Lens driving module and electronic device

Abstract

The present application provides a lens driving module and an electronic device. The lens driving module includes a base, a shield, a driving mechanism, a space maintaining element and a damping element. The base has an opening. The shield is coupled to the base and has a central opening corresponding to the opening. The driving mechanism is disposed in the shield and is used to drive a lens unit to move along a direction parallel to an optical axis. The space maintaining element is in physical contact with the shield. The space maintaining element includes a plastic frame portion and a metal structure portion. The metal structure portion has a plurality of pins extending toward the base, and the space maintaining element is made by embedding the plastic frame portion and the metal structure portion by injection molding. The damping element is connected to the pins and the lens unit. The pins are closer to the optical axis than the metal structure portion except the pins.

Description

Technical Field

[0001] This invention relates to a lens driving module, and more particularly to a lens driving module suitable for electronic devices. Background Technology

[0002] With advancements in semiconductor technology, the performance of electronic image sensors has improved, allowing for smaller pixel sizes. Therefore, high-quality optical lenses have become an indispensable component. Furthermore, with the rapid development of technology, mobile devices equipped with optical lenses are being used more widely, leading to more diverse requirements for these lenses.

[0003] Existing lens assemblies typically consist of a lens barrel and a lens mount, which are assembled together via threads. Rotation of the lens barrel adjusts its position relative to the lens mount, thereby enabling focusing and projecting the image onto the imaging surface of the image sensor. However, the threaded design increases the overall size of the lens assembly and the complexity of assembly. Furthermore, current commercially available lens assemblies commonly use a voice coil motor (VCM) as the lens drive for autofocus. However, such lens drives typically consist of multiple parts, and to meet the requirements for precision and smoothness during lens movement, multiple alignment and calibration steps are required during the assembly of the lens drive and the lens itself to accurately assemble each component. This limits the production efficiency and manufacturing yield of the lens drive assembly.

[0004] Therefore, how to improve the lens driving device to increase the assembly yield and meet the high specifications required by today's electronic devices has become an important issue in the field of lens driving devices. Summary of the Invention

[0005] In view of the problems mentioned above, the present invention discloses a lens driving module that helps to solve the problems existing in current lens driving devices.

[0006] This invention provides a lens driving module, comprising a base, a shield, a driving mechanism, a space maintaining element, and a damping element. The base has an opening. The shield is coupled to the base, and the shield has a central opening corresponding to the opening of the base. The driving mechanism is disposed within the shield and is used to drive a lens unit to move in a direction parallel to an optical axis. The space maintaining element is in contact with the shield. The space maintaining element is used to maintain a specific distance between the driving mechanism and the central opening of the shield in the direction parallel to the optical axis. The space maintaining element includes a plastic frame portion and a metal structure portion. The metal structure portion has a plurality of pins extending into the base, and the space maintaining element is manufactured by embedding and injection molding the plastic frame portion and the metal structure portion. The damping element connects the pins to the lens unit. The pins are closer to the optical axis than the rest of the metal structure portion.

[0007] The present invention provides an electronic device comprising the aforementioned lens driving module.

[0008] The present invention also provides a lens driving module, comprising a base, a shield, a driving mechanism, and a space maintaining element. The base has an opening. The shield is coupled to the base, and the shield has a central opening corresponding to the opening of the base. The driving mechanism is disposed within the shield and is used to drive a lens unit to move in a direction parallel to an optical axis. The space maintaining element is in contact with the shield and is used to maintain a specific distance between the driving mechanism and the central opening of the shield in the direction parallel to the optical axis. The space maintaining element includes a plastic frame portion and a protrusion structure. The plastic frame portion is in direct contact with the shield, and the protrusion structure extends toward the base. The driving mechanism includes at least one magnet, at least one coil, and a lower elastic element, with the coil and magnet correspondingly disposed. The interaction between the magnet and the coil generates a driving magnetic force to drive the lens unit to move in a direction parallel to the optical axis. One of the magnet and the coil is disposed on the lens unit. The lower elastic element is coupled to the lens unit. The lower elastic element is disposed on the image side of the lens unit and includes an extension that extends away from the optical axis in a direction perpendicular to the optical axis. The protrusion structure of the space-maintaining element is configured correspondingly to the extension of the lower elastic element, and the protrusion structure and the magnet are alternately arranged in a circumferential direction around the optical axis.

