CN114125210A

CN114125210A - Driving device, camera module and electronic equipment

Info

Publication number: CN114125210A
Application number: CN202110883206.3A
Authority: CN
Inventors: 夏太红; 原帅; 陈超; 余洋华
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2021-05-18
Filing date: 2021-08-02
Publication date: 2022-03-01
Anticipated expiration: 2041-08-02
Also published as: CN114125210B

Abstract

The application provides a driving device, a camera module and electronic equipment, wherein the driving device is characterized in that an elastic guide piece is arranged between a bearing piece and a fixing piece, an SMA wire is arranged on one side of the bearing piece, two ends of the SMA wire are respectively fixed on two sides of the fixing piece, the middle section of the SMA wire is connected to the elastic guide piece, and an included angle is formed between a wire section between the end part and the middle section of the SMA wire and the surface of the fixing piece when the SMA wire is not contracted; when the SMA wire is not contracted, the bearing piece is positioned at the first position; after the SMA wire contracts and deforms, the SMA wire drives the elastic guide piece to move, and drives the bearing piece to move to a second position along the optical axis direction of the lens; when the bearing piece moves between the first position and the second position, the lens is driven to switch between a far focus position and a near focus position, and the two-gear focusing function of the lens is realized; because the SMA line is located on one side of the bearing piece, the size of the driving device can be reduced, and the lightening and thinning of the camera module are facilitated.

Description

Driving device, camera module and electronic equipment

The present application claims priority of chinese patent application with application number 202110542664.0, entitled "driving device, camera module and electronic device", filed by the chinese intellectual property office at 18/05/2021, which is incorporated herein by reference in its entirety or in part.

Technical Field

The application relates to the technical field of mobile terminals, in particular to a driving device, a camera module and electronic equipment.

Background

In life, people often use electronic devices such as mobile phones and tablet computers to take pictures, and taking a mobile phone as an example, a camera of the mobile phone generally needs to take pictures of scenes with different far focuses and near focuses.

At present, an Auto Focus (AF) camera is arranged in a mobile phone, a lens of the AF camera is driven by a driving motor to move along an optical axis direction of the AF camera, and a distance between the lens and an image sensor is adjusted to realize a focusing function of the AF camera. Specifically, a driving chip is arranged in the mobile phone, and the driving chip controls the driving motor to drive the lens to move so as to continuously and accurately adjust the distance between the lens and the image sensor.

However, the structure of the camera module is complicated due to the high precision requirement for controlling the driving motor by the driving chip.

Disclosure of Invention

The application provides a drive arrangement, module and electronic equipment make a video recording, drive arrangement can realize far-focus and two shelves of near-focus and focus fast, and simple structure is with low costs, and occupation space is little, is favorable to making a video recording module and electronic equipment's frivolousization.

In a first aspect, the present application provides a driving apparatus for driving a lens of a camera module to move, including a bearing member, a fixing member, and a driving assembly, where the bearing member and the fixing member are stacked in an optical axis direction of the lens, the bearing member is used for supporting the lens, and the driving assembly is used for driving the bearing member to move in the optical axis direction of the lens;

the driving assembly comprises an elastic guide piece and a shape memory alloy wire, the elastic guide piece is positioned between the bearing piece and the fixing piece, the shape memory alloy wire is positioned on one side of the bearing piece, two ends of the shape memory alloy wire are respectively fixed on the fixing piece at positions close to the two ends, and the middle section of the shape memory alloy wire is connected to the elastic guide piece;

when the shape memory alloy wire is not contracted, a line segment between the end part and the middle section of the shape memory alloy wire is inclined relative to the surface of the fixing piece, and the bearing piece is positioned at a first position; after the shape memory alloy wire contracts, the elastic guide piece drives the bearing piece to move to the second position.

According to the driving device provided by the application, the elastic guide piece is arranged between the bearing piece and the fixing piece, the SMA wire is arranged on one side of the bearing piece, the two ends of the SMA wire are respectively fixed on the parts, close to the two ends, of the fixing piece, the middle section of the SMA wire is connected to the elastic guide piece, and when the SMA wire is not contracted, an included angle is formed between the wire section between the end part and the middle section of the SMA wire and the surface of the fixing piece; when the SMA wire is not contracted, the bearing piece is positioned at the first position; after the SMA wire contracts and deforms, the SMA wire drives the elastic guide piece to move, and the elastic guide piece drives the bearing piece to move to a second position along the optical axis direction of the lens; when the bearing piece moves between the first position and the second position, the lens is driven to be rapidly switched between a far focus position and a near focus position, and the two-gear focusing function of the lens is realized; because the SMA line is arranged on one side of the bearing piece, the occupied space is small, the size of the driving device can be reduced, and the driving device is light and thin.

In one possible embodiment, when the shape memory alloy wire is not contracted, the two ends of the shape memory alloy wire are equal to the distance between the surface of the fixing piece facing the bearing piece, and the line segments on the two sides of the middle section of the shape memory alloy wire are the same in length.

The distances between the two ends of the SMA wire and the surface of the fixed piece are equal, and the lengths of the wire sections on the two sides of the middle section of the SMA wire are the same, so that the wire sections on the two sides of the middle section of the SMA wire are symmetrical, the stress of the SMA wire is balanced, and the balance of the movement of the bearing piece driven by the SMA wire is ensured.

In one possible embodiment, when the shape memory alloy wire is not contracted, the two ends of the shape memory alloy wire are opposite to the surface of the middle section of the shape memory alloy wire, which is far away from the fixing piece;

or when the shape memory alloy wire is not contracted, the two ends of the shape memory alloy wire are close to the surface of the fixing piece relative to the middle section of the shape memory alloy wire.

In a possible embodiment, the elastic guide comprises a movable part, a deformation part and a fixed part, the movable part is located on one side of the bearing part, the deformation part and the fixed part are connected to at least one end of the movable part, the deformation part is located between the movable part and the fixed part, and the deformation part extends from one side of the bearing part to the opposite side of the bearing part;

wherein, the movable part is fixed on the bearing piece, the fixed part is fixed on the fixing piece, and the middle section of the shape memory alloy wire is connected on the movable part.

The movable part of the elastic guide piece is fixedly connected with the bearing piece, the fixed part is fixedly connected with the fixed part, the SMA wire is connected to the movable part, the movable part is driven to move by the contraction deformation of the SMA wire, the bearing piece is driven to move by the movable part, the deformation part between the movable part and the fixed part of the elastic guide piece is deformed, the elastic force of the elastic guide piece and the tensile force of the SMA wire are balanced with each other, and the inclination or the overturn of the bearing piece is avoided.

In a possible embodiment, the deformation portion and the fixing portion are connected to both ends of the movable portion.

Deformation portion and fixed part are all connected through the both ends at movable part, and the symmetry of elastic guide is good, and elastic guide atress is even, and the effort that the deformation portion of both sides produced to the both sides that hold the thing is balanced, can guarantee to hold the equilibrium that holds the thing.

In a possible embodiment, the end of the deformation part connected with the fixing part extends to the edge close to the fixing part.

Through making the deformation portion extend to the edge that is close to the mounting, increase the length of deformation portion, reduce the rigidity of elastic guide, promote elastic guide's reliability, and elastic guide is changeed and is out of shape, is favorable to SMA wire pulling elastic guide's movable part.

In one possible embodiment, a bending section is arranged between the deformation part and the fixing part.

The bending section is arranged between the deformation part and the fixing part, so that the length of the deformation part and the length of the fixing part are increased, the rigidity of the elastic guide part is reduced, the reliability of the elastic guide part is improved, the pulling force required by the SMA wire to pull up the movable part of the elastic guide part is reduced, and the connection strength of the fixing part and the fixing part is enhanced.

In one possible embodiment, the movable part is provided with a connecting plate at a position corresponding to the middle of the outer side wall of the bearing part, the connecting plate extends from the outer edge of the movable part to the edge of the fixing part, and the middle section of the shape memory alloy wire bypasses two sides of the connecting plate.

The middle part of the movable part is provided with the connecting plate, the middle section of the SMA wire is hung on the connecting plate, and the distances between the connecting plate and the two ends of the SMA wire are equal, so that the stress balance of the wire sections on the two sides of the middle section of the SMA wire is ensured.

