A camera module testing system

Abstract

This application discloses a camera module testing system, including a light source, a testing unit, a first mounting unit for supporting the module under test, a monitoring unit, and a control unit. The control unit controls the operation of the monitoring unit and receives monitoring data from the monitoring unit. The monitoring unit includes a ranging module and a light metering module. The ranging module detects the distance between the module under test and the light source and / or the testing unit, and the light metering module detects the color temperature and / or illuminance of the light source. The ranging module includes a laser ranging component located near the first mounting unit and adapted to move synchronously with the first mounting unit. The light metering module includes a photosensitive chip that outputs the color temperature and illuminance test values ​​of the light source. The camera module testing system provided in this application helps improve the accuracy and reliability of automated testing, reduces testing time, increases testing efficiency, and enhances the usability of the camera module.

Description

Technical Field

[0001] This application relates to the field of camera module testing, and more particularly to a camera module testing system. Background Technology

[0002] In the field of optical module testing, light source systems, teleconverters, and test plates are the core components of vision inspection systems and are widely used in automated testing equipment for semiconductor packaging modules, camera modules, and display panel modules. These tests include various items such as dead pixel testing, blemish testing, optical center testing, vignetting testing, resolution testing, autofocus testing, and image stabilization testing, all of which have different requirements for distance and light source testing conditions.

[0003] However, during the testing process, the inspection of testing equipment often needs to be carried out manually at regular intervals, which has many drawbacks. For example, the inspection of light sources mainly relies on workers using a special illuminance meter. Every 24 hours, the machine needs to be stopped once, and the illuminance and color temperature of the light source need to be measured manually. The color temperature also needs to be adjusted manually, which greatly wastes testing time and the energy of the testing personnel.

[0004] Meanwhile, manually measuring and recording the distances between the camera module and the light source, teleconverter, and target plate using standard calipers or rulers is not only time-consuming and labor-intensive, but also relies heavily on the experience and skills of the testers, resulting in low reliability of the data and inherent testing risks. Furthermore, manual inspection requires the machine to be stopped, making the process cumbersome and time-consuming, significantly reducing the efficiency of module testing and failing to meet the increasing demands of high-efficiency production. Therefore, there is an urgent need to develop a high-precision automated inspection technology to further improve inspection efficiency and data reliability, thereby reducing testing risks. Summary of the Invention

[0005] One objective of this application is to provide a camera module testing system that reduces the time and cost spent on initial debugging and testing, thereby further improving testing efficiency.

[0006] Another objective of this application is to provide a camera module testing system that helps improve testing accuracy and the reliability of test data.

[0007] Another objective of this application is to provide a camera module testing system that is suitable for use under various testing conditions, enables automated testing, and further enhances market competitiveness.

[0008] To achieve the above objectives, the technical solution adopted in this application is as follows: a camera module testing system, comprising a light source, a testing unit, a first mounting unit for supporting the module under test, a monitoring unit, and a control unit. The control unit is used to control the operation of the monitoring unit and receive monitoring data from the monitoring unit. The monitoring unit includes a ranging module and a light measuring module. The ranging module is used to detect the distance between the module under test and the light source and / or the testing unit. The light measuring module is used to detect the color temperature and / or illuminance of the light source. The ranging module includes a laser ranging component, which is disposed on the periphery of the first mounting unit and is adapted to move synchronously with the first mounting unit to achieve the desired effect. The laser ranging component and the module under test are each at the same distance from the test unit, and / or the laser ranging component and the module under test are each at the same distance from the light source; the photometry module includes a photosensitive chip adapted to receive illumination from the light source and output a color temperature test value A1 and / or an illuminance test value B1 of the light source; the control unit includes a control chip communicatively connected to the photosensitive chip, the test values ​​of the photosensitive chip are adapted to be transmitted to the control chip, the control chip is adapted to output a color temperature correction value A2 and / or an illuminance correction value B2, and the control unit further includes a calibration module communicatively connected to the control chip, the calibration module being adapted to provide a color temperature correction coefficient k. A and / or illuminance correction factor k B A2=k A ×A1, B2 = k B ×B1.

