Drive mechanism

Abstract

A driving mechanism comprises a movable part, a fixed part and a driving assembly. The movable part is movably connected with the fixed part and is used for bearing an optical element. The driving assembly can be 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 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 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, comprising a movable part, a fixed part and a driving assembly. The movable part is used to connect an optical element, and the optical element has an optical axis. The movable part can move relative to the fixed part, and the driving assembly can be used to drive the movable part to move relative to the fixed part.

[0007] In one embodiment, the movable portion includes a first member and a second member that are fixed to each other and are hollow, and the driving assembly includes a first driving element disposed on the second member to drive the movable portion to move relative to the fixed portion.

[0008] In one embodiment, the driving mechanism further includes a frame movably connecting the movable portion and the fixed portion, and the driving assembly further includes a second driving element disposed on the frame for driving the movable portion to move relative to the fixed portion.

[0009] In one embodiment, the driving mechanism further includes an upper spring sheet and a plurality of elastic elements, the fixing portion includes a shell and a base connected to each other, wherein the upper spring sheet connects the frame and the first component, and the elastic element connects the frame and the base.

[0010] In one embodiment, the driving mechanism further includes an electronic element disposed on the first component, and when viewed along a horizontal direction, the electronic element and the first driving element overlap with each other, wherein the horizontal direction is perpendicular to the optical axis.

[0011] In one embodiment, the first component has an extension portion, the electronic component is disposed on the extension portion, and the extension portion is between the first driving component and the electronic component.

[0012] In one embodiment, the first driving element includes a coil surrounding the second component.

[0013] In one embodiment, the second component is formed with a first side surface, a second side surface and a side wall connecting the first and second side surfaces, the first side surface is perpendicular to the second side surface, and a gap is formed between the coil and the side wall.

[0014] In one embodiment, the second component has a body and two protrusions extending outward from the body, and two ends of the coil are respectively wound around the protrusions.

[0015] In one embodiment, the main body extends into the first component.

[0016] In one embodiment, the driving mechanism further includes a plurality of conductive members embedded in the first component and exposed on the top side of the first component.

[0017] In one embodiment, the driving mechanism further includes a frame and an upper spring, the frame movably connects the movable portion and the fixed portion, and the upper spring connects the frame and the first component, wherein the conductive element is electrically connected to the upper spring.

[0018] In one embodiment, the second component is formed with a connecting surface, a side wall surface and a limiting surface, the connecting surface is fixed to a bottom surface of the first component, and the side wall surface is adjacent to the limiting surface and the connecting surface, wherein the side wall surface and the limiting surface form a groove for accommodating the first driving element.

[0019] In one embodiment, the driving mechanism further includes a glue, the first driving element includes a coil, and the glue bonds the coil, the first component and the second component, wherein the limiting surfaces of the coil and the second component are separated by a first distance, and the side wall surfaces of the coil and the second component are separated by a second distance, and the second distance is different from the first distance.

[0020] In one embodiment, the second distance is greater than the first distance.

[0021] In one embodiment, the driving mechanism further includes an electronic element, and the first component has an extension portion, the electronic element is disposed on the extension portion, and when viewed along a horizontal direction, the extension portion and the first driving element overlap with each other, wherein the horizontal direction is perpendicular to the optical axis.

[0022] In one embodiment, a third distance is spaced between the coil and the extending portion, wherein the third distance is different from the first distance and the second distance.

[0023] In one embodiment, the third distance is greater than the second distance.

[0024] In one embodiment, the electronic element includes a magnetic field sensor, and the first driving element includes a coil.

[0025] In one embodiment, the inner diameter of the first component is greater than the inner diameter of the second component.

[0026] The beneficial effect of the utility model is that the utility model mainly makes the first component and the second component bonded to each other to form a movable part for carrying the optical element, wherein a conductive member can be embedded inside the first component to conduct electrical signals, and a coil can be set on the second component to drive the movable part to move relative to the fixed part. In this way, not only can the overall size of the driving mechanism be effectively reduced to achieve the purpose of miniaturization of the product, but also the performance and reliability of the driving mechanism can be greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0028] Figure 2 express Figure 1 Exploded view of the drive mechanism with the housing removed.

[0029] Figure 3 express Figure 1 Another exploded view of the drive mechanism after removing the shell.

[0030] Figure 4A three-dimensional diagram showing the movable part, the coil and the magnetic field sensing element after assembly.

[0031] Figure 5 express Figure 4 Exploded view of the first component before the second component is combined.

[0032] Figure 6 express Figure 4 Another exploded view of the first component before the second component is combined.

[0033] Figure 7 express Figure 5 Exploded view of the first component in .

[0034] Figure 8 A perspective view showing a second member.

