Voice coil motor, lens module and electronic device

Abstract

A voice coil motor includes a base and a magnet which are relatively fixed, a bearing, a magnetic piece and a coil; the bearing is movably connected with the base, the magnet generates a first magnetic field to attract the magnetic piece so as to relatively fix the bearing and the base; wherein the coil generates a second magnetic field during energization, the magnetic field direction of the second magnetic field is opposite to the magnetic field direction of the first magnetic field, the second magnetic field and the first magnetic field interact to reduce or eliminate the attraction of the magnet to the magnetic piece, so as to relatively separate the bearing and the base. The application further provides a lens module and an electronic device.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, and in particular to a voice coil motor, a lens module, and an electronic device. Background Technology

[0002] Please see Figure 1 A voice coil motor 100' typically includes a housing 80', a magnet 20', a coil 50', and a support member 30'. The magnet 20' is fixed to the housing 80', and the coil 50' is fixed to the support member 30', with the magnet 20' surrounding the coil 50'. The support member 30' is movably connected to the housing 80' and also serves to fix the lens 210', enabling the voice coil motor 100' to perform the focusing function of the lens 210'. When the voice coil motor 100' is not in use, the movable connection between the support member 30' and the housing 80' allows the components fixed to the support member 30' to move relative to the components fixed to the housing 80', potentially causing collisions and damage to the components. Summary of the Invention

[0003] A voice coil motor includes a base, a magnet, a carrier, a magnetic component, and a coil; the magnet is fixed relative to the base; the carrier is movably connected to the base; the magnet generates a first magnetic field to attract the magnetic component, thereby fixing the carrier relative to the base; the coil is fixed relative to the carrier and the magnetic component; wherein, during energization, the coil generates a second magnetic field, the direction of which is opposite to the direction of the first magnetic field, and the second magnetic field interacts with the first magnetic field to reduce or eliminate the attraction of the magnet on the magnetic component, thereby separating the carrier from the base.

[0004] In one possible implementation, the magnetic element is disposed on the surface of the carrier facing the magnet.

[0005] In one possible implementation, the voice coil motor further includes an upper spring and a lower spring, the upper spring and the lower spring being fixed on opposite sides of the carrier, and both the upper spring and the lower spring being fixed on the base, the carrier and the base being elastically connected through the upper spring and the lower spring.

[0006] In one possible implementation, the base includes a base plate and a support column, the support column being fixed to the surface of the base plate, the lower spring plate being fixed to the base plate, and the upper spring plate being fixed to the support column.

[0007] In one possible implementation, the base is provided with a groove, and at least a portion of the magnet is accommodated in the groove.

[0008] In one possible implementation, the carrier includes an outer surface with a receiving groove provided thereon, in which at least a portion of the coil is received.

[0009] In one possible implementation, the carrier further includes an inner surface disposed opposite to the outer surface, the inner surface being provided with threads.

[0010] In one possible implementation, the voice coil motor further includes a housing that covers the base.

[0011] A lens module, the lens module including a voice coil motor.

[0012] An electronic device comprising a lens module.

[0013] The voice coil motor provided in this application, when the voice coil motor is de-energized, uses a magnet to attract a magnetic component, thereby fixing the carrier component to the base. When the voice coil motor is energized, the coil generates a second magnetic field that repels the magnet, allowing the carrier component to separate relative to the base, thus realizing the focusing function of the voice coil motor. Specifically, a magnet is fixedly mounted on the base of the carrier component. The magnet both attracts the magnetic component and generates a first magnetic field, causing the coil to move within the first magnetic field and generate the second magnetic field. Furthermore, the magnet is positioned on one side of the coil, replacing the related art's technique of surrounding the coil with a magnet, reducing the area of ​​the plane containing the coil and thus reducing the overall size of the voice coil motor. The magnetic component is attracted by the magnet, thus fixing the carrier component to the base, and also enhances the magnetic field strength of the second magnetic field generated by the coil.