[0009] In some embodiments, the color temperature correction coefficient k A The color temperature correction coefficient k is positively correlated with the color temperature test value A1 in a non-linear manner. A The first relationship between the color temperature test value A1 and the actual color temperature value A0 is obtained by fitting the color temperature test value A1 of multiple sets of the photosensitive chips with the actual color temperature value A0. The control chip is adapted to calculate the color temperature correction coefficient k based on the first relationship and the color temperature test value A1. A And according to the color temperature correction coefficient k A The color temperature correction value A2 is calculated from the color temperature test value A1; the illuminance correction coefficient k B The illuminance correction coefficient k is positively correlated with the illuminance test value B1 in a non-linear manner. B The second relationship between the illuminance test value B1 and the actual illuminance value B0 is obtained by fitting multiple sets of illuminance test values ​​B1 from the photosensitive chips to the actual illuminance value B0. The control chip is adapted to calculate the illuminance correction coefficient k based on the second relationship and the illuminance test value B1. B and according to the illuminance correction coefficient k BThe illuminance correction value B2 is calculated from the illuminance test value B1.

[0010] In some embodiments, the calibration module provides a plurality of color temperature correction coefficients, each of which corresponds to a plurality of distance ranges between the photosensitive chip and the light source; the calibration module also provides a plurality of illuminance correction coefficients, each of which corresponds to a plurality of distance ranges.

[0011] In some embodiments, the ranging module is used to measure the distance between the photosensitive chip and the light source, and the control chip is used to determine the color temperature correction coefficient k from a plurality of values ​​based on the distance between the photosensitive chip and the light source. A Select the corresponding color temperature correction coefficient k A and from the plurality of illuminance correction coefficients k B Select the corresponding illuminance correction coefficient k B .

[0012] In some embodiments, the control unit further includes a communication module that is communicatively connected to the control chip. The communication module is used to enable communication between the control unit and an external industrial control computer. The communication module includes one or more of the following: a Bluetooth module and an RS232 standard interface module.

[0013] In some embodiments, the ranging module further includes a gyroscope, and the control chip is communicatively connected to the laser ranging component and the gyroscope. The gyroscope is used to detect whether the angle of the ranging module meets a preset requirement.

[0014] In some embodiments, the camera module testing system further includes an adjustment module for adjusting the position of the ranging module. The adjustment module is communicatively connected to the control unit and is adapted to adjust the position of the ranging module according to the test data of the gyroscope so that the angle of the ranging module reaches the preset requirement.

[0015] In some embodiments, the test unit includes a teleconverter and a target plate. The teleconverter is movably disposed between the first mounting unit and the target plate, thereby adjusting the distance between the teleconverter and the module under test or the target plate by moving the teleconverter.

[0016] In some embodiments, the distance between the light metering module and the distance measuring module to the light source is equal to the distance between the module under test and the light source; the distance between the light metering module and the distance measuring module to the teleconverter is equal to the distance between the module under test and the teleconverter; and the distance between the light metering module and the distance measuring module to the target plate is equal to the distance between the module under test and the target plate.

[0017] In some embodiments, the camera module testing system further includes a second mounting unit for supporting the ranging module. The second mounting unit and the first mounting unit are adapted to move synchronously, and both the second mounting unit and the first mounting unit are directly facing the test unit and the light source, so that when the second mounting unit and the first mounting unit move synchronously, the distance between them and the test unit and the light source changes in the same way.

[0018] Compared with the prior art, the beneficial effects of this application are as follows:

[0019] (1) By using the monitoring unit provided in this application to detect the distance between the test unit and the light source, as well as to test the illuminance and / or color temperature of the light source, it is beneficial to improve the test accuracy and reliability, reduce the time spent on pre-debugging and testing, and further improve the test efficiency.

[0020] (2) By installing the module under test to the first installation unit and the distance measuring module to the second installation unit through this application, the distance between the module under test, the distance measuring module and the light source and the test unit can be synchronously adjusted, and various data can be automatically tested, thereby adapting to various test conditions and improving market competitiveness. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of some exemplary camera module testing systems in this application.

