Linear motor and electronic device

Abstract

The utility model belongs to the technical field of tactile feedback, and particularly relates to a linear motor and electronic equipment. The linear motor comprises a shell, a stator assembly and a vibrator assembly, the stator assembly comprises a coil, the coil is fixedly arranged in a containing space, the vibrator assembly comprises a magnetic part and two first magnet yokes which are arranged in the containing space respectively, the magnetic part is arranged on the inner side of the coil, the magnetic part and the coil are arranged at intervals, and the two first magnet yokes are arranged in the containing space. The two first magnet yokes are respectively fixed at two ends of the magnetic piece along the vibration direction of the vibrator assembly, the two first magnet yokes are respectively and elastically connected with the shell, and one side, facing the magnetic piece, of each first magnet yoke is provided with a concave cavity. By using the linear motor in the technical scheme, the risk of overflowing from the connecting body between the magnetic piece and the first magnet yoke and generating interference with the coil is reduced, and the vibration effect of the linear motor is further ensured.

Description

Technical Field

[0001] This utility model belongs to the field of tactile feedback technology, specifically relating to a linear motor and electronic device. Background Technology

[0002] To meet consumer demand, electronic products are becoming increasingly lightweight, which places higher demands on their core components. With the development and application of haptic feedback mechanisms in electronic products, linear motors, as the actuators for haptic feedback, are widely used in mobile phones and other electronic devices due to their fast response and excellent vibration feedback. However, in existing linear motors, adhesive overflow can occur when bonding the magnetic components to the yoke. This overflowing adhesive may interfere with the stator assembly, thus affecting the vibration performance of the linear motor. Utility Model Content

[0003] The purpose of this invention is to at least solve the problem of adhesive overflow during the connection of existing magnetic yokes and magnetic components, which leads to poor vibration performance of linear motors. This objective is achieved through the following technical solution:

[0004] The first aspect of this utility model provides a linear motor, comprising:

[0005] The shell has a storage space;

[0006] A stator assembly, including a coil, the coil being fixed within the receiving space;

[0007] The oscillator assembly includes a magnetic component and two first magnetic yokes respectively disposed in the accommodating space. The magnetic component is disposed inside the coil and spaced apart from the coil. The two first magnetic yokes are respectively fixed to both ends of the magnetic component along the vibration direction of the oscillator assembly. The two first magnetic yokes are elastically connected to the housing respectively. Each first magnetic yoke has a cavity on the side facing the magnetic component.

[0008] By using the linear motor in this technical solution, the accommodating space can accommodate the stator assembly and the oscillator assembly. Two first magnetic yokes are fixed to both ends of the magnetic component along the vibration direction of the oscillator assembly. The cavity is used to accommodate the connecting part (which can be a colloid) during connection, reducing the risk of colloid overflowing from between the magnetic component and the first magnetic yoke and interfering with the coil, thereby ensuring the vibration effect of the linear motor. In addition, the coil can generate a magnetic field when energized and interact with the magnetic component. Since the first magnetic yoke is elastically connected to the housing, the oscillator assembly can vibrate along the vibration direction.

[0009] In addition, the linear motor according to this utility model may also have the following additional technical features:

[0010] In some embodiments of this utility model, the oscillator assembly further includes a second magnetic yoke located between the housing and the coil, wherein the two ends of the second magnetic yoke along the vibration direction are respectively connected to the two first magnetic yokes.

[0011] In some embodiments of this utility model, the second magnetic yoke has an opening in the circumferential direction, the stator assembly further includes a bracket, the coil is disposed on the bracket, and a portion of the bracket protrudes from the opening and is connected to the housing.

[0012] In some embodiments of this utility model, the two ends of the second magnetic yoke along the vibration direction are respectively welded to the two first magnetic yokes.

[0013] In some embodiments of this utility model, there are two second magnetic yokes, and the two second magnetic yokes together enclose a space to accommodate the magnetic component.

[0014] In some embodiments of this utility model, along the direction from the first magnetic yoke to the magnetic element, the cavity is located within the magnetic element in the orthogonal projection of the magnetic element.

[0015] In some embodiments of this utility model, the cavity is filled with a mass, or the cavity is filled with adhesive.

