 As shown, the first magnetic attraction member 61 includes a plurality of single magnets 65 distributed in a circular array with the axis of the base light hole 12 as the center, and each single magnet 65 is fastened to the inner wall of the base light hole 12.

[0053] The second magnetic attraction member 62 is a ring-shaped annular iron member 66 , which is sleeved and fastened to the outer wall of the movable mirror frame 4 , and the annular magnet is coaxially arranged with the movable mirror frame 4 .

[0054] For the magnetic attraction component of the second embodiment, there is a magnetic attraction between each individual magnet 65 of the first magnetic attraction component 61 and the annular iron piece 66; since the first magnetic attraction component 61 of the fixed base 1 and the annular iron piece 66 on the movable mirror frame 4 are staggered in the Z-axis direction, the magnetic attraction between each individual magnet 65 and the annular iron piece 66 can be decomposed into a radial force and an axial force. The radial force can form a radial retaining force acting on the movable mirror frame 4, and the axial force can form an axial retaining force acting on the movable mirror frame 4.

[0055] Embodiment three, as Figure 6 and Figure 7 As shown, the difference between the third embodiment and the first embodiment is that the first magnetic attraction member 61 is a ring-shaped annular iron member 66, which is fixedly mounted on the inner wall of the base light hole 12 and is coaxially arranged with the base light hole 12.

[0056] The second magnetic attraction member 62 includes a plurality of single magnets 65 distributed in a circular array with the axis of the movable mirror frame 4 as the center, and each single magnet 65 is fastened to the outer side wall of the movable mirror frame 4 .

[0057] For the magnetic attraction component of the third embodiment, there is a magnetic attraction between each individual magnet 65 of the second magnetic attraction component 62 and the annular iron piece 66; since the second magnetic attraction component 62 of the movable mirror frame 4 and the annular iron piece 66 on the fixed base 1 are staggered in the Z-axis direction, the magnetic attraction between each individual magnet 65 and the annular iron piece 66 can be decomposed into a radial force and an axial force. The radial force can form a radial retaining force acting on the movable mirror frame 4, and the axial force can form an axial retaining force acting on the movable mirror frame 4.

[0058] Embodiment 4, as Figure 4 and Figure 5 As shown, the difference between the fourth embodiment and the first embodiment is that a plurality of inwardly protruding inner convex portions 33 are provided on the upper edge of the movable focusing ring 3, a ring-shaped annular groove 15 is provided on the upper end of the outer wall of the base cylindrical portion 11, and a space-avoiding groove 16 which opens upward and is connected to the annular groove 15 at the lower end is provided on the outer wall of the base cylindrical portion 11 corresponding to each of the inward convex portions 33.

[0059] The inner convex parts 33 of the movable focus ring 3 are respectively inserted into the annular groove 15 through the corresponding escape grooves 16 .

[0060] When the focus driving assembly 2 drives the movable focus ring 3 to rotate, each inner convex portion 33 of the movable focus ring 3 rotates along the annular groove 15 , and the annular groove 15 can realize vertical limiting of the movable focus ring 3 .

[0061] Embodiment 5, as Figures 1 to 3As shown, the difference between the fifth embodiment and the first embodiment is that a cover plate 7 is screwed onto the upper end of the cylindrical portion 11 of the base, and the cover plate 7 is provided with a limiting inner ring 71 located in the light-through hole 12 of the base and a limiting outer ring 72 located outside the cylindrical portion 11 of the base, and the limiting inner ring 71 is located above the first magnetic attraction component 61.

[0062] The lower surface of the limiting outer ring 72 is provided with a limiting boss 721 protruding downward, and the limiting boss 721 contacts the upper surface of the movable focusing ring 3 .

[0063] The limiting outer ring 72 limits the upper part of the movable focus ring 3 through the limiting boss 721 . The limiting outer ring 72 cooperates with the fixed base 1 and enables the movable focus ring 3 to stably rotate and sleeve on the outer periphery of the base cylindrical portion 11 .

