Vibrating motor and electronic device

Abstract

The application discloses a vibrating motor and electronic equipment, and belongs to the field of intelligent equipment. The vibrating motor comprises a shell, a mass block in the inner cavity of the shell, wherein the opposite ends of the mass block are connected with the shell through elastic elements respectively, an electrostatic driving assembly in the inner cavity of the shell and arranged in a cylindrical shape around the mass block, and the shell and the mass block are connected; the opposite ends of the mass block connected with the elastic elements are located at the opening ends of the electrostatic driving assembly in the cylindrical shape; and the electrostatic driving force is generated through the electrostatic driving assembly to drive the mass block to move relative to the shell in the direction of approaching or moving away from the elastic elements.

Description

Technical Field

[0001] This application belongs to the field of intelligent device technology, specifically relating to a vibration motor and electronic device. Background Technology

[0002] With the continuous development of smart devices, they can meet people's diverse entertainment needs, such as playing games. Currently, users have increasingly higher demands for gaming experiences, with immersion and realism becoming core focuses. In this context, speakers and vibration motors on smart devices have become key components for enhancing the experience. Existing technologies employing dual vibration motors allow users to experience different vibrational feedback in their left and right hands, enabling them to interpret game scenes through these vibrations.

[0003] However, existing vibration motors (such as dual vibration motors) are relatively large, which can affect the stacking design of other components on smart devices and increase the difficulty of overall layout design of smart devices. Summary of the Invention

[0004] The purpose of this application is to provide a vibration motor and electronic device that can solve the problem that the large size of existing vibration motors makes the overall layout design of smart devices difficult.

[0005] In a first aspect, embodiments of this application provide a vibration motor, including: case; A mass block located within the cavity of the housing; wherein the opposite ends of the mass block are respectively connected to the housing via elastic elements; An electrostatic drive assembly, located within the inner cavity of the housing and arranged in a cylindrical shape around the mass block, connects the housing and the mass block; the opposite ends of the mass block connected to the elastic element are located at the open ends of the cylindrical electrostatic drive assembly; the electrostatic drive assembly generates an electrostatic driving force to drive the mass block to move relative to the housing towards or away from the elastic element.

[0006] Secondly, embodiments of this application provide an electronic device including a vibration motor as described in the first aspect.

[0007] In this embodiment, the vibration motor includes an electrostatic drive assembly connecting a housing and a mass block. The mass block is located within the housing cavity, and its opposite ends are connected to the housing via elastic elements. The electrostatic drive assembly is located within the housing cavity and is cylindrically arranged around the mass block. The opposite ends of the mass block connected to the elastic elements are located at the open ends of the cylindrical electrostatic drive assembly. The electrostatic drive force generated by the electrostatic drive assembly drives the mass block to move relative to the housing towards or away from the elastic elements. When a voltage is applied to the electrostatic drive assembly, the electrostatic drive assembly generates an electrostatic drive force. This force acts on the mass block and the elastic elements, causing the mass block to move relative to the housing towards or away from the elastic elements and then impact the outside to generate vibration, thus realizing the vibration function of the vibration motor. Furthermore, by combining the electrostatic drive assembly with the housing and the mass block in the design of the vibration motor, the volume of the vibration motor can be reduced, achieving miniaturization and providing space for stacking the entire machine, thereby reducing the difficulty of overall layout design. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of a traditional X-axis linear motor; Figure 2 This is one of the structural schematic diagrams of the vibration motor according to an embodiment of this application; Figure 3 This is a second schematic diagram of the structure of the vibration motor according to an embodiment of this application; Figure 4 This is the third schematic diagram of the structure of the vibration motor according to an embodiment of this application; Figure 5 This is a schematic diagram showing the position between the fixed comb teeth and the movable comb teeth in an embodiment of this application; Figure 6 This is the electrostatic drive principle structure of the embodiment of this application. Figure 1 ; Figure 7 This is the electrostatic drive principle structure of the embodiment of this application. Figure 2 . Detailed Implementation

[0009] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0010] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more.

[0011] Currently, vibration motors typically employ electromagnetic methods, using energized coils to generate Lorentz force, which in turn moves a mass. For example... Figure 1 The diagram shows a traditional X-axis linear motor. This vibration motor includes an upper cover 100, a copper plate 200, a spring 300, a magnetic plate 400, a mass block 500, a magnet 600, a coil 700, a lower cover 800, and a flexible circuit board 900. The vibration motor is connected to the mass block 500 through the spring 300. Over time, the failure rate of the spring 300 is relatively high. At the same time, the bandwidth is narrow, which may cause the vibrator to rub against the housing during vibration, generating noise. Furthermore, the spring 300 and the mass block 500 are the components with the largest volume in the vibration motor. The volume of these two components determines the size of the vibration motor, which is not conducive to the stacking of the whole machine.

