A vibrating device

Abstract

The application discloses a vibrating device, which comprises a shell, a vibrator assembly, a stator assembly, an elastic element and a limiting block; the vibrator assembly and the stator assembly are arranged in a cavity of the shell; the vibrator assembly comprises a permanent magnet and a counterweight; the counterweight is provided with a containing cavity, and the permanent magnet is arranged in the containing cavity; the stator assembly comprises a coil; the limiting block is fixedly connected to an inner bottom surface of the shell close to the permanent magnet; the counterweight is provided with a first recessed area and a second recessed area; the coil is at least partially arranged in the first recessed area, and the limiting block is at least partially arranged in the second recessed area; along a vibration direction of the vibrator assembly, the distance between the limiting block and the sidewall of the second recessed area is smaller than the distance between the coil and the sidewall of the first recessed area.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic products, in particular to a vibration device. BACKGROUND

[0002] The vibration device is usually realized by a vibrator assembly to reciprocate regularly. With the rapid development of portable consumer electronic devices, mobile phones, handheld multimedia entertainment devices and the like enter people's life, and the electrical components in these electronic devices become smaller, lighter and thinner. In these electronic devices, a vibration device such as a micro linear vibration motor is usually used to make the vibration feedback of the system, such as the vibration feedback of the incoming call reminder of the mobile phone, the touch feedback, the vibration feedback of the game machine and the like. The existing vibration device is prone to collision of the internal structure during the vibration process. In order to better protect the internal structure of the vibration device and increase the service life, a new technical solution is needed to solve the technical problem that the internal structure of the vibration device is prone to collision during the vibration process. SUMMARY

[0003] An object of the present application is to provide a new technical solution of a vibration device.

[0004] According to a first aspect of the present application, a vibration device is provided, comprising:

[0005] a housing, the housing having a cavity therein;

[0006] a vibrator assembly, the vibrator assembly being disposed in the cavity, the vibrator assembly comprising a permanent magnet and a counterweight, the counterweight having a receiving cavity therein, the permanent magnet being disposed in the receiving cavity;

[0007] a stator assembly, the stator assembly being disposed in the cavity, the stator assembly comprising a coil; the coil and the permanent magnet reciprocating the vibrator assembly by electromagnetic force;

[0008] an elastic element, the vibrator assembly being suspended in the cavity by the elastic element;

[0009] a limiting block, the housing being fixedly connected with the limiting block near the inner bottom surface of the permanent magnet; the counterweight being provided with a first recessed area and a second recessed area, the coil being at least partially located in the first recessed area, and the limiting block being at least partially located in the second recessed area; along the vibration direction of the vibrator assembly, the distance between the limiting block and the sidewall of the second recessed area is less than the distance between the coil and the sidewall of the first recessed area.

[0010] Optionally, the limiting block is welded or bonded to the inner bottom surface of the housing near the permanent magnet, and the limiting block has a flat plate structure.

[0011] Optionally, the limiting block is welded or bonded to the inner bottom surface of the shell near the permanent magnet, and the middle part of the limiting block has a through hole.

[0012] Optionally, the limiting block is welded or bonded to the inner bottom surface of the shell near the permanent magnet, and the middle part of the limiting block has a protrusion, and the inner bottom surface of the shell near the permanent magnet is provided with an opening, and the protrusion is matched and connected with the opening.

[0013] Optionally, the limiting block is integrally formed with the shell, and the inner bottom surface of the shell near the permanent magnet is recessed inward to form the limiting block.

[0014] Optionally, the elastic element is two V-shaped elastic sheets, and the two V-shaped elastic sheets are respectively located on both sides of the weight block along the vibration direction of the vibrator assembly.

[0015] Optionally, the inner side of the open end of each V-shaped elastic sheet is connected with a stop block, and the distance between the two stop blocks in each V-shaped elastic sheet is greater than the distance between the limiting block and the side wall of the second recessed area along the vibration direction of the vibrator assembly.

[0016] Optionally, the stator assembly further comprises a damping coil, and the damping coil is arranged on the same side of the coil and / or the opposite side of the coil.

