A flying probe test probe deviation compensation method, device, equipment and medium

Abstract

The present invention belongs to the technical field of PCB detection equipment, and specifically relates to a flying probe test probe deviation compensation method, device, equipment and medium. The present invention proposes a method for directly calculating the deviation and compensating it through the camera system of a flying probe machine. The method uses the center of the driving end of the probe as the reference point, controls the probe to move along a preset direction until the visual center position coincides with the preset position of the target board, obtains relevant coordinates and distance values ​​through the camera system, calculates and determines the motion compensation value of the probe to be compensated, and finally controls the driving end to move to complete the deviation compensation. The present invention achieves fast and accurate needle tip deviation compensation without the aid of external tools, thereby improving the test efficiency and accuracy of the flying probe machine.

Description

Technical Field

[0001] The invention belongs to the technical field of PCB detection equipment, and in particular relates to a flying probe test probe deviation compensation method, device, equipment and medium. Background Art

[0002] In the field of PCB (Printed Circuit Board) inspection equipment, flying probe machines are a key test equipment, and their accuracy and efficiency are crucial. Existing flying probe machines mostly use the needle mark method and calibration board needle method to compensate for needle tip deviation. The needle mark method relies on pressure paper to leave needle marks and calculate the deviation through a camera, while the calibration board method uses a probe to continuously pierce a fixed-size pad and judge the deviation through electrical signals. Both methods have the problems of cumbersome operation and low efficiency, and cannot meet the modern high-efficiency and high-precision production needs.

[0003] Specifically, the needle mark method requires additional pressure paper and camera shooting steps, which not only increases the cost but also reduces the test efficiency. The calibration plate method requires continuous needle pricking, which is not only time-consuming and labor-intensive, but may also cause unnecessary wear on the probes and pads. In addition, both methods rely on external tools and cannot achieve fast and direct deviation calculation and compensation. Therefore, there is an urgent need in the prior art for a method that can quickly and accurately compensate for needle tip deviation without the aid of external tools, so as to solve the problems of low efficiency and cumbersome operation in the prior art. Summary of the invention

[0004] The purpose of the present invention is to provide a flying probe test probe deviation compensation method, device, equipment and medium, aiming to directly calculate the deviation and compensate it through the flying probe machine camera system, thereby improving the testing efficiency and accuracy of the flying probe machine.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] In a first aspect, the present invention provides a flying probe test probe deviation compensation method, the method comprising:

[0007] Taking the center of the driving end of the probe as a reference point, control the probe to move along a preset first direction and / or a second direction until the visual center position of the probe coincides with the preset position of the target plate; wherein the first direction is a translation direction and the second direction is a rotation direction;

[0008] Obtaining coordinate values ​​of a preset position and a probe position on a target plate, and distance values ​​between the preset position, the probe position and the reference point;

[0009] Determine the probe motion compensation value to be compensated according to the preset position coordinate value, the probe position coordinate value and the distance value; the motion compensation value includes a translation compensation value in a first direction and an angle compensation value in a second direction;

[0010] Controlling the driving end to move in response to the motion compensation value, and completing the deviation compensation when the probe moves to a point where the probe position coincides with the preset position;

[0011] Among them, a theoretical coordinate system is constructed with the plane where the target plate is located as the coordinate plane and the reference point as the coordinate origin, the first direction is used as the horizontal axis direction of the theoretical coordinate system, and the vertical direction of the first direction is used as the vertical axis direction of the theoretical coordinate system.

[0012] Furthermore, before controlling the probe to move along the preset first direction and / or second direction until the visual center position of the probe coincides with the preset position of the target panel, the method further includes:

[0013] In the theoretical coordinate system, the visual center position A and the probe position B of the probe are obtained by the camera system, and the deviation of the probe position B relative to the visual center position A is calculated by the pixels of the camera system, and the deviation includes the deviation along the horizontal axis. and the deviation along the longitudinal axis ;

[0014] In the theoretical coordinate system, the distance L1 from the visual center position A of the probe to the reference point is obtained, and the rotation angle of the second direction in the process of the visual center position A of the probe moving to the preset position on the target plate is obtained. .

[0015] Further, the obtaining of the coordinate values ​​of the preset position and the probe position on the target plate, and the distance value between the preset position, the probe position and the reference point includes:

[0016] Calculate the coordinate value of the preset position on the target plate in the theoretical coordinate system , ;

[0017] Calculate the probe coordinate value in the theoretical coordinate system ,in ;

[0018] Calculate the distance between the visual center position A of the probe and the reference point , .