[0012] To address the aforementioned problems, this application provides a vibration motor and an electronic device.

[0013] The vibration motor provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0014] like Figures 2-7 As shown, the vibration motor of this embodiment includes: a housing 1; a mass block 2 located in the inner cavity of the housing 1, specifically the mass block 2 located in the middle of the inner cavity of the housing 1; wherein, the opposite ends of the mass block 2 are respectively connected to the housing 1 through elastic elements 3; an electrostatic drive assembly located in the inner cavity of the housing 1 and arranged in a cylindrical shape around the mass block 2, connecting the housing 1 and the mass block 2; specifically, the electrostatic drive assembly is located in the middle of the inner cavity of the housing 1; the opposite ends of the mass block 2 connected to the elastic elements 3 are located at the open ends of the cylindrical electrostatic drive assembly; an electrostatic driving force is generated by the electrostatic drive assembly to drive the mass block 2 to move relative to the housing 1 in a direction closer to or away from the elastic elements 3. Specifically, the electrostatic driving force drives the mass block 2 to move relative to the housing 1 in a direction closer to or away from the elastic elements 3, where the elastic element 3 specifically refers to the elastic element 3 located at one end of the mass block 2.

[0015] Here, the housing 1 serves to support the main body. After applying voltage to the electrostatic drive assembly, the electrostatic drive assembly generates an electrostatic driving force. This force acts on the mass block 2 and the elastic element 3, causing the mass block 2 to move relative to the housing 1 towards or away from the elastic element 3, and then impact the outside to generate vibration. That is, in this embodiment, the vibration function of the vibration motor is achieved by moving the mass block 2 through the electrostatic drive assembly. The electrostatic drive assembly utilizes electrostatic attraction to achieve drive, which is highly efficient and easy to control.

[0016] This embodiment employs electrostatic drive, eliminating the need for magnets and coils. It avoids considerations regarding magnetic flux density B and inductance L, thus reducing the size limitations of the drive unit; only a mass block needs to be incorporated. Furthermore, while existing vibration motors integrate the mass block and magnet into a single structure (the mass block surrounds the magnet), this embodiment, using electrostatic drive, eliminates the need for magnets. Consequently, the dimensions of the housing 1 and the mass block 2 can be significantly reduced, thereby decreasing the overall size of the vibration motor.

[0017] In an optional embodiment, the electrostatic drive assembly includes: a first circuit board 4 fixedly connected to the housing 1; a second circuit board 5 connected to the mass block 2; a first electrostatic comb structure 6 disposed on the housing 1 and electrically connected to the first circuit board 4; and a second electrostatic comb structure 7 disposed on the mass block 2 and electrically connected to the second circuit board 5.

[0018] Specifically, voltage is applied to the first electrostatic comb structure 6 by the first circuit board 4, and voltage is applied to the second electrostatic comb structure 7 by the second circuit board 5, thereby generating an electrostatic driving force between the first electrostatic comb structure 6 and the second electrostatic comb structure 7.

[0019] Here, the housing 1 can be fixedly connected to the first circuit board 4 by adhesive, and the mass block 2 can be fixedly connected to the second circuit board 5 by adhesive. Both the first circuit board 4 and the second circuit board 5 are connected to the external circuit.

[0020] Optionally, both the first circuit board 4 and the second circuit board 5 are flexible circuit boards. Firstly, flexible circuit boards have good bendability and can be arranged arbitrarily according to spatial layout requirements; secondly, flexible circuit boards are thin, can be combined with the mass block 2 and the shell 1, and can achieve the function of conducting electricity through the elastic element 3, making great use of the internal space of the vibration motor.

[0021] Specifically, the first circuit board 4 is located inside the housing 1 and includes: a first circuit sub-board, a second circuit sub-board and a third circuit sub-board, wherein the second circuit sub-board is connected to the first circuit sub-board and the third circuit sub-board respectively.

[0022] The second circuit board is fixedly connected to the bottom of the housing 1, and the first circuit board and the third circuit board are fixedly connected to the two opposite side walls of the housing 1, respectively.

