Method for adjusting resonant frequency of vibrator

Abstract

The invention discloses a method for adjusting the resonant frequency of a vibrator, the vibrator comprises a supporting seat, an elastic sheet, a magnetic rotor and a magnetic stator, the magnetic rotor and the magnetic stator are matched with each other, the elastic sheet is fixed on the supporting seat, the magnetic rotor is fixed on the elastic sheet, and the magnetic stator is fixed on the supporting seat; the adjusting method comprises the step of adjusting the resonant frequency F0 of the vibrator by changing at least one of the geometric parameters of the magnetic rotor, the material parameters of the elastic pieces and the geometric parameters of the elastic pieces. According to the method for adjusting the resonant frequency of the vibrator provided by the embodiment of the invention, the resonant frequency F0 of the vibrator is adjusted by adjusting multiple influence factors, so that the resonant frequency F0 is adjusted more simply and quickly, and the time cost and the money cost for adjustment are reduced.

Description

Technical Field

[0001] This application relates to the field of vibration devices, and more particularly, to a method for adjusting the resonance frequency of a vibrator. Background Art

[0002] The resonance frequency of a vibrator is related to the stiffness and mass of the structure of the vibrator. In the prior art, the resonance frequency of the vibrator is adjusted by changing the structure of the leaf spring and the weight of the vibrator. This adjustment method mainly involves repeated adjustment through modal analysis simulation after changing the structure of the leaf spring or the weight of the vibrator. The adjustment process is relatively cumbersome and not completely cause-oriented. Summary of the Invention

[0003] An embodiment of this application provides a method for adjusting the resonance frequency of a vibrator. The vibrator includes a support base, a leaf spring, a magnetic mover and a magnetic stator that cooperate with each other. The leaf spring is fixed to the support base, and the magnetic mover is fixed to the leaf spring. The magnetic stator is fixed to the support base;

[0004] The adjustment method includes adjusting the resonance frequency F0 of the vibrator by changing at least one of the geometric parameters of the magnetic mover, the material parameters of the leaf spring, and the geometric parameters of the leaf spring.

[0005] In some exemplary embodiments, the leaf spring includes a mounting plate, a spring arm and a fixing portion. The magnetic mover is fixed to the mounting plate. The spring arm extends circumferentially along the mounting plate, and both ends of the spring arm are respectively connected to the edge of the mounting plate and the fixing portion. The fixing portion is fixed to the support base;

[0006] The geometric parameter of the leaf spring includes the angle θ at which the spring arm extends circumferentially along the mounting plate, and the angle θ is negatively correlated with the resonance frequency F0 of the vibrator;

[0007] The adjustment method includes:

[0008] By increasing the angle θ, the resonance frequency F0 of the vibrator is decreased;

[0009] By decreasing the angle θ, the resonance frequency F0 of the vibrator is increased.

[0010] In some exemplary embodiments, the resonance frequency F0 of the vibrator satisfies the following formula:

[0011] F0 = a × e -bθ ,

[0012] where a and b are constants, and the range of the angle θ is 30° to 120°.

[0013] In some exemplary embodiments, the geometric parameters of the elastic piece include the thickness t of the elastic piece, and the thickness t of the elastic piece is positively correlated with the resonance frequency F0 of the vibrator;

[0014] The adjustment method includes:

[0015] By increasing the thickness t of the elastic piece, the resonance frequency F0 of the vibrator is increased;

[0016] By decreasing the thickness t of the elastic piece, the resonance frequency F0 of the vibrator is decreased.

[0017] In some exemplary embodiments, the elastic piece includes a mounting plate, elastic arms and fixing parts. The magnetic mover is fixed to the mounting plate. The elastic arms extend along the circumferential direction of the mounting plate, and both ends of the elastic arms are respectively connected to the edge of the mounting plate and the fixing parts. The fixing parts are fixed to the support seat;

[0018] The geometric parameters of the elastic piece include the width d of the elastic arm along the radial direction of the mounting plate, and the width d of the elastic arm is negatively correlated with the resonance frequency F0 of the vibrator;

[0019] The adjustment method includes:

[0020] By increasing the width d of the elastic arm, the resonance frequency F0 of the vibrator is decreased;

[0021] By decreasing the width d of the elastic arm, the resonance frequency F0 of the vibrator is increased.

