Drive mechanism

Abstract

A driving mechanism is used for driving an optical element to move and comprises a fixed part, a movable part, a driving assembly and a first guide piece. The optical element is arranged on the movable part, the driving assembly drives the movable part to move relative to the fixed part, and the first guiding piece is connected with the fixed part and the movable part and used for guiding the movable part to move relative to the fixed part.

Description

Technical Field

[0001] The present invention relates to a driving mechanism, and more particularly to a driving mechanism for 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 driving module to drive an optical element to move, thereby achieving the functions of auto focusing (AF) and optical image stabilization (OIS), wherein light can pass through the aforementioned optical element and form an image on a photosensitive element.

[0004] However, how to further miniaturize the lens driving module and improve its stability and reliability has become an important challenge for researchers in this technical field. Summary of the invention

[0005] The object 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 component. The movable portion is connected to the fixed portion, and the optical element is disposed on the movable portion, and the driving component is used to drive the movable portion to move relative to the fixed portion.

[0007] In one embodiment, the driving mechanism further includes a first guide member, which is disposed on the fixed portion and connected to the movable portion, and is used to guide the movable portion to move relative to the fixed portion along the optical axis.

[0008] In one embodiment, the driving mechanism further comprises a first magnet disposed on the movable portion, and the movable portion has a first recessed portion, wherein the first magnet generates a first magnetic attraction force with the first guide member, thereby maintaining contact between the first guide member and the first recessed portion.

[0009] In one embodiment, the driving mechanism further includes a first magnet cover, which is disposed on the movable portion and shields the first magnet, wherein the first magnet cover is located between the first magnet and the first guide member.

[0010] In one embodiment, the first magnet cover is a metal sheet without magnetic conductivity.

[0011] In one embodiment, a distance is provided between the first magnet cover and the first guide member.

[0012] In one embodiment, the movable portion further has a first protrusion, and the first magnet cover forms a first slot, wherein the first protrusion is embedded in the first slot.

[0013] In one embodiment, the first magnet is a single-pole or multi-pole magnet.

[0014] In one embodiment, the direction of the magnetic lines of force of the first magnet is parallel to a first axial direction, and the first axial direction is perpendicular to the optical axis.

[0015] In one embodiment, a center line connecting the first magnet and the first guide member is parallel to the first axial direction.

[0016] In one embodiment, the first recessed portion has a V-shaped structure.

[0017] In one embodiment, the driving mechanism further includes a second guide member disposed on the fixed portion and connected to the movable portion, for guiding the movable portion to move relative to the fixed portion along the optical axis, wherein the first and second guide members are located at two opposite corners of the fixed portion.

[0018] In one embodiment, the driving mechanism further includes a second magnet disposed on the movable portion, and the movable portion has a second recessed portion, wherein the second magnet generates a second magnetic attraction force with the second guide member, thereby maintaining contact between the second guide member and a contact surface of the second recessed portion.

[0019] In one embodiment, the driving mechanism further includes a second magnet cover, which is disposed on the movable portion and shields the second magnet, wherein the abutting surface is located between the second magnet and the second guide member.

[0020] In one embodiment, the movable portion further has a second protrusion, and the second magnet cover forms a second slot, wherein the second protrusion is embedded in the second slot.

[0021] In one embodiment, directions of magnetic lines of force of the first and second magnets are parallel to a first axial direction, and the first axial direction is perpendicular to the optical axis.

[0022] In one embodiment, the abutting surface is a plane perpendicular to the first axial direction.

[0023] In one embodiment, the base has a first protruding column and a second protruding column, and the first and second guiding members are fixed on the first and second protruding columns respectively.

[0024] In one embodiment, the first and second protrusions are located at two opposite corners of the base.

[0025] In one embodiment, at least a portion of the second protrusion is located in the second recess.