[0014] The voice coil motor provided in this application, when the voice coil motor is de-energized, uses a magnet to attract a magnetic component, thereby fixing the carrier component to the base and reducing or eliminating the possibility of collisions between adjacent components in the voice coil motor. When the voice coil motor is energized, the coil generates a second magnetic field that repels the magnet, allowing the carrier component to separate relative to the base, thus realizing the focusing function of the voice coil motor. Specifically, a magnet is fixedly mounted on the carrier component base. The magnet not only attracts the magnetic component but also generates a first magnetic field, causing the coil to move within the first magnetic field and generate the second magnetic field. Furthermore, the magnet is positioned on one side of the coil, replacing the related art's technique of surrounding the coil with a magnet, reducing the area of ​​the plane containing the coil and thus reducing the overall size of the voice coil motor. The magnetic component is attracted by the magnet, thus fixing the carrier component to the base, and also enhances the magnetic field strength of the second magnetic field generated by the coil. Attached Figure Description

[0015] Figure 1 This is a cross-sectional schematic diagram of a voice coil motor provided in related technologies.

[0016] Figure 2 The electronic device provided in this application embodiment is a mobile phone.

[0017] Figure 3 This is a schematic diagram of the lens module provided in an embodiment of this application.

[0018] Figure 4 This is a schematic diagram of the structure of a voice coil motor provided in an embodiment of this application.

[0019] Figure 5 for Figure 4 The diagram shown is an exploded view of a voice coil motor.

[0020] Figure 6 This is a schematic diagram of the cross-sectional structure of a voice coil motor when it is powered off.

[0021] Figure 7 This is a schematic diagram of the cross-sectional structure of a voice coil motor when it is energized.

[0022] Figure 8 A schematic diagram of the cross-sectional structure when the current to the voice coil motor is cut off.

[0023] Explanation of main component symbols

[0024]

[0025] Detailed Implementation

[0026] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. Many specific details are set forth in the following description to provide a thorough understanding of this application; the described embodiments are merely some, not all, of the embodiments described in this application.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes all and any combination of one or more of the associated listed items.

[0028] In the various embodiments of this application, for ease of description and not limitation, the term "connection" used in the patent application specification and claims is not limited to physical or mechanical connections, whether direct or indirect. Terms such as "upper," "lower," "above," "below," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship also changes accordingly.

[0029] Please see Figure 2 This application provides an electronic device 300, which is a product that can be applied to a lens module 200, including but not limited to mobile phones, wearable devices, cameras, drones, doorbells, car cameras, etc. In this embodiment, the electronic device 300 is a mobile phone.

[0030] Please see Figure 3 This application embodiment also provides a lens module 200, which includes a voice coil motor 100 and a lens 210, wherein the lens 210 is retractably housed in the voice coil motor 100.

[0031] Please see Figure 4 This application provides a voice coil motor 100, which may include a base 10, a magnet 20, a carrier 30, a magnetic component 40, and a coil 50. The magnet 20 is fixed relative to the base 10; the coil 50, the magnetic component 40, and the carrier 30 are fixed relative to each other. When the voice coil motor 100 is de-energized, the magnet 20 generates a first magnetic field to attract the magnetic component 40, thereby fixing the carrier 30 relative to the base 10. When the voice coil motor 100 is energized, current flows through the coil 50, generating a second magnetic field. The direction of the second magnetic field is opposite to that of the first magnetic field. The superposition of the second and first magnetic fields reduces or cancels the attraction of the magnet 20 on the magnetic component 40, allowing the carrier 30 to separate relative to the base 10.

[0032] Please refer to the following: Figure 5 The base 10 includes a base plate 11 and a plurality of support columns 13. The base plate 11 includes a support surface 111, and the plurality of support columns 13 are fixedly disposed on the support surface 111. In this embodiment, the base plate 11 is a square plate, and the number of support columns 13 is four, located at the four corners of the base plate 11. The base plate 11 is also provided with a first through hole 113, which penetrates through two opposite surfaces of the base plate 11, providing space for the movement of the lens 210.

[0033] The base 10 also includes a groove 115, which is recessed from the support surface 111 toward the direction away from the support column 13. The groove 115 surrounds the first through hole 113 and communicates with the first through hole 113, that is, the groove 115 is annular.

[0034] The magnet 20 is fixed to the base 10. The magnet 20 is ring-shaped, and at least a portion of the magnet 20 is accommodated in the groove 115, thereby reducing the overall thickness of the voice coil motor 100.

[0035] The support member 30 is generally hollow and annular, and a second through hole 31 is provided on the support member 30. The support member 30 includes an inner surface 33 and an outer surface 35 disposed opposite to the inner surface 33, and the inner surface 33 surrounds and forms the second through hole 31.