[0017] Optionally, the damping coil arranged on the same side of the coil is at least partially located in the first recessed area; and the distance between the limiting block and the side wall of the second recessed area is less than the distance between the damping coil and the side wall of the first recessed area along the vibration direction of the vibrator assembly.

[0018] Optionally, the opposite side of the coil is provided with a damping coil, and the opposite bottom surface of the weight block has a third recessed area, and the damping coil is at least partially located in the third recessed area; and the distance between the limiting block and the side wall of the second recessed area is less than the distance between the damping coil and the side wall of the third recessed area along the vibration direction of the vibrator assembly.

[0019] Optionally, the coil is externally sleeved with a damping frame, and the distance between the limiting block and the side wall of the second recessed area is less than the distance between the damping frame and the side wall of the first recessed area along the vibration direction of the vibrator assembly.

[0020] The vibration device provided by the embodiment of the present application is provided with a limiting block, and the counterweight block is provided with a first recessed area and a second recessed area, the limiting block is at least partially located in the second recessed area, and the coil is at least partially located in the first recessed area. Along the direction of reciprocating vibration of the vibrator assembly, the distance between the limiting block and the sidewall of the second recessed area is smaller than the distance between the coil and the sidewall of the first recessed area. Therefore, the limiting block can prevent the coil from colliding with the vibrator assembly during the reciprocating vibration of the vibrator assembly, which effectively avoids the damage of the coil and the vibrator assembly, protects the internal structure of the vibration device, and prolongs the service life of the vibration device.

[0021] Other features of the present application, and their advantages, will become apparent from the following detailed description of exemplary embodiments of the present application, with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application.

[0023] Figure 1 An exploded structural schematic view of a vibration device provided by the present application;

[0024] Figure 2 A sectional structural schematic view of a vibration device provided by the present application;

[0025] Figure 3 A first embodiment of the shape of a limiting block in a vibration device provided by the present application;

[0026] Figure 4 A second embodiment of the shape of a limiting block in a vibration device provided by the present application;

[0027] Figure 5 A third embodiment of the shape of a limiting block in a vibration device provided by the present application;

[0028] Figure 6 A fourth embodiment of the shape of a limiting block in a vibration device provided by the present application;

[0029] Figure 7 A first embodiment of a damping coil provided in a vibration device provided by the present application;

[0030] Figure 8 A second embodiment of a damping coil provided in a vibration device provided by the present application;

[0031] Figure 9 An embodiment of a damping frame provided in a vibration device provided by the present application. DETAILED DESCRIPTION

[0032] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0033] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0034] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0035] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0036] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0037] The embodiment of the present invention provides a vibration device, referring to Figure 1 、 Figure 2 As shown, the vibration device includes a shell 1, which has a cavity therein; the vibration device also includes a vibrator assembly, which is arranged in the cavity, and the vibrator assembly includes a permanent magnet 2; the vibration device also includes a stator assembly, which is arranged in the cavity, and the stator assembly includes a coil 3; the coil 3 and the permanent magnet 2 cause the vibrator assembly to vibrate reciprocatingly through electromagnetic force; the permanent magnet 2 is arranged near one inner bottom surface of the shell 1, and the coil 3 is arranged near the other inner bottom surface opposite to the shell 1; the vibration device also includes an elastic element 4, and the vibrator assembly is suspended in the cavity by the elastic element 4; the vibration device also includes a limit block 5, and the limit block 5 is fixedly connected to the inner bottom surface of the shell 1 near the permanent magnet 2, Figure 1 As shown, the vibrator assembly further includes a counterweight block 6, wherein a receiving cavity is provided in the counterweight block 6, and the permanent magnet 2 is provided in the receiving cavity. The counterweight block 6 is used to increase the inertia of the vibrator assembly to enhance the vibration sense, and the counterweight block 6 is made of a magnetic conductive material. The provision of the receiving cavity in the counterweight block 6 is conducive to the miniaturization and lightness of the vibration device. Figure 2As shown, along the direction perpendicular to the vibration direction of the vibrator assembly, one bottom surface of the counterweight 6 is recessed to form a first recessed area 61, and the other bottom surface of the counterweight 6 is recessed to form a second recessed area 62, the coil 3 is at least partially located in the first recessed area 61, and the limiting block 5 is at least partially located in the second recessed area 62; along the vibration direction of the vibrator assembly, the distance X between the limiting block 5 and the sidewall of the second recessed area 62 is less than the distance X1 between the coil 3 and the sidewall of the first recessed area 61.

