Magnetic suspension type automatic focusing module

Abstract

The invention discloses a magnetic suspension type automatic focusing module, which comprises a fixed base, a stepping gear motor, a movable focusing ring and a movable mirror frame, and is characterized in that the movable focusing ring sleeves the periphery of a cylinder part of the base, and the movable mirror frame is movably embedded in a light through hole of the base; the stepping gear motor comprises a motor base, a reduction gear set and a stepping motor, and an output end gear of the reduction gear set is meshed with the outer gear part of the movable focusing ring; the movable mirror frame is provided with a guide column, the guide column and the movable mirror frame are of an integrated structure through injection molding, and the outer end of the guide column penetrates through the vertical through groove and extends into the spiral groove. The magnetic attraction assembly comprises a first magnetic attraction piece arranged on the inner wall of the light through hole of the base and a second magnetic attraction piece arranged on the outer side wall of the movable mirror frame, 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 radial and axial retention force under the magnetic action of the first magnetic attraction piece and the second magnetic attraction piece. The magnetic suspension type automatic 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 invention relates to the technical field of optical devices, and in particular to a magnetic suspension type automatic focusing module. Background Art

[0002] The patent number is: ZL202123135119.4, and the patent name is: A Chinese utility model patent for a detachable automatic focusing MTV lens module, which essentially discloses an automatic focusing module; specifically, the detachable automatic focusing MTV lens module includes a fixed base, a fixed sleeve connected to the fixed base, a movable frame and a compression spring located on the upper end side of the movable frame are embedded in the sleeve accommodating cavity of the core of the fixed sleeve, and a fixed cover plate is screwed and fastened on the upper end face of the fixed sleeve, and the upper and lower ends of the compression spring are respectively abutted against the fixed cover plate and the movable frame on the corresponding sides; the movable frame is provided with a frame boss extending radially outward, the frame boss and the movable frame are an integral structure, and the fixed sleeve is provided with a sleeve vertical through groove corresponding to the frame boss, which completely penetrates radially and extends vertically; the outer periphery of the fixed sleeve is provided with a circular ring-shaped sleeve. The outer adjusting ring is shaped like a circle, and a spiral groove extending in a spiral direction is provided on the inner circumference of the outer adjusting ring corresponding to the lens frame boss, and the outer end of the lens frame boss passes through the vertical through groove of the sleeve and the outer end of the lens frame boss is embedded in the spiral groove; a reduction motor assembly is installed on the fixed base beside the outer adjusting ring, and the reduction motor assembly is drivingly connected to the outer adjusting ring; the reduction motor assembly includes a reduction box housing which is screwed and fastened to the upper surface of the fixed base, and a reduction box accommodating cavity which is open to the side of the outer adjusting ring is formed inside the reduction box housing, a reduction gear set is embedded in the reduction box accommodating cavity, and a stepping motor is screwed and fastened to the outer surface of the reduction box housing; the outer adjusting ring is provided with an external gear part, and the external gear part and the outer adjusting ring are an integrated structure, the input end gear of the reduction gear set is installed on the power output shaft of the stepping motor, and the output end gear of the reduction gear set is meshed with the external gear part of the outer adjusting ring.

[0003] In the process of realizing the focusing action of the above-mentioned detachable automatic focusing MTV lens module, the stepping motor drives the outer gear part of the outer adjusting ring through the reduction gear set, so that the outer adjusting ring rotates relative to the fixed sleeve; in the process of the outer adjusting ring rotating relative to the fixed sleeve, the outer adjusting ring drives the frame boss of the movable frame to move up and down through the spiral groove, thereby causing the movable frame to move up and down relative to the fixed sleeve, so as to realize the up and down movement of the camera lens, and then perform the focusing action.

[0004] It should be pointed out that the above-mentioned detachable automatic focusing MTV lens module has the following defects, specifically:

[0005] Defect 1. The compression spring keeps pressing the movable frame downward. When the external impact and shaking are eliminated, the elastic force of the compression spring will reset the movable frame to a fixed state, so as to achieve the function of no movement and no out-of-focus on the Z-axis of the movable frame. However, because the movable frame has no radial retaining force and the movable frame is movably installed in the sleeve accommodating cavity of the fixed sleeve, there is inevitably a radial gap between the movable frame and the fixed sleeve. In the absence of radial retaining force, when the movable frame shakes due to external impact, the movable frame will have the problem of radial movement. When the external impact and shaking are eliminated, the movable frame still will not reset to a state concentric with the light hole, and its stability, reliability and accuracy of use are poor. Summary of the invention

[0006] The object of the present invention is to provide a magnetic suspension type automatic focusing module in view of the deficiencies in the prior art. The magnetic suspension type automatic focusing module has a novel structural design, good stability and reliability, and high focusing accuracy.