[0036] The inner surface 33 is provided with a thread 331, which is used to engage with the lens 210, thereby fixing the lens 210 to the carrier 30. The outer surface 35 is provided with a receiving groove 351, which is used to receive the coil 50.

[0037] The magnetic component 40 is fixed to the support component 30. The magnetic component 40 contains magnetic elements, such as iron, cobalt, nickel, or their alloys. The magnet 20 generates a first magnetic field that attracts the magnetic component 40, thereby fixing the base 10 and the support component 30 relatively. In this embodiment, the magnetic component 40 is an iron block, fixed to the support component 30 and facing the magnet 20. Reducing the distance between the magnet 20 and the iron block reduces the force exerted by the magnet 20 to attract the iron block, thus reducing the magnetic field strength of the first magnetic field and its influence on the coil 50. It is understood that the magnetic component 40 can also be fixed at other locations on the support component 30.

[0038] At least a portion of the coil 50 is housed in the receiving groove 351 and fixed to the carrier 30. During the energization of the voice coil motor 100, the coil 50 moves in the first magnetic field, causing the coil 50 to generate a second magnetic field. The magnetic field direction of the first magnetic field is opposite to that of the second magnetic field, thereby reducing or eliminating the force exerted by the magnet 20 on the magnetic component 40, and thus allowing the carrier 30 to be separated from the base 10.

[0039] Furthermore, the magnetic element 40 is located in the second magnetic field, and the magnetic element 40 also has the function of enhancing the magnetic field strength of the second magnetic field generated by the coil 50. The magnetic element 40 can also be arranged around the support member 30 and disposed inside the annular coil 50, which can further enhance the magnetic field strength of the second magnetic field.

[0040] The voice coil motor 100 further includes an upper spring plate 60 and a lower spring plate 70, which are located on opposite sides of the support member 30. The upper spring plate 60 is located on the side of the support member 30 facing away from the base plate 11 and can be fixed to four support columns 13 by adhesive (not shown). The upper spring plate 60 is also fixed to the surface of the support member 30 facing away from the base plate 11. The lower spring plate 70 is located on the surface of the support member 30 facing the base plate 11 and is fixed to the support surface 111. The lower spring plate 70 is also fixed to the surface of the support member 30 facing the base plate 11. Both the upper spring plate 60 and the lower spring plate 70 have a certain degree of elasticity, allowing the support member 30 to move relative to the base 10. The upper spring plate 60 and the lower spring plate 70 provide support and elastic recovery for the movement of the support member 30.

[0041] When the upper spring 60 and the lower spring 70 do not deform, there is a certain gap between the magnetic component 40 and the magnet 20; when the magnetic component 40 attracts the magnet 20, causing the carrier 30 to be fixed relative to the base 10, the upper spring 60 and the lower spring 70 deform to a certain extent; when the magnetic field strength of the second magnetic field generated by the coil 50 is greater than the magnetic field strength of the first magnetic field and the magnetic field direction is opposite, the carrier 30 moves in the direction away from the base plate 11, and the upper spring 60 and the lower spring 70 deform.

[0042] Please see Figure 6 to Figure 8 The following uses specific states to illustrate the interaction between the various components.

[0043] Please see Figure 6 When the voice coil motor 100 is de-energized, the magnet 20 generates a first magnetic field that attracts the magnetic component 40. Since the magnet 20 is relatively fixed to the base 10, and the magnetic component 40 is relatively fixed to the support component 30, the base 10, magnet 20, support component 30, and magnetic component 40 are all in a relatively fixed state. At this time, both the upper spring 60 and the lower spring 70 deform downwards.

[0044] Please see Figure 7 When coil 50 is energized, it moves within the first magnetic field to generate a second magnetic field. The direction of the second magnetic field is opposite to that of the first magnetic field. Coil 50 repels magnet 20, reducing or canceling the attraction of magnet 20 on magnetic component 40. When the strength of the second magnetic field is greater than that of the first magnetic field, the support component 30 moves away from the base plate 11, enabling the voice coil motor 100 to focus. At this time, both the upper spring 60 and the lower spring 70 deform upwards.

[0045] Please see Figure 8 When the current to the voice coil motor 100 is cut off, no current flows through the coil 50, the second magnetic field disappears, and the carrier 30 moves toward the base plate 11 under the elastic restoring force of the upper spring 60 and the lower spring 70, driving the magnetic component 40 to move toward the base plate 11 in sync. At the same time, the magnet 20 attracts the magnetic component 40, further causing the magnetic component 40 to move toward the base plate 11, thereby fixing the carrier 30 and the base 10 together.

