Sliding shaft type VCM motor

Abstract

The invention relates to the technical field of cameras, and discloses a sliding shaft type VCM motor which comprises a base, a support movably arranged on the base and provided with a mounting cavity, a carrier movably arranged in the mounting cavity in the optical axis direction and a shell buckled on the base. A second electromagnetic set is arranged between the support and the carrier, and the support is provided with a guide sliding shaft which enables the carrier to be in sliding fit with the support in the optical axis direction. The first electromagnetic set is arranged between the base and the support so that transverse movement and longitudinal movement of the support can be independently controlled by the first electromagnetic set, the second electromagnetic set is arranged so that movement of the carrier can be independently controlled by the second electromagnetic set, and therefore the gap between the carrier and the support can be reduced, and cost is reduced. By arranging the guide sliding shaft, the carrier is guided in the optical axis direction, so that existing elastic sheet guide is replaced, deformation is avoided, and the service life is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of cameras, and particularly to a sliding-axis VCM motor. Background Art

[0002] A VCM motor, that is, a Voice Coil Motor, which is called a voice coil motor in Chinese, is a special form of direct drive motor. The VCM motor is based on Lorentz's law. When a carrier coil is in a magnetic field, the energized coil will generate a magnetic field, which interacts with the permanent magnetic field, thereby driving a load device (such as a lens) to perform a linear reciprocating motion. By changing the strength and direction of the current, the size and direction of the magnetic field can be changed, and further the linear motion frequency and distance of the load device can be controlled. In short, after the current is supplied to the coil, the magnetic field in the VCM motor generates a force to push the carrier coil (lens), and the precise movement of the lens is controlled by controlling the magnitude and direction of the coil current.

[0003] The micro cameras used in smart phones are the main application fields of voice coil motors. In terms of the existing technology, the main structural components of the existing VCM motors include a housing, a shrapnel, a lens carrier, a magnet, and a base. Among them, the traditional VCM motor uses the shrapnel technology to achieve the stability of the VCM motor in the optical axis direction. However, during the use of the traditional shrapnel, due to the influence of the magnetic force, the lens carrier is pulled, thereby driving the lens carrier to move along the optical axis direction. However, since the overall mass of the lens carrier plus the lens mounted on the lens carrier is relatively large compared to the shrapnel, this causes the shrapnel to often deform, break, and other adverse conditions during the use when the carrier moves along the optical axis direction. Summary of the Invention

[0004] Aiming at the deficiencies of the above-mentioned existing technology, the technical problem to be solved by the present invention is: to provide a sliding-axis VCM motor to solve the problems of deformation and fracture of the shrapnel that is vulnerable to the influence of the overall mass of the lens carrier and the lens when using the shrapnel to stabilize the movement of the VCM motor in the optical axis direction.

[0005] To solve the above technical problem, a technical solution adopted by the present invention is: to provide a sliding-axis VCM motor including a base, a bracket movably arranged on the base and having an installation cavity, a carrier movably arranged in the installation cavity along the optical axis direction and having a lens connection cavity, and a housing buckled on the base and surrounding the bracket inside the base and the bracket. A first electromagnetic group for controlling the movement of the bracket in the transverse and longitudinal directions is provided between the base and the bracket, a second electromagnetic group for controlling the movement of the carrier in the optical axis direction is provided between the bracket and the carrier, and a guiding sliding shaft for making the carrier slide in cooperation with the bracket along the optical axis direction is arranged on the bracket.

[0006] Furthermore, an activity space for the movement of the bracket is formed between the outer side walls of the base and the bracket. At the four corners of the base, first bosses are respectively protruded along the optical axis direction for supporting the four corners of the bracket, so that four first gaps are formed at intervals between one side surface of the bracket facing the base along the optical axis direction and the base. The first electromagnetic group includes a transverse electromagnetic group and a longitudinal electromagnetic group respectively arranged in two adjacent first gaps among them. The transverse electromagnetic group is used to drive the bracket to move transversely, and the longitudinal electromagnetic group is used to drive the bracket to move longitudinally.

[0007] Furthermore, rolling grooves are recessed on each of the first bosses, and a plurality of balls protruding outwards from the rolling grooves are installed in each of the rolling grooves. Upper steel sheets contacting the outer sides of the balls protruding out of the rolling grooves are respectively embedded at the four corners of the fourth surface of the bracket corresponding to the first bosses, and lower steel sheets contacting the other sides of the balls are embedded in each of the rolling grooves.

[0008] Furthermore, a first reinforcing rib is embedded in the bracket and is clamped on the transverse electromagnetic group and the longitudinal electromagnetic group. Each of the upper steel sheets includes a main body part embedded in the second surface of the bracket for contacting the balls and a first extending part integrally extending from the main body part and embedded in the bracket and connected to the first reinforcing rib. For two of the upper steel sheets corresponding to the guiding sliding shafts, a second extending part embedded in the bracket and used for connecting to the guiding sliding shafts is further included.

[0009] Furthermore, elastic pieces are respectively connected between the four corners of the third surface of the bracket facing away from the base and the four corners of the base along the optical axis direction.