In a possible implementation manner, two sides of the connecting plate are respectively provided with a first clamping groove and a second clamping groove, the first clamping groove and the second clamping groove respectively extend from two sides of the connecting plate to the middle of the connecting plate, and two sides of the middle section of the shape memory alloy wire are respectively clamped into the first clamping groove and the second clamping groove.

Through set up first draw-in groove and second draw-in groove in the both sides of connecting plate, make the both sides in SMA line middle section block respectively in first draw-in groove and the second draw-in groove to the middle section of SMA line breaks away from the connecting plate, guarantees the stability that SMA line and connecting plate are connected.

In one possible embodiment, the groove bottom of the first clamping groove forms a first buffer wall, the groove bottom of the second clamping groove forms a second buffer wall, and the distance between the first buffer wall and the second buffer wall gradually decreases from the inner edge of the movable portion to the outer edge of the movable portion.

The distance between the first buffer wall and the second buffer wall is gradually reduced from the inner edge to the outer edge of the movable part, and the connecting part between the connecting plate and the movable part forms a buffer structure.

In a possible embodiment, a stop extends from an outer side wall of the carrier, the stop corresponds to the connecting plate, and a gap is formed between the stop and the connecting plate.

Through set up the fender platform that corresponds with the connecting plate on bearing the piece, keep off the deflection degree that the platform can restrict the connecting plate, avoid the connecting plate transition to deflect, prolong the life of elastic guide.

In a possible embodiment, the outer edge of the movable portion extends with at least one bending portion, and the bending portion extends along the outer side wall of the bearing member and is fixedly connected with the outer side wall of the bearing member.

The outer edge of the movable part is provided with a bending part, the bending part extends along the outer side wall of the bearing part and is attached to the outer side wall of the bearing part, and the movable part of the elastic guide part is fixedly connected with the outer side wall of the bearing part through fixedly connecting the bending part to the outer side wall of the bearing part.

In a possible embodiment, the driving device further includes a housing, and the housing is disposed outside the supporting member, the fixing member, and the driving assembly.

In a possible embodiment, when the supporting element is located at the first position, a surface of the supporting element facing the fixing element abuts against the fixing element, and when the supporting element is located at the second position, a surface of the supporting element facing away from the fixing element abuts against an inner wall of the housing;

or when the bearing piece is located at the first position, the surface of the bearing piece, which is far away from the fixing piece, abuts against the inner wall of the shell, and when the bearing piece is located at the second position, the surface of the bearing piece, which faces the fixing piece, abuts against the fixing piece.

When the bearing piece is located the first position or the second position, the surface facing the fixing piece of the bearing piece is abutted to the fixing piece, or the surface facing away from the fixing piece of the bearing piece is abutted to the inner wall of the shell, so that the stability of the bearing piece is ensured, the position accuracy of the bearing piece is ensured, and the focusing accuracy of the lens is improved.

In a possible embodiment, the surface of the carrier facing away from the fixing element is provided with at least one stop lug for abutment with an inner wall of the housing.

Set up spacing boss through the surface that holds the carrier and deviate from the mounting, through spacing boss and drive arrangement's shells inner wall butt, reduce the friction that holds carrier and shells inner wall, make and hold carrier and drive arrangement's shells inner wall contact stability.

In a possible embodiment, the surface of the bearing element, which faces away from the fixing element, is provided with at least two limiting bosses, and the at least two limiting bosses are respectively correspondingly positioned on two sides of the middle section of the shape memory alloy wire.

Both sides through the middle section that holds the carrier surface and correspond to the SMA wire all set up spacing boss to the both sides atress that makes hold the carrier is balanced, avoids holding carrier slope or upset.

In a possible implementation manner, two ends of one side of the fixing element corresponding to the shape memory alloy wire are respectively provided with a first conductive pillar and a second conductive pillar, and two ends of the shape memory alloy wire are respectively connected to the first conductive pillar and the second conductive pillar.

In a possible embodiment, the bearing member is sleeved on an outer sidewall of the lens, and the fixing member is located on a light emitting side of the lens.

In a second aspect, the present application provides a camera module, comprising a lens and the driving device as described in any one of the above, wherein a mounting hole is provided on a side surface of a housing of the driving device, and the lens is accommodated in the housing through the mounting hole.

The camera module comprises a driving device and a lens arranged in the driving device, wherein the driving device can drive the lens to move, an elastic guide piece is arranged between a bearing piece and a fixing piece of the driving device, an SMA wire is arranged on one side of the bearing piece, the middle section of the SMA wire is connected to the elastic guide piece by respectively fixing the two ends of the SMA wire to the fixing piece at parts close to the two ends, and an included angle is formed between the wire section between the end part and the middle section of the SMA wire and the surface of the fixing piece when the SMA wire is not contracted; when the SMA wire is not contracted, the bearing piece is positioned at the first position; after the SMA wire contracts and deforms, the SMA wire drives the elastic guide piece to move, and the elastic guide piece drives the bearing piece to move to a second position along the optical axis direction of the lens; when the bearing piece moves between the first position and the second position, the lens is driven to be rapidly switched between a far focus position and a near focus position, and the two-gear focusing function of the lens is realized; because the SMA line is located on one side of the bearing piece, the occupied space is small, the size of the driving device can be reduced, and the lightening and thinning of the camera module are facilitated.

In a third aspect, the present application provides an electronic device, which includes at least one camera module as described above.

The electronic equipment comprises a camera module, wherein the camera module comprises a driving device and a lens arranged in the driving device, the driving device can drive the lens to move, an elastic guide piece is arranged between a bearing piece and a fixing piece by the driving device, an SMA wire is arranged on one side of the bearing piece, the two ends of the SMA wire are respectively fixed on the fixing piece at the parts close to the two ends, the middle section of the SMA wire is connected to the elastic guide piece, and an included angle is formed between the wire section between the end part and the middle section of the SMA wire and the surface of the fixing piece when the SMA wire is not contracted; when the SMA wire is not contracted, the bearing piece is positioned at the first position; after the SMA wire contracts and deforms, the SMA wire drives the elastic guide piece to move, and the elastic guide piece drives the bearing piece to move to a second position along the optical axis direction of the lens; when the bearing piece moves between the first position and the second position, the lens is driven to be rapidly switched between a far focus position and a near focus position, and the two-gear focusing function of the lens is realized; because the SMA line is located on one side of the bearing piece, the occupied space is small, the size of the driving device can be reduced, and the lightening and thinning of the camera module are facilitated.

Drawings

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure;

FIG. 2 is a partial exploded view of FIG. 1;

fig. 3 is a schematic structural diagram of a camera module according to an embodiment of the present disclosure;

FIG. 4 is an exploded view of FIG. 3;

fig. 5 is a schematic structural diagram of a driving device according to an embodiment of the present application;

fig. 6 is an exploded view of a driving device provided in an embodiment of the present application;

fig. 7a is a structural diagram of the driving device provided in the embodiment of the present application after a housing is removed;

FIG. 7b is a side view of FIG. 7 a;

FIG. 8 is a view of the carrier of FIG. 7a with the carrier removed;

FIG. 9 is a schematic structural diagram of a resilient guide provided in an embodiment of the present application;

fig. 10a is a front view of a carrier provided by an embodiment of the present application;

fig. 10b is a bottom view of a carrier provided by an embodiment of the present application;

fig. 11 is a schematic structural diagram of a fixing element provided in an embodiment of the present application.

Description of reference numerals:

100-an electronic device;

1-a camera module; 2-a housing; 21-rear cover; 211-light transmission holes; 22-middle frame; 3-a display panel; 4-a circuit board;

11-a drive device; 12-a lens; 13-an image sensor assembly; 14-heat conducting liquid; 15-annular sealing plate;

111-a housing; 112-a carrier; 113-a fixing member; 114-a resilient guide; 115-SMA wire; 116-a first conductive post; 117-second conductive pillars; 131-an image sensor; 132-an electrical connection; 151-sealing the hole;

1111-outer frame; 1112-a base plate; 1121-blocking table; 1122-limit boss; 1123-fixed groove; 1124-positioning the boss; 1131-support column; 1132 — an avoidance recess; 1141-a movable part; 1142-a deformation part; 1143-a fixed part; 1144-a bending back section; 1145-connecting plate; 1146-a first card slot; 1147-a second card slot; 1148-bending part;

111 a-mounting holes; 1146a — a first buffer wall; 1147 a-a second buffer wall.