[0038] The coil 3 is located in the magnetic field generated by the permanent magnet 2 and cuts the magnetic induction lines. When an alternating current signal is applied to the coil 3, the coil 3 and the permanent magnet 2 can interact to generate a Lorentz force. The permanent magnet 2 is used to form a magnetic field, and the permanent magnet 2 can be a ferrite magnet or a neodymium-iron-boron magnet. The shape of the permanent magnet 2 can be designed according to actual needs, as long as it is convenient for processing, such as a cuboid, a cylinder, a prism, etc. The vibrator assembly generates reciprocating motion under the action of the Lorentz force and the restoring force of the elastic element 4. The middle part of the coil 3 has a through hole, and the coil 3 is wound in one direction to form a closed ring structure. The surrounding of the through hole in the middle part is a wire area of the coil 3. The wire area refers to the area actually passed by the lead wire in the coil 3, and the entire wire area is annular.

[0039] In recent years, with the development trend of light and thin electronic products, various components inside the electronic products also need to adapt to this trend, and the vibration device is no exception. In order to realize the light and thin development of the vibration device, the designer needs to reduce the overall size of the vibration device, such as the height, as much as possible. Therefore, the vibrator assembly and the stator assembly, such as the coil, will interfere with each other in the direction of reciprocating vibration of the vibrator assembly. Specifically, at least a part of the coil 3 is located in the first recessed area 61 of the counterweight 6 in the vibrator assembly, that is, during the reciprocating vibration of the vibrator assembly, the coil will collide with the counterweight 6 of the vibrator assembly, which is easy to cause damage to the coil. Moreover, the coil will heat up after being electrified, and frequent collision between the coil and the counterweight 6 is more likely to cause damage to the internal structure of the vibration device, affecting the service life of the vibration device. In the vibration device provided in the embodiment of the present application, the limiting block 5 is arranged, and at least a part of the limiting block 5 is located in the second recessed area 62 of the counterweight 6. At the same time, along the direction of reciprocating vibration of the vibrator assembly, the distance X between the limiting block 5 and the sidewall of the second recessed area 62 is less than the distance X1 between the coil 3 and the sidewall of the first recessed area 61. Therefore, during the reciprocating vibration of the vibrator assembly, the limiting block 5 can block the collision between the coil 3 and the counterweight 6, which effectively avoids the damage to the coil and the vibrator assembly. By limiting the movement stroke of the vibration device, the internal structure of the vibration device is protected, and the service life of the vibration device is prolonged. The material of the limiting block 5 can be metal materials such as stainless steel and copper, and non-metal materials with large density and hardness.

[0040] One bottom surface of the weight block 6 is recessed to form a first recessed area 61, and the coil 3 is accommodated in the first recessed area 61. This arrangement is conducive to miniaturization and thinning of the vibration device, and is more in line with the development trend of thin and light electronic products in recent years. However, a problem is that the coil 3 collides with the side wall of the first recessed area 61 during reciprocating vibration of the vibrator assembly. In the embodiment, the other bottom surface of the weight block 6 is recessed to form a second recessed area 62, and the limiting block 5 is accommodated in the second recessed area 62. The distance X between the limiting block 5 and the side wall of the second recessed area 62 is less than the distance X1 between the coil 3 and the side wall of the first recessed area 61. Therefore, the limiting block 5 can prevent the coil 3 from colliding with the side wall of the first recessed area 61.

[0041] Referring to Figure 3 In one embodiment, the limiting block 5 is welded or bonded to the inner bottom surface of the shell 1 near the permanent magnet 2, and the limiting block 5 has a flat plate structure.

