Z-axis linear vibration motor

Abstract

The utility model discloses a Z-axis linear vibration motor, which belongs to the technical field of vibration motors and comprises a lower bracket, an FPC (flexible printed circuit) board is connected inside the lower bracket, two bonding pads are arranged on the FPC board, the two bonding pads are arranged at an angle of 120 degrees by taking the circle center of the FPC board as the circle center, a coil is connected onto the FPC board, two leads of the coil are respectively welded with the bonding pads, and the two leads of the coil are respectively welded with the bonding pads. The upper portion of the lower bracket is connected with a spring piece, an inner ring of the spring piece is provided with an avoiding groove corresponding to the bonding pad, the upper portion of the inner ring of the spring piece is connected with an oscillator assembly, and the outer portion of the upper portion of the lower bracket is connected with a machine shell. According to the utility model, the inner ring of the spring piece is provided with the avoiding groove corresponding to the bonding pad, so that in a mechanical shock reliability experiment, even if the spring piece touches an FPC board, the spring piece does not touch a lead of a coil, the lead of the coil is well protected, the motor is ensured not to fail due to the fact that the lead is broken by collision, and the service life of the motor is prolonged. Therefore, the reliability of the motor is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of vibration motors, and in particular relates to a Z-axis linear vibration motor. Background Art

[0002] Micro vibration motors are essential components for electronic products such as mobile phones, tablet computers, and electronic toys, providing tactile feedback to users. As competition in the smartphone market intensifies, mobile phone manufacturers are paying more and more attention to the user's tactile experience, and linear vibration motors, which are different from traditional rotor motors, have appeared on the market.

[0003] Compared with traditional rotor motors, linear motors have great advantages in vibration characteristics, response time, service life, noise, etc., and they can provide multiple vibration modes, providing users with rich, diverse, delicate and realistic tactile feedback.

[0004] Linear vibration motors are divided into Z-axis vertical vibration linear motors and X-axis horizontal vibration linear motors. Z-axis linear motors are widely used in mid-to-high-end models of various mobile phone manufacturers, and there is a trend of extending downward to low-end models to replace traditional motors.

[0005] Currently, the structures of Z-axis linear vibration motors are generally the same, and there is a common problem, that is, in mechanical impact tests, the inner coil of the spring can easily hit the lead of the coil, and the lead can easily be broken, causing the motor circuit to be disconnected, and ultimately causing the motor to fail. Utility Model Content

[0006] In order to solve the problems raised in the above background technology, the utility model provides a Z-axis linear vibration motor, which has the characteristics of allowing the inner ring of the spring to avoid the coil lead on the FPC board, thereby improving the reliability of the motor.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a Z-axis linear vibration motor, comprising a lower bracket, an FPC board is connected to the interior of the lower bracket, two soldering pads are arranged on the FPC board, the two soldering pads are arranged at 120 degrees with the center of the FPC board as the center, a coil is connected to the FPC board, two leads of the coil are respectively welded to the soldering pads, a spring sheet is connected to the top of the lower bracket, an avoidance groove corresponding to the soldering pad is provided on the inner circle of the spring sheet, a vibrator assembly is connected to the top of the inner circle of the spring sheet, and the outside of the top of the lower bracket is connected to a housing.

[0008] In order to provide a welding surface for the spring sheet and the lower bracket on the one hand, and to realize the positioning of the spring sheet and the lower bracket on the other hand, so that there is no need to consider the assembly angle when assembling the spring sheet, further, three lower bracket bosses are arranged in an annular array on the periphery of the lower bracket, and three spring sheet bosses are arranged in an annular array on the circumference of the spring sheet. There are three avoidance grooves in total, and the three avoidance grooves are arranged in an annular array.

[0009] In order to provide a driving magnetic field, the vibrator assembly further includes a mass block, the mass block is connected to the inner circle of the spring sheet, and a magnetic steel is arranged inside the mass block.

[0010] In order to gather the magnetic field and improve the driving force on the one hand, and to provide an assembly surface for the magnetic steel on the other hand, the vibrator assembly further includes a magnetic frame, the magnetic frame is connected to the inside of the mass block, and the magnetic steel is connected to the inside of the magnetic frame.