[0007] To achieve the above object, the present invention is implemented through the following technical solutions.

[0008] A magnetic suspension type automatic focusing module comprises a fixed base, a stepping reduction motor, a movable focusing ring, and a movable mirror frame, wherein the fixed base is provided with a base cylindrical portion in a cylindrical shape, a base light-through hole which is vertically penetrated and in the shape of a circular hole is opened at the core of the base cylindrical portion, the movable focusing ring is sleeved on the outer periphery of the base cylindrical portion, and the movable mirror frame is movably embedded in the base light-through hole;

[0009] The stepping reduction motor includes a motor seat screwed on a fixed base and located beside the cylindrical portion of the base, a reduction gear set is installed inside the motor seat through a gear shaft, a stepping motor is screwed on the upper end of the motor seat, and the power output shaft of the stepping motor is connected to the input end gear of the reduction gear set; the movable focus ring is provided with an external gear portion, and the output end gear of the reduction gear set is meshed with the external gear portion of the movable focus ring;

[0010] The movable lens frame is provided with a guide post which protrudes radially outwards, and the guide post and the movable lens frame are injection-molded into an integral structure. A vertical through groove which penetrates radially and opens upwards is provided on the cylindrical portion of the base corresponding to the guide post of the movable lens frame, and a spiral groove which extends spirally and opens upwards is provided on the inner circumference of the movable focusing ring corresponding to the guide post of the movable lens frame, and the outer end of the guide post passes through the vertical through groove and extends into the spiral groove;

[0011] A magnetic attraction component is installed between the fixed base and the movable mirror frame, and the magnetic attraction component includes a first magnetic attraction component installed on the inner wall of the light hole of the base and a second magnetic attraction component installed on the outer wall of the movable mirror frame. The first magnetic attraction component and the second magnetic attraction component are staggered in the Z-axis direction.

[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, a first position-limiting installation groove is provided on the inner wall of the light-through hole of the base corresponding to the first magnetic attraction component, and the first magnetic attraction component is fixedly installed in the first position-limiting installation groove by glue spotting;

[0014] A second position-limiting installation groove is formed on the outer side wall of the movable mirror frame corresponding to the second magnetic attraction component, and the second magnetic attraction component is fixedly installed in the second position-limiting installation groove by glue.

[0015] 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;

[0016] 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.

[0017] 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;

[0018] 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.

[0019] 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;

[0020] 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.

[0021] Wherein, a cover plate is screwed on the upper end of the cylindrical portion of the base, and the cover plate is provided with a focus ring limiter which protrudes downward and contacts the upper surface of the movable focus ring;

[0022] The cover plate is also provided with a magnetic component pressing platform located in the light-through hole of the base, and the magnetic component pressing platform is in contact with the upper surface of the first magnetic component.

[0023] Among them, a circular ring-shaped pressure ring is installed at the upper end of the cylindrical part of the base, the inner edge of the pressure ring contacts the upper surface of the first magnetic attraction part, and the outer edge of the pressure ring contacts the upper surface of the movable focusing ring.

[0024] The pressure ring is provided with a plurality of arc-shaped through holes arranged in a circular array, and the upper end of the cylindrical portion of the base is provided with upwardly protruding connecting convex portions corresponding to each arc-shaped through hole, and each connecting convex portion is inserted into the corresponding arc-shaped through hole;

[0025] The upper opening positions of the arc-shaped through holes are respectively formed with glue dispensing grooves, and the pressing ring is fastened to the connecting protrusion by glue dispensing.

[0026] Compared with the prior art, the present invention has the following beneficial effects, specifically: 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 the radial holding force and the axial holding force, and 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 concentric state 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 the axial holding force and the radial holding force when in use, and 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 magnetic suspension automatic 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

[0027] 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.

[0028] Figure 1 It is a schematic diagram of the structure of the present invention.

[0029] Figure 2 for Figure 1 Schematic diagram of the decomposition.

[0030] Figure 3 It is a cross-sectional schematic diagram of the present invention.

[0031] Figure 4 It is a structural schematic diagram of another embodiment of the magnetic attraction component of the present invention.

[0032] Figure 5 It is a structural schematic diagram of another embodiment of the magnetic attraction component of the present invention.

