Product detection method and system

Abstract

The invention provides a product detection method and system, and the method is used for carrying out the detection of a PCB before dispensing, and comprises the steps: setting a target detection region on a to-be-detected PCB, and enabling the target detection region to have at least one dispensing detection position; performing visual detection on the dispensing detection position in the target detection area according to a preset rule, and recording a corresponding point position detection result; counting the total number of bad dispensing detection positions in the point position detection result, and determining a detection result of the target detection area according to the total number of the bad dispensing detection positions; wherein when the total number of the bad dispensing detection positions is larger than a preset threshold value, it is judged that detection of the target detection area does not pass, and alarm reminding is carried out; and otherwise, determining that the target detection area passes the detection. According to the invention, the situation of frequent alarm during inspection before dispensing can be solved, and the dispensing efficiency and the equipment OEE are improved.

Description

Technical Field

[0001] The present invention relates to the field of automated production technology, and more specifically, to a product detection method and system. Background Art

[0002] At present, in the PCB production process, the dispensing equipment in the automatic production mode often encounters situations such as PCB material defects or ASIC chips not being pasted in the DB (die bonding, chip pasting) process, which causes the visual inspection system to believe that the PCB has been dispensed with glue, resulting in frequent alarms and reducing the OEE (Overall Equipment Effectiveness) of the equipment.

[0003] Among them, before the dispensing equipment operates, it is necessary to first conduct a pre-dispensing inspection on the ASIC area of a product in the PCB to determine whether the ASIC has been glued to avoid repeated dispensing. If the inspected product has incoming material defects or the ASIC is not attached, the ASIC area will appear black in the visual inspection. After the equipment visual program compares and processes, it is considered that the PCB has been glued, resulting in frequent alarms. At this time, the operator needs to cancel the alarm and start the equipment for re-inspection. This process will increase the equipment alarm rate by about 10%, which not only reduces the equipment OEE, but also is not conducive to the subsequent transformation to a dark factory model. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a product detection method and system to solve the problems of frequent alarms before dispensing of existing products, reduced dispensing quality and efficiency, etc.

[0005] The product detection method provided by the present invention is used for detecting a PCB before glue dispensing, and the method comprises: setting a target detection area on the PCB to be detected, wherein at least one glue dispensing detection position is provided in the target detection area;

[0006] Perform visual inspection on the dispensing detection positions within the target detection area according to preset rules, and record the corresponding point detection results;

[0007] The total number of bad glue dispensing detection positions in the point detection results is counted, and the detection result of the target detection area is determined according to the total number of bad glue dispensing detection positions; wherein,

[0008] When the total number of the defective dispensing detection positions is greater than a preset threshold, it is determined that the target detection area has failed the detection and an alarm is given; otherwise, it is determined that the target detection area has passed the detection.

[0009] In addition, an optional technical solution is that at least one target detection area is set on the PCB to be detected, and each target detection area is detected in a preset order or independently detected simultaneously, and each target detection area corresponds to a detection result respectively.

[0010] In addition, an optional technical solution is that the dispensing detection positions in the target detection area are visually detected according to a preset rule, and the corresponding position detection results are recorded, including:

[0011] Image acquisition and processing are carried out one by one on the dispensing detection positions in the same target detection area through a vision mechanism to obtain the corresponding position detection results;

[0012] The defective dispensing detection positions in the position detection results are accumulated, and when the total accumulated number is greater than the preset threshold, an alarm reminder is given.

[0013] In addition, an optional technical solution is that the dispensing detection positions in the target detection area are visually detected according to a preset rule, and the corresponding position detection results are recorded, including:

[0014] Set a detection template frame;

[0015] Image acquisition and processing are carried out on at least two dispensing detection positions within the detection template frame through a vision mechanism to obtain the corresponding position detection results;

[0016] The defective dispensing detection positions in the position detection results are accumulated, and when the total accumulated number is greater than the preset threshold, an alarm reminder is given.

[0017] In addition, an optional technical solution is that the distance between the edge of the detection template frame and the corresponding edge of the internal dispensing detection position is 1 - 3 mm.

[0018] In addition, an optional technical solution is that the alarm reminder includes a sound reminder, a warning light reminder or an alarm method combining sound and light.

[0019] In addition, an optional technical solution is that after the target detection area passes the detection, it also includes judging the defective type of the defective dispensing detection position;

[0020] Among them, the defective types of the defective dispensing detection positions include incoming material defect defects, missing chip defects and dispensed defects.