[0019] Further, the determining the probe motion compensation value to be compensated according to the preset position coordinate value, the coordinate value of the probe position and the distance value includes:

[0020] In the theoretical coordinate system, the probe position B is moved to a preset position on the target plate, and based on a geometric relationship, two congruent triangles formed by the probe position B, the preset position on the target plate and the reference point are constructed in the theoretical coordinate system;

[0021] By constructing an equation through the two congruent triangles, the translation compensation value for compensating the first direction and the angle compensation value for compensating the second direction are calculated, so that the probe moves to a preset position on the target plate. The expression is:

[0022] ;

[0023] in, is the distance between the probe position and the reference point, is the translation compensation value in the first direction, is the angle compensation value of the second direction.

[0024] Furthermore, in the theoretical coordinate system, the probe position B is specifically the tip position of the probe.

[0025] In a second aspect, the present invention proposes a flying probe test probe deviation compensation device, which is used to perform any of the above-mentioned flying probe test probe deviation compensation methods, and the device includes:

[0026] A first control module is used to control the probe to move along a preset first direction and / or a second direction with the center of the driving end of the probe as a reference point until the visual center position of the probe coincides with the preset position of the target plate; wherein the first direction is a translation direction and the second direction is a rotation direction;

[0027] A position acquisition module, used to acquire the coordinate values ​​of the preset position and the probe position on the target plate, and the distance value between the preset position, the probe position and the reference point;

[0028] A compensation value determination module, used to determine the probe motion compensation value to be compensated according to the preset position coordinate value, the probe position coordinate value and the distance value; the motion compensation value includes a translation compensation value in a first direction and an angle compensation value in a second direction;

[0029] The second control module is used to control the driving end to move in response to the motion compensation value, and when the probe moves to the point where the probe position coincides with the preset position, the deviation compensation is completed.

[0030] In a third aspect, the present invention provides an electronic device, comprising:

[0031] A processor; a memory for storing instructions executable by the processor;

[0032] The processor is configured to execute the instructions to implement the flying probe test probe deviation compensation method as described in any one of the above.

[0033] In a fourth aspect, the present invention proposes a computer-readable storage medium. When instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute the flying probe test probe deviation compensation method as described in any one of the above items.

[0034] The beneficial effects of the present invention are:

[0035] The present invention directly calculates the deviation through the built-in camera system of the flying probe machine, which not only simplifies the operation process, but also significantly improves the test efficiency and accuracy. Compared with the traditional needle mark method and calibration plate needle method, the present invention avoids the steps of using pressure paper and repeated needle sticking, thereby reducing costs and reducing the wear on the probe and pad. In addition, the method of the present invention can calculate and compensate for the needle tip deviation in real time and accurately, ensuring the accuracy and reliability of the test results. This method is not only suitable for flying probe machines, but can also be expanded to other test equipment that requires high-precision deviation compensation, and has broad market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of a flow chart of a flying probe test probe deviation compensation method provided in an embodiment of the present application;

[0037] Figure 2 A schematic diagram of a model structure of a flying needle machine in an embodiment of the present application;

[0038] Figure 3 This is a schematic diagram of the actual test of the flying probe machine in the embodiment of the present application;

[0039] Figure 4 Schematic diagram of the motion process of two congruent triangles constructed in an embodiment of the present application.

[0040] Figure 2-4 Among them, 1. Linear guide; 2. Linear motor; 3. Rotary motor; 4. Voice coil motor; 5. Cantilever; 6. Probe; 7. Camera system; 8. Prism; 9. Target board; 10. Pad. DETAILED DESCRIPTION

[0041] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0042] Example 1

[0043] like Figure 1 As shown, this embodiment proposes a flying probe test probe deviation compensation method, which is suitable for Figure 2 In the flying needle machine model shown, the mover of the linear motor 2 in the model can move horizontally on the linear guide 1, the rotary motor 3 is installed on the linear motor 1, and can move horizontally with the linear motor 1, the stator of the voice coil motor 4, the camera system 7, and the prism 8 are installed as a whole on the mover of the rotary motor 3 and can rotate in the horizontal plane, and the cantilever 5 and the probe 6 are installed as a whole on the mover of the voice coil motor 4 and can perform reciprocating needle-piercing motion in the vertical direction.

