An anti-shake motor

Abstract

The present invention provides an anti-shake motor, including a single-axis focus motor, a translational force structure, and a suspension structure. The single-axis focus motor includes a focus coil and a permanent magnet. The focus coil can generate magnetic induction with the permanent magnet to drive the single-axis focus motor to move along the Z axis for focusing. The single-axis focus motor is suspended above the translational force structure through the suspension structure. The translational force structure includes a translation coil. The translation coil can generate magnetic induction with the permanent magnet to drive the single-axis focus motor to move along the X axis and / or Y axis to achieve shake correction. The setting of the anti-shake motor suspension structure of the present invention enables the single-axis focus motor to move in the X / Y axis to achieve shake correction in addition to moving in the Z axis direction for focusing; in addition, the elastic coefficient of the suspension structure in the X / Y axis direction is adjustable, and the adjustment of the elastic coefficient does not affect the load-bearing performance in the Z axis direction, so that the suspension structure can bear a large lens.

Description

Technical Field

[0001] The present invention relates to the field of voice coil motors, and in particular to an anti-shake motor. Background Art

[0002] With the continuous updating and improvement of mobile terminal products, the functions are constantly evolving, and people's requirements for photography and videography are also constantly increasing. Optical image stabilization motors have also come into being, which solves the problem of poor image quality caused by shaking during photography. The current anti-shake methods mainly include the following: 1. Ball type, the translation system moves by current driving to overcome the rolling friction of the ball to achieve the anti-shake effect; 2. Using the principle of cold expansion and heat contraction of materials, when the memory metal is energized, the memory metal heats up to shrink the material and drive the motor to move, thereby achieving the anti-shake effect.

[0003] However, the above anti-shake methods have the following defects: 1. The ball-type anti-shake system must use closed-loop position control because the translation system overcomes rolling and sliding friction; and this method requires extremely high-precision ceramic balls, which are expensive; in addition, the ball is small and difficult to assemble, and the product is prone to collision pits between the magnetic beads and the injection molded parts during mechanical impact testing, resulting in focus jams. 2. Using the anti-material principle of memory metal, fatigue fracture problems are prone to occur.

[0004] In view of this, the inventor of the present application invented an anti-shake motor. Summary of the invention

[0005] The object of the present invention is to provide a motor with reasonable and compact structure, low cost and capable of carrying a large lens to achieve anti-shake.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: an anti-shake motor, comprising a single-axis focus motor, a translational force structure coaxially arranged with the single-axis focus motor, and a suspension structure that can undergo elastic deformation in both the X / Y axis directions, the single-axis focus motor comprising a focus coil and a permanent magnet, the focus coil can undergo magnetic induction with the permanent magnet to drive the single-axis focus motor to move and focus along the Z axis, the suspension structure is fixedly connected to the single-axis focus motor and the translational force structure, the single-axis focus motor is suspended above the translational force structure through the suspension structure, the translational force structure comprises a translation coil, the translation coil can undergo magnetic induction with the permanent magnet to drive the single-axis focus motor to move along the X axis and / or Y axis to achieve shake correction.

[0007] Furthermore, the suspension structure includes a plurality of suspension units formed by vertical spring sheets, and each suspension unit is fixedly connected to the single-axis focus motor and the translational force structure.

[0008] Furthermore, the plurality of suspension units are arranged rotationally symmetrically about the center of the single-axis focusing motor.

[0009] Furthermore, the number of the suspension units is four, and the four suspension units are arranged around the outer peripheral side of the permanent magnet. The suspension unit is L-shaped, and its bending part is arranged corresponding to the corner of the single-axis focusing motor, and the two ends are the first fixed end and the second fixed end respectively fixed to the single-axis focusing motor and the balanced power structure.

[0010] Furthermore, the suspension unit includes a first spring sheet, a second spring sheet, and a connecting piece that connects and fixes the first spring sheet and the second spring sheet so that the suspension unit as a whole is L-shaped, and the ends where the first spring sheet, the second spring sheet and the connecting piece are connected and fixed are each provided with a first snap-in opening facing downward, and the connecting piece is correspondingly provided with two first snap-in protrusions that match and engage with the first snap-in.

[0011] Furthermore, the suspension unit comprises a third long spring piece, and the third spring piece is integrally bent into an L shape.

[0012] Furthermore, the number of the permanent magnets is four, which are respectively located at the four corners of the single-axis focus motor and are rotationally symmetrical about the center of the single-axis focus motor, and the focus coil is located on the inner side of the permanent magnet.

