A method for processing a long-life flat vibration motor circuit board

Abstract

The application discloses a processing method of a long-service-life flat vibration motor circuit board and belongs to the technical field of circuit board processing. The processing method of the long-service-life flat vibration motor circuit board comprises the following steps: sequentially performing cutting, drilling, electroplating, outer layer circuit manufacturing, gold plating, resistance manufacturing, primary solder mask printing, primary exposure and development, secondary solder mask printing, secondary exposure and development, surface treatment, punching and plate dividing and performance testing on a PCB base material, and a long-service-life flat vibration motor circuit board is obtained. The service life of the flat vibration motor circuit board can be improved by developing a new process line, on the one hand, the rotor self-weight is reduced, on the other hand, the distance between the PCB and the magnetic cylinder is increased, and the magnetic size is reduced, and then the service life of the flat vibration motor circuit board is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit board processing, in particular to a processing method of long-life flat vibration motor circuit board. BACKGROUND

[0002] The service life of the flat vibration motor circuit board has been one of the focuses of the industry, and is also one of the process difficulties that domestic flat vibration motor circuit board manufacturers need to overcome.

[0003] In the process of continuous vibration of the motor, the electric brush rotates at high speed after being electrified and rubs on the yellow gold surface of the PCB, which is prone to wear and tear problems. The wear and tear is closely related to the size of the rotor itself and the magnetic force between the magnetic cylinder and the PCB. These two factors directly affect the pressure between the PCB gold surface and the electric brush, and also directly affect the service life of the PCB. SUMMARY

[0004] 1. Technical problem to be solved

[0005] In view of the problems existing in the prior art, the purpose of the present application is to provide a processing method of long-life flat vibration motor circuit board, which can develop a new process line, on the one hand, reduce the rotor itself weight, on the other hand, increase the distance between the PCB and the magnetic cylinder, reduce the magnetic size, and thus improve the service life of the flat vibration motor circuit board.

[0006] 2. Technical scheme

[0007] In order to solve the above problems, the present application adopts the following technical scheme.

[0008] A processing method of long-life flat vibration motor circuit board, comprising the following steps:

[0009] Step one, cutting, drilling, electroplating and outer layer circuit making are performed on the PCB substrate;

[0010] Step two, gold pretreatment is performed on the lower surface of the PCB substrate with completed outer layer circuit, and a PCB gold surface layer is formed on the lower surface of the PCB substrate;

[0011] Step three, the PCB substrate treated in step two is sent to resistance making;

[0012] Step four, after the resistance making is completed, solder resist ink printing is performed on the upper surface of the PCB substrate, and a first PCB green oil layer is obtained;

[0013] Step five, the first PCB green oil layer is exposed and developed, and the developed PCB substrate is subjected to secondary pretreatment;

[0014] Step six, solder resist ink printing is performed on the lower surface of the PCB substrate after the secondary pre-treatment, and a second PCB green oil layer is obtained, the second PCB green oil layer is outside the PCB gold surface layer, and the thickness of the second PCB green oil layer is greater than the thickness of the PCB gold surface layer;

[0015] Step seven, the second PCB green oil layer is exposed and developed;

[0016] Step eight, surface treatment is performed on the PCB substrate after step seven, and a long-life flat vibration motor circuit board is obtained;

[0017] Step nine, the long-life flat vibration motor circuit board obtained in step nine is cut and divided into plates and performance tests are performed.

[0018] Further, the thickness of the PCB substrate is 50-150μm.

[0019] Further, the thickness of the first PCB green oil layer is 10μm, and the thickness of the second PCB green oil layer is greater than 30μm.

[0020] Further, the electroplating thickness of the PCB substrate is 25μm.

[0021] Further, the thickness difference between the second PCB green oil layer and the PCB gold surface layer is 30μm.

[0022] Further, the printing screen for printing solder resist ink on the upper surface of the PCB substrate is 36T, and the printing screen for printing solder resist ink on the lower surface of the PCB substrate is 77T.

[0023] 3. Beneficial effects

[0024] Compared with the prior art, the advantages of the present application are:

[0025] (I) The present scheme develops a new process line, which reduces the rotor's own weight on one hand and increases the distance between the PCB and the magnetic cylinder on the other hand, reduces the magnetic size, and thus improves the service life of the flat vibration motor circuit board.

[0026] (II) By reducing the electroplating thickness of the PCB substrate to 25μm, the total weight of the rotor itself can be reduced, and the service life of the PCB board can be improved.

[0027] (III) By changing the thickness of the second green oil layer to increase the distance between the PCB gold surface layer and the magnetic steel, on one hand, the friction loss of the PCB gold surface layer by the brush can be reduced, and the service life of the PCB board can be improved, on the other hand, the heat dissipation space of the magnetic cylinder can be increased, and the service life of the magnetic cylinder can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1A schematic view of a cross-sectional structure of the PCB board of the present application.

