CN108693620B

CN108693620B - Optical assembly driving mechanism

Info

Publication number: CN108693620B
Application number: CN201810185975.4A
Authority: CN
Inventors: 黄健伦; 林育丞; 许乃文
Original assignee: TDK Taiwan Corp
Current assignee: TDK Taiwan Corp
Priority date: 2017-03-29
Filing date: 2018-03-07
Publication date: 2021-10-22
Anticipated expiration: 2038-03-07
Also published as: CN108693621A; CN207882549U; CN208297803U; CN108693621B; CN108693620A; CN108693619A; CN207882548U; CN108693619B

Abstract

A driving mechanism is used for driving an optical component. The driving mechanism comprises a base unit, a bearing unit, an elastic component, a driving component and a sensing component. The bearing unit bears the optical component. The elastic component is connected with the bearing unit and the base unit. The driving assembly drives the optical assembly to displace relative to the base unit. The sensing component is arranged between the bearing unit and the base unit and used for sensing the position of the bearing unit relative to the base unit, wherein the elastic component and the sensing component are at least partially overlapped when being observed from the direction of the optical axis of the optical component.

Description

Optical assembly driving mechanism

Technical Field

The present invention relates to an optical assembly driving mechanism, and more particularly, to an optical assembly driving mechanism in which an elastic member and a sensing member at least partially overlap each other when viewed from an optical axis direction.

Background

Electronic products have increasingly stringent requirements for volume, and the internal space needs to be utilized more efficiently if the volume is reduced. In addition, after the electronic product is collided, the internal electronic components are often damaged by collision of other parts, so that the electronic product loses the original performance.

Disclosure of Invention

It is an object of the present invention to provide an optical drive mechanism that solves at least one of the problems set forth above.

In order to solve the above problems, an embodiment of the present invention provides a driving mechanism for driving an optical device, the driving mechanism including a supporting unit, a base unit, an elastic device, a driving device, and a sensing device. The bearing unit is used for bearing the optical component. The base unit is positioned below the bearing unit. The elastic component is connected with the bearing unit and the base unit. The driving component is used for driving the optical component to move relative to the base unit. The sensing component is arranged between the bearing unit and the base unit and used for sensing the position of the bearing unit relative to the base unit, wherein the elastic component and the sensing component are at least partially overlapped when being observed from the direction of the optical axis of the optical component.

In one embodiment, the sensing assembly further includes a magnetic field sensing assembly disposed on the base unit and a sensing magnet disposed on the carrying unit.

In one embodiment, the sensing magnet is a multi-pole magnet.

In an embodiment, the driving mechanism further includes an outer frame, the outer frame is made of magnetic conductive material and has an opening and an extension portion, wherein the supporting unit is disposed in the opening, and the extension portion extends from an inner edge of the opening toward the base unit.

In an embodiment, the outer frame has a quadrilateral structure, and the positions of the extension portion and the sensing assembly are located at different corners of the quadrilateral structure.

In an embodiment, the outer frame further has two extending portions, and the extending portions are respectively located at two opposite corners of the quadrilateral structure. An embodiment of the present invention provides a driving mechanism for driving an optical device, the driving mechanism including a frame, a carrying unit, a driving device and a circuit unit. The frame is provided with a stop part protruding out of the inner side surface of the frame, wherein the stop part is separated from the optical axis of the optical assembly by a first distance. The bearing unit is movably arranged in the frame and is used for bearing the optical component. The driving component is used for driving the optical component to move relative to the frame. The circuit unit is arranged on the frame, wherein a second distance is arranged between the circuit unit and the optical axis of the optical component, and the first distance is smaller than the second distance.

In one embodiment, the circuit unit includes a circuit board and an integrated circuit device disposed on the circuit board, wherein the integrated circuit device abuts against the abutting surface of the stopper.

In one embodiment, the abutting surface is perpendicular to the optical axis direction. In one embodiment, the stop has a structure of a reversed U shape.

In one embodiment, the circuit unit includes a circuit board and an integrated circuit device, the integrated circuit device is disposed on the circuit board, and the frame further has two position-limiting portions, wherein the circuit board is disposed between the position-limiting portions and is used to limit the circuit board to a predetermined position.

In one embodiment, the circuit unit includes a circuit board and an integrated circuit device disposed on the circuit board, wherein the stop portion and the limiting portion form a groove, and the circuit board is disposed in the groove. In an embodiment, the driving mechanism further includes a wire, and the carrying unit has a winding post, the wire is electrically connected to the driving element and wound on the winding post, wherein the winding post and the driving element correspond to different sides of the carrying unit.

