Spring piece and linear motor

Abstract

The utility model provides a spring piece and a linear motor, the spring piece comprises a first spring part, a second spring part and a third spring part, the first spring part is connected with the second spring part through the third spring part, the first spring part and the second spring part are arranged in a staggered manner, and the third spring part is arranged as an inclined plate; the linear motor comprises spring pieces, a support, a machine shell and a mass block, the machine shell is fixed to the top wall of the support, the machine shell is hollow, and the two sides of the mass block are fixed to the machine shell through the spring pieces. Through the arrangement of the shape of the spring piece, the welding faces of the first spring part and the second spring part are located in different planes, direct welding is facilitated, the width of the tail of the spring piece is equal to the sum of the inclined projection distance of the third spring part and 2 * the material thickness, space occupation caused by bending arcs can be eliminated, the occupied size of the spring piece is effectively reduced, and the service life of the spring piece is prolonged. The possibility is provided for further reducing the size and the size of the linear motor, and the possibility is provided for improving the performance of the linear motor under the condition that the original size is not changed.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a spring sheet and a linear motor. Background Technology

[0002] Vibration motors are indispensable components in electronic products such as smartphones, tablets, and handheld game consoles, providing users with tactile feedback. As users increasingly demand thinner and lighter electronic products and a more tactile experience, OEMs are compressing the internal space of smartphones, tablets, and handheld game consoles, making the space reserved for motors increasingly tight. At the same time, they are required to meet or exceed the performance of previous motors.

[0003] Existing V-shaped springs are formed by continuously bending a single piece of material to create a V-shape, with the welding surfaces on the same horizontal plane. The spring tail is connected by an arc. Due to manufacturing limitations, the width of the spring tail is 2 * arc radius + 2 * material thickness, which occupies a significant amount of internal space in the motor. Figure 1 As shown, the spring welding surfaces are located in the same horizontal plane and need to be connected to the mass block and the housing indirectly (the welding points are on the top and outside of the housing) by means of welding of parts such as stops and pads. These parts occupy a large amount of space. Utility Model Content

[0004] The technical problem to be solved by this invention is how to reduce the space occupied by the spring.

[0005] This utility model solves the above-mentioned technical problems through the following technical means:

[0006] A spring sheet includes a first spring portion (61), a second spring portion (62), and a third spring portion (63). The first spring portion (61) is connected to the second spring portion (62) through the third spring portion (63). The first spring portion (61) and the second spring portion (62) are staggered, and the third spring portion (63) is provided as an inclined plate.

[0007] Beneficial effects: By setting the shape of the spring sheet, the welding surfaces of the first spring part and the second spring part are located in different planes and staggered, which facilitates direct welding (welding points are on the side). The width of the tail of the spring sheet = the inclined projection distance of the third spring part + 2 * material thickness, which can eliminate the space occupation caused by the bending arc, effectively reduce the volume occupied by the spring sheet, and provide the possibility for further reducing the size and volume of the linear motor. It also provides the possibility for improving the performance of the linear motor without changing the original volume.

[0008] Furthermore, the first spring part (61) and the second spring part (62) are integrally connected to the third spring part (63) by a smooth bend, and the top view of the spring sheet is V-shaped.

[0009] Beneficial effect: The smooth bending design reduces stress concentration and prevents the spring sheet from being damaged too quickly.

[0010] Furthermore, the spring sheet is made by cutting or punching stainless steel and then bending it.

[0011] Furthermore, a reinforcing part (64) is integrally fixed on the front side wall or the rear side wall or both the front side wall and the rear side wall of the third spring part (63).

[0012] Beneficial effects: By adding reinforcement, stress concentration can be further reduced, preventing the spring sheet from being damaged too quickly.

[0013] This utility model also discloses a linear motor including the spring sheet described in any of the above technical solutions, and further includes a bracket (1), a housing (2), and a mass block (7). The housing (2) is fixed on the top wall of the bracket (1). The housing (2) is hollow. Both sides of the mass block (7) are fixed to the housing (2) by spring sheets.

[0014] Beneficial effects: By setting spring plates on both sides of the mass block, the volume occupied by the spring plates is effectively reduced, which makes it possible to further reduce the size and volume of the linear motor, and also makes it possible to improve the performance of the linear motor without changing the original volume.

[0015] Furthermore, the bottom of the mass block (7) is provided with a stepped slot, and the mass block (7) is provided with a coil (4), a conductive metal sheet (5), and a magnet (8) from bottom to top.

