CN115980958A

CN115980958A - Miniature drive arrangement and module of making a video recording

Info

Publication number: CN115980958A
Application number: CN202310082732.9A
Authority: CN
Inventors: 曾琳; 陈洪; 刘述伦; 夏念明
Original assignee: Guangdong Haideya Technology Co ltd
Current assignee: Henan Haoze Electronics Co ltd Kunshan Branch
Priority date: 2023-01-18
Filing date: 2023-01-18
Publication date: 2023-04-18

Abstract

The invention relates to the technical field of images, and discloses a micro driving device and a camera module, which comprise a fixed base and a first rotor, wherein the first rotor is connected with the fixed base in a sliding manner and is connected with a first driving assembly, and the first driving assembly is used for driving the first rotor to move along a first direction; the first rotor is connected with a second rotor in a sliding mode, the top of the second rotor is connected with a second driving assembly, and the second driving assembly is used for driving the second rotor to move along a first direction; the first direction is a central axis direction of the second mover. According to the invention, the first driving component and the second driving component are used for driving the lens on the second rotor to achieve a longer movement stroke, the defect that the movement stroke of the existing driving motor is shorter is overcome, the long-distance micro-distance focusing treatment is realized, and the micro-distance shooting effect is ensured.

Description

Miniature drive arrangement and module of making a video recording

Technical Field

The invention relates to the technical field of images, in particular to a micro driving device and a camera module.

Background

With the development of optical imaging technology, the camera function of the portable electronic device is usually realized by a miniature lens, and a camera module configured by the miniature lens needs to meet the use requirements of long-focus shooting and macro-shooting.

The mobile phone on the market usually adopts the voice coil motor to drive the module of making a video recording and carry out the processing of focusing, when being in the macro-shooting, because of being close with the shooting distance of object, then needs the voice coil motor to possess great motion stroke and order about to shoot the module and be close to the object. The camera module that possesses long focus shooting function usually because the stroke of its voice coil motor is short, when the focus distance has surpassed the maximum stroke of voice coil motor, often leads to the camera module to be difficult to focus when carrying out the macro-shooting, leads to the shooting effect not good.

Therefore, it is an important subject of research by those skilled in the art to find a micro-driving device and an image pickup module that can solve the above-mentioned technical problems.

Disclosure of Invention

The invention discloses a micro driving device and a camera module, which are used for solving the technical problems that the driving stroke of the existing voice coil motor is short and the micro-distance shooting effect is difficult to meet.

In order to achieve the purpose, the invention adopts the following technical scheme:

a micro driving device comprises a fixed base and a first rotor which is connected with the fixed base in a sliding mode, wherein the first rotor is connected with a first driving assembly, and the first driving assembly is used for driving the first rotor to move along a first direction;

the first rotor is connected with a second rotor in a sliding mode, the top of the second rotor is connected with a second driving assembly, and the second driving assembly is used for driving the second rotor to move along the first direction; the first direction is a central axis direction of the second mover.

Optionally, the first driving assembly includes a first mover fixing member disposed between the fixed base and the first mover, two opposite sides of the first mover fixing member in the first direction are respectively provided with a set of first stator fixing members, and each set of first stator fixing members includes at least one first stator fixing member;

the first rotor fixing piece is connected with the first stator fixing piece through a shape memory alloy;

the shape memory alloy is an alloy that can correspondingly stretch/contract according to temperature and/or applied external force, and the alloy is configured to have a shape memory effect caused by temperature.

Optionally, the second driving assembly includes a second mover fixing member disposed at a top of the second mover, and two opposite sides of the second mover fixing member in the first direction are respectively provided with a set of second stator fixing members, where each set of second stator fixing members includes at least one second stator fixing member;

the second rotor fixing piece is connected with the second stator fixing piece through another shape memory alloy.

Optionally, the set of first stator fixing parts includes two first stator fixing parts respectively connected to two ends of the first rotor fixing part, and two shape memory alloys connected to each end of the first rotor fixing part are arranged in a crossing manner;

the second stator fixing pieces comprise two second stator fixing pieces which are respectively connected with two ends of the second rotor fixing piece, and the two shape memory alloys connected with each end of the second rotor fixing piece are arranged in a crossed mode.