[0010] Furthermore, second bosses are protruded at the four corners of the third surface of the bracket, so that the third surface of the bracket is recessed relative to each of the second bosses to form a supporting surface surrounding the outer periphery of the installation cavity. A limiting piece covering the supporting surface is attached to the supporting surface. The limiting piece forms an avoiding bevel for avoiding the second bosses at the positions corresponding to the second bosses, and the limiting piece blocks the carrier along the optical axis direction and has a through hole for the lens to pass through.

[0011] Furthermore, second grooves for placing dust compensation glue are recessed at the positions of the supporting surface corresponding to the four side walls of the bracket. Extension pieces are respectively extended backwards from the limiting piece at the positions corresponding to the second grooves, and avoiding grooves communicating with the second grooves are opened along the optical axis direction on the extension pieces.

[0012] Furthermore, side grooves with groove walls adjacent to the supporting surface are opened on one sides of the outer side walls of the bracket close to the second grooves, and one side edge of the extension piece far away from the limiting piece is bent and extended into the side grooves.

[0013] Further, the second electromagnetic group includes a unilateral magnetic group connected to one outer sidewall of the carrier and a coil group correspondingly arranged on the bracket with respect to the unilateral magnetic group; the outer sidewall of the carrier provided with the unilateral magnetic group is configured as the first outer sidewall, and a second gap is formed at an interval between the first outer sidewall and the corresponding cavity wall of the installation cavity. Two guiding sliding shafts are arranged in the second gap, and at positions corresponding to each guiding sliding shaft on the carrier, first guiding grooves communicating along the optical axis direction are recessed for part of the guiding sliding shafts to be located therein. One of the first guiding grooves is V-shaped, and the other first guiding groove is L-shaped. The carrier is slidably matched with the guiding sliding shafts along the optical axis direction through the first guiding grooves.

[0014] Further, a first groove is recessed on the first outer sidewall. The unilateral magnetic group includes a bearing plate riveted in the first groove and having retaining edges on opposite sides, and a first magnet held inside the bearing plate. A slot is formed through the middle of the bearing plate to expose part of the first magnet, and elastic pieces inclined toward the side opposite to the first magnet are integrally bent on both sides of the bearing plate on both sides of the slot. The elastic pieces are embedded in the carrier; the coil group includes a circuit board connected to the bracket, a magnetic attraction iron sheet connected to the circuit board, a coil magnetically coupled with the first magnet and connected to the side of the magnetic attraction iron sheet opposite to the circuit board, and a reinforcing steel sheet connected to the side of the circuit board opposite to the magnetic attraction iron sheet.

[0015] The sliding shaft type VCM motor of the present invention has at least the following beneficial effects: By arranging a first electromagnetic group between the base and the bracket, the lateral movement and longitudinal movement of the bracket are controlled by the first electromagnetic group alone. By arranging a second electromagnetic group, the movement of the carrier is controlled by the second electromagnetic group alone, so that the gap between the carrier and the bracket can be reduced, thereby reducing costs; By arranging guiding sliding shafts to guide the carrier in the optical axis direction, the existing elastic piece guiding is replaced to avoid deformation and improve the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The illustrative embodiments and descriptions thereof of the present application are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0017] Figure 1 is a schematic structural diagram of the VCM motor of the present invention;

[0018] Figure 2 is a front sectional view of the VCM motor of the present invention;

[0019] Figure 3 is a side sectional view of the VCM motor of the present invention;

[0020] Figure 4Exploded view of the VCM motor of the present invention;

[0021] Figure 5 is Figure 4 an enlarged view of part A shown;

[0022] Figure 6 Exploded view of the VCM motor of the present invention from another angle;

[0023] Figure 7 is Figure 6 an enlarged view of part B shown;

[0024] Figure 8 is Figure 6 an enlarged view of part C shown;

[0025] Figure 9 Schematic structural diagram of the VCM motor (hiding the housing) of the present invention;

[0026] Figure 10 is Figure 9 schematic structural diagram of the VCM motor (hiding the limit piece) shown;

[0027] Figure 11 is Figure 9 schematic structural diagram of the VCM motor (hiding the limit piece and the carrier) shown;

[0028] Figure 12 is Figure 9 schematic structural diagram of the VCM motor (hiding the limit piece and the bracket) shown;

[0029] Figure 13 is Figure 12 an enlarged view of part D shown;

[0030] Figure 14 is Figure 12 schematic structural diagram of the VCM motor (hiding the limit piece and the bracket) from another angle shown.

[0031] The meanings of the reference numerals in the drawings are as follows:

