TW416006B - Photoelectric tester and method for a printed circuit board - Google Patents

Abstract

The invention relates to a photoelectric testing system and method for a printed circuit board (PCB), which comprises the image sensor, the image controller, hole set analyzer and hole position detector. The tester is applied with high speed, high precision photoelectric image sensing and control equipment capable of automatically receiving and processing the codes of image signals, ensuring to significantly increase the efficiency of testing operation and to secure the precision for the image data of PCB hole positions. In addition, the photoelectric testing method of the invention provides the automatic testing procedures to compare the hole positions on the reference board and board to be tested such that the inspection with human eyes can be replaced. The hole position tester provides a man-machine interface along with menu selection and event driven methods to input the conditions and ranges configured for the board to be tested and display the resulting configuration as well as the testing result and statistical information regarding the board to be tested. The displayed information can be shown in forms of color graphics and numeric values to provide the effect of easy operation and contrast adjustment.

Description

416006 Five 'Description of the Invention (i) Field of the Invention The present invention relates to the inspection of a printed circuit board (PCB). In particular, it is related to an automated photoelectronic detection system and method for printed circuit boards. BACKGROUND OF THE INVENTION It is generally referred to as the to-be-compared comparison, which is generally based on the diameter (h ο 1 e comparison, and is larger than the hole deviation is considered uneven) The traditional board is used as a motor-by-hole motor technology belt, etc. However, the speed and board photodetection of the printed circuit board are based on the printed circuit board to be tested (the test board) and a standard printed circuit board (hereinafter referred to as the short board) (Reference plate). The board under test is detected as a defective board, and the hole position (h oie coordinate) and the hole diameter of the board under test are used to match the hole position of the reference board. The hole-by-hole and hole-by-hole reference conditions and categories of the reference plate are used as reference references. If the valley tolerance (of f grid tolerance) or its defect tolerance is good, it is a good plate. The artificial inspection method for adjusting the conditions and scope of the reference plate according to need is to compare the test plate with the plastic mold of the reference plate. Not only the work efficiency is poor, but it is difficult to ensure accuracy. With the evolution, although there is an automated printed circuit board inspection system, including moving test boards and color display results on the monitor screen, there is still no set of high-precision, high-automation, and humanization for the users of the system And easy-to-operate printed circuit test system.

A: \ inspectl224. Ptd Page 4 416006 V. Description of the invention (2) Summary of the invention The present invention overcomes the shortcomings of the above-mentioned printed circuit board hole position and hole deviation detection system. One of the objectives is to provide a printed circuit board inspection system. The system is an automated photoelectric inspection system and is provided with a humanized, easy-to-operate human-machine interface. By using this man-machine interface, set the inspection conditions and outline of the reference board ’, and through this man-machine interface, display the test results and statistical data of the board to be tested in real time. Another object of the present invention is to provide a printed circuit board detection system ', and the detection system uses automatic image acquisition, high-speed, high-precision photoelectric image sensing and control equipment to receive and process image signal encoding . The use of high-speed, high-precision automated equipment can greatly improve the efficiency of inspection operations, and can also ensure the accuracy of the original hole image data of the printed circuit board. Therefore, under the set conditions and categories to be inspected, group hole analysis and hole position detection 'can accurately detect the defective plate at high speed. According to the present invention, the elements of the set of hole analysis or hole detection can use a central processing unit and a memory unit to implement functions and serve as required data storage space 'to eliminate the high cost of purchasing special equipment. The component for detecting the hole position according to the present invention is provided with a human-machine interface for inputting

416006 V. Description of the invention (3) Enter the inspection conditions and scope of the reference plate, and display the setting result of the reference plate and the test results and statistical data of the plate to be tested. Another object of the present invention is to provide the above-mentioned automatic detection method for a printed circuit board photoelectric detection system, which includes a step of setting a reference board, an automatic detection program for comparing hole positions between the reference board and the board to be tested, and a human-machine interface. Approach. The automatic photoelectric detection method of the present invention replaces the traditional artificial visual inspection method and provides a number of novel detection functions, which greatly improves the detection accuracy and operation efficiency. According to the system and method for testing a printed circuit board of the present invention, the information displayed in the test results includes the number of flaws around the holes, the number of missing holes, the positions of the missing holes and the pore diameter, the number of the holes, the positions of the porous holes and the pore diameter, and the plug f size) number, hole plug hole position and hole diameter 'and the hole position and hole size of the reference plate and the board under test, and statistical information of the number of good plates and defective plates. β In the printed circuit board inspection system of the present invention In an embodiment, by using generally suitable input and output components, in a human-computer interactive manner, the settings of the reference board are input and displayed, and the test results and statistical information of the board under test are displayed in color graphics and numerical values. To display, to provide easy-to-operate and contrast adjustment effects. The above and other objects and advantages of the present invention are described in detail below in conjunction with the following drawings, detailed description of the embodiments, and the scope of patent applications.

