PCB board displacement detection device and method

Abstract

The application relates to a PCB displacement detection device and method, which comprises a workbench, a driving mechanism, a transmission mechanism, a light projecting sensor and a light receiving sensor; the transmission mechanism is connected with the driving mechanism, the light projecting sensor is connected with the transmission mechanism, and the transmission mechanism can drive the light projecting sensor to rotate; the light receiving sensor is connected with the workbench and located at one side of the PCB; wherein the transmission mechanism is driven by the driving mechanism and drives the light projecting sensor to rotate, so that the light projecting sensor is rotated to the side of the PCB which is away from the light receiving sensor, so that the PCB is located between the light projecting sensor and the light receiving sensor; the light receiving sensor receives the light emitted from the light projecting sensor, and the displacement change of the PCB is detected by detecting the change of the light quantity. The application can monitor whether the PCB relative to the bearing surface has relative displacement in the plate making process in real time, and solves the problem that the upper computer cannot obtain the information that the PCB displacement exists after the PCB is used with the adsorption system or the clamping mechanism in the LDI industry.

Description

Technical Field

[0001] This invention relates to the field of PCB board displacement detection technology, and in particular to a PCB board displacement detection device and method. Background Technology

[0002] When performing exposure operations with an LDI (laser direct imaging) exposure machine, mark alignment is required before exposure imaging. During this process, the PCB board must not undergo any relative displacement on the suction cup. That is, after alignment, the mark information on the PCB has been acquired, and the equipment has identified the current coordinate position of the PCB board relative to the entire machine. It then transmits the corresponding position data to the imaging system to generate image information for that position. If, after the image data has been generated, the PCB board is moved during the exposure process by the stage, causing displacement of the PCB board relative to its supporting surface, the corresponding position of the exposed image on the PCB will be offset, resulting in a scrapped board.

[0003] To address the relative displacement of PCBs during alignment and exposure transport, existing technologies use adsorption systems or clamping mechanisms to secure the PCBs and ensure they remain stationary relative to the support surface throughout the exposure process. However, in practice, insufficient adsorption force or loosening of the clamping mechanism can still lead to PCB displacement. Since these systems assume no displacement, even if exposure misalignment occurs due to PCB displacement, the equipment cannot detect it or issue an error message. The defective PCBs then proceed to the next process, ultimately resulting in scrap. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a PCB board displacement detection device and method, which can monitor in real time whether the PCB board has undergone relative displacement with respect to the bearing surface during the board manufacturing process. This solves the problem in the LDI industry where PCB board displacement still exists even after the use of adsorption systems or clamping mechanisms, but the host computer cannot obtain this information.

[0005] Specifically, the following technical solutions are included:

[0006] On one hand, the present invention provides a PCB board displacement detection device, comprising:

[0007] The workbench is used to support the PCB board;

[0008] The drive mechanism is connected to the worktable;

[0009] A transmission mechanism connected to the drive mechanism, the transmission mechanism being configured to receive power from the drive mechanism and rotate;

[0010] A light-emitting sensor is connected to the transmission mechanism, which enables the light-emitting sensor to rotate; and

[0011] A light sensor is connected to the worktable and located on one side of the PCB board;

[0012] The transmission mechanism is driven by the drive mechanism and drives the light-emitting sensor to rotate, so that the light-emitting sensor rotates to the side of the PCB board away from the light-receiving sensor, so that the PCB board is located between the light-emitting sensor and the light-receiving sensor. The light-receiving sensor receives the light emitted from the light-emitting sensor and detects the displacement change of the PCB board by detecting the change in the amount of light received by the light-receiving sensor.

[0013] In some embodiments, the light-emitting sensor and the light-receiving sensor are distance sensors.

[0014] In some embodiments, a notch is provided on one side of the worktable, the notch being located between the light-emitting sensor and the light-receiving sensor, so that light emitted by the light-emitting sensor can pass through the notch and enter the light-receiving sensor.

[0015] In some embodiments, the workbench is provided with baffles on both sides, and the baffles are provided with scales. The baffles are used to measure the size of the PCB board and to limit the position of the PCB board.

