Vibration motor

Abstract

This invention provides a vibration motor. The vibration motor includes an insulating housing, a bidirectional coil, and a magnetic ring. The insulating housing is cylindrical, and at least three limiting protrusions are provided on the inner sidewall of the insulating housing. Each limiting protrusion extends parallel to the central axis of the insulating housing. The insulating housing includes a pair of end plates located at both ends of the insulating housing, and the end plates are made of insulating material. The bidirectional coil is housed within the insulating housing and spaced apart from the inner sidewall of the insulating housing. The magnetic ring is movably housed within the insulating housing, coaxially arranged with the insulating housing, and surrounds the bidirectional coil. The limiting protrusions are arranged adjacent to the magnetic ring and around the outer edge of the magnetic ring.

Description

Technical Field

[0001] This invention relates to vibration motors, and more particularly to a noise-reducing vibration motor. Background Technology

[0002] Current linear motors require a winding frame or two or more coils to achieve bipolar coils to excite the vibrator magnet to achieve repetitive motion. As linear motors become increasingly thinner, the effective space available inside these structures is decreasing, inevitably leading to wasted space, reduced winding space, or multiple output wires, which increases the difficulty of output wire management.

[0003] The older designs all used metal frames for the outer casing, with the vibrating magnet in a ring shape, and its centering typically relying on components such as a central post, spring, or elastic tabs. There were two configurations for the relative positions of the vibrating magnet and the coil. When the vibrating magnet was placed inside the coil, it was fitted onto a central post and slid along it to vibrate. This central post positioning method easily led to frictional noise from the moving parts during operation. When the coil was placed inside the vibrating magnet, since the vibrating magnet did not contact the outer casing laterally, springs or elastic tabs were needed along the axial direction of the magnet to hold it in place. Besides increasing material costs, the elastic components absorbed vibrations, reducing the intensity of the vibrations and thus decreasing the user's tactile experience. It also easily caused unintended lateral vibrations.

[0004] In view of this, the inventor has devoted himself to researching and applying theoretical principles to address the aforementioned problems in the prior art, which is the target of the inventor's improvement. Summary of the Invention

[0005] The purpose of this invention is to provide a noise-reducing vibration motor.

[0006] This invention provides a vibration motor comprising an insulating housing, a bidirectional coil, and a magnetic ring. The insulating housing is cylindrical, and at least three limiting protrusions are provided on its inner sidewall. Each limiting protrusion extends parallel to the central axis of the insulating housing. The insulating housing includes a pair of end plates, one end plate located at one end of the insulating housing and the other end plate located at the other end of the insulating housing, and the end plates are made of insulating material. The bidirectional coil is housed within the insulating housing and spaced apart from the inner sidewall of the insulating housing. The magnetic ring is movably housed within the insulating housing, coaxially arranged with the insulating housing, and surrounds the bidirectional coil. The limiting protrusions are arranged adjacent to the magnetic ring and around its outer edge.

[0007] The vibration motor of the present invention has an arc-shaped sidewall surface for each limiting protrusion.

[0008] The vibration motor of the present invention has a positioning pin disposed inside its insulating housing. The positioning pin is along the central axis of the insulating housing, and a bidirectional coil is sleeved on the positioning pin. The positioning pin and the insulating housing are integrally formed.

[0009] The vibration motor of the present invention has a bidirectional coil clamped between the opposite end plates.

[0010] The vibration motor of the present invention has an insulating housing containing an elastic ring. One side of the elastic ring has a plurality of protrusions, which protrude toward a magnetic ring. Each protrusion forms a cone. A portion of the protrusions contains multiple cones, and the height of some of the cones differs from the height of the remaining cones. The tip of each cone forms a flat surface.

[0011] The vibration motor of the present invention has a bidirectional coil comprising a first winding group and a second winding group coaxially stacked, wherein the winding directions of the first winding group and the second winding group are opposite. The vibration motor further includes a control circuit board electrically connected to both the first winding group and the second winding group. The first winding group is electrically connected to the second winding group.

