Patent Description:
This application relates to the field of mobile terminal technologies, and in particular, to a driving apparatus, a camera module, and an electronic device.

In life, people often use electronic devices (such as smartphones and tablet computers) for photographing, and photographing quality of the electronic devices has become one of important standards for measuring performance of terminal devices.

Using a camera in a mobile phone as an example, a driving apparatus is usually provided in the camera, and the driving apparatus drives a lens or image sensor of the camera to move. For example, the driving apparatus drives the lens to move in a direction of an optical axis of the lens to implement a focusing function of the lens; or the driving apparatus drives the lens or the image sensor to move in a plane perpendicular to the direction of the optical axis of the lens, so as to implement an anti-shake function of the camera. Nowadays, with increasing requirements for mobile phone cameras and increasing requirements for optical performance, a higher demand is put forward on a stroke range of the driving apparatus.

However, because a structure and a driving mode of the driving apparatus are limited, a stroke of the driving apparatus is small, and a requirement for large-stroke driving cannot be met.

<CIT> discloses a miniature optical anti-shake module and a camera module with the same. The Z-axis driving burden is small and SMA drive components have a large driving force.

<CIT> discloses an SMA actuator, which is especially suitable for constructing a lens driving device, which realizes the automatic focusing and anti-shake of the camera and meets the requirements of product miniaturization.

<CIT>discloses an apparatus for compensating for vibration of an image capturing device. The apparatus includes a y-axis stage installed in a support structure so as to be movable in y-axis direction. An x-axis stage is installed on the y-axis stage so as to be movable in x-axis direction on an x plane. An image sensor is mounted on the x-axis stage. The apparatus is provided with a y-axis driver and an x-axis driver for driving the y-axis stage in the y-axis direction and the x-axis stage in the x-axis direction respectively. A control unit is installed in the image capturing device. The control unit operates to sense vibration of the image capturing device through a separate vibration sensor and to drive the y-axis driver and the x-axis driver to vibrate the image sensor in a way to compensate for the vibration of image capturing device.

In a first aspect of the present invention, there is provided a driving apparatus according to claim <NUM>. In a second aspect of the present invention, there is provided a camera module according to claim <NUM>.

Embodiments of this application provide a driving apparatus, a camera module, and an electronic device, where the driving apparatus has a large stroke range, which can improve optical performance of the camera module and optimize service performance of the electronic device.

According to a first aspect, this application provides a driving apparatus for driving a lens of a camera module to move, including a bearing member and a driving structure, where the lens is fixed to the bearing member, and the driving structure includes a guide member, a fixing member, and at least two groups of driving assemblies; and the guide member and the fixing member are sequentially arranged on a light outlet side of the lens in a direction of an optical axis of the lens;.

The driving apparatus according to this application is configured to drive the lens to move in a plane perpendicular to the direction of the optical axis of the lens, so as to implement an anti-shake function of the lens. The driving apparatus includes the bearing member and the driving structure, where the lens is fixed to the bearing member, and the driving structure includes the guide member, the fixing member, and the at least two groups of driving assemblies. At least one group of driving assemblies is arranged between the fixing member and the guide member, and at least one group of driving assemblies is arranged between the guide member and the bearing member, so that the driving assemblies between the fixing member and the guide member drive the guide member to move in the first direction, the driving assemblies between the guide member and the bearing member drive the bearing member to move in the second direction, and an included angle is formed between the first direction and the second direction to drive the lens to move arbitrarily in a plane where the bearing member is located. The elastic rod and the SMA wire are used as one driving assembly, and the SMA wire expands or contracts to drive an end of the elastic rod to bend and deform, and the bending deformation of the end of the elastic rod generates displacement to drive the guide member or the bearing member to move. The end of the elastic rod generates larger bending deformation, which can increase a movement amount of the SMA wire, increase a stroke range of the driving apparatus, and improve anti-shake precision of the lens and optical performance of the camera module.

In a possible implementation, a first driving assembly is connected between the fixing member and the guide member, the first driving assembly includes a first elastic rod and a first shape memory alloy wire, two ends of the first elastic rod are connected to the fixing member and the guide member respectively, and the first shape memory alloy wire is connected between the fixing member and the first elastic rod; and
a second driving assembly is connected between the guide member and the bearing member, the second driving assembly includes a second elastic rod and a second shape memory alloy wire, two ends of the second elastic rod are connected to the guide member and the bearing member respectively, and the second shape memory alloy wire is connected between the guide member and the second elastic rod.

In a possible implementation, the first driving assembly and the second driving assembly are located on different sides of the fixing member respectively, and an extension direction of the first driving assembly and an extension direction of the second driving assembly are staggered.

Through staggering of the first driving assembly and the second driving assembly, the extension direction of the first elastic rod and the extension direction of the second elastic rod are staggered, and the first elastic rod and the second elastic rod drive the guide member and the bearing member respectively to move in different directions, so that the guide member moves in the first direction, and the bearing member moves in the second direction.

In a possible implementation, the first driving assembly and the second driving assembly are located on two adjacent sides of the fixing member respectively.

In a possible implementation, the elastic rod extends along a side wall of the fixing member, and the deformed end of the elastic rod is connected to a corner of the guide member or a corner of the bearing member.

The deformed end of the elastic rod is connected to the corner of the guide member (the corner of the bearing member), so that the elastic rod drives the corner of the guide member (the corner of the bearing member) to move, thereby improving flexibility of movement of the guide member and the bearing member.

In a possible implementation, two ends of the elastic rod extend to two ends of the side wall of the fixing member respectively.

The two ends of the elastic rod extend to the two ends of the side wall of the fixing member, so that a length of the elastic rod can be increased, and elasticity of the elastic rod can be enhanced. When the SMA wire pulls the elastic rod, the elastic rod may easily bend and deform, and a bending deformation amplitude of the elastic rod can be increased.

In a possible implementation, a connecting portion is arranged between the two ends of the elastic rod, and the shape memory alloy wire is connected to the connecting portion.

The connecting portion is arranged between the two ends of the elastic rod, the SMA wire is connected between the two ends of the elastic rod, so that the SMA wire drives a part between the two ends of the elastic rod to move, and a bending deformation degree of the deformed end of the elastic rod is greater than that of a connection part of the SMA wire, thereby increasing a moving range of the deformed end of the elastic rod.

In a possible implementation, a middle section of the shape memory alloy wire is connected to the connecting portion, and two ends of the shape memory alloy wire are located on a same side of the connecting portion.

The middle section of the SMA wire is connected to the elastic rod, and the SMA wire is in a folded and wound form, so that when the SMA wire contracts, two folded ends generate acting forces on a same side of the elastic rod, thereby increasing displacement of the SMA wire. In addition, a double driving force may be provided for the bending deformation of the elastic rod, thereby increasing a moving range of the deformed end of the elastic rod.

In a possible implementation, the fixing member and the guide member each are provided with a first conductive portion and a second conductive portion, and the two ends of the shape memory alloy wire are fixed to the first conductive portion and the second conductive portion respectively.

The two ends of the SMA wire are fixed by the first conductive portion and the second conductive portion respectively, and a current is led into the SMA wire.

In a possible implementation, the first conductive portion and the second conductive portion are spaced apart along the side wall of the fixing member.

The first conductive portion and the second conductive portion are spaced apart along the side wall of the fixing member, so that a line that connects the first conductive portion to the second conductive portion is parallel to the side wall of the fixing member, and two sections of folded and wound SMA wires form a same included angle with the elastic rod, thereby improving balance of movement of the elastic rod driven by the two sections of SMA wires, and prolonging the service life of the SMA wires.

In a possible implementation, an included angle between the shape memory alloy wire and the deformed end of the elastic rod is greater than <NUM>°.

The included angle between the SMA wire and the deformed end of the elastic rod is greater than <NUM>°, and an included angle between the SMA wire and the other end of the elastic rod is less than <NUM>°. A direction of an acting force of the SMA wire on the elastic rod is biased toward the other end of the elastic rod, which easily pulls the elastic rod to deform and increases the bending deformation amplitude of the elastic rod.

In a possible implementation, the first direction and the second direction are perpendicular to each other.

In a possible implementation, the driving apparatus further includes a first guiding structure and a second guiding structure, where.

In a possible implementation, the first guiding structure further includes a first guide post, and part of the first guide post is located in the first guide groove and moves along the first guide groove; and
the second guiding structure further includes a second guide post, and part of the second guide post is located in the second guide groove and moves along the second guide groove.

In a possible implementation, the first guiding structure further includes a first limiting groove, the first limiting groove is formed in the surface of the guide member or the surface of the fixing member, the first limiting groove extends in the first direction and is opposite to the first guide groove, and the first guide post is slidably arranged in the first limiting groove; and
the second guiding structure further includes a second limiting groove, the second limiting groove is formed in the surface of the bearing member or the surface of the guide member, the second limiting groove extends in the second direction and is opposite to the second guide groove, and the second guide post is slidably arranged in the second limiting groove.