[0046] Please refer to it again. Figure 4 and Figure 5 The lens module 200 also includes a housing 80, which includes a top plate 81 and four side plates 83 surrounding the top plate 81. The housing 80 covers the base 10. The side plates 83 are connected to the bottom plate 11 on the surface away from the top plate 81. The housing 80 and the base 10 form a receiving space for accommodating the base 10, magnet 20, carrier 30, magnetic component 40, and coil 50, etc.

[0047] The base 10 further includes a protrusion 117 disposed on the surface where the base plate 11 connects to the housing 80; the housing 80 further includes a recess 831 disposed on the surface where the side plate 83 connects to the base 10. The protrusion 117 is accommodated in the recess 831, and the recess 831 and the protrusion 117 are adapted to each other, facilitating the assembly of the housing 80 and the base 10, and preventing the housing 80 and the base 10 from shifting.

[0048] It is understood that in some embodiments, the protrusion 117 can be provided on the housing 80 and the recess 831 can be provided on the base 10; in other embodiments, both the base 10 and the housing 80 can be provided with the protrusion 117 and the recess 831 at the same time, as long as the above functions can be achieved.

[0049] The voice coil motor 100 provided in this application, when the voice coil motor 100 is de-energized, the magnet 20 attracts the magnetic component 40, thereby fixing the carrier component 30 to the base 10, reducing or eliminating the possibility of collision between adjacent components in the voice coil motor 100; when the voice coil motor 100 is energized, the coil 50 generates a second magnetic field that repels the magnet 20, allowing the carrier component 30 to separate relative to the base 10, thereby realizing the focusing function of the voice coil motor 100. In this design, a magnet 20 is fixedly mounted on the base 10 of the support member 30. The magnet 20 not only attracts the magnetic member 40, but also generates a first magnetic field, causing the coil 50 to move in the first magnetic field and thus generate a second magnetic field. In addition, the magnet 20 is located on one side of the coil 50, replacing the technical solution in the related art where the magnet 20' is surrounded by the coil 50', reducing the area of ​​the plane where the coil 50 is located, thereby reducing the overall volume of the voice coil motor 100. The magnetic member 40 is attracted by the magnet 20 to fix the support member 30 to the base 10, and at the same time, it enhances the magnetic field strength of the second magnetic field generated by the coil 50.

[0050] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A voice coil motor, characterized in that, include: Base; The magnet is fixed relative to the base; The support member is movably connected to the base; A magnetic component, wherein the magnet generates a first magnetic field to attract the magnetic component, thereby fixing the carrier component relative to the base; The coil is fixed relative to the carrier and the magnetic component, and the magnetic component is also used to enhance the magnetic field strength of the second magnetic field generated by the coil. Scrap metal; and The upper and lower springs are fixed to opposite sides of the support member, and both the upper and lower springs are also fixed to the base. The support member and the base are elastically connected through the upper and lower springs. The coil generates a second magnetic field during the energization process. The direction of the second magnetic field is opposite to that of the first magnetic field. The second magnetic field interacts with the first magnetic field to reduce or eliminate the attraction of the magnet on the magnetic component, so that the carrier component is separated from the base.

2. The voice coil motor according to claim 1, characterized in that, The magnetic component is disposed on the surface of the carrier facing the magnet.

3. The voice coil motor according to claim 1, characterized in that, The base includes a base plate and a support column. The support column is fixed to the surface of the base plate, the lower spring is fixed to the base plate, and the upper spring is fixed to the support column.

4. The voice coil motor according to claim 3, characterized in that, The base is provided with a groove, and at least a portion of the magnet is accommodated in the groove.

5. The voice coil motor according to claim 1, characterized in that, The carrier includes an outer surface, on which a receiving groove is provided, and at least a portion of the coil is received in the receiving groove.

6. The voice coil motor according to claim 5, characterized in that, The carrier also includes an inner surface opposite to the outer surface, and the inner surface is provided with threads.

7. The voice coil motor according to claim 1, characterized in that, The voice coil motor also includes a housing that covers the base.

8. A lens module, characterized in that, The lens module includes the voice coil motor as described in any one of claims 1-7.

9. An electronic device, characterized in that, The electronic device includes the lens module as described in claim 8.

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