Af motor, camera module and electronic device

Abstract

The present disclosure relates to an AF motor, a camera module and an electronic device. The AF motor comprises a base, a carrier, an SMA driving part for driving the carrier to move from a second side to a first side, a reset part for resetting the carrier from the first side to the second side, and a guide support part for extending between the first side and the second side to support the carrier in a guide manner. The SMA driving part is connected between the base and the carrier and is configured to contract after being powered on to drive the carrier to move from the second side to the first side. The reset part comprises a first magnetic part arranged on the base and a second magnetic part arranged on the carrier. The first magnetic part and the second magnetic part are arranged oppositely, and the second magnetic part is arranged eccentrically towards the first side relative to the first magnetic part. The guide support part is arranged on the same side as the reset part, so that the base and the carrier are tightly attached to the guide support part by the magnetic attraction force generated between the first magnetic part and the second magnetic part towards each other. The SMA driving part cooperates with the reset part to realize the movement of the carrier in two directions.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of camera technology, in particular to an AF motor, a camera module and an electronic device. BACKGROUND

[0002] In related technologies, the driving mode of the motor in the camera module has a voice coil driving mode and an SMA driving mode. The SMA driving mode usually has two groups to drive in two opposite directions. For example, Chinese Patent Application 201922226680.X provides a camera module, which includes a first SMA actuator and a second SMA actuator, both of which are used to drive in opposite directions to further realize the focusing function. However, this driving mode needs to control two groups of SMA with different driving directions at the same time, resulting in a complex control process and high control cost. SUMMARY

[0003] The purpose of the present disclosure is to provide an AF motor, a camera module and an electronic device to at least partially solve the technical problems existing in related technologies.

[0004] To achieve the above-mentioned purpose, the present disclosure provides an AF motor, which includes a base, a carrier, an SMA driving part for driving the carrier to move from a second side to a first side, a reset part for resetting the carrier from the first side to the second side, and a guide support part for extending between the first side and the second side to support the carrier, the SMA driving part is connected between the base and the carrier and is configured to contract after being powered on to drive the carrier to move from the second side to the first side, the reset part includes a first magnetic part arranged on the base and a second magnetic part arranged on the carrier, the first magnetic part and the second magnetic part are oppositely arranged, and the second magnetic part is eccentrically arranged relative to the first magnetic part towards the first side, the guide support part is arranged on the same side as the reset part, so that the base and the carrier are tightly attached to the guide support part by the magnetic attraction force generated between the first magnetic part and the second magnetic part towards each other.

[0005] Optionally, the magnetic attraction force generated by the first magnetic part towards the second side relative to the second magnetic part is configured to be not less than the gravity of the moving part, and the moving part includes the carrier and a device mounted on the carrier.

[0006] Optionally, the SMA driving part includes a V-shaped SMA wire configured with an opening towards the first side, two vertices of the V-shaped SMA wire are connected with first and second protrusions at both ends of the base, and a bottom point of the V-shaped SMA wire is connected with a hooking part in the middle of the carrier.

[0007] Optionally, the SMA driving part comprises a first SMA wire and a second SMA wire arranged on the same side, and the first SMA wire and the second SMA wire are connected at two pairs of oblique diagonals formed by the base and the carrier on the corresponding side respectively.

[0008] Optionally, the orthographic projections of the first SMA wire and the second SMA wire towards the first side or the second side are parallel to each other and have a spacing, and the first SMA wire and the second SMA wire have the same size.

[0009] Optionally, the first SMA wire is connected to a first protruding part on the base through a first clamping piece, and is connected to a mounting piece on the carrier through a second clamping piece, the second SMA wire is connected to a second protruding part on the base through a third clamping piece, and is connected to the mounting piece through a fourth clamping piece, the first protruding part and the second protruding part are arranged at two ends of the base respectively, and the third clamping piece and the fourth clamping piece are arranged at two ends of the mounting piece respectively.

[0010] Optionally, the third clamping piece is arranged outside the first clamping piece relative to the carrier, the mounting piece comprises a first extending piece extending outwardly from the carrier at one end and a second extending piece extending outwardly from the carrier at the other end, the first extending piece is used for mounting the second clamping piece, the second extending piece is used for mounting the fourth clamping piece, and the extension length of the second extending piece is longer than that of the first extending piece.

[0011] Optionally, the SMA driving part comprises an SMA wire hooked into an X shape, the base is provided with flush first and second mounting points at two ends, the carrier is provided with flush third and fourth mounting points at two ends, the first mounting point and the third mounting point are configured to be oblique diagonals, the second mounting point and the fourth mounting point are configured to be oblique diagonals, the SMA wire is connected to the first mounting point, the third mounting point, the fourth mounting point and the second mounting point in sequence, and the SMA wire is short-circuited at the third mounting point and the fourth mounting point.

