Spring and lower bracket assembly of square Z-axis linear motor

Abstract

The utility model discloses a spring and lower bracket assembly of a square Z-axis linear motor, which comprises a lower bracket and a spring, an FPC (Flexible Printed Circuit) is connected above the lower bracket, a coil is connected above the FPC, two bonding pads connected with a lead of the coil are arranged on the FPC, the two bonding pads are arranged at an angle of 120 degrees by taking the circle center of the coil as the center, the spring is arranged above the lower bracket, and the spring is arranged above the lower bracket. A through groove corresponding to the coil is formed in the center of the spring, and three receding grooves arranged at 120 degrees are formed in the circumferential side of the through groove. According to the utility model, the two bonding pads are arranged at an angle of 120 degrees by taking the circle center of the coil as the center, and the three avoiding grooves which are arranged at an angle of 120 degrees are arranged on the circumferential side of the through groove, so that the inner ring of the spring can avoid the lead of the coil, and the situation that a motor circuit is broken due to the fact that the lead of the coil is broken by collision by the spring under the conditions of a mechanical shock test and the like can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to linear motor technical field, concretely relates to a spring and lower bracket subassembly of square Z axis linear motor. BACKGROUND

[0002] Miniature vibration motor is indispensable component of electronic product such as mobile phone, tablet computer, electronic toy, and it provides tactile feedback for user. With the intensification of smart phone market competition, mobile phone manufacturers pay more and more attention to user tactile experience, and linear vibration motor different from traditional rotor motor appears in market.

[0003] Compared with traditional rotor motor, linear motor has great advantage in vibration characteristic, response time, service life, noise and so on, and it can provide multiple vibration modes and provide rich and delicate tactile feedback for user. Linear vibration motor is divided into Z axis vertical vibration linear motor and X axis horizontal vibration linear motor.

[0004] At present, Z axis linear vibration motor is generally circular, and space utilization rate is not high in whole machine, under the same length, width and height size limit, square Z axis linear vibration motor can provide greater vibration amount.

[0005] However, existing square Z axis linear vibration motor is prone to coil lead breakage caused by spring impact under mechanical impact test and other conditions, resulting in motor circuit breakage. UTILITY MODEL CONTENTS

[0006] The utility model discloses a spring and lower bracket subassembly of square Z axis linear motor to solve the problem in the background art. The utility model provides a spring and lower bracket subassembly of square Z axis linear motor, which can effectively prevent spring impact under mechanical impact test and other conditions.

[0007] To achieve the above object, the utility model provides the following technical scheme: a spring and lower bracket subassembly of square Z axis linear motor, including lower bracket and spring, the upper of lower bracket is connected with FPC, the upper of FPC is connected with coil, and two pads for connecting the lead of coil are arranged on FPC, the two pads are arranged at 120 ° around the center of coil, the upper of lower bracket is provided with spring, the center position of spring is provided with through slot corresponding to coil, and three avoiding grooves arranged at 120 ° are arranged on the circumferential side of through slot.

[0008] In order to realize the positioning of spring, the avoiding grooves are corresponded with the pads, further, four spring bosses are arranged on the periphery of spring. The lower bracket is provided with lower bracket boss corresponding to the spring boss.

[0009] To provide a welding surface for the spring and the lower bracket, the spring and the lower bracket are welded and fixed to ensure that the position of the spring does not shift. Furthermore, a notch is provided on one of the spring bosses.

[0010] To provide installation space for the FPC and clearance space for the spring, a groove is further provided on the upper part of the lower bracket.

[0011] In order to give the coil a large inductance and ensure that it generates a large magnetic flux and a large driving force when the coil is energized, an iron core is further provided inside the coil.

[0012] In order to provide an assembly surface and positioning for the iron core, and to provide positioning for the FPC and coil via the iron core, the lower bracket is further provided with a first circular hole corresponding to the iron core.

[0013] To further avoid the iron core, a second circular hole is provided on the FPC.

[0014] In order to guide the magnetic field lines, increase the utilization rate of the magnetic field, and thus increase the driving force of the motor, a yoke is further provided above the coil.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. In this utility model, two solder pads are arranged at 120° with the center of the coil as the center, and three clearance slots arranged at 120° are provided on the circumference of the through slot, so that the inner ring of the spring can avoid the coil lead, which can prevent the motor circuit from being broken due to the spring breaking the coil lead under mechanical impact test and other conditions.

[0017] 2. This utility model achieves spring positioning by cooperating with the spring boss and the lower bracket boss, thereby ensuring that the clearance groove corresponds to the solder pad;

[0018] 3. One of the spring protrusions in this utility model is provided with a notch groove to provide a welding surface for the spring and the lower bracket, so as to weld and fix the spring and the lower bracket to ensure that the position of the spring does not shift. Attached Figure Description

[0019] Figure 1 This is an exploded view of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the spring of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the FPC of this utility model;

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

[0023] Figure 5 This is a top view of the structure of this utility model.