[0009] According to the lens drive module and electronic device disclosed in this invention, the space-holding element is manufactured using an embedded injection molding method, which reduces assembly errors between the plastic frame portion and the metal structure portion. The plastic frame portion of the space-holding element has excellent filler manufacturability, and its material properties can be matched with the metal structure portion to improve product design margins. The appropriate rigidity of the metal structure portion, made of suitable materials, reduces the complexity of injection molding. The damping element has a buffering effect, absorbing excessive impact forces, which helps improve the focusing stability of the lens drive module and prevents image shake.

[0010] Furthermore, the protrusion structure of the space-holding element and the extension of the lower elastic element can together form a stop mechanism to limit the range of movement of the drive mechanism along the parallel optical axis. When the protrusion structure and the extension collide, the focusing impact energy can be eliminated, which helps to eliminate the abnormal noise generated when the drive mechanism moves and hits the space-holding element, making the lens drive module operate more quietly.

[0011] The foregoing description of the disclosure and the following description of the embodiments are intended to demonstrate and explain the spirit and principles of the present invention, and to provide a further explanation of the scope of the patent application of the present invention. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 A perspective view of a lens driving module according to a first embodiment of the present invention is shown.

[0014] Figure 2 Draw Figure 1 A top-view schematic diagram of the lens drive module.

[0015] Figure 3 and Figure 4 Draw Figure 1 An exploded view of the electronic device.

[0016] Figure 5 Draw Figure 3 A schematic diagram showing the assembly of some components of the lens drive module.

[0017] Figures 6 to 8 Draw Figure 5 A partially enlarged schematic diagram of the lens drive module.

[0018] Figure 9 and Figure 10 Draw Figure 3 A side view of the space-maintaining element in the lens drive module.

[0019] Figure 11 A schematic diagram of a space-maintaining element in a lens driving module according to a second embodiment of the present invention is shown.

[0020] Figure 12 A schematic diagram of a space-maintaining element in a lens driving module according to a third embodiment of the present invention is shown.

[0021] Figure 13 A schematic diagram of a space-maintaining element in a lens driving module according to a fourth embodiment of the present invention is shown.

[0022] Figure 14 A perspective view of one side of an electronic device according to a fifth embodiment of the present invention is shown.

[0023] Figure 15 A perspective view of one side of an electronic device according to a sixth embodiment of the present invention is shown.

[0024] Figure 16 A perspective view of one side of an electronic device according to a seventh embodiment of the present invention is shown.

[0025] Symbol explanation:

[0026] Electronic devices: E1, E2, E3

[0027] Lens drive module: 1

[0028] Base: 10

[0029] Opening size: 110

[0030] Shielding: 20

[0031] Center opening: 210

[0032] Expansion section: 220

[0033] Drive mechanism: 30

[0034] Magnet: 310

[0035] Coil: 320

[0036] Upper elastic element: 330

[0037] Lower elastic element: 340

[0038] Extension section: 341

[0039] Lens unit: 40

[0040] Groove structure: 410

[0041] Space maintenance elements: 50, 50a, 50b, 50c

[0042] Plastic frame section: 510

[0043] Connection surface: 511

[0044] Step difference surface: 512

[0045] Injection mark: 513

[0046] Metal structural parts: 520

[0047] Pins: 521, 521a, 521b, 521c

[0048] Connecting arm: 522

[0049] Bump structure: 530

[0050] Damping element: 60

[0051] Image capturing devices: 71, 72, 73

[0052] Display device: 80

[0053] Circumferential direction: D

[0054] Optical axis: L

[0055] Hb: Height of the plastic frame section parallel to the optical axis

[0056] Hp: Height of the metal structural part parallel to the optical axis

[0057] Hm: The height of the magnet parallel to the optical axis Detailed Implementation

