Detection device suitable for flexible printed circuit board

Abstract

The utility model discloses a detection device suitable for a flexible printed circuit board. The detection device comprises a clamping mechanism, a roller mechanism, a jacking mechanism, a light source, an image acquisition mechanism and a controller, the clamping mechanism is used for clamping two ends of the to-be-tested flexible printed circuit board; the jacking mechanism is connected with the roller mechanism, is used for driving the roller mechanism to be in contact with the to-be-tested flexible printed circuit board, can roll along the axial extension direction of the to-be-tested flexible printed circuit board, and ensures that the to-be-tested flexible printed circuit board is always in a tensioned state in the rolling process; the light source is fixedly connected with the jacking mechanism; the image acquisition mechanism is fixedly connected with the jacking mechanism; and the controller is respectively connected with the clamping mechanism, the jacking mechanism, the light source and the image acquisition mechanism. According to the utility model, light and shade distribution caused by wrinkles of the flexible printed circuit board can be reduced, and the accuracy of a detection result is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of PFC testing technology, specifically relating to a testing device suitable for flexible printed circuit boards. Background Technology

[0002] With the development of computer vision technology and the increase in labor costs, more and more manufacturing companies are choosing to introduce various automated optical inspection (AOI) equipment to replace manual visual inspection of various quality and appearance aspects. In existing technologies, the appearance inspection of flexible printed circuit boards (PCBs) typically involves simply laying the PCB flat and then using an area scan camera or line scan camera with a suitable light source to image and acquire the picture. Because flexible PCBs are soft and prone to wrinkling, this affects the light and dark distribution of the image, thus impacting the visual defect detection results, which are dependent on image quality. Utility Model Content

[0003] To address the aforementioned problems, this utility model proposes a testing device suitable for flexible printed circuit boards, which can reduce the light and dark distribution caused by wrinkles in flexible printed circuit boards and greatly improve the accuracy of testing results.

[0004] To achieve the above-mentioned technical objectives and effects, this utility model is implemented through the following technical solution:

[0005] In a first aspect, this utility model provides a testing device suitable for flexible printed circuit boards, comprising:

[0006] Clamping mechanism, used to clamp both ends of the flexible printed circuit board to be tested;

[0007] Roller mechanism;

[0008] The lifting mechanism, connected to the roller mechanism, is used to drive the roller mechanism to contact the flexible printed circuit board under test, and can roll along the axial extension direction of the flexible printed circuit board under test, ensuring that the flexible printed circuit board under test is always in a tensioned state during the rolling process.

[0009] The light source is fixedly connected to the lifting mechanism;

[0010] The image acquisition mechanism is fixedly connected to the lifting mechanism;

[0011] The controller is connected to the clamping mechanism, the lifting mechanism, the light source, and the image acquisition mechanism, respectively.

[0012] In conjunction with the first aspect, optionally, the clamping mechanism includes a first clamping unit and a second clamping unit disposed opposite to each other, wherein the first clamping unit and the second clamping unit have the same structure and both include:

[0013] The first linear module moves in the same direction as the extension direction of the flexible printed circuit board under test.

[0014] The second linear module is connected to the first linear module, and the movement directions of the two are perpendicular to each other on the same horizontal plane, used to adjust the state of the flexible printed circuit board under test.

[0015] The gripper is connected to the second linear module and is used to connect to one end of the flexible printed circuit board to be tested.

[0016] In conjunction with the first aspect, optionally, the detection device further includes a tension sensor, which is disposed on the first clamping unit and / or the second clamping unit, for real-time monitoring of the tension force of the flexible printed circuit board under test and sending it to the controller.

[0017] In conjunction with the first aspect, optionally, when the controller detects that the tension of the flexible printed circuit board under test exceeds a set threshold, it controls the lifting mechanism to stop driving the roller mechanism to continue applying tension to the flexible printed circuit board under test.

[0018] In conjunction with the first aspect, optionally, the lifting mechanism includes:

[0019] The cylinder's driving direction is perpendicular to the extension direction of the flexible printed circuit board under test in a vertical plane.

[0020] The third linear module is connected to the cylinder, and its movement direction is the same as the extension direction of the flexible printed circuit board under test. It is used to drive the roller mechanism to roll along the axial extension direction of the flexible printed circuit board under test.