Optionally, the first mover is provided with conductive elastic members on two opposite sides in the first direction, respectively; the conductive elastic element is electrically connected with the shape memory alloy of the second driving assembly and is used for electrifying and deenergizing the shape memory alloy of the second driving assembly.

Optionally, a conductive member is disposed on the fixing base, the conductive member is electrically connected to the shape memory alloy of the first driving assembly, and the conductive member is configured to energize and de-energize the shape memory alloy of the first driving assembly.

Optionally, four corners of the fixed base respectively extend upward to form a fixed column, the first driving assembly further includes a set of sliding guide shafts, and the set of sliding guide shafts includes at least one sliding guide shaft; two ends of the sliding guide shaft are respectively fixedly connected with one fixed column, and the second rotor is slidably sleeved on the sliding guide shaft;

the central axis of the sliding guide shaft is parallel to the first direction.

Optionally, through holes for penetrating the sliding guide shafts are respectively formed in two opposite sides of the first rotor; the first rotor and the second rotor are connected to the same group of sliding guide rails in a sliding mode.

Optionally, both ends of the through hole are provided with storage grooves for storing lubricating grease.

Optionally, a magnetic member is disposed on a groove edge of the storage groove, and another magnetic member is disposed at a position corresponding to the magnetic member on each of the fixing columns.

Optionally, one side of the second mover is connected to a third driving assembly, and the other side of the second mover is connected to a fourth driving assembly, so as to drive the second mover to move along the first direction in multiple stages.

A camera module comprises a shell, wherein a containing cavity is arranged in the shell, and a driving device as above is arranged in the containing cavity;

the second rotor is arranged on the base, and the driving device is used for driving the second rotor to adjust the focusing distance of the second rotor.

Optionally, the outer surfaces of the outer shell and the fixed base are coated with sticky dust coatings.

According to the technical scheme, the embodiment of the invention has the following advantages:

the first rotor is driven to move along a first direction through the first driving assembly, and the second rotor is driven to synchronously move for the same distance; and the second driving component drives the second rotor to move along the first direction, so that the second rotor moves to a farther distance relative to the first rotor, the distance between a lens on the second rotor and a shot object is closer, and a better macro shooting effect is achieved.

Compared with the prior art, the invention realizes driving the lens on the second rotor to reach larger movement stroke through the first driving assembly and the second driving assembly, overcomes the defect of shorter movement stroke of the existing driving motor, realizes the micro-distance focusing processing with longer distance and ensures the effect of micro-distance shooting.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is an overall view of a micro-actuator;

FIG. 2 is an internal structural view of a micro-actuator;

fig. 3 is a structural view of a second mover;

fig. 4 is a structural view of a first mover;

FIG. 5 is a view showing the structure of the fixing base;

FIG. 6 is an overall view of a camera module;

illustration of the drawings: the movable type piezoelectric actuator comprises a fixed base 1, a first rotor 2, a second rotor 3, a conductive elastic part 4, a conductive part 5, a magnetic part 6, a shell 7, a lens 8, a first driving assembly 100, a first stator fixing part 101, a first rotor fixing part 102, a second driving assembly 200, a second stator fixing part 201, a second rotor fixing part 202, a fixed column 11, a sliding guide shaft 12, a storage groove 13, a through hole 14, a shape memory alloy 15 and a mounting groove 31.

Detailed Description

In the description of the present application, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

Example one

The micro driving device in this embodiment can be used for driving the lens to focus, and can also be used for driving elements such as a reflection prism, a reflection lens, a sensor, and the like.

Referring to fig. 1 to 5, a micro driving device includes a fixed base 1 and a first mover 2 slidably connected to the fixed base 1, a first driving assembly 100 is disposed between the fixed base 1 and the first mover 2, and the first driving assembly 100 is configured to drive the first mover 2 to move along a first direction relative to the fixed base 1;

the first rotor 2 is slidably connected with a second rotor 3, a second driving assembly 200 is arranged on one side of the top of the second rotor 3, and the second driving assembly 200 is used for driving the second rotor 3 to move along a first direction; the first direction is a central axis direction of the second mover 3.

Specifically, the first driving assembly 100 drives the first mover 2 to move relative to the fixed base 1, that is, the first mover 2 can be driven to move back and forth along a first direction, and the first mover 2 is connected to the second mover 3, so that the second mover 3 can be driven to move by the same distance; and then the second driving assembly 200 drives the second mover 3 to move relative to the first mover 2, that is, the second mover 3 can be driven to move continuously along the first direction, so as to achieve a longer moving distance, thereby enabling the lens on the second mover 3 to have a larger moving stroke and to be closer to the object to be shot, and further ensuring a better macro-shooting effect.