[0022] In some exemplary embodiments, the elastic piece includes a mounting plate, a plurality of elastic arms and a plurality of fixing parts. The magnetic mover is fixed to the mounting plate. The elastic arms extend along the circumferential direction of the mounting plate, and the plurality of elastic arms and the plurality of fixing parts are both rotationally symmetric structures around the central axis of the mounting plate. One ends of the plurality of elastic arms are all connected to the edge of the mounting plate, and the other ends of the plurality of elastic arms are respectively connected to the plurality of fixing parts in one-to-one correspondence. The plurality of fixing parts are all fixed to the support seat;

[0023] The geometric parameters of the elastic piece include the minimum distance r between the fixing part and the center of the mounting plate, and the minimum distance r is negatively correlated with the resonance frequency F0 of the vibrator;

[0024] The adjustment method includes:

[0025] By increasing the minimum distance r, the resonance frequency F0 of the vibrator is decreased;

[0026] By decreasing the minimum distance r, the resonance frequency F0 of the vibrator is increased.

[0027] In some exemplary embodiments, the material parameters of the elastic piece include the elastic modulus of the elastic piece, and the elastic modulus of the elastic piece is positively correlated with the resonance frequency F0 of the vibrator;

[0028] The adjustment method includes:

[0029] By increasing the elastic modulus of the elastic piece, the resonance frequency F0 of the vibrator is increased;

[0030] By decreasing the elastic modulus of the elastic piece, the resonance frequency F0 of the vibrator is decreased.

[0031] In some exemplary embodiments, the geometric parameters of the magnetic mover include at least one of the outer diameter D of the magnetic mover and the thickness T of the magnetic mover, and the outer diameter D of the magnetic mover is negatively correlated with the resonance frequency F0 of the vibrator, and the thickness T of the magnetic mover is negatively correlated with the resonance frequency F0 of the vibrator;

[0032] The adjustment method includes:

[0033] By increasing at least one of the outer diameter D of the magnetic mover and the thickness T of the magnetic mover, the resonance frequency F0 of the vibrator is decreased;

[0034] By decreasing at least one of the outer diameter D of the magnetic mover and the thickness T of the magnetic mover, the resonance frequency F0 of the vibrator is increased.

[0035] In some exemplary embodiments, the elastic piece includes a mounting plate, a plurality of elastic arms and a plurality of fixing parts, the magnetic mover is fixed to the mounting plate, the elastic arms extend along the circumferential direction of the mounting plate, and the plurality of elastic arms and the plurality of fixing parts are both rotationally symmetric structures around the central axis of the mounting plate. One ends of the plurality of elastic arms are all connected to the edge of the mounting plate, the other ends of the plurality of elastic arms are respectively connected to the plurality of fixing parts in one-to-one correspondence, and the plurality of fixing parts are all fixed to the support seat;

[0036] The geometric parameters of the elastic piece include the angle θ of the elastic arm extending along the circumferential direction of the mounting plate, the thickness t of the elastic piece, the width d of the elastic arm along the radial direction of the mounting plate, and the minimum distance r between the fixing part and the center of the mounting plate;

[0037] The material parameters of the elastic piece include the elastic modulus of the elastic piece;

[0038] The geometric parameters of the magnetic mover include the outer diameter D of the magnetic mover and the thickness T of the magnetic mover;

[0039] The resonance frequency F0 of the vibrator satisfies:

[0040]

[0041] Among them, k1 - k5 are coefficient constants, and k2 > k1 > 0, k3 < k4 < k5 < 0, |k2| > |k1| > |k3| > |k4| > |k5|;

[0042] C1 and C2 are constants;

[0043] K1 is a material coefficient, related to the elastic modulus and density of the elastic piece. The greater the elastic modulus of the elastic piece, the greater K1; the smaller the density of the elastic piece, the greater K1;

[0044] K2 is a fixed coefficient, related to the position of the fixed part. The greater the minimum distance r, the smaller K2.

[0045] In some exemplary embodiments, |k1| is at least one order of magnitude greater than |k3| by 10e5.

[0046] The method for adjusting the resonance frequency of the vibrator in the embodiments of the present application comprehensively analyzes various influencing factors of the resonance frequency F0 of the vibrator, adjusts the resonance frequency F0 of the vibrator by adjusting various influencing factors, and is convenient for tracing the results, making the adjustment of the resonance frequency F0 simpler and faster, reducing the time cost and money cost for adjustment, and can conveniently design the resonance frequency F0 that meets various usage requirements.

[0047] Other features and advantages of the present application will be described in the subsequent specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The drawings are used to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solutions of the present application, and do not constitute a limitation to the technical solutions of the present application.