[0029] Explanation of reference numerals in the drawing:

[0030] 1 PCB substrate, 2-1 first PCB green oil layer, 2-2 second PCB green oil layer, 3 PCB gold surface layer. DETAILED DESCRIPTION

[0031] Please refer to Figure 1 A processing method of a long-life flat vibration motor circuit board, comprising the following steps:

[0032] Step one, cutting, drilling, electroplating and outer layer circuit manufacturing are performed on the PCB substrate 1;

[0033] Step two, gold plating pretreatment is performed on the lower surface of the PCB substrate 1 with completed outer layer circuit, forming a PCB gold surface layer 3 on the lower surface of the PCB substrate 1, and the PCB substrate 1 and the PCB gold surface layer 3 are both annular structures;

[0034] Step three, the PCB substrate 1 treated in step two is sent to resistance manufacturing;

[0035] Step four, after the resistance manufacturing is completed, solder mask ink printing is performed on the upper surface of the PCB substrate 1, obtaining a first PCB green oil layer 2-1;

[0036] Step five, the first PCB green oil layer 2-1 is subjected to exposure and development, and the developed PCB substrate 1 is subjected to secondary pretreatment;

[0037] Step six, solder mask ink printing is performed on the lower surface of the PCB substrate 1 subjected to the secondary pretreatment, obtaining a second PCB green oil layer 2-2, the second PCB green oil layer 2-2 is an annular structure, the second PCB green oil layer 2-2 is outside the PCB gold surface layer 3, the difference between the outer diameter and the inner diameter of the second PCB green oil layer 2-2 plus the difference between the outer diameter and the inner diameter of the PCB gold surface layer 3 is equal to the difference between the outer diameter and the inner diameter of the PCB substrate 1, and the thickness of the second PCB green oil layer 2-2 is greater than the thickness of the PCB gold surface layer 3;

[0038] Step seven, exposure and development are performed on the second PCB green oil layer 2-2;

[0039] Step eight, surface treatment is performed on the PCB substrate 1 treated in step seven, obtaining a long-life flat vibration motor circuit board;

[0040] Step nine, the long-life flat vibration motor circuit board obtained in step nine is subjected to punching and plate dividing and performance testing.

[0041] The thickness of the PCB substrate 1 is 50-150 μm, specifically, the thickness of the PCB substrate 1 is 80 μm, 100 μm or 120 μm.

[0042] The thickness of the first PCB green oil layer 2-1 is 10 μm, and the thickness of the second PCB green oil layer 2-2 is greater than 30 μm, and the thickness of the second PCB green oil layer 2-2 can be 40 μm, that is, in the case of keeping the overall thickness of the PCB plate area unchanged, the ink thickness of the first PCB green oil layer 2-1 opposite to the PCB gold surface layer 3 is set to the conventional minimum size, and the thickness of the second PCB green oil layer 2-2 on the same side of the PCB gold surface layer 3 is increased by 30 μm, so that the PCB gold surface layer 3 is away from the magnetic cylinder, that is, the distance between the PCB gold surface layer 3 and the brush is increased, thereby reducing the friction loss of the brush to the PCB gold surface layer 3, and improving the service life of the PCB plate; the increased distance between the PCB gold surface layer 3 and the magnetic cylinder not only can improve the service life of the PCB plate, but also can increase the heat dissipation space of the magnetic cylinder, and improve the service life of the magnetic cylinder.

[0043] The electroplating thickness of the PCB substrate 1 is 25 μm, and usually the electroplating thickness of the PCB plate itself is 35 μm on both sides. In the case of keeping the overall thickness of the PCB plate area unchanged, by reducing the electroplating thickness of the PCB substrate 1 to 25 μm, the total weight of the rotor itself can be reduced, and the service life of the PCB plate can be improved.

[0044] The thickness difference between the second PCB green oil layer 2-2 and the PCB gold surface layer 3 is 30 μm, and the thickness difference between the second PCB green oil layer 2-2 and the PCB gold surface layer 3 is the distance between the PCB gold surface layer 3 and the brush.

[0045] The printing screen for printing the solder mask ink on the upper surface of the PCB substrate 1 is 36T, and the printing screen for printing the solder mask ink on the lower surface of the PCB substrate 1 is 77T.

Claims

1. A method of processing a long-life flat vibration motor wiring board, characterized by: The method comprises the following steps: Step one, cutting, drilling, electroplating, and outer layer circuit manufacturing of the PCB substrate (1); Step two, gold plating pretreatment of the lower surface of the PCB substrate (1) with completed outer layer circuit, to form a PCB gold surface layer (3) on the lower surface of the PCB substrate (1); Step three, sending the PCB substrate (1) treated in step two to resistance manufacturing; Step four, after resistance manufacturing, printing solder resist ink on the upper surface of the PCB substrate (1) to obtain a first PCB green oil layer (2-1); Step five, exposing and developing the first PCB green oil layer (2-1), and then performing secondary pretreatment on the PCB substrate (1); Step six, printing solder resist ink on the lower surface of the PCB substrate (1) after secondary pretreatment to obtain a second PCB green oil layer (2-2), the second PCB green oil layer (2-2) is outside the PCB gold surface layer (3), and the thickness of the second PCB green oil layer (2-2) is greater than that of the PCB gold surface layer (3); Step seven, exposing and developing the second PCB green oil layer (2-2); Step eight, surface treatment of the PCB substrate (1) treated in step seven to obtain a long-life flat vibration motor circuit board; Step nine, punching and dividing the long-life flat vibration motor circuit board obtained in step nine and performing performance test; The thickness of the first PCB green oil layer (2-1) is 10 μm, and the thickness of the second PCB green oil layer (2-2) is greater than 30 μm; The electroplating thickness of the PCB substrate (1) is 25 μm; The thickness difference between the second PCB green oil layer (2-2) and the PCB gold surface layer (3) is 30 μm.

2. The processing method of a long-life flat vibration motor circuit board according to claim 1, characterized in that: The thickness of the PCB substrate (1) is 50-150 μm.

3. The processing method of a long-life flat vibration motor circuit board according to claim 1, characterized in that: The printing screen for printing solder resist ink on the upper surface of the PCB substrate (1) is 36T, and the printing screen for printing solder resist ink on the lower surface of the PCB substrate (1) is 77T.

Images