[0058] The following detailed description of the features and advantages of the present invention in the embodiments is sufficient to enable anyone skilled in the art to understand the technical content of the present invention and implement it accordingly. Based on the disclosure, patent claims, and drawings in this specification, anyone skilled in the art can easily understand the related objectives and advantages of the present invention. The following embodiments further illustrate the points of the present invention in detail, but are not intended to limit the scope of the present invention in any way.

[0059] This invention provides a lens driving module comprising a base, a shield, a driving mechanism, and a space maintaining element. The base has an opening, and the shield is coupled to the base. The shield has a central opening corresponding to the opening in the base. The driving mechanism is disposed within the shield and is used to drive a lens unit to move along a direction parallel to an optical axis. The space maintaining element is in contact with the shield and is used to maintain a specific distance between the driving mechanism and the central opening of the shield in the direction parallel to the optical axis.

[0060] In the lens drive module disclosed in this invention, the space-holding element may include a plastic frame portion and a metal structural portion. The metal structural portion may be a sheet-like, elastically deformable metal material, but this invention is not limited thereto. The metal structural portion has multiple pins extending towards the base; in this case, the space-holding element is manufactured by injection molding the plastic frame portion and the metal structural portion together. In addition to these pins, the metal structural portion also includes one or more other parts (e.g., connecting arms that connect the pins to the plastic frame portion, or a main body portion attached to the surface of the plastic frame portion), and the pins are closer to the optical axis than the other parts. Thus, the space-holding element is manufactured using an injection molding method, which reduces assembly errors between the plastic frame portion and the metal structural portion. Furthermore, the plastic frame portion of the space-holding element has excellent filler manufacturability, and its material properties, compatible with the mold material properties of the metal structural portion, help improve product design margin. Moreover, the appropriate rigidity of the metal structural portion, made of a suitable material (e.g., an iron-containing material), reduces the complexity of injection molding.

[0061] The lens drive module disclosed in this invention may further include a damping element, which is connected to the metal pins of the space-holding element and the lens unit. The metal pins can be of any shape, and when combined with the damping element, they produce an ideal viscosity coefficient. The damping element has a buffering effect, absorbing excessive impact force, which helps improve the focusing stability of the lens drive module and prevents image shake. The damping element can be a high-viscosity damping agent, but this invention is not limited thereto.

[0062] The lens driving module disclosed in this invention includes a driving mechanism comprising at least one magnet, at least one coil, and at least one elastic element. The coil and magnet are correspondingly arranged, and the elastic element is coupled to the lens unit. One of the magnet and the coil is disposed on the lens unit, and the interaction between the magnet and the coil generates a driving magnetic force (referring to the Lorentz force generated by electromagnetic interaction) to drive the lens unit to move along a direction parallel to the optical axis. Thus, the driving mechanism has a suitable spatial configuration to optimize the driving efficiency of the electromagnetic force.

[0063] The drive mechanism may contain two elastic elements. More specifically, the drive mechanism may include an upper elastic element and a lower elastic element disposed opposite to each other. The upper elastic element is disposed on the object side of the lens unit, and the lower elastic element is disposed on the image side of the lens unit. The two elastic elements define the drive stroke range of the drive mechanism.

[0064] The lower elastic element of the drive mechanism may include an extension that extends away from the optical axis in a direction perpendicular to the optical axis. When the extension comes into physical contact with the space-holding element, it helps to buffer impact energy and allows the drive mechanism to reach its maximum actuation range.

[0065] The coil of the drive mechanism and the extension of the lower elastic element can be alternately arranged along a circumferential direction around the optical axis. This improves the space utilization within the lens drive module.