Surfaces of two opposite sides of the fixing member and the guide member are provided with the first guide groove and the first limiting groove respectively, the first guide groove and the first limiting groove are formed opposite to each other and extend in the first direction, the first guide post is slidably arranged in a space enclosed by the first guide groove and the first limiting groove, and the first guide post moves in the extension direction of the first guide groove (the first limiting groove), to limit movement of the guide member in the first direction. Surfaces of two opposite sides of the guide member and the bearing member are provided with the second guide groove and the second limiting groove respectively, the second guide groove and the second limiting groove are formed opposite to each other and extend in the second direction, the second guide post is slidably arranged in a space enclosed by the second guide groove and the second limiting groove, and the second guide post moves in the extension direction of the second guide groove (the second limiting groove), to limit movement of the bearing member in the second direction.

In a possible implementation, the first guide post is fixed to a part that is opposite to the first guide groove and that is on the guide member or the fixing member, and the second guide post is fixed to a part that is opposite to the second guide groove and that is on the bearing member or the guide member.

One of the surfaces of the two opposite sides of the fixing member and the guide member is provided with the first guide groove, the first guide groove extends in the first direction, the first guide post is fixedly arranged on the other, and the first guide post moves along the first guide groove to limit movement of the guide element in the first direction. One of the surfaces of the two opposite sides of the guide member and the bearing member is provided with the second guide groove, the second guide groove extends in the second direction, the second guide post is fixedly arranged on the other, and the second guide post moves along the second guide groove to limit movement of the bearing element in the second direction.

In a possible implementation, the driving apparatus further includes a first displacement detection assembly and a second displacement detection assembly, where.

The first Hall sensor detects displacement of the guide member relative to the fixing member, and the second Hall sensor detects displacement of the bearing member relative to the guide member, so that detection precision of the displacement of the guide member and the bearing member can be improved, and precision of the driving apparatus can be improved.

According to a second aspect, this application provides a camera module, including a housing, a lens, and the driving apparatus according to any one of the foregoing implementations, where a surface of a side of the housing is provided with a mounting hole, the lens is partially accommodated in the housing through the mounting hole, and the driving apparatus is located in the housing.

In the camera module according to this application, the driving apparatus is arranged in the housing, and the driving apparatus drives the lens to move to implement an anti-shake function of the lens. The driving apparatus includes a bearing member and a driving structure, where the lens is fixed to the bearing member, and the driving structure includes a guide member, a fixing member, and the at least two groups of driving assemblies. At least one group of driving assemblies is arranged between the fixing member and the guide member, and at least one group of driving assemblies is arranged between the guide member and the bearing member, so that the driving assemblies between the fixing member and the guide member drive the guide member to move in a first direction, the driving assemblies between the guide member and the bearing member drive the bearing member to move in a second direction, and an included angle is formed between the first direction and the second direction to drive the lens to move arbitrarily in a plane where the bearing member is located. An elastic rod and an SMA wire are used as one driving assembly, and the SMA wire expands or contracts to drive an end of the elastic rod to bend and deform, and the bending deformation of the end of the elastic rod generates displacement to drive the guide member or the bearing member to move. The end of the elastic rod generates larger bending deformation, which can increase a movement amount of the SMA wire, increase a stroke range of the driving apparatus, and improve anti-shake precision of the lens and optical performance of the camera module.

In a possible implementation, the camera module further includes a focusing assembly, where the focusing assembly includes a focusing coil and at least one magnetic member, the focusing coil is sleeved on an outer wall of the lens, a magnetic member is fixed in the housing, and the magnetic member is arranged opposite to the focusing coil.

According to a third aspect, this application provides an electronic device, including at least one camera module described above.

In the electronic device according to this application, a driving apparatus is arranged in the camera module to implement an anti-shake function of the camera module. The driving apparatus includes a bearing member and a driving structure, where the lens is fixed to the bearing member, and the driving structure includes a guide member, a fixing member, and the at least two groups of driving assemblies. At least one group of driving assemblies is arranged between the fixing member and the guide member, and at least one group of driving assemblies is arranged between the guide member and the bearing member, so that the driving assemblies between the fixing member and the guide member drive the guide member to move in a first direction, the driving assemblies between the guide member and the bearing member drive the bearing member to move in a second direction, and an included angle is formed between the first direction and the second direction to drive the lens to move arbitrarily in a plane where the bearing member is located. An elastic rod and an SMA wire are used as one driving assembly, and the SMA wire expands or contracts to drive an end of the elastic rod to bend and deform, and the bending deformation of the end of the elastic rod generates displacement to drive the guide member or the bearing member to move. The end of the elastic rod generates larger bending deformation, which can increase a movement amount of the SMA wire, increase a stroke range of the driving apparatus, improve anti-shake precision of the lens and optical performance of the camera module, and optimize service performance of the electronic device.

Terms used in implementations of this application are only used to explain specific embodiments of this application, and are not intended to limit this application.

With continuous progress of science and technology, a photographing function has gradually become essential to a mobile terminal such as a mobile phone, a tablet computer, a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a smart wearable device, or a point of sales (Point of Sales, POS).

<FIG> is a schematic diagram of a structure of an electronic device according to an embodiment of this application; and <FIG> is a partial exploded view of <FIG>. As shown in <FIG> and <FIG>, a mobile phone is used as an example to describe an electronic device <NUM> according to this application. It should be understood that the electronic device <NUM> of this embodiment includes, but is not limited to, a mobile phone. The electronic device <NUM> may alternatively be a mobile terminal such as the tablet computer, the notebook computer, the PDA, the smart wearable device, or the POS described above.

As shown in <FIG> and <FIG>, the electronic device <NUM> may include a housing <NUM>, a display panel <NUM>, a camera module <NUM>, and a circuit board <NUM>. The housing <NUM> is enclosed on a back surface and a side face of the electronic device <NUM>, and the display panel <NUM> is mounted on the housing <NUM>. The display panel <NUM> and the housing <NUM> enclose an accommodating space of the electronic device <NUM>, and the camera module <NUM> and the circuit board <NUM> are mounted in the accommodating space. In addition, a device such as a microphone, a speaker, or a battery may be further arranged in the accommodating space.

<FIG> shows an area that is of the camera module <NUM> and that is located at the top of the housing <NUM> close to an edge. It can be understood that a position of the camera module <NUM> is not limited to the position shown in <FIG>.

As shown in <FIG>, in some embodiments, the housing <NUM> may include a back cover <NUM> and a middle frame <NUM>. The back cover <NUM> is provided with a light-transmitting hole <NUM>, the camera module <NUM> may be arranged on the middle frame <NUM>, and the camera module <NUM> collects external ambient light through the light-transmitting hole <NUM> in the back cover <NUM>. A light sensing surface of the camera module <NUM> is opposite to the light-transmitting hole <NUM>, and external ambient light passes through the light-transmitting hole <NUM> to irradiate the light sensing surface. The light sensing surface is used to collect external ambient light. The camera module <NUM> is configured to convert an optical signal into an electrical signal to implement a photographing function thereof.

<FIG> shows that a camera module <NUM> is provided inside an electronic device <NUM>. It should be noted that in actual application, a quantity of camera modules <NUM> is not limited to one, and the quantity of camera modules <NUM> may be two or more. When a plurality of camera modules <NUM> are provided, the plurality of camera modules <NUM> may be arbitrarily arranged in an X-Y plane. For example, a plurality of camera modules <NUM> are arranged in an X-axis direction, or a plurality of camera modules <NUM> are arranged in a Y-axis direction.

In addition, the camera module <NUM> includes, but is not limited to, an auto focus (Auto Focus, AF) module, a fix focus (Fix Focus, FF) module, a wide-angle camera module <NUM>, a long-focus camera module <NUM>, a color camera module <NUM>, or a black-and-white camera module <NUM>. The camera module <NUM> in the electronic device <NUM> may include any one of the foregoing camera modules <NUM>, or include two or more of the foregoing camera modules <NUM>. When two or more camera modules <NUM> are provided, the two or more camera modules <NUM> may be integrated into one camera assembly.

As shown in <FIG>, the camera module <NUM> may be electrically connected to the circuit board <NUM>. The circuit board <NUM> is, for example, a main board in the electronic device <NUM>. In an implementation, the camera module <NUM> may be electrically connected to the main board by using an electrical connector. For example, the camera module <NUM> is provided with a female socket of the electrical connector, and the main board is provided with a male socket of the electrical connector. The female socket is inserted into the male socket, to electrically connect the camera module <NUM> to the main board. For example, the main board is provided with a processor, and the processor controls the camera module <NUM> to photograph an image. When a user inputs a photographing instruction, the processor receives the photographing instruction, and controls, based on the photographing instruction, the camera module <NUM> to photograph a photographed object.

The following describes a camera module <NUM> in an electronic device <NUM> according to an embodiment of this application.

<FIG> is a schematic diagram of a structure of a camera module according to an embodiment of this application; and <FIG> is an exploded view of <FIG>. As shown in <FIG>, the camera module <NUM> of this embodiment includes a housing <NUM>, a lens <NUM>, a driving apparatus <NUM> (not shown in the figure), a focusing assembly <NUM>, and an image sensor assembly <NUM>.