A: \ inspectI224.ptd Page 6 416006 V. Description of the invention (4) " '~' ---- Explanation between drawings Figure 1 is a block diagram of the printed circuit board inspection system of the present invention. FIG. 2 is a schematic structural diagram of capturing an image of a hole position on a printed circuit board by an image sensing unit of the printed circuit board detection system of the present invention. Fig. 3 is a diagram showing the structure of an image control unit of the printed circuit board inspection system of the present invention. FIG. 4 is a schematic diagram of a group hole analysis unit of the printed circuit board inspection system of the present invention. FIG. 5 is a schematic diagram of the structure of a hole position detecting unit of the printed circuit board detection system of the present invention. 'FIG. 6 is an operation flowchart of the inspection printed circuit board of the present invention. FIG. 7 illustrates steps and processes of setting a reference plate in FIG. 6. Fig. 8 illustrates an embodiment of the present invention for setting a reference plate through the man-machine interface 'in the hole detection unit in Fig. 5. ;

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Figure 9 is the operating flow of Figure 6. In the sequence of testing shoes, the hole numbers of the reference board and the board to be tested are illustrated. 01 01 shirt image sensor unit 102 image control unit 103 group hole analysis unit 104 hole position detection unit 105 human machine interface CLK pixel pulse signal SP Line synchronization signal SIG hole position image signal ACT start sensing signal 2 0 1 DUT or reference board 2 0 2 Carousel of drive motor 301 drive circuit 302 encoding circuit 303 storage unit 3 0 4 encoded information

416006 V. Description of the invention (6) 4 0 3 Hole position and aperture information 401, 501 Central processing unit 402, 5 02 Recording unit Detailed description of the invention Fig. 1 is a schematic block diagram of a printed circuit board photoelectric detection system of the present invention. The printed circuit board detection system includes an image sensing unit 01, an image control unit 10, a set of hole analysis units 103, and a hole position detection unit 104. As shown in FIG. 1, the hole detection unit 104 has a man-machine interface 105. The user of the printed circuit board detection system of the present invention sets the inspection conditions and specifications of the reference board through the man-machine interface 105 '. Through the hole detection unit 104, the start sensing signal ACΐ is sent to the image control unit 丨 〇2, and the image control unit 102 drives the image sensing unit 丨 〇1 ^ image sensing unit 1 0 1 senses and captures After a hole image is printed on a printed circuit board, the hole image signal is sent. The image control unit 102 receives the image signals of the holes and processes the encoding of the image signals. The group hole analysis unit 丨 03 receives the code from the image control unit 102 and performs group hole analysis on the code to generate hole position and hole diameter information. The hole position detection unit 104 receives the generated hole position and the hole diameter m ′ as the reference plate settings, and performs the test of the board to be tested. The test results and statistical data of the board to be tested are passed through this man-machine interface 1 0 5 H Yuan Zhen.

A: \ inspectl224. Ptd Page 9 416006 V. Description of the invention (7) The human-machine interface can use generally suitable wheel input and output components, such as keyboard, monitor display (CRT), etc. The display screen can also display the data to be displayed in color graphics and numerical values to provide easy operation and contrast adjustment effects. ’Next, the operation and functional structure of the main units 1101 to 104 of the printed circuit board inspection system of the present invention will be described in detail. Fig. 2 illustrates how the image sensing unit 101 of the present invention can manipulate images of holes on a printed circuit board. As shown in Figure 2, the 'image control unit 丨 〇2 sends a driving signal' pixel pulse signal CLK and line synchronization signal SP to drive the image sensing unit 101 ′ through the conveyor belt 202 of the drive motor, the board under test or The reference plate 2 01 moves forward, and the image sensor unit 102 senses and captures the image of the hole on the board under test or the reference plate, and sends out the image signal s 丨 G of the hole. 'The image control unit 1 0 2 to receive β image control unit 丨 〇2 is a sensing device that converts optical signals into current and voltage signals. Generally suitable optical image sensing devices can be used, including a contact image sensor (CIS) and charging. Charge coupled device (CCD), etc. «FIG. 3 is a schematic structural diagram of an image control unit of the present invention. The image control unit 102 includes a driving circuit 301, an encoding circuit 302, and a storage unit 303. After receiving the start sensing signal ACT, the image control unit 102 issues a driving signal and includes a pixel pulse signal ακ and a line.

