Vibration motor and electronic equipment

Abstract

A vibration motor and an electronic device, the vibration motor can be applied to a mobile phone, a PAD and other electronic devices, a local area of a first side wall of a shell of the vibration motor protrudes outwards to form a concave cavity with an opening facing a movable part, and a driving coil is partially or completely located in the concave cavity. According to the vibration motor, the height of the driving coil protruding out of the opening of the cavity can be reduced as much as possible, so that the design space of the movable part is increased to a certain extent, the size of the movable part can be increased, the weight of the movable part is increased, the vibration effect is improved, and the vibration motor is more compact in structure and convenient to use. The thickness of the electronic equipment is reduced, and the light and thin design requirement of the electronic equipment is met.

Description

Vibration motor and electronic equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on August 26, 2022, with application number 202211031713.5 and invention name “A Vibration Motor and Electronic Device”, the entire contents of which are incorporated by reference in the embodiments of this application. Technical Field

[0002] The present application relates to the field of electronic products, and in particular to a vibration motor and electronic equipment. Background Art

[0003] Vibration motors, which use electromagnetic force to convert electrical energy into mechanical vibrations, have become an essential component in mobile phones and other electronic devices. They are used in key modules such as incoming call alerts and alarm notifications. They can also provide tactile vibration feedback in conjunction with other applications.

[0004] As electronic devices continue to increase in functionality, the space reserved for vibration motors is becoming increasingly limited. In particular, new electronic devices often have to further reduce the layout space for vibration motors in order to ensure certain important functions.

[0005] Therefore, how to make the structure of electronic equipment as compact as possible while achieving good vibration effects and vibration experience has been a technical problem faced by technicians in this field for a long time.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a vibration motor and an electronic device with a compact structure and a strong vibration sense.

[0008] The first aspect of the present application provides a vibration motor, including a housing, an inner cavity of the housing is provided with a drive coil and a movable part, the drive coil is used to drive the movable part to reciprocate relative to the housing to generate vibration: the first side wall of the housing has a protrusion protruding toward the side away from the movable part, the protrusion forms a cavity with an opening toward the movable part, and the drive coil is at least partially located in the cavity. Usually, the vibration motor is fixed to the housing of the electronic device through a bracket. In order to increase the thickness of the electronic device, the outer wall of the protrusion is located inside the bracket as much as possible or the outer wall of the protrusion is flush with the outer wall of the bracket. The shape of the protrusion can be cylindrical, of course, it can also be other shapes, depending on the specific product.

[0009] In the present application, a local area of ​​the first side wall of the housing of the vibration motor protrudes outward to form a concave cavity with an opening facing the movable part, and the driving coil is partially or completely located in the concave cavity. While achieving the same electromagnetic force, the vibration motor in the present application can minimize the height of the driving coil protruding from the opening of the concave cavity. This increases the design space of the movable part to a certain extent, increases the volume of the movable part, and thus increases the weight of the movable part, improves the vibration effect, and enhances the user's vibration experience. In addition, the structure of the vibration motor is more compact, which is conducive to reducing the thickness of the electronic device and meeting the requirements of lightweight and thin design of electronic equipment.

[0010] Based on the first aspect, the present application example further provides a first embodiment of the first aspect: elastic components are disposed between the two opposing side walls of the movable component and the inner wall of its corresponding side housing. The elastic components can be different types of springs, such as cylindrical springs, C-shaped springs, V-shaped springs, W-shaped springs, etc. When an alternating current is passed through the drive coil, the movable component alternately compresses the elastic components on both sides and reciprocates relative to the housing, causing the elastic components to vibrate at a high frequency and generate vibration. The movable component can be supported by the first side wall, or alternatively, it can be suspended relative to the first side wall.

[0011] Based on the first embodiment of the first aspect, the present application example also provides a second implementation method of the first aspect: it also includes a circuit board, the circuit board includes a first part located in the inner cavity and a second part located outside the inner cavity, the second part is provided with a first connection end and a second connection end, the driving coil is opposite to the first part, and the two ends of the driving coil are electrically connected to the first connection end and the second connection end. The circuit board can be a flexible circuit board, including an insulating substrate and a wire arranged on the substrate, and the insulating substrate can have a predetermined flexibility. The first connection end and the second connection end can be arranged on the same side of the circuit board, and of course, can also be arranged on both sides of the circuit board. The first connection end and the second connection end can be a solder pad structure or a gold finger form. The two ends of the driving coil can be electrically connected to the first connection end and the second connection end respectively through the wire arranged on the substrate. Of course, the driving coil can also be directly connected to the first connection end or the second connection end.

[0012] In this application, the connection between the driving coil and the external power supply circuit is achieved by arranging corresponding wires on the circuit board, which is simple and easy, and the circuit board occupies a small space, which is conducive to reducing the thickness of the vibration motor and thus reducing the thickness of the electronic device.

[0013] Based on the second embodiment of the first aspect, the example of this application also provides a third embodiment of the first aspect: the driving coil includes a cylindrical coil and a planar coil, the planar coil is arranged in the first part and is wound one circle at a time in the plane of the circuit board along a predetermined direction, the planar coil and the cylindrical coil are connected in series and have the same current rotation direction. This example arranges wiring on the circuit board to form a planar coil, and connects the planar coil and the conventional cylindrical coil in series to form a driving coil with the same current rotation direction. When energized, the planar coil and the cylindrical coil jointly generate an alternating magnetic field, which increases the electromagnetic field strength of the driving coil to a certain extent, can drive heavier moving parts, and improve the vibration performance of the vibration motor.

[0014] Based on the third embodiment of the first aspect, this example also provides a fourth embodiment of the first aspect: the planar coil includes a first planar coil and a second planar coil connected in series and having the same current rotation direction, the first planar coil being located on a first side of the circuit board facing the movable component, and the second planar coil being located on a second side of the circuit board facing away from the movable component. This example fully utilizes the space on both sides of the circuit board, arranging the first planar coil and the second planar coil on each side, further increasing the electromagnetic field strength generated by the drive coil and thereby improving vibration performance.