[0022] Figure 2 This is a schematic diagram of the structure of some exemplary camera module testing systems in this application.

[0023] Figure 3 This is a diagram of the color temperature data of some exemplary camera module testing systems in this application before calibration.

[0024] Figure 4 This is an image showing the illuminance data of some exemplary camera module test systems in this application before calibration.

[0025] Figure 5 This is a calibrated color temperature data diagram of some exemplary camera module testing systems in this application.

[0026] Figure 6 This is a flowchart of the test steps for some exemplary camera module test systems in this application.

[0027] In the diagram: 1. Module under test; 10. Light source; 20. Test unit; 21. Teleconverter; 22. Target plate; 30. First mounting unit; 40. Monitoring unit; 41. Ranging module; 411. Laser ranging component; 42. Light measurement module; 421. Photosensitive chip; 50. Control unit; 51. Control chip; 52. Calibration module; 60. Gyroscope; 70. Communication module; 71. Bluetooth module; 72. RS232 standard interface module. Detailed Implementation

[0028] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0029] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of this application.

[0030] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0031] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0032] To achieve the above objectives, such as Figures 1-6As shown, the technical solution adopted in this application is: a camera module testing system, including a light source 10, a testing unit 20, and a first mounting unit 30 for supporting the module under test 1, and also including a monitoring unit 40 and a control unit 50. The control unit 50 is used to control the operation of the monitoring unit 40 and receive the monitoring data of the monitoring unit 40. The monitoring unit 40 includes a distance measuring module 41 and a light measuring module 42. The distance measuring module 41 is used to monitor the distance between the module under test 1 and the light source 10 and / or the testing unit 20. The light measuring module 42 is used to monitor the color temperature and / or illuminance of the light source 10. The monitoring unit 40 is suitable for real-time monitoring of the testing environment of the module under test 1 without stopping, so as to ensure the accuracy of the testing system in real time.

[0033] It is worth mentioning that the light source 10, the test unit 20, and the first mounting unit 30 can all be used to build a camera module test system relative to the module under test 1. The camera module test system needs to be tested periodically to ensure the accuracy of the test results. However, existing testing methods rely on manual labor and require system downtime, which increases labor costs and significantly impacts testing efficiency. The test system proposed in this application, with its added monitoring unit 40, can achieve real-time monitoring of the test environment, eliminating the need for manual use of illuminance meters and rulers, greatly improving testing efficiency and reducing labor costs. This application includes a control unit 50 that receives data from the monitoring unit 40. The data from the monitoring unit 40 can be exported instantly, facilitating real-time monitoring and eliminating the need to intercept data at the backend to detect problems during the burning process. Furthermore, automated testing further avoids the risks of data loss and recording errors that can occur during manual measurement, thereby enhancing the controllability and reliability of the entire camera module test system and facilitating real-time adjustments.

[0034] In some embodiments, such as Figure 1 As shown, the ranging module 41 includes a laser ranging component 411, which is disposed on the periphery of the first mounting unit 30. The laser ranging component 411 is adapted to move synchronously with the first mounting unit 30, so that the laser ranging component 411 and the module under test 1 are each at the same distance from the testing unit 20, and / or, the laser ranging component 411 and the module under test 1 are each at the same distance from the light source 10. It is worth mentioning that the laser ranging component 411, with its advantages of high precision, non-contact measurement, and strong environmental adaptability, has become a core testing tool in fields such as industrial inspection and surveying. It not only has high ranging accuracy and a wide measurement range, completing a test cycle in less than 1 second, but also improves the performance of the testing system because it does not require contact with the target during testing.

[0035] Understandably, different test projects have different requirements for the distance between the module under test 1, the light source 10, and the test unit 20. Therefore, the first mounting unit 30 needs to be dynamically adjusted to change the distance between the module under test 1, the light source 10, and the test unit 20 to meet the test requirements. Simultaneously, since the ranging module 41 is used to measure the real-time distance between the module under test 1 and the light source 10 and the test unit 20, the ranging module 41 also needs to be dynamically adjusted to adapt to different positions of the module under test 1. Furthermore, the ranging module 41 uses a laser ranging component 411, which calculates the distance between the ranging module 41 and the object under test by acquiring the time it takes for the laser to travel from emission to reflection, thus obtaining the distance between the module under test 1 and the object under test. In other words, the relative position of the ranging module 41 and the module under test remains unchanged, thereby converting the distance data between the ranging module 41 and the object under test into the distance data between the module under test 1 and the object under test.

