Voltage stabilization control mechanism for laser trimming

Abstract

The utility model discloses a voltage stabilization control mechanism for laser trimming in the technical field of PCB (printed circuit board) processing, and aims to solve the problem that the resistance voltage of a PCB (printed circuit board) is easy to be unstable during laser trimming of a resistor in the prior art. The device comprises a workbench and a mounting frame mounted on the workbench, a laser is arranged on the mounting frame, a placement plate used for placing a PCB is arranged on the workbench, the placement plate is located in the working area range of the laser, and an air blowing assembly is further arranged on the workbench and comprises an air inlet pipe, a cooling box and an air blowing pipe. Cooling liquid is contained in the cooling box, the air inlet pipe and the air blowing pipe are both communicated with the cooling box, and a pipeline of the air inlet pipe is inserted into the cooling liquid. When the laser trimming device is used for trimming the carbon film resistor by laser, the trimming environment is controlled, the large difference between the preset trimming parameter and the actual trimming result is prevented, the stability of the voltage of a circuit board is favorably controlled, and the quality and the yield of products are ensured.

Description

Technical Field

[0001] This utility model relates to a voltage stabilization control mechanism for laser trimming, belonging to the field of PCB processing technology. Background Technology

[0002] To facilitate fabrication and adjustment, PCB resistors are often pre-printed with carbon film to form the resistor circuits. After printing, laser trimming is used to change the shape of the carbon film to adjust the resistance value. However, during the trial production of ceramic power tool switch motherboards, it was found that the voltage fluctuated wildly after laser trimming. This is mainly because the laser trimming process causes excessive localized heating on the surface of the carbon film resistor, leading to instability in the trimming process and ultimately resulting in unstable output voltage, affecting the product's production performance and yield. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a voltage regulation control mechanism for laser trimming. This mechanism controls the trimming environment when trimming carbon film resistors with lasers, preventing significant differences between preset trimming parameters and actual trimming results. This helps to control the stability of the circuit board voltage, thereby ensuring product quality and yield.

[0004] To achieve the above objectives, this utility model employs the following technical solution:

[0005] This utility model provides a voltage stabilization control mechanism for laser adjustment, including a worktable and a mounting bracket mounted on the worktable. The mounting bracket is equipped with a laser, and the worktable is equipped with a placement plate for placing a PCB board. The placement plate is located within the working area of ​​the laser. The worktable is also equipped with an air blowing assembly, which includes an air inlet pipe, a cooling box, and an air blowing pipe. The cooling box contains coolant, and both the air inlet pipe and the air blowing pipe are connected to the cooling box. The air inlet pipe is inserted into the coolant, and the air blowing pipe points towards the position of the placement plate.

[0006] Specifically, a drying mechanism is provided on the air blowing pipe section or the air blowing end of the cooling box, and the drying mechanism includes at least a storage component that can be ventilated and can contain desiccant.

[0007] Specifically, the placement plate is slidably disposed on the worktable, and the worktable is also provided with a first driving component for driving the placement plate to slide.

[0008] Specifically, the cooling box has a semiconductor refrigeration chip attached to its wall, with the cooling side of the semiconductor refrigeration chip in contact with the wall of the cooling box and the heating side of the semiconductor refrigeration chip having a heat sink. The air inlet pipe is inserted into the liquid at a position close to the semiconductor refrigeration chip.

[0009] Specifically, it also includes a pointing bracket assembly and an airway positioning frame. The airway positioning frame is used to fix the blowing end of the airway tube. The pointing bracket assembly includes a second driving assembly, a third driving assembly, and a fourth driving assembly. The second driving assembly, the third driving assembly, and the fourth driving assembly are used to drive the airway positioning frame to move in space.

[0010] Specifically, the driving end of the fourth driving component is fixedly connected to the tracheal positioning frame. The fourth driving component and the third driving component are connected through an angle adjustment component. The angle adjustment component includes a first connecting plate installed at the output end of the third driving component and a second connecting plate installed at the fixed end of the fourth driving component. A sector plate is fixedly installed on both the first and second connecting plates. Multiple sector plates are coaxially hinged and rotated. At least one of the sector plates has an arc groove, and another sector plate has a sliding rod that is slidably disposed inside the arc groove. A fifth driving component is installed on the first connecting plate, and the output end of the fifth driving component is rotatably provided with a connecting rod that is hinged to the second connecting plate.

[0011] Specifically, a vision camera is also mounted on the mounting bracket, a protective cover is slidably mounted on the mounting bracket, and a sixth driving component for driving the protective cover to shield the vision camera lens is also mounted on the mounting bracket.

[0012] Specifically, it also includes a fan assembly, and an exhaust pipe connected to the fan assembly is provided at the position corresponding to the placement plate on the workbench.