[0049] Figure 1 is a three - dimensional structural schematic diagram of a vibrator according to some embodiments of the present application;

[0050] Figure 2 is Figure 1 a disassembled structural schematic diagram of the vibrator;

[0051] Figure 3 is Figure 1 a structural schematic diagram of the support base of the vibrator;

[0052] Figure 4 is Figure 1 a structural schematic diagram of the elastic piece of the vibrator;

[0053] Figure 5 is a curve graph showing the relationship between the resonance frequency of the vibrator and the angle θ of the elastic arm;

[0054] Figure 6 Schematic structural diagram of the shrapnel of the vibrator according to some other embodiments of the present application;

[0055] Figure 7 Schematic structural diagram of the shrapnel of the vibrator according to still some other embodiments of the present application;

[0056] Figure 8 Bottom view structural diagram of the touch control module equipped with a vibrator according to some embodiments of the present application;

[0057] Figure 9 Cross-sectional structural diagram of the touch control module equipped with a vibrator according to some embodiments of the present application.

[0058] Reference numerals:

[0059] 100 - Vibrator; 1 - Shrapnel, 11 - Mounting plate, 12 - Shrapnel arm, 13 - Fixing part; 2 - Magnetic mover; 3 - Support base, 31 - Metal insert, 32 - Injection molding part; 4 - Flexible circuit board; 5 - Magnetic stator; 6 - Fixing position; 7 - Colloid; 8 - Back glue; 9 - Control board; 10 - Touch control substrate. Detailed implementation manners

[0060] To make the objectives, technical solutions and advantages of the present application clearer and more understandable, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0061] The embodiments of the present application provide a method for adjusting the resonance frequency of a vibrator. As Figures 1 - 3 shown, the vibrator 100 includes a support base 3, a shrapnel 1, a magnetic mover 2 and a magnetic stator 5 that cooperate with each other. The shrapnel 1 is fixed to the support base 3, and the magnetic mover 2 is fixed to the shrapnel 1, and the magnetic stator 5 is fixed to the support base 3. The magnetic mover 2 can be a permanent magnet material, for example, it can be a magnet, and the magnetic stator 5 can be an electromagnetic coil. When the electromagnetic coil is energized, an electromagnetic field is generated, which interacts with the magnetic field generated by the magnetic mover 2, drives the magnetic mover 2 to move, and causes the shrapnel 1 to undergo elastic deformation, so that the magnetic mover 2 vibrates. Of course, the magnetic mover 2 can also be an electromagnetic coil, and the magnetic stator 5 can also be a permanent magnet material, for example, it can be a magnet; or, both the magnetic mover 2 and the magnetic stator 5 can be electromagnetic coils.

[0062] The shrapnel 1 can be connected to the magnetic mover 2 and the support base 3. The magnetic mover 2 can be adhesively fixed to the shrapnel 1. The shrapnel 1 and the magnetic mover 2 can jointly form a vibration part. When the magnetic mover 2 is under force, it will drive the shrapnel 1 to vibrate together. Therefore, the magnetic mover 2 and the shrapnel 1 jointly determine the resonance frequency of the vibrator.

[0063] By adjusting the resonance frequency of the vibrator, vibrations with different effects can be achieved to meet the usage requirements in specific scenarios. For example, when the vibrator is used in a touch feedback module, by adjusting the resonance frequency of the vibrator, vibration feedback with different effects can be achieved, enhancing the user's experience of vibration feedback. The method for adjusting the resonance frequency of the vibrator 100 in the embodiments of the present application includes adjusting the resonance frequency F0 of the vibrator 100 by changing at least one of the geometric parameters of the magnetic mover 2, the material parameters of the elastic piece 1, and the geometric parameters of the elastic piece 1.

[0064] The embodiments of the present application comprehensively analyze various influencing factors of the resonance frequency F0 of the vibrator 100, and adjust the resonance frequency F0 of the vibrator 100 by adjusting various influencing factors, making it easier to adjust the resonance frequency F0, reducing the time for adjustment, and conveniently designing the resonance frequency F0 that meets various usage requirements.

[0065] In some exemplary embodiments, such as Figure 2 、 Figure 4 and Figures 6 - 7 shown, the elastic piece 1 includes a mounting plate 11, elastic arms 12, and a fixing portion 13. The magnetic mover 2 is fixed to the mounting plate 11. The elastic arms 12 extend along the circumference of the mounting plate 11, and both ends of the elastic arms 12 are respectively connected to the edge of the mounting plate 11 and the fixing portion 13. The fixing portion 13 is fixed to the support base 3. The elastic arms 12 can be arc-shaped arms, and the mounting plate 11 can be a circular plate. The magnetic mover 2 can be a cylindrical magnet and is bonded to one side of the mounting plate 11 close to the magnetic stator 5. Both the elastic arms 12 and the fixing portion 13 can be provided with multiple (two or more). The multiple elastic arms 12 and the multiple fixing portions 13 can be rotationally symmetric about the central axis of the mounting plate 11 (perpendicular to the plate surface of the mounting plate 11). One end of each of the multiple elastic arms 12 is connected to the edge of the mounting plate 11, and the other ends of the multiple elastic arms 12 are respectively connected to the multiple fixing portions 13 in one-to-one correspondence. The multiple fixing portions 13 are all fixed to the support base 3.