[0013] Furthermore, the translational force structure includes an upper base and a lower base assembled and fixed up and down, and a flexible circuit board installed between the upper base and the lower base, the upper base is provided with four clearance holes which are rotationally symmetrical about the center of the translational force structure, the four clearance holes are respectively located at the four corners of the upper base, the translation coil is located at the lower base and is arranged one-to-one with the clearance holes, the translation coil extends out of the upper base through the clearance holes and is located one-to-one under the permanent magnet.

[0014] Furthermore, the lower base is provided with four winding posts for facilitating the winding of the translation coil and a fixed post for auxiliary winding. The four winding posts are arranged in one-to-one correspondence with the positions of the translation coil, and the flexible circuit board has a second and a third clearance hole corresponding to avoiding the winding posts and the fixed post.

[0015] Furthermore, the flexible circuit board, the second fixed end, the first fixed end, and the focusing coil are electrically connected in sequence.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The anti-shake motor of the present invention has a simple structure and a reasonable and compact design. The single-axis focus motor is suspended by a suspension structure. Through the magnetic induction of the coil and the permanent magnet, the single-axis focus motor can move in the X / Y axis to achieve shake correction in addition to moving in the Z-axis direction for focusing. In addition, the elastic coefficient of the suspension structure in the X / Y axis direction is adjustable, and the adjustment of the elastic coefficient does not affect the bearing performance in the Z-axis direction. In this way, the suspension structure can adjust the appropriate elastic coefficient in the X / Y axis direction according to the weight of the lens, and at the same time, it also lays a foundation for the suspension structure to bear a large lens (heavy weight). BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a schematic diagram of an anti-shake motor according to embodiment 1 of the present invention;

[0020] Figure 2 is an exploded schematic diagram of an anti-shake motor according to Embodiment 1 of the present invention;

[0021] Figure 3 is a schematic diagram of the anti-shake motor without the protective cover in Embodiment 1 of the present invention;

[0022] Figure 4 is a schematic diagram of the interior of a single-axis focus motor according to Embodiment 1 of the present invention;

[0023] Figure 5 is a schematic diagram of the translational force structure of Embodiment 1 of the present invention;

[0024] Figure 6 is a schematic diagram of a flexible circuit board according to embodiment 1 of the present invention;

[0025] Figure 7 This is a schematic diagram of the first embodiment of the present invention after the translation coil winding is completed;

[0026] Figure 8 This is a schematic diagram of the final welding of the translation coil in Example 1 of the present invention;

[0027] Fig. 9 is a schematic diagram of the suspension structure of embodiment 1 of the present invention;

[0028] Fig.10 is an exploded schematic diagram of a suspension unit according to Embodiment 1 of the present invention;

[0029] Fig.11This is a schematic diagram of a punching method for a spring sheet in Example 1 of the present invention;

[0030] Fig.12 is a schematic diagram of the suspension structure of embodiment 2 of the present invention;

[0031] Fig.13 It is a schematic diagram of a suspension unit according to Embodiment 2 of the present invention.

[0032] Main component symbols

[0033] 10- Single axis focus motor,

[0034] 11-focusing coil, 12-permanent magnet,

[0035] 20-Translational force structure,

[0036] 21-upper base, 211-first clearance hole, 212-second clamping protrusion,

[0037] 22-lower base, 221-translation coil, 222-winding column, 223-fixed column,

[0038] 23- flexible circuit board, 231- second clearance hole, 232- third clearance hole,

[0039] 30- Suspension structure,

[0040] 31-suspension unit, 311-first fixed end, 312-second fixed end, 313-first extension part, 314-second extension part, 315-second bayonet,

[0041] 32-first spring piece, 321-second spring piece, 322-connecting piece, 323-first bayonet, 324-first bayonet protrusion,

[0042] 33- third spring leaf,

[0043] 40-Protective cover,

[0044] 41-round hole. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] Example 1

[0049] The present invention discloses an anti-shake motor, which is improved on the basis of the existing single-axis focus motor 10 so that the motor can not only move in the Z-axis direction for focusing, but also move in the X / Y axis for shake correction.