Page 10 A: \ inspectl224.ptd 416006 Five 'invention description (8) " Sync signal SP to drive the image sensing unit 101. After the encoding circuit 302 of the image control unit 102 receives the hole image signal SIG from the image sensing unit 101, it sends the hole image signal SI (J code, the encoded information is sent, and the storage unit 303 stores it, and Send to the group hole analysis unit 103. This coding technology can use common coding techniques, such as length coding. Figure 4 is a schematic diagram of the structure of the group hole analysis unit of the present invention. As mentioned before, The group hole analysis unit 1 03 can use a central processing unit and a memory unit το to implement its functions and as a required data storage space, in addition to the high cost of purchasing special equipment. As shown in Figure 4 group hole analysis unit 103 includes a central processing unit 401 and a memory unit 402. After the central processing unit 401 receives the encoded information from the image control unit 102, it performs grouping of the encoded information ^ to generate hole position and aperture information. 403 ^ and send it to the memory unit 402 for storage, and at the same time, the hole position and the aperture information 403 are also sent to the hole position detection unit 104. Figure 5 shows the result of the hole position detection unit of the present invention. Schematic diagram of hole position detection unit 1 (H prepared organic interface 105), and includes-a central processing unit and a memory body danfan 502. As mentioned above, the user of the photoelectric detection system of the present invention uses This man-machine interface 105 is used to set the inspection conditions and scope of the reference plate. Through the central processing unit 501 of the hole position detection unit 104,

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The start sensing signal ACT is sent to the image control unit 102. In addition, the 'central processing unit 501 also receives 104-bit and aperture information from the group hole analysis unit, and executes the test program of the test board and another program of the reference board. A Jiyi body unit 502 is used to store the hole position and aperture information received by the central processing unit, and it is required for the hole position detection unit to execute the test program of the board to be tested and the setting program of the reference board. Data, the following will successively explain the operation flow of the photoelectric detection system of the present invention and the rules of hole location comparison of the detection procedure ^ Moreover, through a human-machine interface 105, a comparative method of human-machine interaction will be used to set a comparison of the reference board A preferred embodiment, and a preferred embodiment of the test results and statistical information of the board under test,

For further description D FIG. 6 is a flow chart of the operation of the printed circuit board photoelectric detection system of the present invention. First, use the human-machine interface 105 to set a reference board and its inspection conditions and scope (step 601). Scanning and sensing the board to be tested 'via the image sensing unit 102 to capture the drilling image information of the board to be tested (step 602). After the drilling image information is obtained, the drilling image information is further encoded and analyzed, and the hole position and aperture information of the board to be tested are obtained (step 603). Based on the setting conditions and scopes of the reference board to be inspected, the test program of the board to be tested is performed (step 604). Finally, through the human-machine interface 105, the test board and the test results of the board under test are displayed as good and defective products and statistical data.

A: \ inspectl224. Ptd Page 12 416006 V. Description of the invention (10) Classification (step 60 5). In this way, the test of a printed circuit under test is completed. Go back to step 6 2 'Follow the procedure described above' to inspect the next printed circuit board. FIG. 7 illustrates steps and processes of setting a reference plate in FIG. 6. As shown in Figure 7, the steps of setting the reference board can be based on the choice of the input method (step 70a), and includes the following steps: Method 1: (step 701) select a standard printed circuit board as the reference board. (Step 702) Scan and sense the reference plate to retrieve the drilling image information of the reference plate; (Step 703) Code and group hole analysis of the money hole image information. (Step 704) Obtain the reference plate Hole position and aperture information; (Step 705) Set the conditions and scope of the reference plate to be inspected, and (Step 706) Store the hole position, hole diameter, and setting information of the reference plate. The input method of steps 701 to 703 in method 1 is replaced by reading the drilling file (step 70b), which becomes the input method of method 2. Figure 8 is a menu-driven event (menu 〇perated event) through the human-machine interface m, according to the steps of setting the reference board in Figure 7.