It should be noted that the first direction is a central axis direction of the second mover 3, i.e., a direction of an X axis in fig. 1; moving back and forth in a first direction, corresponding to moving in the X + direction and moving in the X-direction in fig. 1. Above-mentioned design arranges drive assembly through the bottom and the top at second active cell 3 and orders about second active cell 3 along the back-and-forth movement on the first direction, and easy operation is convenient, and efficiency is higher, more is applicable to portable electronic equipment's shooting needs.

It should be noted that the first mover 2 is a fixed base with conductive performance, and may be a conductive metal base specifically; the second mover 3 is a fixing base for mounting an optical element, and may be a lens fixing base, a prism fixing base, a reflector fixing base, or a sensor fixing base.

Further, the first driving assembly 100 includes a first mover fixing member 102 disposed between the fixed base 1 and the first mover 2, two opposite sides of the first mover fixing member 102 in the first direction are respectively provided with a set of first stator fixing members 101, and each set of first stator fixing members 101 includes at least one first stator fixing member 101; the first stator fixing member 101 is connected to the first stator fixing member 102 through a shape memory alloy 15.

The shape memory alloy 15 in the present embodiment is an alloy that can be expanded/contracted according to temperature and/or applied external force, and the alloy is configured to have a shape memory effect caused by temperature. When the alloy is affected by temperature rise, the corresponding alloy is shortened in length, and when the alloy is affected by temperature drop, the corresponding alloy is lengthened; or when the alloy is affected by temperature reduction, a certain external force is applied to the alloy, so that the alloy can be correspondingly extended, namely, the alloy can be extended or shortened by matching the shape memory effect caused by the temperature with the external force, and then the first rotor fixing part 102 and the second rotor fixing part 202 are driven to move back and forth along the first direction.

Specifically, the first driving assembly 100 includes a first mover fixing member 102 fixedly connected to one side of the bottom of the first mover 2, and a set of first stator fixing members 101 respectively disposed at opposite sides of the first mover fixing member 102; preferably, the group of first stator fixing members 101 includes two first stator fixing members 101, that is, the total number of the first stator fixing members 101 is four, and the four first stator fixing members are respectively and fixedly connected to four corners of the top of the fixing base 1; the first rotor fixing member 102 is in an i-shaped structure, two ends of the first rotor fixing member 102 are fixedly connected to the bottom of the first rotor 2, and a shape memory alloy 15 is connected between the first rotor fixing member 102 and each first stator fixing member 101;

the first driving assembly 100 drives the first mover 2 to move in the following specific process: when the two shape memory alloys 15 positioned in the X + direction are electrified and heated, the length of the two shape memory alloys 15 is shortened, and simultaneously, the length of the two shape memory alloys 15 positioned in the X-direction is elongated after the two shape memory alloys 15 are electrified and cooled, so that the first rotor fixing member 102 moves in the X + direction relative to the fixed base 1, and the first rotor 2 is driven to move; when the two shape memory alloys 15 located in the X-direction are powered on and heated up, the length of the two shape memory alloys 15 is shortened, and simultaneously, the two shape memory alloys 15 located in the X + direction are powered off and cooled down, and the length of the two shape memory alloys 15 is extended, so that the first rotor fixing member 102 moves in the X-direction relative to the fixed base 1, and the first rotor 2 is driven to move.

Further, the second driving assembly 200 includes a second mover fixing member 202 disposed at the top of the second mover 3, a set of second stator fixing members 201 are respectively disposed at two opposite sides of the second mover fixing member 202 in the first direction, and each set of second stator fixing members 201 includes at least one second stator fixing member 201; the second mover fixing member 202 is connected to the second stator fixing member 201 through another shape memory alloy 15.