[0024] In the diagram: 1. Iron core; 2. Lower bracket; 21. Lower bracket boss; 22. First round hole; 23. Groove; 3. FPC; 31. Second round hole; 32. Solder pad; 4. Coil; 5. Spring; 51. Spring boss; 52. Clearance groove; 53. Through groove; 54. Notch groove; 6. Yoke. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1

[0027] Please see Figures 1-5 The present invention provides the following technical solution: a spring and lower bracket assembly for a square Z-axis linear motor, including a lower bracket 2 and a spring 5. An FPC3 is connected above the lower bracket 2, and a coil 4 is connected above the FPC3. The FPC3 is provided with two solder pads 32 connected to the leads of the coil 4. The two solder pads 32 are arranged at 120° with the center of the coil 4 as the center. The spring 5 is located above the lower bracket 2. A through groove 53 corresponding to the coil 4 is provided at the center of the spring 5. Three clearance grooves 52 arranged at 120° are provided on the circumferential side of the through groove 53.

[0028] By adopting the above technical solution, the present invention arranges two solder pads 32 at 120° with the center of the coil 4 as the center, and provides three clearance grooves 52 arranged at 120° on the circumferential side of the through groove 53, so that the inner ring of the spring 5 can avoid the lead wire of the coil 4, which can avoid the motor circuit being broken due to the spring 5 hitting the lead wire of the coil 4 under mechanical impact test and other conditions.

[0029] Specifically, the spring 5 has four spring bosses 51 around its perimeter, and the lower bracket 2 has a lower bracket boss 21 corresponding to the spring bosses 51.

[0030] By adopting the above technical solution, the spring 5 is positioned by the cooperation between the spring boss 51 and the lower bracket boss 21, thereby ensuring that the clearance groove 52 corresponds to the solder pad 32.

[0031] Specifically, a groove 23 is provided above the lower bracket 2.

[0032] The above technical solution is used to provide installation space for FPC3 and clearance space for spring 5.

[0033] Example 2

[0034] The difference between this embodiment and embodiment 1 is that, specifically, one of the spring bosses 51 is provided with a notch 54.

[0035] By adopting the above technical solution, a welding surface is provided for the spring 5 and the lower bracket 2, and the spring 5 and the lower bracket 2 are welded and fixed to ensure that the position of the spring 5 does not shift.

[0036] Example 3

[0037] The difference between this embodiment and embodiment 1 is that, specifically, the coil 4 has an iron core 1 inside.

[0038] By adopting the above technical solution, the coil 4 has a large inductance, which ensures that the coil 4 generates a large magnetic flux and a large driving force when energized.

[0039] Specifically, the lower bracket 2 is provided with a first circular hole 22 corresponding to the iron core 1.

[0040] By adopting the above technical solution, an assembly surface and positioning are provided for the iron core 1, and the iron core 1 provides positioning for the FPC3 and the coil 4.

[0041] Specifically, the FPC3 is provided with a second circular hole 31.

[0042] The above technical solution is used to avoid the iron core 1.

[0043] Example 4

[0044] The difference between this embodiment and embodiment 1 is that, specifically, a yoke 6 is provided above the coil 4.

[0045] By adopting the above technical solution, the magnetic field lines are guided, the utilization rate of the magnetic field is increased, thereby increasing the driving force of the motor.

[0046] In summary, this invention arranges two pads 32 at 120° angles around the center of the coil 4, and provides three clearance slots 52 arranged at 120° angles on the circumference of the through slot 53. This allows the inner ring of the spring 5 to avoid the lead wire of the coil 4, preventing the motor circuit from being broken due to the spring 5 striking the lead wire of the coil 4 under mechanical impact tests. This invention positions the spring 5 by cooperating with the lower bracket boss 21, thus ensuring that the clearance slots 52 correspond to the pads 32. One of the spring bosses 51 has a notch 54, providing a welding surface for the spring 5 and the lower bracket 2, welding and fixing the spring 5 and the lower bracket 2 to ensure that the position of the spring 5 does not shift.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A spring and lower bracket assembly for a square Z-axis linear motor, characterized in that: It includes a lower bracket and a spring. An FPC is connected to the top of the lower bracket, and a coil is connected to the top of the FPC. The FPC has two pads that are connected to the leads of the coil. The two pads are arranged at 120° with the center of the coil as the center. The spring is located above the lower bracket. A through slot corresponding to the coil is provided at the center of the spring. Three clearance slots arranged at 120° are provided on the circumference of the through slot.

2. The spring and lower bracket assembly of a square Z-axis linear motor according to claim 1, characterized in that: The spring has four spring bosses around its perimeter.

3. The spring and lower bracket assembly of a square Z-axis linear motor according to claim 2, characterized in that: The lower bracket is provided with a lower bracket boss corresponding to the spring boss.

4. The spring and lower bracket assembly of a square Z-axis linear motor according to claim 3, characterized in that: One of the spring bosses has a notch or groove.

5. The spring and lower bracket assembly of a square Z-axis linear motor according to claim 1, characterized in that: The lower bracket has a groove on its upper part.

6. The spring and lower bracket assembly of a square Z-axis linear motor according to claim 1, characterized in that: The coil has an iron core inside.

7. The spring and lower bracket assembly of a square Z-axis linear motor according to claim 6, characterized in that: The lower bracket is provided with a first circular hole corresponding to the iron core.

8. The spring and lower bracket assembly of a square Z-axis linear motor according to claim 7, characterized in that: The FPC is provided with a second circular hole.

9. The spring and lower bracket assembly of a square Z-axis linear motor according to claim 1, characterized in that: A yoke is provided above the coil.

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