[0016] In some embodiments of this utility model, the housing includes a top cover, a bottom cover, and a connecting shell. The bottom cover and the top cover are respectively connected to opposite ends of the connecting shell along the axial direction of the magnetic component, and the bottom cover, the top cover, and the connecting shell enclose the receiving space.

[0017] In some embodiments of this utility model, the oscillator assembly further includes two spring pieces, one of which is sandwiched between the bottom shell and the connecting shell and connected to the first magnetic yoke near the bottom shell, and the other of which is sandwiched between the top cover and the connecting shell and connected to the first magnetic yoke near the top cover.

[0018] The second aspect of this invention provides an electronic device having the aforementioned linear motor. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0020] Figure 1An exploded view of the linear motor according to an embodiment of the present invention is shown schematically.

[0021] Figure 2 for Figure 1 Schematic diagram of the structure of the intermediate oscillator assembly;

[0022] Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure of the middle stator assembly;

[0023] Figure 4 for Figure 1 A partial structural diagram of a linear motor;

[0024] Figure 5 for Figure 1 A cross-sectional schematic diagram of a linear motor.

[0025] The labels in the attached diagram are as follows:

[0026] 100. Linear motor;

[0027] 11. Top cover; 111. Bottom plate; 112. Side plate; 12. Bottom shell; 13. Connecting shell;

[0028] 21. Coil; 22. Bracket; 221. First connecting part; 222. Second connecting part; 223. Support part;

[0029] 31. Magnetic component; 32. First magnetic yoke; 321. Cavity; 33. Second magnetic yoke; 34. Spring piece;

[0030] 40. FPCB. Detailed Implementation

[0031] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0032] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0033] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0034] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.

[0035] To meet consumer demand, electronic products are becoming increasingly lightweight, which places higher demands on their core components. With the development and application of haptic feedback mechanisms in electronic products, linear motors, as the actuators for haptic feedback, are widely used in mobile phones and other electronic devices due to their fast response and excellent vibration feedback. However, in existing linear motors, adhesive overflow can occur when bonding the magnetic components to the yoke. This overflowing adhesive may interfere with the stator assembly, thus affecting the vibration performance of the linear motor.

[0036] Figure 1 An exploded view of the linear motor 100 according to an embodiment of the present invention is shown schematically. Figure 5 for Figure 1 A cross-sectional structural diagram of the linear motor 100. (See diagram below.) Figure 1 and 5 As shown, this utility model proposes a linear motor 100 and an electronic device. The linear motor 100 of this utility model includes a housing, a stator assembly, and an oscillator assembly. The housing has a receiving space. The stator assembly includes a coil 21, which is fixed in the receiving space. The oscillator assembly includes a magnetic element 31 and two first magnetic yokes 32 respectively disposed in the receiving space. The magnetic element 31 is disposed inside the coil 21 and spaced apart from the coil 21. Along the vibration direction of the oscillator assembly, the two first magnetic yokes 32 are respectively glued to both ends of the magnetic element 31. The two first magnetic yokes 32 are elastically connected to the housing. Each first magnetic yoke 32 has a cavity 321 on the side facing the magnetic element 31.

[0037] By using the linear motor 100 in this technical solution, the accommodating space can accommodate the stator assembly and the oscillator assembly. The magnetic element 31 of the oscillator assembly is fixed to the first magnetic yoke 32 at both ends along the vibration direction of the oscillator assembly. The cavity 321 of the first magnetic yoke 32 can accommodate part of the connecting body (which can be a colloid) during connection, reducing the risk of colloid overflow from between the magnetic element 31 and the first magnetic yoke 32 and interfering with the coil 21, thereby ensuring the vibration effect of the linear motor 100. In addition, the coil 21 can generate a magnetic field when energized and interact with the magnetic element 31. Since the first magnetic yoke 32 is elastically connected to the housing, the oscillator assembly can vibrate along the vibration direction.

[0038] Specifically, in this embodiment, when the magnetic component 31 and the first magnetic yoke 32 are bonded together, adhesive needs to be applied between the first magnetic yoke 32 and the magnetic component 31 first, and then the first magnetic yoke 32 and the magnetic component 31 are squeezed together to make the connection between the magnetic component 31 and the first magnetic yoke 32 more stable. However, during the squeezing process, the adhesive may overflow from the outside of the magnetic component 31, and may cause adhesion to the coil 21 on the outside of the magnetic component 31, thereby affecting the vibration effect of the oscillator assembly. The cavity 321 in this embodiment can accommodate part of the adhesive, preventing overflow caused by applying too much adhesive and improving reliability.