Specifically, the second driving assembly 200 includes a second mover fixing member 202 fixedly disposed on the top of the second mover 3, and a set of second stator fixing members 101 respectively disposed on opposite sides of the second mover fixing member 202; preferably, the set of second stator fixing parts 101 includes two second stator fixing parts 201, that is, the total number of the second stator fixing parts 201 is four, and the two second stator fixing parts are respectively fixedly connected to four corners of the top of the first mover 2; the second mover fixing member 202 is in an i-shaped structure and is fixedly connected to the top of the second mover 3, and a shape memory alloy 15 is connected between the second mover fixing member 202 and each of the second stator fixing members 201. Preferably, the top surface of the second mover 3 is opened with an installation groove 31 at a middle position, and the second mover fixing member 202 can be fittingly and fixedly installed in the installation groove 31.

The second driving assembly 200 drives the second mover 3 to move in the following specific process: when the two shape memory alloys 15 positioned in the X + direction are electrified and heated, the length of the two shape memory alloys 15 is shortened, and simultaneously, the length of the two shape memory alloys 15 positioned in the X-direction is lengthened after the two shape memory alloys 15 are powered off and cooled, so that the second rotor fixing part 202 moves towards the X + direction, and the second rotor 3 is driven to move in the same direction; when the two shape memory alloys 15 positioned in the X-direction are electrified and heated, the length of the two shape memory alloys 15 is shortened, and simultaneously, the length of the two shape memory alloys 15 positioned in the X + direction is lengthened after the two shape memory alloys 15 are powered off and cooled, so that the second rotor fixing part 202 moves towards the X-direction and further drives the second rotor 3 to move in the same direction;

it should be noted that, the shape memory alloy 15, the stator fixing member and the mover fixing member may be pre-assembled and connected, so as to facilitate the assembly process, and reduce the problem of the increase of the product reject ratio caused by damage during the field assembly.

Further, the group of first stator fixing members 101 includes two first stator fixing members 101 respectively connected to two ends of the first mover fixing member 102, and the two first stator fixing members 101 are arranged in a manner of intersecting with the two shape memory alloys 15 connected to each end of the first mover fixing member 102;

the set of second stator fixing parts 201 includes two second stator fixing parts 201 respectively connected to two ends of the second mover fixing part 202, and the two second stator fixing parts 201 are arranged in a crossing manner with the two shape memory alloys 15 connected to each end of the second mover fixing part 202.

In the present embodiment, the second driving assembly 200 is taken as an example to specifically describe the connection manner of the shape memory alloy 15, and since the connection manner of the shape memory alloy 15 of the first driving assembly 100 is the same as that of the second driving assembly 200, the description thereof is omitted; specifically, referring to fig. 1, the set of second stator fixing members 201 includes two second stator fixing members 201 located in the X + direction or two second stator fixing members 201 located in the X-direction; the two second stator fixing pieces 201 are arranged in a crossed manner with the two shape memory alloys 15 connected with each end of the second mover fixing piece 202, namely, one of the second stator fixing pieces 201 in the X + direction is connected with one end of the second mover fixing piece 202 through the shape memory alloy A, the other one of the second stator fixing pieces 201 in the X + direction is connected with the other end of the second mover fixing piece 202 through the shape memory alloy B, and the shape memory alloy A and the shape memory alloy B are arranged in an X-shaped crossed manner; it should be noted that the manner of connecting the two ends of the two second stator fixing members 201 and the two ends of the second mover fixing member 202 in the X-direction is the same as the above structure, and details are not described here. By the shape memory alloy 15 arranged crosswise, the moving stroke of the shape memory alloy 15 caused by deformation under the influence of temperature is further increased.

Further, the first mover 2 is provided with conductive elastic members 4 at opposite sides in the first direction; the conductive elastic member 4 is electrically connected to the shape memory alloy 15 of the second driving assembly 200, and the conductive elastic member 4 is used for energizing and de-energizing the shape memory alloy 15 of the second driving assembly 200.

Specifically, the conductive elastic member 4 is electrically connected to the shape memory alloy 15 of the second driving assembly 200, and is used for electrically connecting the shape memory alloy 15 with each electronic component, so that the shape memory alloy 15 is heated when being powered on and cooled when being powered off; compared with the conventional connection mode through a flexible circuit board, the connection mode between the conductive elastic piece 4 and each electronic element is simple, the cost is lower, and the method is more suitable for batch production.

Further, a conductive member 5 is disposed on the fixing base 1, the conductive member 5 is electrically connected to the shape memory alloy 15 of the first driving assembly 100, and the conductive member 5 is used for powering on and off the shape memory alloy 15 of the first driving assembly 100.