[0032] Base 1, hole cavity 11, support pillar 12, first boss 13, rolling groove 131, ball 132, reinforcement plate 14, conduction circuit 15, third boss 16, reinforcement piece 171, opening 172, first capacitor 173, first drive chip 174, bracket 2, installation cavity 21, third surface 221, concave angle 222, cavity side wall 223, support block 224, second boss 225, support surface 226, second groove 227, side groove 229, first side wall 231, second side wall 232, elastic piece 241, first stepped groove 242, second reinforcing rib 25, first reinforcing rib 26, first part 261, second part 262, third part 263, fourth part 264, fifth part 265, first groove body 271, second groove body 272, carrier 3, lens connection cavity 31, first outer side wall 321, second outer side wall 322, extension platform 33, concave surface 331, first groove 332, first guiding groove 333, housing 4, first electromagnetic group 5, transverse electromagnetic group 5a, longitudinal electromagnetic group 5b, second magnet 51, second coil 52, second electromagnetic group 6, single-sided magnetic group 61, bearing plate 611, slotted opening 6111, elastic piece 6112, retaining edge 6113, first magnet 612, coil group 62, circuit board 621, magnetic attraction iron sheet 622, first coil 623, reinforcing steel sheet 624, second capacitor 625, second drive chip 626, limiting piece 7, avoiding bevel edge 71, perforation 72, extension piece 73, first avoiding groove 74, upper steel sheet 81, main body part 811, first extension part 812, second extension part 813, lower steel sheet 82, guiding sliding shaft 9. Detailed implementation mode

[0033] The present invention will be further described below with reference to the accompanying drawings.

[0034] Please refer to Figures 1 to 14 , the sliding shaft type VCM motor of the present invention includes a base 1, a bracket 2 movably arranged on the base 1 and having an installation cavity 21, a carrier 3 movably arranged in the installation cavity 21 along the optical axis direction and having a lens connection cavity 31, a housing 4 buckled on the base 1 and surrounding the bracket 2 inside it together with the base 1, a first electromagnetic group 5 arranged between the base 1 and the bracket 2, and a second electromagnetic group 6 arranged between the bracket 2 and the carrier 3. The base 1 and the housing 4 are buckled with each other to play a role of fixed support. The lens connection cavity 31 of the carrier 3 is used for screwing in a lens. The carrier 3 supports the lens, the bracket 2 supports the carrier 3, the first electromagnetic group 5 is used to control the movement of the bracket 2 in the transverse and longitudinal directions, and the second electromagnetic group 6 is used to control the movement of the carrier 3 along the optical axis direction, so that the movement of the carrier 3 and the movement of the bracket 2 are carried out separately, reducing the setting difficulty of the carrier 3, realizing the all-round adjustment of the lens to realize the adjustment of the focal length, and ensuring the imaging of the lens.

[0035] Please refer to Figure 4 , Figure 6, Figures 8 to 14 In this embodiment, the base 1 is a rectangular parallelepiped structure having a length, a width, and a height. The length and the width of the base 1 may be the same and the side length may be different. With the height (or thickness) of the base 1 as the optical axis direction as a reference, the direction in which the length of the base 1 is located is configured as the horizontal direction, the width direction of the base 1 is matched to the longitudinal direction, and the two sides of the base 1 along the optical axis direction are configured as the first surface and the second surface of the base 1. A cavity 11 is opened on the first surface of the base 1 along the optical axis direction, and the cavity 11 passes through the second surface along the optical axis direction and passes through the base 1. The base 1 includes a square bottom plate and pillars 12 formed at the four corners of the bottom plate. The first surface and the second surface are formed on the bottom plate, and each pillar 12 is integrally connected to the bottom surface of the bottom plate and has the same height. The space enclosed by the four pillars 12 and the bottom plate is defined as the accommodation space, and the bracket 2 is installed in the accommodation space. The four pillars 12 limit the bracket 2, and prevent the bracket 2 from leaving the accommodation space in the horizontal and longitudinal directions while ensuring that the bracket 2 is installed in the accommodation space.

[0036] In the content defined in this embodiment, the four corners of the base 1 are convexly provided with first bosses 13 for supporting the four corners of the bracket 2 along the optical axis direction. The four first bosses 13 are respectively connected to the pillars 12 at the positions. The four corners of the bracket 2 are respectively supported on the four first bosses 13 during assembly. The first surface between any two adjacent first bosses 13 can be defined as a spacing surface. The support of the bracket 2 by the first boss 13 makes the spacing surface and the bracket 2 separated to form a first gap. The first gap is set so that circuit components can pass through and are easy to arrange. A reinforcing plate 14 is laid on the first surface of the bottom plate. The positions of the reinforcing plate 14 corresponding to the pillars 12 and the first bosses 13 are hollowed out to avoid the pillars 12 and the first bosses 13. The reinforcing plate 14 is also hollowed out at the position of the installation cavity 21. Among them, the reinforcing plate 14 also covers the spacing surface and is made of wire material. A conducting circuit 15 is embedded inside the bottom plate and arranged inside the pillar 12. It ensures the circuit connection and serves as a reinforcing rib, thereby improving the strength of the base 1. A third boss 16 is convexly provided on the outer wall of the bottom plate and at the four corners. A groove body adapted to the third boss 16 is concavely provided at the position corresponding to the third boss 16 on the shell 4, so that the shell 4 is supported on the third boss 16 through the groove body.