[0042] In the embodiment, the limiting block 5 and the shell 1 are separately arranged, and the limiting block 5 has a flat plate structure. This makes the forming process simple and convenient, and the bonding or welding operation of the limiting block 5 and the shell 1 is easier.

[0043] Referring to Figure 4 In one embodiment, the limiting block 5 is welded or bonded to the inner bottom surface of the shell 1 near the permanent magnet 2, and the limiting block 5 has a through hole in the middle.

[0044] In the embodiment, the limiting block 5 and the shell 1 are separately arranged, and the limiting block 5 has a structure with a through hole in the middle. This can effectively reduce the weight of the limiting block 5, thereby facilitating the thin and light design of the entire vibration device. The shape of the through hole in the limiting block 5 can be circular, rectangular, square, etc., and the present application does not make specific limitations in this regard.

[0045] Referring to Figure 5 In one embodiment, the limiting block 5 is welded or bonded to the inner bottom surface of the shell 1 near the permanent magnet 2, and the limiting block 5 has a protrusion in the middle. The inner bottom surface of the shell 1 near the permanent magnet 2 is provided with an opening, and the protrusion is matched and connected with the opening.

[0046] In the embodiment, the limiting block 5 and the shell 1 are separately arranged, and the limiting block 5 has a structure with a protrusion in the middle. The inner bottom surface of the shell 1 has an opening matched with the protrusion. In addition to bonding or welding, the limiting block 5 and the shell 1 are also connected by the protrusion and the opening. Therefore, the connection between the limiting block 5 and the shell 1 is more firm and reliable.

[0047] Referring toFigure 6 As shown in the figure, in one embodiment, the limiting block 5 is integrally formed with the shell 1, and the inner bottom surface of the shell 1 is recessed inward to form the limiting block 5.

[0048] In this embodiment, the limiting block 5 is integrally formed with the shell 1, for example, integrally injection molded, which can save the manufacturing and assembly process of the limiting block 5 and make the limiting block 5 more stable.

[0049] Reference Figure 1 , Figure 2 As shown in the figure, in one embodiment, the elastic element 4 is two V-shaped elastic sheets, and the two V-shaped elastic sheets are respectively located on the two sides of the weight block 6 along the vibration direction of the vibrator assembly. One side of the V-shaped elastic sheet is connected with the weight block 6, and the other side is connected with the inner side wall of the shell 1. It can be understood that the elastic element 4 is not limited to the V-shaped elastic sheet, but can also be an elastic rubber piece, a spring, etc. The elastic element 4 can generate damping and play a buffering role to provide a restoring force and a buffering effect for the reciprocating vibration of the vibrator assembly.

[0050] Reference Figure 1 , Figure 2 As shown in the figure, in one embodiment, the inner side of the open end of each V-shaped elastic sheet is connected with a stop block 7, and the stop block 7 can prevent the V-shaped elastic sheet from being over-pressed during vibration and can protect the V-shaped elastic sheet. In this embodiment, along the vibration direction of the vibrator assembly, the distance X2 between the two stop blocks 7 in each V-shaped elastic sheet is greater than the distance X between the limiting block 5 and the side wall of the second recessed area 62, so that the limiting block 5 can prevent the two stop blocks 7 in each V-shaped elastic sheet from colliding with each other during vibration, thereby more effectively protecting the V-shaped elastic sheet.

[0051] In one embodiment, a second stop block 7' is further arranged between each V-shaped elastic sheet and the inner side wall of the shell 1, and the second stop block 7' can prevent the V-shaped elastic sheet from colliding with the inner side wall of the shell 1 during vibration.

[0052] Reference Figure 1 As shown in the figure, in one embodiment, the permanent magnet 2 can include a first permanent magnet 21 located at the center and a second permanent magnet 22 located on both sides of the first permanent magnet 21, and the magnetization directions of the first permanent magnet 21 and the second permanent magnet 22 are perpendicular to each other, which is conducive to improving the magnetic field strength and the utilization efficiency of the magnetic field.