[0021] In addition, an optional technical solution is that the judging process of the dispensed defect includes:

[0022] The height of the reference surface of the PCB to be detected is measured by a laser, and the first height value is recorded;

[0023] Measure the height of the defective dispensing detection position by laser and record the second height value;

[0024] Obtain the difference between the second height value and the first height value;

[0025] If the difference is greater than the thickness of the chip within the target detection area, determine that the defective type of the defective dispensing detection position is defective dispensing.

[0026] In addition, an optional technical solution is to mark and perform corresponding recycling processing on the PCB to be detected according to the defective type of the defective dispensing detection position.

[0027] On the other hand, the present invention also provides a product detection system, including:

[0028] A region setting unit for setting a target detection region on the PCB to be detected, and having at least one dispensing detection position within the target detection region;

[0029] A region detection unit for visually detecting the dispensing detection positions within the target detection region according to a preset rule and recording the corresponding position detection results;

[0030] A result determination unit for counting the total number of defective dispensing detection positions in the position detection results and determining the detection result of the target detection region according to the total number of defective dispensing detection positions; wherein,

[0031] When the total number of defective dispensing detection positions is greater than a preset threshold, determine that the target detection region fails the detection and give an alarm reminder; otherwise, determine that the target detection region passes the detection.

[0032] Using the above product detection method and system, set a target detection region on the PCB to be detected, then visually detect the dispensing detection positions within the target detection region respectively according to a preset rule, and record the corresponding position detection results. When the total number of defective dispensing detection positions is greater than a preset threshold, determine that the target detection region fails the detection and give an alarm reminder, which can effectively reduce the number of alarms and avoid the operator from manually closing the alarm process (including clicking the software to stop, entering the anti-secondary operation task, then logging in to the machine adjustment permission, modifying the program detection position, and re-creating and saving the template, and then switching to the main task to run again, etc.), thereby improving the detection efficiency before dispensing and facilitating the subsequent transformation to the mode of a black light factory.

[0033] To achieve the above and related purposes, one or more aspects of the present invention include features that will be described in detail later. The following description and the accompanying drawings illustrate certain exemplary aspects of the present invention in detail. However, these aspects merely indicate some of the various ways in which the principles of the present invention can be used. In addition, the present invention is intended to cover all such aspects and their equivalents. Description of the Drawings

[0034] Other objects and results of the present invention will become more apparent and easier to understand by referring to the following description in conjunction with the accompanying drawings. In the drawings:

[0035] Figure 1 is a flowchart of a product detection method according to an embodiment of the present invention;

[0036] Figure 2 is a logical block diagram of a product detection system according to an embodiment of the present invention.

[0037] In all the drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed Description of the Embodiments

[0038] In the following description, for the purpose of illustration, in order to provide a comprehensive understanding of one or more embodiments, many specific details are set forth. However, it is obvious that these embodiments can also be implemented without these specific details. In other instances, well-known structures and devices are shown in block diagram form for the convenience of describing one or more embodiments.

[0039] Those skilled in the art of the present technology can understand that, unless specifically stated otherwise, the singular forms "a", "an", "the", and "said" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the specification of the present invention means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or their groups. It should be understood that the phrase "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0040] Those skilled in the art of the present technology can understand that, unless otherwise defined, all terms (including material terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the art to which the present invention pertains. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless defined as such herein.

[0041] To describe in detail the product detection method and system within the present invention, the following will describe in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0042] Figure 1 The schematic flow of the product detection method according to an embodiment of the present invention is shown.

[0043] As Figure 1 shown, the product detection method of the embodiment of the present invention is used for pre-dispensing detection of a PCB, and at least includes the following steps:

[0044] S100: Set a target detection area on the PCB to be detected, and there is at least one dispensing detection position within the target detection area.

[0045] Among them, since there can be up to thousands or thousands of components such as chips on the PCB to be detected, and the positions to be dispensed are some of them (i.e., dispensing detection positions), in order to improve the detection efficiency before dispensing, the PCB can be divided into areas according to the area to be dispensed or the distribution of the dispensing detection positions to be detected, that is, set one or more target detection areas, and then in the subsequent detection process, the target detection area can be used as a unit to detect multiple dispensing detection positions therein.

[0046] Specifically, at least one target detection area can be set on the PCB to be detected. Each target detection area can be detected in a preset order or independently at the same time. Each target detection area corresponds to a detection result, and then it can be determined whether to give an alarm according to the detection result. It can be seen that the shape or distribution of the target detection area can be flexibly set according to the structure of the PCB to be detected and the product detection requirements. The shape of this area can be a regular shape or an irregular shape, etc.

[0047] S200: Visually detect the dispensing detection positions within the target detection area according to a preset rule, and record the corresponding position detection results.