A: \ inspectl224_ptd Page 13 V. Description of the invention (11) A preferred embodiment of the dhve㈦ method to set a reference plate. According to the present invention, in the inspection procedure of the hole position and the basis of the test board, The step of the "hole position comparison of the detection standard plate" and the hole procedure of the β reference plate and the plate to be tested is the same as that shown in Fig. 9 for the operation flow level comparison. Referring to the rule of hole position comparison in FIG. 9, in step 901, the corresponding reference hole on the board under test is found based on the hole position and aperture information. Then, in step 902, the board under test is translated and rotated. Align the reference hole with the reference hole of the lifting plate. Before the hole positions of the two plates are compared, the covering hole and the holes located in the covering area and the covering diameter are excluded in step 9 (^). Then, the two plates are compared hole by hole (step 904). Following It is an implementation example of the determination rule of hole-by-hole comparison. If the hole in the reference plate does not exist in the board to be tested, it is determined as a missing hole. If the hole that does not exist in the reference board exists in the board to be tested If the pores of the two plates are within the pore deviation tolerance, and the pore diameters belong to different pore diameter ranges, then it is determined as a hole plug. If the pores of the two plates are greater than the pore deviation tolerance, and Holes that belong to the same pore size range are judged to be misaligned. When the holes are misaligned, the holes in the reference plate are judged to be missing. And the holes in the board to be tested are judged to be porous. The defect board is determined by the user's tolerance for defects, and the parameters that determine the tolerance of the defect include the holes in the board to be tested.

A: \ inspectl224. Ptd Page 14 416006 V. Description of the invention (12) Number, number of holes and number of plugs. If the number of holes, holes, and plugs in the board under test is greater than the tolerance for defects, the board under test is judged to be a defective board, otherwise the board under test is judged to be a good board. FIG. 10 is a preferred embodiment of displaying test results and statistical information of a board to be tested through a human-machine interface 105 ′. The screen of the human-machine interface 105 is displayed with color graphics and numerical values to provide easy operation and contrast adjustment effects. In the embodiment shown in FIG. 10, the information displayed by the test results includes the number of flaws around the hole, the number of missing holes, the position of the missing hole and the pore diameter, the number of holes and the pore diameter, the number of plugs, the number of plug holes, and Aperture, its reference plate: the plate's hole position and hole size 'and the statistical data of the number of good and defective plates fL. It goes without saying that the preferred embodiment of the present invention is only limited by the scope of the present invention. That is, within the scope of application of the present invention. Temple changes and modifications ’should still be covered by the invention patent. Page 15 A: \ inspectl224. Ptd

Claims (1)