[0016] In some embodiments, a fixing plate is also included, which is fixedly connected to one side of the worktable, and the drive mechanism and the conveying mechanism are disposed on the fixing plate.

[0017] In some embodiments, the drive mechanism includes a motor and a cylinder.

[0018] In some embodiments, the transmission mechanism includes a first pulley, a second pulley, and a conveyor belt. The first pulley and the second pulley are connected by the conveyor belt. The first pulley is connected to a drive mechanism. The second pulley is connected to a rotating shaft. A fixing member is connected to one end of the rotating shaft away from the second pulley. The light-emitting sensor is fixedly connected to the fixing member.

[0019] On the other hand, the present invention provides a PCB board displacement detection method, which employs the aforementioned PCB board displacement detection device and includes the following steps:

[0020] Step 1: The drive mechanism drives the light sensor to rotate through the transmission mechanism. After the light sensor is in a vertical position, the PCB board is placed on the worktable.

[0021] Step 2: The drive mechanism drives the light-emitting sensor to rotate through the transmission mechanism, so that the light-emitting sensor is in a horizontal state. After the light-emitting sensor and the light-receiving sensor are aligned, the light-emitting sensor enters the working state and records the current feedback value 'a' of the light-receiving sensor.

[0022] Step 3: The worktable moves the PCB board sequentially to the alignment station and exposure station of the exposure machine, records the current light sensor feedback value b in real time, calculates the value of |ab|, and if |ab| is greater than the set threshold c, the PCB board is prohibited from entering the exposure process.

[0023] In some implementations, in step three, if |ab| is greater than a set threshold c before entering the exposure process, then entering the exposure process is prohibited; if |ab| is less than or equal to the set threshold c, then the exposure process is entered.

[0024] In some implementations, in step three, after the alignment process and entering the exposure process, if |ab| is greater than the set threshold c, the PCB board is prohibited from entering the next production process; if |ab| is less than or equal to the set threshold c, the exposure is completed.

[0025] Based on the above technical solution, this invention can detect PCB board displacement caused by insufficient adsorption force or loose clamping mechanism and generate an error report. This prevents problematic PCB boards from proceeding to the next process and provides feedback on problems with the current adsorption system or clamping mechanism for repair. Furthermore, if relative displacement occurs between alignment and imaging, the PCB board can be refused entry into the exposure process, avoiding the creation of scrap boards. This invention can monitor the relative displacement of the PCB board relative to the bearing surface in real time during the board manufacturing process, solving the problem in the LDI industry where PCB board displacement still exists even after using an adsorption system or clamping mechanism, but the host computer cannot detect this information.

[0026] Furthermore, this invention employs a drive mechanism and a transmission mechanism to rotate the light-emitting sensor, enabling the sensor to switch between vertical and horizontal states. When the PCB board is placed in front of the worktable, the light-emitting sensor is in a vertical position, thus avoiding interference between the sensor and the robotic arm or manual placement of the PCB board, facilitating board placement. After the PCB board is placed on the worktable, the drive mechanism rotates the PCB board via the transmission mechanism, bringing the light-emitting sensor to a horizontal position. The light-emitting sensor and the light-receiving sensor are then on the same vertical plane, aligning with the light source and entering working mode. At this point, the sensor can measure the displacement changes of the PCB board. The structure is simple, easy to use, and provides accurate measurements. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0028] Figure 1 This is a perspective view of the PCB board displacement detection device of the present invention.

[0029] Figure 2 This is a top view of the PCB board displacement detection device of the present invention when the light-emitting sensor is in a vertical state.

[0030] Figure 3 This is a top view of the PCB board displacement detection device of the present invention when the light-emitting sensor is in a horizontal state.

[0031] Figure 4 This is a schematic diagram illustrating the working principle of the sensor in this invention for measuring the displacement of a PCB board.

[0032] Figure 5 This is a diagram showing the positional relationship between the light-emitting sensor, the light-receiving sensor, and the PCB board when the light-emitting sensor of this invention is in a vertical state.

[0033] Figure 6 This is a diagram showing the positional relationship between the light-emitting sensor, the light-receiving sensor, and the PCB board when the light-emitting sensor of this invention is in a horizontal state.