[0026] The beneficial effect of the present invention lies in that the present invention arranges a first guide member and a second guide member on the fixed part of the driving mechanism, and arranges a first magnetic unit and a second magnetic unit corresponding to the first and second guide members respectively on the movable part, so that a magnetic attraction force can be generated so that the movable part can be stably supported on the first and second guide members, so that the driving mechanism can stably perform the autofocus (AF) or optical image stabilization (OIS) function, and can operate and image normally in a shaking environment to provide good image quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 An exploded view of a driving mechanism according to an embodiment of the present invention is shown.

[0028] Figure 2 express Figure 1 Another exploded view of the drive mechanism.

[0029] Figure 3 express Figure 1 and Figure 2 A three-dimensional view of the drive mechanism after assembly.

[0030] Figure 4 express Figure 1 and Figure 2 Another perspective view of the drive mechanism after assembly.

[0031] Figure 5 An exploded view showing the first magnetic unit and the second magnetic unit before being combined with the carrier.

[0032] Figure 6 A three-dimensional diagram showing the first magnetic unit and the second magnetic unit after being combined with the carrier.

[0033] Figure 7 A three-dimensional diagram from another perspective showing the first magnetic unit and the second magnetic unit combined with the carrier.

[0034] Figure 8 express Figure 3 and Figure 4 A top view of the drive mechanism after removing the housing and frame F.

[0035] Fig. 9 express Figure 8 Magnified view of area A1 in FIG.

[0036] Fig.10 express Figure 8 Magnified view of area A2 in FIG.

[0037] Fig.11 An exploded view showing the first magnetic unit.

[0038] Fig.12 A schematic diagram showing that the first magnetic unit is installed in the first groove of the carrier.

[0039] Fig.13 An exploded view showing the second magnetic unit.

[0040] Fig.14 A schematic diagram showing that the second magnetic unit is installed in the second groove of the carrier.

[0041] The reference numerals are as follows:

[0042] 100: Driving mechanism

[0043] A1: Area

[0044] A2: Area

[0045] B: Plastic base

[0046] B1: First boss

[0047] B2: Second boss

[0048] BS: Lower reed

[0049] C: Coil

[0050] E: Circuit components

[0051] F: Framework

[0052] H: Shell

[0053] L1: Center line

[0054] L2: Center Line

[0055] LH: Bearing

[0056] LH1: first recessed part

[0057] LH11: First bump

[0058] LH1': First groove

[0059] LH2: Second recessed portion

[0060] LH20: Butt surface

[0061] LH21: Second bump

[0062] LH2': Second groove

[0063] M: Magnetic components

[0064] m1: first magnetic unit

[0065] m11: first magnet

[0066] m12: First magnet cover

[0067] m121: First card slot

[0068] m2: second magnetic unit

[0069] m21: Second magnet

[0070] m22: Second magnet cover

[0071] m221: Second card slot

[0072] N: Winding column

[0073] O: Optical axis

[0074] R1: First guide

[0075] R2: Second guide DETAILED DESCRIPTION

[0076] The following describes the drive mechanism of the embodiment of the present invention. However, it is easy to understand that the embodiment of the present invention provides many suitable inventive concepts and can be implemented in a wide variety of specific contexts. The specific embodiments disclosed are only used to illustrate the use of the present invention in a specific way, and are not intended to limit the scope of the present invention.

[0077] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meanings 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.

[0078] 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 are not used to limit the present invention.

[0079] First, please refer to Figures 1 to 4 ,in Figure 1 An exploded view of a driving mechanism 100 according to an embodiment of the present invention is shown. 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 three-dimensional view after assembly, Figure 4 express Figure 1 and Figure 2 Another perspective view of the drive mechanism 100 after assembly.

[0080] 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 inside 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 focus (AF) or optical image stabilization (OIS).

[0081] The driving mechanism 100 includes a hollow shell H, a polygonal plastic base B, a first guide member R1, a second guide member R2, a circuit component E (such as a flexible circuit board), at least one lower spring BS, a carrier LH, a frame F, at least one magnetic element M, at least one coil C, a first magnetic unit m1 and a second magnetic unit m2.