[0033] Figure 6 It is a structural schematic diagram of another embodiment of the present invention.

[0034] Figure 7It is a structural schematic diagram of the cover plate of the present invention.

[0035] exist Figures 1 to 7 Included are:

[0036] 1-fixed base; 11-cylindrical part of base; 12-light hole of base; 13-vertical through groove; 14-first limit mounting groove; 15-connecting convex part; 2-stepping reduction motor; 21-motor seat; 22-reduction gear set; 221-output end gear; 23-stepping motor; 3-movable focusing ring; 31-external gear part; 32-spiral groove; 4-movable mirror frame; 41-guide column; 42-second limit mounting groove; 51-first magnetic attraction; 52-second magnetic attraction; 53-base magnet; 54-mirror frame magnet; 55-single magnet; 56-ring iron piece; 6-cover plate; 61-focusing ring limit table; 62-magnetic attraction pressing table; 7-pressing ring; 71-arc through hole; 72-glue dispensing groove. DETAILED DESCRIPTION

[0037] The present invention is described below in conjunction with specific implementation methods.

[0038] Embodiment 1, as Figures 1 to 6 As shown, a magnetic suspension automatic focusing module includes a fixed base 1, a stepping reduction motor 2, a movable focusing ring 3, and a movable mirror 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 sleeved on the outer periphery of the base cylindrical portion 11, and the movable mirror frame 4 is movably embedded in the base light-through hole 12.

[0039] Among them, Figure 1 , Figure 2 as well as Figure 5 As shown, the stepping reduction motor 2 includes a motor base 21 which is screwed on the fixed base 1 and located beside the base cylindrical portion 11. A reduction gear set 22 is installed inside the motor base 21 through a gear shaft. A stepping motor 23 is screwed on the upper end of the motor base 21. The power output shaft of the stepping motor 23 is connected to the input end gear of the reduction gear set 22; the movable focusing ring 3 is provided with an external gear portion 31, and the output end gear 221 of the reduction gear set 22 is meshed with the external gear portion 31 of the movable focusing ring 3.

[0040] Further, such as Figures 2 to 5As shown, the movable lens frame 4 is provided with a guide column 41 which protrudes radially outward, and the guide column 41 and the movable lens frame 4 are injection molded into an integral structure. The cylindrical portion 11 of the base is provided with a vertical through groove 13 which penetrates radially and opens upward corresponding to the guide column 41 of the movable lens frame 4. The inner circumferential surface of the movable focusing ring 3 is provided with a spiral groove 32 which extends spirally and opens upward corresponding to the guide column 41 of the movable lens frame 4. The outer end portion of the guide column 41 passes through the vertical through groove 13 and extends into the spiral groove 32.

[0041] Furthermore, Figures 2 to 5 As shown, a magnetic attraction component is installed between the fixed base 1 and the movable mirror frame 4, and the magnetic attraction component includes a first magnetic attraction component 51 installed on the inner wall of the base light hole 12, and a second magnetic attraction component 52 installed on the outer wall of the movable mirror frame 4. The first magnetic attraction component 51 and the second magnetic attraction component 52 are staggered in the Z-axis direction; the magnetic force of the first magnetic attraction component 51 on the second magnetic attraction component 52 causes the movable mirror frame 4 to be subjected to the combined action of radial retaining force and axial retaining force.

[0042] It should be pointed out that the first magnetic component 51 and the second magnetic component 52 can be fastened and installed on the corresponding inner wall of the base cylindrical portion 11 and the outer wall of the movable mirror frame 4 respectively in the following ways. Specifically: a first limiting mounting groove 14 is opened on the inner wall of the base light hole 12 corresponding to the first magnetic component 51, and the first magnetic component 51 is fixedly installed in the first limiting mounting groove 14 by glue; a second limiting mounting groove 42 is opened on the outer wall of the movable mirror frame 4 corresponding to the second magnetic component 52, and the second magnetic component 52 is fixedly installed in the second limiting mounting groove 42 by glue.

[0043] Specifically, Figure 2 and Figure 3 As shown, the first magnetic attraction component 51 includes a plurality of base magnets 53 distributed in a circular array with the axis of the base light-through hole 12 as the center, and each base magnet 53 is respectively fastened and installed on the inner wall of the base light-through hole 12; the second magnetic attraction component 52 includes a plurality of frame magnets 54 distributed in a circular array with the axis of the movable frame 4 as the center, and each frame magnet 54 is respectively fastened and installed on the outer wall of the movable frame 4; the number of the base magnets 53 is consistent with the number of the frame magnets 54, and the first magnet group and the second magnet group are staggered in the Z-axis direction.