[0066] In the lens drive module disclosed in this invention, the space-maintaining element may further include at least one protrusion structure. The protrusion structure is disposed on the image-side surface of the plastic frame portion, and extends towards the base and is correspondingly configured with respect to the extension of the lower elastic element. The protrusion structure and the extension of the lower elastic element together constitute a stop mechanism for the lens drive module, thereby limiting the range of movement of the drive mechanism along the direction parallel to the optical axis. When the protrusion structure collides with the extension, it can eliminate focusing impact energy. In this way, the protrusion structure reduces the contact area between the extension and the space-maintaining element, helping to eliminate the noise generated when the drive mechanism collides with the space-maintaining element during movement, making the lens drive module operation quieter and improving the delicacy of the lens drive module.

[0067] In the lens driving module disclosed in the present invention, the bump structure of the space maintaining element and the extension portion of the lower elastic element overlap in the direction parallel to the optical axis. Thereby, the space maintaining element can shield the stray light reflected by the lower elastic element, preventing non-imaging light from entering the lens unit.

[0068] In the lens driving module disclosed in the present invention, the plastic frame portion and the bump structure of the space maintaining element can be integrally formed. Thereby, the bump structure is accurately positioned within the lens driving module, reducing the assembly tolerance.

[0069] In the lens driving module disclosed in the present invention, the bump structure of the space maintaining element and the magnet of the driving mechanism can be alternately arranged in the circumferential direction around the optical axis. Thereby, when the driving mechanism moves, any part of the driving mechanism except the lower elastic element can be prevented from hitting the space maintaining element, further improving the effect of the stopper mechanism for eliminating abnormal noise.

[0070] In the lens driving module disclosed in the present invention, the shielding cover can further have an expansion portion, and the expansion portion extends away from the central opening. The lens unit has a groove structure extending toward the base. The groove structure corresponds to the expansion portion, and the expansion portion reveals the groove structure in the object side direction of the lens unit. That is to say, when observing from the object side to the image side of the lens unit, the groove structure can be seen through the expansion portion. Thereby, the steps of additionally installing damping elements can be adjusted according to the process requirements, avoiding waste of unnecessary process resources. When there is a use requirement, a damping element can be arranged in the groove structure and connected to the pins of the space maintaining element, which helps to improve the imaging quality of the lens.

[0071] For the space maintaining element of the lens driving module disclosed in the present invention, the height of the plastic frame portion parallel to the optical axis is Hb, and the height of the metal structure portion parallel to the optical axis is Hp, which can satisfy the following condition: Hp < Hb. Thereby, it is beneficial to the mold design of insert molding.

[0072] For the driving mechanism of the lens driving module disclosed in the present invention, the height of the plastic frame portion in the direction parallel to the optical axis is Hb, and the height of the magnet parallel to the optical axis is Hm, which can satisfy the following condition: 0.7 < Hb / Hm < 1.3. Thereby, it helps to maintain the balance between sufficient magnetic field range of the magnet and controlling the buffering degree of the bump structure.

[0073] For the lens driving module disclosed in the present invention, the plastic frame portion of the space maintaining element can include a connection surface and a step surface. The connection surface is located on the object side surface of the plastic frame portion, and the connection surface is in physical contact and connected to the shielding cover. The step surface is closer to the base than the connection surface, and the metal structure portion within the step surface area is exposed to the air. Thereby, it is beneficial to the geometric configuration of the insert molding die design, reducing the complexity of the plastic molding die design.

[0074] According to the lens driving module disclosed in this invention, the plastic frame portion of the space-maintaining element may have at least one injection mark, and the injection mark is located on a stepped surface. This provides an injection mark accommodating space for the plastic molding process, preventing interference between the injection mark cut and other mechanisms.

[0075] According to the lens drive module disclosed in this invention, the pins of the metal structure of the space-maintaining element can contact the damping element, but not directly contact the lens unit. The ends of the pins of the metal structure can be any polygonal structure. The arbitrary polygonal structure can be planar, spherical, pyramidal, etc., but this invention is not limited thereto. The combination of the pins of the metal structure with the arbitrary polygonal structure design can create different buffering effects.