[0035] Fig. 9 Indicates along Figure 4 A partial cross-sectional view of the line segment A1-A2 in FIG.

[0036] Fig.10 A top view showing the coil C disposed on the second member.

[0037] Fig.11 express Fig.10 Enlarged view of part A.

[0038] The reference numerals are as follows:

[0039] 100: Driving mechanism

[0040] 10: First component

[0041] 101: Bottom

[0042] 11: Extension

[0043] 20: Second component

[0044] 201: Connection surface

[0045] 21:Ontology

[0046] 211: Side wall

[0047] 212: Limiting surface

[0048] 22: Boss

[0049] B: Base

[0050] BS: Lower reed

[0051] C: Coil

[0052] d1: first distance

[0053] d2: second distance

[0054] d3: third distance

[0055] FS: Upper reed

[0056] F: Framework

[0057] FS1: Internal connection

[0058] FS2: External connection

[0059] G: Glue

[0060] g: Gap

[0061] H: Shell

[0062] HS: Magnetic field sensing element

[0063] LH: Activities Department

[0064] M: Magnetic components

[0065] O: Optical axis

[0066] P: Circuit components

[0067] P1: Coil

[0068] Q1: Conductive parts

[0069] Q2: Conductive parts

[0070] Q3: Conductive parts

[0071] Q4: Conductive parts

[0072] S1: first side surface

[0073] S2: Second side surface

[0074] W: Elastic element DETAILED DESCRIPTION

[0075] 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.

[0076] 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.

[0077] 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.

[0078] First, please refer to Figures 1 to 3 ,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 An exploded view of the drive mechanism 100 after removing the housing H, Figure 3 express Figure 1 Another exploded view of the driving mechanism 100 after removing the housing H.

[0079] like Figure 1 , Figure 2 and Figure 3 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 focusing (AF) or optical image stabilization (OIS).

[0080] The driving mechanism 100 mainly includes a hollow shell H, an upper spring sheet FS, a frame F, a hollow first component 10, a plurality of long elastic elements W, a hollow second component 20, at least one lower spring sheet BS, a circuit component P and a plastic base B, wherein the circuit component P is fixed on the base B.

[0081] In this embodiment, the housing H has a hollow structure and is combined with the base B, and the circuit assembly F is fixed to the top side of the base B, wherein the housing H and the base B can together constitute a fixed portion of the driving mechanism 100 .

[0082] It should be particularly noted that the first component 10 and the second component 20 are bonded to each other and together form a movable portion LH, wherein the frame F and the movable portion LH are movably disposed in the housing H. In this embodiment, an optical element (not shown) can be installed in the movable portion LH, and the frame F, the movable portion LH and the optical element can be displaced relative to the fixed portion (housing H and base B).

[0083] Through the above-mentioned 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 under the base B to generate a digital image.

[0084] Specifically, the four inner connection parts FS1 of the upper spring sheet FS are bonded and fixed to the top side of the first component 10 of the movable part LH. In addition, the four elastic elements W extend from the outer connection parts FS2 located at the four corners of the upper spring sheet FS and are connected to the four corners of the base B respectively.

[0085] On the other hand, the lower spring BS is the second member 20 connecting the bottom side of the frame F and the movable part LH; in addition, at least one magnetic element M (such as a magnet) is disposed on the frame F, and a coil C is disposed around the second member 20 and corresponds to the magnetic element M. Figure 1 , Figure 3 It can be seen from the figure that magnetic elements M are respectively arranged on the four sides of the frame F of this embodiment.

[0086] As mentioned above, the frame F is connected to the first component 10 located on the top side of the movable part LH and the second component 20 located on the bottom side of the movable part LH through the upper and lower spring sheets FS and BS respectively. In addition, the frame F is further connected to the four corners of the circuit component P and the base B through four elastic elements W (such as thin metal rods). In this way, the movable part LH can not only move up and down relative to the frame F along the optical axis O (Z-axis direction) of the optical element, but the movable part LH and the frame F can also move together along the horizontal direction (X-axis or Y-axis direction) perpendicular to the optical axis O.

[0087] It should be particularly noted that the aforementioned coil C and the magnetic element M can constitute a driving component, wherein 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 movable part 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 functions of autofocus (AF) and / or optical image stabilization (OIS).

[0088] In addition, the aforementioned driving component may further include a coil P1 ( Figure 1 ), wherein when a current signal is applied to the aforementioned coil P1, the magnetic force generated between the coil P1 and the magnetic element M can drive the frame F, the movable part LH and the optical element disposed therein to move together relative to the base B and the shell H in the horizontal direction (X-axis or Y-axis direction) to achieve the function of optical image stabilization (OIS).