[0044] It should be explained that all base magnets 53 in the first magnetic attraction member 51 are aligned horizontally, and all frame magnets 54 in the second magnetic attraction member 52 are aligned horizontally. Figure 3 As shown, the height difference H between the center position of the first magnetic member 51 and the center position of the second magnetic member 52 is achieved so that the first magnetic member 51 and the second magnetic member 52 are staggered in the Z-axis direction. In addition, the number of the base magnets 53 is consistent with the number of the frame magnets 54, and each base magnet 53 is aligned with a frame magnet 54 in the radial direction.

[0045] For the magnetic levitation automatic focusing module of the first embodiment, during the process of realizing the focusing action, the stepping reduction motor 2 is activated, and at this time, the stepping motor 23 drives the outer gear portion 31 of the movable focusing ring 3 to rotate through the output end gear 221 of the reduction gear group 22, 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 guide column 41 through its spiral groove 32 and causes the guide column 41 to move up and down relative to the vertical through groove 13 of the base cylindrical portion 11, and the vertical channel guides the guide column 41 to move up and down, and the guide column 41 that moves up and down relative to the base cylindrical portion 11 drives the movable mirror frame 4 to move up and down synchronously, thereby realizing the focusing action.

[0046] 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 51 and the second magnetic attraction member 52, and the magnetic force can be an attractive force or a repulsive force; when the polarity of the inner surface of the base magnet 53 is the same as the polarity of the outer surface of the frame magnet 54, the magnetic force is a repulsive force; when the polarity of the inner surface of the base magnet 53 is opposite to the polarity of the outer surface of the frame magnet 54, the magnetic force is an attractive force. Since the first magnetic attraction member 51 and the second magnetic attraction member 52 are staggered in the Z-axis direction, the magnetic force between each base magnet 53 and the corresponding frame magnet 54 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.

[0047] As for the axial holding force formed by the magnetic force of the first magnetic member 51 and the second magnetic member 52, 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 51 and the second magnetic member 52, since the multiple base magnets 53 of the first magnetic member 51 are distributed in an annular array and the multiple frame magnets 54 of the second magnetic member 52 are also distributed in an annular array, the movable mirror frame 4 will be subjected to the radial force distributed in multiple annular arrays, and the above radial holding force makes the movable mirror frame 4 in a magnetic suspension state, and 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.

[0048] For the magnetic suction component of the first embodiment of the present invention, it can make the movable mirror frame 4 be subjected to the axial holding force and the radial holding force at the same time when in use. After the external impact and shaking are eliminated, the movable mirror 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 magnetic levitation automatic 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.

[0049] Embodiment 2, as Figure 4 As shown, the difference between the second embodiment and the first embodiment is that the first magnetic attraction member 51 includes a plurality of single magnets 55 distributed in a circular array with the axis of the base light hole 12 as the center, and each single magnet 55 is fastened to the inner wall of the base light hole 12.

[0050] The second magnetic attraction member 52 is a ring-shaped annular iron member 56 , 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 .

[0051] For the magnetic attraction component of the second embodiment, there is a magnetic attraction between each individual magnet 55 of the first magnetic attraction component 51 and the annular iron piece 56; since the first magnetic attraction component 51 of the fixed base 1 and the annular iron piece 56 on the movable mirror frame 4 are staggered in the Z-axis direction, the magnetic attraction between each individual magnet 55 and the annular iron piece 56 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.

[0052] Embodiment three, as Figure 5 As shown, the difference between the third embodiment and the first embodiment is that the first magnetic attraction member 51 is a ring-shaped annular iron member 56 , which is fixedly mounted on the inner wall of the base light-through hole 12 and is coaxially arranged with the base light-through hole 12 .

[0053] The second magnetic attraction member 52 includes a plurality of single magnets 55 distributed in a circular array with the axis of the movable mirror frame 4 as the center, and each single magnet 55 is fastened to the outer side wall of the movable mirror frame 4 .