[0048] Among them, after determining the target detection area, since there is at least one dispensing detection position within the target detection area, therefore, in the process of visually detecting multiple dispensing detection positions within a target detection area, a certain order can be adopted, such as detecting row by row from left to right, or detecting column by column from top to bottom, etc., to detect each dispensing detection position one by one, or multiple dispensing detection positions can also be detected at the same time.

[0049] Embodiment 1:

[0050] Visually detecting the dispensing detection positions within the target detection area according to a preset rule and recording the corresponding position detection results may include:

[0051] The image acquisition and processing are performed on each dispensing detection position in the same target detection area through a vision mechanism to obtain the corresponding position detection result;

[0052] The defective dispensing detection positions in the position detection results are accumulated. When the total accumulated number is greater than a preset threshold, an alarm reminder is given.

[0053] Specifically, the detection order can start from the upper left corner of the PCB and proceed row by row from top to bottom or column by column from left to right. At this time, the first dispensing detection position (i.e., the dispensing position) of the entire PCB is the first product in the upper left corner of the PCB. Its coordinate information can be recorded, and the products are detected one by one in order.

[0054] Embodiment 2:

[0055] Visual inspection is performed on the dispensing detection positions in the target detection area according to a preset rule, and the corresponding position detection results are recorded, including:

[0056] Set a detection template frame;

[0057] The image acquisition and processing are simultaneously performed on at least two dispensing detection positions within the detection template frame through a vision mechanism to obtain the corresponding position detection result;

[0058] The defective dispensing detection positions in the position detection results are accumulated. When the total accumulated number is greater than a preset threshold, an alarm reminder is given.

[0059] It should be noted that in the above specific embodiments, the vision mechanism may include a light source, a camera, an image processing system, etc.; among them, with the assistance of the light source, the camera can capture the image information of the dispensing detection position, and then through the image processing system, the image is enhanced, optimized, etc. and then compared with the image of a standard or qualified product for similarity analysis, so as to determine the corresponding position detection result.

[0060] Specifically, in this embodiment, a camera with a larger field of view can be selected to simultaneously capture the dispensing detection positions. Furthermore, through one mechanical action beat, the simultaneous detection of multiple products can be completed. Among them, the edge distances of the upper, lower, left, and right of the detection template frame for multiple products are determined to be 1 - 3 mm from the edge of the corresponding dispensing detection position. Preferably, it can be set to 2 mm. The light source brightness can be set to 300 - 400, so that the surface of the dispensing detection position is in an extremely white state; the similarity parameter can be set to not less than 90. The greater the similarity, the higher the matching degree with the detection template frame is required to pass, thereby improving the accuracy of each position detection.

[0061] In addition, when the cumulative total of defective dispensing detection positions is greater than a preset threshold, an alarm reminder is given. It also includes: when the cumulative total of defective dispensing detection positions is greater than the preset threshold, but the dispensing detection positions within the current target detection area have not been fully detected, that is, there are still undetected dispensing detection positions within the target detection area, continue to detect the remaining undetected positions and record the corresponding position detection results. Regardless of the detection results of the remaining undetected positions, an alarm reminder can be given.

[0062] S300: Count the total number of defective dispensing detection positions in the position detection results, and determine the detection result of the target detection area according to the total number of defective dispensing detection positions; among them, when the total number of defective dispensing detection positions is greater than the preset threshold, it is determined that the target detection area fails the detection and an alarm reminder is given; otherwise, it is determined that the target detection area passes the detection.

[0063] Among them, the above alarm reminder can include various alarm methods such as sound reminder, warning light reminder or a combination of sound and light.

[0064] In a specific embodiment of the present invention, after the target detection area passes the detection, the product detection method further includes judging the defective type of the defective dispensing detection position; among them, the defective types of the defective dispensing detection positions include incoming material defect, missing chip, and already dispensed (to avoid repeated dispensing), so as to perform operations such as marking the PCB to be detected and corresponding recycling processing according to the defective types of the defective dispensing detection positions in the subsequent process.

[0065] Among them, the judgment process of already dispensed can include: measuring the height of the reference surface of the PCB to be detected by laser and recording the first height value; measuring the height of the defective dispensing detection position by laser and recording the second height value; obtaining the difference between the second height value and the first height value; if the difference is greater than the thickness of the chip within the target detection area, it is judged that the defective type of the defective dispensing detection position is already dispensed, and such defects can be marked for avoidance of the already dispensed position in the subsequent dispensing process.

[0066] Corresponding to the above product detection method, the present invention also provides a product detection system. Among them, Figure 2 shows the schematic logic of the product detection system according to the embodiment of the present invention.