[0066] As Figure 4 and Figures 6 - 7 shown, the geometric parameters of the elastic piece 1 include the angle θ that the elastic arm 12 extends along the circumference of the mounting plate 11 (extends around the central axis of the mounting plate 11), and the angle θ is negatively correlated with the resonance frequency F0 of the vibrator 100. θ is the central angle formed by the elastic arm 12 with respect to the center of the mounting plate 11, and its range is from the connection of the elastic arm 12 and the mounting plate 11 to the connection of the elastic arm 12 and the fixing portion 13. Here, the angle θ is referred to as the elastic arm angle θ. The larger the elastic arm angle θ, the smaller the resonance frequency F0.

[0067] The method for adjusting the resonance frequency of the vibrator 100 includes: by increasing the elastic arm angle θ, to decrease the resonance frequency F0 of the vibrator 100; by decreasing the elastic arm angle θ, to increase the resonance frequency F0 of the vibrator 100.

[0068] In some exemplary embodiments, the cantilever arm angle θ and the resonance frequency F0 of the vibrator 100 satisfy an exponential relationship as shown in the following formula (1):

[0069] F0 = a×e -bθ (1)

[0070] where a and b are constants, and the range of the cantilever arm angle θ is from 30° to 120°.

[0071] In one exemplary embodiment, as Figure 2 and Figure 4 shown, when the material of the elastic piece 1 is SUS301, the thickness t of the elastic piece 1 = 0.3 mm, the width d of the cantilever arm 1 = 1 mm, the thickness T of the magnetic mover 2 = 0.8 mm, and the diameter D of the magnetic mover 2 = 12 mm, the relationship between F0 and θ is as shown in formula (2):

[0072] F0 = 1018e -0.011θ (30° ≤θ≤120° ) (2)

[0073] Figure 5 The graph of the resonance frequency F0 of the vibrator 100 with respect to the cantilever arm angle θ is shown. It can be seen that the smaller the cantilever arm angle θ, the higher the change rate of the resonance frequency F0; the larger the cantilever arm angle θ, the lower the change rate of the resonance frequency F0. By changing the cantilever arm angle θ, a wide range of resonance frequency F0 values can be obtained, and changing the cantilever arm angle θ is more manufacturable. Therefore, changing the cantilever arm angle θ can be used as the main means to adjust the resonance frequency F0. Changing the cantilever arm angle θ can finely adjust the resonance frequency F0. It should be noted that the above formula (2) is for the vibrator 100 with two cantilever arms 12 in the embodiments of the present application.

[0074] In some exemplary embodiments, as Figure 2 shown, the geometric parameters of the elastic piece 1 include the thickness t of the elastic piece 1, and the thickness t of the elastic piece 1 is positively correlated with the resonance frequency F0 of the vibrator. The thicker the elastic piece 1, the larger the resonance frequency F0.

[0075] The method for adjusting the resonance frequency of the vibrator 100 includes: increasing the resonance frequency F0 of the vibrator 100 by increasing the thickness t of the elastic piece 1; decreasing the resonance frequency F0 of the vibrator 100 by decreasing the thickness t of the elastic piece 1.

[0076] Changing the thickness t of the elastic piece 1 can coarsely adjust the resonance frequency F0 and expand the coverage range of the resonance frequency F0. The resonance frequency F0 can be between 0 - 1000 Hz.

[0077] For example, for the vibrator 100 with the width d of the elastic arm 12 being 1 mm, the diameter D of the magnetic mover 2 being 12 mm, and the thickness T of the magnetic mover 2 being 0.8 mm, when the thickness t of the elastic piece 1 is 0.4 mm, the resonance frequency F0 ranges between 380 - 1070 Hz; when the thickness t of the elastic piece 1 is 0.35 mm, the resonance frequency F0 ranges between 320 - 900 Hz; when the thickness t of the elastic piece 1 is 0.3 mm, the resonance frequency F0 ranges between 250 - 730 Hz; when the thickness t of the elastic piece 1 is 0.25 mm, the resonance frequency F0 ranges between 200 - 580 Hz; when the thickness t of the elastic piece 1 is 0.2 mm, the resonance frequency F0 ranges between 150 - 430 Hz; when the thickness t of the elastic piece 1 is 0.15 mm, the resonance frequency F0 ranges between 100 - 280 Hz; when the thickness t of the elastic piece 1 is 0.1 mm, the resonance frequency F0 ranges between 60 - 160 Hz.