[0082] In this embodiment, the housing H has a hollow structure and is combined with the base B, thereby forming a fixed portion of the driving mechanism 100. On the other hand, the circuit component E is fixed on the base B and surrounds an optical axis O of the optical element, and the lower spring BS is disposed on the top side of the base B and connected to the carrier LH, wherein the circuit component E can be electrically connected to the coil C disposed on the carrier LH through the lower spring BS, thereby forming a loop.

[0083] It should be understood that the aforementioned carrier LH is movably accommodated in the shell H, and the aforementioned optical element (not shown) can be fixed in the carrier LH, wherein the aforementioned carrier LH constitutes a movable part that can move relative to the aforementioned fixed part (shell H and base B).

[0084] Specifically, the aforementioned carrier LH is connected to the base B via the lower spring BS, 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 lens and reach an image sensing element (not shown) located below the base B, thereby generating a digital image.

[0085] It should be particularly noted that the aforementioned frame F is fixed on the inner side of the shell H, wherein magnetic elements M (such as magnets) are respectively provided on the four sides of the frame F, and furthermore, a coil C is respectively provided on the four sides of the aforementioned carrier LH, corresponding to the aforementioned magnetic element M, wherein the aforementioned coil C and the magnetic element M can constitute a driving component.

[0086] 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 autofocus (AF) or optical image stabilization (OIS).

[0087] Depend on Figure 1 and Figure 2 It can be seen that the first guide member R1 and the second guide member R2 are respectively a guide rod, and a first convex column B1 and a second convex column B2 are formed on the top side of the base B. Specifically, the first guide member R1 is fixed to a corner of the base B2 and abuts against the first convex column B1, and the second guide member R2 is fixed to another corner of the base B and abuts against the second convex column B2, wherein the first convex column B1 and the second convex column B2 are located on opposite sides of the carrier LH.

[0088] On the other hand, a first recessed portion LH1 and a second recessed portion LH2 are formed on the aforementioned carrier LH. When the driving mechanism 100 is assembled, the aforementioned first guide member R1 will be clamped between the first boss B1 and the first recessed portion LH1, and the aforementioned second guide member R2 will be clamped between the second boss B2 and the second recessed portion LH2, wherein the aforementioned first guide member R1 and the second guide member R2 can be used to guide the carrier LH to move along the optical axis O direction (Z-axis direction) relative to the fixed part (shell H and base B).

[0089] In the present embodiment, the first magnetic unit m1 and the second magnetic unit m2 are respectively disposed at two opposite corners of the carrier LH, so as to adsorb and fix the first guide member R1 and the second guide member R2 on the base B, respectively.

[0090] Next, please refer to Figure 5 ,in Figure 5An exploded view showing the first magnetic unit m1 and the second magnetic unit m2 before being combined with the carrier LH.

[0091] like Figure 5 As shown, a pair of winding posts N are formed at two opposite corners of the carrier LH. During assembly, one end of four wires (not shown) can be wound around the winding posts N respectively, and the other ends can be connected to four coils C respectively. Then, the wires on the winding posts N can be electrically connected to the corresponding lower spring sheets BS under the winding posts N by welding or soldering. In this way, the circuit component E can transmit the current signal to the coil C through the lower spring sheet BS.

[0092] In addition, from Figure 5 As can be seen from the figure, the first magnetic unit m1 includes a first magnet m11 and a first magnet cover m12, and the second magnetic unit m2 includes a second magnet m21 and a second magnet cover m22, wherein the first magnetic unit m1 is installed in the first groove LH1' of the carrier LH, and the second magnetic unit m2 is installed in the second groove LH2' of the carrier LH (as shown in FIG. Figure 1 and Figure 2 shown).

[0093] Please also refer to Figure 6 and Figure 7 ,in Figure 6 A three-dimensional diagram showing the first magnetic unit m1 and the second magnetic unit m2 after being combined with the carrier LH, Figure 7 A three-dimensional diagram from another perspective showing the first magnetic unit m1 and the second magnetic unit m2 combined with the carrier LH.