[0013] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0014] This invention reduces the ambient temperature during laser resistor adjustment by incorporating a cooling air blowing mechanism, which simultaneously removes carbon film residue generated during laser adjustment. This effectively ensures the stability of laser adjustment work, reduces errors during resistor adjustment, and thus ensures the yield of PCB products and the voltage stability of the working circuit. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the voltage stabilizing control mechanism provided in this embodiment of the utility model;

[0016] Figure 2 This is a utility model Figure 1An enlarged view of the structure at point A of the voltage regulation control mechanism provided in the embodiment;

[0017] Figure 3 This is a utility model Figure 1 Enlarged view of the structure at point B of the voltage regulation control mechanism provided in the embodiment;

[0018] Figure 4 This is another schematic diagram of the voltage stabilizing control mechanism provided in this embodiment of the utility model;

[0019] Figure 5 This is a utility model Figure 4 Enlarged view of the structure at point C of the voltage regulation control mechanism provided in the embodiment;

[0020] Figure 6 This is a utility model Figure 4 Enlarged view of the structure at point D of the voltage regulation control mechanism provided in the embodiment;

[0021] Figure 7 This is a side view of the voltage stabilizing control mechanism provided in this embodiment of the utility model;

[0022] Figure 8 This is a utility model Figure 7 A cross-sectional view of the voltage regulation control mechanism provided in the embodiment;

[0023] Reference numerals: 1. Workbench; 2. Mounting bracket; 3. Laser; 4. Placement plate; 5. First drive assembly; 6. Cooling box; 7. Semiconductor cooling chip; 8. Heat sink; 9. Second drive assembly; 10. Third drive assembly; 11. First connecting plate; 12. Second connecting plate; 13. Positioning bracket; 14. Fan-shaped plate; 15. Fifth drive assembly; 16. Vision camera; 17. Protective cover; 18. Sixth drive assembly; 19. Air extraction pipe; 20. Fan assembly; 21. Air blowing pipe; 22. Fourth drive assembly; 23. Connecting rod. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0025] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example:

[0027] This utility model provides a voltage regulation control mechanism for laser trimming of carbon film resistors. This mechanism controls the trimming environment during laser trimming of carbon film resistors, preventing significant discrepancies between preset trimming parameters and actual trimming results. This helps control the stability of the circuit board voltage, thereby ensuring product quality and yield. To achieve the structural function of the mechanism, it includes a workbench 1 and a mounting frame 2 mounted on the workbench 1. To perform laser trimming on the carbon film resistors on the PCB board, a laser 3 is mounted on the mounting frame 2, and a placement plate 4 for placing the PCB board is provided on the workbench 1. The placement plate 4 should be located within the working area of ​​the laser 3, and preferably has a hollowed-out bottom for overall heat dissipation. To assist in the laser trimming of the carbon film resistors, an air blowing assembly is also provided on the workbench 1, specifically including an air inlet pipe, a cooling box 6, and an air blowing pipe 21. Its purpose is to facilitate laser trimming... When adjusting carbon film resistors, the temperature at the adjustment location can be controlled, and deformed carbon film resistor particles can be blown away in a timely manner to avoid further impact on the adjustment work. To ensure that the temperature of the blown gas is at a low level to control the temperature at the reaction location, coolant is placed in the cooling box 6, and both the air inlet pipe and the blowing pipe 21 are connected to the cooling box 6. The air inlet pipe is inserted into the coolant so that the gas can exchange heat with the coolant to achieve a rapid cooling effect. The blowing pipe 21 is pointed to the position of the placement plate 4 so that the room temperature gas supplied by the mechanism can be rapidly cooled by the coolant during operation. The rapidly cooled low-temperature liquid is directly blown onto the reaction location of the PCB board, thereby achieving rapid cooling of the adjustment location and simultaneously blowing away the slag generated by laser adjustment to avoid affecting subsequent adjustment work. This ensures the accuracy of the adjustment work and helps to ensure the stability of the voltage when the PCB board is working. Tests have shown that the pass rate can be increased from 75%-80% to 96%-98%, while costs can be effectively controlled.

[0028] This utility model provides a voltage stabilization control mechanism for laser trimming. To prevent the gas from blowing a small amount of water vapor onto the surface of the PCB board through the cooling box 6, which would indirectly affect the quality of the trimming work, a drying mechanism can be provided on the air blowing pipe 21 or the air blowing end of the cooling box 6. The drying mechanism should include at least a storage component that can be ventilated and can hold desiccant, such as a cloth drying bag, with sufficient ventilation mesh to filter and dehumidify using desiccant.