[0050] Reference Figures 1 to 4As shown, the anti-shake motor specifically includes a single-axis focus motor 10, which includes a focus coil 11 and a permanent magnet 12. The focus coil 11 can generate magnetic induction with the permanent magnet 12 to drive the single-axis focus motor 10 to move and focus along the Z axis, wherein the number of the permanent magnets 12 is four, which are respectively located at the four corners of the single-axis focus motor 10 and are rotationally symmetrical about the center of the single-axis focus motor 10, and the focus coil 11 is located on the inner side of the permanent magnet 12;

[0051] Reference Figures 1 to 5 As shown, a translational force structure 20 is coaxially arranged with the single-axis focus motor 10, and the translational force structure 20 includes an upper base 21 and a lower base 22 that are assembled and fixed up and down, and a flexible circuit board 23 installed between the upper base 21 and the lower base 22. The upper base 21 is provided with four clearance holes 211 that are rotationally symmetrical about the center of the translational force structure 20, and the four clearance holes 211 are respectively located at the four corners of the upper base 21, and the lower base 22 is provided with translation coils 221 at positions corresponding to the clearance holes 211. The translation coils 221 are electrically connected with the flexible circuit board 23, and the translation coils 221 extend out of the upper base 21 through the clearance holes 211 and are located one-to-one below the permanent magnets 12.

[0052] Among them, refer to Figures 5 to 8 As shown, the lower base 22 is provided with four winding posts 222 for facilitating the winding of the translation coil 221 and a fixed post 223 for assisting the winding. The four winding posts 222 are arranged in one-to-one correspondence with the positions of the translation coil 221. The flexible circuit board 23 has a second clearance hole 231 and a third clearance hole 232 corresponding to the winding posts 222 and the fixed post 223. When winding, the flexible circuit board 23 is first assembled and fixed to the lower base 22. At this time, the winding post 222 and the fixed post 223 extend out of the surface of the flexible circuit board 23 through the second clearance hole 231 and the third clearance hole 232 respectively, the starting end of the wire is fixed on the fixed post 223, and the coils are wound on the four winding posts 222 in a clockwise or counterclockwise direction to form four translation coils 221 (the end end of the wire is also fixed on the fixed post 223). Figure 7 As shown, finally, the redundant wires between two adjacent translation coils 221 are cut off and the ends of each translation coil 221 are welded and fixed on the flexible circuit board 23, as shown in FIG. Figure 8 As shown, this winding method realizes the integrated winding of four translation coils 221, which is convenient, fast and efficient, with high coil density (good density) and good use effect. It effectively solves the problems of poor magnetic density of etching coils / direct winding with copper wire, long process, low efficiency and complex production.

[0053] Reference Figures 2 to 5 , Figures 9 and 10As shown, a suspension structure 30 can be elastically deformed in both the X / Y axis directions. The suspension structure 30 is fixedly connected to the single-axis focus motor 10 and the translational force structure 20. The single-axis focus motor 10 is suspended above the translational force structure 20 through the suspension structure 30. The translation coil 221 of the translational force structure 20 can generate magnetic induction with the permanent magnet 12 to drive the single-axis focus motor 10 to move along the X-axis and / or Y-axis to achieve shake compensation correction, thereby achieving stable shooting of the picture in this way of shake compensation. Among them, the suspension setting of the single-axis focus motor 10 does not cause friction with other components when it moves along the X-axis / Y-axis, thereby reducing energy consumption and making the entire device more efficient;

[0054] Reference Figure 1 to Figure 2 As shown, a protective cover 40 assembled and matched with the translational power structure 20 is also included to protect the entire motor to avoid accidental damage, wherein a circular hole 41 corresponding to the middle of the single-axis focusing motor 10 is provided in the middle of the protective cover 40.

[0055] Reference Figures 2 to 3 , Figure 5 , Figures 9 to 11 As shown, the suspension structure 30 includes a plurality of suspension units 31, each of which is fixedly connected to the single-axis focus motor 10 and the translational power structure 20. Specifically, there are four suspension units 31, and the four suspension units 31 are arranged around the outer peripheral side of the permanent magnet 12. The suspension unit 31 is L-shaped, and its bending part is arranged corresponding to the corner of the single-axis focus motor 10. The two ends are a first fixed end 311 and a second fixed end 312 which are respectively fixedly connected to the single-axis focus motor 10 and the balanced power structure. In this way, the assembly of the entire suspension unit 31 is convenient and quick (the first fixed end 311 and the second fixed end 312 are respectively fixedly connected to the single-axis focus motor 10 and the balanced power structure). Among them, the first fixed end 311 and the second fixed end 312 are respectively extended downward to provide a first extension portion 313 and a second extension portion 314. When the suspension unit 31 is installed and fixed, the first extension portion 313 and the second extension portion 314 are respectively fixedly connected to the single-axis focus motor 10 and the translational force structure 20. The extension length of the second extension portion 314 is greater than the extension length of the first extension portion 313, so that the suspension of the single-axis focus motor 10 is more stable. In addition, the suspension unit 31 is provided with a second bayonet 315 with an opening facing downward at a position close to the second fixed end 312, and the upper base 21 is correspondingly provided with a second latch 212 that matches and engages with the second bayonet 315.