[0011] In order to avoid the casing during vibration and prevent collision with the casing, chamfers are further provided on the upper and lower sides of the circumference of the mass block.

[0012] In order to allow the coil to be bonded to both the FPC board and the lower bracket and to increase the stability of the coil assembly, the FPC board is further provided with a plurality of hollow grooves corresponding to the coil.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model provides an avoidance groove corresponding to the pad on the inner circle of the spring sheet. In the mechanical shock reliability test, even if the spring sheet touches the FPC board, the spring sheet will not touch the lead of the coil, so that the lead of the coil is well protected, ensuring that the motor will not fail due to the lead being broken, thereby improving the reliability of the motor;

[0015] 2. The utility model has three lower bracket bosses in an annular array on the periphery of the lower bracket, and three spring sheet bosses in an annular array on the circumference of the spring sheet. There are three avoidance grooves in total. The three avoidance grooves are in an annular array. On the one hand, they provide a welding surface for the spring sheet and the lower bracket, and on the other hand, they realize the positioning of the spring sheet and the lower bracket, so that there is no need to consider the assembly angle when assembling the spring sheet;

[0016] 3. The upper and lower sides of the circumference of the mass block of the utility model are both chamfered, which can avoid the casing during vibration and prevent collision with the casing;

[0017] 4. The FPC board of the utility model is provided with a plurality of hollow grooves corresponding to the coils, so that the coils can be bonded to both the FPC board and the lower bracket, thereby increasing the stability of the coil assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a cross-sectional structural schematic diagram of the utility model;

[0020] Figure 2It is a cross-sectional structural schematic diagram of the vibrator assembly of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the spring sheet of the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the lower bracket of the utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the FPC board of the utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the connection between the spring sheet, the FPC board and the lower bracket of the utility model;

[0025] In the figure: 1, housing; 2, vibrator assembly; 21, mass block; 22, magnetic frame; 23, magnetic steel; 3, lower bracket; 31, lower bracket boss; 4, coil; 5, FPC board; 51, solder pad; 52, hollow groove; 6, spring sheet; 61, avoidance groove; 62, spring sheet boss. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Example 1

[0028] See also Figure 1-6 The utility model provides the following technical solutions: a Z-axis linear vibration motor, comprising a lower bracket 3, an FPC board 5 is connected inside the lower bracket 3, two pads 51 are arranged on the FPC board 5, the two pads 51 are arranged at 120 degrees with the center of the FPC board 5 as the center, a coil 4 is connected to the FPC board 5, two leads of the coil 4 are respectively welded to the pads 51, a spring sheet 6 is connected above the lower bracket 3, an avoidance groove 61 corresponding to the pad 51 is provided on the inner circle of the spring sheet 6, a vibrator assembly 2 is connected above the inner circle of the spring sheet 6, and an outer shell 1 is connected to the top of the lower bracket 3.

[0029] By adopting the above technical solution, the utility model sets an avoidance groove 61 corresponding to the welding pad 51 on the inner circle of the spring sheet 6. In the mechanical impact reliability test, even if the spring sheet 6 touches the FPC board 5, the spring sheet 6 will not touch the lead of the coil 4, so that the lead of the coil 4 is well protected, ensuring that the motor will not fail due to the lead being broken, thereby improving the reliability of the motor.

[0030] Specifically, three lower bracket bosses 31 are arranged in an annular array on the periphery of the lower bracket 3, three spring sheet bosses 62 are arranged in an annular array on the circumference of the spring sheet 6, and three avoidance grooves 61 are provided in total, and the three avoidance grooves 61 are arranged in an annular array.

[0031] By adopting the above technical solution, on the one hand, a welding surface is provided for the spring sheet 6 and the lower bracket 3 , and on the other hand, the positioning of the spring sheet 6 and the lower bracket 3 is achieved, so that there is no need to consider the assembly angle when assembling the spring sheet 6 .

[0032] Specifically, the vibrator assembly 2 includes a mass block 21 , which is connected to the inner circle of the spring sheet 6 , and a magnetic steel 23 is provided inside the mass block 21 .