Specifically, as shown in <FIG>, the housing <NUM> may include an outer frame <NUM> and a bottom plate <NUM>, and the outer frame <NUM> and the bottom plate <NUM> jointly enclose an accommodating space of the housing <NUM>. Through the arrangement of the detachable bottom plate <NUM>, the lens <NUM>, the driving apparatus <NUM>, the focusing assembly <NUM>, the image sensor assembly <NUM>, and other devices of the camera module <NUM> can be easily mounted in the housing <NUM>.

A surface that is of a side of the outer frame <NUM> and that faces away from the bottom plate <NUM> is provided with a mounting hole <NUM>, the lens <NUM> is mounted in the housing <NUM>, and a part of the lens <NUM> passes through the mounting hole <NUM> and is exposed outside the housing <NUM>. A light inlet side of the lens <NUM> is located outside the housing <NUM>, and a light outlet side of the lens <NUM> is located inside the housing <NUM>. For example, the light inlet side of the lens <NUM> corresponds to a light-transmitting hole <NUM> in a back cover of the electronic device <NUM>. External ambient light enters the lens <NUM> from the light inlet side of the lens <NUM> through the light-transmitting hole <NUM>. The lens <NUM> includes, for example, one or more stacked lenses. An optical axis of the lens <NUM> passes through a center of the lens, and the lens converges incident light, and converged light is emitted from the light outlet side of the lens <NUM>.

The image sensor assembly <NUM> is located on a light outlet path of the lens <NUM>. For example, the image sensor assembly <NUM> is located on the light outlet side of the lens <NUM>, and the optical axis of the lens <NUM> passes through a center of the image sensor assembly <NUM>. The light emitted from the lens <NUM> enters the image sensor assembly <NUM>, and by using a photoelectric conversion function of the image sensor assembly <NUM>, a signal of the emitted light is converted into an electrical signal, so as to implement an imaging function of the camera module <NUM>.

Still referring to <FIG>, the image sensor assembly <NUM> may be located at the bottom of the housing <NUM>, that is, the image sensor assembly <NUM> is disposed close to the bottom plate <NUM>. For example, the image sensor assembly <NUM> may be fixed to the bottom plate <NUM>, and the bottom plate <NUM> supports and positions the image sensor assembly <NUM>. Specifically, the image sensor assembly <NUM> may include an image sensor <NUM> and an electrical connecting member <NUM>.

The image sensor <NUM> is located on the light outlet side of the lens <NUM>, for example, the optical axis of the lens <NUM> passes through a center of the image sensor <NUM>. The light emitted from the lens <NUM> irradiates the image sensor <NUM>, and the image sensor <NUM> converts the signal of the emitted light into an electrical signal through photoelectric conversion, thereby implementing the imaging function of the camera module <NUM>.

The electrical connecting member <NUM> is configured to electrically connect the image sensor <NUM> to an external circuit, and then control an image sensing operation by using the external circuit. Specifically, one end of the electrical connecting member <NUM> is connected to the image sensor <NUM>, and the other end of the electrical connecting member <NUM> is connected to the external circuit. For example, the other end of the electrical connecting member <NUM> is connected to the circuit board <NUM> in the electronic device. When the user performs photographing, the processor on the circuit board <NUM> controls the image sensor <NUM> to operate.

It should be noted that because the image sensor assembly <NUM> of this embodiment may be fixed in the housing <NUM>, in an example in which the image sensor assembly <NUM> is fixed to the bottom plate <NUM>, a back surface of the image sensor <NUM> is fixed to the bottom plate <NUM>. Because the image sensor <NUM> does not need to move, a flexible electrical connecting member may be used to electrically connect the image sensor <NUM> to the external circuit, or the electrical connecting member <NUM> with good strength and rigidity may be used to connect the image sensor <NUM> to the external circuit, for example, a printed circuit board (Printed Circuit Board, PCB) <NUM> is used to connect the image sensor <NUM> to the external circuit.

The image sensor <NUM> generates heat during operation, and the heat is collected on the image sensor <NUM>, which may affect performance of the image sensor <NUM>, or may make the image sensor <NUM> not operate normally in a severe case. Therefore, the image sensor <NUM> needs to undergo heat dissipation. Therefore, as shown in <FIG>, a gap is formed between a heat dissipation surface of the image sensor <NUM> (a surface that is a side of the image sensor <NUM> and that faces the bottom plate <NUM>) and the bottom plate <NUM>, the gap is filled with a heat transfer fluid <NUM>, and the heat transfer fluid <NUM> dissipates heat from the image sensor <NUM>. Through heat conduction of the heat transfer fluid <NUM>, heat dissipation efficiency of the image sensor <NUM> can be improved, and the heat dissipation effect of the image sensor <NUM> can be improved, thereby ensuring operating performance of the image sensor <NUM>.

In addition, an annular sealing plate <NUM> is attached to the bottom plate <NUM> of the housing <NUM>, and the heat transfer fluid <NUM> is located in an area enclosed by the annular sealing plate <NUM>. The heat transfer fluid <NUM> is a flowable liquid, and the annular sealing plate <NUM> is arranged on the bottom plate <NUM> of the housing <NUM>, so that the heat transfer fluid <NUM> is confined in the area enclosed by the annular sealing plate <NUM>. The area enclosed by the annular sealing plate <NUM> may correspond to the heat dissipation surface of the image sensor <NUM>.

A gap may be formed between the annular sealing plate <NUM> and the heat dissipation surface of the image sensor <NUM>, to ensure that the heat transfer fluid <NUM> is in full contact with the heat dissipation surface of the image sensor <NUM>, and reserve a certain flow space for the heat transfer fluid <NUM> to expand when heated. In addition, through surface tension of the heat transfer fluid <NUM> in the gap between a surface of the annular sealing plate <NUM> and the heat dissipation surface of the image sensor <NUM>, the heat transfer fluid <NUM> can be prevented from overflowing from the annular sealing plate <NUM>.

Still referring to <FIG>, a plurality of sealing holes <NUM> may be spaced apart in the annular sealing plate <NUM>, and the overflowing heat transfer fluid <NUM> is sealed and stored by using the sealing holes <NUM>, so that the heat transfer fluid <NUM> can be prevented from overflowing out of the annular sealing plate <NUM>. The surface of the annular sealing plate <NUM>, which may be used as an alternative to the sealing holes <NUM>, may be an uneven corrugated surface, and an extension direction of corrugations of the corrugated surface may be consistent with an extension direction of each side edge of the annular sealing plate <NUM>; or a plurality of elongated grooves may be spaced apart in the surface of the annular sealing plate <NUM>, and the elongated grooves extend in a direction of a contour line of the annular sealing plate <NUM>.

The focusing assembly <NUM> arranged in the housing <NUM> is configured to adjust a focal length of the lens <NUM>. For example, the focusing assembly <NUM> may drive the lens <NUM> to move along an optical axis of the lens <NUM> to implement a focusing function of the lens <NUM>. <FIG> is a schematic diagram of an assembled structure of a focusing assembly <NUM> and a lens <NUM> according to an embodiment of this application. As shown in <FIG>, in an implementation, the focusing assembly <NUM> may include a focusing coil <NUM> and a magnetic member <NUM>, where the focusing coil <NUM> is sleeved on an outer wall of the lens <NUM>, the magnetic member <NUM> is fixed in the housing <NUM>, and the magnetic member <NUM> is arranged opposite to the focusing coil <NUM>.

In actual application, the magnetic member <NUM> may be fixed to an inner wall of the housing <NUM>, for example, the magnetic member <NUM> is fixed to an inner side wall that is of the housing <NUM> and that is opposite to an outer side wall of the lens <NUM>; or a fixing structure is arranged in the housing <NUM>, the magnetic member <NUM> is fixed to the fixing structure, and the magnetic member <NUM> faces the focusing coil <NUM> on the outer side wall of the lens <NUM>.

When the user holds an electronic device for photographing, the circuit board <NUM> controls the focusing coil <NUM> to operate, the focusing coil <NUM> is energized to generate an electromagnetic field, and a magnetic force is generated between the focusing coil <NUM> and the magnetic member142. The magnetic force drives the focusing coil <NUM> to move, and the focusing coil <NUM> drives the lens <NUM> to move. For example, the circuit board <NUM> controls a direction and magnitude of a current in the focusing coil <NUM> based on a photographing instruction inputted by the user, adjusts a direction and magnitude of the magnetic field generated between the focusing coil <NUM> and the magnetic member <NUM>, and controls a moving direction and movement amount of the focusing coil <NUM>, so as to control a moving direction and movement amount of the lens <NUM> to focus on a photographed object.

To ensure that the focusing assembly <NUM> stably drives the lens <NUM> to move, a plurality of magnetic members <NUM> may be spaced apart on a periphery of the focusing coil <NUM> along a circumference of the focusing coil <NUM>. For example, two opposite sides of the focusing coil <NUM> each are provided with one magnetic member <NUM>; or four, six, or eight magnetic members <NUM> are evenly spaced apart along the circumference of the focusing coil <NUM>.