[0021] The fourth linear module is connected to the third linear module, and the two move in the same horizontal plane and are perpendicular to each other. It is used to drive the roller mechanism to move to contact the flexible printed circuit board under test, or to drive the roller mechanism to separate from the flexible printed circuit board under test.

[0022] The support unit is connected to the fourth linear module, the roller mechanism, the light source, and the image acquisition mechanism, respectively.

[0023] In conjunction with the first aspect, optionally, the light source is located above the roller mechanism.

[0024] In conjunction with the first aspect, optionally, the image acquisition mechanism is located above the roller mechanism and near the light source.

[0025] In conjunction with the first aspect, the testing device may optionally include a placement platform for placing the flexible printed circuit board to be tested.

[0026] Secondly, this utility model provides a testing method suitable for flexible printed circuit boards, including:

[0027] The controller controls the clamping mechanism to clamp both ends of the flexible printed circuit board to be tested;

[0028] The controller controls the lifting mechanism to drive the roller mechanism to contact the flexible printed circuit board under test and roll along the axial extension direction of the flexible printed circuit board under test. During the rolling process, the flexible printed circuit board under test is always kept in a tensioned state.

[0029] The flexible printed circuit board under test is illuminated by a light source connected to the lifting mechanism.

[0030] The image acquisition mechanism connected to the lifting mechanism acquires surface images of the flexible printed circuit board under test and sends them to the controller to generate test results.

[0031] In conjunction with the second aspect, the detection method may optionally further include:

[0032] The tension force of the flexible printed circuit board under test is monitored in real time using a tension sensor and sent to the controller.

[0033] When the controller detects that the tension of the flexible printed circuit board under test exceeds the set threshold, it controls the lifting mechanism to stop driving the roller mechanism to continue applying tension to the flexible printed circuit board under test.

[0034] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0035] This invention first utilizes a controller to control a clamping mechanism to clamp both ends of the flexible printed circuit board (PCB) under test. Then, the controller controls a lifting mechanism to drive a roller mechanism to contact the PCB and roll along its axial extension direction, ensuring the PCB remains under tension throughout the rolling process. Simultaneously, a light source connected to the lifting mechanism illuminates the PCB. An image acquisition mechanism connected to the lifting mechanism acquires a surface image of the PCB and sends it to the controller to generate a test result. This invention achieves a certain degree of tension on the PCB without damaging it, reducing wrinkles and creating an image for subsequent visual inspection. It also reduces the light and dark distribution caused by wrinkles on the PCB, significantly improving the accuracy of the test results. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0037] Figure 1 This is a schematic diagram of the structure of a testing device for flexible printed circuit boards according to an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram showing the flexible printed circuit board placed in a tray in one embodiment of the present invention.

[0039] in:

[0040] 1- Tray; 2- Flexible printed circuit board to be tested; 3- Gripper; 4- Tension sensor; 5- First linear module; 6- Second linear module; 7- Placement platform; 701- First placement plate; 702- Second placement plate; 703- Support plate; 8- Third linear module; 9- Fourth linear module; 10- Support unit; 11- Cylinder; 12- Image acquisition mechanism; 13- Roller mechanism; 14- Light source. Detailed Implementation

[0041] 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0042] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may include different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0043] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0044] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] The application principle of this utility model will be described in detail below with reference to the accompanying drawings. Example

[0046] This utility model provides a testing device suitable for flexible printed circuit boards, such as... Figure 1 As shown, it includes: a clamping mechanism, a roller mechanism 13, a lifting mechanism, a light source 14, an image acquisition mechanism 12, and a controller (not shown in the figure).

[0047] The clamping mechanism is used to clamp both ends of the flexible printed circuit board 2 to be tested;

[0048] The roller mechanism 13 is parallel to the flexible printed circuit board 2 to be tested;

[0049] The lifting mechanism is connected to the roller mechanism 13, which drives the roller mechanism 13 to contact the flexible printed circuit board 2 under test, and can roll along the axial extension direction of the flexible printed circuit board 2 under test. During the rolling process, the flexible printed circuit board 2 under test is always kept in a tensioned state. The reason why the roller mechanism 13 is selected in this utility model is to reduce the wear of the flexible printed circuit board 2 under test while maintaining the predetermined tension during the rolling process along the axial extension direction of the flexible printed circuit board 2 under test.