[0037] Please refer to Figures 2 to 4 , Figures 5 to 14, in this embodiment, the two side surfaces of the bracket 2 along the optical axis direction are respectively defined as the third surface 221 and the fourth surface. Among them, the third surface 221 is located on the side away from the base 1, and the fourth surface is used to support the bottom plate close to the base 1 on each first boss 13. In order to adapt to the support column 12, concave corners are formed at the four corner positions of the bracket 2, so that the outer side walls between any two concave corners of the bracket 2 protrude relative to each corner. The four corners of the bracket 2 are respectively supported on the four first bosses 13. A rolling groove 131 is recessed on each first boss 13. The rolling groove 131 can be a cylindrical cavity structure or other geometric body shapes. A plurality of balls 132 extending outward from the rolling groove 131 are installed in each rolling groove 131 to provide support during the movement of the bracket 2 without hindering the movement of the bracket 2. 4 to 5 balls 132 can be placed in each rolling groove 131 to provide the main support for the movement of the bracket 2. Among them, an activity space is formed by the interval between the concave corner and the support column 12 after the bracket 2 is supported on the first boss 13, and the activity space enables the bracket 2 to move in the horizontal and vertical directions. An installation cavity 21 in the shape of a square with a side length greater than or equal to the diameter of the activity cavity is formed on the bracket 2, and the installation cavity 21 is adapted to the carrier 3 and its size is slightly larger than the size of the carrier 3. Among them, the installation cavity 21 is located at the center position of the bracket 2, and the fourth surface part between any two concave corners and the spacer surface form the first gap. The four inner side walls of the installation cavity 21 divided along the horizontal and vertical directions and the side close to the bottom plate are defined as cavity side edges 223. Support blocks 224 protrude and extend on at least two opposite cavity side edges 223, and the inner side edge of each support block 224 is arc-shaped corresponding to the hole cavity 11 along the optical axis direction, so that the projections of each support block 224 and the hole cavity 11 in the optical axis direction are overlapping circles. In one embodiment, support blocks 224 are provided on two opposite cavity side edges 223, and a support block 224 is provided at the end where one cavity side edge 223 adjacent to these two cavity side edges 223 intersects, so there are a total of four support blocks 224 for supporting the carrier 3. Among them, the second electromagnetic group 6 is arranged on the inner wall of the installation cavity 21 where the remaining cavity side edge 223 without the support block 224 is located, and this side wall of the bracket 2 is defined as the first side wall 231, and the other side walls of the bracket 2 are defined as the second side walls 232. In order to facilitate the installation of the second electromagnetic group 6, the fourth surface of the bracket 2 and the position corresponding to the first side wall 231 protrude along the optical axis direction to increase the overall size, and the bottom plate is correspondingly recessed at the protruding part to ensure the formation of the first gap.

[0038] In this embodiment, elastic pieces 241 are connected between the four corners of the support 2 and the four corners of the base 1 in the direction away from the third surface 221 of the base 1 along the optical axis direction for auxiliary support of the support 2. Among them, first stepped grooves 242 are recessed at the four corners of the third surface 221, and each first stepped groove 242 communicates with the inner concave angle. A plurality of connecting columns are convexly provided in each first stepped groove 242 and on the end surface of the support column 12 away from the bottom plate. Holes are correspondingly provided at both ends of the elastic piece 241 for each connecting column, so that each connecting column penetrates into each hole and can be connected by soldering or fixed by other means, so that both ends of the elastic piece 241 are respectively connected to the support 2 and the base 1, so that the elastic pieces 241 are distributed from the four corners. Among them, second reinforcing ribs 25 are embedded in the circumferential direction of the installation cavity 21 inside the support 2. One end of each second reinforcing rib 25 extends to each first stepped groove 242 to be connected to each elastic piece 241, and the second reinforcing rib 25 also has an end extending and connected to the second electromagnetic group 6, so as to ensure the smoothness of the internal circuit of the motor.

[0039] In this embodiment, second bosses 225 are convexly provided at the four corners of the third surface 221 of the support 2, so that the third surface 221 of the support 2 is recessed with a support surface 226 surrounding the outer circumference of the installation cavity 21 relative to each second boss 225. Among them, the first stepped groove 242 and the second boss 225 are independent of each other. The support 2 has four sides relative to the installation cavity 21. The second boss 225 and the first stepped groove 242 at each corner are respectively located on the two side edges corresponding to the corner and do not affect each other. A limiting piece 7 covering the support surface 226 is attached to the support surface 226. The limiting piece 7 is formed with an avoidance bevel 71 for avoiding the second boss 225 at the position corresponding to each second boss 225, and the limiting piece 7 blocks the carrier 3 in the optical axis direction and has a through hole 72 for the lens to pass through, so that the limiting piece 7 is used to reinforce the support 2 while limiting the carrier 3 of the installation cavity 21. Second grooves 227 for placing dust compensation glue are recessed at the positions corresponding to the four side walls of the support 2 on the support surface 226. Extension pieces 73 extend backward at the positions of the limiting piece 7 corresponding to the second grooves 227. A first avoidance groove 228 communicating with the second groove 227 is provided in the extension piece 73 along the optical axis direction. Side grooves 229 are provided on the outer side walls of the support 2 close to the second grooves 227. The groove wall of the side groove 229 is adjacent to the support surface 226, so that the side groove 229 and the support surface 226 are in an L shape. The side edge of the extension piece 73 away from the limiting piece 7 is bent and extended into the side groove 229 to be in an L shape, so as to increase the contact area between the limiting piece 7 and the support 2, so that the limiting piece 7 is buckled on the third surface 221 of the support 2, and while avoiding the first avoidance groove 228, ensuring the connection firmness between the limiting piece 7 and the support 2.