Specifically, the conductive member 5 is electrically connected to the shape memory alloy 15 of the first driving assembly 100 to form a power-on loop, and the power can be supplied to the shape memory alloy 15 to heat the shape memory alloy 15, or the power can be cut off to cool the shape memory alloy 15.

It should be noted that the shape memory alloy 15 in this embodiment is a material having a heat-shrinkable and cold-expandable property; when the shape memory alloy 15 is powered on, the shape memory alloy 15 gradually shortens along with the gradual rise of the temperature of the shape memory alloy 15 so as to drive the first mover fixing part 102 and the second mover fixing part 202 to move in the shortening direction; when the power is cut off to the shape memory alloy 15, the shape memory alloy 15 is gradually extended as the temperature of the shape memory alloy 15 is gradually lowered to drive the first mover fixing 102 and the second mover fixing 202 to move in the extended direction.

Illustratively, when the shape memory alloy 15 at the X + direction is energized, the X + direction is the direction in which the shape memory alloy 15 shortens; meanwhile, when the shape memory alloy 15 at the X-direction is powered off, the X + direction is the extending direction, so as to drive the first rotor fixing part 102 and the second rotor fixing part 202 to move towards the X + direction;

illustratively, when the shape memory alloy 15 in the X + direction is powered off, the X-direction is the direction in which the shape memory alloy 15 elongates; meanwhile, when the shape memory alloy 15 in the X-direction is powered on, the X-direction is a direction in which the shape memory alloy 15 shortens, so as to drive the first mover fixing member 102 and the second mover fixing member 202 to move in the X-direction.

Furthermore, four corners of the fixed base 1 extend upward to form a fixed column 11, the first driving assembly 100 further includes a set of sliding guide shafts 12, and the set of sliding guide shafts 12 at least includes one sliding guide shaft 12; two ends of the sliding guide shaft 12 are respectively fixedly connected with a fixed column 11, and the second rotor 3 is slidably sleeved on the sliding guide shaft 12; and the central axis of the slide guide shaft 12 is parallel to the first direction.

Specifically, the top of the fixed base 1 is provided with four fixed columns 11, wherein a group of sliding guide shafts 12 is fixedly connected between the two fixed columns 11 parallel to the first direction, that is, the central axis of the sliding guide shaft 12 is parallel to the first direction; the set of slide guide shafts 12 may include one having a square cross section so that the second mover 3 is stably slidably coupled to the slide guide shaft.

As a preferred embodiment, the set of sliding guide shafts 12 includes two sliding guide shafts, and two ends of each sliding guide shaft are fixedly connected to a fixing post 11, i.e. the two sliding guide shafts are disposed on two opposite sides of the second mover 3 parallel to the first direction, and the second mover 3 is slidably connected to the two sliding guide shafts 12, so as to ensure stability and smoothness of the sliding process of the second mover 3.

Further, through holes 14 for penetrating the sliding guide shafts 12 are respectively formed in two opposite sides of the first mover 2; the first mover 2 and the second mover 3 are slidably coupled to the same set of slide guide shafts 12, thereby improving the moving accuracy of the multi-stage driving.

Further, both ends of the through hole 14 are provided with storage grooves 13 for storing grease.

Specifically, the sliding guide shaft 12 is inserted into through holes 14 formed in two opposite sides of the first mover 2, preferably, through holes 14 for inserting the sliding guide rails 12 are also formed in two opposite sides of the second mover 3, and storage grooves 13 for storing grease are formed in two ends of each through hole 14; when the second mover 3 and the first mover 2 slide on the slide guide 12, grease (lubricant) in the storage tank 13 is uniformly applied to the slide guide 12, thereby ensuring the smoothness of the sliding of the second mover 3 and the first mover 2 on the slide guide 12.

Furthermore, a magnetic member 6 is disposed on the edge of the storage tank 13, and another magnetic member 6 is disposed on each fixing column 11 corresponding to one magnetic member 6.