[0016] Beneficial effects: By setting up a coil, conductive metal sheet, magnet, and mass block, the coil generates a periodic magnetic field. This magnetic field and the magnet produce an electromagnetic force that attracts (repels) each other, thereby pushing the mass block to move in the X direction. Under the action of the spring sheet, the mass block performs periodic simple harmonic motion. The simple harmonic motion of the mass block drives the motor and the motor-attached equipment to move, forming a vibration signal and providing the user with a vibration experience. After the coil stops generating the periodic magnetic field, the magnetic field generated by the magnet causes the conductive metal sheet to generate an eddy current field. The reaction force provided by the eddy current field cancels out the electromagnetic force generated by the magnet, thereby causing the mass block to stop quickly.

[0017] Furthermore, a first slot (71) is formed on the side of the mass block (7) near the coil (4) and the conductive metal sheet (5), and a second slot (72) is formed on the side of the mass block (7) near the magnet (8). The space of the first slot (71) is larger than that of the second slot (72). The coil (4) and the conductive metal sheet (5) are placed in the first slot (71) without contact, and at least one magnet (8) is fixed in the second slot (72).

[0018] Furthermore, the conductive metal sheet (5) is preferably a copper sheet.

[0019] Beneficial effects: Copper sheets have the best electrical conductivity, provide the greatest reaction force, and can stop the movement the fastest.

[0020] Furthermore, the bottom of the coil (4) is fixed to the output end of the flexible printed circuit board (3), the input end of the flexible printed circuit board (3) extends through the housing (2), and the bottom wall of the flexible printed circuit board (3) is fixed to the bracket (1).

[0021] Beneficial effects: By setting up a flexible printed circuit board, the two input pads at the input end of the flexible printed circuit board are connected to a sine wave generator, which loads a periodic sine wave signal onto the motor, and the coil connected to the flexible printed circuit board will generate a periodic magnetic field.

[0022] Furthermore, the coil (4) is provided with an input line (41) located inside the coil (4) and an output line (42) located outside the coil (4). The input line (41) is fixed to the first output pad (34) of the flexible printed circuit board (3), and the output line (42) is fixed to the second output pad (35) of the flexible printed circuit board (3). Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a vibration motor in the background art of this utility model;

[0024] Figure 2 This is a cross-sectional view of the linear motor according to Embodiment 1 of this utility model;

[0025] Figure 3 This is an assembly diagram of the bracket, coil, and flexible printed circuit board in the linear motor of Embodiment 1 of this utility model;

[0026] Figure 4 This is a bottom sectional view of a linear motor according to Embodiment 1 of this utility model;

[0027] Figure 5 This is a left sectional view of the linear motor according to Embodiment 1 of this utility model;

[0028] Figure 6 This is a side view of the planar spring in the linear motor of Embodiment 1 of this utility model. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] Example 1

[0031] like Figure 2 As shown, this embodiment provides a linear motor, including a bracket 1, a housing 2, a flexible printed circuit board 3, a coil 4, a conductive metal sheet 5, a spring sheet 6, a mass block 7, and a magnet 8.

[0032] like Figure 2 , Figure 3 As shown, a housing 2 is fixed on the top wall of the bracket 1. The housing 2 is hollow. The bracket 1 is square. Both the bracket 1 and the housing 2 are made of stainless steel. A flexible printed circuit board 3 is fixed on the top wall of the bracket 1. The input end of the flexible printed circuit board 3 extends out of the housing 2. A coil 4 is fixed on the output end of the flexible printed circuit board 3. Specifically, an input line 41 is provided on the inner side of the coil 4, and an output line 42 is provided on the outer side of the coil 4. The input line 41 is fixed to the first output pad 34 of the flexible printed circuit board 3, and the output line 42 is fixed to the second output pad 35 of the flexible printed circuit board 3.

[0033] like Figure 2 As shown, a conductive metal sheet 5 is fixed on the top wall of the coil 4, preferably a copper sheet; both sides of the mass block 7 are fixed to the housing 2 by spring sheets 6; the bottom of the mass block 7 has a stepped slot, and the coil 4, conductive metal sheet 5, and magnet 8 are arranged sequentially from bottom to top inside the mass block 7. A first slot 71 is opened on the side of the mass block 7 near the coil 4 and conductive metal sheet 5, and a second slot 72 is opened on the side of the mass block 7 near the magnet 8. The space of the first slot 71 is larger than that of the second slot 72. The coil 4 and conductive metal sheet 5 are placed in the first slot 71 without contact. At least one magnet 8 is fixed in the second slot 72. In this embodiment, two magnets 8 are fixed along the X-axis in the second slot 72. In this embodiment, the magnet 8 is made of neodymium iron boron, and the mass block 7 is made of tungsten alloy.