[0040] Please refer to Figures 2 to 7 、 Figures 9 to 14, in this embodiment, the first electromagnetic group 5 includes a transverse electromagnetic group 5a and a longitudinal electromagnetic group 5b. The transverse electromagnetic group 5a and the longitudinal electromagnetic group 5b are respectively arranged in one of the adjacent two first gaps. The transverse electromagnetic group 5a is used to drive the bracket 2 to move transversely, and the longitudinal electromagnetic group 5b is used to drive the bracket 2 to move longitudinally. In the content defined in this embodiment, the bracket 2 is embedded with a first reinforcing rib 26 that is held against the transverse electromagnetic group 5a and the longitudinal electromagnetic group 5b. The first reinforcing rib 26 is made of a conductive metal, which not only increases the strength of the bracket 2 but also conducts the current for the first electromagnetic group 5 and the second electromagnetic group 6. Among them, the first reinforcing rib 26 includes three groups of internal reinforcing ribs. The three groups of internal reinforcing ribs are respectively located inside the bracket 2 where the three second side walls 232 are located. Each internal reinforcing rib includes a first portion 261 arranged parallel to the length direction of the second side wall 232 where it is located, a second portion 262 that extends inward from the first portion 261 and then bends toward the bottom plate side along the optical axis direction, a third portion 263 that bends toward the bottom plate side along the optical axis direction from the end of the first portion 261, and a fourth portion 264 that extends outward from the side of the first portion 261 opposite to the side where the second portion 262 is located and away from the second portion 262. An embracing cavity is jointly defined by the inner sides of each portion. Both the transverse electromagnetic group 5a and the longitudinal electromagnetic group 5b include a second magnet 51 and a second coil 52. Among them, the second magnets 51 of the transverse electromagnetic group 5a and the longitudinal electromagnetic group 5b are respectively arranged in two adjacent embracing cavities and are held tightly and fixed by the internal reinforcing ribs. The second coils 52 of the transverse electromagnetic group 5a and the longitudinal electromagnetic group 5b are respectively connected to the reinforcing plates 14 corresponding to the two spaced surfaces of the second magnet 51. At the two spaced surfaces corresponding to the second magnet 51 and located inside the bottom plate, a reinforcing piece 171 that is adhesively connected to the reinforcing plate 14 is embedded. An opening 172 is provided in the reinforcing piece 171, and a first capacitor 173 and a first drive chip 174 that are respectively connected to the reinforcing plate 14 are provided in the opening 172 to detect the position of the carrier 3 to achieve a closed loop. Among them, there is a gap between the second coil 52 and the second magnet 51, so that the second magnet 51 can drive the bracket 2 to move transversely or longitudinally after being energized. In this embodiment, for the internal reinforcing rib that holds the second magnet 51, the fourth portion 264 bends toward the base 1 side along the optical axis direction to further wrap the second magnet 51 and improve stability. And on the side of each portion away from the first portion 261, a fifth portion 265 that bends inward and extends is formed to be adapted to the support block 224 and is respectively embedded in each support block 224. The shape of the fifth portion 265 is the same as that of the support block 224 to strengthen the strength of the support block 224.In this embodiment, in order to reduce the wear of the rolling balls 132 on the bracket 2 during the movement of the horizontal electromagnetic group 5a and the vertical electromagnetic group 5b driving the bracket 2 respectively, upper steel sheets 81 that contact the outer side of the rolling balls 132 extending out of the rolling grooves 131 are embedded at the four corners of the fourth surface of the bracket 2 corresponding to the first boss 13, and lower steel sheets 82 that contact the other side of the rolling balls 132 are embedded in each rolling groove 131. The upper steel sheet 81 includes a main body portion 811 embedded in the bottom surface of the bracket 2 for contacting the rolling balls 132 and a first extension portion 812 integrally extending from the main body portion 811 and embedded in the bracket 2 and connected to the first reinforcing rib 26. Among them, the first extension portion 812 is connected to the third portion 263 of the internal reinforcing rib adjacent to it to achieve internal current conduction. It should be noted that the first reinforcing rib 26, the second reinforcing rib 25, the conduction circuit 15, the reinforcing patch 171, etc. are all cast in the mold before the injection molding of the base 1 or the bracket 2.

[0041] Please refer to Figures 1 to 4 , Figure 6 , Figure 9 , Figure 10 , Figures 12 to 14 , in this embodiment, the shape of the carrier 3 is adapted to the shape of the installation cavity 21 and is a square structure, and the side length of the carrier 3 is slightly smaller than the side length of the installation cavity 21, so that the carrier 3 can be movably installed in the installation cavity 21 along the optical axis direction, and the height of the carrier 3 is less than the depth of the installation cavity 21, so that the carrier 3 can move relative to the installation cavity 21 along the optical axis direction. The carrier 3 has a fifth surface and a sixth surface in the optical axis direction. A lens connection cavity 31 that penetrates through the fifth surface and the sixth surface of the carrier 3 is provided on the carrier 3 along the optical axis direction. The lens is assembled in the lens connection cavity 31, so that the carrier 3 can carry the lens and the lens can move along the optical axis direction with the carrier 3 when the first electromagnetic group 5 cooperates for focusing and distance adjustment. The carrier 3 has four outer side walls. One outer side wall of the carrier 3 corresponding to the first side wall 231 of the bracket 2 is defined as the first outer side wall 321, and the other three outer side walls are configured as the second outer side walls 322. A second gap is formed at an interval between the first outer side wall 321 and the corresponding cavity wall of the installation cavity 21, and the second electromagnetic group 6 is installed in the second gap.