[0094] like Figure 6 As shown, the first magnetic unit m1 is located adjacent to the first recessed portion LH1 on the carrier LH, wherein the first magnet cover m12 covers the first magnet m11 after assembly to prevent the first magnet m11 from being exposed.

[0095] In addition, if Figure 6 and Figure 7 As shown, the second magnetic unit m2 is located adjacent to the second recessed portion LH2 on the carrier LH, wherein the second magnet cover m22 will cover the second magnet m21 after assembly to prevent the second magnet m21 from being exposed.

[0096] For example, the first magnet m11 and the second magnet m21 can be single-pole magnets or multi-pole magnets, and the first magnet cover m12 and the second magnet cover m22 can be made of non-magnetic metal sheets to protect and fix the first magnet m11 and the second magnet m21. In addition, the first magnet cover m12 and the second magnet cover m22 can also be made of low-density materials, thereby enabling the driving mechanism 100 to achieve an overall lightweight effect.

[0097] Please also read Figure 8 and Fig. 9 ,in Figure 8 express Figure 3 and Figure 4 A top view of the driving mechanism 100 after removing the housing H and the frame F, Fig. 9 express Figure 8 Magnified view of area A1 in FIG.

[0098] like Figure 8 and Fig. 9 As shown, the first recess LH1 on the carrier LH has a V-shaped structure, wherein the opening of the first recess LH1 faces the -X axis direction, and the first guide R1 is slidably abutted against two side walls of the first recess LH1.

[0099] In addition, from Fig. 9 It can be seen that the first magnetic unit m1 is hidden in a corner of the carrier LH and is adjacent to the first recess LH1 and the first guide R1, wherein the first magnet cover m12 with an L-shaped structure is located between the first magnet m11 and the first guide R1, and there is a distance between the first magnet cover m12 and the first guide R1.

[0100] In this embodiment, the magnetic pole direction of the first magnet m11 is also parallel to the X-axis (first axial direction), and the center line L1 between the first magnet m11 and the first guide member R1 is parallel to the X-axis (perpendicular to the optical axis O); in this way, a first magnetic attraction parallel to the X-axis direction can be generated between the first magnet m11 and the first guide member R1 made of metal, so that the first guide member R1 can stably maintain contact with the two side walls of the first recess LH1 without easily falling off from the first recess LH1.

[0101] Please see again Fig.10 ,in Fig.10 express Figure 8 Magnified view of area A2 in FIG.

[0102] like Fig.10As shown, the second recessed portion LH2 on the carrier LH has a contact surface LH20, wherein the second guide R2 is slidably contacted with the contact surface LH20, and at least a portion of the second protrusion B2 is located in the second recessed portion LH2.

[0103] In addition, from Fig.10 It can be seen that the second magnetic unit m2 is arranged at a corner of the carrier LH and is adjacent to the second recess LH2 and the second guide R2, wherein the abutment surface LH20 of the second recess LH2 is located between the second magnet m21 and the second guide R2, and the second magnet m21 and the second guide R2 are separated by a distance.

[0104] In this embodiment, the magnetic pole direction of the second magnet m21 is also parallel to the X-axis (first axial direction), and the center line L2 between the second magnet m21 and the second guide member R2 is also parallel to the X-axis (perpendicular to the optical axis O); in this way, a second magnetic attraction parallel to the X-axis direction can be generated between the second magnet m21 and the second guide member R2 made of metal, so that the second guide member R2 can stably maintain contact with the abutment surface LH20 of the second recessed portion LH2 without easily falling off from the second recessed portion LH2, wherein the aforementioned abutment surface LH20 is, for example, a plane roughly perpendicular to the X-axis (first axial direction).

[0105] Please also read Fig.11 and Fig.12 ,in Fig.11 An exploded view showing the first magnetic unit m1, Fig.12 A schematic diagram showing that the first magnetic unit m1 is installed in the first groove LH1 ′ of the carrier LH.