[0053] Reference Figure 1As shown, in one embodiment, the vibrator assembly further comprises a magnetic conductive plate 8 connected with the permanent magnet 2. The magnetic conductive plate 8 is made of magnetic conductive material, such as SUS-430. The magnetic conductive plate 8 has the effect of converging and concentrating the magnetic field generated by the permanent magnet 2, correcting and converging the magnetic induction lines emitted by the permanent magnet 2, thereby increasing the magnetic field strength and reducing the magnetic leakage.

[0054] Referring to Figure 1 As shown, in one embodiment, the vibration device further comprises an FPCB 9 connected with the coil 3. Specifically, the FPCB 9 is used for the coil 3 to be in conduction with the external circuit to transmit electrical signals. For example, the lead of the coil 3 is connected with the FPCB 9, and the FPCB 9 is connected with the master control chip. The arrangement of the FPCB 9 can make the signal transmission effect of the vibration device better and have a long service life.

[0055] Referring to Figure 1 As shown, in one embodiment, the shell 1 comprises an upper shell 11 and a lower shell 12, and optionally, the upper shell 11 is a cylindrical structure with one end open, the lower shell 12 is a plate-shaped structure and covers the open end of the upper shell 11, and the FPCB 9 is arranged at the inner surface of the lower shell 12. The shell 1 with such a structure is convenient to process and facilitates the installation of the stator assembly and the vibrator assembly. The shape of the entire shell 1 is cuboid, and of course, in other embodiments, the shape of the shell 1 can also be approximately cuboid, such as oval, racetrack-shaped, etc. The material of the shell 1 can be but is not limited to metal, plastic, ceramic, etc. In an optional embodiment, the upper shell 11 is made of magnetic conductive material, and the selection of the upper shell 11 made of magnetic conductive material can reduce the magnetic leakage.

[0056] Referring to Figure 7 , Figure 8 As shown, in one embodiment, the stator assembly further comprises a damping coil 10 arranged on the same side of the coil 3 and / or on the opposite side of the coil 3. The current direction of the damping coil 10 is opposite to that of the coil 3, and the damping coil 10 can hinder the vibration of the vibrator assembly, thereby producing a damping effect on the vibrator assembly, so that the starting and braking time of the vibration device is short, and the noise of the vibration device is reduced.

[0057] Referring to Figure 7 As shown, in one embodiment, the damping coil 10 arranged on the same side of the coil 3 is at least partially located in the first recessed area 61; along the vibration direction of the vibrator assembly, the distance between the limiting block 5 and the side wall of the second recessed area 62 is less than the distance between the damping coil 10 and the side wall of the first recessed area 61, so that the limiting block 5 can block the collision between the damping coil 10 and the counterweight 6.

[0058] Referring to Figure 8As shown, in one embodiment, a damping coil 10 is arranged on the opposite side of the coil 3, and the opposite bottom surface of the weight 6 has a third recessed area 63, and the damping coil 10 is at least partially arranged in the third recessed area 63; along the vibration direction of the vibrator assembly, the distance between the limiting block 5 and the sidewall of the second recessed area 62 is less than the distance between the damping coil 10 and the sidewall of the third recessed area 63, so that the limiting block 5 can block the damping coil 10 from colliding with the weight 6. One limiting block 5 can be arranged, or two limiting blocks 5 can be arranged, and the number of limiting blocks 5 is not limited by the present application.

[0059] Reference Figure 9 As shown, in one embodiment, a damping coil 10 is arranged on the opposite side of the coil 3, and the opposite bottom surface of the weight 6 has a third recessed area 63, and the damping coil 10 is at least partially arranged in the third recessed area 63; along the vibration direction of the vibrator assembly, the distance between the limiting block 5 and the sidewall of the second recessed area 62 is less than the distance between the damping coil 10 and the sidewall of the third recessed area 63, so that the limiting block 5 can block the damping coil 10 from colliding with the weight 6. One limiting block 5 can be arranged, or two limiting blocks 5 can be arranged, and the number of limiting blocks 5 is not limited by the present application.