[0078] In some exemplary embodiments, as Figure 4 shown, the geometric parameters of the elastic piece 1 include the width d of the elastic arm 12 of the elastic piece 1 along the radial direction of the mounting plate 11, and the width d of the elastic arm 12 is negatively correlated with the resonance frequency F0 of the vibrator. Here, the "radial direction" refers to the direction from the center of the mounting plate 11 to the edge of the mounting plate 11. The larger the width d of the elastic arm 12, the smaller the resonance frequency F0.

[0079] The method for adjusting the resonance frequency of the vibrator 100 includes: by increasing the width d of the elastic arm 12, to decrease the resonance frequency F0 of the vibrator; by decreasing the width d of the elastic arm 12, to increase the resonance frequency F0 of the vibrator. The influence factor of the width d of the elastic arm 12 on the resonance frequency F0 is small, and it can be used as an auxiliary adjustment means.

[0080] In some exemplary embodiments, as Figure 4 shown, the geometric parameters of the elastic piece 1 include the minimum distance r between the center of the mounting plate 11 and the fixing portion 13, and the minimum distance r is negatively correlated with the resonance frequency F0 of the vibrator. Specifically, when there are multiple fixing positions 6 on the fixing portion 13, r refers to the distance between the center of the mounting plate 11 and the center of the fixing position 6 closest to the center of the mounting plate 11. Here, the "fixing position" refers to the part where the fixing portion 13 is fixed to the support base 3. When the fixing portion 13 is fixed to the support base 3 by welding, the fixing position 6 refers to the welding position where the fixing portion 13 is welded to the support base 3. The farther the fixing position 6 (or the welding position) moves outward, the larger r is, and the smaller the resonance frequency F0 is.

[0081] The method for adjusting the resonance frequency F0 of the vibrator 100 includes: reducing the resonance frequency F0 of the vibrator 100 by increasing the minimum distance r; increasing the resonance frequency F0 of the vibrator 100 by reducing the minimum distance r. However, in actual design, the minimum distance r is rarely used as a means to adjust the resonance frequency F0 because the minimum distance r is limited by the process capability and reliability requirements.

[0082] In some exemplary embodiments, the material parameters of the elastic sheet 1 include the elastic modulus of the elastic sheet 1, and the elastic modulus of the elastic sheet 1 is positively correlated with the resonance frequency F0 of the vibrator 100. The elastic modulus can be regarded as an index to measure the ease of elastic deformation of the material. The greater the elastic modulus of the elastic sheet 1, the greater the stiffness of the elastic sheet 1, and the greater the resonance frequency F0. Generally, SUS301 is selected as the material of the elastic sheet 1. SUS301 is a conventional spring steel with excellent elasticity, corrosion resistance, and fatigue resistance. The material of the elastic sheet 1 can also be 65Mn, 12Cr18Ni9, SUS304, etc.

[0083] The method for adjusting the resonance frequency F0 of the vibrator 100 includes: increasing the resonance frequency F0 of the vibrator 100 by increasing the elastic modulus of the elastic sheet 1; reducing the resonance frequency F0 of the vibrator 100 by reducing the elastic modulus of the elastic sheet 1. Similarly, the elastic modulus of the elastic sheet 1 is rarely used as a means to adjust the resonance frequency F0, and the elastic modulus of the elastic sheet 1 is limited by the process capability and reliability requirements.

[0084] In some exemplary embodiments, as Figure 2 shown, the geometric parameters of the magnetic mover 2 include at least one of the outer diameter D of the magnetic mover 2 and the thickness T of the magnetic mover 2, and the outer diameter D of the magnetic mover 2 is negatively correlated with the resonance frequency F0 of the vibrator, and the thickness T of the magnetic mover 2 is negatively correlated with the resonance frequency F0 of the vibrator. The greater the outer diameter D of the magnetic mover 2, the smaller the resonance frequency F0; the greater the thickness T of the magnetic mover 2, the smaller the resonance frequency F0. Among them, when the magnetic mover 2 is non-circular, the outer diameter D of the magnetic mover 2 refers to the equivalent diameter.