[0023] The two first electrostatic comb structures 6 are respectively connected to the first circuit board and the third circuit board. That is, the two first electrostatic comb structures 6 are designed close to the two opposite side walls of the housing 11, which can reserve sufficient space for the movement of the mass block.

[0024] The aforementioned design of the first circuit board 4 fitting into the housing 1 facilitates high integration of the electrostatic drive components, thereby further reducing the size of the vibration motor.

[0025] Specifically, the second circuit board 5 is arranged around the mass block 2 to form a cavity with open ends and hollow interior; wherein the mass block 2 is fixed inside the cavity.

[0026] The two second electrostatic comb structures 7 are respectively connected to the first side 51 and the second side 52 of the second circuit board 5. The first side 51 and the second side 52 are the two remaining opposing sides of the second circuit board 5, excluding the two sides opposite to the bottom of the housing 1. Here, the positions of the two second electrostatic comb structures 7 are designed to cooperate with the first electrostatic comb structure 6 so that an electrostatic driving force is generated between the first electrostatic comb structure 6 and the second electrostatic comb structure 7.

[0027] The above-mentioned design of the second circuit board 5 bonded to the mass block 2 is conducive to the high integration of the electrostatic drive component, thereby further reducing the size of the vibration motor.

[0028] In an optional embodiment, the first electrostatic comb structure 6 includes a plurality of fixed comb teeth 61 spaced apart; the second electrostatic comb structure 7 includes a plurality of movable comb teeth 71 spaced apart; wherein, the movable comb teeth 71 correspond one-to-one with the fixed comb teeth 61, and the movable comb teeth 71 are inserted into the fixed comb teeth 61; both the fixed comb teeth 61 and the movable comb teeth 71 are provided with conductive structures.

[0029] Here, voltage is applied to the first electrostatic comb tooth structure 6 by the first circuit board 4, and voltage is applied to the second electrostatic comb tooth structure 7 by the second circuit board 5. That is, voltage is applied between multiple fixed comb teeth 61 and multiple movable comb teeth 71. The resulting electrostatic driving force causes the movable comb teeth 71 to move inside the fixed comb teeth 61, and the movable comb teeth 61 drive the mass block 2 to move.

[0030] See Figure 5Specifically, the fixed comb teeth 61 are sheet-shaped and have opposing third side 8 and fourth side 9; the movable comb teeth 71 are sheet-shaped panels, which are inserted between the third side 8 and the fourth side 9. The conductive structure of the fixed comb teeth 61 includes multiple electrode plates (such as electrode plate 101, electrode plate 102 and electrode plate 103) respectively disposed on the side of the third side 8 near the sheet panel and the side of the fourth side 9 near the sheet panel; the conductive structure of the movable comb teeth 71 includes an electrode plate (not shown in the figure) respectively disposed on both sides of the sheet panel.

[0031] Optionally, the multiple electrode plates on the fixed comb teeth 61 are spaced apart, and the polarities of adjacent electrode plates are opposite. For example, electrode plates 101 and 102 have opposite polarities, and electrode plates 102 and 103 have opposite polarities.

[0032] See Figure 5 By utilizing multiple electrode plates on the fixed comb teeth 61, the movable comb teeth 71 can be driven to move left or right. Due to the different positions of the electrode plates, the position of the movable comb teeth 71 can be accurately identified, thereby realizing the mass block position detection function. Similar to an electromagnetic Hall effect device, it can accurately detect the movement position of the motor, reduce start-stop time, and perform closed-loop control. It should be noted that the more electrode plates there are, the more accurate the positioning.

[0033] See Figure 6 Structure based on electrostatic drive principle Figure 1 When a voltage is applied between the fixed comb teeth 61 and the movable comb teeth 71, a non-uniform electric field is generated between the comb teeth. Under the action of electrostatic attraction, the movable comb teeth 71 move within the fixed comb teeth 61.

[0034] See Figure 7 Structure based on electrostatic drive principle Figure 2 If different voltages are applied to the two electrode plates with opposite polarities on the fixed comb tooth 61, and a single voltage is applied to the electrode plate on the movable comb tooth 71, an axial driving force can be generated. This is the principle of electrostatic drive.

[0035] It should be noted that traditional vibration motors have damping designs, such as Cu sheets with electromagnetic damping, but this application does not have this structure. Instead, the response time is controlled solely by voltage electrodes, and the response time is superior to that of electromagnetic damping. The electrostatic drive component of this application has a high degree of integration, requiring minimal space when placed on a device; only the distance between the positive and negative electrodes and the driving voltage need to be considered.