Six 'application profile ss " ~ — 1' — a photoelectric detection system for printed circuit boards, including: ~ image sensing unit for sensing and capturing images of holes on a printed circuit board; an image control unit For driving the image sensing unit and receiving the hole image signal from the image sensing unit and processing the code of the image signal; a set of hole analysis units for receiving the code from the image control unit and Code for group hole analysis; and, the hole position detection unit is provided with a man-machine interface 'the hole position detection unit f receives hole position and hole diameter information generated by the group hole analysis as a reference plate setting, and Detection of the test board; 'The user of the detection system sets the test conditions and scope of the reference board through the man-machine interface, and through the man-machine interface, can display the test results and statistical data of the test board . 、 /, 2. The photoelectric inspection system of the printed circuit board described in item 丨 of the scope of application for patent, wherein the image control unit further includes: ,, a driving circuit for generating a signal driving the image sensing unit; One. The encoding circuit is used to receive the hole position multi-image signal from the image sensing unit and encode the hole position image signal; and, ~ a storage unit is used to store the encoding information of the hole position image signal. 3. The photoelectric detection system of a printed circuit board according to item 2 of the scope of patent application, wherein the driving signal includes a pixel pulse signal and a line synchronization signal. _______… $ Please patent scope Squid. First, •,. '·. \' _ · 4 · ^ As described in the first patent application scope of the printed circuit board photoelectric detection system, \ Xianbu This set of hole analysis units includes: ~ Central processing unit, used It is used to receive bats from the image control unit, and perform group hole analysis on the code and generate hole position and aperture information; and a memory unit for storing the hole position and aperture information. • The photoelectric detection system of the printed circuit board described in item 1 of the scope of patent application, where the hole position detection unit includes: a central processing unit for receiving hole position and aperture information from the group of hole analysis units And execute the test program of the board to be tested and the setting program of the reference board; and ~ the memory unit is used to store the hole positions received by the central processing unit. The aperture information is used as the data storage space required when the hole position detection unit executes the setting procedure of the reference plate for the board under test. ^ The photoelectric detection system of the printed circuit board described in item 5 of the patent scope, the man-machine bread contains: and an input unit for setting the inspection conditions and scope of the reference board; It is used to display the setting results of the reference board and the speculative results and statistical data of the board under test. A: \ inspectl224. Ptd Page 17 416006 VI. Scope of patent application ϋ ‘Please use the photoelectric detection system of printed circuit board described in item 1 of the patent scope. The image sensing unit is a device that converts optical signals into current and voltage signals. 8. A photoelectric detection method for a printed circuit board, the method comprising the following steps: setting the inspection conditions and scope of a reference board; scanning and sensing the board to be tested to retrieve drilling image information of the board to be tested; encoding And analyze the drilling image information 'to capture the hole position and aperture information of the board to be tested; use the set test conditions and scope of the reference board as a reference basis to perform the test procedure of the board to be tested; and, display the Test results and statistical data of the board under test, and classify the board under test as good and defective. 9 · Photoelectric detection method of printed circuit board as described in item 8 of the scope of patent application 'The step of setting the reference board' further includes the following steps · Select a printed circuit board as the reference board; Scan and sense the reference Plate to capture the drilling image information of the reference plate; 'code and group holes to analyze the drilling image information and obtain the hole position and aperture information of the reference plate; set the inspection conditions and Fan Ming of the reference plate; and , A: \ inspectl224. Ptd Page 18 416006 ——--------- Six 'Patent Application Range " --- Store the hole position, hole diameter and setting information of the reference plate. For example, as described in item 8 of the patent application, the light of the printed circuit board 1 is used to determine the conditions and scope of the reference board. The step-in method is a human-machine interface. ‘The light 1 = method of the printed circuit board as described in item 8 of the scope of the patent application, wherein the detection result is displayed in an event-driven manner based on an early operation of a human-machine interface. 1 2. According to the light method of the printed circuit board described in Item 8 of the scope of the patent application, the coding and analysis of the drilling image information are section code and group hole analysis. 13. The phosgene method for a printed circuit board as described in item 8 of the scope of patent application, wherein the step of the detection procedure is to compare the hole positions of the holes of the test board with those of the reference board. 14. The light method for a printed circuit board as described in Item 10 of the scope of patent application, wherein the processing method of the man-machine interface includes the following steps to set the inspection conditions and fan nozzles of the reference hole position of the reference board; An input method of the reference plate; setting a scanning speed of the reference plate; and setting hole tolerance and defect tolerance of the reference plate. t detection step, which: the choice of detection surface ί detection length code t detection bit and the electrical detection A: \ inspectl224. Ptd page 19 416006 6. Application for patent scope 15. The photoelectric detection method of printed circuit board as described in item 14 of the scope of application for patent, wherein the reference hole position of the reference board shall be inspected under conditions and scope including There are set reference hole, cover hole, cover area, cover diameter and tool aperture range β 16. Photoelectric detection method of printed circuit board as described in item 13 of the scope of patent application ', wherein the detection of the hole position comparison includes the following Steps · Find the reference hole for detecting the board from the hole position and aperture information of the board to be tested; calibrate the reference hole of the board to be tested with the reference hole of the reference board; exclude the covering hole and locate in the coverage area And cover the holes in the diameter range, and then compare the two plates hole by hole; and, if the holes in the reference plate do not exist in the test board, it is determined as a hole; if the reference plate does not exist, If the holes in the board to be tested exist, it is judged to be porous; ~ If the holes of the two plates are within the tolerance of the holes, and the pores belong to different pore diameter ranges, they are determined to be plugs; Hole position is greater than hole deviation Tolerance, and pores with the same pore size range are judged as hole deviation; when the holes are deviation, holes on the reference plate are judged as missing holes, while holes on the test board are judged as porous. , A: \ inspectl224. Ptd Page 20 416006 6. Scope of patent application 17. The photoelectric detection method of printed circuit board as described in item 14 of the scope of patent application, in which the setting method is set by means of graphics and symbols. 18. The photoelectric detection method of a printed circuit board according to item 14 of the scope of patent application ', wherein the setting method is set by a numerical method. 19. The photoelectric detection method for a printed circuit board according to item 11 of the scope of patent application, wherein the display mode is processed by icons and numerical values. 2 0. Photoelectric detection method for printed circuit board as described in item 19 of the scope of patent application 'wherein' the information displayed in the test result includes the number of defects around the hole, the number of holes, the position and diameter of the hole, and the Statistics, number of porous holes and pores, number of plugs, number of holes and pores, number of holes and pore sizes of the reference plate and the plate to be tested, and the number of good and defective plates 21 · According to the photoelectric detection method of printed circuit board described in item 16 of the scope of the application for patent, where 'if' the lack of holes in the board under test 'and the number of holes and plug holes are greater than the tolerance of flaw f The board is pure, otherwise it is determined that it is to be tested