[0085] The method for adjusting the resonance frequency F0 of the vibrator 100 includes: reducing the resonance frequency F0 of the vibrator 100 by increasing at least one of the outer diameter D of the magnetic mover 2 and the thickness T of the magnetic mover 2; increasing the resonance frequency F0 of the vibrator 100 by reducing at least one of the outer diameter D of the magnetic mover 2 and the thickness T of the magnetic mover 2. The influencing factors of the outer diameter D of the magnetic mover 2 and the thickness T of the magnetic mover 2 on the resonance frequency F0 are small, and can be used as an auxiliary adjustment means.

[0086] In some exemplary embodiments, as Figure 2 、 Figure 4 、 Figures 6 - 7As shown, the geometric parameters of the elastic piece 1 include the elastic arm angle θ of the elastic arm 12 extending circumferentially along the mounting plate 11 (extending around the axis of the mounting plate 11), the thickness t of the elastic piece 1, the width d of the elastic arm 12 in the radial direction of the mounting plate 11, and the minimum distance r between the fixing part 13 and the center of the mounting plate 11; the material parameters of the elastic piece 1 include the elastic modulus of the elastic piece 1; the geometric parameters of the magnetic mover 2 include the outer diameter D of the magnetic mover 2 and the thickness T of the magnetic mover 2.

[0087] The resonance frequency F0 of the vibrator satisfies the following formula (3):

[0088]

[0089] Wherein, k1 - k5 are coefficient constants, and k2 > k1 > 0, k3 < k4 < k5 < 0, |k2| > |k1| > |k3| > |k4| > |k5|.

[0090] C1 and C2 are constants.

[0091] K1 is a material coefficient, which is related to the elastic modulus and density of the elastic piece 1. The greater the elastic modulus of the elastic piece 1, the greater K1; the smaller the density of the elastic piece 1, the greater K1. Wherein, when the material is SUS301, K1 = 1.

[0092] K2 is a fixing coefficient, which is related to the fixing position of the fixing part 13. The greater the minimum distance r, the smaller K2.

[0093] This formula comprehensively considers all influencing factors of the resonance frequency F0. The resonance frequency F0 can be directly derived according to the theoretical formula, so as to design a vibrator that meets various usage requirements, and it is convenient to trace the results, reducing the time cost and money cost of verification, and greatly improving the adjustment efficiency.

[0094] In some exemplary embodiments, |k1| >> |k3|, and |k1| is at least 10e5 orders of magnitude larger than |k3|. According to the finite element analysis simulation data, k1 ≈ 450, k2 ≈ 4390, k3 ≈ -0.006, k4 ≈ -0.0015, k5 ≈ -0.001.

[0095] For the resonance frequency F0 of the vibrator 100, the adjustment process of the present application can be carried out in the following order, for example. First, select the material of the elastic piece 1. Secondly, determine the outer diameter D and thickness T of the magnetic mover 2. Then, change the thickness t of the elastic piece 1 to roughly adjust the resonance frequency F0. Then, determine the width d of the elastic arm 12. The influence factors of the width d of the elastic arm 12, the outer diameter D and thickness T of the magnetic mover 2 on the resonance frequency F0 are relatively small, and can be used as an auxiliary adjustment means in the actual design process. After selecting the above parameters, the resonance frequency F0 can be finely adjusted by changing the elastic arm angle θ. Because the range of the resonance frequency F0 values obtained by changing the elastic arm angle θ is wide, and changing the elastic arm angle θ is more manufacturable, etc., changing the elastic arm angle θ is the main means to adjust the resonance frequency F0 in the actual design process. Finally, determine the minimum distance r of the fixed position 6 of the elastic piece 1. In actual design, the material of the elastic piece 1 and the minimum distance r of the fixed position 6 of the elastic piece 1 are rarely used as means to adjust the resonance frequency F0, and are more affected by the process capabilities and reliability requirements.

[0096] In some exemplary embodiments, such as Figure 3 shown, the support base 3 is processed by the injection molding insert method. The support base 3 can include two parts, a metal insert 31 and an injection molding part 32. Among them, the metal insert 31 plays a role in increasing the strength of the support base 3 and facilitating welding with the mounting plate 11. The injection molding insert method is used for two purposes. One is to increase the strength of the entire support base 3, and the other is to be able to weld with the elastic piece 11. Since the strength of the welded connection is much higher than that of connection methods such as bonding and riveting, this structure can prevent the elastic piece 1 from aging and falling off after multiple vibrations, thus affecting the vibration performance of the vibrator 100.