[0036] In some specific embodiments, such as Figure 2 As shown, the plane containing the ranging module 41 and the module under test 1 is parallel to the plane containing the light source 10 and the test unit 20. This ensures that the distance measured by the ranging module 41 to the light source 10 and the test unit 20 can be used to characterize the distance between the module under test 1 and the light source 10 and the test unit 20. The projections of the light source 10 and the test unit 20 in a direction perpendicular to the plane containing the light source 10 and the test unit 20 cover the ranging module 41 and the module under test 1. In some embodiments, such as... Figure 1 As shown, the photometry module 42 includes a photosensitive chip 421, which is adapted to receive illumination from the light source 10 and output the color temperature test value A1 and / or illuminance test value B1 of the light source 10. The photometry module 42 can test the color temperature and illuminance of the light source 10 in real time, enabling timely and accurate acquisition of illumination data for the test environment. It is understood that when detecting illuminance, the photosensitive chip 421 can accurately adapt to dynamic environments, has a wide detection range and high resolution, and can identify minute changes in light intensity, improving the accuracy of illuminance data detection. Furthermore, when detecting color temperature, the photosensitive chip 421 has a small detection error and a good detection range. Therefore, using the photosensitive chip 421 to output the color temperature test value A1 and illuminance test value B1 of the light source 10 helps improve the accuracy of the test data and further reduces the risk of data errors.

[0037] In some embodiments, such as Figure 2As shown, the light metering module 42 is also adapted to move synchronously with the first mounting unit 30, thereby ensuring that the illumination received by the light metering module 42 is basically the same as the illumination received by the module under test 1. For example, the light metering module 42, the distance measuring module 41, and the module under test 1 are all located on the same plane, and the projection of the light source 10 and the test unit 20 in the direction perpendicular to the plane where the light source 10 and the test unit 20 are located covers the light metering module 42, the distance measuring module 41, and the module under test 1.

[0038] In some embodiments, the test unit 20 includes a teleconverter 21 and a target plate 22. The target plate 22 can hold a picture card. The module under test 1 takes pictures and tests the picture card, and analyzes the imaging results to quantitatively evaluate various optical performance parameters of the module under test 1, which is beneficial to obtain more accurate parameters related to the module's performance. On the other hand, the telephoto distance of the camera module often reaches several meters. However, if a conventional distance is used for testing in actual testing, a large test space is required to meet the object distance requirements. The teleconverter 21 can generate an upright and magnified virtual image of a near object at a greater distance, thereby simulating the effect of long-distance imaging. This helps to reduce the test space of the module under test 1 and facilitates the layout of production line equipment. That is to say, if a focusing distance of 200cm is originally required to fill the image card with the image of the module under test 1, after using the teleconverter 21, only about 36.5cm of focusing distance is needed to achieve the same imaging effect, which helps to reduce the space occupied by testing and reduce production costs. Furthermore, since the test distance can be automatically controlled and monitored in this test, the manual measurement of distance using standard calipers or rulers is eliminated, which not only shortens the test time by 90% but also enhances the reliability of the test data. On the other hand, since the camera module test system of this application uses an electronic test and monitoring system, it can realize real-time detection of test data, thereby adapting to various test conditions and enhancing market competitiveness.

[0039] In one specific embodiment, such as Figure 2 As shown, the teleconverter 21 is movably disposed between the module under test 1 and the target plate 22. Therefore, the distance from the module under test 1 to the test unit 20 includes its distance to the teleconverter 21 and its distance to the target plate 22. Furthermore, the distance between the teleconverter 21 and the module under test 1, or the target plate 22, can be adjusted by moving the teleconverter 21. The target plate 22 can hold a chart. The module under test 1 is photographed and tested against the chart, and the imaging results are analyzed to quantitatively evaluate various optical performance parameters of the module under test, which helps to obtain more accurate parameters related to the module's performance.