[0067] As Figure 2 shown, the product detection system of the embodiment of the present invention includes:

[0068] A region setting unit 10 for setting a target detection area on the PCB to be detected, and having at least one dispensing detection position within the target detection area;

[0069] The area detection unit 20 is configured to perform visual detection on the dispensing detection positions within the target detection area according to a preset rule, and record the corresponding position detection results;

[0070] The result determination unit 30 counts the total number of defective dispensing detection positions in the position detection results, and determines the detection result of the target detection area according to the total number of defective dispensing detection positions; wherein,

[0071] When the total number of defective dispensing detection positions is greater than a preset threshold, it is determined that the target detection area fails the detection and an alarm reminder is given; otherwise, it is determined that the target detection area passes the detection.

[0072] It should be noted that for the embodiments of the above product detection system, reference can be made to the description in the embodiments of the product detection method, and details will not be repeated here.

[0073] According to the above product detection method and system of the present invention, it is possible to effectively reduce the number of alarm times before dispensing, save the operator from manually closing the alarm process, improve the detection efficiency before dispensing and the equipment OEE, realize automated detection and actions, reduce manual operations, and facilitate the subsequent transformation to the mode of a dark factory.

[0074] As described above, the product detection method and system according to the present invention are described by way of example with reference to the drawings. However, those skilled in the art should understand that various improvements can be made to the above product detection method and system proposed by the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the appended claims.

Claims

1. A product detection method, characterized in that, For pre - detection before dispensing on a PCB, the method includes: Set a target detection area on the PCB to be detected, and there is at least one dispensing detection position within the target detection area; Visually detect the dispensing detection positions within the target detection area according to a preset rule, and record the corresponding position detection results; Count the total number of defective dispensing detection positions in the position detection results, and determine the detection result of the target detection area according to the total number of defective dispensing detection positions; where When the total number of defective dispensing detection positions is greater than a preset threshold, determine that the target detection area fails the detection and give an alarm reminder; otherwise, determine that the target detection area passes the detection.

2. The product detection method according to claim 1, wherein At least one target detection area is set on the PCB to be detected, and each target detection area is detected in a preset order, or independently detected simultaneously, and each target detection area corresponds to a detection result respectively.

3. The product detection method according to claim 1, characterized in that, The visually detecting the dispensing detection positions within the target detection area according to a preset rule and recording the corresponding position detection results includes: Through a vision mechanism, image acquisition and processing are carried out one by one on the dispensing detection positions within the same target detection area to obtain the corresponding position detection results; Accumulate the defective dispensing detection positions in the position detection results, and when the total accumulated number is greater than the preset threshold, give an alarm reminder.

4. The product detection method according to claim 1, characterized in that, The visually detecting the dispensing detection positions within the target detection area according to a preset rule and recording the corresponding position detection results includes: Set a detection template frame; Through a vision mechanism, image acquisition and processing are carried out on at least two dispensing detection positions within the detection template frame to obtain the corresponding position detection results; Accumulate the defective dispensing detection positions in the position detection results, and when the total accumulated number is greater than the preset threshold, give an alarm reminder.

5. The product detection method according to claim 4, wherein The distance between the edge of the detection template frame and the corresponding edge of the dispensing detection position inside is 1 - 3 mm.

6. The product detection method according to claim 1, characterized in that, The alarm reminder includes a sound reminder, a warning light reminder, or an alarm method combining sound and light.

7. The product detection method according to claim 1, characterized in that, After the target detection area passes the detection, it further includes judging the defective type of the defective dispensing detection positions; Among them, the defective types of the defective dispensing detection positions include incoming material defect, missing chip, and dispensed defect.

8. The product detection method according to claim 7, characterized in that, The judging process of the dispensed defect includes: Measure the height of the reference plane of the PCB to be detected by laser and record the first height value; Measure the height of the defective dispensing detection position by laser and record the second height value; Obtain the difference between the second height value and the first height value; If the difference is greater than the thickness of the chip within the target detection area, judge that the defective type of the defective dispensing detection position is a dispensed defect.

9. The product detection method according to claim 7, wherein Mark the PCB to be detected according to the defective type of the defective dispensing detection positions and perform corresponding recycling processing.

10. A product detection system, characterized in that, Includes: A region setting unit, configured to set a target detection region on a PCB to be detected, and there is at least one dispensing detection position within the target detection region; A region detection unit, configured to perform visual detection on the dispensing detection positions within the target detection region according to a preset rule, and record the corresponding position detection results; A result determination unit, counting the total number of defective dispensing detection positions in the position detection results, and determining the detection result of the target detection region according to the total number of defective dispensing detection positions; wherein, when the total number of defective dispensing detection positions is greater than a preset threshold, it is determined that the target detection region fails the detection and an alarm reminder is given; otherwise, it is determined that the target detection region passes the detection.

Images