[0012] The vibration motor of the present invention has a bidirectional coil whose outer edge is spaced apart from the inner edge of a magnetic ring. The two sides of the magnetic ring have opposite polarities.

[0013] The vibration motor of this invention has at least three limiting protrusions on the inner wall of its insulating housing to restrict the movement space of the magnetic ring, thereby limiting the magnetic ring to move only in the direction of the central axis. The limiting protrusions reduce the contact area between the magnetic ring and the positioning structure, thereby reducing friction and noise. Furthermore, its high positioning accuracy reduces the precision requirements of the components. Moreover, the bidirectional coil can be directly placed into the insulating housing without the need for separate insulation on the winding frame, thus reducing the number of parts and simplifying the assembly process. Attached Figure Description

[0014] Figure 1 This is an exploded perspective view of the vibration motor according to a preferred embodiment of the present invention.

[0015] Figure 2 This is a three-dimensional schematic diagram of a vibration motor according to a preferred embodiment of the present invention.

[0016] Figure 3 for Figure 2 A cross-sectional view.

[0017] Figure 4 and Figure 5 This is a longitudinal sectional view of the vibration motor in use according to a preferred embodiment of the present invention.

[0018] Figure 6 This is a partially enlarged view of the vibration motor according to a preferred embodiment of the present invention.

[0019] Figure 7 This is a schematic diagram illustrating the variation of the vibration motor according to a preferred embodiment of the present invention.

[0020] The attached figures are labeled as follows:

[0021] 100: Insulating casing

[0022] 101: Cylindrical body

[0023] 101a: End plate

[0024] 101b: End plate

[0025] 110: Limiting Protrusion

[0026] 120: Positioning pin

[0027] 200: Bidirectional coil

[0028] 210: First winding group

[0029] 220: Second winding group

[0030] 230: Control circuit board

[0031] 300: Magnetic ring

[0032] 400: Elastic Ring

[0033] 401: Gap

[0034] 410:convex part

[0035] 410a: Convex cone

[0036] 411a: Plane

[0037] 410b: Convex cone

[0038] 411b: Plane Detailed Implementation

[0039] See Figures 1 to 3 The first embodiment of the present invention provides a vibration motor, which includes an insulating housing 100, a bidirectional coil 200, a magnetic ring 300, and a control circuit board 230.

[0040] The insulating housing 100 is cylindrical, comprising a cylindrical body 101 and a pair of end plates 110a / 110b closing both ends of the cylindrical body 101. Preferably, one end plate 110b is integrally formed with one end of the cylindrical body 101, while the other end plate 110a is detachably disposed at the other end of the cylindrical body 101. At least three limiting protrusions 110 are protruding on the inner sidewall of the insulating housing 100, each limiting protrusion 110 extending parallel to the central axis of the insulating housing 100. Specifically, the plurality of limiting protrusions 110 protrude from the inner sidewall of the cylindrical body 101, and the sidewall surface of each limiting protrusion 110 is an arc surface. A positioning pin 120 is provided inside the insulating housing 100, the positioning pin 120 being configured and assembled inside the insulating housing 100 along the central axis of the insulating housing 100, and the positioning pin 120 and the insulating housing 100 can also be... Figure 7 As shown, it is molded as a single piece.

[0041] The bidirectional coil 200 is housed within the insulating housing 100 and spaced apart from the inner sidewall of the insulating housing 100. The bidirectional coil 200 is sleeved on the locating pin 120 and coaxially arranged with the insulating housing 100, and is fixed by being clamped between the opposing end plates 110a / 110b. Specifically, the bidirectional coil 200 includes a first winding group 210 and a second winding group 220 coaxially stacked, with the winding directions of the first winding group 210 and the second winding group 220 being opposite. This winding design eliminates the need for a winding frame, increasing winding space and embedding space, and effectively reducing the size of the vibration motor.