[0034] Figure 7 This is a schematic diagram of the drive mechanism and transmission mechanism of the present invention.

[0035] Figure 8 This is a schematic diagram of the PCB board of the present invention when it is in the alignment position of the exposure machine.

[0036] Figure 9 This is a schematic diagram of the PCB board of the present invention when it is in the exposure station of the exposure machine.

[0037] Figure 10 This is a flowchart of the PCB board displacement detection method of the present invention.

[0038] Explanation of reference numerals in the attached drawings: 1. Drive mechanism; 2. Transmission mechanism; 21. First pulley; 22. Second pulley; 23. Conveyor belt; 24. Rotating shaft; 25. Fixing component; 3. Light-emitting sensor; 4. Light-receiving sensor; 5. PCB board; 6. Stop bar; 7. Worktable; 8. Fixing plate; 9. Notch; 10. Exposure machine. Detailed Implementation

[0039] The invention is described in detail below. In the following paragraphs, different aspects of the embodiments are defined in more detail. The aspects so defined may be combined with any other aspect or aspects unless explicitly stated otherwise. In particular, any feature considered preferred or advantageous may be combined with one or more other features considered preferred or advantageous.

[0040] The terms "first" and "second" used in this invention are merely for ease of description and to distinguish different components with the same name, and do not indicate a sequential or primary / secondary relationship.

[0041] Furthermore, when an element is referred to as being "on" another element, the element may be directly on the other element, or it may be indirectly on the other element with one or more intermediate elements inserted between them. Additionally, when an element is referred to as being "connected" to another element, the element may be directly connected to the other element, or it may be indirectly connected to the other element with one or more intermediate elements inserted between them. In the following drawings, the same reference numerals denote the same elements.

[0042] The present invention uses terms such as "upper", "lower", "top", "bottom", "front", "rear", "inner" and "outer" to indicate orientation or positional relationships. This is only for the convenience of describing the present invention and is not intended to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of the present invention.

[0043] like Figure 1-7 As shown, the present invention provides a PCB board displacement detection device, which in some embodiments includes:

[0044] Workbench 7 is used to support PCB board 5;

[0045] Drive mechanism 1 is connected to the worktable 7;

[0046] A transmission mechanism 2 is connected to the drive mechanism 1, and the transmission mechanism 2 is configured to receive power from the drive mechanism 1 and rotate.

[0047] The light-emitting sensor 3 is connected to the transmission mechanism 2, which enables the light-emitting sensor 3 to rotate; and

[0048] A light sensor 4 is connected to the worktable 7 and located on one side of the PCB board 5;

[0049] The transmission mechanism 2 is driven by the drive mechanism 1 and drives the light-emitting sensor 3 to rotate, so that the light-emitting sensor 3 rotates to the side of the PCB board 5 away from the light-receiving sensor 4, so that the PCB board 5 is located between the light-emitting sensor 3 and the light-receiving sensor 4. The light-receiving sensor 4 receives the light emitted from the light-emitting sensor 3, and detects the displacement change of the PCB board 5 by detecting the change in the amount of light received by the light-receiving sensor 4.

[0050] This embodiment of the invention uses sensors to detect the displacement of the PCB board 5. The displacement change of the PCB board 5 can be measured when the light-emitting sensor 3 and the light-receiving sensor 4 are on the same working surface. When the PCB board 5 moves relative to the light-emitting sensor 4, the amount of light transmitted from the light-emitting sensor 3 to the light-receiving sensor 4 changes, which is then converted into the displacement of the PCB board 5. In this way, it is possible to monitor in real time whether the relative displacement of the PCB board 5 with respect to the bearing surface of the worktable 7 has occurred during the board fabrication process.