Detailed Description

The terminology used in the description of the embodiments section of the present application is for the purpose of describing particular embodiments of the present application only and is not intended to be limiting of the present application.

With the continuous progress of science and technology, the shooting function has become the basic equipment of mobile terminals such as mobile phones, tablet computers, notebook computers, Personal Digital Assistants (PDAs), smart wearable devices, and Point of Sales (POS).

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure; fig. 2 is a partial exploded view of fig. 1. Referring to fig. 1 and 2, an electronic device 100 according to the present application will be described with reference to a mobile phone as an example. It should be understood that the electronic device 100 of the present embodiment includes, but is not limited to, a mobile phone, and the electronic device 100 may also be a mobile terminal such as the tablet computer, the notebook computer, the PDA, the smart wearable device, or the POS.

Referring to fig. 1 and 2, the electronic apparatus 100 may include a housing 2, a display panel 3, a camera module 1, and a circuit board 4. The back and the side of electronic equipment 100 are enclosed to shell 2, and display panel 3 installs on shell 2, and display panel 3 and shell 2 enclose into electronic equipment 100's accommodation space jointly, and module 1 and circuit board 4 of making a video recording all install in this accommodation space. In addition, a microphone, a loudspeaker, a battery or other devices can be arranged in the accommodating space.

Referring to fig. 1, the camera module 1 is shown in the area near the top edge of the housing 2. It is to be understood that the position of the camera module 1 is not limited to the position shown in fig. 1.

Referring to fig. 2, in some embodiments, the housing 2 may include a rear cover 21 and a middle frame 22, a light hole 211 is formed in the rear cover 21, the camera module 1 may be disposed on the middle frame 22, and the camera module 1 collects external ambient light through the light hole 211 in the rear cover 21. Wherein, the sensitization face and the light trap 211 of module 1 of making a video recording set up relatively, and external environment light passes the light trap 211 and shines to the sensitization face, and the sensitization face is used for gathering external environment light, and module 1 of making a video recording is used for converting light signal into the signal of telecommunication to realize its shooting function.

Fig. 2 shows that one camera module 1 is provided in the electronic device 100, and it should be noted that, in practical applications, the number of camera modules 1 is not limited to one, and the number of camera modules 1 may also be two or more than two. When the number of the camera modules 1 is plural, the plurality of camera modules 1 can be arranged arbitrarily in the X-Y plane. For example, the plurality of camera modules 1 are arranged in the X-axis direction, or the plurality of camera modules 1 are arranged in the Y-axis direction.

In addition, the camera module 1 includes, but is not limited to, an Auto Focus (AF) module, a Fixed Focus (FF) module, a wide camera module, a telephoto camera module, a color camera module, or a monochrome camera module. The camera module 1 in the electronic device 100 may include any one of the camera modules 1, or two or more of the camera modules 1. When the number of the camera modules 1 is two or more, the two or more camera modules 1 may be integrated into one camera module.

Referring to fig. 2, the camera module 1 may be electrically connected to the circuit board 4. The circuit board 4 is, for example, a main board in the electronic device 100, and as an embodiment, the camera module 1 may be electrically connected to the main board through an electrical connector. For example, the camera module 1 is provided with a female seat of an electrical connector, and the motherboard is provided with a male seat of the electrical connector, and the female seat is inserted into the male seat to realize the electrical connection between the camera module 1 and the motherboard. Wherein, be equipped with the treater on the mainboard for example, shoot the image through treater control camera module 1. When a user inputs a shooting instruction, the processor receives the shooting instruction and controls the camera module 1 to shoot a shooting object according to the shooting instruction.

The image pickup module 1 in the electronic apparatus 100 according to the embodiment of the present application will be described in detail below.

Fig. 3 is a schematic structural diagram of a camera module according to an embodiment of the present disclosure; fig. 4 is an exploded view of fig. 3. Referring to fig. 3 and 4, the camera module 1 of the present embodiment includes a driving device 11, a lens 12, and an image sensor assembly 13.

Referring to fig. 3, the driving device 11 includes a housing 111, the housing 111 is hollow to form an accommodating space, and a mounting hole 111a is formed on one side surface of the housing 111; the lens 12 is mounted on the housing 111 through the mounting hole 111a, and a portion of the lens 12 is located inside the housing 111 and another portion of the lens 12 is exposed outside the housing 111.

Specifically, the light incident side of the lens 12 is located outside the housing 111, and the light exiting side of the lens 12 is located inside the housing 111. For example, the light incident side of the lens 12 corresponds to a light hole 211 on the back cover of the electronic device 100, external ambient light enters the lens 12 from the light incident side of the lens 12 through the light hole 211, the lens 12 is composed of one or more stacked lenses, for example, the optical axis of the lens 12 passes through the center of the lens, the lens condenses the incident light, and the condensed light exits from the light exiting side of the lens 12.

Referring to fig. 4, the image sensor assembly 13 is fixed in the housing 111, the image sensor assembly 13 is located on the light-emitting side of the lens 12, and the optical axis of the lens 12 exemplarily passes through the center of the image sensor assembly 13. The light emitted from the lens 12 enters the image sensor assembly 13, and the emergent light signal is converted into an electric signal through the photoelectric conversion function of the image sensor assembly 13, so that the imaging function of the camera module 1 is realized.

The housing 111 of the driving device 11 may include an outer frame 1111 and a bottom plate 1112, and the outer frame 1111 and the bottom plate 1112 jointly enclose an accommodating space of the housing 111. Taking the case that the outer frame 1111 faces the light-transmitting hole 211 of the rear cover of the electronic device 100, and the bottom plate 1112 faces away from the rear cover, the mounting hole 111a may be located on a surface of the outer frame 1111 opposite to the bottom plate 1112. The optical axis of the lens 12 may be perpendicular to the plane of the bottom plate 1112, the image sensor assembly 13 is disposed near the bottom plate 1112, and the image sensor assembly 13 is located in the space between the light-emitting side of the lens 12 and the bottom plate 1112.

With continued reference to fig. 4, image sensor assembly 13 may include an image sensor 131 and an electrical connection 132. The image sensor 131 is located on the light exit side of the lens 12, for example, the optical axis of the lens 12 passes through the center of the image sensor 131. The light emitted from the lens 12 is irradiated to the image sensor 131, and the image sensor 131 photoelectrically converts the light signal into an electrical signal, thereby realizing the imaging function of the camera module 1.

The electrical connection member 132 is used to electrically connect the image sensor 131 to an external circuit, and thus, control the image sensing operation through the external circuit. Specifically, one end of the electrical connector 132 is connected to the image sensor 131, and the other end of the electrical connector 132 is connected to an external circuit, for example, the other end of the electrical connector 132 is connected to the circuit board 4 in the electronic device 100. When the user takes a picture, the processor on the circuit board 4 controls the operation of the image sensor 131.

The image sensor 131 generates heat during operation, the heat is collected on the image sensor 131, which affects the performance of the image sensor 131, and in severe cases, the image sensor 131 cannot operate normally, so that heat dissipation needs to be performed on the image sensor 131. Therefore, as shown in fig. 4, the heat conductive liquid 14 is filled in the gap between the heat radiation surface of the image sensor 131 (the surface of the image sensor 131 facing the bottom plate 1112) and the bottom plate 1112, and the heat of the image sensor 131 is radiated by the heat conductive liquid 14. Through the heat conduction effect of the heat conduction liquid 14, the heat dissipation efficiency of the image sensor 131 can be improved, the heat dissipation effect of the image sensor 131 is improved, and the working performance of the image sensor 131 is ensured.

Further, an annular seal plate 15 is attached to the bottom plate 1112 of the housing 111, and the heat conductive liquid 14 is located in an area surrounded by the annular seal plate 15. The heat transfer liquid 14 is a flowable liquid, and the heat transfer liquid 14 is confined in an area surrounded by the annular seal plate 15 by providing the annular seal plate 15 on the bottom plate 1112. The area surrounded by the annular sealing plate 15 may correspond to a heat radiation surface of the image sensor 131.