[0076] The various technical features in the lens driving module of the present invention can be combined and configured to achieve the corresponding effects.

[0077] The electronic device disclosed in this invention may include the aforementioned lens drive module. Utilizing a space-holding element to limit the drive mechanism to an ideal height position parallel to the optical axis helps to more accurately control the focusing performance of the electronic device's lens.

[0078] Based on the above implementation methods, specific embodiments are presented below and described in detail with reference to the accompanying drawings.

[0079] <First Embodiment>

[0080] Please refer to Figures 1 to 4 ,in Figure 1 A perspective schematic diagram of a lens driving module according to a first embodiment of the present invention is shown. Figure 2 Draw Figure 1 A top-view schematic diagram of the lens drive module. Figure 3 and Figure 4 Draw Figure 1 An exploded view of the electronic device. In this embodiment, the lens drive module 1 includes a base 10, a shield 20, a drive mechanism 30, a lens unit 40, a space maintaining element 50, and a damping element 60.

[0081] The base 10 has an opening 110. A shield 20 is coupled to the base 10. The shield 20 has a central opening 210, which corresponds to the opening 110 of the base 10. The shield 20 further has an expansion 220 communicating with the central opening 210, and the expansion 220 extends away from the central opening 210.

[0082] A drive mechanism 30 is disposed within the shielding cover 20 and is used to drive the lens unit 40 to move along the direction parallel to the optical axis L. Specifically, the drive mechanism 30 includes a plurality of magnets 310, a plurality of coils 320, an upper elastic element 330, and a lower elastic element 340. The coils 320 and magnets 310 are correspondingly arranged; specifically, the coils 320 are disposed on the lens unit 40, and the magnets 310 are disposed around the coils 320. The interaction between the magnets 310 and the coils 320 generates a driving magnetic force to drive the lens unit 40 to move along the direction parallel to the optical axis L. The upper elastic element 330 and the lower elastic element 340 are coupled to the lens unit 40. The upper elastic element 330 is disposed on the object side of the lens unit 40, and the lower elastic element 340 is disposed on the image side of the lens unit 40. The upper elastic element 330 and the lower elastic element 340 define the driving stroke range of the drive mechanism 30.

[0083] The space-maintaining element 50 is in physical contact with the shielding cover 20, and the space-maintaining element 50 is used to maintain a specific distance between the drive mechanism 30 and the central opening 210 of the shielding cover 20 in a direction parallel to the optical axis L. Specifically, the space-maintaining element 50 includes a plastic frame portion 510 and a metal structure portion 520. The metal structure portion 520 includes pins 521 extending towards the base 10 and connecting arms 522 connected to the plastic frame portion 510. The pins 521 are closer to the optical axis L than the connecting arms 522, and the ends of the pins 521 are square-column shaped. In this embodiment, the space-maintaining element 50 is manufactured by embedding and injection molding the plastic frame portion 510 and the metal structure portion 520.

[0084] Further reference Figures 5 to 8 ,in Figure 5 Draw Figure 3 A schematic diagram showing the assembly of some components of the lens drive module. Figures 6 to 8 Draw Figure 5 A partially enlarged schematic diagram of the lens drive module. The damping element 60 is connected to the lens unit 40 via pin 521 of the space holding element 50. Specifically, the lens unit 40 has a recessed structure 410 extending towards the base 10. The recessed structure 410 corresponds to the expansion portion 220 of the shield 20, and the expansion portion 220 exposes the recessed structure 410 in the object-side direction of the lens unit 40. (As shown...) Figure 2 As shown, when viewed from the object side to the image side of the lens unit 40, the groove structure 410 and the damping element 60 disposed in the groove structure 410 can be seen through the expansion portion 220. The pin 521 of the space maintaining element 50 contacts the damping element 60, but does not directly contact the lens unit 40.