[0106] like Fig.11 As shown, the first magnetic unit m1 of this embodiment includes a first magnet m11 and a first magnet cover m12 , wherein the first magnet cover m12 has an L-shaped structure, and a plurality of first slots m121 are formed at two opposite edges of the first magnet cover m12 .

[0107] Depend on Fig.12It can be seen that a first groove LH1' is formed at a corner of the carrier LH adjacent to the first recessed portion LH1, wherein the aforementioned first magnet m11 and a first magnet cover m12 are both disposed in the first groove LH1', thereby helping to achieve miniaturization of the driving mechanism 100, and the first magnet cover m12 shields the aforementioned first magnet m11. In some embodiments, when observed along the direction of the optical axis O, the first magnet m11 overlaps with the carrier LH, but the first magnet m11 and the first magnet cover m12 do not overlap; in addition, when observed along the direction perpendicular to the optical axis O (e.g., the X-axis direction, the Y-axis direction), the first magnet m11 and the first magnet cover m12 at least partially overlap, thereby, the first magnet cover m12 can achieve the effect of protecting the first magnet m11.

[0108] It should be noted that a plurality of first protrusions LH11 are formed in the first groove LH1'. During assembly, the first protrusions LH11 can be respectively embedded in the first slots m121 of the first magnet cover m12 to prevent the first magnet m11 and the first magnet cover m12 from falling off the carrier LH.

[0109] Please also refer to Fig.13 and Fig.14 ,in Fig.13 An exploded view showing the second magnetic unit m2, Fig.14 A schematic diagram showing that the second magnetic unit m2 is installed in the second groove LH2 ′ of the carrier LH.

[0110] like Fig.13 As shown, the second magnetic unit m2 of this embodiment includes a second magnet m21 and a second magnet cover m22 , wherein the second magnet cover m22 has a U-shaped structure, and a plurality of second slots m221 are formed on the second magnet cover m22 .

[0111] Depend on Fig.14 It can be seen that a second groove LH2' adjacent to the second recessed portion LH2 is formed at another corner of the carrier LH, wherein the aforementioned second magnet m21 is disposed in the second groove LH2', thereby contributing to the miniaturization of the driving mechanism 100, and the second magnet cover m22 is disposed on the outside of the second magnet m21 to protect and shield the second magnet m21. In some embodiments, when observed along the direction of the optical axis O, the second magnet m21 at least partially overlaps with the carrier LH and the second magnet cover m22; in addition, when observed along the direction perpendicular to the optical axis O (e.g., the X-axis direction, the Y-axis direction), the second magnet m21 at least partially overlaps with the second magnet cover m22, thereby, the second magnet cover m22 can achieve the effect of protecting the second magnet m21.

[0112] It should be noted that a plurality of second protrusions LH21 are formed on the outer surface of the carrier LH. During assembly, the second protrusions LH21 can be respectively embedded in the second slots m221 of the second magnet cover m22 to prevent the second magnet m21 and the second magnet cover m22 from falling off the carrier LH.

[0113] In summary, the present invention sets a first guide member and a second guide member on the fixed part of the driving mechanism, and sets a first magnetic unit and a second magnetic unit corresponding to the first and second guide members respectively on the movable part. In this way, a magnetic attraction force can be generated so that the movable part can be stably supported on the first and second guide members, so that the driving mechanism can stably perform the auto focus (AF) or optical image stabilization (OIS) function, and can operate and image normally in a shaking environment to provide good image quality.

[0114] Although the embodiments of the present invention and their advantages have been disclosed 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 present invention. In addition, the scope of protection of the present invention is not limited to the processes, machines, manufacturing, material compositions, devices, methods and steps in the specific embodiments described in the specification. Any technician in the relevant technical field can understand from the disclosure of the present invention that the processes, machines, manufacturing, material compositions, devices, methods and steps currently or in the future can be used according to the present invention as long as they can implement substantially the same functions or obtain substantially the same results in the embodiments described herein.

