Linear vibration motor

Abstract

The invention relates to the technical field of motors, and provides a linear vibration motor which comprises a shell with a containing space, a vibrator assembly contained in the containing space, a stator assembly fixed in the shell and an elastic piece used for elastically suspending the vibrator assembly in the containing space, and the stator assembly and the vibrator assembly are spaced from each other; the elastic piece comprises a first fixing arm and a second fixing arm which are oppositely arranged, and an elastic arm, the first fixing arm is fixed to the shell, the second fixing arm is fixed to the vibrator assembly, the first fixing arm and the vibrator assembly are mutually spaced, and the second fixing arm and the shell are mutually spaced; the first fixing arm and the second fixing arm are both located on the same side of the vibrator assembly, the extending direction of the elastic arms is the direction of the connecting line of the first fixing arm and the second fixing arm, and all the elastic arms are parallel to each other and spaced in the direction perpendicular to the vibration direction of the vibrator assembly. Compared with the prior art, the linear vibration motor is good in overall consistency and excellent in vibration performance.

Description

Technical field

[0001] The present invention relates to the technical field of motors, and in particular to a linear vibration motor. [Background Technology]

[0002] With the advancement of electronic technology, portable consumer electronics are becoming increasingly popular, such as mobile phones, handheld game consoles, navigation devices, and handheld multimedia entertainment devices. These electronic products generally use vibration motors for system feedback, such as incoming call notifications, message notifications, navigation notifications on mobile phones, and vibration feedback on game consoles. Such a wide range of applications requires vibration motors with excellent performance and long service life.

[0003] The vibration motor of the related art includes a housing with a housing, a vibration unit housed in the housing, a coil unit fixed to the outside of the housing, and an elastic member for suspending the vibration unit in the housing. The coil unit drives the vibration unit to vibrate, and the elastic member provides a restoring force for the vibration unit. However, the elastic member is generally C-shaped or V-shaped, and these elastic members require bending, which results in large dimensional fluctuations and poor product consistency.

[0004] Therefore, it is necessary to provide a new linear vibration motor to solve the above problems. [Summary of the invention]

[0005] The technical problem to be solved by the present invention is to provide a linear vibration motor with good consistency and vibration effect.

[0006] To solve the above technical problems, an embodiment of the present invention provides a linear vibration motor, comprising a housing having a receiving space, a vibrator assembly received in the receiving space, a stator assembly fixed in the housing, and an elastic member for elastically suspending the vibrator assembly in the receiving space, wherein the stator assembly and the vibrator assembly are spaced apart from each other, and the stator assembly drives the vibrator assembly to vibrate;

[0007] The elastic member includes a first fixed arm and a second fixed arm arranged opposite to each other, and at least two elastic arms respectively fixedly connected between the first fixed arm and the second fixed arm, the first fixed arm is fixed to the shell, the second fixed arm is fixed to the vibrator assembly, the first fixed arm and the vibrator assembly are spaced apart from each other, and the second fixed arm and the shell are spaced apart from each other; the first fixed arm and the second fixed arm are both located on the same side of the vibrator assembly, the extension direction of the elastic arm is the direction of the line connecting the first fixed arm and the second fixed arm, and all the elastic arms are parallel to and spaced apart from each other along a vibration direction perpendicular to the vibrator assembly.

[0008] The ratio of the sum of the widths of the elastic arms at their minimum positions to the widths of the first fixed arm and the second fixed arm is 1:n, where n is greater than 1.

[0009] Preferably, the dimension of a single elastic arm at its maximum position is d2, the dimension of a single elastic arm at its minimum position is d1, and 0.2≤d1 / d2≤0.8.

[0010] Preferably, the angle between the first fixed arm and the elastic arm is 160°-180°.

[0011] Preferably, the widths of both sides of a single elastic arm gradually decrease toward the middle.

[0012] Preferably, the width of one side of a single elastic arm gradually decreases toward the middle.