A gap can be formed between the annular sealing plate 15 and the heat dissipation surface of the image sensor 131, so that the heat conduction liquid 14 is ensured to be fully contacted with the heat dissipation surface of the image sensor 131, and a certain flowing space is reserved for the heat conduction liquid 14 to expand when heated; further, the heat-conducting liquid 14 is prevented from overflowing the annular sealing plate 15 by the surface tension action of the heat-conducting liquid 14 in the gap between the surface of the annular sealing plate 15 and the heat radiating surface of the image sensor 131.

Referring to fig. 4, as an embodiment, a plurality of sealing holes 151 may be formed at intervals in the annular sealing plate 15, and the overflowing heat transfer liquid 14 is stored in the sealing holes 151 in a sealed manner, so that the heat transfer liquid 14 is prevented from overflowing out of the annular sealing plate 15. In other embodiments, instead of the seal hole 151, the surface of the annular seal plate 15 may be an uneven corrugated surface, and the extending direction of the corrugations of the corrugated surface may coincide with the extending direction of each side of the annular seal plate 15; alternatively, a plurality of strip-shaped grooves may be provided at intervals on the surface of the annular seal plate 15, and the strip-shaped grooves extend in the contour line direction of the annular seal plate 15.

The driving device 11 can drive the lens 12 to move, for example, the driving device 11 drives the lens 12 to move along the optical axis direction thereof, so as to realize the focusing function of the camera module 1. The driving device 11 will be described in detail below with reference to the lens 12.

Fig. 5 is a schematic structural diagram of a driving device according to an embodiment of the present application; fig. 6 is an exploded view of a driving device provided in an embodiment of the present application; fig. 7a is a structural diagram of the driving device provided in the embodiment of the present application after a housing is removed; FIG. 7b is a side view of FIG. 7 a; FIG. 8 is a view of the carrier of FIG. 7a with the carrier removed; FIG. 9 is a schematic structural diagram of a resilient guide provided in an embodiment of the present application; fig. 10a is a front view of a carrier provided by an embodiment of the present application; fig. 10b is a bottom view of a carrier provided by an embodiment of the present application; fig. 11 is a schematic structural diagram of a fixing element provided in an embodiment of the present application.

To facilitate the illustration of the internal structure of the driving device 11, the bottom plate 1112 of the housing 111 of the driving device 11 is removed in fig. 5 and 6, and as shown in fig. 5 and 6, the driving device 11 further includes a carrier 112, a fixing member 113, and a driving assembly, and the carrier 112, the fixing member 113, and the driving assembly are disposed in the housing 111.

The carrier 112 is used for supporting the lens 12 and driving the lens 12 to move, in practical applications, the carrier 112 may be an annular member, and the carrier 112 is sleeved on an outer sidewall of the lens 12. Along the optical axis direction of the lens 12, the light incident side of the lens 12 is exposed outside the housing 111 of the driving device 11, the bearing member 112 is located inside the housing 111, and the bearing member 112 is disposed close to the light emergent side of the lens 12.

The mount 113 is provided on one side of the carrier 112 in a layered manner in the optical axis direction of the lens 12, and the mount 113 is fixed in the housing 111. The fixing element 113 may be located on the light emitting side of the lens 12, that is, the fixing element 113 is disposed near the bottom plate 1112 of the housing 111; alternatively, the fixing member 113 may be located on a side of the carrier 112 away from the bottom plate 1112 of the housing 111, and an inner wall surface of the outer frame 1111 of the housing 111 provided with the mounting hole 111a is used as an inner top wall of the housing 111, that is, the fixing member 113 is located between the inner top wall of the housing 111 and the carrier 112.

As shown in fig. 6, a support column 1131 is disposed on a side surface of the fixing member 113 facing the carrier 112. Taking the fixing member 113 located on the light-emitting side of the lens 12 as an example, the fixing member 113 is located between the carrier 112 and the bottom plate 1112 of the housing 111, the surface of the fixing member 113 facing the bottom plate 1112 of the housing 111 can be abutted on the bottom plate 1112, the supporting column 1131 is located on the surface of the fixing member 113 departing from the bottom plate 1112, and the end of the supporting column 1131 is abutted on the inner top wall of the housing 111; taking the fixing member 113 close to the light incident side of the lens 12 as an example, the fixing member 113 is located between the inner top wall of the housing 111 and the supporting member 112, a surface of the fixing member 113 facing the inner top wall of the housing 111 may abut against the inner top wall, the supporting column 1131 is disposed on a surface of the fixing member 113 facing the bottom plate 1112 of the housing 111, and an end of the supporting column 1131 abuts against the bottom plate 1112. In this manner, the fixing member 113 is fixed in the housing 111 of the driving device 11.

Taking the case 111 of the driving device 11 as a cubic structure as an example, the outer contour of the fixing member 113 may be a rectangle matching with the case 111, and the supporting columns 1131 are disposed at least two opposite corners of the fixing member 113 to balance the support of the fixing member 113; furthermore, four corners of the fixing member 113 may be provided with support pillars 1131, so as to ensure the stability of the fixing member 113 in the housing 111.

In addition, in order to firmly fix the fixing member 113, the fixing member 113 may be fixedly connected to the housing 111 by welding, adhesion, or the like, while the fixing member 113 is supported in the housing 111 by the support column 1131. The fixing member 113 may be fixedly connected to the bottom plate 1112 of the housing 111 or the outer frame 1111 of the housing 111 according to the position of the fixing member 113 in the housing 111.

The driving assembly is connected between the fixing member 113 and the carrier 112, and the carrier 112 is driven to move by the driving assembly. Specifically, the driving component can drive the bearing component 112 to move along the optical axis direction of the lens 12, and the bearing component 112 drives the lens 12 to move along the optical axis direction thereof, so as to realize the focusing function of the lens 12.

Referring to fig. 6, the driving assembly includes an elastic guide 114 and a shape memory alloy wire, the elastic guide 114 is located between the supporting member 112 and the fixing member 113, the shape memory alloy wire is connected between the fixing member 113 and the elastic member, the connection portion of the shape memory alloy wire and the fixing member 113 is fixed, by changing the stretching state of the shape memory alloy wire, the shape memory alloy wire drives part of the structure of the elastic guide 114 to deform and move, and the elastic guide 114 drives the supporting member 112 to move.

It should be noted that Shape Memory Alloy (SMA) is an alloy material that can completely eliminate its deformation at a lower temperature after being heated and warmed, and recover its original Shape before being deformed, i.e. an alloy with a "Memory" effect. SMA is a thermo-elastic martensitic phase change material that undergoes a phase change when the temperature changes, and thus the stress state changes. In the low-temperature state, the SMA is in a martensite phase state; and when the temperature is increased, the SMA is transformed from a martensite phase to an austenite phase and generates deformation contraction.

Therefore, the SMA wire 115 can be contracted and deformed by applying a current to the shape memory alloy wire (hereinafter referred to as SMA wire) and heating the SMA wire 115 by the heating action of the current. And when no current flows in the SMA wire 115, it can be restored to the original state. In this way, by utilizing the stretching deformation of the SMA wire 115 when the power-on state changes, part of the structure of the elastic guide 114 is driven to deform and move, and the elastic guide 114 drives the bearing member 112 and the lens 12 to move, so as to adjust the distance between the lens 12 and the image sensor 131, thereby realizing the focusing function of the camera module 1.

Specifically, referring to fig. 7a, the SMA wire 115 is located on one side of the supporting member 112, taking an outer contour of the supporting member 112 as an example of a substantially cubic shape, the SMA wire 115 is located on one of four sides of the supporting member 112 in the circumferential direction, the SMA wire 115 extends along the extension direction of the outer side wall of the supporting member 112, two ends of the SMA wire 115 are respectively fixed to the fixing member 113 at positions corresponding to the side and close to the two ends, and a middle section of the SMA wire 115 is connected to the elastic guide member 114.