[0064] 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, so as to improve the smoothness of the rotation of the movable focusing ring 3.

[0065] The limiting inner ring 71 is located in the base light hole 12 and above the first magnetic component 61 . The limiting inner ring 71 can limit the first magnetic component 61 to ensure that the first magnetic component 61 is stably and reliably installed on the inner wall of the base light hole 12 .

[0066] Embodiment six, as Figure 6 and Figure 7 As shown, the difference between the sixth embodiment and the first embodiment is that a ring-shaped pressing ring 8 is screwed or fastened on the upper end of the base cylindrical portion 11 , and the pressing ring 8 is located in the base light hole 12 and above the first magnetic attraction member 61 .

[0067] The edge of the pressure ring 8 is provided with a limiting protrusion 81 protruding and extending to the outside of the base cylindrical portion 11 , and the limiting protrusion 81 contacts the upper surface of the movable focus ring 3 .

[0068] It should be explained that the pressing ring 8 is located in the base light-through hole 12 and above the first magnetic component 61 . The pressing ring 8 can limit the first magnetic component 61 to ensure that the first magnetic component 61 is stably and reliably installed on the inner wall of the base light-through hole 12 .

[0069] The limiting protrusion 81 of the pressing ring 8 contacts the upper surface of the movable focus ring 3 , and the limiting protrusion 81 can limit the movable focus ring 3 so that the movable focus ring 3 can be stably rotated and sleeved on the outer periphery of the base cylindrical portion 11 .

[0070] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A novel AF focusing module, comprising a fixed base (1), a focusing drive assembly (2), a movable focusing ring (3), and a movable lens frame (4), wherein the fixed base (1) is provided with a base cylindrical portion (11) in a cylindrical shape, a base light-through hole (12) which is vertically penetrated and in the shape of a circular hole is opened in the core of the base cylindrical portion (11), the movable focusing ring (3) is rotatably sleeved on the outer periphery of the base cylindrical portion (11), the movable lens frame (4) is movably embedded in the base light-through hole (12), and a magnetic attraction assembly is installed between the fixed base (1) and the movable lens frame (4); The focus drive assembly (2) comprises a stepping reduction motor (21) which is screwed and fastened to the fixed base (1) and is located beside the base cylindrical portion (11); the output end of the stepping reduction motor (21) is an output gear (22); the movable focus ring (3) is provided with an external gear portion (31); the output gear (22) of the stepping reduction motor (21) is meshed with the external gear portion (31) of the movable focus ring (3); The outer wall of the movable lens frame (4) is screwed with at least two guide rods (5) which protrude radially outwards, respectively; the base cylindrical portion (11) is provided with a base guide long hole (13) extending vertically corresponding to each guide rod (5); the movable focus ring (3) is provided with a focus ring inclined hole (32) extending obliquely corresponding to each guide rod (5); the outer end of each guide rod (5) passes through the corresponding base guide long hole (13) and is inserted into the corresponding focus ring inclined hole (32); Features: A first magnetic attraction component (61) is installed on the inner wall of the light-through hole (12) of the base, and a second magnetic attraction component (62) is installed on the outer wall of the movable mirror frame (4), and the first magnetic attraction component (61) and the second magnetic attraction component (62) are arranged in a staggered manner in the Z-axis direction, and the first magnetic attraction component (61) and the second magnetic attraction component (62) together constitute the magnetic attraction component; The inner wall of the light-through hole (12) of the base is provided with a first position-limiting installation groove (14) corresponding to the first magnetic attraction component (61), and the first magnetic attraction component (61) is fixedly installed in the first position-limiting installation groove (14) by glue. The outer wall of the movable mirror frame (4) is provided with a second position-limiting installation groove (41) corresponding to the second magnetic attraction component (62), and the second magnetic attraction component (62) is fixedly installed in the second position-limiting installation groove (41) by glue. The magnetic force of the first magnetic attraction member (61) on the second magnetic attraction member (62) causes the movable mirror frame (4) to be subjected to the combined effects of radial retaining force and axial retaining force.