[0097] In some exemplary embodiments, such as Figure 2 shown, the vibrator 100 further includes a flexible circuit board 4. The flexible circuit board 4 is located between the support base 3 and the magnetic stator 5. One side of the flexible circuit board 4 is bonded to the support base 3, and the other side is bonded to the magnetic stator 5. Two lead-out wires of the magnetic stator 5 are welded to the tin-plated layer of the flexible circuit board 4, and a current signal is applied to the magnetic stator 5 by means of the flexible circuit board 4.

[0098] In some exemplary embodiments, such as Figure 8 and Figure 9As shown in the figure, the above-mentioned vibrator 100 can be installed on the touch module. The touch module may include a touch substrate 10 and a control board 9. The control board 9 can be fixed to the touch substrate 10 and serve as a carrier for the vibrator 100. The bottom surface of the support base 3 of the vibrator 100 (i.e., the surface of the support base 3 opposite to the surface of the welding elastic piece 1) and the magnetic stator 5 are adhered to the control board 9 of the touch module through an adhesive 8. The periphery of the support base 3 is fixed to the control board 9 through a colloid 7 (e.g., a bonding colloid). After obtaining the resonance frequency F0 of the vibrator 100 by the above method, a driving current signal can be input when the magnetic stator 5 is energized. The magnetic stator 5 generates a force perpendicular to the end face of the magnet (a force along the central axis of the magnet) on the magnetic mover 2, causing the magnetic mover 2 to drive the elastic piece 1 to vibrate together. Since the elastic piece 1 is welded to the support base 3, the vibration of the elastic piece 1 is transmitted to the support base 3 through the welding part (fixing part 13). Also, because the support base 3 is adhered to the control board 9 of the touch module through the colloid 7, the vibration of the support base 3 is transmitted to the control board 9 of the touch module through the colloid 7. The vibrator 100 drives the touch module to resonate, and then the user can feel the vibration of the touch module, thus achieving the effect of vibration feedback.

[0099] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "edge", "opposite", "four corners", "periphery", "the 'mouth' - shaped structure", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the structure referred to has a specific orientation, is constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0100] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "connection", "direct connection", "indirect connection", "fixed connection", "installation", "assembly" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; the terms "installation", "connection", "fixed connection" can be directly connected or indirectly connected through an intermediate medium, and can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0101] Although the disclosed embodiments of the present application are as above, the content described is only an embodiment adopted for the convenience of understanding the present application and is not used to limit the present application. Any person skilled in the art within the scope of the present application can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed by the present application. However, the scope of patent protection of the present application shall still be defined by the appended claims.

Claims

1. A method for adjusting the resonance frequency of a vibrator, characterized in that, The vibrator includes a support base, a shrapnel, a magnetic mover and a magnetic stator that cooperate with each other. The shrapnel is fixed to the support base, and the magnetic mover is fixed to the shrapnel, and the magnetic stator is fixed to the support base; The adjustment method includes adjusting the resonance frequency F0 of the vibrator by changing at least one of the geometric parameters of the magnetic mover, the material parameters of the shrapnel, and the geometric parameters of the shrapnel.

2. The method for adjusting the resonance frequency of the vibrator according to claim 1, characterized in that The shrapnel includes a mounting plate, a spring arm and a fixing portion. The magnetic mover is fixed to the mounting plate. The spring arm extends circumferentially along the mounting plate, and both ends of the spring arm are respectively connected to the edge of the mounting plate and the fixing portion. The fixing portion is fixed to the support base; The geometric parameter of the shrapnel includes the angle θ at which the spring arm extends circumferentially along the mounting plate, and the angle θ is negatively correlated with the resonance frequency F0 of the vibrator; The adjustment method includes: By increasing the angle θ, the resonance frequency F0 of the vibrator is reduced; By reducing the angle θ, the resonance frequency F0 of the vibrator is increased.

3. The method for adjusting the resonance frequency of the vibrator according to claim 2, wherein, F0 = a × e -bθ , wherein, a and b are constants, and the range of the angle θ is from 30° to 120°.

4. The method for adjusting the resonance frequency of the vibrator according to claim 1, characterized in that The geometric parameter of the shrapnel includes the thickness t of the shrapnel, and the thickness t of the shrapnel is positively correlated with the resonance frequency F0 of the vibrator; The adjustment method includes: By increasing the thickness t of the shrapnel, the resonance frequency F0 of the vibrator is increased; By reducing the thickness t of the shrapnel, the resonance frequency F0 of the vibrator is reduced.