[0089] Please also read Figures 4 to 7 ,in Figure 4 A three-dimensional diagram showing the movable part LH, the coil C and the magnetic field sensing element HS after assembly. Figure 5 express Figure 4 The exploded view before the first component 10 and the second component 20 are combined, Figure 6 express Figure 4 Another exploded view of the first component 10 and the second component 20 before being combined, Figure 7 express Figure 5 FIG. 1 is an exploded view of the first component 10 in FIG.

[0090] from Figure 4 to Figure 7 It can be seen that an extension portion 11 protruding toward the base B direction (-Z axis direction) is formed at a corner of the first component 10 of the movable portion LH, wherein a magnetic field sensing element HS (electronic component) is installed and fixed on the outer surface of the aforementioned extension portion 11. In addition, a magnet (not shown) is provided at a corner of the frame F, and the aforementioned magnetic field sensing element HS can be used to sense the position change of the aforementioned magnet.

[0091] For example, the magnetic field sensing element HS may be a Hall effect sensor, a magnetoresistive sensor (MR sensor), or a fluxgate, which may be used to sense the position of a magnet, thereby obtaining information on the relative position change between the movable portion LH and the frame F.

[0092] like Figures 4 to 7 As shown, the magnetic field sensing element HS is disposed on a substrate 12, and a plurality of conductive elements Q1, Q2, Q3, and Q4 are combined in the first component 10 made of plastic material by insert molding, wherein the conductive elements Q1 to Q4 are electrically connected to the substrate 12 and the magnetic field sensing element HS ( Figure 7 ), and the ends of the conductive elements Q1-Q4 are exposed on the top side of the first component 10 and are electrically connected to the upper spring sheet FS. In this way, the electrical signal of the magnetic field sensing element HS can be transmitted to the external circuit through the conductive elements Q1-Q4, the upper spring sheet FS, the elastic element W and the circuit component P in sequence.

[0093] like Figures 4 to 6 As shown, the second component 20 mainly includes a main body 21 and two protrusions 22 extending outward from the main body 21, wherein the protrusions 22 are located on the opposite side of the main body 21 and are used to wind the two ends of the coil C, and the coil C wound on the protrusions 22 can be electrically connected to the lower spring sheet BS by welding.

[0094] In addition, from Figures 4 to 6It can be seen from the figure that when the first and second components 10 and 20 are combined, the body 21 of the second component 20 has a plurality of positioning structures, which are formed on the inner side of the body 21 and extend in the Z-axis direction, so that the body 21 will extend into the interior of the first component 10, and the bottom surface 101 of the first component 10 will be bonded to the connecting surface 201 of the second component 20, wherein the inner diameter of the first component 10 is greater than the inner diameter of the second component 20. In particular, when observed along the horizontal direction (X-axis or Y-axis direction), the magnetic field sensing element HS will overlap with the coil C, and the extension portion 11 of the first component 10 will be located between the coil C and the magnetic field sensing element HS.

[0095] Please also refer to Figure 8 and Fig. 9 ,in Figure 8 A perspective view showing the second member 20, Fig. 9 Indicates along Figure 4 A partial cross-sectional view of the line segment A1-A2 in FIG.

[0096] like Figure 8 and Fig. 9 As shown, the second component 20 in this embodiment is generally in a polygonal structure, and has a first side surface S1 perpendicular to the Y-axis direction, a second side surface S2 perpendicular to the X-axis direction, and a side wall surface 211 connecting the first and second side surfaces S1 and S2. Specifically, the side wall surface 211 is adjacent to the connecting surface 201, and the second component 20 is further formed with a limiting surface 212 adjacent to the side wall surface 211, and the limiting surface 212 can be used to carry and limit the coil C, wherein the side wall surface 211 and the limiting surface 212 are perpendicular to each other, and a groove for accommodating the coil C is formed at the same time.

[0097] In this embodiment, when the coil C, the first component 10 and the second component 20 are assembled, the side wall surface 211 is adjacent to the first component 10 , and the coil C is located between the limiting surface 212 and the first component 10 .

[0098] from Fig. 9 It can be seen that during assembly, glue G can be filled into the groove formed between the limiting surface 212 of the second component 20 and the first component 10 to tightly adhere and fix the coil C, the first component 10 and the second component 20 to each other, wherein the glue G surrounds the coil C.

[0099] It should be particularly noted that the coil C and the limiting surface 212 of the second component 20 are separated by a first distance d1 in the vertical direction, the coil C and the side wall surface 211 of the second component 20 are separated by a second distance d2 in the horizontal direction, and the coil C and the extension portion 11 of the first component 10 are separated by a third distance d3 in the horizontal direction, wherein the first distance d1<second distance d2<third distance d3.