[0050] The light source 14 is fixedly connected to the lifting mechanism;

[0051] The image acquisition mechanism 12 is fixedly connected to the lifting mechanism; in specific implementation, the image acquisition mechanism 12 can be a line scan camera or other image acquisition device that can realize image acquisition function;

[0052] The controller is connected (i.e., electrically connected) to the clamping mechanism, the lifting mechanism, the light source 14 and the image acquisition mechanism 12 respectively.

[0053] Based on the testing device for flexible printed circuit boards (PCBs) in this embodiment, the controller first controls the clamping mechanism to clamp both ends of the PCB 2 to be tested. Then, the controller controls the lifting mechanism to drive the roller mechanism 13 to contact one end of the PCB 2 and roll it along the axial extension direction of the PCB 2 to the other end, ensuring that the PCB 2 remains taut throughout the rolling process. Simultaneously, the light source 14 connected to the lifting mechanism illuminates the PCB 2, and the image acquisition mechanism 12 connected to the lifting mechanism acquires the surface image of the PCB 2 and sends it to the controller to generate the test result. This achieves a certain degree of tension on the PCB without damaging it, reducing wrinkles and creating an image for subsequent visual inspection.

[0054] In one specific embodiment of this utility model, such as Figure 1 As shown, the testing device also includes a placement platform 7, which is used to place the flexible printed circuit board 2 to be tested. In a specific implementation, the placement platform 7 may include a first placement plate 701 and a second placement plate 702 that are parallel to each other, with the second placement plate 702 located below the first placement plate 701. A support plate 703 is provided between the first placement plate 701 and the second placement plate 701. The number of support plates 703 can be one or more, depending on the actual situation. The second placement plate 702 can be used to install a clamping mechanism and a lifting mechanism.

[0055] In one specific embodiment of this utility model, such as Figure 1 As shown, the clamping mechanism includes a first clamping unit and a second clamping unit arranged opposite to each other. The first clamping unit and the second clamping unit have the same structure, both including: a first linear module 5, a second linear module 6 and a gripper 3.

[0056] The first linear module 5 moves in the same direction as the extension direction of the flexible printed circuit board 2 to be tested; in specific implementation, the first linear module 5 can be installed on the second support plate 702 of the platform 7.

[0057] The second linear module 6 is connected to the first linear module 5, and their movement directions are perpendicular to each other on the same horizontal plane, which is used to adjust the state of the flexible printed circuit board 2 under test.

[0058] The gripper 3 is connected to the second linear module 6 and is used to connect to one end of the flexible printed circuit board 2 to be tested; the line connecting the two grippers 3 is parallel to the axis of the flexible printed circuit board 2 to be tested.

[0059] In practical use, the first clamping unit and the second clamping unit respectively use the jaws 3 to clamp the two ends of the flexible printed circuit board 2 to be tested; then the controller controls the first linear module 5 and the second linear module 6 to move, so that the flexible printed circuit board 2 to be tested moves to the designated position on the placement platform 7, and so that the flexible printed circuit board 2 to be tested is in a slightly tense state.

[0060] In one specific embodiment of this utility model, to ensure that the tension force received by the flexible printed circuit board 2 under test is less than a set threshold, and to prevent the flexible printed circuit board 2 from being damaged due to excessive force, the detection device further includes a tension sensor 4. The tension sensor 4 is disposed on the first clamping unit and / or the second clamping unit, and is used to monitor the tension force of the flexible printed circuit board 2 under test in real time and send it to the controller. When the controller detects that the tension force of the flexible printed circuit board 2 under test exceeds the set threshold, it controls the lifting mechanism to stop driving the roller mechanism 13 to continue applying tension force to the flexible printed circuit board 2 under test.

[0061] In one specific embodiment of this utility model, the lifting mechanism includes: a cylinder 11, a third linear module 8, a fourth linear module 9, and a support unit 10;

[0062] The driving direction of the cylinder 11 is perpendicular to the extension direction of the flexible printed circuit board 2 under test in a vertical plane.

[0063] The third linear module 8 is connected to the cylinder 11, and its movement direction is the same as the extension direction of the flexible printed circuit board 2 under test. It is used to drive the roller mechanism 13 to roll along the axial extension direction of the flexible printed circuit board 2 under test.

