Drive mechanism

Abstract

A driving mechanism is used for driving an optical element to move and mainly comprises a fixed part, a movable part and a driving assembly. The movable part is movably connected with the fixed part, the optical element is arranged on the movable part, and the driving assembly is used for driving the movable part to move relative to the fixed part.

Description

Technical Field

[0001] The utility model relates to a driving mechanism, and more specifically, to a driving mechanism capable of driving an optical element to move. Background Art

[0002] With the development of technology, many electronic devices (such as smart phones or digital cameras) now have the function of taking photos or recording videos. These electronic devices are becoming more and more popular and are developing in the direction of convenient and thinner designs to provide users with more choices.

[0003] Some electronic devices with camera or video recording functions are equipped with a lens drive module to drive an optical element to move, thereby achieving the functions of autofocus and optical image stabilization (OIS). Light can pass through the aforementioned optical element to form an image on a photosensitive element.

[0004] However, the lens driving module often needs to include a plurality of magnets and coils disposed around the optical element, which makes it impossible to further reduce the size of the lens driving module and the electronic device. Therefore, how to solve the above problem has become an important issue. Utility Model Content

[0005] The purpose of the present invention is to provide a driving mechanism to solve at least one of the above problems.

[0006] In view of the above-mentioned known problems, an embodiment of the present invention provides a driving mechanism for driving an optical element to move, wherein the optical element has an optical axis, and the driving mechanism includes a fixed portion, a movable portion, and a driving assembly. The movable portion is movably connected to the fixed portion, wherein the optical element is disposed on the movable portion, and the driving assembly is used to drive the movable portion to move relative to the fixed portion.

[0007] In one embodiment, the driving mechanism further includes an upper spring sheet, and the fixing portion has a plastic shell and a base connected to each other, wherein the shell is formed with a top cover, at least one side wall and at least one boss, the side wall extends from the top cover toward the base, and the boss protrudes from an inner surface of the top cover, wherein the upper spring sheet is fixed to the boss, and a groove is formed between the boss and the side wall.

[0008] In one embodiment, the shell is quadrilateral, and is further formed with two bosses and four positioning posts passing through the upper spring sheet, wherein the positioning posts are located on the bosses and define two diagonal lines, wherein the intersection of the diagonal lines deviates from the center point of the shell.

[0009] In one embodiment, the intersection of the diagonal lines is located on the optical axis.

[0010] In one embodiment, the driving component has a coil and a magnetic element, the coil is disposed on the movable portion, the magnetic element is fixed on the housing, and the upper spring is clamped between the magnetic element and the boss.

[0011] In one embodiment, the driving mechanism also includes a circuit board, and the base is formed with a first positioning column and a second positioning column, wherein the first and second positioning columns are respectively formed with a limiting structure, and the limiting structure abuts against the circuit board to position the circuit board at a preset position in the direction of the optical axis.

[0012] In one embodiment, the base further forms a first protrusion and a second protrusion, the circuit board is located between the first protrusion and the second protrusion in a first axial direction, and the circuit board abuts against the first protrusion, wherein the first axial direction is perpendicular to the optical axis.

[0013] In one embodiment, the driving mechanism further includes a magnet disposed on the movable part and a magnetic field sensing element disposed on the circuit board, for sensing a position change of the movable part relative to the fixed part, wherein the distance between the magnetic field sensing element and the first boss is greater than the distance between the magnetic field sensing element and the second boss.

[0014] In one embodiment, the thickness of the second positioning post in a second axial direction is greater than the thickness of the first positioning post in the second axial direction, wherein the second axial direction is perpendicular to the first axial direction and the optical axis.

[0015] In one embodiment, the driving mechanism further includes a magnet disposed on the movable part and a magnetic field sensing element disposed on the circuit board, for sensing a position change of the movable part relative to the fixed part, wherein the distance between the magnetic field sensing element and the second boss is greater than the distance between the magnetic field sensing element and the first boss.

[0016] In one embodiment, the driving mechanism further includes a conductive member and a glue, the base is formed with a first protrusion extending in the direction of the optical axis, and the conductive member is embedded in the first protrusion, wherein the first protrusion is formed with an opening, and the glue is filled in the opening to bond the conductive member and the first protrusion.