For example, the outer side wall of the lens <NUM> may be sleeved with a support seat <NUM>, and the focusing coil <NUM> is sleeved on an outer wall of the support seat <NUM>. The support seat <NUM> supports the lens <NUM> and fixes the focusing coil <NUM>.

When the user holds a portable electronic device (such as a mobile phone) for photographing, a photographed image is often blurred because of hand shaking. In view of this, a driving apparatus <NUM> is arranged in the housing <NUM> of the camera module <NUM>, and the driving apparatus <NUM> is configured to drive the lens <NUM> to move in a plane perpendicular to a direction of an optical axis of the lens <NUM>, for example, the driving apparatus <NUM> drives the lens <NUM> to translate or rotate in this plane. The lens <NUM> moves in the plane perpendicular to the optical axis of the lens <NUM>, to compensate for displacement caused by the shaking of the user's hand, thereby improving photographing quality.

In a related technology, there is a manner of using a conventional elastic piece type voice coil motor as a driving apparatus. However, due to an edge effect of an electromagnetic force, the motor is prone to an insufficient edge driving force when its stroke is large, and excessive displacement of an elastic piece easily leads to a risk of fatigue fracture. There is also a manner of using a shape memory alloy wire to drive the lens to move. However, due to physical properties of the shape memory alloy wire, a range of a driving stroke is usually only meet about <NUM>. Further, there is a manner of using a lifting ring wire structure as a driving apparatus. However, due to a lateral K value (heat transfer coefficient) limitation of the lifting ring wire, the current stroke range can only reach <NUM>.

In view of this, by using expansion and contraction characteristics of the shape memory alloy wire, the driving apparatus <NUM> in the camera module <NUM> of this embodiment drives an elastic rod <NUM> to deform, and displacement caused by deformation of the elastic rod <NUM> drives the lens <NUM> to move, and displacement caused by bending deformation of the elastic rod <NUM> is large, so that the stroke range of the driving apparatus <NUM> and a moving range of the lens <NUM> can be increased, and optical performance of the camera module <NUM> can be improved.

The driving apparatus <NUM> in the camera module <NUM> will be described in detail below.

<FIG> is a schematic diagram of a structure of a driving apparatus <NUM> according to an embodiment of this application; <FIG> is an exploded view of <FIG> in a front perspective; <FIG> is a schematic diagram showing that a shape memory alloy wire drives an elastic rod <NUM> to deform according to an embodiment of this application; <FIG> is a schematic diagram showing assembling of a fixing member <NUM> and a guide member <NUM> according to an embodiment of this application; <FIG> is a schematic diagram showing assembling of a guide member <NUM> and a bearing member <NUM> according to an embodiment of this application; and <FIG> is an exploded view of <FIG> in a bottom perspective.

As shown in <FIG>, the driving apparatus <NUM> includes a bearing member <NUM> and a driving structure (not shown in the figure). The bearing member <NUM> is configured to carry the lens <NUM>. As shown in <FIG>, the lens <NUM> is fixed to the bearing member <NUM>. For example, an edge part of a light outlet side of the lens <NUM> is fixed to a front surface of the bearing member <NUM>. For example, a bottom end of the focusing coil <NUM> may also be connected and fixed to the front surface of the bearing member <NUM>, to fix the focusing coil <NUM> reliably. The driving structure is movably connected to a back surface of the bearing member <NUM>, and the driving structure is configured to drive the bearing member <NUM> to move in a plane where the bearing member <NUM> is located. For example, the driving structure drives the bearing member <NUM> to translate or rotate in the plane where the bearing member <NUM> is located, and the bearing member <NUM> drives the lens <NUM> to translate or rotate in a horizontal space where the lens <NUM> is located, so as to implement an anti-shake function of the lens <NUM>.

It should be noted that, in this embodiment, a surface that is of a side of the bearing member <NUM> and that faces the lens <NUM> is defined as the front surface of the bearing member <NUM>, and a surface (surface of the other side opposite to the front surface) that is of a side of the bearing member <NUM> and that faces the driving structure is defined as the back surface of the bearing member <NUM>.

As shown in <FIG>, specifically, the driving structure includes a guide member <NUM>, a fixing member <NUM>, and a driving assembly <NUM>. The guide member <NUM> and the fixing member <NUM> are sequentially stacked on the back surface of the bearing member <NUM>, and the fixing member <NUM> is fixed in the housing <NUM>. The guide member <NUM> can move in a plane where the guide member <NUM> is located, the bearing member <NUM> can move in a plane where the bearing member <NUM> is located, and the bearing member <NUM> and the guide member <NUM> can move relative to each other. In this way, the bearing member <NUM> can drive the lens <NUM> to move arbitrarily in the plane perpendicular to the direction of the optical axis of the lens <NUM>.

A gap may be formed between the fixing member <NUM> and the guide member <NUM>, and a gap is formed between the guide member <NUM> and the bearing member <NUM>. In this way, the guide member <NUM> is less or not obstructed when moving relative to the fixing member <NUM>, and the bearing member <NUM> is less or not obstructed when moving relative to the guide member <NUM>, thereby ensuring steady and smooth movement of the guide member <NUM> and the bearing member <NUM>.

At least two groups of driving assemblies <NUM> are provided. At least one group of driving assemblies <NUM> is connected between the fixing member <NUM> and the guide member <NUM>, and the driving assemblies <NUM> between the fixing member <NUM> and the guide member <NUM> are configured to drive the guide member <NUM> to move in a plane where the guide member <NUM> is located, and the guide member <NUM> can move in a first direction. At least one group of driving assemblies <NUM> is connected between the guide member <NUM> and the bearing member <NUM>, and the driving assemblies <NUM> between the guide member <NUM> and the bearing member <NUM> are configured to drive the bearing member <NUM> to move in a plane where the bearing member <NUM> is located, and the bearing member <NUM> can move in a second direction.

For example, when the guide member <NUM> and the bearing member <NUM> are at an original position, axes of the fixing member <NUM>, the guide member <NUM>, and the bearing member <NUM> coincide, and the axes of the fixing member <NUM>, the guide member <NUM>, and the bearing member <NUM> may coincide with an axis of the lens <NUM>. With the original position of the guide member <NUM> and the bearing member <NUM> as an initial position of the lens <NUM>, a moving direction and movement amount of the guide member <NUM> and the bearing member <NUM> are controlled based on a shaking direction and shaking amount of the user's hand, so as to offset the movement amount of the hand shaking and ensure the anti-shake effect of the driving apparatus <NUM>.

Specifically, based on the shaking direction and shaking amount of the user's hand, the guide member <NUM> and the bearing member <NUM> are controlled to move in an opposite direction for a corresponding distance. For example, the bearing member <NUM> is fixed relative to the guide member <NUM>, and the guide member <NUM> drives the bearing member <NUM> to move in the first direction; or the guide member <NUM> is fixed relative to the fixing member <NUM>, and the bearing member <NUM> moves in the second direction; or the guide member <NUM> moves in the first direction relative to the fixing member <NUM>, and the bearing member <NUM> moves in the second direction relative to the guide member <NUM>.

It should be noted that an included angle is formed between the first direction and the second direction, so that by moving the guide member <NUM> in the first direction for a certain distance, the bearing member <NUM> moves in the second direction for a certain distance based on the movement of the guide member <NUM>, and the lens <NUM> can move arbitrarily in a plane perpendicular to an axial direction of the lens <NUM>.

In actual application, the shaking direction and the shaking amount of the user's hand shaking in this direction can be easily decomposed into two moving components in two directions perpendicular to each other. Therefore, in an implementation, the first direction in which the guide member <NUM> moves and the second direction in which the bearing member <NUM> moves may be perpendicular to each other. In this way, the movement of the guide member <NUM> and the bearing member <NUM> can be easily controlled, and anti-shake precision of the driving apparatus <NUM> can be improved. For example, the first direction in which the guide member <NUM> moves is an X direction shown in <FIG>, and the second direction in which the bearing member <NUM> moves is a Y direction shown in <FIG>.

In addition, the first direction includes a positive direction and a negative direction. In an example in which the first direction is the X direction shown in <FIG>, the guide member <NUM> may move in the X direction or in an -X direction. The second direction includes a positive direction and a negative direction. In an example in which the second direction is the Y direction shown in <FIG>, the bearing member <NUM> may move in the Y direction or a -Y direction.

As shown in <FIG>, each driving assembly <NUM> includes an elastic rod <NUM> and a shape memory alloy wire, that is, at least one group of elastic rods <NUM> and shape memory alloy wires are connected between the fixing member <NUM> and the guide member <NUM>, and at least one group of elastic rods <NUM> and shape memory alloy wires are connected between the guide member <NUM> and the bearing member <NUM>. When the lens <NUM> needs to compensate for the shaking of the user's hand, by changing an expansion and contraction state of each shape memory alloy wire, the elastic rod <NUM> is driven to bend and deform, and displacement caused by the bending deformation of the elastic rod <NUM> drives the guide member <NUM> or the bearing member <NUM> to move.