[0064] The fourth linear module 9 is connected to the third linear module 8, and their movement directions are perpendicular to each other on the same horizontal plane. It is used to drive the roller mechanism 13 to move to contact the flexible printed circuit board 2 under test (i.e., drive the roller mechanism 13 to move towards the flexible printed circuit board 2 under test), or drive the roller mechanism 13 to separate from the flexible printed circuit board 2 under test (i.e., drive the roller mechanism 13 to move away from the flexible printed circuit board 2 under test).

[0065] The support unit 10 is connected to the fourth linear module 9, the roller mechanism 13, the light source 14, and the image acquisition mechanism 12, respectively. In specific implementation, such as... Figure 1 As shown, the support unit 10 includes a support plate and a reinforcing plate. The support plate is perpendicular to the fourth linear module 9, with one end connected to the fourth linear module and the other end connected to the light source 14 and the image acquisition mechanism 12. One end of the reinforcing plate is connected to the fourth linear module, and the other end is connected to the support plate. The roller mechanism 13 is perpendicularly connected to the support plate and parallel to the fourth linear module 9.

[0066] In one specific embodiment of this utility model, during the implementation process, the light source 14 is located above the roller mechanism 13 and is used to irradiate the flexible printed circuit board 2 to be tested; preferably, the light source 14 is located directly above the roller mechanism 13, and its central axis is located on the same vertical plane as the central axis of the roller mechanism 13, which can achieve maximum intensity irradiation of the flexible printed circuit board 2 to be tested and reduce the possibility of light and dark distribution caused by wrinkles.

[0067] In one specific embodiment of this utility model, during the implementation process, the image acquisition mechanism 12 is located above the roller mechanism 13 and near the light source 14.

[0068] The following is combined with Figure 1 The specific structure of the testing device applicable to flexible printed circuit boards is described, and its working principle is explained in detail.

[0069] Material selection: such as Figure 2 As shown, the flexible printed circuit board 2 to be tested is usually placed in the tray 1. The flexible printed circuit board 2 to be tested is picked up from the tray 1 by manual labor or by an automatic mechanical device with suction cups and placed on the storage platform 7.

[0070] Clamp: such as Figure 1As shown, the jaws 3 of the first clamping unit and the second clamping unit clamp the two ends of the flexible printed circuit board 2 to be tested. The first linear module 5 in the first clamping unit and the second clamping unit moves to both sides at the same time to make the flexible printed circuit board 2 to be tested slightly tensioned.

[0071] The roller moves to the initial position: control cylinder 11 descends, and then control the fourth linear module 9 to move the roller mechanism 13 to the lower left of the flexible printed circuit board 2 under test. At the same time, the light source 14 and the image acquisition mechanism 12 (such as a line scan camera) also move to the upper left of the flexible printed circuit board 2 under test.

[0072] The lifting mechanism works to tighten the flexible printed circuit board 2 under test: the control cylinder 11 rises, which in turn drives the third linear module 8 and the fourth linear module 9 to rise together. The fourth linear module 9 moves upward with the roller mechanism 13 through the support unit 10, so that the flexible printed circuit board 2 under test is in a tensioned state.

[0073] Force feedback from tension sensor 4: During the operation of the lifting mechanism, the value of tension sensor 4 is read in real time. When the value of tension sensor 4 is greater than the threshold, the lifting mechanism is controlled to stop lifting, so as to ensure that the flexible printed circuit board 2 under test is taut and is not damaged.

[0074] Image acquisition mechanism 12 moves laterally to acquire images: The third linear module 8 with roller mechanism 13, light source 14 and image acquisition mechanism 12 move from the leftmost end of the flexible printed circuit under test to the rightmost end of the flexible printed circuit under test 2, complete the overall photography of the flexible printed circuit under test 2, and obtain the corresponding image.

[0075] Defect detection: The images obtained by the image acquisition mechanism 12 are subjected to subsequent computer vision processing technology to detect appearance defects.

[0076] Mechanism reset: The third linear module 8, along with the roller mechanism 13, the light source 14, and the image acquisition mechanism 12, returns to its initial position (e.g., the middle of the platform). The cylinder 11 rises to catch the flexible printed circuit 2 to be tested, while the grippers 3 at both ends release the flexible printed circuit to be tested and retract to both sides.