[0051] Furthermore, in this embodiment of the invention, a drive mechanism 1 and a transmission mechanism 2 are used to rotate the light-emitting sensor 3, enabling the light-emitting sensor 3 to switch between a vertical and a horizontal state. When the PCB board 5 is placed in front of the worktable 7, the light-emitting sensor 3 is in a vertical state, i.e., perpendicular to the worktable 7. This avoids interference between the light-emitting sensor 3 and the robotic arm or manual placement of the PCB board, facilitating board placement. After the PCB board 5 is placed on the worktable 7, the drive mechanism 1 rotates the PCB board 5 via the transmission mechanism 2, causing the light-emitting sensor 3 to be in a horizontal state. This means the light-emitting sensor 3 is parallel to the worktable 7, the PCB board 5, and the light-receiving sensor 4, and the light-emitting sensor 3 and the light-receiving sensor 4 are on the same vertical plane. After being aligned with light, it enters the working state, at which point the displacement change of the PCB board 5 can be measured by the sensor.

[0052] Optionally, the light-emitting sensor 3 and the light-receiving sensor 4 are ranging sensors, such as laser ranging sensors.

[0053] Optionally, in some embodiments, a notch 9 is provided on one side of the workbench 7, the notch 9 being located between the light-emitting sensor 3 and the light-receiving sensor 4, so that the light emitted by the light-emitting sensor 3 can pass through the notch 9 and enter the light-receiving sensor 4.

[0054] Optionally, in some embodiments, baffles 6 are provided on both sides of the workbench 7, and the baffles 6 are provided with scales. The baffles 6 are used to measure the dimensions of the PCB board 5 and to limit the position of the PCB board 5. When placing the board, the PCB board 5 is placed close to the baffles 6 on both sides of the workbench 7.

[0055] Optionally, in some embodiments, a fixing plate 8 is further included, which is fixedly connected to one side of the workbench 7, and the drive mechanism 1 and the conveying mechanism 2 are disposed on the fixing plate 8.

[0056] Optionally, in some embodiments, the drive mechanism 1 includes, but is not limited to, a motor, a cylinder, etc.

[0057] Optionally, the transmission mechanism 2 includes a first pulley 21, a second pulley 22, and a conveyor belt 23. The first pulley 21 and the second pulley 22 are connected by the conveyor belt 23. The first pulley 21 is connected to the drive mechanism 1. The second pulley 22 is connected to a rotating shaft 24. A fixing member 25 is connected to one end of the rotating shaft 24 away from the second pulley 22. The light-emitting sensor 3 is fixedly connected to the fixing member 25.

[0058] The drive mechanism 1 drives the first pulley 21 to rotate, the first pulley 21 drives the second pulley 22 to rotate via the conveyor belt 23, and the second pulley 22 drives the fixed part 25 and the light-emitting sensor 3 connected to the fixed part 25 to rotate via the rotating shaft 24, thereby realizing the switching of the light-emitting sensor 3 between the vertical state and the horizontal state.

[0059] Finally, as Figure 8-10 As shown, the present invention also provides a PCB board displacement detection method, which uses the PCB board displacement detection device described in the above embodiments. In some embodiments, it includes the following steps:

[0060] Step 1: The drive mechanism drives the light sensor to rotate through the transmission mechanism. After the light sensor is in a vertical position, the PCB board is placed on the worktable.

[0061] Step 2: The drive mechanism drives the light-emitting sensor to rotate through the transmission mechanism, so that the light-emitting sensor is in a horizontal state. After the light-emitting sensor and the light-receiving sensor are aligned, the light-emitting sensor enters the working state and records the current feedback value 'a' of the light-receiving sensor.

[0062] Step 3: The worktable moves the PCB board sequentially to the alignment station and exposure station of the exposure machine 10, records the current light sensor feedback value b in real time, calculates the value of |ab|, and if |ab| is greater than the set threshold c, the PCB board is prohibited from entering the exposure process.

[0063] In step three, if |ab| is greater than the set threshold c before entering the exposure process, the exposure process is prohibited, the worktable pulls the PCB board out, and it is re-clamped and adsorbed before step three is executed again; if |ab| is less than or equal to the set threshold c, the exposure process is entered.

[0064] In step three, after the alignment process and entering the exposure process, if |ab| is greater than the set threshold c, a problem board is recorded, and this PCB board is prohibited from entering the next production process. It is then washed and remade. If |ab| is less than or equal to the set threshold c, the exposure is complete.