It should be noted that shape memory alloys (Shape Memory Alloys, SMAs) each are an alloy material that can completely eliminate its deformation at a lower temperature after heating and restore its original shape before deformation, that is, an alloy with a "memory" effect. The SMA is a thermoelastic martensitic phase change material, which can undergo a phase change when the temperature changes, so that a stress state also changes. When at a low temperature, the SMA is in a martensite phase state; and when the temperature rises, the SMA is transformed from the martensite phase to an austenite phase, and deformation contraction occurs.

Therefore, a current may be led to a shape memory alloy wire (hereinafter referred to as an SMA wire), and the SMA wire <NUM> is heated by using a heating effect of the current, to implement contraction deformation of the SMA wire <NUM>. When no current flows in the SMA wire <NUM>, the SMA wire <NUM> can be restored to its original state. In this way, the expansion-contraction deformation of the SMA wire <NUM> when a power-on state changes can drive the elastic rod <NUM> to bend and deform, and a bent and deformed end of the elastic rod <NUM> is displaced, thereby driving the guide member <NUM> or the bearing member <NUM> to move.

For the driving assemblies <NUM> connected between the fixing member <NUM> and the guide member <NUM> and the driving assemblies <NUM> connected between the guide member <NUM> and the bearing member <NUM>, in this embodiment, one end of the elastic rod <NUM> is defined as a fixed end 1341d, and the other end of the elastic rod <NUM> is defined as a moving end 1341e. The SMA wire <NUM> drives the moving end 1341e of the elastic rod <NUM> to generate large bending deformation, and the moving end 1341e of the elastic rod <NUM> drives the guide member <NUM> or the bearing member <NUM> to move.

Using the elastic rod <NUM> connected between the fixing member <NUM> and the guide member <NUM> as an example, one end that is of the elastic rod <NUM> and that is connected to the fixing member <NUM> is a fixed end 1341d of the elastic rod <NUM>, the other end that is of the elastic rod <NUM> and that is connected to the guide member <NUM> is a moving end 1341e of the elastic rod <NUM>, and the moving end 1341e of the elastic rod <NUM> drives the guide member <NUM> to move in the first direction. Using the elastic rod <NUM> connected between the guide member <NUM> and the bearing member <NUM> as an example, one end that is of the elastic rod <NUM> and that is connected to the guide member <NUM> is a fixed end 1341d of the elastic rod <NUM>, and the other end that is of the elastic rod <NUM> and that is connected to the bearing member <NUM> is a moving end 1341e of the elastic rod <NUM>, and the moving end 1341e of the elastic rod <NUM> drives the bearing member <NUM> to move in the second direction.

As shown in <FIG>, in an example in which the elastic rod <NUM> is in a natural state when no current is led into the SMA wire <NUM>, when a current is led into the SMA wire <NUM>, the SMA wire <NUM> contracts, and the SMA wire <NUM> pulls the elastic rod <NUM>, so that the moving end 1341e of the elastic rod <NUM> undergoes large bending deformation. A direction of displacement of the moving end 1341e of the elastic rod <NUM> caused by bending deformation is approximately perpendicular to an extension direction of the elastic rod <NUM> in the natural state.

In this way, the SMA wire <NUM> generates small contraction displacement in the extension direction of the SMA wire <NUM>, which can drive the moving end 1341e of the elastic rod <NUM> to generate large bending deformation. The moving end 1341e of the elastic rod <NUM> generates large displacement relative to the fixed end 1341d of the elastic rod <NUM>, and the moving end 1341e of the elastic rod <NUM> can drive the guide member <NUM> or the bearing member <NUM> to generate large displacement in a direction approximately the same the moving direction of the guide member <NUM> or the bearing member <NUM>.

The SMA wire <NUM> and the elastic rod <NUM> are arranged as one driving assembly <NUM>, the contraction of the SMA wire <NUM> drives the moving end 1341e of the elastic rod <NUM> to generate large bending deformation, and the bending deformation of the moving end 1341e of the elastic rod <NUM> may drive the guide member <NUM> or the bearing member <NUM> to generate large displacement. In this way, the contraction displacement of the SMA wire <NUM> can be increased by the bending deformation of the elastic rod <NUM>. The displacement generated when the bending deformation of the elastic rod <NUM> drives the guide member <NUM> or the bearing member <NUM> can reach several times that generated when the contraction of the SMA wire <NUM> drives the guide member <NUM> or the bearing member <NUM> to move.

Therefore, the driving apparatus <NUM> in this embodiment drives, by using the SMA wire <NUM>, the elastic rod <NUM> to bend and deform, to drive the guide member <NUM> and the bearing member <NUM> to move, which can increase the moving range of the guide member <NUM> and the bearing member <NUM>, further increase the stroke range of the driving apparatus <NUM>, meet requirements for large-stroke driving, increase the moving range of the lens <NUM> in the plane perpendicular to the direction of the optical axis of the lens <NUM>, and improve anti-shake precision of the lens <NUM> and optical performance of the camera module <NUM>.

Still referring to <FIG>, in a specific implementation, a group of driving assemblies <NUM> is connected between the fixing member <NUM> and the guide member <NUM>, and a driving assembly <NUM> connected between the fixing member <NUM> and the guide member <NUM> is defined as a first driving assembly 134a. The first driving assembly 134a includes a first elastic rod 1341a and a first SMA wire 1342a, where a fixed end 1341d of the first elastic rod 1341a is connected to the fixing member <NUM>, a moving end 1341e of the first elastic rod 1341a is connected to the guide member <NUM>, and the first SMA wire 1342a is connected between the fixing member <NUM> and the first elastic rod 1341a.

A group of driving assemblies <NUM> is connected between the guide member <NUM> and the bearing member <NUM>, and a driving assembly <NUM> connected between the guide member <NUM> and the bearing member <NUM> is defined as a second driving assembly 134b. The second driving assembly 134b includes a second elastic rod 1341b and a second SMA wire 1342b, where a fixed end 1341d of the second elastic rod 1341b is connected to the guide member <NUM>, a moving end 1341e of the second elastic rod 1341b is connected to the bearing member <NUM>, and the second SMA wire 1342b is connected between the guide member <NUM> and the second elastic rod 1341b.

In addition, using the fixing member <NUM> as reference, the first driving assembly 134a and the second driving assembly 134b may be located on different sides of the fixing member <NUM> respectively, and the first driving assembly 134a and the second driving assembly 134b are staggered. In this way, the first elastic rod 1341a and the second elastic rod 1341b are located on different sides of the fixing member <NUM> respectively, the first elastic rod 1341a and the second elastic rod 1341b are staggered, and a direction of displacement caused by bending deformation of the first elastic rod 1341a and a direction of displacement caused by bending deformation of the second elastic rod 1341b are staggered, so that the first elastic rod 1341a drives the guide member <NUM>, and the second elastic rod 1341b drives the bearing member <NUM>, to move in the first direction and the second direction that are staggered, respectively.

Using the driving assembly <NUM> shown in <FIG> as an example, the first driving assembly 134a and the second driving assembly 134b may be located on two adjacent sides of the fixing member <NUM> respectively. For example, an outer contour of the fixing member <NUM> may be rectangular, the first driving assembly 134a and the second driving assembly 134b are both arranged close to an outer edge of the fixing member <NUM>, and the first driving assembly 134a and the second driving assembly 134b are located on the two adjacent sides of the fixing member <NUM> respectively.

As shown in <FIG>, the elastic rod <NUM> may extend along a side wall of the fixing member <NUM>. Still using the rectangular outer contour of the fixing member <NUM> as an example, the elastic rod <NUM> extends along the side wall of the fixing member <NUM>, and the first elastic rod 1341a and the second elastic rod 1341b located on two adjacent sides of the fixing member <NUM> are perpendicular to each other. Because a direction of bending deformation of the first elastic rod 1341a and a direction of bending deformation of the second elastic rod 1341b are both roughly perpendicular to extension directions of the first elastic rod 1341a and the second elastic rod 1341b, the direction of bending deformation of the first elastic rod 1341a is perpendicular to that of bending deformation of the second elastic rod 1341b, and the moving direction of the guide member <NUM> is perpendicular to the moving direction of the bearing member <NUM>.

In addition, the deformed end of the elastic rod <NUM>, that is, the moving end 1341e of the elastic rod <NUM>, may be connected to a corner of the guide member <NUM> or a corner of the bearing member <NUM>. For example, the moving end 1341e of the first elastic rod 1341a is connected to the corner of the guide member <NUM>, and the moving end 1341e of the second elastic rod 1341b is connected to the corner of the bearing member <NUM>.