[0017] In one embodiment, the driving mechanism further includes a lower spring sheet connected to the base and the movable part, the shell further includes a plurality of positioning columns passing through the upper spring sheet, and the base includes a plurality of protrusions passing through the lower spring sheet, wherein the positioning columns and the protrusions do not overlap with each other in the direction of the optical axis.

[0018] In one embodiment, the driving mechanism also includes two wires, the driving component has two coils and two magnetic elements, the coils are arranged on the movable part, the magnetic elements are fixed on the shell, and the movable part has two winding poles, wherein the winding poles are located on the same side of the movable part, and the wires are electrically connected to the coils and are respectively wound around the winding poles.

[0019] In one embodiment, the driving mechanism further comprises two lower springs connected to the base and the movable portion, and each of the lower springs has an electrical connection portion, wherein the electrical connection portion is adjacent to the winding post and is electrically connected to the wires respectively.

[0020] In one embodiment, the electrical connection portions are respectively formed with a groove, and the opening directions of the grooves are opposite to each other.

[0021] In one embodiment, at least one of the lower spring sheets is formed with a through hole, and the movable portion is formed with a block passing through the lower spring sheet, wherein the through hole is located between the groove and the block.

[0022] In one embodiment, the driving mechanism further includes a circuit board, and the circuit board is fixed to the side wall.

[0023] In one embodiment, the driving mechanism further includes a conductive member, which is embedded in the base and electrically connected to the circuit board.

[0024] In one embodiment, the driving mechanism further includes a lower spring sheet, the lower spring sheet is connected to the base and the movable portion, and the conductive element is electrically connected to the lower spring sheet.

[0025] In one embodiment, the shell is further formed with two bosses, and the bosses are located at opposite sides of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 An exploded view of a driving mechanism according to an embodiment of the utility model is shown.

[0027] Figure 2 express Figure 1 Another exploded view of the drive mechanism.

[0028] Figure 3 express Figure 1 and Figure 2 A cross-sectional view of the drive mechanism after assembly.

[0029] Figure 4 express Figure 1 and Figure 2 Another cross-sectional view of the drive mechanism after assembly.

[0030] Figure 5 express Figure 1-Figure 4 A three-dimensional view of the shell in FIG.

[0031] Figure 6 A bottom view showing the upper spring and housing combined.

[0032] Figure 7 A three-dimensional diagram showing the circuit board, magnetic element, upper spring and housing after being combined.

[0033] Figure 8 express Figure 1-Figure 4 A three-dimensional view of the base in FIG.

[0034] Fig. 9 A three-dimensional diagram showing the circuit board and base combined.

[0035] Fig.10 A three-dimensional diagram showing that the carrier and the coil are arranged inside the base.

[0036] Fig.11 A top view showing the carrier and the coil being arranged inside the base.

[0037] Fig.12 A schematic diagram showing that the positioning posts on the housing H and the protrusions on the base do not overlap each other in the direction of the optical axis O (Z axis).

[0038] Fig.13 A schematic diagram showing that the opening directions of the grooves of the two electrical connection portions are opposite to each other.

[0039] Fig.14 An enlarged cross-sectional view showing the conductive member embedded in the interior of a boss (first boss) of a base.

[0040] The reference numerals are as follows:

[0041] 100: Driving mechanism

[0042] B: Base

[0043] B1: Positioning column (first positioning column)

[0044] B11: Limiting structure

[0045] B2: Positioning column (second positioning column)

[0046] B21: Limiting structure

[0047] B3: convex pillar (first convex pillar)

[0048] B31: Opening

[0049] B4: Boss (second boss)