The optical component driving mechanism has the advantages that the elastic component and the sensing component are at least partially overlapped, so that the internal space can be more effectively utilized to reduce the volume of the driving mechanism.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 shows a perspective view of a driving mechanism according to an embodiment of the present invention.

Fig. 2 shows an exploded view of the drive mechanism of fig. 1.

Fig. 3A shows a cross-sectional view taken along line a-a' in fig. 1.

Fig. 3B shows a cross-sectional view taken along line B-B' in fig. 1.

FIG. 4 shows a top view of a drive mechanism according to an embodiment of the invention.

Fig. 5 is a schematic diagram illustrating a relative position relationship between the magnetic field sensing assembly and the sensing magnet after being combined according to an embodiment of the invention.

FIG. 6A is a partial top view of the combined relative positions of the driving coil, the upper spring, the lower spring, the magnetic field sensing assembly and the sensing magnet according to one embodiment of the invention.

FIG. 6B is a side view showing the relative position of the drive coil, the upper spring, the lower spring, the magnetic field sensing assembly and the sensing magnet shown in FIG. 6A after they are combined.

Fig. 7 is a perspective view showing a relative position relationship of the outer frame, the base unit and the sensing magnet after being combined according to an embodiment of the invention.

Fig. 8A shows a side view of a frame and a circuit unit according to an embodiment of the invention.

Fig. 8B is a top view of the frame and the circuit unit shown in fig. 8A.

Fig. 8C is a partial cross-sectional view of the frame, the circuit unit and the outer frame shown in fig. 8B after being combined.

The reference numbers are as follows:

1-a driving mechanism;

10-outer frame;

10A-the top wall of the outer frame;

10B-side wall of the outer frame;

11-an extension part;

12-opening a hole on the outer frame;

20-a base unit;

201 to a body;

202-connecting pieces;

22-opening a hole on the base;

30-a carrying unit;

31-wire

311 portions of winding posts;

32-through holes;

40 driving coils;

50-frame;

502-a stopper;

502A-an abutting surface;

502B-chamfering;

504-a limiting part;

50A-groove;

50B-inner side surface;

52-opening;

60-magnetic components;

70-reed loading;

72-lower reed;

80-a circuit board;

82-a magnetic field sensing assembly;

84-integrated circuit components;

86-capacitor;

90. 90' to a sensing magnet;

901. 903 to a sector;

902-magnetic neutral region;

910. 910' to a glue tank;

CU to circuit unit;

d1-a first distance;

d2-a second distance;

EM-driving component;

o-optical axis;

w1-first width;

w2-second width;

WR-groove width.

Detailed Description

The driving mechanism of the embodiment of the present invention is explained below. It should be appreciated, however, that the present embodiments provide many suitable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments disclosed are merely illustrative of specific ways to make and use the invention, and do not delimit the scope of the invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Referring to fig. 1 to fig. 3B, in which fig. 1 shows a perspective view of a driving mechanism 1 according to an embodiment of the present invention, fig. 2 shows an exploded view of the driving mechanism 1 in fig. 1, and fig. 3A and fig. 3B show cross-sectional views along a line a-a 'and a line B-B' in fig. 1, respectively. It should be noted that, in the present embodiment, the driving mechanism 1 is, for example, a Voice Coil Motor (VCM), which can be disposed in an electronic device with a camera function to drive an optical lens and has an Auto-Focusing (AF) function.

As can be seen from fig. 2, the driving mechanism 1 has a substantially quadrilateral structure, and mainly includes an outer frame 10, a base unit 20, a carrying unit 30, a plurality of driving coils 40, a frame 50, a plurality of magnetic elements 60, an upper spring 70, a lower spring 72, a circuit board 80, and at least one sensing magnet 90. It should be noted that the term "spring element" as described herein below may include upper spring 70 and/or lower spring 72.

The housing 10 has a hollow structure having a top wall 10A, four side walls 10B, and an opening 12, wherein the center of the opening 12 corresponds to an optical axis O of an optical element OE (see fig. 3A and 3B). The base unit 20 has an opening 22, and the opening 22 corresponds to an image sensing device (not shown) disposed outside the driving mechanism 1. The housing 10 and the base unit 20 are connected to each other, so that an optical element OE (e.g. an optical lens) disposed in the driving mechanism 1 can focus on the image sensing element in the direction of the optical axis O.