[0100] Please also read Fig.10 and Fig.11 ,in Fig.10 A top view showing the coil C being arranged on the second member 20, Fig.11 express Fig.10 Enlarged view of part A.

[0101] like Fig.10 and Fig.11 As shown, after the coil C is wound around the second component 20, the coil C will be attached to the surfaces of the first and second side surfaces S1 and S2, but a gap g will be formed between the coil C and the side wall surface 211 of the second component 20; that is, the coil C and the side wall surface 211 of the second component 20 will be separated by a distance in the horizontal direction and will not contact each other.

[0102] In summary, the present invention mainly adheres the first component 10 and the second component 20 to each other and together form a movable part LH for carrying an optical element, wherein the conductive parts Q1 to Q4 can be embedded in the first component 10 to conduct electrical signals, and the coil C can be set on the second component 20 to drive the movable part LH to move relative to the fixed part. In this way, not only can the overall size of the driving mechanism 100 be effectively reduced to achieve the purpose of miniaturization of the product, but also the performance and reliability of the driving mechanism 100 can be greatly improved.

[0103] 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.

[0104] 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, characterized in that: include: A movable part, used to connect an optical element, wherein the optical element has an optical axis, and the movable part includes a first member and a second member fixed to each other and hollow; A plurality of conductive members embedded in the first member and exposed on the top side of the first member; a fixed portion, the movable portion being movable relative to the fixed portion; as well as A driving component is used to drive the movable part to move relative to the fixed part, wherein the driving component includes a first driving element, and the first driving element includes a coil surrounding the second component, which 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 driving mechanism further comprises a frame movably connecting the movable part and the fixed part, and the driving assembly further comprises a second driving element arranged on the frame for driving the movable part to move relative to the fixed part.

3. The driving mechanism according to claim 2, characterized in that: The driving mechanism further comprises an upper spring sheet and a plurality of elastic elements, the fixing portion comprises a shell and a base connected to each other, wherein the upper spring sheet is connected to the frame and the first component, and the plurality of elastic elements are connected to the frame and the base.

4. The driving mechanism according to claim 1, characterized in that: The driving mechanism further includes an electronic element disposed on the first component, and when viewed along a horizontal direction, the electronic element and the first driving element overlap each other, wherein the horizontal direction is perpendicular to the optical axis.

5. The driving mechanism according to claim 4, characterized in that: The first component has an extension portion, the electronic component is arranged on the extension portion, and the extension portion is between the first driving component and the electronic component.

6. The driving mechanism according to claim 4, characterized in that: The second component is formed with a first side surface, a second side surface and a side wall connecting the first side surface and the second side surface. The first side surface is perpendicular to the second side surface, and a gap is formed between the coil and the side wall.

7. The driving mechanism according to claim 4, characterized in that: The second component has a body and two protruding columns extending outward from the body, and two ends of the coil are respectively wound around the plurality of protruding columns.

8. The driving mechanism according to claim 7, characterized in that: The body extends into the first component.

9. The driving mechanism according to claim 1, characterized in that: The driving mechanism further comprises a frame and an upper spring sheet, wherein the frame is movably connected to the movable part and the fixed part, and the upper spring sheet is connected to the frame and the first component, wherein the plurality of conductive elements are electrically connected to the upper spring sheet.

10. The driving mechanism according to claim 1, characterized in that: The second component is formed with a connecting surface, a side wall surface and a limiting surface, the connecting surface is located on the top side of the second component and is fixed to a bottom surface of the first component, the side wall surface is adjacent to the limiting surface and the connecting surface, wherein the side wall surface and the limiting surface form a groove for accommodating the first driving element.

11. The driving mechanism according to claim 10, characterized in that: The driving mechanism also includes a glue, and the glue bonds the coil, the first component and the second component, wherein the coil and the limiting surface of the second component are separated by a first distance, and the coil and the side wall surface of the second component are separated by a second distance, and the second distance is different from the first distance.

12. The driving mechanism according to claim 11, characterized in that: The second distance is greater than the first distance.

13. The driving mechanism according to claim 11, characterized in that: The driving mechanism further includes an electronic element, and the first component has an extension portion, the electronic element is arranged on the extension portion, and when viewed along a horizontal direction, the extension portion and the first driving element overlap each other, wherein the horizontal direction is perpendicular to the optical axis.

14. The driving mechanism according to claim 13, characterized in that: A third distance is between the coil and the extension portion, wherein the third distance is different from the first distance and the second distance.

15. The driving mechanism according to claim 14, characterized in that: The third distance is greater than the second distance.

16. The driving mechanism according to claim 13, characterized in that: The electronic component includes a magnetic field sensor.

17. The driving mechanism according to claim 1, characterized in that: The inner diameter of the first component is greater than the inner diameter of the second component.

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