[0050] B5: convex column

[0051] B6: convex column

[0052] BP: Bump

[0053] BS: Lower reed

[0054] BS1: Electrical connection

[0055] BS2: Groove

[0056] BS3: Perforation

[0057] BT: Conductive parts

[0058] C: Coil

[0059] F: Circuit Board

[0060] FS: Upper reed

[0061] H: Shell

[0062] h: side wall

[0063] H0: Top cover

[0064] H1: Boss

[0065] H2: Groove

[0066] H3: Positioning column

[0067] H4: Center point

[0068] HM:Magnet

[0069] HS: Magnetic field sensing element

[0070] L1: Diagonal

[0071] L2: Diagonal

[0072] LH: Bearing

[0073] LH1: Winding column

[0074] LH2: Card Block

[0075] M: Magnetic components

[0076] O: Optical axis

[0077] W: Wire DETAILED DESCRIPTION

[0078] The following describes the drive mechanism of the embodiment of the utility model. However, it is easy to understand that the embodiment of the utility model provides many suitable utility model concepts and can be implemented in a wide variety of specific backgrounds. The specific embodiments disclosed are only used to illustrate the use of the utility model in a specific way, and are not used to limit the scope of the utility model.

[0079] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure belongs. It is understood that these terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with the background or context of the relevant technology and the present disclosure, and should not be interpreted in an idealized or overly formal manner unless specifically defined herein.

[0080] The above and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only referenced to the directions of the attached drawings. Therefore, the directional terms used in the embodiments are used to illustrate and not to limit the present invention.

[0081] First, please refer to Figures 1 to 4 ,in Figure 1 FIG. 1 is an exploded view of a driving mechanism 100 according to an embodiment of the present invention. Figure 2 express Figure 1 Another exploded view of the driving mechanism 100, Figure 3 express Figure 1 and Figure 2 The driving mechanism 100 is a cross-sectional view after assembly, Figure 4 express Figure 1 and Figure 2 Another cross-sectional view of the drive mechanism 100 after assembly.

[0082] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the driving mechanism 100 of the present embodiment is, for example, a voice coil motor (VCM), which can be installed in a mobile phone or other portable electronic device to drive an optical element (such as an optical lens) to move, thereby achieving functions such as auto focusing (AF) or optical image stabilization (OIS).

[0083] The driving mechanism 100 mainly includes a hollow plastic housing H, a plastic base B, a circuit board F, a carrier LH, an upper spring FS, at least one lower spring BS, at least one magnetic element M and at least one coil C.

[0084] In this embodiment, the shell H has a hollow structure and is combined with the base B, and the circuit board F is fixed to one side of the shell H, wherein the shell H and the base B can together constitute a fixed part of the driving mechanism 100, and the positioning columns B1, B2 and the bosses B3~B6 on the base B will extend into the shell H. During assembly, the positioning columns B1, B2 and the bosses B3~B6 can be bonded to the inner surface of the shell H by glue.

[0085] The carrier LH is movably accommodated in the housing H, and an optical element (not shown) can be fixed in the carrier LH, wherein the carrier LH constitutes a movable portion that can move relative to the fixed portion (housing H and base B).

[0086] Specifically, the aforementioned carrier LH is connected to the housing H and the base B through the upper and lower springs FS and BS, respectively, so that the carrier LH can be suspended in the driving mechanism 100 in a movable manner. Through the aforementioned mechanism configuration, external light can enter the driving mechanism 100 along the optical axis O (Z-axis direction) of the optical element, and the light will pass through the optical element (such as an optical lens) and reach an image sensing element (not shown) located below the base B, thereby generating a digital image.

[0087] It should be particularly noted that a coil C is provided on both sides of the aforementioned carrier LH, and a magnetic element M (such as a magnet) corresponding to the aforementioned coil C is provided on the inner side of the shell H, wherein the aforementioned coil C and the magnetic element M can constitute a driving component.

[0088] When a current signal is applied to the aforementioned coil C, the magnetic force generated between the coil C and the magnetic element M can drive the carrier LH and the optical element disposed therein to move relative to the base B and the shell H along the optical axis O direction (Z-axis direction), thereby achieving the function of auto focus (AF) or optical image stabilization (OIS).

[0089] Depend on Figure 1 and Figure 3 As can be seen in FIG. 1 , a magnet HM is provided on one side of the carrier LH, and a magnetic field sensing element HS is provided on the circuit board F. Figure 3) is used to sense the position change of the magnet HM. For example, the magnetic field sensing element HS may be a Hall effect sensor, a magnetoresistive sensor (MR sensor), or a fluxgate sensor, etc., which can be used to sense the position of the magnet HM, so as to know the position change of the carrier 40 relative to the fixing part (shell H and base B).