[0040] Furthermore, such as Figure 2As shown, the ranging module 41, the light measuring module 42, and the module under test 1 are arranged on a horizontal plane, parallel to the plane containing the light source 10, the teleconverter 21, and the target plate 22. The distance between the ranging module 41 and the light source 10 is n1, the distance between the ranging module 41 and the teleconverter 21 is n2, and the distance between the ranging module 41 and the target plate 22 is n3. The distance between the module under test 1 and the light source 10 is m1, the distance between the module under test 1 and the teleconverter 21 is m2, and the distance between the module under test 1 and the target plate 22 is m3. Wherein, n1=m1, n2=m2, and n3=m3, so that the distances between the camera module and the light source 10, the teleconverter 21, and the target plate 22 measured by the camera module testing system are precisely matched with the actual distance data between the module under test 1 and the light source 10, the teleconverter 21, and the target plate 22, reducing the risk of errors. On the other hand, since the light metering module 42 and the distance measuring module 41 are located on the same horizontal plane, the distance from the light metering module 42 to the light source 10 is equal to n1, the distance to the teleconverter 21 is equal to n2, and the distance to the target plate 22 is equal to n3. Furthermore, since n1=m1, n2=m2, and n3=m3, it can be ensured that the light metering module 42 and the module under test 1 are located under the same lighting conditions, which helps to reduce the difference between the color temperature and illuminance data measured by the camera module testing system and the color temperature and illuminance data at the module under test 1.

[0041] It is worth noting that the test values ​​of the photosensitive chip 421 deviate to some extent from the true color temperature value A0 and the true illuminance value B0 of the light source 10. To further improve the accuracy of the test, this application also calibrates the test values ​​of the photosensitive chip 421. In some embodiments, the control unit 50 includes a control chip 51, which is communicatively connected to the photosensitive chip 421, and the test values ​​of the photosensitive chip 421 are adapted to be transmitted to the control chip 51. The control chip 51 can be a microcontroller, and its model can be, but is not limited to, SMT32. The control chip 51 is adapted to calibrate the test values ​​of the photosensitive chip 421 and output a color temperature correction value A2 and / or an illuminance correction value B2.

[0042] Specifically, such as Figure 1 As shown, the control unit 50 also includes a calibration module 52 that is communicatively connected to the control chip 51. The calibration module 52 is adapted to provide a color temperature correction coefficient k. A and / or illuminance correction factor k B Where, A2=k A ×A1, B2 = k B ×B1. Correction coefficients (including color temperature correction coefficient k) provided by calibration module 52. A and / or illuminance correction factor k BThe test values ​​are calibrated to more closely approximate the true color temperature value A0 and the true illuminance value B0, thereby improving data accuracy and further enhancing the data reliability of the camera module testing system of this application. The calibration module 52 stores correction coefficients. When the test value of the photosensitive chip 421 is input to the control chip 51, the control chip 51 retrieves the correction coefficients from the calibration module 52 and then calculates the corrected value. The reason for storing the correction coefficients separately in the calibration module 52 is that the correction coefficients vary depending on the photosensitive chip 421. The calibration module 52 needs to store the corresponding correction coefficients for each photosensitive chip 421. Therefore, storing the correction coefficients separately in the calibration module 52 facilitates the easy recording of correction coefficients at any time.

[0043] Furthermore, such as Figures 3-5 As shown, in the embodiments of this application, the relationship between the correction coefficient and the test value is a non-linear positive correlation. That is, the correction coefficient is not a constant, which makes the corrected value more accurate.

[0044] In some embodiments, the color temperature correction factor k A The color temperature is obtained by fitting multiple sets of color temperature data. Each set of color temperature data includes a true color temperature value A0 and a measured color temperature value A1. The true color temperature value A0 is measured by a spectroradiometer CL-500A and / or CL-200A, while the measured color temperature value A1 is measured by a photosensitive chip 421. On the other hand, the illuminance correction coefficient k... B The illuminance data is obtained by fitting multiple sets of illuminance data. Each set of illuminance data includes the true illuminance value B0 and the measured illuminance value B1. The true illuminance value B0 is measured by a spectroradiometer CL-500A and / or CL-200A, and the measured illuminance value B1 is measured by a photosensitive chip 421.