[0039] In some embodiments of this invention, the oscillator assembly further includes a second magnetic yoke 33 located between the housing and the coil 21. The two ends of the second magnetic yoke 33 along the vibration direction are connected to two first magnetic yokes 32. There are two second magnetic yokes 33, which together enclose a space to accommodate the magnetic element 31. In this embodiment, the magnetic element 31 is cylindrical, and the two second magnetic yokes 33 are disposed on opposite sides of the magnetic element 31 along its radial direction. Both second magnetic yokes 33 are magnetically conductive, capable of guiding the magnetic field lines of the internally energized coil 21 and the magnetic element 31, thereby improving the magnetic field utilization rate of the coil 21 and the magnetic element 31.

[0040] Specifically, in this embodiment, a first magnetic yoke 32 is bonded to each end of the magnetic component 31. The first magnetic yoke 32 is then welded to two second magnetic yokes 33 at opposite ends along the axial direction of the magnetic component 31 to form a magnetic yoke cavity that encloses the magnetic component 31 and limits magnetic leakage. The first magnetic yoke 32 is connected to the spring piece 34.

[0041] Specifically, in this embodiment, the second magnetic yoke 33 can be set to one or two. In this embodiment, it is preferred to set to two, as it is more convenient to install two second magnetic yokes 33.

[0042] In some embodiments of this utility model, such as Figure 4 As shown, the second magnetic yoke 33 has an opening in its circumferential direction. The stator assembly also includes a bracket 22, and the coil 21 is disposed on the bracket 22. Part of the bracket 22 protrudes from the opening and is connected to the housing. In this embodiment, there are two openings between the two second magnetic yokes 33 along the circumferential direction of the magnetic component 31, one is a first opening and the other is a second opening. The first opening and the second opening are arranged along the radial direction of the magnetic component 31.

[0043] Specifically, in this embodiment, the bracket 22 includes a support portion 223, a first connecting portion 221, and a second connecting portion 222. The first connecting portion 221 and the second connecting portion 222 are respectively connected to opposite sides of the support portion 223. A coil 21 is connected to the support portion 223. The first connecting portion 221 extends out of the first opening and is connected to the housing. The second connecting portion 222 extends out of the second opening and is connected to the housing. By using two connecting portions, the stable and secure performance of the coil 21 can be achieved, thus improving reliability.

[0044] In some embodiments of this invention, the two ends of the second magnetic yoke 33 along the vibration direction are welded to the two first magnetic yokes 32 respectively. In this embodiment, welding melts and fuses the metal materials together through heat conduction, thereby forming a larger contact area on the joint surface. This connection method has better robustness and shock resistance, and can withstand heavy loads, vibrations, or temperature changes without loosening. The welded connection can significantly enhance the structural strength and stability between the first magnetic yoke 32 and the second magnetic yoke 33.

[0045] In some embodiments of this invention, along the direction from the first magnetic yoke 32 to the magnetic element 31, the orthographic projection of the cavity 321 onto the magnetic element 31 is located within the magnetic element 31. In this embodiment, the above arrangement enables the first magnetic yoke 32 and the magnetic element 31 to have planar bonding surfaces and their areas, thereby ensuring the bonding reliability between the magnetic element 31 and the first magnetic yoke 32. If the projected area of ​​the cavity 321 toward the magnetic element 31 is equal to the area of ​​one side of the magnetic element 31 toward the first magnetic yoke 32, then one side of the colloid is connected to the magnetic element 31, while the other side of the colloid is completely located within the cavity 321 and will not be completely connected to the inner surface of the cavity 321. This would reduce the connection reliability between the magnetic element 31 and the first magnetic yoke 32.

[0046] Specifically, in this embodiment, if the end of the magnetic component 31 facing the first magnetic yoke 32 is located in the cavity 321, since the inner surface of the cavity 321 is a curved structure and the side of the magnetic component 31 facing the first magnetic yoke 32 is a planar structure, the colloid is connected to the curved structure and the planar structure respectively, which will reduce the stability of the bonding and is not as stable as the bonding of the two planar structures mentioned above.