[0090] On the other hand, from Figure 1 and Figure 3 It can also be seen that two conductive parts BT protrude from one side of the plastic base B, wherein the conductive parts BT are combined into the plastic base B by insert molding. Specifically, one end of the conductive part BT is exposed at the top side of the base B, and the lower spring BS can be electrically connected to the conductive part BT by welding.

[0091] Please also refer to Figure 1 to Figure 7 ,in Figure 5 express Figure 1-Figure 4 A perspective view of the housing H in FIG. Figure 6 The bottom view shows the upper spring FS and the housing H after they are combined. Figure 7 A three-dimensional diagram showing the circuit board F, the magnetic element M, the upper spring sheet FS and the housing H after being combined.

[0092] like Figure 1 , Figure 2 and Figure 5 As shown, the housing H is generally quadrilateral, and has a top cover H0 and four side walls h extending from the top cover H0 toward the base B. It should be noted that two long strip-shaped bosses H1 ( Figure 5 ), the boss H1 protrudes from the inner surface of the top cover H0 toward the base B, adjacent to and extending along two opposite sides of the four side walls h, and grooves H2 (such as Figure 5 In addition, two positioning posts H3 are formed on the two bosses H1 near two adjacent side walls h.

[0093] from Figure 6 and Figure 7 It can be seen that during assembly, the upper spring sheet FS can be supported on the surface of the boss H1 on the inner side of the top cover H0, and the positioning column H3 can be passed through the corresponding holes of the upper spring sheet FS, so that the four corners of the upper spring sheet FS can be accurately positioned on the inner side of the top cover H0 of the shell H; then, the magnetic element M, the upper spring sheet FS and the shell H can be bonded to each other by glue, wherein the upper spring sheet FS is clamped between the magnetic element M and the shell H.

[0094] It should be noted that the four positioning posts H3 in this embodiment can define two diagonal lines L1 and L2. The intersection of the two diagonal lines L1 and L2 is the center point of the four positioning posts H3. The aforementioned center point is located on the optical axis O of the optical element and deviates from the center point H4 of the quadrilateral shell H.

[0095] On the other hand, from Figure 3 and Figure 7 It can be seen that the circuit board F is fixed on a side wall h of the housing H after assembly, and its position is adjacent to the aforementioned groove H2. It should be understood that in the process of applying glue to the positioning column H3 to bond the housing H and the upper spring sheet FS, the aforementioned groove H2 can be used to accommodate overflowing glue to prevent the glue from interfering with the circuit board F or other components in the housing H after solidification to affect assembly, thereby greatly improving the reliability of the driving mechanism 100.

[0096] Please also read Figure 8 and Fig. 9 ,in Figure 8 express Figure 1-Figure 4 A three-dimensional view of the base B in FIG. Fig. 9 A three-dimensional diagram showing the circuit board F and the base B after being combined.

[0097] like Figure 8 and Fig. 9 As shown, the four corners of the base B of this embodiment are respectively formed with protrusions B3~B6 extending in the Z-axis direction. In addition, two positioning columns B1 and B2 extending in the Z-axis direction are formed on one side of the base B, wherein the aforementioned positioning columns B1 and B2 are located between the two protrusions B3 and B4.

[0098] Specifically, a limiting structure B11 and B21 are respectively formed at the ends of the aforementioned positioning column B1 (first positioning column) and the positioning column B2 (second positioning column). During assembly, the circuit board F can be set between the two protruding columns B3 and B4, and the top side of the circuit board F can be abutted against the limiting structures B11 and B21 on the positioning columns B1 and B2. The limiting structures B11 and B21 extend toward the direction of the circuit board F, and in the direction of the optical axis O (Z axis), the limiting structures B11 and B21 partially overlap with the circuit board F, thereby allowing the circuit board F to be accurately positioned at a preset position in the direction of the optical axis O (Z axis).

[0099] In one embodiment, the left side surface of the circuit board F can also be made to abut the boss B3, so that the circuit board F can be accurately positioned at a preset position in the X-axis direction (first axial direction), wherein when observed from the optical axis O (Z-axis) direction, the distance between the magnetic field sensing element HS on the circuit board F and the boss B3 (first boss) is smaller than the distance between the aforementioned magnetic field sensing element HS and the boss B4 (second boss).