5. The method for adjusting the resonance frequency of the vibrator according to claim 1, characterized in that, The shrapnel includes a mounting plate, a spring arm and a fixing portion. The magnetic mover is fixed to the mounting plate. The spring arm extends circumferentially along the mounting plate, and both ends of the spring arm are respectively connected to the edge of the mounting plate and the fixing portion. The fixing portion is fixed to the support base; The geometric parameter of the shrapnel includes the width d of the spring arm in the radial direction of the mounting plate, and the width d of the spring arm is negatively correlated with the resonance frequency F0 of the vibrator; The adjustment method includes: By increasing the width d of the spring arm, the resonance frequency F0 of the vibrator is reduced; By reducing the width d of the spring arm, the resonance frequency F0 of the vibrator is increased.

6. The method for adjusting the resonance frequency of the vibrator according to claim 1, characterized in that, The shrapnel includes a mounting plate, a plurality of spring arms and a plurality of fixing portions. The magnetic mover is fixed to the mounting plate. The spring arms extend circumferentially along the mounting plate, and the plurality of spring arms and the plurality of fixing portions are both rotationally symmetric structures around the central axis of the mounting plate. One ends of the plurality of spring arms are all connected to the edge of the mounting plate, and the other ends of the plurality of spring arms are respectively connected to the plurality of fixing portions in one-to-one correspondence. The plurality of fixing portions are all fixed to the support base; The geometric parameter of the shrapnel includes the minimum distance r between the fixing portion and the center of the mounting plate, and the minimum distance r is negatively correlated with the resonance frequency F0 of the vibrator; The adjustment method includes: By increasing the minimum distance r, the resonance frequency F0 of the vibrator is reduced; By reducing the minimum distance r, the resonance frequency F0 of the vibrator is increased.

7. The method for adjusting the resonance frequency of the vibrator according to any one of claims 1 to 6, characterized in that, The material parameters of the elastic piece include the elastic modulus of the elastic piece, and the elastic modulus of the elastic piece is positively correlated with the resonance frequency F0 of the vibrator; The adjustment method includes: By increasing the elastic modulus of the elastic piece, the resonance frequency F0 of the vibrator is increased; By reducing the elastic modulus of the elastic piece, the resonance frequency F0 of the vibrator is decreased.

8. The method for adjusting the resonance frequency of the vibrator according to any one of claims 1 to 6, characterized in that, The geometric parameters of the magnetic mover include at least one of the outer diameter D of the magnetic mover and the thickness T of the magnetic mover, and the outer diameter D of the magnetic mover is negatively correlated with the resonance frequency F0 of the vibrator, and the thickness T of the magnetic mover is negatively correlated with the resonance frequency F0 of the vibrator; The adjustment method includes: By increasing at least one of the outer diameter D of the magnetic mover and the thickness T of the magnetic mover, the resonance frequency F0 of the vibrator is decreased; By reducing at least one of the outer diameter D of the magnetic mover and the thickness T of the magnetic mover, the resonance frequency F0 of the vibrator is increased.

9. The method for adjusting the resonance frequency of the vibrator according to claim 1, characterized in that The elastic piece includes a mounting plate, a plurality of elastic arms and a plurality of fixing parts. The magnetic mover is fixed to the mounting plate. The elastic arms extend along the circumferential direction of the mounting plate, and the plurality of elastic arms and the plurality of fixing parts are all rotationally symmetric structures around the central axis of the mounting plate. One ends of the plurality of elastic arms are all connected to the edge of the mounting plate, and the other ends of the plurality of elastic arms are respectively connected to the plurality of fixing parts in one-to-one correspondence, and the plurality of fixing parts are all fixed to the support seat; The geometric parameters of the elastic piece include the angle θ of the elastic arm extending along the circumferential direction of the mounting plate, the thickness t of the elastic piece, the width d of the elastic arm along the radial direction of the mounting plate, and the minimum distance r between the fixing part and the center of the mounting plate; The material parameters of the elastic piece include the elastic modulus of the elastic piece; The geometric parameters of the magnetic mover include the outer diameter D of the magnetic mover and the thickness T of the magnetic mover; The resonance frequency F0 of the vibrator satisfies: wherein, k1 - k5 are coefficient constants, and k2 > k1 > 0, k3 < k4 < k5 < 0, |k2| > |k1| > |k3| > |k4| > |k5|; C1 and C2 are constants; K1 is a material coefficient, which is related to the elastic modulus and density of the elastic piece. The larger the elastic modulus of the elastic piece, the larger K1; the smaller the density of the elastic piece, the larger K1; K2 is a fixing coefficient, which is related to the position of the fixing part. The larger the minimum distance r, the smaller K2.

10. The method for adjusting the resonance frequency of the vibrator according to claim 9, characterized in that, |k1| is at least one order of magnitude larger than |k3| by 10e5.

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