[0085] The space-holding element 50 further includes a bump structure 530. The bump structure 530 is integrally formed with the plastic frame portion 510 and extends toward the base 10. The lower elastic element 340 of the drive mechanism 30 includes a plurality of extensions 341 that extend away from the optical axis L in a direction perpendicular to the optical axis L, and the extensions 341 are in physical contact with the space-holding element 50. The coils 320 of the drive mechanism 30 and the extensions 341 are alternately arranged in a circumferential direction D around the optical axis L. The bump structure 530 of the space-holding element 50 and the extensions 341 of the drive mechanism 30 are correspondingly configured to form a stop mechanism to limit the range of movement of the drive mechanism 30 in a direction parallel to the optical axis L. Furthermore, the bump structure 530 and the extensions 341 overlap in a direction parallel to the optical axis L, and the bump structure 530 and the magnet 310 are alternately arranged in a circumferential direction D around the optical axis L.

[0086] The plastic frame portion 510 of the space-maintaining element 50 includes a connecting surface 511 and a stepped surface 512. The connecting surface 511 is located on the object-side surface of the plastic frame portion 510 and is in solid contact with and connected to the shielding cover 20. The stepped surface 512 is closer to the base 10 than the connecting surface 511, and the metal structure portion 520 located in the area of ​​the stepped surface 512 is exposed to air. The plastic frame portion 510 of the space-maintaining element 50 also has an injection mark 513, which is located on the stepped surface 512.

[0087] Figure 9 and Figure 10 Draw Figure 3 A side view of the space-maintaining element in the lens drive module. The plastic frame portion 510 of the space-maintaining element 50 has a height of Hb parallel to the optical axis L, and the metal structure portion 520 has a height of Hp parallel to the optical axis L, satisfying the following conditions: Hp = 0.83 mm; and Hb = 1.66 mm.

[0088] The height of the plastic frame 510 parallel to the optical axis L is Hb, and the height of the magnet 310 of the drive mechanism 30 parallel to the optical axis L is Hm, which satisfies the following condition: Hb / Hm=1.17.

[0089] <Second Embodiment>

[0090] Please refer to Figure 11 This is a schematic diagram illustrating a space-maintaining element in a lens driving module according to a second embodiment of the present invention. The space-maintaining element 50a in this embodiment is similar to the space-maintaining element in the first embodiment, except that the metal structure portion of the space-maintaining element 50a includes pins 521a, and the ends of the pins 521a are planar sheets.

[0091] <Third Embodiment>

[0092] Please refer to Figure 12 This is a schematic diagram illustrating a space-maintaining element in a lens driving module according to a third embodiment of the present invention. The space-maintaining element 50b in this embodiment is similar to the space-maintaining element in the first embodiment, except that the metal structure portion of the space-maintaining element 50b includes pins 521b, and the ends of the pins 521b are spherical.

[0093] <Fourth Embodiment>

[0094] Please refer to Figure 13 This is a schematic diagram illustrating a space-maintaining element in a lens driving module according to a fourth embodiment of the present invention. The space-maintaining element 50c in this embodiment is similar to the space-maintaining element in the first embodiment, except that the metal structure portion of the space-maintaining element 50c includes pins 521c, and the ends of the pins 521c are square-pyramidal.

[0095] <Fifth Embodiment>

[0096] Please refer to Figure 14 This is a perspective view illustrating one side of an electronic device according to a fifth embodiment of the present invention. In this embodiment, the electronic device E1 is a smartphone. The electronic device E1 includes an image capturing device 71 and a display device 80, wherein the image capturing device 71 includes the lens driving module (not otherwise specified) described in the first embodiment. The image capturing device 71 and the display device 80 are both disposed on the same side so that the image capturing device 71 can serve as a front-facing camera to provide a selfie function, but the present invention is not limited thereto.