[0013] Preferably, the elastic arms include at least three arranged in parallel;

[0014] Among the three elastic arms, the sizes of the two elastic arms located on the outermost sides are larger than the size of the elastic arm located in the middle; or, the elastic arms located on the outermost sides gradually decrease toward the middle only on one side, and the elastic arms located in the middle gradually decrease toward the middle on both sides.

[0015] Preferably, the linear vibration motor includes a first fixing block, wherein a side of the first fixing block away from the vibrator assembly is fixed to the housing, and a side of the first fixing block close to the vibrator assembly is fixed to the first fixing arm.

[0016] Preferably, the linear vibration motor further includes a first gasket, which is arranged opposite to the first fixing block, and is fixed to a side of the first fixing arm away from the first fixing block.

[0017] Preferably, the linear vibration motor includes a second fixing block, and a side of the second fixing block away from the vibrator assembly is fixed to the second fixing arm.

[0018] Preferably, the linear vibration motor further includes a damping member, one side of the damping member is fixed to a side of the vibrator assembly close to the elastic member, and the other side of the damping member is arranged to abut against the elastic arm of the elastic member.

[0019] Compared with the related art, in the linear vibration motor of the present invention, a stator assembly, a vibrator assembly and an elastic member are arranged in a shell, so that the stator assembly and the vibrator assembly are spaced apart from each other, and the stator assembly and the vibrator assembly are spaced apart from each other, and the vibrator assembly is driven to vibrate by the mutual driving of the stator assembly and the vibrator assembly; the elastic member includes a first fixed arm and a second fixed arm arranged opposite to each other, and at least two elastic arms respectively fixedly connected between the first fixed arm and the second fixed arm, the first fixed arm is fixed to the shell, the second fixed arm is fixed to the vibrator assembly, the first fixed arm and the vibrator assembly are spaced apart from each other, and the second fixed arm and the shell are spaced apart from each other; the first fixed arm and the second fixed arm are both located at On the same side of the vibrator assembly, the extension direction of the elastic arm is the connection direction of the first fixed arm and the second fixed arm, and all the elastic arms are parallel to and spaced apart from each other along a direction perpendicular to the vibration direction of the vibrator assembly; by arranging the first fixed arm and the second fixed arm in different planes; by adopting a "planar elastic part", the bending forming process is eliminated, which can greatly improve the consistency of the product; at the same time, the elastic arm includes at least two, and multiple elastic arms are arranged in parallel; thereby, the elastic arm is narrowed to reduce the stress of the spring under the drop load, and at the same time, by arranging multiple elastic arms in parallel, it is ensured that the overall stiffness of the elastic part remains unchanged and the elastic recovery effect is good.

Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0021] Figure 1 A schematic diagram of the three-dimensional structure of a linear vibration motor provided by an embodiment of the present invention;

[0022] Figure 2 An exploded schematic diagram of a linear vibration motor provided by an embodiment of the present invention;

[0023] Figure 3 For the Figure 1 Cross-sectional view along line AA;

[0024] Figure 4 For the Figure 1 Cross-sectional view along the midline BB;

[0025] Figure 5 A schematic structural diagram of an elastic member of a linear vibration motor provided by an embodiment of the present invention;

[0026] Figure 6 A schematic diagram of the angle structure of the elastic member of the linear vibration motor provided by an embodiment of the present invention;

[0027] Figure 7 A schematic diagram of the internal structure of a linear vibration motor provided by an embodiment of the present invention;

[0028] Figure 8 A schematic structural diagram of the elastic member of the linear vibration motor provided by an embodiment of the present invention from another perspective.

[0029] In the figure, 100, linear vibration motor, 1, shell, 11, bottom cover, 12, upper cover, 121, top wall, 122, side wall, 2, vibrator assembly, 21, mass block, 211, avoidance position, 22, magnet, 3, stator assembly, 4, elastic member, 41, first fixed arm, 42, second fixed arm, 43, elastic arm, 5, damping member, 6, first fixed block, 7, second fixed block, 8, circuit board, 81, circuit body, 82, conductive part, 9, first gasket. [Specific implementation method]

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] See also Figures 1-8 As shown, an embodiment of the present invention provides a linear vibration motor 100, comprising a housing 1 having a receiving space, a vibrator assembly 2 received in the receiving space, a stator assembly 3 fixed in the housing 1, and an elastic member 4 for elastically suspending the vibrator assembly 2 in the receiving space. The stator assembly 3 is spaced apart from the vibrator assembly 2, and the stator assembly 3 drives the vibrator assembly 2 to vibrate. The vibrator assembly 2 can vibrate back and forth along its vibration direction, and the elastic member 4 can provide a restoring force for the vibrator assembly 2.