[0015] Based on the fourth embodiment of the first aspect, the example of this application also provides a fifth embodiment of the first aspect: the cylindrical coil includes a first cylindrical coil and a second cylindrical coil, the first cylindrical coil is located on the first side, and the second cylindrical coil is located on the second side; the first cylindrical coil, the first planar coil, the second planar coil, and the second cylindrical coil are electrically connected end to end in sequence, and the free end of the first cylindrical coil and the free end of the second cylindrical coil are electrically connected to the first connection end and the second connection end, respectively. The structures of the first cylindrical coil and the second cylindrical coil can be exactly the same or different. The size and shape of the first cylindrical coil and the second cylindrical coil can be reasonably set according to the specific product. In this embodiment, cylindrical coils are set on both sides of the circuit board, which can make full use of the space. On the basis of taking into account the compact structure, the electromagnetic field force generated by the drive coil is maximized to improve the vibration performance of the vibration motor.

[0016] Based on the fifth embodiment of the first aspect, this example further provides a sixth embodiment of the first aspect: the first cylindrical coil, the first planar coil, the second planar coil, and the second cylindrical coil are coaxially arranged. The coaxial arrangement of the coils facilitates the formation of an electromagnetic field with a relatively high magnetic field concentration capability.

[0017] Based on the fifth or sixth implementation of the first aspect, the present application also provides a seventh implementation of the first aspect: at least a portion of the edge region of the second side surface of the first portion is supported at the opening of the cavity, and the second cylindrical coil is completely located within the cavity. In this implementation, the circuit board is directly supported by the first side wall, eliminating the need for a third component, minimizing the thickness dimension of the vibration motor. The circuit board can be secured to the first side wall by bonding or other means.

[0018] Based on the fifth to seventh embodiments of the first aspect, this application example further provides an eighth embodiment of the first aspect: the first cylindrical coil and the second cylindrical coil are fixed to the circuit board via a bonding process. In this embodiment, each cylindrical coil is fixed to the circuit board via a bonding process, which is simple and easy to implement.

[0019] Based on the fifth to seventh embodiments of the first aspect, the present application example also provides a ninth embodiment of the first aspect: the inner hole of at least one of the first cylindrical coil and the second cylindrical coil is further provided with a magnetic core component. The magnetic core component can be an iron core or other related materials, such as soft magnetic material, ferrite core, Sendust core, etc. The magnetic core component can improve the magnetic focusing performance of the driving coil to a certain extent, further enhance the electric field force generated by the power supply, and thus improve the vibration performance.

[0020] Based on the ninth embodiment of the first aspect, the present application example further provides a tenth embodiment of the first aspect: the distance between the magnetic core component and the movable component is greater than the distance between the first cylindrical coil and the movable component. In other words, the magnetic core component is relatively farther from the movable component than the first cylindrical coil, thereby reducing the effect of the magnetic field generated by the magnet on the movable component on the magnetic core component.

[0021] Based on the ninth or tenth implementation of the first aspect, the example of the present application further provides an eleventh implementation of the first aspect: the circuit board has a through hole, the through hole passes through the inner circle area of ​​the first planar coil and the second planar coil, and the magnetic core component passes through the through hole. The magnetic core component is partially located in the inner circle of the first planar coil and the second planar coil, which can further have a magnetic focusing effect on the magnetic field generated by energizing the first planar coil and the second planar coil on the circuit board, thereby improving the overall performance of the drive coil and enhancing the vibration sense of the vibration motor.

[0022] Based on the eleventh embodiment of the first aspect, the example of the present application also provides a twelfth embodiment of the first aspect: the magnetic core component includes a first magnetic core portion, a second magnetic core portion, and a third magnetic core portion, the first magnetic core portion is located in the inner hole of the first cylindrical coil and matches the inner hole of the first cylindrical coil, the second magnetic core portion is located in the inner hole of the second cylindrical coil and matches the inner hole of the second cylindrical coil, and the third magnetic core portion matches the through hole. In this embodiment, each magnetic core portion roughly matches the inner hole of the corresponding coil, that is, the outer contour of the cross section of each magnetic core portion is basically the same as the inner hole of the corresponding coil, which can improve the magnetic concentration capacity to a certain extent.

[0023] Based on the twelfth embodiment of the first aspect, the example of the present application also provides the thirteenth embodiment of the first aspect: the first magnetic core portion, the second magnetic core portion and the third magnetic core portion are an integrated structure or a split structure. The first magnetic core portion, the second magnetic core portion and the third magnetic core portion are a split structure, the processing technology is relatively simple, and it is easy to install. The first magnetic core portion can be integrally formed with the first cylindrical coil, the second magnetic core portion can be integrally formed with the second cylindrical coil, and the third magnetic core portion can be integrally formed with the circuit board. Of course, the first magnetic core, the second magnetic core portion and the third magnetic core portion can also be an integrated structure to reduce the number of parts of the vibration motor.

[0024] Based on the fifth to thirteenth embodiments of the first aspect, the present application example further provides a fourteenth embodiment of the first aspect: a groove is provided at a position opposite the movable component and the second cylindrical coil, and the second cylindrical coil partially extends into the groove. While maximizing the weight of the movable component, by providing a groove below the movable component, the number of turns of the drive coil can be maximized, thereby increasing the electromagnetic driving force and, in turn, enhancing the vibration sensation.

[0025] Based on the second to fourteenth embodiments of the first aspect, this application example further provides a fifteenth embodiment of the first aspect: the first sidewall has an extension, the extension is located outside the inner cavity, and the second portion is supported by the extension. The shape of the extension can be substantially the same as the shape of the second portion of the circuit board, and of course, it can be larger or smaller than the second portion. That is, the projection of the second portion on the extension can be completely located inside the extension, or partially extend beyond the extension, as long as it can provide support for the second portion.