Using the connection between the moving end 1341e of the first elastic rod 1341a and the guide member <NUM> as an example, application of an acting force to the corner of the guide member <NUM> more easily drives the guide member <NUM> to move, and by connecting the moving end 1341e of the first elastic rod 1341a to the corner of the guide member <NUM>, the first elastic rod 1341a easily drives the guide member <NUM> to move. Similarly, by connecting the moving end 1341e of the second elastic rod 1341b to the corner of the bearing member <NUM>, the second elastic rod 1341b easily drives the bearing member <NUM> to move. In this way, flexibility of the driving apparatus <NUM> can be improved.

Specifically, as shown in <FIG>, two ends of the elastic rod <NUM> may extend to two ends of the side wall of the fixing member <NUM> respectively, so as to increase a length of the elastic rod <NUM>. In an example in which the elastic rod <NUM> is an elastic steel piece, for example, the elastic rod <NUM> is a steel piece, and a larger length of the elastic rod <NUM> indicates better elasticity of the elastic rod <NUM> and a larger elastic deformation degree of the moving end 1341e of the elastic rod <NUM>. On the contrary, if the elastic rod <NUM> has an excessively small length, the elastic rod <NUM> has higher rigidity, the elastic deformation degree of the elastic rod <NUM> is reduced, and a stroke of the driving apparatus <NUM> is not greatly increased.

As shown in <FIG>, fixing structures may be provided at corners of the fixing member <NUM>, the guide member <NUM>, and the bearing member <NUM>, and the fixed end 1341d and the moving end 1341e of the elastic rod <NUM> are fixed by the fixing structures. For example, corresponding corners that are of the fixing member <NUM>, the guide member <NUM>, and the bearing member <NUM> and that need to be connected to the end of the elastic rod <NUM> are provided with fixing posts <NUM>. The fixing posts <NUM> extend out to surfaces of the fixing member <NUM>, the guide member <NUM>, and the bearing member <NUM>, and the end of the elastic rod <NUM> is connected to side walls of the fixing posts <NUM>. The fixing posts <NUM> may be integrally formed on the fixing member <NUM>, the guide member <NUM>, and the bearing member <NUM>.

Still as shown in <FIG>, in an implementation, the SMA wire <NUM> is connected to a middle portion of the elastic rod <NUM> in a length direction. For example, a connecting portion 1341c is arranged between two ends of the elastic rod <NUM>, and the SMA wire <NUM> is connected to the connecting portion 1341c of the elastic rod <NUM>. By connecting the SMA wire <NUM> to the middle portion of the elastic rod <NUM>, the SMA wire <NUM> pulls the connecting portion 1341c of the elastic rod <NUM> to move toward a side of the elastic rod <NUM>, and drives the entire elastic rod <NUM> to bend and deform toward the side of the elastic rod <NUM>.

Because an action point of tension of the SMA wire <NUM> is located on the middle portion of elastic rod <NUM>, a part where the connecting portion 1341c of the elastic rod <NUM> is located undergoes certain displacement, and the displacement is determined by an acting force generated by the contraction of the SMA wire <NUM>. The connecting portion 1341c of the elastic rod <NUM> drives the moving end 1341e of the elastic rod <NUM> to generate larger bending deformation, and displacement caused by the bending deformation of the moving end 1341e of the elastic rod <NUM> is larger, so that the movement amount of the SMA wire <NUM> can be increased, and the driving stroke of the driving apparatus <NUM> is increased.

At the connecting portion 1341c of the elastic rod <NUM>, the SMA wire <NUM> may be close to the moving end 1341e or the fixed end 1341d of the elastic rod <NUM>; that is, the connecting portion 1341c on the elastic rod <NUM> may be close to the moving end 1341e of the elastic rod <NUM>, or the connecting portion 1341c may be close to the fixed end 1341d of the elastic rod <NUM>.

Still as shown in <FIG>, if the SMA wire <NUM> is connected to a part that is on the elastic rod <NUM> and that is close to the moving end 1341e, the SMA wire <NUM> can more easily pull the elastic rod <NUM> and more easily drive the elastic rod <NUM> to bend and deform. If the SMA wire <NUM> is connected to a part that is on the elastic rod <NUM> and that is close to the fixed end 1341d, the SMA wire <NUM> drives the moving end 1341e of the elastic rod <NUM> to generate larger bending deformation, and the elastic rod <NUM> increases the movement amount of the SMA wire <NUM> to a greater extent.

In actual application, the SMA wire <NUM> may alternatively be connected to the moving end 1341e of the elastic rod <NUM>. In this way, the movement amount generated by bending deformation of the moving end 1341e of the elastic rod <NUM> can meet a use requirement, and can effectively increase the movement amount generated by the contraction of the SMA wire <NUM>. For example, based on actual requirements, the connecting portion 1341c may be arranged at different parts between the two ends of the elastic rod <NUM>, the SMA wire <NUM> may be connected at different parts between the two ends of the elastic rod <NUM>, and the movement amount caused by the bending deformation of the moving end 1341e of the elastic rod <NUM> may reach <NUM>-<NUM> times that caused by the contraction of the SMA wire <NUM>.

As shown in <FIG>, in this embodiment, the SMA wire <NUM> may be in a folded and wound form, a middle section of the SMA wire <NUM> is connected to the connecting portion 1341c of the elastic rod <NUM>, and two ends of the SMA wire <NUM> are located on a same side of the connecting portion 1341c. When the SMA wire <NUM> is connected to the elastic rod <NUM>, the SMA wire <NUM> extends from an end of the elastic rod <NUM> to the connecting portion 1341c of the elastic rod <NUM>, and the SMA wire <NUM> bypasses the connecting portion 1341c and then extends in an opposite direction.

The SMA wire <NUM> passes across the connecting portion 1341c of the elastic rod <NUM> and then is wound and folded. When the SMA wire <NUM> is energized and contract, two sections of the wound and folded SMA wire <NUM> contract. Because the two wound sections of SMA wires <NUM> are located on the same side of the connecting portion 1341c of the elastic rod <NUM>, tension generated by the contraction of the two sections of SMA wires <NUM> on the connecting portion 1341c of the elastic rod <NUM> is toward the same side of the connecting portion 1341c, which is equivalent to simultaneous action of two SMA wires <NUM>, thereby generating a double acting force on the elastic rod <NUM>.

In this case, the two wound sections of SMA wires <NUM> simultaneously contract in the direction of the same side of the connecting portion 1341c of the elastic rod <NUM>, so that the contraction displacement of the SMA wires <NUM> is increased, and the acting force of the SMA wires <NUM> on the elastic rod <NUM> is doubled. This can provide a double driving force to the elastic rod <NUM>, increase the bending deformation degree of the moving end 1341e of the elastic rod <NUM>, and increase the displacement of the moving end 1341e of the elastic rod <NUM>, thereby increasing the stroke range of the driving apparatus <NUM> and improving anti-shake precision of the lens <NUM> and optical performance of the camera module <NUM>.

In addition, as shown in <FIG>, an included angle α between the SMA wire <NUM> and the deformed end of the elastic rod <NUM> may be greater than <NUM>°; that is, the included angle α between the SMA wire <NUM> and the moving end 1341e of the elastic rod <NUM> may be greater than <NUM>°, and an included angle β between the SMA wire <NUM> and the fixed end 1341d of the elastic rod <NUM> may be less than <NUM>°. By fixing the SMA wire <NUM> to a side of the fixed end 1341d of the elastic rod <NUM>, the SMA wire <NUM> is inclined toward the fixed end 1341d of the elastic rod <NUM>, and the tension of the SMA wire <NUM> on the connecting portion 1341c of the elastic rod <NUM> is biased toward the fixed end 1341d of the elastic rod <NUM>, so that the SMA wire <NUM> easily drives the elastic rod <NUM> to bend and deform, and the SMA wire <NUM> can drive the moving end 1341e of the elastic rod <NUM> to generate larger displacement.

In actual application, the included angle β between the SMA wire <NUM> and the fixed end 1341d of the elastic rod <NUM> may be less than <NUM>°. For example, the included angle β between the SMA wire <NUM> and the fixed end 1341d of the elastic rod <NUM> is less than <NUM>°. As described above, the elastic rod <NUM> may be arranged close to an edge of the fixing member <NUM>. Because the guide member <NUM> and the bearing member <NUM> may translate or rotate relative to the fixing member <NUM>, to prevent the SMA wire <NUM> from obstructing the movement of the guide member <NUM> and the bearing member <NUM>, the SMA wire <NUM> may be located outside edges of the guide member <NUM> and the bearing member <NUM>. In this case, a small included angle between the SMA wire <NUM> and the elastic rod <NUM> indicates a smaller space occupied by the SMA wire <NUM> and the elastic rod <NUM>, thereby saving a space in the housing <NUM> of the camera module <NUM> and reducing the volume of the camera module <NUM>.

Still as shown in <FIG>, the fixing member <NUM> and the guide member <NUM> each may be provided with a first conductive portion <NUM> and a second conductive portion <NUM>, the SMA wire <NUM> is fixed by the first conductive portion <NUM> and the second conductive portion <NUM>, and a current is led into the SMA wire <NUM>. One end of the SMA wire <NUM> is fixed to the first conductive portion <NUM>, and the other end of the SMA wire <NUM> is fixed to the second conductive portion <NUM>.