[0054] For the magnetic attraction component of the third embodiment, there is a magnetic attraction between each individual magnet 55 of the second magnetic attraction component 52 and the annular iron piece 56; since the second magnetic attraction component 52 of the movable mirror frame 4 and the annular iron piece 56 on the fixed base 1 are staggered in the Z-axis direction, the magnetic attraction between each individual magnet 55 and the annular iron piece 56 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 4, as Figure 1 , Figure 2 , Figure 3 as well as Figure 7 As shown, the difference between the fourth embodiment and the first embodiment is that a cover plate 6 is screwed onto the upper end of the base cylindrical portion 11 , and the cover plate 6 is provided with a focus ring limiter which protrudes downward and contacts the upper surface of the movable focus ring 3 .

[0056] The cover plate 6 is further provided with a magnetic component pressing platform 62 located in the light-through hole 12 of the base, and the magnetic component pressing platform 62 is in contact with the upper surface of the first magnetic component 51 .

[0057] The cover plate 6 limits the upper surface of the movable focus ring 3 through the focus ring limiter, and the focus ring limiter cooperates with the fixed base 1 to enable the movable focus ring 3 to stably rotate and sleeve on the periphery of the base cylinder 11 .

[0058] It should be explained that the magnetic component pressing platform 62 is located in the base light hole 12 and the magnetic component pressing platform 62 is located above the first magnetic component 51. The magnetic component pressing platform 62 can limit the first magnetic component 51 to ensure that the first magnetic component 51 is stably and reliably installed on the inner wall of the base light hole 12.

[0059] Embodiment 5, as Figure 6 As shown, the difference between the fifth embodiment and the first embodiment is that a ring-shaped pressure ring 7 is installed at the upper end of the base cylindrical portion 11, the inner edge of the pressure ring 7 contacts the upper surface of the first magnetic attraction member 51, and the outer edge of the pressure ring 7 contacts the upper surface of the movable focusing ring 3.

[0060] Specifically, the pressing ring 7 is provided with a plurality of arc-shaped through holes 71 arranged in a circular array, and the upper end portion of the base cylindrical portion 11 is provided with a connecting protrusion 15 protruding upward corresponding to each arc-shaped through hole 71, and each connecting protrusion 15 is inserted into the corresponding arc-shaped through hole 71; a glue dispensing groove 72 is formed at the upper opening position of each arc-shaped through hole 71, and the pressing ring 7 is fastened to the connecting protrusion 15 by glue dispensing.

[0061] The outer edge of the pressing ring 7 limits the upper surface of the movable focus ring 3 , and the outer edge of the pressing ring 7 cooperates with the fixed base 1 to enable the movable focus ring 3 to stably rotate and sleeve on the periphery of the base cylindrical portion 11 .

[0062] It should be explained that the inner edge of the pressing ring 7 extends into the light-through hole 12 of the base, and the inner edge of the pressing ring 7 is located above the first magnetic component 51. The inner edge of the pressing ring 7 can limit the first magnetic component 51 to ensure that the first magnetic component 51 is stably and reliably installed on the inner wall of the light-through hole 12 of the base.

[0063] For the glue dispensing groove 72 opened at the upper end opening position of the arc-shaped through hole 71, when the pressure ring 7 is connected to the connecting boss by glue dispensing, the glue dispensing groove 72 can improve the stability of the glue dispensing operation and improve the bonding strength between the two.

[0064] 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 magnetic levitation automatic focusing module, comprising a fixed base (1), a stepping reduction motor (2), a movable focusing ring (3), and a movable mirror frame (4), wherein the fixed base (1) is provided with a cylindrical base cylindrical portion (11), a core portion of the base cylindrical portion (11) is provided with a base light hole (12) which is vertically penetrated and has a circular hole shape, the movable focusing ring (3) is sleeved on the outer periphery of the base cylindrical portion (11), and the movable mirror frame (4) is movably embedded in the base light hole (12); The stepping reduction motor (2) includes a motor base (21) screwed onto the fixed base (1) and located beside the base cylindrical portion (11); a reduction gear set (22) is installed inside the motor base (21) via a gear shaft; a stepping motor (23) is screwed onto the upper end of the motor base (21); a power output shaft of the stepping motor (23) is connected to an input end gear of the reduction gear set (22); a movable focus ring (3) is provided with an external gear portion (31); an output end gear (221) of the reduction gear set (22) is meshed with the external gear portion (31) of the movable focus ring (3); The movable lens frame (4) is provided with a guide post (41) that protrudes radially outward and is injection-molded with the movable lens frame (4) to form an integral structure. The cylindrical portion of the base (11) is provided with a vertical through groove (13) that radially penetrates and opens upward, corresponding to the guide post (41) of the movable lens frame (4). The inner circumference of the movable focusing ring (3) is provided with a spiral groove (32) that spirally extends and opens upward, corresponding to the guide post (41) of the movable lens frame (4). The outer end portion of the guide post (41) passes through the vertical through groove (13) and extends into the spiral groove (32). Its characteristics are: A magnetic attraction component is installed between the fixed base (1) and the movable mirror frame (4), and the magnetic attraction component includes a first magnetic attraction component (51) installed on the inner wall of the base light hole (12), and a second magnetic attraction component (52) installed on the outer wall of the movable mirror frame (4), and the first magnetic attraction component (51) and the second magnetic attraction component (52) are staggered in the Z-axis direction; The magnetic force of the first magnetic attraction member (51) on the second magnetic attraction member (52) causes the movable mirror frame (4) to be subjected to the combined action of radial retaining force and axial retaining force.