[0042] Please refer to Figures 2 to 12, in this embodiment, the second electromagnetic group 6 includes a single-sided magnetic group 61 connected to the first outer wall 321 and a coil group 62 disposed on the bracket 2 corresponding to the single-sided magnetic group 61. After the single-sided magnetic group 61 is mounted in the mounting cavity 21 along with the carrier 3, the coil group 62 is distributed opposite to the single-sided magnetic group 61 and can cooperate with each other. To ensure that the electromagnetic force generated by the single-sided magnetic group 61 and the coil group 62 after being energized can push the carrier 3 to move, there are spaced distributions between each outer wall of the carrier 3 and each cavity wall of the mounting cavity 21. An extension platform 33 protrudes on the first outer wall 321 corresponding to the single-sided magnetic group 61, and the two parts of the first outer wall 321 respectively close to both sides of the second outer wall 322 are recessed relative to the extension platform 33 and are each configured as a concave surface 331, and the extension platform 33 is located between the two concave surfaces 331. As a part of the first outer wall 321, a mating plane is provided on the side surface of the extension platform 33 away from or facing away from the carrier 3, and a first groove 332 is recessed in the mating plane, and the single-sided magnetic group 61 is mounted in the first groove 332.

[0043] A guiding sliding shaft 9 is provided between the carrier 3 and the cavity wall of the mounting cavity 21. The guiding sliding shaft 9 is cylindrical and is used to guide and support the carrier 3 after the single-sided magnetic group 61 and the coil group 62 are energized, so that the carrier 3 slides along the optical axis direction. The guiding sliding shaft 9 is provided with at least two and is disposed in the second gap. In this embodiment, the guiding sliding shaft 9 is provided with two. To avoid the guiding sliding shaft 9 affecting the cooperation between the coil group 62 and the single-sided magnetic group 61, the two guiding sliding shafts 9 are respectively disposed on both sides of the extension platform 33 and are respectively opposite to the concave surfaces 331 and are spaced apart. Among them, the two guiding sliding shafts 9 are both arranged along the optical axis direction and are connected to the first boss 13. The guiding sliding shaft 9 can be fixed to the first boss 13 by pasting or sequentially screwing with screws. The two upper steel sheets 81 each further include a second extension part 813 embedded in the bracket 2 and used for connecting to the guiding sliding shaft 9 corresponding to the guiding sliding shaft 9. Among them, screw holes can be opened on the second extension part 813 to use screws to pass through the screw holes and be screwed on the guiding sliding shaft 9 to achieve connection and fixation, so that while the upper steel sheet 81 is used to avoid the wear of the bracket 2 by the balls 132, the current conduction inside the entire bracket 2 and the fixation of the guiding sliding shaft 9 are ensured.

[0044] On the corresponding cavity walls of the installation cavity 21, at positions opposite to the guiding sliding shaft 9, second guiding grooves in a V shape or a semi-circular shape are recessed. The second guiding grooves are open towards the carrier 3 side to communicate with the installation cavity 21, and the second guiding grooves communicate with the bracket 2 along the optical axis direction towards the side away from the boss. The middle part of the second guiding grooves is recessed towards the side away from the installation cavity 21. On the two concave surfaces 331, at positions opposite to the second guiding grooves and the guiding sliding shaft 9 respectively, first guiding grooves 333 are recessed. The shape of the first guiding grooves 333 can be mirror-symmetrically opened with the second guiding grooves, or can be other shapes. Any one of the first guiding grooves 333 and the second guiding groove opposite thereto jointly enclose a guiding cavity, and the guiding sliding shaft 9 is located in the guiding cavity while the side facing away from the second guiding groove is located in the first guiding groove 333. In this embodiment, one of the first guiding grooves 333 is in a V shape, and the other first guiding groove 333 is in an L shape. The L-shaped first guiding groove 333 is also open towards the guiding sliding shaft 9 side and communicates along the optical axis direction, and the L-shaped first guiding groove 333 also communicates and is open towards the side away from the V-shaped first guiding groove 333. The V-shaped first guiding groove 333 performs precise positioning on the guiding sliding shaft 9 to ensure the relative positions between the guiding sliding shaft 9, the bracket 2, and the carrier 3, enabling the secondary guiding sliding shaft 9 to guide the carrier 3 along the optical axis direction while enabling the carrier 3 to lean against the guiding sliding shaft 9 in a line contact manner. Similarly, the carrier 3 only needs to lean against the guiding sliding shaft 9 to complete the guiding. The L-shaped first guiding groove 333 only needs to lean against the carrier 3 to perform rough positioning on the carrier 3 and restrict the rotation of the carrier 3, etc. In this way, the carrier 3 is slidably matched with the guiding sliding shaft 9 along the optical axis direction through the first guiding groove 333 to conduct guiding, thereby replacing the traditional guiding method of the elastic piece 241 and improving the service life. The inlet pipe guiding sliding shaft 9 is suitable for line contact when contacting the first guiding groove 333, but in order to further reduce the wear of the carrier 3, second avoidance grooves are recessed at the middle positions of the two first guiding grooves 333 along the optical axis direction, so that the parts of the second avoidance grooves will not contact the guiding sliding shaft 9, but can still maintain the cooperation between the guiding sliding shaft 9 and the carrier 3.