[0036] Optionally, the elastic element 3 is a spring. This embodiment uses a spring instead of a sheet spring structure, reducing the volume. During design, the vibration frequency can be adjusted by changing the material, shape, and welding condition of the spring.

[0037] Here, the spring can be connected to a third circuit board, which is connected to the second circuit board 5 through the spring, so as to apply voltage to the second electrostatic comb structure 7.

[0038] The vibration motor in this embodiment combines the electrostatic drive component with the housing and the mass block, thereby reducing the size of the vibration motor, miniaturizing the vibration motor, creating space for the overall machine stacking, and thus reducing the difficulty of the overall machine layout design.

[0039] This application also provides an electronic device that includes a vibration motor as described in the above embodiments.

[0040] By adopting the aforementioned miniaturized vibration motor, space can be created for the overall stacking of electronic devices, thereby reducing the difficulty of overall layout design.

[0041] In this application, the electronic device can be a mobile phone, tablet computer, laptop computer, handheld computer, vehicle-mounted electronic device, mobile internet device (MID), augmented reality (AR) / virtual reality (VR) device, robot, wearable device, ultra-mobile personal computer (UMPC), netbook or personal digital assistant (PDA), network attached storage (NAS), personal computer (PC), television (TV), ATM or self-service machine, etc. This application does not specifically limit the electronic device.

[0042] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A vibration motor, characterized in that, include: case; A mass block located within the cavity of the housing; wherein the opposite ends of the mass block are respectively connected to the housing via elastic elements; An electrostatic drive assembly, located within the inner cavity of the housing and arranged in a cylindrical shape around the mass block, connects the housing and the mass block; the opposite ends of the mass block connected to the elastic element are located at the open ends of the cylindrical electrostatic drive assembly. The electrostatic driving component generates an electrostatic driving force, which drives the mass block to move relative to the housing in a direction closer to or farther from the elastic element. The electrostatic drive assembly includes: The first circuit board is fixedly connected to the housing; The second circuit board connected to the mass block; The first electrostatic comb structure disposed on the housing is electrically connected to the first circuit board; The second electrostatic comb structure disposed on the mass block is electrically connected to the second circuit board; Wherein, voltage is applied to the first electrostatic comb structure by the first circuit board, and voltage is applied to the second electrostatic comb structure by the second circuit board, and an electrostatic driving force is generated between the first electrostatic comb structure and the second electrostatic comb structure. The first electrostatic comb structure includes a plurality of fixed comb teeth spaced apart; the second electrostatic comb structure includes a plurality of movable comb teeth spaced apart. The movable comb teeth correspond one-to-one with the fixed comb teeth, and the movable comb teeth are inserted into the fixed comb teeth; both the fixed comb teeth and the movable comb teeth are provided with conductive structures. The fixed comb teeth are sheet-shaped and have opposing third and fourth sides; the movable comb teeth are sheet-shaped panels, which are inserted between the third and fourth sides. The conductive structure of the fixed comb teeth includes multiple electrode plates respectively disposed on the third side near the sheet panel and on the fourth side near the sheet panel; the conductive structure of the movable comb teeth includes one electrode plate respectively disposed on both sides of the sheet panel. The multiple electrode plates on the fixed comb teeth are spaced apart, and the polarities of adjacent electrode plates are opposite.

2. The vibration motor according to claim 1, characterized in that, The first circuit board is located inside the housing and includes: a first circuit sub-board, a second circuit sub-board, and a third circuit sub-board, wherein the second circuit sub-board is connected to the first circuit sub-board and the third circuit sub-board respectively; The second circuit board is fixedly connected to the bottom of the housing, and the first circuit board and the third circuit board are fixedly connected to the two opposite side walls of the housing, respectively. The two first electrostatic comb structures are respectively connected to the first circuit board and the third circuit board.

3. The vibration motor according to claim 1, characterized in that, The second circuit board is arranged around the mass block, forming a cavity with openings at both ends and a hollow interior; The mass block is fixed inside the cavity; The two second electrostatic comb structures are respectively connected to the first side and the second side of the second circuit board. The first side and the second side are the two opposing sides of the second circuit board other than the two sides opposite to the bottom of the housing.

4. The vibration motor according to claim 1, characterized in that, The elastic element is a spring.

5. The vibration motor according to claim 1, characterized in that, Both the first circuit board and the second circuit board are flexible circuit boards.

6. An electronic device, characterized in that, Including the vibration motor as described in any one of claims 1 to 5.

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