[0097] <Sixth Embodiment>

[0098] Please refer to Figure 15 This is a perspective view illustrating one side of an electronic device according to a sixth embodiment of the present invention. In this embodiment, the electronic device E2 is a smartphone. The electronic device E2 includes an image capturing device 71, an image capturing device 72, an image capturing device 73, and a display device (not otherwise labeled).

[0099] The image capturing devices 71, 72, and 73 in this embodiment have different viewing angles (for example, image capturing device 71 is a telephoto image capturing device, image capturing device 72 is a standard image capturing device, and image capturing device 73 is a wide-angle image capturing device), enabling the electronic device E2 to provide different magnifications to achieve an optical zoom shooting effect. At least one of the image capturing devices 71, 72, and 73 includes the lens driving module (not otherwise labeled) described in the first embodiment and an electronic photosensitive element (not otherwise labeled). The image capturing devices 71, 72, and 73 are disposed on one side of the electronic device E2, while the display device is disposed on the other side of the electronic device E2.

[0100] <Seventh Embodiment>

[0101] Please refer to Figure 16 This is a perspective view illustrating one side of an electronic device according to a seventh embodiment of the present invention. In this embodiment, the electronic device E3 is a smartphone. The electronic device E3 includes image capturing devices 71 and 72 and a display device (not otherwise labeled). The image capturing devices 71 and 72 have different viewing angles (e.g., image capturing device 71 is a wide-angle image capturing device, and image capturing device 72 is a standard image capturing device), enabling the electronic device E3 to provide different magnifications to achieve an optical zoom shooting effect. At least one of the image capturing devices 71 and 72 includes the lens driving module (not otherwise labeled) described in the first embodiment and an electronic photosensitive element (not otherwise labeled). The image capturing devices 71 and 72 are disposed on one side of the electronic device E3, while the display device is disposed on the other side of the electronic device E3.

[0102] The lens driving module disclosed in this invention is not limited to applications in smartphones. It can also be applied to mobile focusing systems as needed, offering both excellent aberration correction and good image quality. For example, the lens driving module can be widely used in electronic devices such as 3D image capture, digital cameras, mobile devices, digital tablets, smart TVs, network monitoring equipment, dashcams, reversing cameras, multi-lens devices, recognition systems, motion-sensing game consoles, and wearable devices. The aforementioned electronic devices are merely illustrative examples of practical applications of this invention and do not limit the scope of application of the image capturing device.

Claims

1. A lens driving module, characterized by, The utility model relates to a lens drive mechanism, comprising: a base having an opening; a shield coupled to the base, the shield having a central opening corresponding to the opening of the base; a drive mechanism disposed within the shield, the drive mechanism configured to drive a lens unit along a direction parallel to an optical axis; a space maintaining element in physical contact with the shield, the space maintaining element configured to maintain a certain distance between the drive mechanism and the central opening of the shield along a direction parallel to the optical axis, the space maintaining element comprising: a plastic frame portion, the plastic frame portion comprising: a connecting surface on an object side surface of the plastic frame portion, the connecting surface in physical contact with and connected to the shield; a step surface closer to the base than the connecting surface; and at least one injection mark on the step surface; and a metal structure portion having a plurality of pins, the space maintaining element being made by insert injection molding of the plastic frame portion and the metal structure portion, the pins extending toward the base, and the metal structure portion within the region of the step surface being exposed to air; and a damping element connected to the pins and the lens unit; wherein the pins are closer to the optical axis than the metal structure portion other than the pins. The drive mechanism comprises:

2. The lens driving module according to claim 1, wherein at least one magnet; at least one coil corresponding to the at least one magnet, the at least one magnet and the at least one coil interacting to generate a driving magnetic force configured to drive the lens unit along a direction parallel to the optical axis, one of the at least one magnet and the at least one coil being disposed on the lens unit; and at least one elastic element coupled to the lens unit. The number of the at least one elastic element is two, the two elastic elements being an upper elastic element and a lower elastic element respectively, the upper elastic element being disposed on an object side of the lens unit, the lower elastic element being disposed on an image side of the lens unit, and the lower elastic element and the upper elastic element being oppositely disposed.