[0045] In this embodiment, the unilateral magnetic group 61 includes a bearing plate 611 riveted in the first groove 332 and having retaining edges 6113 on opposite sides, and a first magnet 612 held inside the bearing plate 611. A slot 6111 is formed through the middle of the bearing plate 611 to expose part of the first magnet 612. Elastic pieces 6112 that are bent integrally on both sides of the slot 6111 of the bearing plate 611 and inclined away from the first magnet 612 are embedded in the carrier 3 to be clamped in the carrier 3 in all directions of the optical axis direction, transverse direction, and longitudinal direction to maintain firm connection. The coil group 62 includes a circuit board 621 connected to the bracket 2, a magnetic iron sheet 622 connected to the circuit board 621, a first coil 623 connected to the back of the magnetic iron sheet 622 facing away from the circuit board 621 and magnetically cooperating with the first magnet 612, and a reinforcing steel sheet 624 connected to the back of the circuit board 621 facing away from the magnetic iron sheet 622. To facilitate the circuit arrangement of the circuit board 621, a first groove 271 for the circuit board 621 to penetrate into is formed on the corresponding side of the bracket 2 on the side away from the installation cavity 21, a second groove 272 communicating with the first groove 271 and having a size smaller than that of the first groove 271, and a third groove communicating with the second groove 272 and located on the side close to the installation cavity 21. The size of the third groove is larger than that of the second groove 272, that is, the length of the third groove is greater than the length of the second groove 272, and the width of the third groove is greater than the width of the second groove 272. The circuit board 621 is connected in the first groove 271, the reinforcing steel sheet 624 is located in the first groove 271, the coil magnetic iron sheet 622 is located in the third groove, and the first coil 623 is connected to the magnetic patch and located in the third groove and close to the first magnet 612.

[0046] In the content defined in this embodiment, the circuit board 621 is selected as an FPC (flexible printed circuit board 621), and the second reinforcing rib 25 is connected to the circuit board 621. In order to avoid the difficulty of easy detachment during the assembly of the circuit board 621, a convex post is provided protruding in the first groove body 271, and holes for the convex post to pass through are provided on both the circuit board 621 and the reinforcing steel sheet 624. Welding grooves are provided on the bracket 2, the circuit board 621, and the reinforcing steel sheet 624 to facilitate subsequent circuit welding. During assembly, the first coil 623 needs to be aligned with the first magnet 612, and there is a moving space between the first coil 623 and the first magnet 612, so that the circuit board 621 generates an electromagnetic force after energizing the coil to drive the carrier 3 to move along the optical axis direction. Among them, a suction force is generated between the first magnet 612 and the magnetic iron sheet 622, so that the communication carrier 3 is closely attached to the guiding sliding shaft 9 at this time, and the flatness of the carrier 3 is ensured by relying on the overall perpendicularity of the guiding sliding shaft 9, so as to avoid the inclination of the carrier 3 to a certain extent. It should be noted that a second capacitor 625 and a second driving chip 626 are provided on the side of the circuit board 621 facing the first magnet 612 and inside the first coil 623, which can detect the position of the carrier 3 to achieve a closed loop.

[0047] One working mode of the sliding shaft type VCM motor of the present invention is as follows: after the lens is installed in the lens connection cavity 31, the operation of the first magnet 612 and the first coil 623 is used to drive the carrier 3 to move along the optical axis direction for focusing and distance adjustment. The guiding sliding shaft 9 is used to provide support and guidance for the carrier 3 during this process, and the second coil 52 and the second magnet 51 are used to drive the bracket 2 to move horizontally and vertically respectively, so as to drive the carrier 3 and the lens on the bracket 2 to move for focusing.

[0048] Compared with the prior art, for the sliding shaft type VCM motor of the present invention, since the carrier 3 generates a driving force in the optical axis direction through the first magnet 612 and the first coil 623, magnetic interference will occur between the magnets, and in severe cases, the first magnet 612 will fail. However, the design of a single first magnet 612 and the first coil 623 in the present invention can better avoid magnetic interference from the other three sides. At the same time, the design of the single-sided first magnet 612 enables the distance between the other sides to be reduced, greatly saving space and reducing the volume, thereby reducing the production cost. Among them, a gap of 0.1 mm is left between the carrier 3 and the bracket 2 as a whole, and the corners are rounded to ensure large-area contact during collision and reduce the risk of chipping caused by impact; the setting of the upper steel sheet 81 and the lower steel sheet 82 reduces the wear of the bracket 2 and improves the stability and firmness of the guiding sliding shaft 9. The first electromagnetic group 5 and the second electromagnetic group 6 are respectively under closed-loop control, and can accurately control the movement of the carrier 3 in the optical axis direction, horizontally and vertically in real time.