The first conductive portion <NUM> and the second conductive portion <NUM> are both connected to an external circuit. For example, the first conductive portion <NUM> and the second conductive portion <NUM> are both connected to a circuit board <NUM>. One of the first conductive portion <NUM> and the second conductive portion <NUM> is connected to a positive electrode of the external circuit, the other is connected to a negative electrode of the external circuit, and a current flows from one end to the other end of the SMA wire <NUM>.

It can be understood that the first conductive portion <NUM> and the second conductive portion <NUM> should be spaced apart to prevent short circuit of the current and damage to SMA wire <NUM>. In an implementation, the first conductive portion <NUM> and the second conductive portion <NUM> may be spaced apart along the side wall of the fixing member <NUM>, and a line that connects the first conductive portion <NUM> to the second conductive portion <NUM> is parallel to the side wall of the fixing member <NUM>. In this way, a distance between the first conductive portion <NUM> and the elastic rod <NUM> and a distance between the second conductive portion <NUM> and the elastic rod <NUM> are equal, and the two folded and wound sections of SMA wires <NUM> form the same included angle with the elastic rod <NUM>.

By making the included angles between the two sections of SMA wires <NUM> and the elastic rod <NUM> the same, when the SMA wires <NUM> are energized and contract, directions of acting forces of the two sections of SMA wires <NUM> on the elastic rod <NUM> form the same included angle with the elastic rod <NUM>, and magnitudes and directions of the acting forces generated in the two sections of SMA wires <NUM> are roughly the same, so that the SMA wires <NUM> have better balance when contracting, thereby improving control precision of the bending deformation of the elastic rod <NUM>. In addition, the service life of the SMA wires <NUM> can be prolonged.

In actual application, a shaking signal of the user's hand shaking is usually detected based on the electronic device. For example, an acceleration sensor is arranged in the electronic device, the acceleration sensor detects a shaking direction and shaking amount of the user's hand during photographing and transmits the shaking signal to a processor in the circuit board <NUM>. The processor determines, based on the shaking signal, a moving direction and movement amount which the lens <NUM> needs to compensate for, controls a direction and magnitude of a current in the first SMA wire 1342a and the second SMA wire 1342b, adjusts contraction amounts of the first SMA wire 1342a and the second SMA wire 1342b, and controls movement amounts of the first elastic rod 1341a and the second elastic rod 1341b, so as to control movement amounts of the guide member <NUM> and the bearing member <NUM>, and the bearing member <NUM> drives the lens <NUM> to move, so as to compensate for the interference of the user's hand shaking during photographing, and improve image blurring and image quality.

However, by adjusting the magnitude of the current led into the SMA wire <NUM>, the SMA wire <NUM> is controlled to contract to produce a specific movement amount, and precision in adjusting expansion and contraction of the SMA wire <NUM> is limited, so that the precision of the driving apparatus <NUM> is not ideal. Therefore, in this embodiment, the driving apparatus <NUM> further includes a first displacement detection assembly and a second displacement detection assembly, where the first displacement detection assembly detects displacement of the guide member <NUM> relative to the fixing member <NUM> in the first direction, and the second displacement detection assembly detects displacement of the bearing member <NUM> relative to the guide member <NUM> in the second direction.

Specifically, as shown in <FIG>, the first displacement detection assembly includes a first Hall sensor <NUM> and a first magnetic block <NUM>, where the first Hall sensor <NUM> is arranged on one of the fixing member <NUM> and the guide member <NUM>, the first magnetic block <NUM> is arranged on the other of the fixing member <NUM> and the guide member <NUM>, and the first Hall sensor <NUM> and the first magnetic block <NUM> are arranged opposite to each other.

In actual application, when the driving apparatus <NUM> is not in operation, that is, when the guide member <NUM> is in an initial position and does not move relative to the fixing member <NUM>, the first magnetic block <NUM> and the first Hall sensor <NUM> may face each other. In an example in which the first Hall sensor <NUM> is arranged on the fixing member <NUM> and the first magnetic block <NUM> is arranged on the guide member <NUM>, the first magnetic block <NUM> generates a magnetic field around the first Hall sensor <NUM>. When the guide member <NUM> moves in the first direction, the first magnetic block <NUM> moves in the first direction relative to the first Hall sensor <NUM>, a magnetic field intensity on a surface of the first Hall sensor <NUM> changes, and the first Hall sensor <NUM> senses displacement of the first magnetic block <NUM> based on the change of the magnetic field intensity, so as to detect the displacement of the guide member <NUM> relative to the fixing member <NUM>.

The second displacement detection assembly includes a second Hall sensor <NUM> and a second magnetic block <NUM>, where the second Hall sensor <NUM> is arranged on one of the guide member <NUM> and the bearing member <NUM>, the second magnetic block <NUM> is arranged on the other of the guide member <NUM> and the bearing member <NUM>, and the second Hall sensor <NUM> and the second magnetic block <NUM> are arranged opposite to each other.

Similar to the first Hall sensor <NUM> and the first magnetic block <NUM>, the second magnetic block <NUM> and the second Hall sensor <NUM> may face each other when the guide member <NUM> and the bearing member <NUM> each are at an initial position. In an example in which the second Hall sensor <NUM> is arranged on the guide member <NUM> and the second magnetic block <NUM> is arranged on the bearing member <NUM>, when the bearing member <NUM> moves in the second direction relative to the guide member <NUM>, the second magnetic block <NUM> moves in the second direction relative to the second Hall sensor <NUM>, a magnetic field intensity on a surface of the second Hall sensor <NUM> changes, and the second Hall sensor <NUM> senses displacement of the second magnetic block <NUM> based on the change of the magnetic field intensity, so as to detect the displacement of the bearing member <NUM> relative to the guide member <NUM>.

For example, the first Hall sensor <NUM> and the first magnetic block <NUM> may be arranged on a same side as the first driving assembly 134a, and the second Hall sensor <NUM> and the second magnetic block <NUM> may be arranged on a same side as the second driving assembly 134b.

A Hall sensor <NUM> between the fixing member <NUM> and the guide member <NUM> detects the displacement of the guide member <NUM> relative to the fixing member <NUM>, and a Hall sensor <NUM> between the guide member <NUM> and the bearing member <NUM> detects the displacement of the bearing member <NUM> relative to the guide member <NUM>, to improve detection precision of the displacement of the guide member <NUM> and the bearing member <NUM>, so as to precisely control the magnitude of the current in the first SMA wire 1342a and the second SMA wire 1342b based on the displacement which the lens <NUM> needs to compensate for.

For example, during movement of the guide member <NUM> and the bearing member <NUM>, the displacement of the guide member <NUM> and the bearing member <NUM> is continuously detected by the Hall sensor <NUM>, and a current is continuously supplied to the first SMA wire 1342a and the second SMA wire 1342b until the Hall sensor <NUM> detects that the guide member <NUM> and the bearing member <NUM> move to a compensation position, and the current supply to the first SMA wire 1342a and the second SMA wire 1342b is stopped.

As described above, the guide member <NUM> moves in the first direction, the bearing member <NUM> moves in the second direction, the SMA wire <NUM> drives the elastic rod <NUM> to bend and deform toward the side of the fixing member <NUM>, and the displacement caused by the bending deformation of the moving end 1341e of the elastic rod <NUM> is roughly in a linear direction, which may make the guide member <NUM> move roughly in the first direction and make the bearing member <NUM> move roughly in the second direction. To improve accuracy of moving directions of the guide member <NUM> and the bearing member <NUM>, a first guiding structure may be further provided between the fixing member <NUM> and the guide member <NUM>, and the first guiding structure is configured to move the guide member <NUM> in the first direction. A second guiding structure may be provided between the guide member <NUM> and the bearing member <NUM>, and the second guiding structure is configured to move the bearing member <NUM> in the second direction. By using guiding effects of the first guiding structure and the second guiding structure, it is ensured that the guide member <NUM> moves precisely in the first direction, and the bearing member <NUM> moves precisely in the second direction.

Specifically, as shown in <FIG> and <FIG>, the first guiding structure includes a first guide groove <NUM>, a first limiting groove <NUM>, and a first guide post <NUM>. The first guide groove <NUM> is provided in a surface that is of the fixing member <NUM> and that faces the guide member <NUM>, or the first guide groove <NUM> is provided in a surface that is of the guide member <NUM> and that faces the fixing member <NUM>. In an example in which the first guide groove <NUM> is provided in the fixing member <NUM>, the first limiting groove <NUM> is provided in the guide member <NUM>, the first guide groove <NUM> and the first limiting groove <NUM> are provided opposite to each other, both the first guide groove <NUM> and the first limiting groove <NUM> extend in the first direction, the first guide post <NUM> is located in an accommodating space formed between the first guide groove <NUM> and the first limiting groove <NUM>, and the first guide post <NUM> can move in an extension direction of the first guide groove <NUM> (the first limiting groove <NUM>). In this way, the guide member <NUM> can be limited to move in the first direction relative to the fixing member <NUM>. In addition, the fixing member <NUM> and the guide member <NUM> are in sliding contact with each other by using the first guide post <NUM>, which can reduce friction between the fixing member <NUM> and the guide member <NUM> and ensure smooth movement of the guide member <NUM>.