When the SMA wire 115 is not electrified, a line segment between the end part of the SMA wire 115 and the middle section of the SMA wire 115 is inclined relative to the surface of the fixed member 113, at this time, the SMA wire 115 is in an extended state, and the bearing member 112 is correspondingly located at a first position; after the SMA wire 115 is electrified, the SMA wire 115 contracts, the wire segment between the end part and the middle section of the SMA wire 115 is shortened, the included angle between the wire segment and the surface of the fixed part 113 becomes smaller, the SMA wire 115 approaches to be parallel to the surface of the fixed part 113, the SMA wire 115 contracts to generate displacement, part of the structure of the elastic guide part 114 is driven to generate elastic deformation and move, and the elastic guide part 114 drives the bearing part 112 to move to the second position.

Since the SMA wire 115 is located on one side of the carrier 112, for convenience of description, the orientation of the SMA wire 115 in the drive apparatus 11 is defined as the drive side of the drive apparatus 11, and the SMA wire 115 may be close to the edge of the drive side of the fixed member 113, and thus, the middle section of the SMA wire 115 may be connected to the drive side of the elastic guide 114.

In contrast, the SMA wire 115 deforms and contracts to generate an acting force on the driving side of the elastic guide 114, so as to drive the driving side of the elastic guide 114 to deform and move, the driving side of the elastic guide 114 drives the bearing component 112 to move, and the bearing component 112 moves from the first position to the second position; at this time, the elastic guide 114 generates an elastic force due to the driving side deformation. After the current in the SMA wire 115 is cut off, the SMA wire 115 returns to the extended state, the acting force of the SMA wire 115 on the driving side of the elastic guide 114 is eliminated, the elastic guide 114 can return to the original state by virtue of the elastic force of the elastic guide 114, and the bearing member 112 is driven to move from the second position to the first position.

It should be noted that, in this embodiment, the current flowing into the SMA wire 115 is controlled to make the magnitude of the current in the SMA wire 115 constant, and after the SMA wire 115 is electrified and contracted, the SMA wire 115 deforms and moves to the fixed position, so as to drive the driving side of the elastic guide 114 and the bearing member 112 to move to the second position. Thus, when the SMA wire 115 is in two states of being electrified and not electrified, the bearing member 112 is switched between the first position and the second position, the bearing member 112 cannot stop at a position between the first position and the second position, and the bearing member 112 drives the lens 12 to be switched between the far focus position and the near focus position, thereby realizing the two-stage focusing function of the lens 12.

In addition, in practical applications, according to the position relationship between the bearing element 112 and the fixing element 113 and the moving direction of the bearing element 112 after the current is applied to the SMA wire 115, when the SMA wire 115 is not energized, the first position where the bearing element 112 is located may be a far focus position, and when the SMA wire 115 is energized, the second position where the bearing element 112 is located may be a near focus position; alternatively, when the SMA wire 115 is not energized, the first position of the carrier 112 may be a near focus position, and when the SMA wire 115 is energized, the second position of the carrier 112 may be a far focus position.

Taking the laminated structure of the components in the driving assembly shown in fig. 6 as an example, if the fixing element 113 is located on the light-emitting side of the lens 12, that is, the fixing element 113 is located on the side of the supporting element 112 facing the bottom plate 1112 of the housing 111, as a case, when the SMA wire 115 is not electrified and the SMA wire 115 is not contracted, two ends of the SMA wire 115 are opposite to the surface of the fixing element 113, that is, the middle section of the SMA wire 115 is close to the fixing element 113, two ends of the SMA wire 115 are far away from the fixing element 113, and at this time, the supporting element 112 is located at a far focus position; after the SMA wire 115 is electrified and contracted, in the optical axis direction of the lens 12, the middle section of the SMA wire 115 moves to the positions of the two ends of the SMA wire 115, the driving side of the elastic guide member 114 is driven to move away from the fixed member 113, and the elastic guide member 114 drives the bearing member 112 to move to the near-focus position.

As another case, when the SMA wire 115 is not electrified and the SMA wire 115 is not contracted, two ends of the SMA wire 115 are close to the surface of the fixing member 113 relative to the middle section of the SMA wire 115, that is, two ends of the SMA wire 115 are close to the fixing member 113, and the middle section of the SMA wire 115 is far from the fixing member 113, at this time, the supporting member 112 and the fixing member 113 have a distance therebetween, and the supporting member 112 is in a near-focus position; after the SMA wire 115 is electrified and contracted, in the optical axis direction of the lens 12, the middle section of the SMA wire 115 moves to the positions of the two ends of the SMA wire 115, the driving side of the elastic guide member 114 is driven to move toward the fixed member 113, and the elastic guide member 114 drives the bearing member 112 to move to the far focus position.

Similarly, if the mount 113 is located on the side of the carrier 112 facing away from the bottom plate 1112 of the housing 111, as opposed to the stacked orientation of the carrier 112 and mount 113 shown in fig. 6, when the SMA wire 115 is not energized and the SMA wire 115 is not contracted, the two ends of the SMA wire 115 face away from the surface of the mount 113 relative to the segment thereof, and the carrier 112 is in the near focus position; after the SMA wire 115 is electrified and contracted, in the optical axis direction of the lens 12, the middle section of the SMA wire 115 moves to the positions of the two ends of the SMA wire 115, the driving side of the elastic guide member 114 is driven to move away from the fixed member 113, and the elastic guide member 114 drives the bearing member 112 to move to the far focus position.

As another case, when the SMA wire 115 is not electrified and the SMA wire 115 is not contracted, two ends of the SMA wire 115 are close to the surface of the fixing member 113 relative to the middle section, and at this time, the supporting member 112 and the fixing member 113 have a distance therebetween, and the supporting member 112 is in a far focus position; after the SMA wire 115 is electrified and contracted, in the optical axis direction of the lens 12, the middle section of the SMA wire 115 moves to the positions of the two ends of the SMA wire 115, the driving side of the elastic guide member 114 is driven to move toward the fixed member 113, and the elastic guide member 114 drives the bearing member 112 to move to the near-focus position.

Since the SMA wire 115 drives the elastic guide 114 to drive the carrier 112 to switch between the first position and the second position and the carrier 112 drives the lens 12 to switch between the far focus position and the near focus position when the SMA wire 115 is switched between the non-energized state and the energized state, in order to ensure the accuracy of the far focus position and the near focus position of the lens 12, the position of the carrier 112 can be limited by the fixing member 113 and the housing 111.

Specifically, according to the position relationship between the carrier 112 and the fixing member 113 and the arrangement orientation of the SMA wire 115, when the carrier 112 is located at one of the first position and the second position, the surface of the carrier 112 facing the fixing member 113 may abut against the fixing member 113 (through the elastic guide 114); when the carrier 112 moves from the above position to another position, a surface of the carrier 112 facing away from the fixing member 113 may abut against an inner wall of the housing 111.

Taking the fixing member 113 shown in fig. 6 as an example that the fixing member 113 is located on a side of the supporting member 112 facing the bottom plate 1112 of the housing 111, and when the SMA wire 115 is not electrified, two ends of the SMA wire face away from the surface of the fixing member 113, when the supporting member 112 is located at the first position, the supporting member 112 is close to the fixing member 113, and at this time, the surface of the supporting member 112 facing the fixing member 113 may abut against the fixing member 113 (through the elastic guide member 114); after the SMA wire 115 is electrified and contracted, the elastic guide 114 drives the carrier 112 to move to the second position in the direction away from the fixing member 113, and the carrier 112 is away from the fixing member 113, at this time, the surface of the carrier 112 away from the fixing member 113 (i.e., the surface of the carrier 112 facing the inner top wall of the housing 111) may abut against the inner top wall of the housing 111.

Continuing with the example that the fixing member 113 shown in fig. 6 is located on the side of the supporting member 112 facing the bottom plate 1112 of the housing 111, but when the SMA wire 115 is not energized, two ends of the SMA wire are close to the surface of the fixing member 113 relative to the middle segment thereof, when the supporting member 112 is located at the first position, the supporting member 112 is far away from the fixing member 113, and at this time, the surface of the supporting member 112 facing away from the fixing member 113 may abut against the inner top wall of the housing 111; after the SMA wire 115 is electrically contracted, the elastic guide 114 drives the carrier 112 to move to the second position towards the fixing member 113, the carrier 112 is close to the fixing member 113, and at this time, the surface of the carrier 112 facing the fixing member 113 can be abutted on the fixing member 113 (through the elastic guide 114).