[0026] Based on the first to fifteenth embodiments, the example of this application also provides a sixteenth embodiment of the first aspect: the movable component includes a mass block and at least one magnet installed on the mass block, and the elastic component is installed between the mass block and the housing.

[0027] Based on the second to sixteenth embodiments of the first aspect, the present application example further provides a seventeenth embodiment of the first aspect: the circuit board is a flexible circuit board. The flexible circuit board is thin, highly flexible, can be bent and folded freely, and has relatively high layout flexibility.

[0028] In a second aspect, the present application further provides an electronic device comprising any of the above-mentioned vibration motors, wherein the vibration motor is fixed to the electronic device via a bracket, and along the protruding direction of the protrusion, the outer wall of the protrusion does not exceed the outer wall of the bracket.

[0029] Based on the second aspect, this application example further provides a first embodiment of the second aspect: the first side wall includes a fixedly connected support wall and a raised portion, the support wall is fixedly attached to the bracket, the bracket has a clearance space, and the raised portion is located in the clearance space. The support wall is fixedly attached to the bracket, and the support area is relatively large, which helps to improve the reliability of the vibration motor.

[0030] Based on the first embodiment of the second aspect, this application example further provides a second embodiment of the second aspect: the avoidance space includes a through hole. The through hole processing process is relatively simple.

[0031] Based on the second embodiment of the second aspect, this application example further provides a third embodiment of the second aspect: a predetermined gap is provided between the raised portion and the inner wall of the through hole. This prevents the raised portion from colliding with the bracket when the vibration motor vibrates, thereby avoiding noise and improving the quality of the electronic device.

[0032] Based on the first to third embodiments of the second aspect, this example also provides a fourth embodiment of the second aspect: the support wall and the bracket are fixed via an adhesive layer. The adhesive layer can be structural adhesive, double-sided tape, or adhesive-backed adhesive. This fixing method is simple, reliable, and takes up little space.

[0033] Based on the second aspect to the fourth implementation of the second aspect, the example of this application also provides a fifth implementation of the second aspect: the bracket is a middle plate of a middle frame assembly of an electronic device or a PCB of an electronic device.

[0034] The electronic device of the present application includes the above-mentioned vibration motor, so the electronic device also has the above-mentioned technical effects of the vibration motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG1 is a front view of an electronic device provided in an example of the present application;

[0036] FIG2 is a schematic diagram of the main components of the electronic device shown in FIG1 with the back cover hidden;

[0037] FIG3 is a schematic cross-sectional view of FIG2 along the AA line;

[0038] FIG4 is a schematic diagram of a vibration motor in a first direction in an example of the present application;

[0039] FIG5 is a schematic cross-sectional view taken along line BB of the vibration motor shown in FIG4 ;

[0040] FIG6 is an exploded schematic diagram of the vibration motor shown in FIG4 ;

[0041] FIG7 is an enlarged schematic diagram of point C in FIG5 ;

[0042] FIG8 is a schematic diagram of the vibration motor shown in FIG4 in a second direction;

[0043] FIG9 is a front view of the vibration motor shown in FIG4 with part of the housing hidden;

[0044] FIG10 is a cross-sectional view of the first side wall, the drive coil, and the circuit board assembly of the vibration motor shown in FIG4 ;

[0045] FIG11 is a schematic diagram of a first side surface of a circuit board in the vibration motor shown in FIG4 ;

[0046] FIG12 is a schematic diagram of a second side surface of the circuit board in the vibration motor shown in FIG4 ;

[0047] FIG13 is a three-dimensional schematic diagram of the cover of the vibration motor in FIG4 ;

[0048] FIG14 is a schematic diagram of a first side wall of the vibration motor shown in FIG4 ;

[0049] FIG15 is a schematic diagram of the assembly of the mass block and the elastic component in the vibration motor shown in FIG4 ;

[0050] FIG16 is a schematic diagram of a partial structure of a vibration motor in a second example of the present application;

[0051] FIG17 is a schematic diagram of a partial structure of a vibration motor in the third example of the present application. DETAILED DESCRIPTION

[0052] Regarding the vibration motor mentioned in the background technology, this application has conducted a lot of research on its installation in electronic equipment. The research found that the current vibration motor is mainly supported inside the shell of the electronic equipment through a mounting bracket. The interior of the vibration motor includes a mass block and a drive coil arranged upper and lower. After the vibration motor is installed in the electronic equipment through the mounting bracket, the overall installation height is roughly equal to the sum of the heights of the mass block, the drive coil and the mounting bracket. Although technical personnel in this field have set minimum limit values ​​for the heights of the mass block, the drive coil and the mounting bracket, considering the vibration effect and good vibration experience conditions, the height reduction of the vibration motor after installation is also very limited.

[0053] Based on the above research findings, this application proposes a unique technical solution that can further reduce the installation height of the drive motor.

[0054] In the description of this application, it should be noted that in the embodiments of this application, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of the features.

[0055] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the two are connected to each other and the relative position relationship remains unchanged after the connection. "Rotational connection" means that the two are connected to each other and can rotate relative to each other after the connection. "Sliding connection" means that the two are connected to each other and can slide relative to each other after the connection.

[0056] The directional terms mentioned in the embodiments of this application, such as "inside" and "outside", are only used to refer to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer description and understanding of the embodiments of this application, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the embodiments of this application. In addition, unless otherwise specified in this application, the "plurality" mentioned in this application refers to two or more.