[0032] The elastic member 4 includes a first fixed arm 41 and a second fixed arm 42 that are arranged opposite to each other, and at least two elastic arms 43 that are respectively fixedly connected between the first fixed arm 41 and the second fixed arm 42. The first fixed arm 41 is fixed to the housing 1, and the second fixed arm 42 is fixed to the vibrator assembly 2. The first fixed arm 41 and the vibrator assembly 2 are spaced apart from each other. The second fixed arm 42 is spaced apart from the housing 1. The first fixed arm 41 and the second fixed arm 42 are both located on the same side of the vibrator assembly 2. The elastic arms 43 extend in the direction of the line connecting the first fixed arm 41 and the second fixed arm 42. All the elastic arms 43 are parallel to each other and spaced apart along a direction perpendicular to the vibration direction of the vibrator assembly 2.

[0033] The ratio of the sum of the widths of the elastic arms 43 at their minimum positions to the widths of the first fixed arm 41 and the second fixed arm 42 is 1:n, where n is greater than 1.

[0034] In this embodiment, Figure 8 As shown, the dimension of a single elastic arm 43 at its maximum position is d2, and the dimension of a single elastic arm 43 at its minimum position is d1, with 0.2≤d1 / d2≤0.8. By optimizing different dimensions, different elastic properties can be adjusted to suit a variety of vibration motors. A more preferred range is 0.25≤d1 / d2≤0.7. Within this range, the smaller the d1 / d2 ratio, the stronger the motor's ability to suppress abnormal vibrations in the Z direction. Outside this range, the overall stiffness of the elastic member is insufficient, increasing the risk of breakage. The larger the d1 / d2 ratio, the greater the spring stiffness, and the weaker the motor's ability to suppress abnormal vibrations in the Z direction. Outside this range, the suppression effect is insufficient. In this embodiment, d1 = 0.18 mm, d2 = 0.6 mm, and d1 / d2 = 0.3. Arranging multiple elastic arms with these dimensions in parallel results in an elastic member with excellent resistance to drop deformation and good reliability.

[0035] In this embodiment, the angle between the first fixed arm 41 and the elastic arm 43 is 160°-180°. The larger the bending angle between the elastic arm 43 and the first fixed arm 41, the better the reliability of the elastic arm 43.

[0036] In this embodiment, the widths of both sides of the single elastic arm 43 gradually decrease toward the middle. This elastic arm shape has a strong ability to suppress abnormal vibration of the linear vibration motor 100 in the Z-axis direction.

[0037] In this embodiment, the width of one side of a single elastic arm 43 gradually decreases toward the middle.

[0038] In this embodiment, the elastic arms 43 include at least three arranged in parallel;

[0039] Among the three elastic arms 43, the two outermost elastic arms 43 are larger than the middle elastic arm 43; alternatively, the outermost elastic arms 43 taper toward the middle on only one side, while the middle elastic arm 43 tapers toward the middle on both sides. When the elastic arms 43 have different shapes, their minimum positions can be aligned or non-aligned for ease of installation.

[0040] In this embodiment, the first fixed arm 41, the elastic arm 43 and the second fixed arm 42 are located on the same plane. The first fixed arm 41 and the second fixed arm 42 are parallel to each other and perpendicular to the vibration direction. All the elastic arms 43 are parallel to each other and spaced apart.