[0100] It should be understood that since the magnetic field sensing element HS on the circuit board F is closer to the boss B3 and the left side of the circuit board F abuts the boss B3, the positioning of the magnetic field sensing element HS is less susceptible to the structural deflection of the circuit board F (such as a flexible circuit board) and assembly errors, thereby greatly improving the positioning accuracy of the magnetic field sensing element HS during assembly.

[0101] On the other hand, the conductive member BT protruding from the plastic base B is electrically connected to the terminal on the bottom side of the circuit board F, so that the electrical signal provided by the external circuit can be transmitted to the coil C on the carrier LH through the circuit board F, the conductive member BT, and the lower spring BS in sequence.

[0102] Please also refer to Figure 1 , Figure 2 , Fig.10 , Fig.11 and Fig.12 ,in Fig.10 A three-dimensional diagram showing that the carrier LH and the coil C are arranged inside the base B, Fig.11 A top view showing the carrier LH and the coil C arranged inside the base B, Fig.12 A schematic diagram showing that the positioning column H3 on the housing H and the protrusion BP on the base B do not overlap each other in the direction of the optical axis O (Z axis), Fig.13 A schematic diagram showing that the opening directions of the grooves BS2 of the two electrical connecting portions BS1 are opposite to each other.

[0103] like Figure 1 , Figure 2 , Fig.10 , Fig.11 , Fig.12 and Fig.13 As shown, two winding posts LH1 are formed on the same side of the carrier LH of the present embodiment. The two winding posts LH1 can extend in the same direction toward the circuit board F. When viewed from the optical axis O (Z axis), the distance between the two winding posts LH1 and the protrusion B3 (first protrusion) is greater than the distance between the magnetic field sensing element HS and the protrusion B3 (first protrusion). One end of the two wires W is connected to the coil C respectively, and the other end is wound on the winding posts LH1 respectively. During assembly, the wires W on the two winding posts LH1 can be connected to the electrical connection portion BS1 at the end of the lower spring sheet BS respectively by welding or soldering. In this way, the electrical signal provided by the external circuit can be transmitted to the coil C on the carrier LH in sequence through the circuit board F, the conductive element BT, the lower spring sheet BS and the wires W. By arranging the magnetic field sensing element HS and the two winding posts LH1 closer to the protrusion B3 and the protrusion B4 respectively, the size of the overall driving mechanism in the Y axis direction can be effectively shortened. In other embodiments, the positions of the magnetic field sensing element HS and the two winding posts LH1 on the X-axis may also be swapped.

[0104] In addition, from Fig. 9 , Fig.10 , Fig.11 and Fig.12 As can be seen in the figure, protrusions BP are formed at the four corners of the base B, wherein the protrusions BP can pass through the lower spring sheet BS to fix the lower spring sheet BS at a preset position inside the base B. It should be understood that the positioning column H3 on the housing H and the protrusions BP on the base B do not overlap each other in the direction of the optical axis O (Z axis) (e.g. Fig.12 shown).

[0105] from Fig.11 , Fig.12 and Fig.13 It can also be seen that the two electrical connection parts BS1 on the lower spring sheet BS are located on the same side of the base B and adjacent to the winding post LH1, and each electrical connection part BS1 is formed with a groove BS2, wherein the opening directions of the aforementioned grooves BS2 are opposite to each other, so that it is convenient to observe from the outside of the electrical connection part BS1 whether the connection condition between the electrical connection part BS1 and the wire W is good.

[0106] In addition, from Fig.11 It can be seen that the wire W, one end of which is fixed on the winding post LH1, will extend through the gap between the magnet HM and the carrier LH and connect to the coil C, that is, the aforementioned wire W will be closer to the optical axis O than the magnet HM. This setting can shorten the length of the wire W used and simplify the assembly process. In addition, the distance between the magnetic field sensing element HS and the positioning post B2 (the second positioning post) is greater than the distance between the magnetic field sensing element HS and the positioning post B1 (the first positioning post), and the thickness of the positioning post B2 (the second positioning post) in the Y-axis direction (the second axial direction) is greater than the thickness of the positioning post B1 (the first positioning post) in the Y-axis direction (the second axial direction).