Similarly to the fixing member 113 on the side of the carrier 112 facing the bottom plate 1112 of the housing 111, if the fixing member 113 is on the side of the carrier 112 facing the inner top wall of the housing 111, when the carrier 112 is switched between the first position and the second position, when the carrier 112 is located at a position close to the fixing member 113, the surface of the carrier 112 facing the fixing member 113 may abut (through the elastic guide 114) on the fixing member 113; when the carrier 112 is located away from the fixing member 113, a surface of the carrier 112 facing away from the fixing member 113 may abut against an inner wall of the housing 111, that is, a surface of the carrier 112 facing the bottom plate 1112 of the housing 111 abuts against the bottom plate 1112.

The specific structure of the interior of the driving device 11 will be described in detail below by taking the fixing member 113 shown in fig. 6 as an example, which is located on the side of the carrier 112 facing the bottom plate 1112 of the housing 111, and taking the surface of the SMA wire 115 facing away from the fixing member 113 when the SMA wire 115 is not electrified.

As shown in fig. 7a, in order to ensure that the SMA wire 115 carries the supporting member 112 by the elastic guide 114 to move smoothly, the distance between the two ends of the SMA wire 115 and the surface of the fixing member 113 (the surface of the fixing member 113 facing the supporting member 112) may be equal, and the lengths of the wire segments on the two sides of the middle section of the SMA wire 115 may be the same. Thus, when the SMA wire 115 is not contracted, the included angles between the line segments on the two sides of the middle section of the SMA wire 115 and the surface of the fixing member 113 are equal, and after the SMA wire 115 is electrified and contracted, the deformation degree and the moving amplitude of the line segments on the two sides of the middle section of the SMA wire 115 are the same, so that the balance of the bearing member 112 in the first position and the second position can be ensured, the moving balance of the lens 12 is ensured, the precision of the optical axis of the lens 12 is improved, and the focusing effect of the lens 12 is improved.

In practical applications, an electrically conductive structure is also typically disposed in the driving device 11, and the SMA wire 115 is electrically connected to an external circuit through the electrically conductive structure, so as to pass current through the SMA wire 115. Because the fixed member 113 is fixedly disposed in the driving device 11, the two ends of the SMA wire 115 connected to the fixed member 113 are fixed ends, and after the SMA wire 115 is powered on, the portion between the two ends of the SMA wire 115 is deformed and moved, so as to supply current to the SMA wire 115, the conductive structure may be mounted on the fixed member 113, and the two ends of the SMA wire 115 may be fixed to the conductive structure. Through the conductive structure installed on the fixing member 113, both ends of the SMA wire 115 can be fixed, and current can be supplied to the SMA wire 115.

Specifically, referring to fig. 8, the conductive structure includes a first conductive pillar 116 and a second conductive pillar 117, the first conductive pillar 116 and the second conductive pillar 117 are both disposed at the driving side of the fixing member 113, the first conductive pillar 116 and the second conductive pillar 117 are respectively disposed near two ends of the driving side of the fixing member 113, and two ends of the SMA wire 115 are respectively connected to the first conductive pillar 116 and the second conductive pillar 117.

Two ends of the SMA wire 115 are respectively connected to the portions of the first conductive pillar 116 and the second conductive pillar 117 located inside the casing 111 of the driving device 11, and both the first conductive pillar 116 and the second conductive pillar 117 extend out of the casing 111 to be connected to an external circuit, wherein one of the first conductive pillar 116 and the second conductive pillar 117 is connected to the positive electrode of the external circuit, and the other is connected to the negative electrode of the external circuit. Taking a mobile phone as an example, the first conductive pillar 116 and the second conductive pillar 117 may be electrically connected to the circuit board 4 inside the mobile phone.

Continuing to refer to fig. 8, taking the outer contour of the fixing element 113 as a rectangle as an example, two ends of the driving side of the fixing element 113 may be provided with supporting pillars 1131, the first conductive pillar 116 and the second conductive pillar 117 may be respectively disposed corresponding to the supporting pillars 1131 at two ends of the driving side of the fixing element 113, and both the first conductive pillar 116 and the second conductive pillar 117 are abutted against the side wall of the corresponding supporting pillar 1131, so that the first conductive pillar 116 and the second conductive pillar 117 are ensured to be firmly connected with the fixing element 113 by the supporting effect of the corresponding supporting pillar 1131 on the first conductive pillar 116 and the second conductive pillar 117.

In this embodiment, the SMA wire 115 and the elastic guide 114 drive the bearing member 112 to move along the optical axis direction of the lens 12, the elastic guide 114 is located between the bearing member 112 and the fixing member 113, and the SMA wire 115 is disposed on one side of the driving device 11, so that the space occupied by the driving component can be reduced, and thus, the volume of the driving device 11 is reduced, which is beneficial to the light and thin of the driving device 11.

Furthermore, in order to ensure that the supporting member 112 moves smoothly from the first position to the second position, referring to fig. 9, in this embodiment, the elastic guide 114 may include a movable portion 1141, a deformable portion 1142 and a fixed portion 1143, the movable portion 1141 corresponds to one side where the SMA wire 115 is disposed, the movable portion 1141 extends along an extending direction of a driving side edge of the supporting member 112, the deformable portion 1142 and the fixed portion 1143 are sequentially connected to an end portion of the movable portion 1141, the deformable portion 1142 is located between the movable portion 1141 and the fixed portion 1143, and the deformable portion 1142 extends toward an opposite side of the movable portion 1141.

The movable portion 1141 of the elastic guide 114 is fixedly connected to the carrier 112, the fixed portion 1143 of the elastic guide 114 is fixedly connected to the fixing member 113, and the deformation portion 1142 is a portion of the elastic guide 114 that can be deformed.

Specifically, referring to fig. 8, the middle section of the SMA wire 115 is connected to the movable portion 1141, and taking as an example that when the SMA wire 115 is not contracted and the supporting member 112 is located at the first position, the elastic guide 114 is attached to the fixed member 113, at this time, the elastic guide 114 is attached to the fixed member 113, and the elastic guide 114 is not deformed and is not acted; after the SMA wire 115 contracts and deforms, the SMA wire 115 drives the movable portion 1141 of the elastic guide 114 to move in a direction away from the fixed member 113, the movable portion 1141 of the elastic guide 114 drives the supporting member 112 to move in a direction away from the fixed member 113, and the fixed portion 1143 of the elastic guide 114 is fixed on the fixed member 113, so that the fixed portion 1143 of the elastic guide 114 is not moved, and the deformation portion 1142 located between the movable portion 1141 and the fixed portion 1143 deforms due to acting forces in opposite directions (the movable portion 1141 and the fixed portion 1143), and the deformation portion 1142 deforms to enable the elastic guide 114 to generate an elastic force in an opposite direction to the acting force of the SMA wire 115.

Thus, in the process that the SMA wire 115 and the elastic guide 114 drive the bearing component 112 to move and when the bearing component 112 is located at the second position, the tensile force of the SMA wire 115 on the movable part 1141 of the elastic guide 114 and the elastic force generated by the deformation of the elastic guide 114 are both located at the driving side of the driving device 11, so that the bearing component 112 can be prevented from tilting or overturning; moreover, as mentioned above, the line segments on both sides of the middle section of the SMA wire 115 are stressed in a balanced manner, so that the parts of the bearing member 112 corresponding to both sides of the middle section of the SMA wire 115 are stressed in a balanced manner, so that the driving assembly drives the bearing member 112 to move stably, thereby ensuring the accuracy of the optical axis when the lens 12 moves from the far focus position to the near focus position.

In addition, after the power supply to the SMA wire 115 is finished, the SMA wire 115 recovers the extended state to drive the supporting member 112 to return to the first position, due to the elastic force of the deformation portion 1142 of the elastic guide member 114, the moving speed of the supporting member 112 to the first position can be increased, so that the supporting member 112 returns rapidly, the rapid switching of the supporting member 112 between the first position and the second position is realized, and further, the rapid focusing of the lens 12 between the near-focus position and the far-focus position is realized.