[0012] Optionally, the guide support part comprises a first guide support part and a second guide support part arranged at two ends of the carrier on the same side,

[0013] The first guide support part comprises a sliding shaft extending along the movement direction of the carrier or a ball row arranged along the movement direction, when the first guide support part comprises the ball row, the first guide support part is rollably arranged between the base and the carrier, or the first guide support part is fixed to the base or the carrier,

[0014] The second guiding support part comprises one of a ball, a slide shaft extending in the movement direction, and a ball row arranged in the movement direction, and when the second guiding support part comprises the ball or the ball row, the second guiding support part is rollably arranged between the base and the carrier, or the second guiding support part is fixed to the base or the carrier.

[0015] Optionally, the first guiding support part is supported by a first V-shaped groove formed on the carrier and a second V-shaped groove formed on the base.

[0016] The second guiding support part is supported by a square groove formed on the base and capable of accommodating the second guiding support part, and a flat surface of the carrier; or

[0017] When the second guiding support part comprises the slide shaft extending in the movement direction or the ball row arranged in the movement direction, the second guiding support part is supported by a third V-shaped groove formed on the base and a flat surface of the carrier.

[0018] Optionally, the first guiding support part is supported by two first slide shafts arranged side by side on the carrier and two second slide shafts arranged side by side on the base, and when the second guiding support part comprises the slide shaft extending in the movement direction or the ball row arranged in the movement direction, the second guiding support part is supported by two third slide shafts arranged side by side on the base and a flat surface of the carrier.

[0019] Optionally, the AF motor further comprises a position sensor for detecting the relative position of the base and the carrier, and the position sensor is electrically connected with the power supply element, wherein the position sensor comprises a magnetic field sensor, an electric field sensor, or an optoelectronic position sensor.

[0020] Optionally, the position sensor comprises a magnetic field sensor arranged on one of the carrier and the base, and the other of the carrier and the base is provided with a magnet opposite to the magnetic field sensor, and the position sensor is capable of sensing the position information of the magnet.

[0021] Optionally, the magnet is configured as the first magnetic member or the second magnetic member.

[0022] According to a second aspect of the present disclosure, a camera module is also provided, comprising an optical device and the AF motor provided by the present disclosure.

[0023] According to a third aspect of the present disclosure, an electronic device is also provided, comprising the camera module provided by the present disclosure.

[0024] By the technical solution, the AF motor in the embodiment of the present disclosure realizes the movement of the carrier in two directions through the magnetic attraction of the driving cooperation reset part of the first side to the second side by the SMA driving part of the first side, simplifies the control process of the SMA driving part, and saves the control cost. In addition, the two magnetic parts of the reset part are eccentrically arranged, and the first magnetic part always has a magnetic attraction to the second magnetic part on the second side, so that the carrier can have a tendency to approach the base on the second side in the non-working state, avoiding the shaking and abnormal sound of the carrier. And the guide support part can guide the precise movement direction of the carrier under the magnetic attraction of the first magnetic part and the second magnetic part towards each other.

[0025] Other features and advantages of the present disclosure will be described in detail in the following specific embodiment part. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following specific embodiments to explain the present disclosure, but do not constitute a limitation on the present disclosure. In the drawings:

[0027] Figure 1 is an exploded schematic view of the AF motor provided by an exemplary embodiment of the present disclosure.

[0028] Figure 2 is a partial top view of the AF motor provided by an exemplary embodiment of the present disclosure.

[0029] Figure 3 is a connection schematic diagram of the SMA wire provided by an exemplary embodiment of the present disclosure.

[0030] Figure 4 is a connection schematic diagram of the SMA wire provided by another exemplary embodiment of the present disclosure.

[0031] Figure 5 is a partial structure schematic diagram of the AF motor provided by an exemplary embodiment of the present disclosure.

[0032] Figure 6 is an exploded schematic view of the AF motor provided by an exemplary embodiment of the present disclosure.

[0033] Figure 7 is a partial structure schematic diagram of the AF motor provided by an exemplary embodiment of the present disclosure.

[0034] Figure 8 is a partial structure schematic diagram of the AF motor provided by an exemplary embodiment of the present disclosure.

[0035] Figure 9 is a schematic view of the first guide support part provided by an exemplary embodiment of the present disclosure.

[0036] Figure 10 is a schematic view of a first guide support part provided by another example embodiment of the present disclosure.

[0037] Figure 11 is a schematic view of a second guide support part provided by an example embodiment of the present disclosure.

[0038] Figure 12 is a schematic view of a second guide support part provided by another example embodiment of the present disclosure.

[0039] Figure 13 is a schematic view of a second guide support part provided by another example embodiment of the present disclosure.

[0040] Figure 14 is a schematic view of a second guide support part provided by another example embodiment of the present disclosure.