[0107] It should be understood that when the driving mechanism 100 is impacted by external force, the carrier LH will first contact the positioning posts B1 and B2 to prevent the carrier LH from directly colliding with the electronic components on the circuit board F and causing damage to their functions or structures.

[0108] On the other hand, from Fig.13 It can be seen that a block LH2 is formed on the bottom side of the carrier LH, wherein the block LH2 extends toward the base B and passes through the lower spring sheet BS. During assembly, glue can be applied around the block LH2 to bond the carrier LH and the lower spring sheet BS.

[0109] In addition, a long strip-shaped through hole BS3 is formed on the lower spring sheet BS. The through hole BS3 is located between the groove BS2 and the block LH2. It can be used to block the heat generated during soldering / welding between the wire W on the winding post LH1 and the electrical connection portion BS1 of the lower spring sheet BS, so as to prevent the glue around the block LH2 from melting and causing the lower spring sheet BS to fall off the carrier LH.

[0110] Please see again Fig.14 ,in Fig.14 An enlarged cross-sectional view showing the conductive member BT embedded in the inside of the boss B3 (first boss) of the base B.

[0111] like Fig.14 As shown, the conductive member BT is integrated into the plastic base B by insert molding, wherein a portion of the conductive member BT extends into the boss B3 (first boss) to enhance the structural strength of the boss B3.

[0112] It should be particularly noted that an opening B31 is formed on one side of the aforementioned boss B3, wherein the aforementioned opening B31 can be filled with glue to bond the conductive part BT and the boss B3, thereby strengthening the fixing effect between the conductive part BT and the base B.

[0113] Although the embodiments and advantages of the utility model have been disclosed as above, it should be understood that those skilled in the art may make changes, substitutions and modifications without departing from the spirit and scope of the utility model. In addition, the scope of protection of the utility model is not limited to the processes, machines, manufactures, material compositions, devices, methods and steps in the specific embodiments described in the specification. Any technician in the relevant technical field can understand the current or future developed processes, machines, manufactures, material compositions, devices, methods and steps from the disclosure of the utility model. As long as they can implement roughly the same functions or obtain roughly the same results in the embodiments described herein, they can be used according to the utility model. Therefore, the scope of protection of the utility model includes the above-mentioned processes, machines, manufactures, material compositions, devices, methods and steps. In addition, each claim constitutes an individual embodiment, and the scope of protection of the utility model also includes the combination of each claim and embodiment.

[0114] Although the present invention has been disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Those skilled in the art may make slight changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the attached claims.

Claims

1. A driving mechanism for driving an optical element to move, wherein the optical element has an optical axis, characterized in that: The driving mechanism comprises: A fixing portion, comprising a plastic shell and a base connected to each other, wherein the shell is formed with a top cover, at least one side wall and at least one boss, the side wall extends from the top cover toward the base, the boss protrudes from an inner surface of the top cover, and a groove is formed between the boss and the side wall; an upper spring fixed to the boss; a movable portion movably connected to the fixed portion, wherein the optical element is disposed on the movable portion; and A driving assembly is used to drive the movable part to move relative to the fixed part.

2. The driving mechanism according to claim 1, characterized in that: The shell is quadrilateral, and is further formed with two bosses and four positioning columns passing through the upper spring sheet, the four positioning columns are located on the two bosses and define two diagonal lines, wherein the intersection of the two diagonal lines deviates from the center point of the shell.

3. The driving mechanism according to claim 2, characterized in that: The intersection point of the two diagonal lines is located on the optical axis.

4. The driving mechanism according to claim 1, characterized in that: The driving component has a coil and a magnetic element. The coil is arranged on the movable part. The magnetic element is fixed on the shell. The upper spring sheet is clamped between the magnetic element and the boss.

5. The driving mechanism according to claim 1, characterized in that: The driving mechanism also includes a circuit board, and the base is formed with a first positioning column and a second positioning column, wherein the first and second positioning columns are respectively formed with a limiting structure, and the two limiting structures abut the circuit board to position the circuit board at a preset position in the direction of the optical axis.