[0045] In some embodiments, the color temperature correction factor k A The color temperature correction coefficient k shows a non-linear positive correlation with the color temperature test value A1. A The first relationship between the color temperature test value A1 and the actual color temperature value A0 is obtained by fitting the color temperature test value A1 of multiple photosensitive chips 421 with the actual color temperature value A0. The control chip 51 is adapted to calculate the color temperature correction coefficient k based on the first relationship and the color temperature test value A1. A And based on the color temperature correction factor k AThe color temperature correction value A2 is calculated from the color temperature test value A1. For example, the true color temperature value A0 corresponding to any set of color temperature data is within the range of 2000K to 5000K, and the difference between two adjacent true color temperature values ​​A0 is 500K. That is, in this embodiment of the application, within the color temperature range of 2000K to 5000K, a sample point is taken every 500K, and the color temperature of each sample point is tested using the photosensitive chip 421 to obtain multiple sets of color temperature data. Each set of data includes the color temperature test value A1 output by the photosensitive chip 421 and the corresponding true color temperature value A0 of the sample point. The true color temperature value A0 is compared with the color temperature test value A1 measured by the photosensitive chip 421, such as... Figure 3 As shown, the color temperature test value A1 is the average of five tests taken by the photosensitive chip 421 at the corresponding sample point. It can be understood that the error of the color temperature test value A1 measured by the photosensitive chip 421 is not fixed, but is affected by the true color temperature value A0 in the environment, resulting in a non-linear relationship between this error and the color temperature test value A1. Therefore, the color temperature correction coefficient k provided in this embodiment of the application... A It exhibits a non-linear positive correlation with the color temperature test value A1, enabling the corrected color temperature value A2 to be closer to the true color temperature value A0.

[0046] On the other hand, the illuminance correction factor k B The illuminance correction coefficient k shows a non-linear positive correlation with the illuminance test value B1. B The second relationship between the illuminance test value B1 and the actual illuminance value B0 is also obtained by fitting the illuminance test values ​​B1 from multiple sets of photosensitive chips 421 with the actual illuminance value B0. The control chip 51 is adapted to calculate the illuminance correction coefficient k based on the second relationship and the illuminance test value B1. B And according to the illuminance correction factor k B The illuminance correction value B2 is calculated from the illuminance test value B1. For example, the actual illuminance value B0 corresponding to any set of illuminance data is within the range of 200 lux to 2500 lux, and the difference between two adjacent actual illuminance values ​​B0 is 300 lux. That is, in this embodiment of the application, within the illuminance range of 200 lux to 2500 lux, a sampling point is taken every 300 lux, and the illuminance of each sampling point is tested using the photosensitive chip 421 to obtain multiple sets of illuminance data. Each set of data includes the illuminance test value B1 output by the photosensitive chip 421 and the corresponding actual illuminance value B0 of the sampling point. The actual illuminance value B0 is compared with the illuminance test value B1 measured by the photosensitive chip 421, such as... Figure 4 As shown, the illuminance test value B1 is the average of five tests taken by the photosensitive chip 421 at the corresponding sampling point. It is understood that the error of the illuminance test value B1 measured by the photosensitive chip 421 is not fixed and is also affected by the true illuminance value B0 in the environment. This results in a non-linear relationship between the error and the illuminance test value B1. Therefore, the illuminance correction coefficient k provided in this embodiment of the application...B It also exhibits a non-linear positive correlation with the illuminance test value B1, which helps to make the corrected illuminance correction value B2 closer to the true illuminance value B0.