[0034] like Figure 4 , Figure 5 , Figure 6As shown, the spring sheet 6 includes a first spring portion 61, a second spring portion 62, and a third spring portion 63. The first spring portion 61 is connected to the second spring portion 62 via the third spring portion 63. The first spring portion 61 and the second spring portion 62 are staggered, and the third spring portion 63 is an inclined plate. The first spring portion 61 and the second spring portion 62 are both integrally connected to the third spring portion 63 by a smooth bend, which reduces stress concentration. In this embodiment, the spring sheet 6 is made by cutting or punching stainless steel and then bending it. The top view of the spring sheet 6 is V-shaped, and the width of the tail of the spring sheet 6 is equal to the inclination of the third spring portion 63. The distance between the shadow and the material thickness is 2 * the material thickness, which can eliminate the space occupation caused by the bending arc and effectively reduce the volume occupied by the spring sheet. The welding surfaces of the first spring part 61 and the second spring part 62 are located in different planes and are staggered to facilitate direct welding (welding points are on the side). The shape of the spring sheet 6 makes it possible to further reduce the size and volume of the linear motor, and also makes it possible to improve the performance of the linear motor without changing the original volume. In order to reduce stress concentration and prevent the spring sheet 6 from being damaged too quickly, a reinforcing part 64 is integrally fixed on the front side wall or the rear side wall or both the front side wall and the rear side wall of the third spring part 63.

[0035] In use, the two input pads at the input end of the flexible printed circuit board 3 are connected to the sine wave generator to load a periodic sine wave signal onto the motor. The coil 4 connected to the flexible printed circuit board 3 generates a periodic magnetic field. This magnetic field generates an electromagnetic force that attracts (repels) the magnet 8, thereby pushing the mass block 7 to move in the X direction. Under the action of the spring plate 6, the mass block 7 performs a periodic simple harmonic motion. The simple harmonic motion of the mass block 7 drives the motor and the motor-attached equipment to move, forming a vibration signal to provide the user with a vibration experience. After the sine wave generator is removed, the magnetic field generated by the magnet 8 causes the conductive metal plate 5 to generate an eddy current field. The reaction force provided by the eddy current field cancels out the electromagnetic force that attracts (repels) the magnet 8, thereby causing the mass block 7 to stop quickly. Without the conductive metal plate 5, it takes 5 seconds to stop, but with the conductive metal plate 5, it only takes 0.5 seconds to stop.

[0036] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A spring sheet, characterized in that, It includes a first spring part (61), a second spring part (62), and a third spring part (63). The first spring part (61) is connected to the second spring part (62) through the third spring part (63). The first spring part (61) and the second spring part (62) are staggered, and the third spring part (63) is set as an inclined plate.

2. The spring sheet according to claim 1, characterized in that: The first spring section (61) and the second spring section (62) are integrally connected to the third spring section (63) by a smooth bend, and the top view of the spring sheet is V-shaped.

3. The spring sheet according to claim 1, characterized in that: Spring sheets are made by cutting or punching stainless steel and then bending it.

4. The spring sheet according to claim 1, characterized in that: A reinforcing part (64) is integrally fixed on the front or rear side wall or both the front and rear side walls of the third spring part (63).

5. A linear motor, characterized in that: The device includes the spring sheet as described in any one of claims 1-4, and also includes a bracket (1), a housing (2), and a mass block (7). The housing (2) is fixed on the top wall of the bracket (1). The housing (2) is hollow. Both sides of the mass block (7) are fixed to the housing (2) by spring sheets.

6. The linear motor according to claim 5, characterized in that: The bottom of the mass block (7) has a stepped slot, and the mass block (7) contains a coil (4), a conductive metal sheet (5), and a magnet (8) arranged from bottom to top.

7. The linear motor according to claim 6, characterized in that: A first slot (71) is opened on the side of the mass block (7) near the coil (4) and the conductive metal sheet (5), and a second slot (72) is opened on the side of the mass block (7) near the magnet (8). The space of the first slot (71) is larger than that of the second slot (72). The coil (4) and the conductive metal sheet (5) are placed in the first slot (71) without contact, and at least one magnet (8) is fixed in the second slot (72).

8. The linear motor according to claim 6, characterized in that: The conductive metal sheet (5) is a copper sheet.

9. The linear motor according to claim 6, characterized in that: The bottom of the coil (4) is fixed on the output end of the flexible printed circuit board (3), the input end of the flexible printed circuit board (3) extends through the housing (2), and the bottom wall of the flexible printed circuit board (3) is fixed on the bracket (1).

10. The linear motor according to claim 9, characterized in that: The coil (4) has an input line (41) located inside the coil (4) and an output line (42) located outside the coil (4). The input line (41) is fixed to the first output pad (34) of the flexible printed circuit board (3), and the output line (42) is fixed to the second output pad (35) of the flexible printed circuit board (3).

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