6. The driving mechanism according to claim 5, characterized in that: The base is further formed with a first protrusion and a second protrusion. The circuit board is located between the first protrusion and the second protrusion in a first axial direction, and the circuit board abuts against the first protrusion, wherein the first axial direction is perpendicular to the optical axis.

7. The driving mechanism according to claim 6, characterized in that: The driving mechanism also includes a magnet arranged on the movable part and a magnetic field sensing element arranged on the circuit board, for sensing the position change of the movable part relative to the fixed part, wherein the distance between the magnetic field sensing element and the first boss is greater than the distance between the magnetic field sensing element and the second boss.

8. The driving mechanism according to claim 6, characterized in that: The thickness of the second positioning post in a second axial direction is greater than the thickness of the first positioning post in the second axial direction, wherein the second axial direction is perpendicular to the first axial direction and the optical axis.

9. The driving mechanism according to claim 8, characterized in that: The driving mechanism also includes a magnet arranged on the movable part and a magnetic field sensing element arranged on the circuit board, for sensing the position change of the movable part relative to the fixed part, wherein the distance between the magnetic field sensing element and the second boss is greater than the distance between the magnetic field sensing element and the first boss.

10. The driving mechanism according to claim 1, characterized in that: The driving mechanism also includes a conductive part and a glue. The base is formed with a first protrusion extending toward the optical axis, and the conductive part is embedded in the first protrusion, wherein the first protrusion is formed with an opening, and the glue is filled in the opening to bond the conductive part and the first protrusion.

11. The driving mechanism according to claim 1, characterized in that: The driving mechanism also includes a lower spring sheet connecting the base and the movable part, the shell is also formed with a plurality of positioning columns passing through the upper spring sheet, and the base is formed with a plurality of protrusions passing through the lower spring sheet, wherein the plurality of positioning columns and the plurality of protrusions do not overlap with each other in the direction of the optical axis.

12. The driving mechanism according to claim 1, characterized in that: The driving mechanism also includes two wires, and the driving component has two coils and two magnetic elements. The two coils are arranged on the movable part, and the two magnetic elements are fixed on the shell. The movable part has two winding poles, wherein the two winding poles are located on the same side of the movable part, and the two wires are electrically connected to the two coils and are respectively wound around the two winding poles.

13. The driving mechanism according to claim 12, characterized in that: The driving mechanism also includes a circuit board, a magnet arranged on the movable part, and a magnetic field sensing element arranged on the circuit board, wherein the base is formed with a first boss and a second boss, the circuit board is located between the first boss and the second boss in a first axial direction, and the circuit board abuts the first boss, wherein the magnetic field sensing element is used to sense the position change of the movable part relative to the fixed part, the first axial direction is perpendicular to the optical axis, and the distance between the two winding posts and the first boss is greater than the distance between the magnetic field sensing element and the first boss.

14. The driving mechanism according to claim 13, characterized in that: One of the two wires extends through the gap between the magnet and the movable portion and is closer to the optical axis than the magnet.

15. The driving mechanism according to claim 12, characterized in that: The driving mechanism further comprises two lower spring sheets connected to the base and the movable part, and the two lower spring sheets respectively have an electrical connection portion, wherein the two electrical connection portions are adjacent to the two winding posts and respectively electrically connected to the two wires.

16. The driving mechanism according to claim 15, characterized in that: The two electrical connection parts are respectively formed with a groove, and the opening directions of the two grooves are opposite to each other.

17. The driving mechanism according to claim 16, characterized in that: At least one of the two lower spring sheets is formed with a through hole, and the movable portion is formed with a clamping block passing through the lower spring sheet, wherein the through hole is located between the groove and the clamping block.

18. The driving mechanism according to claim 1, characterized in that: The shell is also formed with two bosses, and the two bosses are located at opposite sides of the shell.

19. The driving mechanism according to claim 1, characterized in that: The shell is also formed with a plurality of side walls and two bosses, wherein the plurality of side walls extend from the top cover toward the base, and the two bosses protrude from the inner surface of the top cover and are located on opposite sides of the top cover, wherein the upper spring is fixed to the two bosses, and a groove is formed between the two bosses and one of the plurality of side walls.

20. The driving mechanism according to claim 19, characterized in that: At least one positioning column passing through the upper spring sheet is respectively formed on the two bosses.

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