The base unit 20 includes a body 201 and a connecting member 202. For example, the body 201 is made of plastic, and the connecting member 202 is made of metal. In the present embodiment, the connecting element 202 is electrically connected to a circuit unit (not shown) disposed outside the driving mechanism 1 through the circuit board 80 (see fig. 3B) for performing functions such as Auto Focus (AF). The plastic body 201 is covered outside the connector 202 by insert molding (insert molding).

The carrying unit 30 carries an optical component OE. The carrying unit 30 has a hollow structure and is formed with a through hole 32, wherein the optical element OE (see fig. 3A and 3B) is locked in the through hole 32. The frame 50 has an opening 52 and a recess 50A, wherein the circuit board 80 can be fixed in the recess 50A. In the present embodiment, the circuit board 80 is electrically connected to a driving unit (not shown) disposed outside the driving mechanism 1, the circuit board 80 is electrically connected to the driving coil 40 through the connecting member 202, and the electric signal generated by the driving unit is transmitted to the driving coil 40 to perform an Auto Focus (AF) function.

Fig. 3A shows a cross-sectional view taken along line a-a' in fig. 1. As shown in fig. 2 and 3A, the carrying unit 30 is movably (movably) connected to the outer frame 10 and the base unit 20. More specifically, the carrier unit 30 is connected to the frame 50 and the base unit 20 by upper and lower metal springs 70 and 72, respectively, so that the carrier unit 30 is movably suspended between the frame 50 and the base unit 20.

The two magnetic assemblies 60 and the two corresponding driving coils 40 located outside the carrying unit 30 may constitute a driving assembly EM. When a current is applied to the driving coil 40 through the connecting member 202 and the circuit board 80 (see fig. 3B), an electromagnetic driving force (electromagnetic driving force) can be generated by the driving coil 40 and the magnetic assembly 60 to drive the carrier unit 30 and the optical assembly OE to move along the Z-axis direction (optical axis O direction) relative to the base unit 20, so as to perform an auto-focusing (AF) function.

Fig. 3B shows a cross-sectional view taken along line B-B' in fig. 1. As shown in fig. 3B, the circuit board 80 can transmit an electrical signal to two driving coils 40 (see fig. 3A) located outside the carrier unit 30 through the connecting member 202, the lower spring 72 and a lead 31, thereby controlling the movement of the carrier unit 30 in the Z-axis direction.

In addition, a magnetic field sensing element 82, such as a Hall sensor (Hall effect sensor), a magneto-resistive (MR) sensor, such as a Giant Magnetoresistive (GMR) sensor or a Tunneling Magnetoresistive (TMR) sensor, or a flux sensor (Fluxgate), may be disposed above the base unit 20 and electrically connected to the circuit board 80, the magnetic field sensing element 82 and the sensing magnet 90 form a sensing element, and a position offset of the carrying unit 30 relative to the base unit 20 in the Z-axis direction (optical axis O direction) can be known by sensing the sensing magnet 90 disposed on the carrying unit 30, wherein the circuit board 80 and the driving element EM are disposed on different sides of the driving mechanism 1, so as to avoid electromagnetic interference and fully utilize the space inside the driving mechanism 1.

Referring to fig. 4, fig. 4 is a top view of the driving mechanism 1 according to an embodiment of the present invention, wherein the outer frame 10, the frame 50 and the upper spring 70 are not shown in the figure for clearly showing the internal structure of the driving mechanism 1. As shown in fig. 4, the driving assemblies EM (including the magnetic assembly 60 and the driving coil 40) are located on two opposite sides of the carrying unit 30 (e.g., left and right sides of the carrying unit 30 in fig. 4), and the driving assemblies EM are not located on the other two sides of the carrying unit 30 (e.g., upper and lower sides of the carrying unit 30 in fig. 4), so that the side of the driving mechanism 1 where the driving assemblies EM are not located can be retracted inward, thereby achieving the effect of miniaturization.

In addition, the carrying unit 30 has a winding post 311 for winding the wire 31 electrically connected to the driving coil 40 (driving element EM) on the winding post 311. It should be noted that the winding post 311 and the driving element EM are disposed on different sides of the carrying unit 30, for example, the winding post 311 is disposed on the upper and lower sides of the carrying unit 30 in fig. 4 to avoid the driving element EM, so as to further save the space required inside the driving mechanism 1.