[0041] The first fixed arm 41 of the elastic member 4 is fixed to the housing 1, and the second fixed arm 42 is fixed to the vibrator assembly 2. An elastic arm 43 connects the first fixed arm 41 and the second fixed arm 42. The stator assembly 3 drives the vibrator assembly 2 back and forth along its vibration direction, while the parallel elastic arms 43 provide a restoring force for the vibrator assembly 2. This positions the first fixed arm 41, the elastic arm 43, and the second fixed arm 42 on the same plane. By using a "planar elastic member," the bending process is eliminated, significantly improving product consistency.

[0042] Preferably, the elastic arm 43 includes four parallel elastic arms 43, and the number of elastic arms 43 can be determined according to the stress and stiffness of the elastic member 4. By providing two elastic arms 43, the elastic arms 43 are narrowed, thereby reducing the stress of the spring under a drop load. At the same time, by providing multiple elastic arms 43 in parallel, the overall stiffness of the elastic member 4 is ensured to remain unchanged, and the elastic recovery effect is good.

[0043] In this embodiment, the cross-sectional area of each elastic arm 43 gradually decreases from its ends toward the center. The narrowing of the elastic arms 43 reduces the stress of the spring under a drop load. Furthermore, the parallel arrangement of multiple elastic arms 43 further ensures that the overall stiffness of the elastic member 4 remains constant, improving the elastic recovery effect.

[0044] In this embodiment, there are two elastic members 4 and the two elastic members 4 are located on opposite sides of the vibrator assembly 2 along the vibration direction of the vibrator assembly 2. This can further improve the elastic restoring force of the vibrator assembly 2 during vibration.

[0045] In this embodiment, the elastic member 4 includes two elastic members 4 arranged opposite each other, one end of each elastic member 4 being fixed to the housing 1; the other ends of each elastic member 4 being fixed to opposite sides of the vibrator assembly 2. Providing two elastic members 4 further enhances the elastic restoring force of the vibrator assembly 2 during vibration.

[0046] In this embodiment, the linear vibration motor 100 includes a first fixing block 6. The side of the first fixing block 6 facing away from the vibrator assembly 2 is fixed to the housing 1, and the side of the first fixing block 6 facing closer to the vibrator assembly 2 is fixed to the first fixing arm 41. The first fixing block 6 improves the fixation of the first fixing arm 41 and increases the gap between the first fixing arm 41 and the housing 1, thereby improving the elastic recovery performance of the elastic member.

[0047] In this embodiment, the linear vibration motor 100 further includes a first gasket 9 , which is positioned opposite the first fixing block 6 and fixed to the side of the first fixing arm 41 away from the first fixing block 6 . The first gasket 9 corresponds to the first fixing block 6 and is used to sandwich and secure the first fixing arm 41, thereby increasing the stability of the first fixing arm 41 .

[0048] Optionally, the first gasket 9, the first fixing block 6 and the first fixing arm 41 are fixedly connected by welding.

[0049] In this embodiment, the linear vibration motor 100 includes a second fixing block 7. The side of the second fixing block 7 facing away from the vibrator assembly 2 is fixed to the second fixing arm 42. This improves the fixing performance between the second fixing arm 42 and the vibrator assembly 2. The second fixing block 7, the second fixing arm 42, and the vibrator assembly 2 are fixedly connected by welding.

[0050] In this embodiment, the linear vibration motor 100 further includes a damping member 5. One side of the damping member 5 is fixed to the side of the vibrator assembly 2 near the elastic member 4, and the other side of the damping member 5 is disposed in contact with the elastic arm 43 of the elastic member 4. The damping member 5 improves the damping performance between the vibrator assembly 2 and the elastic arm 43, thereby improving safety. Optionally, two damping members 5 are provided, located on opposite sides of the vibrator assembly 2, and respectively abutting the first elastic member 4 and the second elastic member 4.

[0051] In this embodiment, the vibrator assembly 2 includes a mass 21 fixed to the second fixed arm 42 and a magnet 22 fixed to the side of the mass 21 near the stator assembly 3. The damping member 5 is fixed to the side of the mass 21 near the elastic member 4. The stator assembly 3 is a drive coil fixed to the housing 1. The drive coil and the magnet 22 are arranged opposite and spaced apart from each other. When energized, the drive coil drives the magnet 22 to vibrate. The provision of the mass 21 increases the overall vibration weight, thereby improving the vibration performance of the vibrator assembly 2.