[0044] Combination Figure 3 The actual test of the flying needle machine is to control the linear motor 2 to move x distance from the zero position, control the rotary motor 3 to rotate θ angle from the horizontal position, and let the needle tip move to the center of the pad 10 for needle testing. Theoretically, it is hoped that the center of the camera's field of view and the needle tip coincide, so that after the camera center is aligned, the actual needle tip is also at the position of the pad. In fact, due to the existence of machining errors, each batch of needles is different. After replacing a new needle, the needle tip is not in the center of the camera's field of view, so this deviation needs to be compensated.

[0045] Based on the above flying probe machine model, this embodiment proposes a method for quickly and accurately compensating for needle tip deviation without the aid of external tools. The method comprises the following steps:

[0046] S1, taking the center of the driving end of the probe as a reference point, controlling the probe to move along a preset first direction and / or a second direction until the visual center position of the probe coincides with a preset position of a target board (in this embodiment, both refer to the pad 10 on the PCB board); wherein the first direction is a translation direction, and the second direction is a rotation direction;

[0047] Further preferably, before controlling the probe to move along a preset first direction and / or second direction until the visual center position of the probe coincides with a preset position of the target panel, the method includes: constructing a theoretical coordinate system with the plane where the target panel is located as a coordinate plane and the reference point as a coordinate origin, using the first direction as the horizontal axis direction of the theoretical coordinate system, and using the vertical direction of the first direction as the vertical axis direction of the theoretical coordinate system.

[0048] More specifically, in the specific implementation, the driving end of the probe includes a linear motor 2 and a rotary motor 3, which are used to control the translation or rotation of the probe. In addition, the visual center position of the probe is obtained based on the camera system in the above-mentioned flying needle machine model, and the preset position of the target board 9 is specifically the pad 10 on the PCB board; that is, the implementation scenario is that the driving end drives the needle tip of the probe to perform a needle test on the pad 10 on the PCB board.

[0049] Further preferably, before controlling the probe to move along the preset first direction and / or second direction until the visual center position of the probe coincides with the preset position of the target plate, the method further comprises:

[0050] In the theoretical coordinate system, the visual center position A and the probe position B of the probe are obtained through the camera system, and the deviation of the probe position B relative to the visual center position A is calculated through the pixels of the camera system. The deviation includes the deviation along the horizontal axis. and the deviation along the longitudinal axis ;

[0051] In the theoretical coordinate system, obtain the distance L1 from the visual center position A of the probe to the reference point, and obtain the rotation angle of the second direction during the process of the visual center position A of the probe moving to the preset position on the target plate. ( The rotation angle of the rotating motor can be obtained through encoder feedback).

[0052] It can be understood that in this embodiment, the visual center position A and the probe position B of the probe, the deviation of the probe position B relative to the visual center position A, and the distance from the visual center position A of the probe to the reference point are , and obtaining the rotation angle of the second direction during the process of moving the visual center position A of the probe to the preset position on the target plate All of these can be obtained through the camera system in the above-mentioned flying probe machine model. The deviation can be calculated through the camera system without the help of tools.

[0053] S2, obtaining coordinate values ​​of a preset position and a probe position on a target plate, and distance values ​​between the preset position, the probe position and a reference point;

[0054] Further preferably, obtaining the coordinate values ​​of the preset position and the probe position on the target plate, and the distance value between the preset position, the probe position and the reference point includes:

[0055] Calculate the coordinate values ​​of the preset position on the target plate in the theoretical coordinate system , ;

[0056] Calculate the probe coordinates in the theoretical coordinate system ,in ;

[0057] Calculate the distance between the probe's visual center position A and the reference point , .

[0058] S3, determining the motion compensation value of the probe to be compensated according to the preset position coordinate value, the coordinate value of the probe position and the distance value; the motion compensation value includes a translation compensation value in a first direction and an angle compensation value in a second direction;

[0059] Further preferably, determining the probe motion compensation value to be compensated according to the preset position coordinate value, the coordinate value of the probe position and the distance value includes:

[0060] Combination Figure 4 , in the theoretical coordinate system, the probe position B is moved to the preset position on the target plate, and based on the geometric relationship, two congruent triangles formed by the probe position B, the preset position on the target plate and the reference point are constructed in the theoretical coordinate system;

[0061] By constructing an equation through two congruent triangles, the translation compensation value for compensating the first direction and the angle compensation value for compensating the second direction are calculated, so that the probe moves to the preset position on the target plate. The expression is:

[0062] ;

[0063] in, is the distance between the probe position and the reference point, is the translation compensation value in the first direction, is the angle compensation value of the second direction.

[0064] S4. Control the driving end to move in response to the motion compensation value. When the probe moves to a point where the probe position coincides with the preset position, the deviation compensation is completed.