[0047] In some embodiments of this invention, the cavity 321 is filled with a mass, or the cavity 321 is filled with adhesive. In this embodiment, the cavity 321 may be filled with a mass, thereby increasing the overall mass of the oscillator assembly. When the energized coil 21 drives the oscillator assembly to vibrate along the vibration direction, the reciprocating motion of the oscillator assembly with the mass can produce a stronger vibration effect, enabling the linear motor 100 to provide clear and distinct tactile feedback.

[0048] Specifically, in this embodiment, when the mass of the oscillator assembly is insufficient, the cavity 321 can be filled with colloid or other materials that do not affect performance, or even the cavity 321 can be filled into a solid cavity, all of which can increase the mass of the oscillator assembly and improve the vibration of the linear motor 100.

[0049] In some embodiments of this utility model, such as Figure 2 and 3As shown, the housing includes a top cover 11, a bottom shell 12, and a connecting shell 13. The bottom shell 12 and the top cover 11 are respectively connected to opposite ends of the connecting shell 13 along the axis of the magnetic component 31, and the bottom shell 12, the top cover 11, and the connecting shell 13 enclose a receiving space. In this embodiment, the housing includes a top cover 11, a bottom shell 12, and a connecting shell 13. The inner cavity of the connecting shell 13 has a first opening and a second opening arranged opposite to each other. The top cover 11 covers the first opening, and the bottom shell 12 covers the second opening. The housing adopts a split design, which facilitates the disassembly and assembly of the stator assembly and the oscillator assembly within the receiving space of the housing, improving the efficiency of disassembly and assembly.

[0050] In some embodiments of this utility model, such as Figure 4 and 5 As shown, the oscillator assembly also includes two spring plates 34. One of the spring plates 34 is sandwiched between the bottom shell 12 and the connecting shell 13 and is connected to the first magnetic yoke 32 near the bottom shell 12. The other spring plate 34 is sandwiched between the top cover 11 and the connecting shell 13 and is connected to the first magnetic yoke 32 near the top cover 11. In this embodiment, the outer peripheral edge of the spring plate 34 is connected to the shell, and the inner peripheral edge of the spring plate 34 is connected to the first magnetic yoke 32. When the linear motor 100 is working, the electromagnetic force of the energized coil 21 will generate a driving force on the magnetic component 31 and the first magnetic yoke 32, causing the magnetic component 31 and the first magnetic yoke 32 to vibrate and experience impact forces. As an elastic element, the spring plate 34 can effectively absorb and mitigate these vibrations and impact forces, thereby providing stable thrust and providing a shock absorption effect. This function ensures the stable operation of the linear motor 100 and improves its performance and lifespan.

[0051] In some embodiments of this utility model, such as Figure 4 and 5 As shown, both the top cover 11 and the bottom shell 12 include a bottom plate portion 111 and a side plate portion 112. The side plate portion 112 surrounds and connects to the outer peripheral edge of the bottom plate portion 111, and the side of the side plate portion 112 facing away from the bottom plate portion 111 is connected to the connecting shell 13. In this embodiment, one of the two spring pieces 34 is sandwiched between the side plate portion 112 of the top cover 11 and the connecting shell 13, and the other of the two spring pieces 34 is sandwiched between the side plate portion 112 of the bottom shell 12 and the connecting shell 13. Because the side plate portion 112 has a certain height, this height can provide vibration amount along the vibration direction, ensuring that the spring piece 34 can have a certain vibration amount in the vibration direction. The vibration direction is parallel to the axial direction of the magnetic element 31.

[0052] Specifically, in this embodiment, the vibration amount of the spring 34 along the vibration direction is equal to or less than the height of the side plate portion 112, thus ensuring the effective vibration of the spring 34 in the vibration direction.

[0053] Specifically, in this embodiment, such as Figure 1 As shown, there are two connecting shells 13, which are connected along the vibration direction. The bottom shell 12 and the top cover 11 are respectively connected to the opposite ends of the two connecting shells 13 along the vibration direction.

[0054] Furthermore, in this embodiment, such as Figure 1 As shown, an FPCB40 (Flexible Printed Circuit Board) is provided on the base plate 111. One end of the FPCB40 is electrically connected to an external power supply, and the other end of the FPCB40 is electrically connected to the coil 21.

[0055] Specifically, in this embodiment, the coil 21 is bonded to the bracket 22 as a whole and welded to the connecting shell 13. Then, the bottom shell 12 is welded and the FPCB40 is pasted to form a stator assembly.