[0057] In the description of the embodiments of the present application, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0058] In the embodiments of this application, "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0059] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0060] The middle frame provided in the embodiments of the present application can be applied to electronic devices, where the electronic devices can be mobile terminals such as mobile phones, tablet computers, tablet computer accessories, wearable devices, vehicle-mounted devices, augmented reality (AR) / virtual reality (VR) devices, laptop computers, ultra-mobile personal computers (UMPCs), netbooks, personal digital assistants (PDAs), etc., or professional shooting equipment such as digital cameras, SLR cameras / micro-single-lens reflex cameras, action cameras, gimbal cameras, drones, etc. The embodiments of the present application do not impose any special restrictions on the specific form of the electronic device. For ease of understanding, the following description takes the electronic device as an example of a mobile phone.

[0061] Please refer to FIG1 , which is a front view of an electronic device provided in an embodiment of the present application.

[0062] The electronic device 100 provided in the embodiment of the present application includes a display screen 102 and a shell assembly 101. The main functions of the shell assembly 101 are two-fold. On the one hand, it provides a mounting base for the various components of the electronic device 100, and on the other hand, it provides protection for some components. A receiving cavity may be formed inside the shell assembly 101, and various components of the electronic device 100 may be arranged inside the receiving cavity. The material of the shell assembly 101 is not limited here. In specific practice, those skilled in the art can choose according to actual needs; for example, it can be made of metal, plastic, ceramic or glass.

[0063] Please refer to FIG2 , which is a schematic structural diagram of the housing of the electronic device shown in FIG1 with the rear cover removed, and only major components are shown in the figure.

[0064] Specifically, the components installed inside the housing assembly 101 may include a mainboard 104, a battery module, a wireless communication module, a camera module, an audio playback module, etc. The arrangement and installation method of these components are not specifically limited in this application. It should be understood by those skilled in the art that the electronic device may include one or more of the components listed above, and of course may also include but are not limited to the components listed above, and may also include other components.

[0065] Please refer to FIG3 , which is a cross-sectional view taken along line AA in FIG2 .

[0066] The present application provides a vibration motor, which can be used to generate vibration prompts, which can be used for incoming call vibration prompts, and can also be used for touch vibration feedback. For example, acting on different application modules (such as camera modules, audio playback modules, display screens, etc.), different vibration feedback effects can correspond. For example, the vibration motor applied to the camera module can play an anti-shake effect in shooting. Figure 3 shows a specific example of a vibration motor set close to the speaker 103, and the vibration of the vibration motor can be applied to the speaker 103. The vibration motor can also correspond to different vibration feedback effects for touch operations acting on different areas of the display screen. Different application scenarios (for example: time reminders, receiving information, alarm clocks, games, etc.) can also correspond to different vibration feedback effects. The touch vibration feedback effect can also support customization.

[0067] Referring to Figure 3 , vibration motor 106 is secured to the housing assembly of the electronic device via bracket 105 . In one example, bracket 105 can be secured to the mid-plate of the housing assembly. Bracket 105 can also be a printed circuit board (PCB) or other component of the electronic device capable of stably supporting the vibration motor. Vibration motor 106 can be secured to bracket 105 via adhesive layer 107 , which can be structural adhesive, double-sided tape, or adhesive tape.

[0068] Please refer to Figures 4 to 6, Figure 4 is a schematic diagram of a first direction of a vibration motor in an example of the present application; Figure 5 is a BB cross-sectional schematic diagram of the vibration motor shown in Figure 4; Figure 6 is an exploded schematic diagram of the vibration motor shown in Figure 4.

[0069] 5, 6 and 7, the vibration motor 106 of the present application includes important components such as a housing 1, a driving coil 3, a movable component 5 and an elastic component 6. The vibration motor 106 of the present application can be used as a linear vibration motor.

[0070] Please refer to FIG. 5 . The housing 1 of the present application has an inner cavity 1 a . The driving coil 3 , the movable component 5 and the elastic component 6 are all installed in the inner cavity 1 a of the housing 1 .

[0071] The shell 1 mainly plays a role in protecting the components located inside it. The shell 1 can be made of relatively high-strength metal materials. Of course, under the premise of meeting the use requirements, the shell 1 can also be made of other materials. The shape of the shell 1 can be roughly rectangular, roughly including six side walls. In order to describe the simplicity of the technical solution, this article defines the six side walls of the shell 1 as: the first side wall 12, the second side wall 111, the third side wall 112, the fourth side wall 113, the fifth side wall 114 and the sixth side wall (unnumbered), wherein the second side wall to the sixth side wall form a cover body 11, and the cover body 11 has an inner cavity 1a with an open lower end. The first side wall 12 is installed at the opening position of the cover body 11 as the bottom wall.

[0072] [Corrected on 28.06.2023 according to Rule 91] The elastic component 6 generates vibration when it is compressed or stretched at high frequency. The elastic component 6 can be a spring, such as a cylindrical spring, a C-type spring, a V-type spring, a W-type spring, etc., among which Figures 15 and 16 show examples of the spring being a V-type spring, and Figure 17 shows an example of the spring being a C-type spring. Of course, the form of the elastic component 6 is not limited to the spring form described in this article, and it can also be other elastic components 6 with elasticity.

[0073] The elastic component 6 is usually installed on the two opposite side walls of the movable component 5. As shown in Figures 5 and 6, the left and right walls of the movable component 5 are both installed with elastic components 6. Please refer to Figure 5 for the left and right directions. This article defines the two sides of the vibration motor 106 along the length direction as the left and right sides. The elastic component 6 can be fixedly connected to the movable component 5 by other means such as bonding or welding. The other end of the elastic component 6 is in contact with the corresponding side wall of the outer shell 1 of the vibration motor 106. Please refer to Figure 9. Elastic components 6 are provided between the second side wall 111 of the outer shell 1 and the left side wall of the movable component 5, and between the third side wall 112 and the right side wall of the movable component 5. The elastic component 6 on the left side can be in contact with the second side wall 111, and the elastic component 6 on the right side can be in contact with the third side wall 112. The other end of the elastic component 6 can be fixedly connected to the outer shell 1 by bonding or welding.