As shown in fig. 9, as an embodiment, the deformable portion 1142 and the fixed portion 1143 may be connected to both ends of the movable portion 1141, and the elastic guide 114 is a symmetrical structure with a center line of the movable portion 1141 in the width direction as a symmetry axis. As shown in fig. 8, when the SMA wire 115 drives the movable portion 1141 of the elastic guide 114 to move, the deformation portions 1142 on both sides deform, the elastic force is generated on both sides of the elastic guide 114, and the elastic force generated by the elastic guide 114 as a whole and the pulling force of the SMA wire 115 on the elastic guide 114 act on the same straight line, so as to improve the stress uniformity of the supporting member 112 and ensure the stress balance of the driving side of the supporting member 112. When the bearing member 112 moves from the first position to the second position, the bearing member 112 is always parallel to the guide member, so that the accuracy of the optical axis of the lens 12 is improved.

Moreover, one end of the deformation part 1142 of the elastic guide 114, which is connected to the fixing part 1143, may extend to a position close to the edge of the fixing part 113, and the fixing part 1143 is fixed to the edge of the fixing part 113, so that the length of the deformation part 1142 may be increased, that is, the overall length of the elastic guide 114 may be increased, the rigidity of the elastic guide 114 may be reduced, the deformation of the elastic guide 114 may be buffered, the reliability of the elastic guide 114 may be improved, and the failure of the elastic guide 114 may be avoided; in addition, since the rigidity of the elastic guide 114 is weakened, the elastic guide 114 is more easily deformed, and the pulling force required to pull up the movable portion 1141 of the elastic guide 114 can be reduced, thereby extending the service life of the SMA wire 115.

The deformable portion 1142 of the elastic guide 114 and the fixed portion 1143 may further have a bent back section 1144 therebetween, for example, as shown in fig. 9, the deformable portions 1142 on two sides of the elastic guide 114 extend in a direction approaching each other on the opposite side of the movable portion 1141. As shown in fig. 8, by providing the bent section 1144 at the end of the deformation portion 1142, the fixing portion 1143 extends in a direction opposite to the extending direction of the deformation portion 1142, and the fixing portion 1143 is located at the outer side of the deformation portion 1142, i.e. the fixing portion 1143 is closer to the edge of the fixing member 113 than the deformation portion 1142; alternatively, the fixing portion 1143 may be located inside the deformation portion 1142, and the deformation portion 1142 is closer to the edge of the fixing member 113 than the fixing portion 1143.

By arranging the bent back section 1144 between the deformation portion 1142 and the fixing portion 1143, the deformation portion 1142 extends to the opposite side of the movable portion 1141, increasing the length of the deformation portion 1142, reducing the rigidity of the elastic guide 114, improving the reliability of the elastic guide 114, and reducing the pulling force required by the SMA wire 115 to pull up the movable portion 1141 of the elastic guide 114; the fixing portions 1143 are disposed on the opposite side of the movable portion 1141, and the fixing portions 1143 on both sides extend from the central portion of the side to both ends of the side, so that the length of the fixing portions 1143 is increased, the fixing area of the fixing portions 1143 on the fixing member 113 is enlarged, and the connection strength between the fixing portions 1143 and the fixing member 113 is enhanced.

For the fixed connection between the movable portion 1141 of the elastic guide 114 and the carrier 112, referring to fig. 9, a bent portion 1148 may extend from the outer edge of the movable portion 1141, and as shown in fig. 8, the bent portion 1148 extends along the outer sidewall of the carrier 112, and the movable portion 1141 is connected to the driving side of the carrier 112 by fixing the bent portion 1148 to the outer sidewall of the carrier 112.

In order to firmly connect the movable portion 1141 with the outer sidewall of the supporting member 112, a plurality of bent portions 1148 may be disposed at intervals on the outer edge of the movable portion 1141, and the regions of the movable portion 1141 corresponding to the two sides of the middle section of the SMA wire 115 are both provided with the bent portions 1148, and the portions of the movable portion 1141 located at the two sides of the middle section of the SMA wire 115 are both connected with the outer sidewall of the supporting member 112, so as to prevent the supporting member 112 from being unbalanced in force when the SMA wire 115 drives the supporting member 112 to move through the movable portion 1141 of the elastic guide 114.

For example, referring to fig. 8, one bending portion 1148 is disposed on the movable portion 1141 of the elastic guide 114 corresponding to two sides of the middle section of the SMA wire 115, one bending portion 1148 is disposed on each of the two ends of the movable portion 1141 connected to the two side deformation portions 1142, and the bending portions 1148 of the two ends of the movable portion 1141 are connected to the two side walls of the supporting member 112 on the driving side.

The bent portion 1148 extending from the movable portion 1141 of the elastic guide 114 can be fixed on the outer sidewall of the carrier 112 by welding or bonding, for example, as shown in fig. 10a, a fixing groove 1123 is provided on the outer sidewall of the carrier 112 corresponding to the bent portion 1148 of the elastic guide 114, the fixing groove 1123 is recessed from the outer sidewall to the inner sidewall of the carrier 112, and a weld or an adhesive region is formed in a space between the bent portion 1148 and the fixing groove 1123 to weld or bond the bent portion 1148 on the carrier 112.

With continued reference to fig. 9, for the connection between the middle section of the SMA wire 115 and the movable portion 1141 of the elastic guide 114, specifically, a connecting plate 1145 is disposed on the movable portion 1141 at a position corresponding to the middle portion of the outer sidewall of the driving side of the supporting member 112, the connecting plate 1145 extends from the outer edge of the movable portion 1141 to the edge of the fixing member 113, the middle section of the SMA wire 115 bypasses both sides of the connecting plate 1145, and when the SMA wire 115 is in an extended state without being energized, the middle section of the SMA wire 115 is hung on the connecting plate 1145 in a tensioned state.

By disposing the connecting plate 1145 in the middle of the movable portion 1141, the distance from the connecting plate 1145 to the first conductive pillar 116 and the second conductive pillar 117 on both sides is equal, so as to ensure the force balance of the line segments on both sides of the middle section of the SMA wire 115. Illustratively, when the flexible guide 114 is in its natural state, the connecting plate 1145 may extend in the direction of the plane of the guide, and the connecting plate 1145 may abut against the surface of the guide.

First draw-in groove 1146 and second draw-in groove 1147 have been seted up respectively on the lateral wall of the both sides of connecting plate 1145, the notch of first draw-in groove 1146 and second draw-in groove 1147 is located the lateral wall of the both sides of connecting plate 1145 respectively, and first draw-in groove 1146 and second draw-in groove 1147 all extend to the centre of connecting plate 1145, it is shown with fig. 8 to combine, the both sides of the middle section of SMA wire 115 are blocked respectively in first draw-in groove 1146 and second draw-in groove 1147, through the restriction of the cell wall of first draw-in groove 1146 and the cell wall of second draw-in groove 1147, avoid the middle section of SMA wire 115 to break away from connecting plate 1145, ensure that the middle section of SMA wire 115 is connected stably with connecting plate 1145.

In addition, it will be appreciated that the SMA wire 115 may be deformed by contraction when energized, and that the length of the SMA wire 115 on the web 1145 may vary.

To enhance the buffering effect of the movable portion 1141 on the SMA wire 115, referring to fig. 9, the middle section of the SMA wire 115 is connected to the connecting plate 1145 of the movable portion 1141, and the bottom of the first slot 1146 on the connecting plate 1145 may form a first buffering wall 1146a, the bottom of the second slot 1147 may form a second buffering wall 1147a, and the distance between the first buffering wall 1146a and the second buffering wall 1147a gradually decreases from the inner edge to the outer edge of the movable portion 1141.

As for the connecting plate 1145 provided on the outer edge of the movable portion 1141, a connection portion between the connecting plate 1145 and the movable portion 1141 is formed at a portion between the first buffer wall 1146a and the second buffer wall 1147a, and a distance between the first buffer wall 1146a and the second buffer wall 1147a gradually decreases from the inner edge to the outer edge of the movable portion 1141, so that the connection portion between the connecting plate 1145 and the movable portion 1141 is formed in an "inverted cone" structure. When the pulling force of the SMA wire 115 on the movable portion 1141 is too large, the connection portion between the connection plate 1145 and the movable portion 1141 may generate torsional deformation toward the moving direction of the SMA wire 115 to buffer the acting force of the SMA wire 115, so as to ensure that the acting force on the SMA wire 115 is not suddenly increased when the SMA wire 115 drives the bearing member 112 to the second position, thereby prolonging the service life of the SMA wire 115.