[0029] This utility model provides a voltage stabilization control mechanism for laser trimming. In order to reduce the offset of laser requirements, the placement plate 4 can be slidably placed on the worktable 1, and the worktable 1 is also provided with a first driving component 5 for driving the placement plate 4 to slide. For example, a cylinder or other means can be used to control the movement of the placement plate 4. By allowing the PCB board to move during trimming, the PCB board can be actively adapted to the working position of the laser, thereby preventing errors in working accuracy caused by repeated laser movement.

[0030] This utility model provides a voltage stabilization control mechanism for laser trimming. To stably control the temperature of the coolant in the cooling tank 6, a cooling mechanism can be set up to actively cool the liquid in the cooling tank 6. For this purpose, a semiconductor cooling chip 7 can be attached to the wall of the cooling tank 6, with the cooling surface of the semiconductor cooling chip 7 in contact with the wall of the cooling tank 6, so that the cooling surface can be used directly to cool the liquid. In order to prevent the semiconductor cooling chip 7 from overheating, a heat sink 8 is provided on the heating surface of the semiconductor cooling chip 7. In order to allow the gas to fully exchange heat with the liquid, the position of the gas inlet pipe in the liquid is located close to the semiconductor cooling chip 7. Through this position design, heat exchange between the gas and the liquid at a lower temperature can be ensured, which helps to reduce the temperature of the gas outlet. Through the generation of bubbles, the liquid in the cooling tank 6 can be dynamically flowed, preventing local overheating from affecting the heat exchange. As a preferred implementation of this solution, a bubble stone can be placed at the bottom of the air inlet pipe, and the residence time of the bubbles in the coolant should be increased as much as possible to ensure sufficient heat exchange and cooling. At the air outlet, a corresponding temperature sensor can be installed to provide temperature feedback and prevent abnormal rise in the blowing temperature. When the temperature is abnormal, maintenance should be carried out in time to ensure the effective progress of laser adjustment work.

[0031] This utility model provides a voltage stabilization control mechanism for laser trimming. To allow the air blowing pipe 21 to adapt to various positions for blowing air onto the PCB board, the mechanism also includes a pointing bracket assembly and an air pipe positioning frame 13. Figure 3 As shown, an air tube positioning frame 13 is set to fix the blowing end of the air tube 21, and a pointing bracket assembly is set including a second drive assembly 9, a third drive assembly 10, and a fourth drive assembly 22. The second drive assembly 9, the third drive assembly 10, and the fourth drive assembly 22 are used to drive the air tube positioning frame 13 to move in space, thereby enabling the air tube 21 to blow air onto the PCB board at various positions. Each drive assembly can be precisely controlled and braked by a servo motor, or it can be driven by a corresponding cylinder group. The specific setting method is not limited here.

[0032] This utility model provides a voltage stabilizing control mechanism for laser trimming. To facilitate adjustment of the blowing angle of the air blowing pipe 21, the driving end of the fourth driving component 22 and the air pipe positioning frame 13 are fixedly connected. Preferably, the fourth driving component 22 can directly control the lifting and lowering of the air blowing pipe 21. The fourth driving component 22 and the third driving component 10 are connected by an angle adjustment component. The air blowing angle of the air blowing pipe 21 is adjusted by setting an angle adjustment component on the third driving component 10 to adjust the angle of the fourth driving component 22. At this time, the second driving component 9 and the third driving component 10 are used to control the air blowing pipe 21 to adjust in the horizontal X and Y directions. This allows for timely adjustment of the blowing angle during laser trimming, which helps prevent interference with the laser trimming work and also helps to blow away impurities in a certain direction, ensuring reliable and effective progress of the trimming work. Specifically, the angle adjustment component includes a first connecting plate 11 installed at the output end of the third driving component 10 and a second connecting plate 12 installed at the fixed end of the fourth driving component 22. Figure 3 As shown, sector plates 14 are fixedly installed on both the first connecting plate 11 and the second connecting plate 12. Multiple sector plates 14 are coaxially hinged and rotated so that the first connecting plate 11 and the second connecting plate 12 can rotate along the hinge axis. At least one sector plate 14 has an arc groove, and a sliding rod that is slidably disposed inside the arc groove is installed on the other sector plate 14. The arc groove provides a rotation position limit. Finally, a fifth drive assembly 15 is installed on the first connecting plate 11. A connecting rod 23 that is hinged to the second connecting plate 12 is rotatably disposed at the output end of the fifth drive assembly 15. By reciprocating the pull of the output end of the fifth drive assembly 15, the angle of the connecting rod 23 can be changed, thereby driving the hinge axis to rotate, and then driving the fourth drive assembly 22 to drive the positioning frame 13 to adjust the angle.