[0041] Figure 15 is a partial sectional view of an AF motor provided by an example embodiment of the present disclosure.

[0042] Figure 16 is a partial sectional view of an AF motor provided by an example embodiment of the present disclosure.

[0043] Figure 17 is a schematic view of an image pickup module provided by an example embodiment of the present disclosure.

[0044] Figure 18 is a schematic view of an electronic device provided by an example embodiment of the present disclosure.

[0045] BRIEF DESCRIPTION OF DRAWINGS

[0046] 1 - AF motor, 10 - base, 100 - housing, 11 - first protruding part, 12 - second protruding part, 13 - second V-shaped groove, 14 - third V-shaped groove, 15 - square groove, 20 - carrier, 21 - mounting piece, 211 - first extension piece, 212 - second extension piece, 22 - hooking part, 23 - first V-shaped groove, 30 - SMA driving part, 31 - first SMA wire, 301 - conductive connecting piece, 311 - first clamping piece, 3111 - first conductive piece, 3112 - first pin, 312 - second clamping piece, 32 - second SMA wire, 321 - third clamping piece, 3211 - second conductive piece, 3212 - second pin, 322 - fourth clamping piece, 41 - first magnetic piece, 42 - second magnetic piece, 50 - guide support part, 51 - first guide support part, 52 - second guide support part, 53 - first sliding shaft, 54 - second sliding shaft, 55 - third sliding shaft, 61 - magnet, 62 - position sensor, 63 - circuit board, 2 - optical device, 3 - image pickup module, 4 - electronic device. DETAILED DESCRIPTION

[0047] The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to explain and illustrate the present disclosure, and are not intended to limit the present disclosure.

[0048] In the present disclosure, the orientation words such as "upper", "lower", "top", "bottom" are used for the convenience of description and definition, and can be combined with the directions of the drawings, and in the drawings, the first side is the upper and top, the second side is the lower and bottom, and "inner" and "outer" refer to the inner and outer of the contour of the corresponding parts. The terms such as "first", "second" used in the present disclosure are used to distinguish one element from another element, and do not have sequential and important meanings. In addition, the following description refers to the drawings, and unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. Figure 5 Figure 1 In the present disclosure, the orientation words such as "upper", "lower", "top", "bottom" are used for the convenience of description and definition, and can be combined with the directions of the drawings, and in the drawings, the first side is the upper and top, the second side is the lower and bottom, and "inner" and "outer" refer to the inner and outer of the contour of the corresponding parts. The terms such as "first", "second" used in the present disclosure are used to distinguish one element from another element, and do not have sequential and important meanings. In addition, the following description refers to the drawings, and unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0049] With reference to Figure 1 and in combination with Figure 2 and Figure 3 , the present disclosure provides an AF motor for driving an optical device to have a clear imaging effect. Wherein the optical device can include a lens part and a sensor part, the AF motor includes a base 10, a carrier 20, an SMA driving part 30 for driving the carrier 20 to move from the second side to the first side, a reset part for resetting the carrier 20 from the first side to the second side, and a guide support part 50 for extending between the first side and the second side to support and guide the carrier 20. One of the base 10 and the carrier 20 can be used to mount the sensor part, and the other is used to mount the lens part, for example, the sensor part can be mounted on the base 10, and the lens part can be mounted on the carrier 20. The guide support part 50 is used to support and guide the carrier 20 to move between the first side and the second side, so that the movement direction is accurate and the movement process is stable. The SMA driving part 30 is connected between the base 10 and the carrier 20, and is configured to contract after being powered on to drive the carrier 20 to move from the second side to the first side. With reference to Figure 15 ​The reset part includes a first magnetic member 41 arranged on the base 10 and a second magnetic member 42 arranged on the carrier 20. One of the two magnetic members can be a magnet, and the other can be a magnetic conductive sheet, or both of the two magnetic members can be magnets. The first magnetic member 41 and the second magnetic member 42 are oppositely arranged, and the second magnetic member 42 is eccentrically arranged towards the first side relative to the first magnetic member 41. Specifically, in the figure, the second magnetic member 42 is eccentrically arranged upwards relative to the first magnetic member 41, that is, the center of the second magnetic member 42 is closer to the first side than the center of the first magnetic member 41. Thus, the first magnetic member 41 can generate a downward magnetic attraction force on the second magnetic member 42, which is opposite to the upward force of the SMA driving part 30. When the AF motor is working, the SMA driving part 30 is energized to drive the carrier 20 to move upwards against the downward magnetic attraction force. After the AF motor completes the action, the SMA driving part 30 is de-energized, and the downward magnetic attraction force of the reset part drives the carrier 20 to return to the initial position for the next driving action. It should be noted that the driving force of the SMA driving part 30 on the carrier 20 towards the first side can be adjusted by adjusting the current passing through the SMA driving part 30. According to the difference between the driving force of the SMA driving part 30 towards the first side and the force of the reset part towards the second side, the movement stroke and direction of the carrier 20 can be controlled. In other embodiments, the AF motor can further include a shell 100 arranged around the periphery of the base 10, for protecting the carrier 20 and limiting the movement stroke towards the first side.