[0042] A magnetic ring 300 is movably housed within an insulating housing 100. The magnetic ring 300 is coaxially arranged with the insulating housing 100 and surrounds the bidirectional coil 200. The two sides of the magnetic ring 300 have opposite polarities. The inner edge of the magnetic ring 300 is spaced apart from the outer edge of the bidirectional coil 200, and a plurality of limiting protrusions 110 are arranged adjacent to the magnetic ring 300 and around its outer edge. The design of the limiting protrusions 110 allows the magnetic ring 300 to be positioned, while ensuring that the magnetic ring 300 can only move along the axial direction of the insulating housing 100.

[0043] The control circuit board 230 is electrically connected to the first winding group 210 and the second winding group 220, respectively. In this embodiment, the control circuit board 230 is preferably a flexible circuit board and is attached to the inner side of one of the end plates 110a. A portion of the control circuit board 230 extends through the insulating housing 100 for wiring.

[0044] The first winding group 210 and the second winding group 220 can be configured in parallel, and the control circuit board 230 is electrically connected to both the first winding group 210 and the second winding group 220 by two wires. That is, two winding wires are wound from the bidirectional coil 200 toward their respective ends in opposite winding directions (e.g., one is wound clockwise and the other is wound counterclockwise) to form the first winding group 210 and the second winding group 220, respectively. The first winding group 210 has a pair of wire ends connected to the control circuit board 230, and the second winding group 220 also has a pair of wire ends connected to the control circuit board 230.

[0045] However, the first winding group 210 and the second winding group 220 can also be configured in series, with the first winding group 210 electrically connected to the second winding group 220, and the control circuit board 230 electrically connected to both the first winding group 210 and the second winding group 220 by a single wire. That is, the winding wire is wound from the middle of the bidirectional coil 200 towards both ends in opposite winding directions (e.g., one end wound clockwise and the other end wound counterclockwise) to form the first winding group 210 and the second winding group 220 respectively. The first winding group 210 has a single wire end connected to the control circuit board 230, and the second winding group 220 also has a single wire end connected to the control circuit board 230. This single-winding design can also eliminate the need for a winding frame, and can also increase the winding space and the space for embedding the wire, thereby effectively reducing the size of the vibration motor.

[0046] An elastic ring 400 is disposed within the insulating housing 100. Multiple protrusions 410 are provided on one side of the elastic ring 400, and these protrusions 410 face the magnetic ring 300. Each protrusion 410 forms a cone 410a / 410b, which, compared to a completely flat design, better absorbs impact and reduces noise. The multiple protrusions 410 include multiple cones 410a / 410b, and the height of some of the cones 410a differs from the height of the remaining cones 410b. Gaps exist between the magnetic ring 300, the limiting protrusion 110, and the bidirectional coil 200, allowing for movement. The magnetic ring 300 will slightly sway during movement. By configuring cones 410a / 410b of different heights, the magnetic ring 300 can collide with the cones 410a / 410b in various states during movement, thus effectively absorbing impact and reducing noise. In addition, such as Figure 6 As shown, the tip of each cone 410a / 410b has a flat surface 411a / 411b to prevent the tip from being damaged by impact.

[0047] In this embodiment, a pair of identical elastic rings 400 are preferably provided inside the insulating shell 100, and each end plate 110a / 110b is provided with a groove (not shown in the figure) corresponding to the shape of the elastic ring 400, so that each elastic ring 400 can be respectively embedded in the groove of each end plate 110a / 110b, and the plurality of protrusions 410 on each elastic ring 400 protrude towards the magnetic ring 300 and are arranged facing each other. In addition, the elastic ring 400 provided on the same end plate 110a as the control circuit board 230 may also be provided with a notch 401 to allow the control circuit board 230 to pass through the insulating shell 100.

[0048] See Figure 4 and Figure 5 In this case, a bidirectional coil 200 is used to generate different magnetic poles for excitation, so that the magnetic ring 300 moves repeatedly in the closed insulating shell 100 to achieve the effect of vibration.