[0056] Furthermore, in this embodiment, the linear motor 100 operates as follows: after the coil 21 is energized, it interacts with the magnetic field generated by the magnetic circuit of the oscillator assembly, causing the oscillator assembly to move along the vibration direction. When the driving electrical signal is an alternating signal, the oscillator assembly is subjected to alternating force, generating vibration. The linear motor 100 in this embodiment optimizes the magnetic circuit structure of the oscillator assembly, and the design of the cavity 321 of the first magnetic yoke 32 can change the application scenario according to the product performance.

[0057] Furthermore, when the mass of the oscillator assembly in this invention is sufficient, the cavity 321 can store the overflowing adhesive. This reduces adhesive overflow and increases the bonding strength between the first magnetic yoke 32 and the magnetic component 31, improving the reliability of the product during drops and preventing the possibility of the magnetic component 31 detaching from the first magnetic yoke 32. When the mass of the oscillator assembly is insufficient, the cavity 321 can be filled with adhesive or other materials that do not affect performance, increasing the mass of the oscillator assembly and improving the vibration feel.

[0058] This invention also proposes an electronic device having the aforementioned linear motor 100.

[0059] By using the linear motor 100 of the electronic device in this technical solution, the accommodating space can accommodate the stator assembly and the oscillator assembly. The magnetic element 31 of the oscillator assembly is glued to the first magnetic yoke 32 at both ends along its own axis. The cavity 321 of the first magnetic yoke 32 can accommodate part of the glue during the gluing process, reducing the risk of glue overflowing from the magnetic element 31 and the first magnetic yoke 32 and interfering with the coil 21, thereby ensuring the vibration effect of the linear motor 100. In addition, the coil 21 can generate a magnetic field when energized and interact with the magnetic element 31. Since the first magnetic yoke 32 is elastically connected to the housing, the oscillator assembly can vibrate along the vibration direction.

[0060] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A linear motor characterized by, include: The shell has a storage space; A stator assembly, including a coil, the coil being fixed within the receiving space; The oscillator assembly includes a magnetic component and two first magnetic yokes respectively disposed in the accommodating space. The magnetic component is disposed inside the coil and spaced apart from the coil. The two first magnetic yokes are respectively fixed to both ends of the magnetic component along the vibration direction of the oscillator assembly. The two first magnetic yokes are elastically connected to the housing respectively. Each first magnetic yoke has a cavity on the side facing the magnetic component.

2. The linear motor according to claim 1, characterized by The oscillator assembly also includes a second magnetic yoke located between the housing and the coil, with the two ends of the second magnetic yoke connected to the two first magnetic yokes respectively along the vibration direction.

3. The linear motor according to claim 2, characterized in that The second magnetic yoke has an opening in the circumferential direction. The stator assembly also includes a bracket, the coil is disposed on the bracket, and part of the bracket protrudes from the opening and is connected to the housing.

4. The linear motor according to claim 2, characterized by The two ends of the second magnetic yoke along the vibration direction are respectively welded to the two first magnetic yokes.

5. The linear motor according to claim 2, characterized by There are two second magnetic yokes, and the two second magnetic yokes together enclose a space to accommodate the magnetic component.

6. The linear motor according to any one of claims 1 to 5, characterized in that, Along the direction from the first yoke to the magnetic element, the cavity is located within the magnetic element in the orthogonal projection of the magnetic element.

7. The linear motor according to any one of claims 1 to 5, characterized by The cavity is filled with a mass, or the cavity is filled with adhesive.

8. The linear motor according to any one of claims 1 to 5, characterized by The housing includes a top cover, a bottom cover, and a connecting shell. The bottom cover and the top cover are respectively connected to opposite ends of the connecting shell along the axis of the magnetic component, and the bottom cover, the top cover, and the connecting shell enclose the receiving space.

9. The linear motor according to claim 8, characterized in that The oscillator assembly further includes two spring plates. One of the spring plates is sandwiched between the bottom shell and the connecting shell and is connected to the first magnetic yoke near the bottom shell. The other of the spring plates is sandwiched between the top cover and the connecting shell and is connected to the first magnetic yoke near the top cover.

10. An electronic device, comprising: The linear motor has any one of claims 1-9.

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