[0050] With reference to Figure 16 The guide support part 50 can be arranged on the same side as the reset part, that is, the first magnetic member 41 and the second magnetic member 42 can generate magnetic attraction forces towards each other, so that the carrier 20 has a tendency to abut against the guide support part 50, thereby making the base 10 and the carrier 20 abut against the guide support part 50, so that the carrier 20 moves stably. With reference to Figure 16 The first magnetic member 41 and the second magnetic member 42 can be respectively arranged with two groups symmetrically arranged on one side of the AF motor.

[0051] Through the above technical solution, the AF motor in the embodiment of the present disclosure realizes the movement of the carrier 20 in two directions by the driving of the SMA driving part 30 towards the first side and the magnetic attraction force of the reset part towards the second side, simplifies the control process of the SMA driving part 30, and saves the control cost. In addition, the two magnetic members of the reset part are eccentrically arranged, the first magnetic member 41 always has a magnetic attraction force towards the second side to the second magnetic member 42, so that the carrier 20 can have a tendency to approach the base 10 towards the second side in the non-working state, avoiding the shaking and abnormal sound of the carrier 20. Moreover, under the magnetic attraction of the first magnetic member 41 and the second magnetic member 42 towards each other, the guide support part 50 can guide the precise movement direction of the carrier 20.

[0052] In the embodiment of the present disclosure, the magnetic attraction force generated by the first magnetic member 41 to the second magnetic member 42 towards the second side (i.e. the reset force of the carrier 20 to the base 10) can be configured to be not less than the gravity of the moving part, wherein the moving part can include the carrier 20 and all devices mounted on the carrier 20, such as but not limited to the second magnetic member 42, the lens part, and the first sliding shaft 53 and the third sliding shaft 55 described below, etc. The magnetic attraction force is set to be not less than the gravity of the moving part, which can effectively overcome the gravity of the moving part. In the embodiment of the present disclosure, the reset force can be configured to be not less than 1.5 times the gravity of the moving part. When the motor is hit or shaken in any direction, the magnetic attraction force can ensure that the carrier 20 can always be tightly attached to the base 10 towards the second side, thereby effectively avoiding the impact noise that may occur in various situations, avoiding damage to the parts, and improving the service life of the parts.

[0053] In an embodiment, referring to Figure 5 , the SMA driving part 30 can include a V-shaped SMA wire configured to be open towards the first side, two vertices of the V-shaped SMA wire can be connected with the first protruding part 11 and the second protruding part 12 (such as the first protruding part 11 and the second protruding part 12 shown in Figure 2 ) at both ends of the base 10, and the bottom point of the V-shaped SMA wire can be connected with the hooking part 22 in the middle of the carrier 20. The two ends of the SMA wire can be electrically connected through the conductive connecting parts 301 embedded in the protruding parts and the base of the base 10, respectively, so as to be powered by the power supply unit through the conductive connecting parts 301. When the SMA wire is powered, it will shrink due to heat, i.e. the length of the SMA wire connected between the first protruding part 11 and the second protruding part 12 will be shortened. Since the two ends of the SMA wire are fixed, the V-shaped bottom hooked in the hooking part 22 will move upwards to overcome the downward magnetic attraction force of the reset part, thereby driving the carrier 20 to move upwards. During the upward movement of the carrier 20, the included angle of the V-shaped structure becomes larger and larger, until the included angle is 180°, reaching the maximum stroke of the upward movement of the carrier 20. In actual application, the movable range of the carrier 20 can be adjusted according to the shrinkage of the SMA wire and by adjusting the included angle of the V-shaped structure. The downward movement of the carrier 20 after the upward movement can be achieved by reducing the current flowing through the SMA wire to make the carrier 20 move downwards to the specified position under the magnetic attraction of the reset part, or by powering off the SMA wire to make the carrier 20 return to the initial position under the action of the reset part. The hooking part 22 can be arranged in the middle of the first protruding part 11 and the second protruding part 12, so that the SMA wire is configured as a symmetrical structure, thereby ensuring that the movement of the carrier 20 remains balanced and does not sway.