Referring to fig. 7b, when the connection portion between the connection plate 1145 and the movable portion 1141 is subjected to an excessive force, a torsion deformation may be generated, and on the basis of buffering the acting force of the SMA wire 115, a stop 1121 may further extend from a portion of the outer side wall of the carrier 112 corresponding to the connection plate 1145, the stop 1121 may be disposed above the connection plate 1145, and a gap may be formed between the stop 1121 and the connection plate 1145. When the connecting portion between the connecting plate 1145 and the movable portion 1141 is deformed by torsion, and the connecting plate 1145 is driven to deflect toward the stop 1121, the stop 1121 can limit the deflection degree of the connecting plate 1145; by abutting the edge of the connecting plate 1145 against the stopper 1121, the excessive deflection of the connecting plate 1145 is avoided, so that the connecting portion between the connecting plate 1145 and the movable portion 1141 is prevented from cracking or even breaking, and the service life of the elastic guide 114 is prolonged.

In addition, referring to fig. 10a, a surface of the carrier 112 facing away from the fixing member 113 may be provided with a limit boss 1122, and when the carrier 112 moves from the first position to the second position, the limit boss 1122 abuts against an inner wall of the housing 111 of the driving device 11. By providing the limit boss 1122 on the surface of the carrier 112, friction between the carrier 112 and the inner wall of the housing 111 is reduced by the contact of the limit boss 1122 with the inner wall of the housing 111.

The interval is provided with two at least spacing bosss 1122 on the surperficial of carrier 112, and spacing boss 1122 through the interval setting is in the butt with casing 111 inner wall to it is stable with casing 111 inner wall contact to make carrier 112, guarantees the stability when carrier 112 is located the second position. Referring to fig. 10a, at least two limiting bosses 1122 of the plurality of limiting bosses 1122 are located at two sides of the middle section of the SMA wire 115, respectively, so that portions of the supporting member 112 corresponding to the two sides of the middle section of the SMA wire 115 are in contact with the inner wall of the housing 111 through the limiting bosses 1122.

When the SMA wire 115 drives the supporting member 112 to move to the second position, the acting forces generated by the contraction deformation of the wire segments on the two sides of the middle section of the SMA wire 115 are respectively transmitted to the limiting bosses 1122 on the two sides, so that the two sides of the supporting member 112 are stressed in a balanced manner, and when the supporting member 112 is located at the second position, the supporting member 112 and the inner wall of the housing 111 are kept horizontal, thereby preventing the supporting member 112 from inclining or overturning.

In order to prevent the carrier 112 from deflecting or tilting during the movement, the carrier 112 and the guide are further provided with mutually matched guide structures, as shown in fig. 10b and 11, for example, a positioning boss 1124 is provided on a side surface of the carrier 112 facing the fixing member 113, for example, the positioning boss 1124 is provided on an inner edge of the carrier 112, and the positioning boss 1124 protrudes toward the fixing member 113; the fixing member 113 is provided with an avoiding recess 1132, the position of the avoiding recess 1132 corresponds to the position of the positioning boss 1124, for example, the avoiding recess 1132 is located on the inner edge of the fixing member 113 and extends from the inner edge of the fixing member 113 to the outer edge direction.

The positioning boss 1124 on the bearing member 112 is clamped into the avoiding recess 1132 on the fixing member 113, and when the bearing member 112 moves relative to the fixing member 113, the side wall of the positioning boss 1124 moves along the side wall of the avoiding recess 1132, so that the movement of the bearing member 112 is guided and limited, and the deflection or inclination of the bearing member 112 is avoided.

In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, an indirect connection via an intermediary, a connection between two elements, or an interaction between two elements. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the embodiments of the application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

Claims

1. A driving device is used for driving a lens of a camera module to move and is characterized by comprising a bearing piece, a fixing piece and a driving assembly, wherein the bearing piece and the fixing piece are arranged in a stacked mode along the optical axis direction of the lens;

2. The drive device according to claim 1, wherein when the shape memory alloy wire is not contracted, the distance between both ends of the shape memory alloy wire and the surface of the fixing member facing the carrier is equal, and the lengths of line segments on both sides of the middle section of the shape memory alloy wire are equal.

3. The drive device according to claim 2, wherein the two ends of the shape memory alloy wire face away from the surface of the fixing member opposite the middle section when the shape memory alloy wire is not contracted;

4. The driving device as claimed in any one of claims 1 to 3, wherein the elastic guide comprises a movable portion, a deformable portion and a fixed portion, the movable portion is located on one side of the carrier, the deformable portion and the fixed portion are connected to at least one end of the movable portion, the deformable portion is located between the movable portion and the fixed portion, and the deformable portion extends from one side of the carrier to an opposite side of the carrier;

wherein the movable part is fixed on the bearing part, the fixed part is fixed on the fixed part, and the middle section of the shape memory alloy wire is connected on the movable part.

5. The driving device as claimed in claim 4, wherein the deformation portion and the fixing portion are connected to both ends of the movable portion.

6. The driving apparatus as claimed in claim 5, wherein an end of the deformation portion connected to the fixing portion extends to be close to an edge of the fixing member.

7. The driving device as claimed in claim 6, wherein a bent back section is provided between the deformation part and the fixing part.

8. The drive device according to any one of claims 4 to 7, wherein a connecting plate is provided on the movable portion at a position corresponding to a middle portion of an outer side wall of the carrier, the connecting plate protruding from an outer edge of the movable portion toward an edge of the fixed member, and a middle portion of the shape memory alloy wire is wound around both sides of the connecting plate.

9. The driving device according to claim 8, wherein a first engaging groove and a second engaging groove are respectively formed on two sides of the connecting plate, the first engaging groove and the second engaging groove respectively extend from two sides of the connecting plate to the middle of the connecting plate, and two sides of the middle section of the shape memory alloy wire are respectively engaged with the first engaging groove and the second engaging groove.

10. The drive device according to claim 9, wherein a groove bottom of the first engaging groove forms a first buffer wall, a groove bottom of the second engaging groove forms a second buffer wall, and a distance between the first buffer wall and the second buffer wall gradually decreases in a direction from an inner edge of the movable portion to an outer edge of the movable portion.

11. The driving device as claimed in claim 10, wherein a stop is protruded from an outer side wall of the carrier, the stop corresponds to the connecting plate, and a gap is formed between the stop and the connecting plate.

12. The drive of any one of claims 4 to 11, wherein the outer edge of the movable portion has at least one bend extending therefrom, the bend extending along and fixedly connected to an outer side wall of the carrier.

13. The drive of any one of claims 1-12, further comprising a housing that fits over the carrier, the mount, and the drive assembly.

14. The drive of claim 13, wherein when the carrier is in the first position, a surface of the carrier facing the mount abuts against the mount, and when the carrier is in the second position, a surface of the carrier facing away from the mount abuts against an inner wall of the housing;

or, when the bearing piece is located at the first position, the surface of the bearing piece departing from the fixing piece is abutted to the inner wall of the shell, and when the bearing piece is located at the second position, the surface of the bearing piece facing the fixing piece is abutted to the fixing piece.

15. The drive device as claimed in claim 14, characterized in that the surface of the carrier facing away from the fixing element is provided with at least one stop lug for abutment with an inner wall of the housing.

16. The driving device as claimed in claim 15, wherein the surface of the bearing member facing away from the fixing member is provided with at least two limiting bosses, and the at least two limiting bosses are respectively correspondingly positioned at two sides of the middle section of the shape memory alloy wire.

17. The driving apparatus as claimed in any one of claims 1 to 16, wherein the fixing member has a first conductive pillar and a second conductive pillar respectively disposed at two ends of a side thereof corresponding to the shape memory alloy wire, and the shape memory alloy wire has two ends respectively connected to the first conductive pillar and the second conductive pillar.

18. The driving apparatus as claimed in any one of claims 1 to 17, wherein the supporting member is disposed on an outer sidewall of the lens, and the fixing member is disposed on a light-emitting side of the lens.

19. A camera module comprising a lens and the driving unit according to any one of claims 1 to 18, wherein a mounting hole is provided on a side surface of a housing of the driving unit, and the lens is accommodated in the housing through the mounting hole.

20. An electronic device comprising at least one camera module of claim 19.