[0056] The suspension unit 31 is arranged rotationally symmetrically about the center of the single-axis focus motor 10, so that the elastic coefficient of the single-axis focus motor 10 is consistent when it translates in the X-axis / Y-axis direction, thereby ensuring the accuracy of the movement of the single-axis focus motor 10 and thus ensuring the effect of shake correction.

[0057] The elastic coefficient of the suspension unit 31 in the X-axis and Y-axis directions is adjustable. Specifically, the suspension structure 30 is composed of a vertical spring sheet. The elastic coefficient of the spring sheet is adjusted by punching holes in the spring sheet. The shape of the hole is not fixed, and the number of holes is determined according to actual needs and is not limited here. Fig.11 As shown, it is a schematic diagram of a punching method of a spring sheet. Specifically, after punching, the elastic coefficient of the spring sheet becomes smaller (the spring sheet becomes softer). In this way, when the lens to be carried is large (the lens is heavy), the elastic coefficient in the X-axis and Y-axis directions can be reduced by punching holes in the spring sheet to reduce the driving force required when the single-axis focus motor 10 moves in the X-axis / Y-axis direction, thereby reducing energy consumption, that is, under the same conditions, the suspension unit 31 can bear and drive a heavier lens. In addition, because the spring sheet is arranged vertically, the bearing performance in the Z-axis direction remains basically unchanged or changes very little after the spring sheet is punched, that is, the elastic coefficient of the single-axis focus motor 10 moving in the X / Y-axis direction and the bearing performance in the Z-axis direction are separately debugged, and the adjustments do not affect each other, thereby laying a foundation for the entire motor to be able to carry larger and heavier lenses and achieve anti-shake (to carry a large lens, the elastic coefficient of the suspension structure 30 in the X / Y-axis direction needs to be reduced, but the bearing capacity in the Z-axis direction needs to be improved).

[0058] Reference Figures 9 and 10 As shown, one specific implementation of the suspension unit 31 is: it includes a first spring sheet 32, a second spring sheet 321, and a connecting piece 322 that connects and fixes the first spring sheet 32 ​​and the second spring sheet 321 to make the suspension unit 31 as a whole L-shaped, and the ends where the first spring sheet 32, the second spring sheet 321 and the connecting piece 322 are connected and fixed are all provided with a first bayonet 323 with an opening facing downward, and the connecting piece 322 is correspondingly provided with two first latching protrusions 324 that match and engage with the first bayonet 323, so that the entire suspension unit 31 is easy to install, wherein the other end of the first spring sheet 32 ​​is the first fixed end 311, and the other end of the second spring sheet 321 is the second fixed end 312.

[0059] In this embodiment, the flexible circuit board 23, the second fixed end 312, the first fixed end 311, and the focus coil 11 are electrically connected in sequence, so that the current entering from the external terminal of the flexible circuit board 23 is finally conducted to the inside of the single-axis focus motor 10. Among them, the second extension part 314 is welded and fixed to the flexible circuit board 23 to achieve the conduction between the second fixed end and the flexible circuit board 23. In particular, if the single-axis focus motor 10 is an open-loop motor, the second extension parts 314 on the two suspension units 31 are electrically connected to the flexible circuit board 23. If the single-axis focus motor 10 is a closed-loop motor with a built-in Hall element, the second extension parts 314 of the four suspension units 31 need to be electrically connected to the flexible circuit board 23; and the connector 322 can be an injection molded part or a metal part. When the connector 322 is an injection molded part, a conductive medium is added to the connector 322 to achieve electrical conduction between the second fixed end 312 and the first fixed end 311.

[0060] When the gyroscope in the mobile phone detects lens shake, it generates a corresponding signal and transmits it to the anti-shake motor. Through the magnetic induction driving action of the translation coil 221 and the permanent magnet 12, the single-axis focus motor 10 moves along the X-axis and / or Y-axis to compensate for the displacement of the shake. When the Hall element in the flexible circuit board 23 detects that the compensating displacement of the single-axis focus motor 10 has achieved shake correction, the single-axis focus motor 10 stops moving, thereby achieving the anti-shake effect of the motor.