Referring to fig. 4, in the present embodiment, besides the magnetic field sensing element 82, an Integrated Circuit (IC) element 84 and a capacitor 86 are disposed on the circuit board 80, wherein the circuit board 80, the IC element 84 and the capacitor 86 may form a circuit unit CU for performing an Auto Focus (AF) function. The sensing magnet 90 is disposed in the corresponding glue groove 910 of the carrying unit 30, and the sensing magnet 90 can be fixed in the glue groove 910 by an adhesive. It should be noted that, in addition to the sensing magnet 90 corresponding to the magnetic field sensing assembly 82, another sensing magnet 90 ' is disposed at the opposite position of the sensing magnet 90 on the carrying unit 30, and the sensing magnet 90 ' is disposed in the corresponding glue groove 910 ', so that the driving mechanism 1 can achieve the balance in weight.

Referring to fig. 5, fig. 5 is a schematic diagram illustrating a relative position relationship between the magnetic field sensing assembly 82 and the sensing magnet 90 after being combined according to an embodiment of the invention. In the embodiment, no other component is disposed between the magnetic field sensing component 82 and the sensing magnet 90, so that the magnetic field sensing component 82 can sense the displacement of the sensing magnet 90 on the carrying unit 30 along the Z-axis direction (the optical axis O direction) without interference, thereby improving the sensing accuracy. The sensing magnet 90 is a multi-pole magnet including at least two sectors (magnetic domains) 901, 903, the

sectors

901, 903 having N and S poles, respectively. In addition, the sensing magnet 90 has a magnetic neutral region 902 located between the

sectors

901, 903.

As shown in fig. 5, the S-pole of the sector 901 faces the magnetic field sensing element 82, the N-pole faces the through hole 32 (see fig. 4) of the carrying unit 30, the N-pole of the other sector 903 faces the magnetic field sensing element 82, and the S-pole faces the through hole 32 of the carrying unit 30. It should be noted that in other embodiments, the magnetic pole directions of the

sectors

901, 903 may be opposite to the magnetic pole directions described above. By designing the sensing magnet 90 as a multi-pole magnet with a plurality of sectors, the magnetic force lines of the sensing magnet 90 are more compact, and the sensing accuracy can be further improved without increasing the volume of the sensing magnet 90. This also reduces the size of the sensing magnet 90, thereby reducing the power consumption of the driving mechanism 1 and achieving the effect of miniaturization.

Referring to fig. 6A and 6B, fig. 6A is a partial top view illustrating a relative position relationship after the driving coil 40, the upper spring 70, the lower spring 72, the magnetic field sensing assembly 82 and the sensing magnet 90 are combined according to an embodiment of the invention, and fig. 6B is a side view illustrating a relative position relationship after the driving coil 40, the upper spring 70, the lower spring 72, the magnetic field sensing assembly 82 and the sensing magnet 90 are combined, as shown in fig. 6A. As shown in fig. 6A-6B, the magnetic field sensing element 82 and the sensing magnet 90 (sensing element) are disposed between the upper spring 70 and the lower spring 72, and the sensing element and the upper spring 70 and the lower spring 72 (elastic element) at least partially overlap, when viewed along the optical axis O direction (Z-axis direction). In the present embodiment, the magnetic field sensing element 82 and the sensing magnet 90 do not extend beyond the edges of the upper spring 70 and the lower spring 72 in the horizontal direction (XY plane). This saves the space required for the drive mechanism 1 in the horizontal direction (XY plane) to achieve miniaturization of the drive mechanism.

Referring to fig. 7, fig. 7 is a perspective view showing a relative position relationship of the outer frame 10, the base unit 20 and the sensing magnet 90 after being combined according to an embodiment of the invention. In the embodiment, the outer frame 10 is made of a magnetic conductive material with a quadrilateral structure, wherein the supporting unit 30 is disposed in the opening 12 of the outer frame 10, and the outer frame 10 has two extending portions 11 extending from the inner edge of the opening 10A toward the direction of the base unit 20 (the (-Z-axis direction). In addition, the two extending portions 11 of the housing 10 are located at two opposite corners of the quadrilateral structure, and the extending portions 11 and the sensing magnet 90 and the corresponding magnetic field sensing element 82 (i.e., sensing element) (see fig. 6A-6B) are located at different corners of the quadrilateral structure. By disposing the extension 11 and the sensing magnet 90 at different corners of the outer frame 10, the sensing magnet 90 is prevented from being influenced by the outer frame 10 and the extension 11, thereby preventing the driving mechanism from being influenced and achieving the balance of the driving mechanism in terms of weight.