[0115] Therefore, the protection scope of the present invention includes the above-mentioned processes, machines, manufactures, material compositions, devices, methods and steps. In addition, each claim constitutes a separate embodiment, and the protection scope of the present invention also includes the combination of various claims and embodiments.

[0116] Although the present invention has been disclosed above in terms of preferred embodiments, they are 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 appended claims.

Claims

1. A driving mechanism for driving an optical element to move, wherein the optical element has an optical axis, the driving mechanism comprising: a fixing portion; a movable portion movably connected to the fixed portion, wherein the optical element is disposed on the movable portion; as well as A driving assembly is used to drive the movable part to move relative to the fixed part.

2. The driving mechanism as claimed in claim 1, wherein the driving mechanism further comprises a first guide member, which is disposed on the fixed portion and connected to the movable portion, for guiding the movable portion to move relative to the fixed portion along the optical axis.

3. The driving mechanism as described in claim 2, wherein the driving mechanism also includes a first magnet arranged on the movable part, and the movable part has a first recessed part, wherein the first magnet and the first guide member generate a first magnetic attraction force, so as to keep the first guide member and the first recessed part in contact.

4. The driving mechanism as claimed in claim 3, wherein the driving mechanism further comprises a first magnet cover, which is disposed on the movable portion and shields the first magnet, wherein the first magnet cover is located between the first magnet and the first guide member. 5 . The driving mechanism as claimed in claim 4 , wherein the first magnet cover is a metal sheet without magnetic conductivity. The driving mechanism as claimed in claim 4 , wherein the first magnet cover and the first guide member are spaced apart by a distance. 7 . The driving mechanism as claimed in claim 4 , wherein the movable portion further has a first protrusion, and the first magnet cover forms a first slot, wherein the first protrusion is embedded in the first slot.

8. The driving mechanism as claimed in claim 4, wherein the first magnet is a single-pole or multi-pole magnet. 9 . The driving mechanism as claimed in claim 8 , wherein a direction of magnetic lines of force of the first magnet is parallel to a first axial direction, and the first axial direction is perpendicular to the optical axis. 10 . The driving mechanism of claim 9 , wherein a center line connecting the first magnet and the first guide member is parallel to the first axial direction. The driving mechanism as claimed in claim 3 , wherein the first recessed portion has a V-shaped structure.

12. A driving mechanism as described in claim 11, wherein the driving mechanism also includes a second guide member, which is arranged on the fixed part and connected to the movable part, for guiding the movable part to move along the optical axis relative to the fixed part, wherein the first guide member and the second guide member are located at two opposite corners of the fixed part.

13. A driving mechanism as described in claim 12, wherein the driving mechanism also includes a second magnet arranged on the movable part, and the movable part has a second recessed part, wherein the second magnet and the second guide member generate a second magnetic attraction force, so as to keep the second guide member and a contact surface of the second recessed part in contact. 14 . The driving mechanism as claimed in claim 13 , further comprising a second magnet cover disposed on the movable portion and shielding the second magnet, wherein the abutting surface is located between the second magnet and the second guide member. 15 . The driving mechanism as claimed in claim 14 , wherein the movable portion further has a second protrusion, and the second magnet cover forms a second slot, wherein the second protrusion is embedded in the second slot.

16. The driving mechanism as claimed in claim 13, wherein directions of magnetic lines of force of the first and second magnets are parallel to a first axial direction, and the first axial direction is perpendicular to the optical axis. The driving mechanism of claim 16 , wherein the abutting surface is a plane perpendicular to the first axial direction. 18 . The driving mechanism of claim 13 , wherein the fixing portion has a first protruding column and a second protruding column, and the first and second guiding members are fixed on the first and second protruding columns respectively.

19. The driving mechanism of claim 18, wherein the first and second protrusions are located at two opposite corners of the fixing portion.

20. The driving mechanism of claim 19, wherein at least a portion of the second protrusion is located in the second recess.

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