[0074] When the driving coil 3 in the present application is energized, it can drive the movable part 5 to reciprocate relative to the housing 1 to generate vibration. In the initial state, the movable part 5 is located in the middle position between the second side wall 111 and the third side wall 112, wherein the distance between the left side wall of the movable part 5 and the second side wall 111, and the distance between the right side wall of the movable part 5 and the third side wall 112 are the maximum movement amplitudes of the movable part 5 to the left and right. When the driving coil 3 is energized, the movable part 5 moves back and forth between the first side wall 111 and the second side wall 112, that is, when moving to the left, the left elastic part 6 is compressed and the right elastic part 6 is pulled to the left, and when the movable part 5 moves to the right, the right elastic part 6 is compressed and the left elastic part 6 is pulled to the right. The vibration is mainly generated due to the high-frequency compression or stretching of the elastic parts 6 on both sides.

[0075] [Corrected 28.06.2023 according to Rule 91] The movable component 5 includes a mass 51 having a predetermined weight and at least one magnet 52 mounted on the mass 51. The larger the mass 51, the higher the inertia of the movable component 5, and accordingly, the stronger the compression or extension ability of the elastic component, and the better the vibration effect. The number of the magnets 52 can be one, two, three, or more than three. Figures 6 and 17 show an example in which the number of the magnets is three, wherein Figure 16 shows only three magnets (a first magnet 521, a second magnet 522, and a third magnet 523), wherein the second magnet 522 is located between the first magnet 521 and the third magnet 523, and its dimension along the length of the vibration motor 106 is smaller than that of the first magnet 521 and the third magnet 523. Each magnet has an N pole and an S pole, and one of the first magnet 521 and the third magnet 523 is arranged in the same direction as the magnetic pole of the second magnet 522. Figure 17 shows the magnetic pole arrangement of the upper ends of the three magnets. Taking Figure 17 as an example, the magnetic poles of the first magnet 521 and the second magnet 522 are arranged in the same direction, and the upper ends are both N poles. Correspondingly, the lower ends of the two are both S poles. The upper end of the third magnet 523 is an S pole, and the lower end is an N pole. Of course, the arrangement of the three magnet poles is not limited to that shown in Figure 17. The third magnet 523 can also be arranged in the same direction as the poles of the second magnet 522. The main function of the intermediate magnet is to concentrate magnetic field, strengthening the magnetic field generated by the magnets. Figure 16 shows an example with two magnets, with different poles at both ends. Compared to three magnets, Figure 16 only includes the first magnet 521 and the third magnet 523, without the intermediate magnet. Each magnet can be fixed to the mass block 51 by bonding or casting.

[0076] When an alternating current is passed through the driving coil 3, the driving coil 3 generates an alternating electromagnetic field. Through the action of the electromagnetic field, the movable component 5 with magnetic steel located above is pushed to reciprocate along a predetermined direction (horizontal direction or other linear direction, such as the x direction shown in Figure 2), thereby compressing or stretching the elastic component, and the high-frequency movement of the elastic component generates vibration.

[0077] Of course, the component in the movable part 5 that cooperates with the driving coil 3 to generate movement is not limited to a magnet, and can also be realized by a coil or other components. This article will not go into details.

[0078] Please refer to FIG. 6 in conjunction with FIG. 15 . In one example, a through hole 51 a may be provided in the middle of the mass block 51 , and the magnetic steel is mounted and fixed in the through hole 51 a .

[0079] Please refer to Figures 5, 6, 7 and 8 to understand that the first side wall of the housing 1 in this application has a raised portion 121 protruding toward the side away from the movable component 5. The raised portion 121 forms a cavity 12a with an opening toward the movable component 5. The drive coil 3 is at least partially located in the cavity 12a, that is, along the height direction of the vibration motor 106, the drive coil 3 can be partially located inside the cavity 12a, and of course the drive coil 3 can also be completely located inside the cavity 12a. As described above, the vibration motor 106 is usually fixed to the middle frame assembly of the electronic device by a bracket. The first side wall 12 partially protrudes toward the side where the bracket is located. In order to minimize the thickness of the electronic device, when the vibration motor 106 is assembled to the bracket, the outer wall of the raised portion 121 along the height direction (the height direction is also the direction in which the raised portion 121 protrudes) is as close to the inside of the bracket as possible, that is, the outer wall 1211 of the raised portion 121 does not extend beyond the outer wall surface 1051 of the bracket 105. Please refer to Figure 3, which shows that the outer wall 1211 of the protrusion 121 is roughly flush with the outer wall surface 1051 of the bracket 105. Correspondingly, the area of ​​the bracket 105 opposite to the protrusion 121 has an avoidance space to accommodate the protrusion 121. As shown in Figure 3, the avoidance space on the bracket 105 can be a through hole 1052, and the protrusion 121 is located inside the through hole 1052. Please understand in conjunction with Figures 3 and 8 that, in one example, the first side wall 12 includes a fixedly connected support wall 123 and a protrusion 121, and the two can be formed by processes such as stamping and stretching. The support wall 123 is fitted and fixed to the bracket 105. As mentioned above, the two can be fixed by the adhesive layer 107, and the protrusion 121 is located inside the through hole 1052.

[0080] In the present application, a local area of ​​the first side wall 12 of the housing 1 of the vibration motor 106 protrudes outward to form a concave cavity with an opening toward the movable part 5, and the driving coil 3 is partially or completely located in the concave cavity. While achieving the same electromagnetic force, the vibration motor 106 in the present application can minimize the height of the driving coil 3 protruding from the opening of the concave cavity. This increases the design space of the movable part 5 to a certain extent, increases the volume of the movable part 5, and thereby increases the weight of the movable part 5, thereby improving the vibration effect. In addition, the structure of the vibration motor 106 is more compact, which is conducive to reducing the thickness of the electronic device and meeting the requirements of lightweight and thin design of electronic equipment.