[0054] In an embodiment, referring to Figure 1 , the SMA driving part 30 can include a first SMA wire 31 and a second SMA wire 32 connected between the base 10 and the carrier 20 and arranged on the same side, referring toFigure 2 and Figure 3 The first SMA wire 31 and the second SMA wire 32 are respectively connected at two pairs of diagonal corners formed by the base 10 and the carrier 20 on the corresponding side, and the first SMA wire 31 and the second SMA wire 32 are arranged on the same side in Figure 3 The side where the first SMA wire 31 and the second SMA wire 32 are arranged has four corners, and the first SMA wire 31 is connected between the upper left corner of the base 10 and the lower right corner of the carrier 20, and the second SMA wire 32 is connected between the lower left corner of the carrier 20 and the upper right corner of the base 10, so that the SMA wire can be arranged at the farthest position of the carrier 20, and the length of the SMA wire can be long enough. Specifically, the first SMA wire 31 is heated and shrinks after being powered on, and pulls the carrier 20 from the lower right corner of the carrier 20, and the second SMA wire 32 is heated and shrinks after being powered on, and pulls the carrier 20 from the lower left corner of the carrier 20, and the carrier 20 can be pulled upward at both ends of the bottom of the carrier 20 by the two SMA wires. The driving directions of the two SMA wires are the same, so the current directions and sizes of the two SMA wires can be the same, so that the control process is simpler and the control cost is reduced. In addition, the SMA driving part 30 is arranged at the diagonal corner of the AF motor by using two SMA wires, so that the SMA wire has enough length to provide a larger movement stroke, and the superposition of the two SMA wires can make the carrier 20 move stably without deviation.

[0055] In an embodiment, referring to Figure 2 The orthographic projections of the first SMA wire 31 and the second SMA wire 32 towards the first side or the second side can be configured to be parallel to each other and have a spacing to ensure that they do not interfere with each other. The two SMA wires can be symmetrically arranged to ensure that the movement of the carrier 20 does not deviate.

[0056] In the embodiments of the present disclosure, the first SMA wire 31 and the second SMA wire 32 can have the same size. The pulling force of the first SMA wire 31 on the lower right corner of the carrier 20 is the same as the pulling force of the second SMA wire 32 on the lower left corner of the carrier 20, so as to ensure that the carrier 20 does not deviate or jam.

[0057] Referring to Figure 2 and Figure 3The first SMA wire 31 can be connected to the first protruding part 11 on the base 10 through the first clamping piece 311 to be relatively fixed with the base 10, and connected to the mounting piece 21 on the carrier 20 through the second clamping piece 312 to be relatively fixed with the carrier 20, and the second SMA wire 32 can be connected to the second protruding part 12 on the base 10 through the third clamping piece 321 to be relatively fixed with the base 10, and connected to the mounting piece 21 through the fourth clamping piece 322 to be relatively fixed with the carrier 20. The first protruding part 11 and the second protruding part 12 are respectively arranged at two ends of the base 10, and the third clamping piece 321 and the fourth clamping piece 322 are respectively located at two ends of the mounting piece 21, so as to connect the base 10 and the carrier 20 at the diagonal positions. The heights of the first protruding part 11 and the second protruding part 12 in the up-down direction can be the same, so that the heights of the first clamping piece 311 and the second clamping piece 312 in the up-down direction are the same, and the heights of the third clamping piece 321 and the fourth clamping piece 322 in the up-down direction are also the same, so that the forces of the first SMA wire 31 and the second SMA wire 32 on the carrier 20 are more balanced. Each clamping piece can be a metal clamping piece, which is used to fix the SMA wire and conduct electricity.

[0058] Specifically, referring to Figure 3 , the first clamping piece 311 can be connected to the first conductive part 3111 embedded in the first protruding part 11, and the other end of the first conductive part 3111 can be electrically connected to the circuit board through the first pin 3112 to supply power to the first SMA wire. Similarly, the third clamping piece 321 can be connected to the second conductive part 3211 embedded in the second protruding part 12, and the other end of the second conductive part 3211 can be electrically connected to the circuit board through the second pin 3212 to supply power to the second SMA wire 32.

[0059] Referring to Figure 2 and Figure 16 , the third clamping piece 321 is arranged outside the first clamping piece 311 relative to the carrier 20, so as to Figure 2 , for example, the third clamping piece 321 is below the first clamping piece 311. The mounting piece 21 (hidden in the carrier 20 in Figure 2 ) can include a first extension piece 211 extending outward from one end of the carrier 20 and a second extension piece 212 extending outward from the other end of the carrier 20, the first extension piece 211 is used to mount the second clamping piece 312, and the second extension piece 212 is used to mount the fourth clamping piece 322, and the extension length of the second extension piece 212 is longer than that of the first extension piece 211, so that the SMA wires connected by the two can be spaced apart. Specifically, the length difference between the second extension piece 212 and the first extension piece 211 is equal to the length difference between the third clamping piece 321 and the first clamping piece 311 in Figure 2The distance difference in the up-down direction of the plane makes the two SMA wires parallel to each other without interfering with each other. Among them, the mounting piece 21 can also be mounted in the form of being embedded in the carrier 20.