[0065] Steps one through three are executed sequentially. This embodiment can detect PCB board displacement caused by insufficient adsorption force or loose clamping mechanism and generate an error report. This prevents problematic PCB boards from proceeding to the next process and provides feedback on problems with the current adsorption system or clamping mechanism for repair. Furthermore, if relative displacement occurs between alignment and imaging, the PCB board can be refused entry into the exposure process, avoiding the creation of scrap boards. This invention can monitor the relative displacement of the PCB board relative to the bearing surface in real time during the board fabrication process, solving the problem in the LDI industry where PCB board displacement still exists even after using an adsorption system or clamping mechanism, but the host computer cannot detect this information.

[0066] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

[0068] This document uses specific embodiments to illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely illustrative and are intended to aid in understanding the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A PCB board displacement detection device, characterized in that, include: The workbench is used to support the PCB board; The drive mechanism is connected to the worktable; A transmission mechanism connected to the drive mechanism, the transmission mechanism being configured to receive power from the drive mechanism and rotate; A light-emitting sensor is connected to the transmission mechanism, which enables the light-emitting sensor to rotate; and A light sensor is connected to the worktable and located on one side of the PCB board; The transmission mechanism is driven by the drive mechanism and drives the light-emitting sensor to rotate, so that the light-emitting sensor rotates to the side of the PCB board away from the light-receiving sensor, so that the PCB board is located between the light-emitting sensor and the light-receiving sensor. The light-receiving sensor receives the light emitted from the light-emitting sensor and detects the displacement change of the PCB board by detecting the change in the amount of light received by the light-receiving sensor.

2. The PCB board displacement detection device according to claim 1, characterized in that, The light-emitting sensor and the light-receiving sensor are distance measuring sensors.

3. The PCB board displacement detection device according to claim 1, characterized in that, A notch is provided on one side of the workbench, which is located between the light-emitting sensor and the light-receiving sensor, so that the light emitted by the light-emitting sensor can pass through the notch and enter the light-receiving sensor.

4. The PCB board displacement detection device according to claim 1, characterized in that, The workbench is equipped with baffles on both sides, and the baffles are equipped with scales. The baffles are used to measure the size of the PCB board and to limit the position of the PCB board.

5. The PCB board displacement detection device according to claim 1, characterized in that, It also includes a fixing plate, which is fixedly connected to one side of the worktable, and the drive mechanism and the conveying mechanism are disposed on the fixing plate.

6. The PCB board displacement detection device according to any one of claims 1-5, characterized in that, The drive mechanism includes a motor and a cylinder.

7. The PCB board displacement detection device according to any one of claims 1-5, characterized in that, The transmission mechanism includes a first pulley, a second pulley, and a conveyor belt. The first pulley and the second pulley are connected by the conveyor belt. The first pulley is connected to the drive mechanism. The second pulley is connected to a rotating shaft. A fixing member is connected to the end of the rotating shaft away from the second pulley. The light-emitting sensor is fixedly connected to the fixing member.

8. A method for detecting displacement of a PCB board, characterized in that, The PCB board displacement detection device according to any one of claims 1-7 includes the following steps: Step 1: The drive mechanism drives the light sensor to rotate through the transmission mechanism. After the light sensor is in a vertical position, the PCB board is placed on the worktable. Step 2: The drive mechanism drives the light-emitting sensor to rotate through the transmission mechanism, so that the light-emitting sensor is in a horizontal state. After the light-emitting sensor and the light-receiving sensor are aligned, the light-emitting sensor enters the working state and records the current feedback value 'a' of the light-receiving sensor. Step 3: The worktable moves the PCB board sequentially to the alignment station and exposure station of the exposure machine, records the current light sensor feedback value b in real time, calculates the value of |ab|, and if |ab| is greater than the set threshold c, the PCB board is prohibited from entering the exposure process.

9. A PCB board displacement detection method according to claim 8, characterized in that, In step three, if |ab| is greater than the set threshold c before entering the exposure process, then entering the exposure process is prohibited. If |ab| is less than or equal to the set threshold c, then the exposure process begins.

10. A PCB board displacement detection method according to claim 8, characterized in that, In step three, after the alignment process and entering the exposure process, if |ab| is greater than the set threshold c, the PCB board is prohibited from entering the next production process; if |ab| is less than or equal to the set threshold c, the exposure is completed.

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