Specifically, referring to fig. 3 to 5, the magnetic members 6 are disposed on the edge of the storage slot 13, that is, two opposite sides of the first mover 2 and the second mover 3 are respectively disposed with one magnetic member 6, and another magnetic member 6 is disposed on each fixing column 11 corresponding to one magnetic member 6. When the driving device of this embodiment is in a non-operating state, if vibration or shaking occurs, the magnetic members 6 on the first mover 2, the second mover 3 and the fixed column 11 can be attracted one by magnetic force, so that the second mover 3 and the first mover 2 are attracted to the fixed column 11, and therefore, position deviation does not occur and collision with other parts in the electronic device is avoided, and the problem that the parts are damaged to affect use is avoided.

The present embodiment implements two-stage driving of the second mover 3 by providing the first driving assembly 100 and the second driving assembly 200. Further, the side surfaces of two opposite sides of the second mover 3 in the first direction are respectively connected with a driving assembly, that is, the third driving assembly is disposed on the left side surface of the second mover 3, and the fourth driving assembly is disposed on the right side surface of the second mover 3. The multi-stage driving of the second rotor 3 is realized through the third driving assembly and the fourth driving assembly, so that the second rotor 3 can reach a larger movement stroke, and a better macro shooting effect can be achieved.

It should be noted that the structures of the third driving assembly and the fourth driving assembly are the same as the second driving assembly 200, and the processes and technical effects of the third driving assembly and the fourth driving assembly for driving the second mover 3 to move are the same as the second driving assembly 200, and are not described herein again.

As a preferred embodiment, the driving device of this embodiment may add multiple driving assemblies according to actual use requirements to achieve the effect of multiple driving, thereby achieving a longer movement stroke. The present embodiment provides only one specific embodiment as a reference, for example, a fifth driving assembly may be connected to the bottom of the second mover 3; each side surface of the first mover 2 may also be connected with a driving assembly, specifically, the sixth driving assembly is disposed on the left side surface of the first mover 2, the seventh driving assembly is disposed on the right side surface of the first mover 2, and the eighth driving assembly is disposed on the top of the first mover 2. The above driving assembly is identical to the first driving assembly 100 and the second driving assembly 200, and is not described herein again.

The fixing connection mode in the present embodiment may be laser welding and/or glue bonding, for example, to ensure the stability of the connection and the safety in use.

Example two

Referring to fig. 6, a camera module includes a housing 7, a containing cavity is disposed inside the housing 7, and a micro driving device as in any one of the embodiments is disposed in the containing cavity; in the first embodiment, regarding the specific structure and technical effects of the micro driving device, the camera module of the first embodiment also has the technical effects by using the device;

the focusing mechanism further comprises a lens 8 arranged on the second rotor 3, and the driving device is used for driving the lens 8 to adjust the focusing distance.

Specifically, the driving device drives the second mover 3 to move through the first driving assembly 100 and the second driving assembly 200, and the lens 8 is mounted on the second mover 3 and can be driven by the second mover to perform focusing processing, so that the lens 8 can be suitable for long-focus shooting and macro-shooting and has a better shooting effect.

Further, the outer surfaces of the housing 7 and the fixed base 1 are coated with a dust coating.

Specifically, the dust-binding coating is used for adsorbing micro-dust generated in the device, so that the micro-dust is prevented from entering and influencing the shooting of the camera module; still be used for playing the cushioning effect to the collision between each spare part, guarantee the result of use of the module of making a video recording. Illustratively, the dust-binding coating may be a dust-binding glue or an electrostatic adsorption coating.

EXAMPLE III

One or more of a reflecting prism and/or a reflecting lens and/or a sensor (an image sensor, an infrared sensor, etc.) are fixedly mounted on the second mover 2 in the embodiment, so that the purpose of driving the reflecting prism and/or the reflecting lens and/or the sensor to move through a driving device is achieved.

Other structures of this embodiment are the same as those of the second embodiment, and therefore have the same technical effects as those of the second embodiment, and are not described herein again.

It should be noted that the above embodiments are only preferred embodiments of the present invention and the technical principles applied, and not limiting. For those skilled in the art, according to the idea of the embodiments of the present invention, various obvious changes, rearrangements and substitutions can be made to the technical solutions described in the foregoing embodiments without departing from the scope of the present invention. Accordingly, the subject matter of this specification should not be construed as limiting the invention.

Claims

1. The miniature driving device is characterized by comprising a fixed base (1) and a first rotor (2) which is in sliding connection with the fixed base (1), wherein the first rotor (2) is connected with a first driving assembly (100), and the first driving assembly (100) is used for driving the first rotor (2) to move along a first direction;

the first rotor (2) is connected with a second rotor (3) in a sliding mode, the top of the second rotor (3) is connected with a second driving assembly (200), and the second driving assembly (200) is used for driving the second rotor (3) to move along the first direction; the first direction is a central axis direction of the second mover (3).