3. The lens driving module according to claim 2, wherein The lower elastic element comprises an extension portion extending away from the optical axis along a direction perpendicular to the optical axis.

4. The lens driving module according to claim 3, wherein The at least one coil and the extension portion are alternately disposed along a circumferential direction around the optical axis.

5. The lens driving module according to claim 4, wherein The space maintaining element further comprises at least one bump structure disposed on an image side surface of the plastic frame portion, and the at least one bump structure extends toward the base and is correspondingly arranged with the extension portion of the lower elastic element to limit a movement range of the drive mechanism along a direction parallel to the optical axis.

6. The lens driving module according to claim 4, wherein The at least one bump structure and the extension portion of the lower elastic element overlap along the direction parallel to the optical axis.

7. The lens driving module according to claim 6, wherein The plastic frame portion and the at least one bump structure are integrally formed.

8. The lens driving module according to claim 7, wherein The shield further has an expansion portion extending away from the central opening, the lens unit has a groove structure extending toward the base, the groove structure and the expansion portion correspond to each other, and the expansion portion exposes the groove structure in an object side direction of the lens unit.

9. The lens driving module according to claim 1, wherein The damping element is disposed in the groove structure.

10. The lens driving module according to claim 9, wherein ​ 11. The lens driving module according to claim 1, wherein The height of the plastic frame portion in the direction parallel to the optical axis is Hb, and the height of the metal structure portion in the direction parallel to the optical axis is Hp, which satisfy the following condition: Hp < Hb.

12. The lens driving module according to claim 11, wherein The driving mechanism includes at least one magnet, the height of the plastic frame portion in the direction parallel to the optical axis is Hb, and the height of the at least one magnet in the direction parallel to the optical axis is Hm, which satisfy the following condition: 0.7 < Hb / Hm < 1.

3.

13. An electronic device comprising the lens driving module according to claim 1.

14. A lens driving module, characterized by, Comprise: a base having an opening; a shield coupled to the base, the shield having a central opening corresponding to the opening of the base; a driving mechanism disposed in the shield, the driving mechanism being configured to drive a lens unit to move in a direction parallel to an optical axis; a space maintaining element in physical contact with the shield, the space maintaining element being configured to maintain a certain distance between the driving mechanism and the central opening of the shield in the direction parallel to the optical axis, the space maintaining element comprising: a plastic frame portion in direct contact with the shield, the plastic frame portion comprising: a connecting surface on an object side surface of the plastic frame portion, the connecting surface being in physical contact with and connected to the shield; a step surface closer to the base than the connecting surface; and at least one injection mark on the step surface; a metal structure portion having a plurality of pins, and the metal structure portion and the plastic frame portion being made by insert injection molding, and the metal structure portion in the region of the step surface being exposed to air; and a bump structure extending toward the base; and a damping element connected to the pins and the lens unit; wherein the driving mechanism comprises: at least one magnet; at least one coil disposed corresponding to the at least one magnet, the at least one magnet and the at least one coil interacting to generate a driving magnetic force to drive the lens unit to move in the direction parallel to the optical axis, and one of the at least one magnet and the at least one coil being disposed on the lens unit; and a lower elastic element coupled to the lens unit, the lower elastic element being disposed on an image side of the lens unit and comprising an extension portion extending away from the optical axis in a direction perpendicular to the optical axis; wherein the bump structure of the space maintaining element and the extension portion of the lower elastic element are correspondingly arranged, and the bump structure and the at least one magnet are alternately disposed in a circumferential direction around the optical axis.

15. The lens driving module according to claim 14, wherein The bump structure and the extension portion constitute a stop mechanism of the lens driving module, the stop mechanism being configured to limit the movement range of the driving mechanism in the direction parallel to the optical axis.

16. The lens driving module according to claim 14, wherein The coil and the extension portion are alternately disposed in the circumferential direction around the optical axis.

Images