[0033] This utility model provides a voltage stabilizing control mechanism for laser trimming. To facilitate the detection of whether there is bad solder slag on the PCB board that affects the trimming accuracy, a vision camera 16 is also installed on the mounting frame 2. By visual judgment, if solder slag is present, the PCB board may have poor trimming, and a power-on test or rework is required. Specifically, to protect the lens during soldering, a protective cover 17 is preferably slidably installed on the mounting frame 2. To automatically realize the automatic protection function of the protective cover 17 during operation, a sixth driving component 18 for driving the protective cover 17 to shield the lens of the vision camera 16 is also installed on the mounting frame 2. It can also be controlled by a cylinder or other means.

[0034] This utility model provides a pressure stabilization control mechanism for laser trimming. In order to facilitate the collection of blown-off slag and prevent it from falling on the workbench 1 and affecting the operation of the mechanism, the mechanism also includes a blower assembly 20. Specifically, an exhaust pipe 19 connected to the blower assembly 20 is also provided on the workbench 1 at a position corresponding to the placement plate 4.

[0035] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A voltage regulation control mechanism for laser trimming, characterized in that, The device includes a workbench (1) and a mounting bracket (2) mounted on the workbench (1). The mounting bracket (2) is equipped with a laser (3). The workbench (1) is equipped with a placement plate (4) for placing PCB boards. The placement plate (4) is located within the working area of ​​the laser (3). The workbench (1) is also equipped with an air blowing assembly, which includes an air inlet pipe, a cooling box (6), and an air blowing pipe (21). The cooling box (6) contains coolant. The air inlet pipe and the air blowing pipe (21) are both connected to the cooling box (6). The pipe of the air inlet pipe is inserted into the coolant. The air blowing pipe (21) points to the position of the placement plate (4).

2. The voltage regulation control mechanism for laser trimming according to claim 1, characterized in that, A drying mechanism is provided on the air blowing pipe (21) section or the air blowing end of the cooling box (6), and the drying mechanism includes at least a storage component that can be ventilated and can contain desiccant.

3. The voltage regulation control mechanism for laser trimming according to claim 1, characterized in that, The placement plate (4) is slidably disposed on the workbench (1), and the workbench (1) is also provided with a first driving component (5) for driving the placement plate (4) to slide.

4. The voltage regulation control mechanism for laser trimming according to claim 1, characterized in that, The wall of the cooling box (6) is fitted with a semiconductor refrigeration chip (7), the cooling surface of the semiconductor refrigeration chip (7) is attached to the wall of the cooling box (6), and the heating surface of the semiconductor refrigeration chip (7) is provided with a heat sink (8). The air inlet pipe is inserted into the liquid at a position close to the semiconductor refrigeration chip (7).

5. A voltage regulation control mechanism for laser trimming according to claim 1, characterized in that, It also includes a pointing bracket assembly and an airway positioning frame (13), the airway positioning frame (13) being used to fix the blowing end of the blowing tube (21), the pointing bracket assembly including a second drive assembly (9), a third drive assembly (10) and a fourth drive assembly (22), the second drive assembly (9), the third drive assembly (10) and the fourth drive assembly (22) being used to drive the airway positioning frame (13) to move in space.

6. A voltage regulation control mechanism for laser trimming according to claim 5, characterized in that, The driving end of the fourth drive assembly (22) is fixedly connected to the tracheal positioning frame (13). The fourth drive assembly (22) and the third drive assembly (10) are connected by an angle adjustment assembly. The angle adjustment assembly includes a first connecting plate (11) installed at the output end of the third drive assembly (10) and a second connecting plate (12) installed at the fixed end of the fourth drive assembly (22). A sector plate (14) is fixedly installed on both the first connecting plate (11) and the second connecting plate (12). Multiple sector plates (14) are coaxially hinged and rotated. At least one of the sector plates (14) has an arc groove, and another sector plate (14) has a sliding rod that is slidably disposed inside the arc groove. A fifth drive assembly (15) is installed on the first connecting plate (11). The output end of the fifth drive assembly (15) is rotatably provided with a connecting rod (23) that is hinged to the second connecting plate (12).

7. A voltage regulation control mechanism for laser trimming according to claim 1, characterized in that, A vision camera (16) is also mounted on the mounting bracket (2), a protective cover (17) is also slidably mounted on the mounting bracket (2), and a sixth drive assembly (18) for driving the protective cover (17) to cover the lens of the vision camera (16) is also mounted on the mounting bracket (2).

8. A voltage regulation control mechanism for laser trimming according to claim 1, characterized in that, It also includes a fan assembly (20), and an exhaust pipe (19) connected to the fan assembly (20) is provided on the workbench (1) at the position corresponding to the placement plate (4).

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