[0077] Material feeding: The tested flexible printed circuit 2 is placed back into the material tray 1 by manual labor or an automatic mechanical device with suction cups, thus completing one image acquisition and visual defect detection of the flexible printed circuit 2. Example

[0078] This utility model provides a testing method suitable for flexible printed circuit boards, including the following steps:

[0079] Place the flexible printed circuit board 2 to be tested on the platform 7;

[0080] The controller controls the clamping mechanism to clamp both ends of the flexible printed circuit board 2 to be tested;

[0081] The controller controls the lifting mechanism to drive the roller mechanism 13 to contact the flexible printed circuit board 2 under test, and rolls along the axial extension direction of the flexible printed circuit board 2 under test. During the rolling process, the flexible printed circuit board 2 under test is always kept in a tensioned state.

[0082] The flexible printed circuit board 2 to be tested is illuminated by a light source 14 connected to the lifting mechanism;

[0083] The image acquisition mechanism 12, which is connected to the lifting mechanism, acquires the surface image of the flexible printed circuit board 2 to be tested and sends it to the controller to generate the test result.

[0084] In one specific embodiment of this utility model, the detection method further includes:

[0085] The tension force of the flexible printed circuit board 2 under test is monitored in real time by the tension sensor 4 and sent to the controller.

[0086] When the controller detects that the tension of the flexible printed circuit board 2 under test exceeds the set threshold, it controls the lifting mechanism to stop driving the roller mechanism 13 to continue applying tension to the flexible printed circuit board 2 under test.

[0087] The detection method for flexible printed circuit boards in this embodiment can be implemented based on the detection device for flexible printed circuit boards in Embodiment 1.

[0088] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used 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. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0089] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A testing device suitable for flexible printed circuit boards, characterized in that, include: Clamping mechanism, used to clamp both ends of the flexible printed circuit board to be tested; Roller mechanism; The lifting mechanism, connected to the roller mechanism, is used to drive the roller mechanism to contact the flexible printed circuit board under test, and can roll along the axial extension direction of the flexible printed circuit board under test, ensuring that the flexible printed circuit board under test is always in a tensioned state during the rolling process. The light source is fixedly connected to the lifting mechanism; The image acquisition mechanism is fixedly connected to the lifting mechanism; The controller is connected to the clamping mechanism, the lifting mechanism, the light source, and the image acquisition mechanism, respectively.

2. The testing device for flexible printed circuit boards according to claim 1, characterized in that: The clamping mechanism includes a first clamping unit and a second clamping unit disposed opposite to each other. The first clamping unit and the second clamping unit have the same structure, both including: The first linear module moves in the same direction as the extension direction of the flexible printed circuit board under test. The second linear module is connected to the first linear module, and the movement directions of the two are perpendicular to each other on the same horizontal plane, used to adjust the state of the flexible printed circuit board under test. The gripper is connected to the second linear module and is used to connect to one end of the flexible printed circuit board to be tested.

3. The testing device for flexible printed circuit boards according to claim 2, characterized in that: The detection device further includes a tension sensor, which is disposed on the first clamping unit and / or the second clamping unit, for real-time monitoring of the tension of the flexible printed circuit board under test and sending the data to the controller.

4. The testing device for flexible printed circuit boards according to claim 3, characterized in that: When the controller detects that the tension of the flexible printed circuit board under test exceeds the set threshold, it controls the lifting mechanism to stop driving the roller mechanism to continue applying tension to the flexible printed circuit board under test.

5. The testing device for flexible printed circuit boards according to claim 1, characterized in that: The lifting mechanism includes: The cylinder's driving direction is perpendicular to the extension direction of the flexible printed circuit board under test in a vertical plane. The third linear module is connected to the cylinder, and its movement direction is the same as the extension direction of the flexible printed circuit board under test. It is used to drive the roller mechanism to roll along the axial extension direction of the flexible printed circuit board under test. The fourth linear module is connected to the third linear module, and the two move in the same horizontal plane and are perpendicular to each other. It is used to drive the roller mechanism to move to contact the flexible printed circuit board under test, or to drive the roller mechanism to separate from the flexible printed circuit board under test. The support unit is connected to the fourth linear module, the roller mechanism, the light source, and the image acquisition mechanism, respectively.

6. The testing device for flexible printed circuit boards according to claim 1, characterized in that: The light source is located above the roller mechanism.

7. The testing device for flexible printed circuit boards according to claim 1, characterized in that: The image acquisition mechanism is located above the roller mechanism and near the light source.

8. The testing device for flexible printed circuit boards according to claim 1, characterized in that: The testing device also includes a placement platform for placing the flexible printed circuit board to be tested.

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