[0060] Although some specific embodiments of the present application have been described in detail by way of example with reference to the drawings, it is to be understood that the examples are for illustrative purposes only and are not to be construed as limiting the scope of the present application. It is to be understood that modifications can be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A vibration device, characterized in that: include: A housing (1), wherein the housing (1) has a cavity; A vibrator assembly, the vibrator assembly being arranged in the cavity, the vibrator assembly comprising a permanent magnet (2) and a counterweight (6), the counterweight (6) being provided with a receiving cavity, and the permanent magnet (2) being arranged in the receiving cavity; A stator assembly is provided in the cavity, and the stator assembly includes a coil (3); the coil (3) and the permanent magnet (2) cause the vibrator assembly to vibrate back and forth through electromagnetic force; an elastic element (4), wherein the vibrator assembly is suspended in the cavity via the elastic element (4); A limit block (5) is fixedly connected to the inner bottom surface of the shell (1) close to the permanent magnet (2); along a direction perpendicular to the vibration direction of the vibrator assembly, one bottom surface of the counterweight block (6) is concave to form a first concave area (61), and the other bottom surface of the counterweight block (6) is concave to form a second concave area (62); the coil (3) is at least partially located in the first concave area (61), and the limit block (5) is at least partially located in the second concave area (62); along the vibration direction of the vibrator assembly, the distance between the limit block (5) and the side wall of the second concave area (62) is smaller than the distance between the coil (3) and the side wall of the first concave area (61).

2. The vibration device according to claim 1, characterized in that The limiting block (5) is welded or bonded to the inner bottom surface of the housing (1) close to the permanent magnet (2), and the limiting block (5) is a flat plate structure.

3. The vibration device according to claim 2, characterized in that The limiting block (5) is welded or bonded to the inner bottom surface of the housing (1) close to the permanent magnet (2), and a through hole is provided in the middle of the limiting block (5).

4. The vibration device according to claim 1, wherein The limit block (5) is welded or bonded to the inner bottom surface of the shell (1) near the permanent magnet (2); the middle portion of the limit block (5) has a protrusion; the inner bottom surface of the shell (1) near the permanent magnet (2) has a notch, and the protrusion is matched and connected with the notch.

5. The vibration device according to claim 1, wherein The limiting block (5) and the housing (1) are integrally formed, and the inner bottom surface of the housing (1) close to the permanent magnet (2) is recessed inward to form the limiting block (5).

6. The vibration device according to claim 1, wherein The elastic element (4) is two V-shaped spring pieces, and the two V-shaped spring pieces are respectively located on both sides of the counterweight (6) along the vibration direction of the vibrator assembly.

7. The vibration device according to claim 6, characterized in that A stopper (7) is connected to the inner side of the open end of each V-shaped spring piece, and along the vibration direction of the vibrator assembly, the distance between the two stoppers (7) in each V-shaped spring piece is greater than the distance between the limit block (5) and the side wall of the second recessed area (62).

8. The vibration device according to claim 1, wherein The stator assembly further comprises a damping coil (10), wherein the damping coil (10) is arranged on the same side of the coil (3) and / or on the opposite side of the coil (3).

9. The vibration device according to claim 8, characterized in that The damping coil (10) arranged on the same side of the coil (3) is at least partially located in the first recessed area (61); along the vibration direction of the vibrator assembly, the distance between the limit block (5) and the side wall of the second recessed area (62) is smaller than the distance between the damping coil (10) and the side wall of the first recessed area (61).

10. The vibration device according to claim 8, characterized in that A damping coil (10) is provided on the opposite side of the coil (3); a bottom surface of the counterweight (6) opposite to the coil (3) has a third recessed area (63); and the damping coil (10) is at least partially located in the third recessed area (63); along the vibration direction of the vibrator assembly, the distance between the limit block (5) and the side wall of the second recessed area (62) is smaller than the distance between the damping coil (10) and the side wall of the third recessed area (63).

11. The vibration device according to claim 1, wherein A damping frame (31) is provided on the outside of the coil (3); along the vibration direction of the vibrator assembly, the distance between the limit block (5) and the side wall of the second recessed area (62) is smaller than the distance between the damping frame (31) and the side wall of the first recessed area (61).

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