[0081] One end of the elastic component 6 is fixedly connected to the movable component 5, and the other end is fixedly connected to the inner wall of the housing 1. When one side of the elastic component 6 is compressed, the housing 1 is also subjected to a thrust in the corresponding direction, causing the vibration motor to have a tendency to move relative to the bracket 105. In one example, when the vibration motor 106 is fixed to the bracket 105 using the adhesive layer 107, when the drive coil is energized, the vibration motor 106 may have a displacement of 0.02mm to 0.03mm in the x-direction. To prevent the vibration motor from colliding with the through hole of the bracket 105 and causing noise, a predetermined gap S is also provided between the protrusion and the through hole 1052. Please refer to Figure 2 for an explanation. In one example, the predetermined gap S can be approximately 0.05mm to 0.15mm.

[0082] The vibration motor 106 of the present application also includes a circuit board 2. One of the functions of the circuit board 2 is to electrically connect the drive coil 3 in the inner cavity 1a of the vibration motor 106 to the power supply circuit outside the inner cavity 1a. The circuit board 2 includes an insulating substrate 20 and a wire arranged on the substrate 20. The substrate 20 can be made of a flexible material, that is, the circuit board 2 is a flexible circuit board 2, and the wire is a copper foil or other metal sheet printed on the substrate 20. Of course, the substrate can also be made of a non-flexible material. The drive coil 3 is connected to the external power supply circuit via a wire.

[0083] In one example, the circuit board 2 includes a first portion and a second portion, the first portion being located in the inner cavity 1a and the second portion being located outside the inner cavity 1a. The second portion is provided with a first connection end 21 and a second connection end 21'. The drive coil 3 is opposite the first portion, and the ends of the drive coil 3 are electrically connected to the first connection end 21 and the second connection end 21', respectively, via corresponding wires on the circuit board 2. The first connection end 21 and the second connection end 21' can be a pad structure, but can also be other forms, such as where the first connection end 21 and the second connection end 21' are directly formed by wires on the circuit board 2.

[0084] Accordingly, the housing 1 is provided with an opening 11b for the circuit board 2 to pass through. Referring to Figures 6 and 13 , in one example, the opening 11b is provided on the fourth side wall 113 of the cover 11. Of course, the specific configuration of the opening 11b is not limited to that described herein. The opening 11b may be formed by the side wall of the cover 11 and the first side wall 12, or the opening 11b may be provided on the first side wall 12.

[0085] In this application, the connection between the driving coil 3 and the external power supply circuit is achieved by arranging corresponding wires on the circuit board 2, which is simple and easy, and the circuit board 2 occupies a small space, which is conducive to reducing the thickness of the vibration motor 106 and thus reducing the thickness of the electronic device.

[0086] Generally, the more turns the driving coil 3 has, the greater the electric field force it generates, and correspondingly the greater the driving force generated by the driving coil 3. However, due to the height limitation of the vibration motor 106, the number of turns of the driving coil 3 is limited. In order to maximize the driving force, this application also makes the following settings.

[0087] Please refer to Figures 10, 11 and 12. Figure 10 is a cross-sectional view of the first side wall, drive coil and circuit board assembly in the vibration motor shown in Figure 5. Figure 11 is a schematic diagram of the first side of the circuit board in the vibration motor shown in Figure 6. Figure 12 is a schematic diagram of the second side of the circuit board in the vibration motor shown in Figure 6.

[0088] In the present application, the driving coil 3 includes a cylindrical coil and a planar coil. The so-called cylindrical coil is a winding having at least two layers of metal wires along the thickness direction of the vibration motor 106, and each layer is formed by winding multiple turns of metal wires from the outside to the inside. The planar coil is arranged on the first part of the circuit board 2 and is wound one by one in the plane of the circuit board 2 along a predetermined direction. The planar coil and the cylindrical coil are connected in series and have the same current rotation direction. This means that the current rotation direction of each metal wire in each layer of the planar coil and the cylindrical coil is the same. The planar coils are all formed by wiring on the substrate 20.

[0089] In the present application, the planar coil provided on the circuit board 2 increases the electromagnetic field strength of the driving coil 3 to a certain extent.

[0090] In order to maximize the electromagnetic field strength of the driving coil 3, planar coils can be set on both sides of the circuit board 2, namely the first planar coil 22 and the second planar coil 24. The first planar coil 22 is located on the first side of the circuit board 2 facing the movable part 5, as shown in Figure 12; the second planar coil 24 is located on the second side of the circuit board 2 away from the movable part 5, as shown in Figure 12.

[0091] Please understand in conjunction with Figures 10 and 11 that, in this application, the cylindrical coil may include a first cylindrical coil 31 and a second cylindrical coil 32. The first cylindrical coil 31 is located on the first side, the second cylindrical coil 32 is located on the second side, and the second cylindrical coil 32 is at least partially located within the concave cavity. The first cylindrical coil 31, the first planar coil 22, the second planar coil 24, and the second cylindrical coil 32 are electrically connected end to end. The first end 221 of the first planar coil 22 is connected to the first cylindrical coil 31, and the two can be connected by welding or other methods. The second end 222 of the first planar coil 22 can be connected to the first end 241 of the second planar coil 24 via a first metal member 23 that passes through the substrate 20. When the first and second connecting ends are disposed on the first side of the circuit board 2, the second end 242 of the second planar coil 24 is connected to the second connecting end 21' via a wire on the circuit board 2 and a second metal member 23' that passes through the substrate 20. In one example, the circuit board 2 can be provided with a first through-hole and a second through-hole for respectively securing the first and second metal members 23, 23'.

[0092] The free end of the first cylindrical coil 31 and the free end of the second cylindrical coil 32 are electrically connected to the first connection end 21 and the second connection end 21', respectively. Referring again to Figures 12 and 13, the free end of the first cylindrical coil 31 is connected to the first connection end 21, and the free end of the second cylindrical coil 32 is electrically connected to the second connection end 21'. The first cylindrical coil 31 and the first connection end 21 can be connected directly or via a wire pre-arranged on the circuit board 2. Similarly, the free end of the second cylindrical coil 32 and the second connection end 21' can be connected directly or via a wire pre-arranged on the circuit board 2.