[0060] In an embodiment, referring to Figure 4 , the SMA driving part 30 can include one SMA wire hooked into an X shape, that is, one SMA wire is wound into the same shape as the arrangement of the above two SMA wires. The two ends of the base 10 can be provided with flush first and second mounting points (that is, the upper left and upper right mounting points for mounting the SMA driving part 30 in Figure 4 ), and the two ends of the carrier 20 can be provided with flush third and fourth mounting points (that is, the lower left and lower right mounting points for mounting the SMA driving part 30 in Figure 4 ), as shown in the figure, the first and third mounting points are diagonally opposite, the second and fourth mounting points are diagonally opposite, the SMA wire is connected to the first mounting point, the third mounting point, the fourth mounting point and the second mounting point in turn, and the SMA wire is short-circuited at the third mounting point and the fourth mounting point. In this way, one SMA wire can achieve the same effect as the above two SMA wires, so it has the same beneficial effects, please refer to the above description, which will not be repeated here.

[0061] In an embodiment, referring to Figure 1 and Figure 16 , the guide support part 50 can include first and second guide support parts 51 and 52 provided at the same side of the two ends of the carrier 20. Among them, in combination with Figure 1 , Figures 5 to 16 , the first guide support part 51 can include a sliding shaft extending in the movement direction of the carrier 20 (that is, the up-down direction of the AF motor) or a ball row arranged in the movement direction. When the first guide support part 51 includes a ball row, it can be rollably provided between the base 10 and the carrier 20; or it can be fixed to one of the base 10 and the carrier 20, and the other one of the base 10 and the carrier 20 can slide relative to the ball row, that is, slide opposite to the ball row, referring to Figure 10 , the ball row composed of two balls is fixed to the base 10, and the carrier 20 slides relative to the ball row. The second guide support part 52 can include one of a ball, a sliding shaft extending in the movement direction, and a ball row arranged in the movement direction. When the second guide support part 52 includes a ball or a ball row, it can be rollably provided between the base 10 and the carrier 20, or it can be fixed to one of the base 10 and the carrier 20, and the other one of the base 10 and the carrier 20 can slide relative to the ball or the ball row, that is, slide opposite to the ball or the ball row, referring to Figure 13 and Figure 14, a ball or a ball row consisting of one or two balls is fixed on the base 10, and the carrier 20 slides relative to the ball or the ball row. For example, the first guide support 51 and the second guide support 52 can be any combination of the above forms, which are not described one by one. Among them, when the guide support 50 includes a ball or a ball row, it has the following advantages: the ball is in point contact with the carrier 20 and the base 10, and when the carrier 20 moves, it generates rolling friction, which does not generate large resistance to the movement of the carrier 20, thereby making the AF motor have larger driving force to adapt to the larger module of the lens part.

[0062] In an embodiment, referring to Figure 7 and Figure 8 , the first guide support 51 can be supported by the first V-shaped groove 23 formed on the carrier 20 and the second V-shaped groove 13 formed on the base 10, that is, the first guide support 51 is clamped by two oppositely arranged V-shaped grooves. In other embodiments, the slide shaft of the first guide support 51 can be fixed by an arc-shaped groove matched therewith and clamped by a V-shaped groove (as shown in Figure 9 ), and the ball row can be fixed by a directional groove matched with each ball and clamped by a V-shaped groove (as shown in Figure 10 ). Figure 8 , the second guide support 52 can be supported by the square groove 15 formed on the base 10 capable of accommodating the second guide support 52 and the plane of the carrier 20. For example, when the second guide support 52 is a ball row or a slide shaft, the square groove 15 can be a groove with a U-shaped cross section extending in the same direction as the second guide support 52. When the second guide support 52 is one or several balls, the square groove 15 can be a groove with only one side open capable of accommodating the ball. Figure 6 and Figure 7 , the second guide support 52 can be supported by the third V-shaped groove 14 formed on the base 10 and the plane of the carrier 20. In this embodiment, the outer circumferential surface of the first guide support 51 is tangent to the inclined surfaces of the two oppositely arranged V-shaped grooves, thereby ensuring that the extension direction of the row of guide supports 50 is unique and stable. The outer circumferential surface of one side of the second guide support 52 can be tangent to the V-shaped groove, and the other side can only be in contact with the plane to play a supporting role. In this way, one of the two groups of guide supports is used for guiding and the other is used for supporting, meeting the demand for stable movement of the carrier 20. In other embodiments, both groups of guide supports can be clamped by opposite V-shaped grooves. In other embodiments, referring to Figure 11 , the slide shaft of the second guide support 52 can be fixed by an arc-shaped groove matched therewith and can be supported by a protrusion protruding from the carrier 20; referring to Figure 12The ball row of the second guiding support part 52 can be provided with a groove structure with a flat groove bottom on the opposite side of the V-shaped groove support.