Claims

1. A sliding shaft VCM motor, characterized in that: The invention comprises a base, a bracket movably arranged on the base and having an installation cavity, a carrier having a lens connection cavity movably arranged in the installation cavity along the optical axis direction, and a shell buckled on the base and enclosing the bracket with the base, a first electromagnetic group for controlling the bracket to move in the lateral and longitudinal directions is arranged between the base and the bracket, a second electromagnetic group for controlling the carrier to move in the optical axis direction is arranged between the bracket and the carrier, and a guide sliding shaft is arranged on the bracket to enable the carrier to slide and cooperate with it in the optical axis direction.

2. The sliding shaft type VCM motor according to claim 1, characterized in that: A movable space for the bracket to move is formed between the base and the outer side walls of the bracket. First bosses for supporting the bracket at the four corners are protruded along the optical axis direction at the four corners of the base, so that four first gaps are formed between the side of the bracket facing the base along the optical axis direction and the base; the first electromagnetic group includes a transverse electromagnetic group and a longitudinal electromagnetic group respectively arranged in two adjacent first gaps, the transverse electromagnetic group is used to drive the bracket to move in the transverse direction, and the longitudinal electromagnetic group is used to drive the bracket to move in the longitudinal direction.

3. The sliding shaft type VCM motor according to claim 2, characterized in that: Each of the first bosses is recessed with a rolling groove, and each of the rolling grooves is provided with a plurality of balls extending out of the rolling groove. An upper steel sheet in contact with one side of the ball extending out of the rolling groove is embedded on the fourth side of the bracket and corresponding to the four corners of the first boss, and a lower steel sheet in contact with the other side of the ball is embedded in each of the rolling grooves.

4. The sliding shaft type VCM motor according to claim 3, characterized in that: A first reinforcing rib is embedded in the bracket and is engaged with the transverse electromagnetic group and the longitudinal electromagnetic group; each of the upper steel sheets includes a main body portion embedded in the second surface of the bracket and used to contact the ball, and a first extension portion embedded in the bracket and extending from the main body portion to form an integral part and connected to the first reinforcing rib, wherein the two upper steel sheets corresponding to the guide sliding shaft also include a second extension portion embedded in the bracket and used to connect to the guide sliding shaft.

5. The sliding shaft type VCM motor according to claim 2, characterized in that: Shrapnels are connected between the four corners of the third surface of the bracket facing away from the base along the optical axis and the four corners of the base respectively.

6. The sliding shaft type VCM motor according to claim 3 or 4, characterized in that: Second bosses are convexly provided at the four corners of the third surface of the bracket, so that the third surface of the bracket is concavely provided with a supporting surface enclosed in the outer periphery of the mounting cavity relative to each second boss, and a limiting plate covering the supporting surface is attached to the supporting surface, and an avoidance bevel edge for avoiding the second boss is formed at the position of the limiting plate corresponding to each second boss, and the limiting plate blocks the carrier along the optical axis direction and has a through hole for the lens to pass through.

7. The sliding shaft type VCM motor according to claim 6, characterized in that: Second grooves for placing dust-removing glue are provided on the support surface at positions corresponding to the four side walls of the bracket, and extension plates are extended backward at positions corresponding to each second groove of the limiting plate, and avoidance grooves connected to the second grooves are opened on the extension plates along the optical axis direction.

8. The sliding shaft type VCM motor according to claim 7, characterized in that: A side groove whose groove wall is adjacent to the supporting surface is formed on one side of each outer side wall of the bracket close to the second groove, and a side edge of the extension piece away from the limiting piece is bent and extends into the side groove.

9. The sliding shaft type VCM motor according to claim 1, characterized in that: The second electromagnetic group includes a single-sided magnetic group connected to one of the outer walls of the carrier and a coil group arranged on the bracket corresponding to the single-sided magnetic group; the outer wall of the carrier where the single-sided magnetic group is provided is configured as a first outer wall, and a second gap is formed between the first outer wall and the corresponding cavity wall of the installation cavity, and the guide slide shaft is arranged in the second gap and is provided in two, and a first guide groove connected along the optical axis direction for part of the guide slide shaft to be located therein is recessed at the position corresponding to each guide slide shaft on the carrier, wherein one of the first guide grooves is V-shaped, and the other of the first guide grooves is L-shaped, and the carrier slides in sliding cooperation with the guide slide shaft along the optical axis direction through the first guide groove.

10. The sliding shaft type VCM motor according to claim 9, characterized in that: A first groove is concavely provided on the first outer side wall, and the single-sided magnetic group includes a supporting plate riveted in the first groove and having ribs on opposite sides, and a first magnet embraced on the inner side of the supporting plate, a groove is opened through the middle of the supporting plate to make part of the first magnet visible, and elastic sheets inclined to the side facing away from the first magnet are formed by integrally bending on both sides of the groove on the supporting plate, and the elastic sheet is embedded in the carrier; the coil group includes a circuit board connected to the bracket, a magnetic absorption sheet connected to the circuit board, a coil connected to the side of the magnetic absorption sheet facing away from the circuit board and magnetically cooperating with the first magnet, and a reinforcing steel sheet connected to the side of the circuit board facing away from the magnetic absorption sheet.

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