Referring to fig. 8A to 8C, fig. 8A is a side view of a frame 50 and a circuit unit CU according to an embodiment of the invention, fig. 8B is a top view of the frame 50 and the circuit unit CU shown in fig. 8A, and fig. 8C is a partial cross-sectional schematic view of the frame 50, the circuit unit CU and the outer frame 10 shown in fig. 8B after being combined. In the present embodiment, the circuit unit CU is disposed on the frame 50, the frame 50 has a stop portion 502 and two position-limiting portions 504, wherein the stop portion 502 protrudes from an inner surface 50B (see fig. 8B) of the frame 50 for protecting electronic components of the circuit unit CU (i.e., the electronic components disposed on the circuit board 80), and the circuit board 80 is disposed between the two position-limiting portions 504 for limiting the circuit board 80 to a predetermined position, i.e., fixing the position of the circuit unit CU on the frame 50.

In addition, the stopper 502 has a n-shaped structure (see fig. 8A) surrounding the ic 84 on the circuit board 80, wherein the stopper 502 has a first width W1 in the Y-axis direction (see fig. 8C), the ic 84 has a second width W2 in the Y-axis direction, and the first width W1 is greater than the second width W2. In other words, the stopper 502 has a first distance D1 from the optical axis O of the optical element OE, and the integrated circuit element 84 of the circuit unit CU has a second distance D2 from the optical axis O, wherein the first distance D1 is smaller than the second distance D2. The stopper 502 can protect the integrated circuit element 84 and other electronic elements (such as the magnetic field sensing element 82) disposed on the circuit board 80, so that the electronic elements are not damaged by direct impact with other parts inside the optical mechanism driving mechanism 1.

The stopper 502, the stopper 504 and the frame 10 (see fig. 8C) form a groove 50A. The groove 50A has a width WR between the stopper 502 and the inner side surface of the outer frame 10, wherein the width WR is generally between about 0.05mm and about 0.2mm, for example, about 0.1 mm. The circuit board 80 is disposed in the recess 50A to restrict the circuit board 80 in a horizontal direction (XY plane) in a predetermined position so that the circuit board 80 is not easily detached. In addition, the stop portion 502 and the position-limiting portion 504 of the frame 50 can also be used as a positioning target for assembling the circuit board 80 to the frame 50, thereby improving the accuracy of positioning the circuit board 80 during assembly and reducing the difficulty of assembly.

Referring to fig. 8C again, the stop portion 502 has an abutting surface 502A, the abutting surface 502A is perpendicular to the optical axis O direction (Z-axis direction), and the integrated circuit device 84 disposed on the circuit board 80 abuts against the abutting surface 502A of the stop portion 502 to prevent the circuit board 80 from contacting the frame 50 in the perpendicular direction (Z-axis direction), i.e., a gap is left between the circuit board 80 and the frame 50, so that when the driving mechanism 1 is impacted in the perpendicular direction, the circuit board 80 can be prevented from being damaged due to direct impact on the frame 50. In addition, a chamfer 502B may be provided on the inner side of the stopper 502 so that the circuit unit CU can be more easily mounted into the groove 50A.

In summary, the embodiments of the present invention provide an optical device driving mechanism in which the elastic device and the sensing device at least partially overlap when viewed from the optical axis direction, so that the internal space can be more effectively utilized to reduce the volume of the driving mechanism. In addition, the embodiment of the invention also provides an optical component driving mechanism with a frame capable of protecting the circuit board, so that the circuit board is not damaged by collision of other parts.

Although embodiments of the present invention and their advantages have been disclosed, it should be understood that various changes, substitutions and alterations can be made herein by those skilled in the art without departing from the spirit and scope of the invention. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification, but it is to be understood that any process, machine, manufacture, composition of matter, means, method and steps, presently existing or later to be developed, that will perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present application. Accordingly, the scope of the present application includes the processes, machines, manufacture, compositions of matter, means, methods, and steps described in the specification. In addition, each claim constitutes a separate embodiment, and the scope of protection of the present invention also includes combinations of the respective claims and embodiments.