Still referring to <FIG> and <FIG>, the second guiding structure includes a second guide groove <NUM>, a second limiting groove <NUM>, and a second guide post <NUM>. The second guide groove <NUM> is provided in a surface that is of the guide member <NUM> and that faces the bearing member <NUM>, or the second guide groove <NUM> is provided in a surface that is of the bearing member <NUM> and that faces the guide member <NUM>. In an example in which the second guide groove <NUM> is provided in the guide member <NUM>, the second limiting groove <NUM> is provided in the bearing member <NUM>, the second guide groove <NUM> and the second limiting groove <NUM> are provided opposite to each other, both the second guide groove <NUM> and the second limiting groove <NUM> extend in the second direction, the second guide post <NUM> is located in an accommodating space formed between the second guide groove <NUM> and the second limiting groove <NUM>, and the second guide post <NUM> can move in an extension direction of the second guide groove <NUM> (the second limiting groove <NUM>).

Because the guide member <NUM> is limited to move in the first direction, the second guide groove <NUM> (the second limiting groove <NUM>) and the second guide post <NUM> cooperate with each other to limit the movement of the bearing member <NUM> in the second direction relative to the guide member <NUM>. In addition, similar to the effect of the first guide post <NUM> between the fixing member <NUM> and the guide member <NUM>, the second guide post <NUM> can reduce friction between the guide member <NUM> and the bearing member <NUM>, and ensure smooth movement of the bearing member <NUM>.

In other implementations, the first guiding structure may include a first guide groove <NUM> and a first guide post <NUM>, where the first guide groove <NUM> is provided in a surface that is of the fixing member <NUM> and that faces the guide member <NUM> or in a surface that is of the guide member <NUM> and that faces the fixing member <NUM>, the first guide groove <NUM> extends in the first direction, and the first guide post <NUM> is arranged opposite to the first guide groove <NUM>. In an example in which the first guide groove <NUM> is provided in the surface of the fixing member <NUM>, the first guide post <NUM> may be fixed to the surface of the guide member <NUM>. For example, the first guide post <NUM> is bonded, welded or integrally formed on the surface of the guide member <NUM>, and the first guide post <NUM> extends into the first guide groove <NUM> and moves along the first guide groove <NUM> to limit the movement of the guide member <NUM> in the first direction.

The second guiding structure may include a second guide groove <NUM> and a second guide post <NUM>, where the second guide groove <NUM> is provided in a surface that is of the guide member <NUM> and that faces the bearing member <NUM> or in a surface that is of the bearing member <NUM> and that faces the guide member <NUM>, the second guide groove <NUM> extends in the second direction, and the second guide post <NUM> is arranged opposite to the second guide groove <NUM>. In an example in which the second guide groove <NUM> is provided in the surface of the guide member <NUM>, the second guide post <NUM> may be fixed to the surface of the bearing member <NUM>. For example, the second guide post <NUM> is bonded, welded or integrally formed on the surface of the bearing member <NUM>, and the second guide post <NUM> extends into the second guide groove <NUM> and moves along the second guide groove <NUM> to limit the movement of the bearing member in the second direction.

Because light emitted from a light outlet side of the lens <NUM> needs to sequentially pass through the bearing member <NUM>, the guide member <NUM>, and the fixing member <NUM> to reach a light sensing surface of the image sensor <NUM>, as shown in <FIG>, the bearing member <NUM>, the guide member <NUM>, and the fixing member <NUM> are usually provided with through holes <NUM>. In view of this, the first guide groove <NUM> (the first limiting groove <NUM>) and the second guide groove <NUM> (the second limiting groove <NUM>) are usually provided in parts of the fixing member <NUM>, the guide member <NUM>, and the bearing member <NUM> close to edges. In addition, in an example in which the first direction and the second direction are perpendicular to each other, the second guide groove <NUM> (second limiting groove <NUM>) and the second guide groove <NUM> (second limiting groove <NUM>) may be perpendicular to each other.

In addition, when the guide member <NUM> or the bearing member <NUM> moves, to reduce an acting force between the first guide post <NUM> and a first guide rail and an acting force between the second guide post <NUM> and a second guide rail, the first guide post <NUM> and the second guide post <NUM> may be cylindrical guide posts. In this way, when the guide member <NUM> has a tendency to move in a direction other than the first direction relative to the fixing member <NUM>, or when the bearing member <NUM> has a tendency to move in a direction other than the second direction relative to the guide member <NUM>, rolling of the first guide post <NUM> in the first guide groove <NUM> (the first limiting groove <NUM>) and rolling of the second guide post <NUM> in the second guide groove <NUM> (the second limiting groove <NUM>) prevent the first guide post <NUM> from generating excessive pressure on the first guide groove <NUM> (the first limiting groove <NUM>) and prevent the second guide post <NUM> from generating excessive pressure on the second guide groove <NUM> (the second limiting groove <NUM>), thereby prolonging the service life of the fixing member <NUM>, the guide member <NUM>, and the bearing member <NUM>.

The driving apparatus <NUM> according to this embodiment is configured to drive the lens to move in a plane perpendicular to the direction of the optical axis of the lens <NUM>, so as to implement an anti-shake function of the lens <NUM>. The driving apparatus <NUM> includes a bearing member <NUM> and a driving structure, where the lens <NUM> is fixed to the bearing member <NUM>, and the driving structure includes a guide member <NUM>, a fixing member <NUM>, and the at least two groups of driving assemblies <NUM>. At least one group of driving assemblies <NUM> is arranged between the fixing member <NUM> and the guide member <NUM>, at least one group of driving assemblies <NUM> is arranged between the guide member <NUM> and the bearing member <NUM>, so that the driving assemblies <NUM> between the fixing member <NUM> and the guide member <NUM> drive the guide member <NUM> to move in the first direction, the driving assemblies <NUM> between the guide member <NUM> and the bearing member <NUM> drive the bearing member <NUM> to move in the second direction, and an included angle is formed between the first direction and the second direction to drive the lens <NUM> to move arbitrarily in a plane where the bearing member <NUM> is located. An elastic rod <NUM> and an SMA wire <NUM> are used as one driving assembly <NUM>, and the SMA wire <NUM> expands or contracts to drive an end of the elastic rod <NUM> to bend and deform, and the bending deformation of the end of the elastic rod <NUM> generates displacement to drive the guide member <NUM> or the bearing member <NUM> to move. The end of the elastic rod <NUM> generates larger bending deformation, which can increase a movement amount of the SMA wire <NUM>, increase a stroke range of the driving apparatus <NUM>, and improve precision of lens <NUM> anti-shake and optical performance of the camera module <NUM>.

In the descriptions of embodiments of this application, it should be noted that unless otherwise specified and defined explicitly, the terms "mount", "connected to", and "connect" should be understood in a broad sense, and for example, may be a fixed connection or an indirect connection by using an intermediate medium, or may be internal communication between two elements or an interaction relationship between two elements. A person of ordinary skill in the art can understand specific meanings of the foregoing terms in embodiments of this application based on a specific situation.

Claim 1:
A driving apparatus (<NUM>) for driving a lens (<NUM>) of a camera module to move, comprising a bearing member (<NUM>) and a driving structure, wherein the lens is fixed to the bearing member, and the driving structure comprises a guide member (<NUM>), a fixing member (<NUM>), and at least two groups of driving assemblies (<NUM>); and the guide member and the fixing member are sequentially arranged on a light outlet side of the lens in a direction of an optical axis of the lens;
at least one group of driving assemblies is connected between the fixing member and the guide member, at least one group of driving assemblies is connected between the guide member and the bearing member, the driving assemblies connected between the fixing member and the guide member are configured to drive the guide member to move in a first direction, and the driving assemblies connected between the guide member and the bearing member are configured to drive the bearing member to move in a second direction, wherein an included angle is formed between the first direction and the second direction, wherein the first direction and the second direction are perpendicular to each other; and
the driving assemblies each comprise an elastic rod (<NUM>) and a shape memory alloy wire (<NUM>), wherein the shape memory alloy wire drives an end of the elastic rod (1341e) to bend and deform through expansion and contraction of the shape memory alloy wire, and the elastic rod deforms and drives the guide member or the bearing member to move;
wherein the first elastic rod extends along a side wall of the fixing member, and the deformed end of the first elastic rod is connected to a corner of the guide member or a corner of the bearing member;
wherein a connecting portion (1341c) is arranged between the two ends of the first elastic rod, and the shape memory alloy wire is connected to the connecting portion; and
wherein a middle section of the shape memory alloy wire is connected to the connecting portion, and two ends of the shape memory alloy wire are connected on a same side of the connecting portion.