[0063] In another embodiment, referring to Figure 1 and Figure 16 , the first guiding support part 51 can be supported by two first sliding shafts 53 arranged side by side on the carrier 20 and two second sliding shafts 54 arranged side by side on the base 10, and the second guiding support part 52 can be supported by two third sliding shafts 55 arranged side by side on the base 10 and the plane of the carrier 20 when the second guiding support part 52 includes a sliding shaft or a ball row. That is, in this embodiment, the V-shaped groove formed integrally with the base 10 or the carrier 20 is replaced by two sliding shafts arranged side by side. Here, it should be noted that the V-shaped groove formed by the two sliding shafts arranged side by side is a "V"-shaped groove, as long as the guiding support part 50 is tangent to it. The two sliding shafts arranged side by side can have a spacing therebetween, and the spacing is not greater than the diameter of the ball or sliding shaft of the guiding support part 50, so that the guiding support part 50 can fall as much as possible between the two sliding shafts to prevent it from falling out of the sliding shaft, and also to avoid falling completely between the two sliding shafts so as not to play a supporting guiding role. The sliding shafts can be fixed to the corresponding base 10 or carrier 20 by adhesion or the like. The sliding shafts are supported by metal materials, which have a larger hardness and a smaller friction when in contact with the metal guiding support part 50, and compared with the integral V-shaped groove, the sliding shafts also avoid the formation of a pressure pit on the V-shaped groove when the guiding support part 50 is a ball or a ball row.

[0064] In one embodiment, referring to Figure 15 and Figure 16 , the AF motor can further include a position sensor 62 for detecting the relative position of the base 10 and the carrier 20, the position sensor 62 being electrically connected to the power supply element, for example, being electrically connected to the circuit board 63, and being capable of feeding back the detected position information to the control circuit, so as to control the on-off power supply to the SMA driving part 30, thereby realizing closed-loop control of the driving process of the AF motor. The position sensor 62 can include a magnetic field sensor (such as a Hall sensor), an electric field sensor (such as a capacitive sensor), or an optoelectronic position sensor, etc.

[0065] When the position sensor 62 is a magnetic field sensor, the position sensor 62 can be arranged on one of the carrier 20 and the base 10, and the other can be provided with a magnet 61 opposite the magnetic field sensor, as shown in Figure 15 and Figure 16 . The position sensor 62 is used to sense the position information of the magnet 61, and the position sensor 62 is electrically connected to the circuit board 63.

[0066] The magnet 61 can share the first magnetic member 41 or the second magnetic member 42 described above. For example, in the embodiment of the present disclosure, when the magnet 61 is arranged on the carrier 20, the magnet 61 can share the second magnetic member 42, thereby playing two different roles, avoiding the increase in the number of components due to separate arrangement, and avoiding magnetic interference between each other. The position sensor 62 identifies the movement position of the carrier 20 relative to the base 10 by sensing the magnetic flux of the magnet 61, thereby performing closed-loop control on the driving process of the AF motor. Here, the position sensor 62 can be a Hall sensor, and the magnet 61 can be a Hall magnet. In an embodiment of the present disclosure, the position sensor 62 can be arranged on the base 10, and the magnet 61 can be arranged on the carrier 20, so as to stabilize the electrical connection of the position sensor 62. In the embodiment of the present disclosure, the electrical devices can be arranged on the fixed base 10, so as to ensure the reliable connection of the electrical devices and avoid the short circuit to affect the use performance of the AF motor.

[0067] According to a second aspect of the embodiment of the present disclosure, referring to Figure 17 , a camera module 3 is also provided, which comprises the optical device 2 and the AF motor 1, and the AF motor 1 is the AF motor described above. The camera module 3 has all the beneficial effects of the AF motor described above, which will not be described herein.

[0068] According to a third aspect of the embodiment of the present disclosure, referring to Figure 18 , an electronic device 4 is provided, which comprises the camera module 3 described above and has all the beneficial effects of the camera module 3 described above, which will not be described herein. The electronic device 4 can be a mobile phone, a computer, a tablet computer, a watch, a monitoring device, an AR device, or other devices with imaging functions.

[0069] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0070] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0071] In addition, various different embodiments of the present disclosure can also be combined in any appropriate manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.