[0093] In order to maximize the driving force of the driving coil 3, a groove 5a is formed at a position of the movable component 5 opposite to the second cylindrical coil 32, and a portion of the second cylindrical coil 32 extends into the groove 5a.

[0094] In the present application, the first cylindrical coil 31 , the first planar coil 22 , the second planar coil 24 and the second cylindrical coil 32 are coaxially arranged, which is conducive to forming a magnetic field with good magnetic concentration capability.

[0095] The first planar coil 22 and the second planar coil 24 can be identical or different. The sizes and shapes of the first planar coil 22 and the second planar coil 24 can be reasonably set according to the specific space.

[0096] In the present application, at least a portion of the edge area of ​​the second side surface of the first portion is supported at the opening of the cavity 12a, and the second cylindrical coil 32 is completely located inside the cavity 12a. Referring to Figure 13, in the present application, the upper and lower edges of the second side surface of the circuit board 2 are supported on the first side wall 12. Therefore, coils cannot be set in the upper and lower edge areas of the second side surface to provide a supporting and matching area with the first side wall. Figure 12 shows the distance h between the outermost wire of the second planar coil 24 and the upper edge. h can be reasonably set according to the specific product. The fact that the specific value of h is not disclosed in this application does not affect the understanding and implementation of the technical solution of this article by those skilled in the art.

[0097] However, there is no installation requirement on the first side surface of the circuit board 2 , so the outer ring of the first planar coil can be as close as possible to the edge 202 of the first side surface, as shown in FIG11 .

[0098] The first cylindrical coil 31 and the second cylindrical coil 32 can be fixed to the circuit board 2 by a bonding process or an injection molding process.

[0099] In order to improve the gathering ability of the driving coil 3, the inner hole of the cylindrical coil in this application is provided with a magnetic core component 4, that is, for the case where the cylindrical coil includes a first cylindrical coil 31 and a second cylindrical coil 32, at least one of the first cylindrical coil 31 and the second cylindrical coil 32 is provided with a magnetic core component 4. This application gives an example in which the first cylindrical coil 31 and the second cylindrical coil 32 are both provided with a magnetic core component 4, that is, the magnetic core component 4 includes a first magnetic core portion 41 and a second magnetic core portion 42. The first magnetic core portion 41 is provided on the first cylindrical coil 31, and the two can be formed into one piece by injection molding. The second magnetic core portion 42 is provided on the second cylindrical coil 32, and the two can also be formed into one piece by injection molding. Of course, the first magnetic core portion 41 and the first cylindrical coil 31 can also be a split structure, and the second magnetic core portion 42 and the second cylindrical coil 32 can also be a split structure, which is convenient for later maintenance and replacement.

[0100] Taking into account the influence of the magnetic field strength of the magnetic steel in the movable component 5 on the magnetic core component 4, the present application also makes the following arrangements.

[0101] Please refer to Figure 7 again. In this application, the distance between the magnetic core component 4 and the movable component 5 is greater than the distance between the first cylindrical coil 31 and the movable component 5. As can be seen from Figure 10, the end surface 411 of the magnetic core component 4 near the movable component 5 is lower than the upper edge of the top metal wire 311 of the first cylindrical coil 31. In other words, the magnetic core component 4 is completely located inside the inner hole of the first cylindrical coil 31, and there is a height difference H1 between the top upper edge of the first cylindrical coil 31 and the end surface 411 of the magnetic core component 4. In the case where the magnetic core component 4 includes a first magnetic core portion 41 and a second magnetic core portion 42, the distance between the end surface 411 of the first magnetic core portion 41 and the top upper edge of the first cylindrical coil 31 is H1.

[0102] The circuit board 2 of the present application further includes a through hole 201, which extends through the inner regions of the first and second planar coils 22, 24. The magnetic core component 4 extends through the through hole. In other words, the inner regions of the first and second planar coils 22, 24 are also provided with a magnetic core component 4. In one embodiment, the magnetic core component 4 includes a third magnetic core portion 43, which is located in the through hole. The third magnetic core portion 43 mates with the through hole 201.

[0103] Of course, the first magnetic core portion 41 matches the inner hole of the first cylindrical coil 31, and the second magnetic core portion 42 is located in the inner hole of the second cylindrical coil 32 and matches the inner hole of the second cylindrical coil 32. The magnetic core component 4 of this structural form has a relatively strong magnetic gathering ability. In the above example, the first magnetic core portion 41, the second magnetic core portion 42 and the third magnetic core portion 43 are an integrated structure, and of course they can also be a split structure. As mentioned above, the first magnetic core portion 41 and the first cylindrical coil 31 are integrally injection molded, the second magnetic core portion 42 and the second cylindrical coil 32 are integrally injection molded, and the third magnetic core portion 43 can be integrally molded with the insulating substrate through injection molding or bonding processes.

[0104] In order to improve the service life of the second part of the circuit board 2, the present application provides an extension portion 122 on the first side wall 12, and the extension portion 122 is located outside the inner cavity 1a. The second part of the circuit board 2 is supported on the extension portion 122. The shape of the extension portion 122 can be roughly the same as the shape of the second part of the circuit board 2. Of course, it can also be larger or smaller than the second part, that is, the projection of the second part on the extension portion 122 is completely located on the inner side of the extension portion 122, or partially exceeds the extension portion 122, as long as it can provide support for the second part.

[0105] Furthermore, the present application also provides an electronic device 100, comprising any of the vibration motors 106 described above.

[0106] The electronic device 100 in this application includes a vibration motor 106 , so both devices also have the above-mentioned technical effects of the vibration motor 106 .