[0061] Example 2

[0062] Reference Figure 6 to Figure 7 As shown, the difference between this embodiment and embodiment 1 mainly lies in the structure of the suspension unit 31, and the other structures and components of the motor are the same. Figures 8 to 9 As shown, in this embodiment, the suspension unit 31 includes a third spring piece 33 in a long strip shape, and the third spring piece 33 is integrally bent into an L shape, that is, one suspension unit 31 is formed by directly bending one spring piece integrally, and the structures of the first fixed end 311, the second fixed end 312, the first extension part 313, the second extension part 314, and the second clamping protrusion 212 of the suspension unit 31 are consistent with the design in Example 1. In this embodiment, a bent third spring piece 33 is used to replace the structure in Example 1 where the first spring piece 32 and the second spring piece 321 are connected by a connecting member 322, so that the suspension unit 31 is easily mass-produced and quickly produced.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anti-shake motor, characterized in that: The invention comprises a single-axis focus motor, a translational force structure coaxially arranged with the single-axis focus motor, and a suspension structure capable of elastic deformation in both the X-axis and Y-axis directions. The single-axis focus motor comprises a focus coil and a permanent magnet. The focus coil can generate magnetic induction with the permanent magnet to drive the single-axis focus motor to move and focus along the Z-axis. The suspension structure is fixedly connected to the single-axis focus motor and the translational force structure. The single-axis focus motor is suspended above the translational force structure through the suspension structure. The translational force structure comprises a translation coil. The translation coil can generate magnetic induction with the permanent magnet to drive the single-axis focus motor to move along the X-axis and / or the Y-axis to achieve shake correction. Wherein, the suspension structure includes a plurality of suspension units formed by vertical spring sheets, and each suspension unit is fixedly connected to the single-axis focus motor and the translational force structure; Wherein, the plurality of suspension units are arranged rotationally symmetrically about the center of the single-axis focus motor; There are four suspension units, which are arranged around the outer periphery of the permanent magnet. The suspension unit is L-shaped, and its bending part is arranged corresponding to the corner of the single-axis focus motor. The two ends are a first fixed end and a second fixed end respectively fixed to the single-axis focus motor and the balance power structure. The suspension unit comprises a first spring sheet, a second spring sheet, and a connecting piece that connects and fixes the first spring sheet and the second spring sheet so that the suspension unit is L-shaped as a whole. The ends of the first spring sheet, the second spring sheet and the connecting piece that are connected and fixed are each provided with a first bayonet opening facing downward, and the connecting piece is correspondingly provided with two first bayonet protrusions that match and engage with the first bayonet. Wherein, the suspension unit comprises a third spring piece in a long strip shape, and the third spring piece is integrally bent into an L shape; There are four permanent magnets, which are respectively located at four corners of the single-axis focus motor and are rotationally symmetrical about the center of the single-axis focus motor, and the focus coil is located inside the permanent magnets; Wherein, the translational force structure comprises an upper base and a lower base which are assembled and fixed up and down, and a flexible circuit board installed between the upper base and the lower base, the upper base is provided with four clearance holes which are rotationally symmetrical about the center of the translational force structure, the four clearance holes are respectively located at the four corners of the upper base, the translation coil is located at the lower base and is arranged one-to-one with the clearance holes, the translation coil extends out of the upper base through the clearance holes and is one-to-one correspondingly located below the permanent magnet; The lower base is provided with four winding posts for facilitating the winding of the translation coil and a fixed post for assisting the winding, the four winding posts are arranged in one-to-one correspondence with the positions of the translation coil, and the flexible circuit board has a second clearance hole and a third clearance hole corresponding to avoiding the winding posts and the fixed post; Wherein, the flexible circuit board, the second fixed end, the first fixed end, and the focusing coil are electrically connected in sequence; Wherein, the translation coil is electrically connected to the flexible circuit board; The anti-shake motor further comprises a protective cover assembled and matched with the translational force structure, for protecting the entire motor to avoid accidental damage, wherein a circular hole is provided in the middle of the protective cover corresponding to the middle of the single-axis focus motor; Wherein, the suspension unit is provided with a second bayonet opening facing downward at a position close to the second fixed end, and the upper base is correspondingly provided with a second bayonet protrusion matching and engaging with the second bayonet opening; Wherein, the elastic coefficient of the suspension unit in the X-axis and Y-axis directions is adjustable, and the elastic coefficient of the spring sheet is adjusted by drilling holes in the vertical spring sheet; Among them, the first fixed end and the second fixed end are respectively extended downward to provide a first extension part and a second extension part. When the suspension unit is installed and fixed, the first extension part and the second extension part are respectively fixedly connected to the single-axis focus motor and the translational force structure. The extension length of the second extension part is greater than the extension length of the first extension part. The second extension part is welded and fixed to the flexible circuit board to achieve conduction between the second fixed end and the flexible circuit board.

Images