Claims

1. An AF motor characterized by, The application relates to a device for driving a carrier, comprising a base, a carrier, an SMA driving part for driving the carrier to move from a second side to a first side, a reset part for resetting the carrier from the first side to the second side, and a guide support part for extending between the first side and the second side to support and guide the carrier, the SMA driving part is connected between the base and the carrier and is configured to contract after being powered to drive the carrier to move from the second side to the first side, the SMA driving part comprises an SMA wire, the reset part comprises a first magnetic part arranged on the base and a second magnetic part arranged on the carrier, the first magnetic part and the second magnetic part are oppositely arranged, and the second magnetic part is eccentrically arranged towards the first side relative to the first magnetic part, the guide support part is arranged on the same side as the reset part, so that the base and the carrier are close to the guide support part through the magnetic attraction force generated between the first magnetic part and the second magnetic part, the magnetic attraction force generated by the first magnetic part on the second magnetic part towards the second side is not less than the gravity of the moving part, the moving part comprises the carrier and a device for mounting on the carrier, The guide support part comprises a first guide support part and a second guide support part arranged at two ends of the carrier on the same side, The first guide support part comprises a sliding shaft extending along the movement direction of the carrier or a ball row arranged along the movement direction, when the first guide support part comprises the ball row, the first guide support part is rollably arranged between the base and the carrier, or the first guide support part is fixed to the base or the carrier, The second guide support part comprises one of a ball, a sliding shaft extending along the movement direction and a ball row arranged along the movement direction, when the second guide support part comprises the ball or the ball row, the second guide support part is rollably arranged between the base and the carrier, or the second guide support part is fixed to the base or the carrier, The first guide support part is supported by a first V-shaped groove formed on the carrier and a second V-shaped groove formed on the base, The second guide support part is supported by a square groove capable of accommodating the second guide support part formed on the base and a plane of the carrier; or When the second guide support part comprises a sliding shaft extending along the movement direction or a ball row arranged along the movement direction, the second guide support part is supported by a third V-shaped groove formed on the base and a plane of the carrier.

2. The AF motor of claim 1, wherein The SMA driving part comprises a V-shaped SMA wire configured as an opening towards the first side, two vertices of the V-shaped SMA wire are connected with first and second protruding parts at two ends of the base, and a bottom point of the V-shaped SMA wire is connected with a hooking part in the middle of the carrier.

3. The AF motor of claim 1, wherein The SMA driving part comprises first and second SMA wires arranged on the same side, and the first and second SMA wires are respectively connected at two pairs of diagonal corners formed by the base and the carrier on the corresponding side.

4. The AF motor of claim 3, wherein The first SMA wire and the second SMA wire are parallel to each other and have a spacing in the direction of the first side or the second side, and the first SMA wire and the second SMA wire have the same size.

5. The AF motor of claim 3, wherein The first SMA wire is connected to the first protruding part on the base through a first clamping piece and connected to the mounting piece on the carrier through a second clamping piece, the second SMA wire is connected to the second protruding part on the base through a third clamping piece and connected to the mounting piece through a fourth clamping piece, the first protruding part and the second protruding part are respectively arranged at both ends of the base, and the third clamping piece and the fourth clamping piece are respectively located at both ends of the mounting piece.

6. The AF motor of claim 5, wherein The third clamping piece is arranged outside the first clamping piece relative to the carrier, the mounting piece includes a first extension piece extending outward from the carrier at one end and a second extension piece extending outward from the carrier at the other end, the first extension piece is used for mounting the second clamping piece, and the second extension piece is used for mounting the fourth clamping piece, and the extension length of the second extension piece is longer than the extension length of the first extension piece.

7. The AF motor of claim 1, wherein The SMA driving part includes an SMA wire hooked into an X shape, the base is provided with flush first and second mounting points at both ends, the carrier is provided with flush third and fourth mounting points at both ends, the first and third mounting points are diagonally opposite, the second and fourth mounting points are diagonally opposite, the SMA wire is connected to the first, third, fourth and second mounting points in sequence, and the SMA wire is short-circuited at the third and fourth mounting points.

8. The AF motor of claim 1, wherein The first guide support part is supported by two first sliding shafts arranged side by side on the carrier and two second sliding shafts arranged side by side on the base, and when the second guide support part includes a sliding shaft extending in the movement direction or a ball row arranged in the movement direction, the second guide support part is supported by two third sliding shafts arranged side by side on the base and the plane of the carrier.

9. The AF motor of claim 1, wherein The AF motor further includes a position sensor for detecting the relative position of the base and the carrier, and the position sensor is electrically connected with a power supply element, wherein the position sensor includes a magnetic field sensor, an electric field sensor, or an optoelectronic position sensor.

10. The AF motor of claim 9, wherein The position sensor includes a magnetic field sensor arranged on one of the carrier and the base, and the other of the carrier and the base is provided with a magnet opposite the magnetic field sensor, and the position sensor can sense the position information of the magnet.

11. The AF motor of claim 10, wherein The magnet is configured as the first magnetic member or the second magnetic member.

12. An image capture module, comprising: An imaging module including the optical device and the AF motor according to any one of claims 1-11.

13. An electronic device, comprising: An imaging module including the AF motor according to claim 12.

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