[0107] As described above, the present application makes full use of the thickness of the bracket and embeds part or all of the driving coil of the vibration motor 106 into the bracket. This reduces the installation height of the vibration motor to a certain extent, thereby reducing the overall thickness of the electronic device and meeting the requirements of lightweight and thin design of electronic equipment.

[0108] The bracket for securing the vibration motor 106 can be a metal bracket. Metal brackets are strong and provide greater reliability in securing the vibration motor 106, thereby extending the service life of the electronic device. Alternatively, brackets made of other materials, such as plastic, can be used. Plastic brackets are relatively lightweight, thereby reducing the overall weight of the electronic device. The bracket material can be appropriately selected based on the specific usage environment.

[0109] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core ideas of this application. It should be noted that for those skilled in the art, without departing from the principles of this application, various improvements and modifications can be made to this application, and such improvements and modifications also fall within the scope of protection of the claims of this application.

Claims

1. A vibration motor, characterized in that: It includes a shell, an inner cavity of which is provided with a driving coil and a movable part, the driving coil is used to drive the movable part to reciprocate relative to the shell to generate vibration: the first side wall of the shell has a protrusion protruding toward the side away from the movable part, the protrusion forms a concave cavity with an opening toward the movable part, and the driving coil is at least partially located in the concave cavity.

2. The vibration motor according to claim 1, wherein Elastic components are provided between the two opposite side walls of the movable component and the inner wall of the shell on the corresponding side.

3. The vibration motor according to claim 2, wherein It also includes a circuit board, which includes a first part located in the inner cavity and a second part located outside the inner cavity, the second part is provided with a first connection end and a second connection end, the driving coil is opposite to the first part, and the two ends of the driving coil are respectively electrically connected to the first connection end and the second connection end through corresponding wires on the circuit board.

4. The vibration motor according to claim 3, wherein The driving coil includes a cylindrical coil and a planar coil. The planar coil is arranged in the first part and is wound in a predetermined direction in the plane of the circuit board. The planar coil and the cylindrical coil are connected in series and have the same current rotation direction.

5. The vibration motor according to claim 4, wherein The planar coil includes a first planar coil and a second planar coil connected in series and having the same current rotation direction. The first planar coil is located on a first side of the circuit board facing the movable component, and the second planar coil is located on a second side of the circuit board facing away from the movable component.

6. The vibration motor according to claim 5, wherein The cylindrical coil includes a first cylindrical coil and a second cylindrical coil, the first cylindrical coil is located on the first side, and the second cylindrical coil is located on the second side; the first cylindrical coil, the first planar coil, the second planar coil and the second cylindrical coil are electrically connected end to end in sequence, and the free end of the first cylindrical coil and the free end of the second cylindrical coil are electrically connected to the first connection end and the second connection end respectively.

7. The vibration motor according to claim 6, wherein The first cylindrical coil, the first planar coil, the second planar coil, and the second cylindrical coil are coaxially arranged.

8. The vibration motor according to claim 6 or 7, wherein: At least a portion of the edge region of the second side surface of the first portion is supported at the opening of the cavity, and the second cylindrical coil is completely located inside the cavity.

9. The vibration motor according to any one of claims 6 to 8, wherein The first cylindrical coil and the second cylindrical coil are fixed to the circuit board through a bonding process.

10. The vibration motor according to any one of claims 6 to 8, wherein A magnetic core component is further provided in the inner hole of at least one of the first cylindrical coil and the second cylindrical coil.

11. The vibration motor according to claim 10, wherein A distance between the magnetic core component and the movable component is greater than a distance between the first cylindrical coil and the movable component.

12. The vibration motor according to claim 10 or 11, wherein: The circuit board has a through hole, the through hole passes through the inner coil areas of the first planar coil and the second planar coil, and the magnetic core component passes through the through hole.

13. The vibration motor according to claim 12, wherein The magnetic core component includes a first magnetic core portion, a second magnetic core portion and a third magnetic core portion. The first magnetic core portion is located in the inner hole of the first cylindrical coil and matches the inner hole of the first cylindrical coil. The second magnetic core portion is located in the inner hole of the second cylindrical coil and matches the inner hole of the second cylindrical coil. The third magnetic core portion matches the through hole.

14. The vibration motor according to claim 13, wherein The first magnetic core portion, the second magnetic core portion and the third magnetic core portion are of an integrated structure or a split structure.

15. The vibration motor according to any one of claims 6 to 14, wherein A groove is formed at a position of the movable component opposite to the second cylindrical coil, and a portion of the second cylindrical coil extends into the groove.

16. The vibration motor according to any one of claims 3 to 15, wherein: The first side wall has an extension portion, the extension portion is located outside the inner cavity, and the second portion is supported by the extension portion.

17. The vibration motor according to any one of claims 1 to 16, wherein: The movable component includes a mass block and at least one magnet installed on the mass block, and the elastic component is installed between the mass block and the housing.

18. The vibration motor according to any one of claims 3 to 17, wherein: The circuit board is a flexible circuit board.

19. An electronic device, characterized in that: The vibration motor comprises the vibration motor according to any one of claims 1 to 18, wherein the vibration motor is fixed to the electronic device via a bracket, and along the protruding direction of the protrusion, the outer wall of the protrusion does not exceed the outer wall of the bracket.

20. The electronic device according to claim 19, wherein The first side wall includes a fixedly connected support wall and the protrusion, the support wall is fixedly fitted with the bracket, the bracket has an escape space, and the protrusion is located in the escape space.

21. The electronic device according to claim 20, wherein: The avoidance space includes a through hole.

22. The electronic device according to claim 21, wherein A predetermined gap is formed between the protrusion and the inner wall of the through hole.

23. The electronic device according to any one of claims 20 to 22, wherein: The supporting wall and the bracket are fixed via an adhesive layer.

24. The electronic device according to any one of claims 19 to 23, wherein: The bracket is a middle plate of a middle frame assembly of the electronic device or a PCB of the electronic device.

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