2. A novel AF focusing module according to claim 1, characterized in that: The first magnetic attraction member (61) comprises a plurality of base magnets (63) distributed in a circular array with the axis of the base light-through hole (12) as the center, and each base magnet (63) is respectively fixedly mounted on the inner wall of the base light-through hole (12); The second magnetic attraction member (62) comprises a plurality of frame magnets (64) distributed in a circular array with the axis of the movable frame (4) as the center, and each frame magnet (64) is respectively fixedly mounted on the outer wall of the movable frame (4); the number of the base magnets (63) is consistent with the number of the frame magnets (64), and the first magnet group and the second magnet group are staggered in the Z-axis direction.

3. A novel AF focusing module according to claim 1, characterized in that: The first magnetic attraction member (61) comprises a plurality of single magnets (65) distributed in a circular array with the axis of the base light-through hole (12) as the center, and each single magnet (65) is respectively fixedly mounted on the inner wall of the base light-through hole (12); The second magnetic attraction member (62) is an annular iron member (66) in the shape of a circular ring. The annular iron member (66) is sleeved and fastened to the outer wall of the movable mirror frame (4), and the annular magnet is coaxially arranged with the movable mirror frame (4).

4. The novel AF focusing module according to claim 1, characterized in that: The first magnetic attraction member (61) is a ring-shaped annular iron member (66), the annular iron member (66) being fixedly mounted on the inner wall of the base light-through hole (12), and the annular iron member (66) and the base light-through hole (12) being coaxially arranged; The second magnetic attraction member (62) comprises a plurality of single magnets (65) distributed in a circular array with the axis of the movable mirror frame (4) as the center, and each single magnet (65) is respectively fixedly mounted on the outer side wall of the movable mirror frame (4).

5. The novel AF focusing module according to claim 1, characterized in that: The upper edge of the movable focus ring (3) is provided with a plurality of inwardly protruding inner convex portions (33); the upper end of the outer wall of the base cylindrical portion (11) is provided with an annular groove (15) in the shape of a circular ring; and the outer wall of the base cylindrical portion (11) is provided with a space-avoiding groove (16) corresponding to each of the inwardly protruding portions (33) and opening upward and communicating with the annular groove (15) at the lower end; Each inner convex portion (33) of the movable focus ring (3) is inserted into the annular groove (15) through the corresponding air avoidance groove (16).

6. A novel AF focusing module according to claim 1, characterized in that: A cover plate (7) is screwed onto the upper end of the base cylindrical portion (11); the cover plate (7) is provided with a limiting inner ring (71) located inside the base light-through 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 attraction member (61); The lower surface of the limiting outer ring (72) is provided with a limiting boss (721) protruding downwards, and the limiting boss (721) is in contact with the upper surface of the movable focus ring (3).

7. A novel AF focusing module according to claim 1, characterized in that: A ring-shaped pressing ring (8) is screwed or buckled onto the upper end of the base cylindrical portion (11); the pressing ring (8) is located in the base light-through hole (12) and above the first magnetic attraction member (61); The edge of the pressure ring (8) is provided with a limiting convex portion (81) protruding and extending to the outside of the base cylindrical portion (11), and the limiting convex portion (81) contacts the upper surface of the movable focus ring (3).

8. The novel AF focusing module according to claim 1, characterized in that: The stepping reduction motor (21) comprises a motor base (23) screwed and fastened to the fixed base (1), a reduction gear set (24) is installed inside the motor base (23) via a gear shaft, and the output end gear of the reduction gear set (24) is the output gear (22); A stepper motor (25) is screwed onto the upper end of the motor seat (23), and a power output shaft of the stepper motor (25) is connected to an input end gear of the reduction gear set (24).

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