[0052] In this embodiment, the magnetic steel 22 is embedded and fixed in the mass block 21. This has a good fixing effect on the magnetic steel 22 and reduces the overall thickness of the mass block 21, saving installation space.

[0053] In this embodiment, the housing 1 includes a bottom cover 11 and an upper cover 12 fixed to the bottom cover 11. The stator assembly 3 is fixed to the side of the bottom cover 11 near the vibrator assembly 2. The upper cover 12 includes a top wall 121 and a side wall 122 formed by bending and extending the circumference of the top wall 121 toward the bottom cover 11. The first fixing arm 41 is fixed to the side wall 122. The bottom cover 11 is used to support and fix the stator assembly 3 and the upper cover 12. The side wall 122 of the upper cover 12 is used to mount and fix the first fixing arm 41 of the elastic member 4. When the drive coil drives the magnet 22 to vibrate, the elastic arm 43 achieves elastic recovery, resulting in good motor vibration performance.

[0054] In this embodiment, the side of the mass block 21 close to the bottom cover 11 is recessed away from the bottom cover 11 to form an escape portion 211. The drive coil is disposed in the escape portion 211, and the drive coil is spaced apart from the mass block 21. This facilitates the installation of the drive coil and saves space.

[0055] In this embodiment, the linear vibration motor 100 further includes a circuit board 8 , which is secured to the bottom cover 11 . The stator assembly 3 is secured to and electrically connected to the circuit board 8 . The circuit board 8 comprises a circuit body 81 secured to the bottom cover 11 and a conductive portion 82 extending from the side of the circuit body 81 away from the vibrator assembly 2 . The drive coil is stacked on and electrically connected to the circuit body 81 . The conductive portion 82 extends externally for connection to an external power source.

[0056] Optionally, the circuit board 8 is a flexible printed circuit (FPC), which is made of polyimide or polyester film as a substrate and is highly reliable and flexible. It has the characteristics of high wiring density, light weight, thin thickness, and good bendability.

[0057] In an optional embodiment of the present invention, the angle formed by the elastic arm 43 and the side of the first fixed arm 41 away from the vibrator assembly 2 is an obtuse angle; the angle formed by the elastic arm 43 and the side of the second fixed arm 42 close to the vibrator assembly 2 is an obtuse angle.

[0058] In this embodiment, the angles formed between the elastic arm 43 and the first fixed arm 41, and between the elastic arm 43 and the second fixed arm 42, are both greater than 170 degrees. This makes the elastic arm 43, the first fixed arm 41, and the second fixed arm 42 nearly planar. By using a "quasi-planar elastic member," the bending process is eliminated, significantly improving product consistency.

[0059] Even if multiple elastic arms 43 are arranged in parallel in this way, it is still difficult to reduce the stress of the elastic part 4 under impact loads such as falling, and the elastic part 4 is at risk of deformation due to falling. Therefore, a solution of "quasi-planar elastic part" is derived here. The two ends of this elastic part 4 and the stator assembly 3 and the vibrator assembly 2 are not located on the same plane, and there is a certain deviation. Compared with a completely "planar elastic part", the elastic part 4 requires a certain bending forming process, but the bending angle is much smaller than other C-type and V-type springs, the bending consistency is high, and the stress can also be greatly reduced.