Claims

1. A drive mechanism for driving an optical assembly, comprising:

a base unit;

a bearing unit bearing the optical component with an optical axis;

an outer frame having a quadrangular structure and fixedly connected to the base unit;

an elastic component, connecting the bearing unit and the base unit;

a driving component for driving the optical component to move relative to the base unit; and

a wire wound on a winding post of the bearing unit and electrically connected with the driving component;

the sensing assembly is arranged between the bearing unit and the base unit and used for sensing the position of the bearing unit relative to the base unit, the sensing assembly comprises a magnetic field sensing assembly arranged above the base unit and a sensing magnet arranged on the bearing unit, when the sensing assembly is observed along the direction of the optical axis, the sensing assembly is positioned at the corner of the quadrilateral structure, the sensing assembly and the winding post are positioned at the same side edge of the bearing unit, and when the sensing assembly is observed along the direction of the optical axis, the elastic assembly and the sensing assembly are at least partially overlapped.

2. The drive mechanism of claim 1, wherein the sensing assembly comprises:

a magnetic field sensing assembly arranged above the base unit; and

a sensing magnet disposed on the carrying unit.

3. The drive mechanism of claim 2, wherein the sensing magnet is a multi-pole magnet.

4. The driving mechanism as claimed in claim 1, wherein the frame is made of a magnetic conductive material, and has an opening and an extension portion, wherein the supporting unit is disposed in the opening, and the extension portion extends from an inner edge of the opening toward the base unit.

5. The driving mechanism as claimed in claim 4, wherein the positions of the extension and the sensing element are located at different corners of the quadrilateral structure.

6. The driving mechanism as claimed in claim 5, wherein the frame further has two extending portions, and the extending portions are respectively located at two opposite corners of the quadrilateral structure.

7. The drive mechanism of claim 1, further comprising:

a frame having a stop portion protruding from an inner surface of the frame, wherein the stop portion is spaced from the optical axis of the optical assembly by a first distance, and the carrying unit is movably disposed in the frame; and

and the circuit unit is arranged on the frame, wherein a second distance is formed between the circuit unit and the optical axis of the optical component, and the first distance is smaller than the second distance.

8. The driving mechanism as claimed in claim 7, wherein the circuit unit includes a circuit board and an integrated circuit device disposed on the circuit board, wherein the integrated circuit device abuts against an abutting surface of the stopper.

9. The driving mechanism as claimed in claim 8, wherein the abutting surface is perpendicular to the optical axis direction.

10. The driving mechanism as claimed in claim 7, wherein the stopper has a n-shaped structure.

11. The driving mechanism as claimed in claim 7, wherein the circuit unit includes a circuit board and an ic component, the ic component is disposed on the circuit board, the frame further has two position-limiting portions, and the circuit board is disposed between the position-limiting portions for limiting the circuit board to a predetermined position.

12. The driving mechanism according to claim 11, wherein the stopping portion and the plurality of position-limiting portions form a groove, and the circuit board is disposed in the groove.

13. The driving mechanism as claimed in claim 7, wherein the winding post and the driving element are disposed on different sides of the supporting unit.

14. A driving mechanism for driving an optical assembly, comprising:

a frame having a stopper protruding from an inner surface of the frame, wherein the stopper is spaced from an optical axis of the optical assembly by a first distance;

a bearing unit movably arranged in the frame and bearing the optical component;

a driving component for driving the optical component to move relative to the frame; and

the circuit unit is arranged on the frame and comprises a circuit board and an integrated circuit assembly, the integrated circuit assembly is arranged on the circuit board and is abutted against an abutting surface of the stopping part, a second distance is reserved between the circuit unit and the optical axis of the optical assembly, the first distance is smaller than the second distance, when the circuit unit is observed along the direction of the optical axis, the circuit unit is partially overlapped with the frame, and a gap is reserved between the circuit board and the frame in the direction of the optical axis.

15. The driving mechanism as claimed in claim 14, wherein the abutting surface is perpendicular to the optical axis direction.

16. The driving mechanism as claimed in claim 14, wherein the stopper has a n-shaped structure.

17. The driving mechanism as claimed in claim 14, wherein the frame further has two position-limiting portions, and the circuit board is disposed between the position-limiting portions for limiting the circuit board at a predetermined position.

18. The driving mechanism according to claim 17, wherein the stopping portion and the plurality of position-limiting portions form a groove, and the circuit board is disposed in the groove.

19. The driving mechanism as claimed in claim 14, further comprising a wire, and the supporting unit has a winding post, the wire is electrically connected to the driving element and wound around the winding post, wherein the winding post and the driving element are disposed on different sides of the supporting unit.