2. The magnetic levitation automatic focusing module according to claim 1, characterized in that: A first position-limiting mounting groove (14) is provided on the inner wall of the light-through hole (12) of the base, corresponding to the first magnetic attraction component (51), and the first magnetic attraction component (51) is fixedly mounted in the first position-limiting mounting groove (14) by glue. A second position-limiting installation groove (42) is provided on the outer side wall of the movable mirror frame (4) corresponding to the second magnetic attraction member (52), and the second magnetic attraction member (52) is fixedly installed in the second position-limiting installation groove (42) by glue.

3. The magnetic levitation automatic focusing module according to claim 1, characterized in that: The first magnetic attraction member (51) includes a plurality of base magnets (53) distributed in a circular array with the axis of the base light hole (12) as the center, and each base magnet (53) is respectively fixedly mounted on the inner wall of the base light hole (12); The second magnetic attraction member (52) includes a plurality of frame magnets (54) distributed in a circular array with the axis of the movable frame (4) as the center, and each frame magnet (54) is fastened to the outer wall of the movable frame (4). The number of the base magnets (53) is consistent with the number of the frame magnets (54), and the first magnet group and the second magnet group are staggered in the Z-axis direction.

4. The magnetic levitation automatic focusing module according to claim 1, characterized in that: The first magnetic attraction member (51) includes a plurality of single magnets (55) distributed in a circular array with the axis of the base light hole (12) as the center, and each single magnet (55) is respectively fixedly mounted on the inner wall of the base light hole (12); The second magnetic attraction member (52) is a ring-shaped annular iron member (56), the annular iron member (56) is sleeved and fastened to the outer side wall of the movable mirror frame (4), and the annular magnet is coaxially arranged with the movable mirror frame (4).

5. The magnetic levitation automatic focusing module according to claim 1, characterized in that: The first magnetic attraction member (51) is a ring-shaped annular iron member (56), the annular iron member (56) is fixedly mounted on the inner wall of the base light hole (12), and the annular iron member (56) and the base light hole (12) are coaxially arranged; The second magnetic attraction member (52) includes a plurality of single magnets (55) distributed in a circular array with the axis of the movable mirror frame (4) as the center, and each single magnet (55) is respectively fixedly mounted on the outer side wall of the movable mirror frame (4).

6. The magnetic levitation automatic focusing module according to claim 1, characterized in that: A cover plate (6) is screwed onto the upper end of the base cylindrical portion (11), and the cover plate (6) is provided with a focus ring limiter that protrudes downward and contacts the upper surface of the movable focus ring (3); The cover plate (6) is further provided with a magnetic component pressing platform (62) located in the light-through hole (12) of the base, and the magnetic component pressing platform (62) is in contact with the upper surface of the first magnetic component (51).

7. The magnetic levitation automatic focusing module according to claim 1, characterized in that: A ring-shaped pressing ring (7) is installed at the upper end of the base cylindrical portion (11), the inner edge of the pressing ring (7) contacts the upper surface of the first magnetic attraction member (51), and the outer edge of the pressing ring (7) contacts the upper surface of the movable focusing ring (3).

8. The magnetic levitation automatic focusing module according to claim 1, characterized in that: The pressing ring (7) is provided with a plurality of arc-shaped through holes (71) arranged in a circular array, and the upper end portion of the base cylindrical portion (11) is provided with a connecting protrusion (15) protruding upwards corresponding to each arc-shaped through hole (71), and each connecting protrusion (15) is inserted into the corresponding arc-shaped through hole (71); A glue-dispensing groove (72) is formed at the upper opening position of each arc-shaped through hole (71), and the pressing ring (7) is fastened to the connecting protrusion (15) by glue-dispensing.

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