[0065] It should be noted that, in the theoretical coordinate system, the probe position B in this embodiment is specifically the tip position of the probe.

[0066] According to the above embodiment, the probe deviation compensation method proposed in the present application includes the following steps when implemented:

[0067] (1) Constructing a theoretical coordinate system

[0068] The plane where the target plate 9 is located is used as the coordinate plane, and the center of the driving end of the probe (such as the rotation center of the rotary motor) is used as the coordinate origin to construct a theoretical coordinate system. The motion direction of the linear motor is used as the horizontal axis direction of the theoretical coordinate system, and the vertical direction of the horizontal axis direction is used as the vertical axis direction of the theoretical coordinate system.

[0069] (2) Obtaining probe location information

[0070] The visual center position A and the probe position B (specifically the needle tip position) of the probe are obtained through the camera system 7. The deviation of the probe position B relative to the visual center position A is calculated using the pixels of the camera system, including the deviation along the horizontal axis and the deviation along the vertical axis. At the same time, the distance L1 from the visual center position A of the probe to the reference point (i.e., the origin of the coordinates) is obtained, as well as the rotation angle of the rotating motor during the process of the visual center position A of the probe moving to the preset position on the target board (such as the center of the pad 10).

[0071] (3) Calculate compensation value

[0072] The linear motor and the rotary motor are controlled to move the probe along the preset first direction (translation direction) and / or the second direction (rotation direction) until the visual center position of the probe coincides with the preset position of the target plate. In this process, the coordinate values ​​of the preset position and the probe position on the target plate, as well as the distance values ​​between the preset position, the probe position and the reference point are obtained.

[0073] Specifically, calculate the coordinate value of the preset position on the target plate in the theoretical coordinate system , calculate the probe coordinates in the theoretical coordinate system , and calculate the distance between the probe's visual center position A and the reference point .

[0074] Then, in the theoretical coordinate system, the probe position B (tip position) is moved to the preset position on the target plate, and based on the geometric relationship, two congruent triangles formed by the probe position B, the preset position on the target plate and the reference point are constructed. The equation is constructed by the two congruent triangles to calculate the translation compensation value for the first direction. and the angle compensation value of the second direction , so that the probe moves to the preset position on the target plate. The expression is:

[0075] ;

[0076] in, is the distance between the probe position and the reference point, is the translation compensation value in the first direction, is the angle compensation value of the second direction.

[0077] (4) Apply compensation value

[0078] In response to the calculated motion compensation value and , control the driving end (linear motor and rotary motor) to move, and when the probe moves to the point where the probe position coincides with the preset position, the deviation compensation is completed.

[0079] In another embodiment of the present invention, a flying probe test probe deviation compensation device is provided, which is used to perform the above-mentioned flying probe test probe deviation compensation method, and the device includes:

[0080] A first control module is used to control the probe to move along a preset first direction and / or a second direction with the center of the driving end of the probe as a reference point until the visual center position of the probe coincides with the preset position of the target plate; wherein the first direction is a translation direction and the second direction is a rotation direction;

[0081] A position acquisition module is used to acquire the coordinate values ​​of the preset position and the probe position on the target plate, and the distance value between the preset position, the probe position and the reference point;

[0082] A compensation value determination module, used to determine the motion compensation value of the probe to be compensated according to the preset position coordinate value, the coordinate value of the probe position and the distance value; the motion compensation value includes a translation compensation value in a first direction and an angle compensation value in a second direction;

[0083] The second control module is used to control the driving end to move in response to the motion compensation value, and when the probe moves to a point where the probe position coincides with the preset position, the deviation compensation is completed.

[0084] It should be noted here that each module in the above-mentioned probe deviation compensation device corresponds to steps S1 to S4 in implementing the above-mentioned probe deviation compensation method, and the instances and application scenarios implemented by multiple modules and corresponding steps are the same, but are not limited to the contents disclosed in the above-mentioned embodiment 1.

[0085] Based on the compensation method and device proposed above, compared with the prior art, the present invention has the following technical advantages:

[0086] (1) Without the need for external tools, the flying probe machine camera system can directly calculate the deviation and compensate for it, thus improving the testing efficiency and accuracy of the flying probe machine.

[0087] (2) The method steps are clear and easy to implement and operate, which reduces labor costs and time costs.

[0088] (3) The device has a simple structure, is easy to manufacture and maintain, and is suitable for various types of flying needle machines.