[0049] See Figures 1 to 3 This invention aims to reduce the precision requirements of parts and assembly by changing the positioning method of the magnetic ring 300. At least three limiting protrusions 110 are provided on the inner wall of the insulating shell 100 to restrict the movement space of the magnetic ring 300, thereby limiting the magnetic ring 300 to move only in the direction of the central axis. The accuracy of positioning the periphery by the limiting protrusions 110 is higher than that of positioning the center by the slide bar, thus reducing the precision requirements of the parts. Furthermore, the bidirectional coil 200 can be directly inserted into the insulating shell 100 without the need for separate insulation on the winding frame, and the positioning pin 120 can also be formed in the insulating shell 100, thereby reducing the number of parts and simplifying the assembly process.

[0050] In existing technology, the slider and the vibrating magnet are in surface contact; however, see [reference needed]. Figure 3 In this invention, the sidewall of the limiting protrusion 110 is arc-shaped, and when the magnetic ring 300 contacts the limiting protrusion 110, it makes line contact, thus reducing the contact area and consequently reducing friction and noise. (See reference...) Figure 2 and Figure 4 In this invention, an elastic ring 400 with a protrusion 410 is provided inside the insulating shell 100 as a buffer to effectively reduce noise caused by impact. Furthermore, the insulating shell 100, end plates 101a / 101b, elastic ring 400, and positioning pin 120 are all made of materials such as rubber or plastic, which not only effectively reduces material costs but also achieves the insulation effect without requiring additional insulation structures.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the patent scope of the present invention. Other equivalent variations that utilize the patent spirit of the present invention should all fall within the patent scope of the present invention.

Claims

1. A vibration motor, comprising: An insulating shell is cylindrical, and at least three limiting protrusions are provided on the inner sidewall of the insulating shell. Each limiting protrusion extends parallel to the central axis of the insulating shell. The insulating shell includes a pair of end plates, one of which is located at one end of the insulating shell and the other end plate is located at the other end of the insulating shell. The multiple end plates are made of insulating material. A bidirectional coil is housed within the insulating housing and spaced apart from the inner sidewall of the insulating housing; and A magnetic ring is movably housed within the insulating housing, the magnetic ring being coaxially configured with the insulating housing and surrounding the bidirectional coil. The plurality of the limiting protrusions are arranged adjacent to the magnetic ring and around the outer edge of the magnetic ring; The insulating shell contains an elastic ring, one side of which has multiple protrusions that protrude toward the magnetic ring. The plurality of protrusions include a plurality of cones, and the height of a portion of the plurality of cones is different from the height of the remaining plurality of cones.

2. The vibration motor as claimed in claim 1, wherein the sidewall surface of each of the limiting protrusions is an arc surface.

3. The vibration motor as claimed in claim 1, wherein a positioning pin is provided inside the insulating housing, the positioning pin is arranged along the central axis of the insulating housing, and the bidirectional coil is sleeved on the positioning pin.

4. The vibration motor as claimed in claim 3, wherein the locating pin is integrally formed with the insulating housing.

5. The vibration motor of claim 1, wherein the bidirectional coil is clamped between the opposite end plates.

6. The vibration motor as claimed in claim 1, wherein each of the protrusions forms a cone.

7. The vibration motor as claimed in claim 1 or 6, wherein the tip of each of the cones forms a flat surface.

8. The vibration motor of claim 1, wherein the bidirectional coil comprises a first winding group and a second winding group coaxially stacked, and the winding directions of the first winding group and the second winding group are opposite.

9. The vibration motor as claimed in claim 8 further includes a control circuit board, which is electrically connected to the first winding group and the second winding group respectively.

10. The vibration motor of claim 9, wherein the first winding group is electrically connected to the second winding group.

11. The vibration motor of claim 1, wherein the outer edge of the bidirectional coil is spaced apart from the inner edge of the magnetic ring.

12. The vibration motor of claim 1, wherein the two sides of the magnetic ring have opposite polarities.

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