[0033] By adopting the above technical solution, a driving magnetic field is provided.

[0034] Specifically, the vibrator assembly 2 further includes a magnetic frame 22 , the magnetic frame 22 is connected to the interior of the mass block 21 , and the magnetic steel 23 is connected to the interior of the magnetic frame 22 .

[0035] By adopting the above technical solution, on the one hand, it is used to gather the magnetic field and improve the driving force, and on the other hand, it provides an assembly surface for the magnetic steel 23.

[0036] Example 2

[0037] The difference between this embodiment and the first embodiment is that: specifically, chamfers are provided on the upper and lower sides of the circumference of the mass block 21.

[0038] By adopting the above technical solution, the housing 1 can be avoided during the vibration process to prevent collision with the housing 1.

[0039] Example 3

[0040] The difference between this embodiment and the first embodiment is that, specifically, a plurality of hollow grooves 52 corresponding to the coils 4 are provided on the FPC board 5 .

[0041] By adopting the above technical solution, the coil 4 can be bonded to both the FPC board 5 and the lower bracket 3 , thereby increasing the stability of the assembly of the coil 4 .

[0042] In summary, the utility model sets an avoidance groove 61 corresponding to the welding pad 51 on the inner circle of the spring sheet 6. In the mechanical impact reliability test, even if the spring sheet 6 touches the FPC board 5, the spring sheet 6 will not touch the lead of the coil 4, so that the lead of the coil 4 is well protected, ensuring that the motor will not fail due to the lead being broken, thereby improving the reliability of the motor; the utility model has three lower bracket bosses 31 in an annular array on the periphery of the lower bracket 3, and three spring sheet bosses 62 in an annular array on the circumference of the spring sheet 6. The avoidance groove 61 has a total of three The three avoidance grooves 61 are in a ring array, which provide a welding surface for the spring sheet 6 and the lower bracket 3 on the one hand, and realize the positioning of the spring sheet 6 and the lower bracket 3 on the other hand, so that there is no need to consider the assembly angle when assembling the spring sheet 6; the upper and lower sides of the circumference of the mass block 21 of the utility model are chamfered, which can avoid the casing 1 during vibration to prevent collision with the casing 1; the FPC board 5 of the utility model is provided with a plurality of hollow grooves 52 corresponding to the coil 4, so that the coil 4 can be bonded to the FPC board 5 and the lower bracket 3, thereby increasing the stability of the assembly of the coil 4.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A Z-axis linear vibration motor, comprising a lower bracket, characterized in that: The interior of the lower bracket is connected to an FPC board, which is provided with two soldering pads, which are arranged at 120 degrees with the center of the FPC board as the center of the circle. A coil is connected to the FPC board, and two leads of the coil are respectively welded to the soldering pads. The top of the lower bracket is connected to a spring sheet, and the inner circle of the spring sheet is provided with an avoidance groove corresponding to the soldering pad. The top of the inner circle of the spring sheet is connected to a vibrator assembly, and the outside of the top of the lower bracket is connected to a casing.

2. A Z-axis linear vibration motor according to claim 1, characterized in that: The lower bracket has three lower bracket bosses in an annular array on the periphery, and the spring sheet has three spring sheet bosses in an annular array on the circumference.

3. A Z-axis linear vibration motor according to claim 2, characterized in that: There are three avoidance grooves in total, and the three avoidance grooves are arranged in a ring array.

4. The Z-axis linear vibration motor according to claim 1, characterized in that: The vibrator assembly comprises a mass block, which is connected to the inner circle of the spring sheet, and a magnetic steel is arranged inside the mass block.

5. The Z-axis linear vibration motor according to claim 4, characterized in that: The vibrator assembly also includes a magnetic frame, which is connected to the interior of the mass block, and the magnetic steel is connected to the interior of the magnetic frame.

6. The Z-axis linear vibration motor according to claim 4, characterized in that: Chamfers are provided on the upper and lower sides of the circumference of the mass block.

7. The Z-axis linear vibration motor according to claim 1, characterized in that: The FPC board is provided with a plurality of hollow grooves corresponding to the coils.

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