[0089] In another embodiment of the present invention, an electronic device is provided, including:

[0090] a processor; a memory for storing instructions executable by the processor;

[0091] The processor is configured to execute instructions to implement the flying probe test probe deviation compensation method as described above.

[0092] In another embodiment of the present invention, a computer-readable storage medium is provided. When instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device can execute the flying probe test probe deviation compensation method as described above.

[0093] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0094] In addition, each functional module in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0095] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A flying probe test probe deviation compensation method, characterized in that: The method comprises: Taking the center of the driving end of the probe as a reference point, control the probe to move along a preset first direction and / or a second direction until the visual center position of the probe coincides with the preset position of the target plate; wherein the first direction is a translation direction, and the second direction is a rotation direction; taking the plane where the target plate is located as a coordinate plane, taking the reference point as a coordinate origin, constructing a theoretical coordinate system, taking the first direction as the horizontal axis direction of the theoretical coordinate system, and taking the vertical direction of the first direction as the vertical axis direction of the theoretical coordinate system; Get the coordinate value of the preset position on the target board , the coordinate value of the probe position , and the distance value between the preset position, the probe position and the reference point; The motion compensation value of the probe to be compensated is determined according to the preset position coordinate value, the coordinate value of the probe position and the distance value, wherein the motion compensation value includes a translation compensation value in a first direction and an angle compensation value in a second direction, specifically including: In the theoretical coordinate system, the probe position is moved to a preset position on the target plate, and based on a geometric relationship, two congruent triangles formed by the probe position, the preset position on the target plate and the reference point are constructed in the theoretical coordinate system; By constructing an equation through the two congruent triangles, the translation compensation value for compensating the first direction and the angle compensation value for compensating the second direction are calculated, so that the probe moves to a preset position on the target plate. The expression is: ； Wherein, L is the distance between the probe position and the reference point, is the translation compensation value in the first direction, is the angle compensation value of the second direction; The driving end is controlled to move in response to the motion compensation value, and when the probe moves to a point where the probe position coincides with the preset position, the deviation compensation is completed.

2. A flying probe test probe deviation compensation method according to claim 1, characterized in that: Before controlling the probe to move along the preset first direction and / or second direction until the visual center position of the probe coincides with the preset position of the target panel, the method further includes: In the theoretical coordinate system, the visual center position A and the probe position B of the probe are obtained by the camera system, and the deviation of the probe position B relative to the visual center position A is calculated by the pixels of the camera system, and the deviation includes the deviation along the horizontal axis. and the deviation along the longitudinal axis ; In the theoretical coordinate system, the distance L1 from the visual center position A of the probe to the reference point is obtained, and the rotation angle of the second direction in the process of the visual center position A of the probe moving to the preset position on the target plate is obtained. .

3. A flying probe test probe deviation compensation method according to claim 2, characterized in that: The step of obtaining the coordinate values ​​of the preset position and the probe position on the target plate, and the distance value between the preset position, the probe position and the reference point includes: Calculate the coordinate value of the preset position on the target plate in the theoretical coordinate system , ; Calculate the probe coordinate value in the theoretical coordinate system ,in ; Calculate the distance between the visual center position A of the probe and the reference point .

4. A flying probe test probe deviation compensation method according to claim 2, characterized in that: In the theoretical coordinate system, the probe position B is specifically the tip position of the probe.

5. A flying probe test probe deviation compensation device, used to perform the flying probe test probe deviation compensation method according to any one of claims 1 to 4, characterized in that: The device includes: A first control module is used to control the probe to move along a preset first direction and / or a second direction with the center of the driving end of the probe as a reference point until the visual center position of the probe coincides with the preset position of the target plate; wherein the first direction is a translation direction and the second direction is a rotation direction; A position acquisition module, used to acquire the coordinate values ​​of the preset position and the probe position on the target plate, and the distance value between the preset position, the probe position and the reference point; A compensation value determination module, used to determine the probe motion compensation value to be compensated according to the preset position coordinate value, the probe position coordinate value and the distance value; the motion compensation value includes a translation compensation value in a first direction and an angle compensation value in a second direction; The second control module is used to control the driving end to move in response to the motion compensation value, and when the probe moves to the point where the probe position coincides with the preset position, the deviation compensation is completed.

6. An electronic device, characterized in that: include: processor; a memory for storing instructions executable by the processor; The processor is configured to execute the instructions to implement the flying probe test probe deviation compensation method according to any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that: When the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute the flying probe test probe deviation compensation method according to any one of claims 1 to 4.

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