2. The micro-driving device according to claim 1, wherein the first driving assembly (100) comprises a first mover fixing member (102) disposed between the fixed base (1) and the first mover (2), the first mover fixing member (102) is respectively provided with a set of first stator fixing members (101) at two opposite sides in the first direction, each set of first stator fixing members (101) comprises at least one first stator fixing member (101);

the first rotor fixing piece (102) is connected with the first stator fixing piece (101) through a shape memory alloy (15); the shape memory alloy (15) is an alloy that is correspondingly stretchable/contractible according to temperature and/or applied external force, and the alloy is configured to have a shape memory effect caused by temperature.

3. The micro actuator according to claim 2, wherein the second actuator assembly (200) comprises a second mover holder (202) disposed on top of the second mover (3), the second mover holder (202) being provided with a set of second stator holders (201) on opposite sides in the first direction, each set of second stator holders (201) comprising at least one second stator holder (201);

the second rotor fixing part (202) is connected with the second stator fixing part (201) through another shape memory alloy (15).

4. A micro-actuator according to claim 3, wherein a set of the first stator fixing member (101) comprises two first stator fixing members (101) respectively connected to two ends of the first rotor fixing member (102), and two shape memory alloys (15) connected to each end of the first rotor fixing member (102) are arranged in a crossing manner;

the group of second stator fixing parts (201) comprises two second stator fixing parts (201) which are respectively connected with two ends of the second rotor fixing part (202), and the two shape memory alloys (15) connected with each end of the second rotor fixing part (202) are arranged in a crossed mode.

5. A micro-actuator according to claim 3, wherein the first mover (2) is provided with conductive elastic members (4) at opposite sides in the first direction, respectively; the conductive elastic part (4) is electrically connected with the shape memory alloy (15) of the second driving assembly (200), and the conductive elastic part (4) is used for electrifying and deenergizing the shape memory alloy (15) of the second driving assembly (200).

6. A microactuator as in claim 5, wherein the stationary base (1) is provided with an electrically conductive member (5), the electrically conductive member (5) being electrically connected to the shape memory alloy (15) of the first drive assembly (100), the electrically conductive member (5) being used to energize and de-energize the shape memory alloy (15) of the first drive assembly (100).

7. The micro-driving device according to claim 1, wherein four corners of the fixing base (1) are respectively extended upward to form a fixing column (11), the first driving assembly (100) further comprises a set of sliding guide shafts (12), and the set of sliding guide shafts (12) comprises at least one sliding guide shaft (12); two ends of the sliding guide shaft (12) are respectively and fixedly connected with the fixed column (11), and the second rotor (3) is slidably sleeved on the sliding guide shaft (12);

the central axis of the sliding guide shaft (12) is parallel to the first direction.

8. The micro-driving device according to claim 7, wherein opposite sides of the first rotor (2) are respectively provided with a through hole (14) for penetrating the sliding guide shaft (12); the first rotor (2) and the second rotor (3) are connected to the same group of sliding guide rails (12) in a sliding mode.

9. A micro-actuator according to claim 8, wherein both ends of the through-hole (14) are provided with reservoirs (13) for storing grease.

10. The micro-driving device as claimed in claim 9, wherein a magnetic member (6) is disposed on the edge of the storage slot (13), and another magnetic member (6) is disposed on each of the fixing posts (11) at a position corresponding to the magnetic member (6).

11. The micro driving device according to claim 1, wherein a third driving assembly is connected to one side of the second mover (3), and a fourth driving assembly is connected to the other side of the second mover (3), and the third driving assembly and the fourth driving assembly are used for driving the second mover (3) to move along the first direction in multiple stages.

12. A camera module, comprising a housing (7), wherein the housing (7) is provided with a receiving cavity therein, and the receiving cavity is provided with a micro driving device according to any one of claims 1 to 11;

the miniature driving device is used for driving the lens (8) to adjust the focusing distance of the miniature driving device.

13. The camera module according to claim 12, wherein the outer surfaces of the housing (7) and the fixing base (1) are coated with a dust-sticking coating.