[0060] Compared with the related art, in the linear vibration motor of the present invention, a stator assembly, a vibrator assembly and an elastic member are arranged in a shell, so that the stator assembly and the vibrator assembly are spaced apart from each other, and the stator assembly and the vibrator assembly are spaced apart from each other, and the vibrator assembly is driven to vibrate by the mutual driving of the stator assembly and the vibrator assembly; the elastic member includes a first fixed arm and a second fixed arm arranged opposite to each other, and at least two elastic arms respectively fixedly connected between the first fixed arm and the second fixed arm, the first fixed arm is fixed to the shell, the second fixed arm is fixed to the vibrator assembly, the first fixed arm and the vibrator assembly are spaced apart from each other, and the second fixed arm and the shell are spaced apart from each other; the first fixed arm and the second fixed arm are both located at On the same side of the vibrator assembly, the extension direction of the elastic arm is the connecting direction of the first fixed arm and the second fixed arm, and all the elastic arms are parallel to and spaced apart from each other along a direction perpendicular to the vibration direction of the vibrator assembly; by arranging the first fixed arm and the second fixed arm in different planes; by adopting a "planar elastic part", the bending forming process is eliminated, which can greatly improve the consistency of the product; at the same time, the elastic arm includes at least two, and the two elastic arms are arranged in parallel; thereby, the elastic arm is narrowed to reduce the stress of the spring under the drop load, and at the same time, by arranging multiple elastic arms in parallel, it is ensured that the overall stiffness of the elastic part remains unchanged and the elastic recovery effect is good.

[0061] The above description is only an embodiment of the present invention. It should be pointed out that those skilled in the art can make improvements without departing from the creative concept of the present invention, but these improvements all fall within the scope of protection of the present invention.

Claims

1. A linear vibration motor comprising a housing having a receiving space, a vibrator assembly received in the receiving space, a stator assembly fixed in the housing, and an elastic member for elastically suspending the vibrator assembly in the receiving space, wherein the stator assembly and the vibrator assembly are spaced apart from each other, and the stator assembly drives the vibrator assembly to vibrate; characterized in that: The elastic member includes a first fixed arm and a second fixed arm arranged opposite to each other, and at least two elastic arms respectively fixedly connected between the first fixed arm and the second fixed arm, the first fixed arm is fixed to the housing, the second fixed arm is fixed to the vibrator assembly, the first fixed arm and the vibrator assembly are spaced apart from each other, and the second fixed arm and the housing are spaced apart from each other; the first fixed arm and the second fixed arm are both located on the same side of the vibrator assembly, the elastic arms extend in a direction parallel to a line connecting the first fixed arm and the second fixed arm, and all the elastic arms are parallel to and spaced apart from each other along a direction perpendicular to the vibration direction of the vibrator assembly; The ratio of the sum of the widths of the elastic arms at their minimum positions to the widths of the first fixed arm and the second fixed arm is 1:n, where n is greater than 1.

2. The linear vibration motor according to claim 1, wherein The dimension of a single elastic arm at its maximum position is d2, the dimension of a single elastic arm at its minimum position is d1, and 0.2≤d1 / d2≤0.

8.

3. The linear vibration motor according to claim 1, wherein: The included angle between the first fixed arm and the elastic arm is 160°-180°.

4. The linear vibration motor according to claim 1, wherein The widths of both sides of a single elastic arm gradually decrease toward the middle.

5. The linear vibration motor according to claim 1, wherein: The width of one side of each elastic arm gradually decreases toward the middle.

6. The linear vibration motor according to claim 1, wherein: The elastic arms include at least three arranged in parallel; Among the three elastic arms, the sizes of the two elastic arms located on the outermost sides are larger than the size of the elastic arm located in the middle; or, the elastic arms located on the outermost sides gradually decrease toward the middle only on one side, and the elastic arms located in the middle gradually decrease toward the middle on both sides.

7. The linear vibration motor according to claim 1, wherein: The linear vibration motor includes a first fixing block, wherein a side of the first fixing block away from the vibrator assembly is fixed to the housing, and a side of the first fixing block close to the vibrator assembly is fixed to the first fixing arm.

8. The linear vibration motor according to claim 7, wherein: The linear vibration motor further includes a first gasket, which is arranged opposite to the first fixing block and is fixed to a side of the first fixing arm away from the first fixing block.

9. The linear vibration motor according to claim 1, wherein: The linear vibration motor includes a second fixing block, and a side of the second fixing block away from the vibrator assembly is fixed to the second fixing arm.

10. The linear vibration motor according to claim 1, wherein The linear vibration motor further includes a damping member, one side of which is fixed to a side of the vibrator assembly close to the elastic member, and the other side of which is arranged to abut against the elastic arm of the elastic member.

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