[0047] Understandably, by comparing the test values ​​with the actual values, it was found that there are large deviations between the test values ​​and the actual values ​​in the high color temperature and high illuminance regions, while the deviations between the test values ​​and the actual values ​​are smaller in the low color temperature region. Therefore, it is necessary to fit the relationship between the color temperature test value A1, the illuminance test value B1 and their correction coefficients to make the corrected values ​​more closely match the actual values ​​and improve the reliability of the data.

[0048] Further preferred, such as Figure 5 As shown, the color temperature correction coefficient k can be obtained by polynomial fitting based on the least squares method. A The relationship between the color temperature test value A1 and the illuminance correction coefficient k B The relationship f(B1) between the illuminance test value B1 and the continuous data relationship is obtained by fitting discrete data points. Furthermore, a color temperature correction coefficient k, which is closer to the true color temperature value A0 and the true illuminance value B0 during the test, is obtained after fitting. A and illuminance correction factor k B By substituting the color temperature correction value A2 and the illuminance correction value B2 into the calculation formula, we can obtain fitting data that is closer to the true color temperature value A0 and the true illuminance value B0.

[0049] A further preferred embodiment can be the color temperature correction coefficient k, calculated based on the attenuation function derived from the response attenuation characteristics of the photosensitive chip 421 to light of different wavelengths. A The relationship between the color temperature test value A1 and the illuminance correction coefficient k B The relationship f(B1) with the illuminance test value B1 can be understood as follows: by comparing the degree of attenuation at different wavelengths, the gain of brightness of each color channel and the image is adjusted to compensate for the deviation of color temperature and illuminance.

[0050] In one possible implementation, calibration module 52 provides multiple color temperature correction coefficients k. A Multiple color temperature correction coefficients k A These correspond to multiple distance ranges between the photosensitive chip 421 and the light source 10. The calibration module 52 provides multiple illuminance correction coefficients k. B Multiple illuminance correction coefficients k B These correspond to multiple distance ranges. The ranging module 41 measures the distance between the photosensitive chip 421 and the light source 10, and the control chip 51 determines the distance based on the distance between the photosensitive chip 421 and the light source 10 from multiple color temperature correction coefficients k. A Select the appropriate color temperature correction factor k AAnd from multiple illuminance correction factors k B Select the appropriate illuminance correction factor k B This increases the adaptability of the testing system to various application environments.

[0051] As an example, the calibration module 52 stores multiple correction coefficients, which correspond to different distances from the light source 10. It is understood that the distance from the photosensitive chip 421 to the light source 10 affects the accuracy of the color temperature and illuminance measured by the photosensitive chip 421. Therefore, in this embodiment, different distances from the light source 10 correspond to different correction coefficients. The control unit 50 can use the ranging module 41 to measure the distance from the photosensitive chip 421 to the light source 10, and obtain the corresponding correction coefficient from the calibration module 52 based on this distance. The control unit then uses this correction coefficient to correct the color temperature and illuminance measured by the photosensitive chip 421 to obtain more accurate color temperature and illuminance information. For example, the calibration module 52 stores multiple color temperature correction coefficients k. A Multiple color temperature correction coefficients k A These correspond to multiple distance ranges between the photosensitive chip 421 and the light source 10. The aforementioned ranging module 41 is used to measure the distance between the photosensitive chip 421 and the light source 10. The control chip 51, based on the distance between the photosensitive chip 421 and the light source 10, selects from multiple color temperature correction coefficients K... A Select the color temperature correction factor K corresponding to that distance. A Then, based on the color temperature correction coefficient K A The color temperature correction value A2 is calculated from the color temperature test value A1. For example, calibration module 52 stores multiple illuminance correction coefficients k. B Multiple illuminance correction coefficients k B These correspond to multiple distance ranges. The aforementioned ranging module 41 is used to measure the distance between the photosensitive chip 421 and the light source 10. The control chip 51, based on the distance between the photosensitive chip 421 and the light source 10, selects from multiple illuminance correction coefficients K. B Select the illuminance correction factor K corresponding to this distance. B Then, based on the illuminance correction factor K B Calculate the illuminance correction value B2 based on the illuminance test value B1.

[0052] As another example, calibration module 52 specifically provides a color temperature correction coefficient k. A The first relationship between the color temperature test value A1 and the illuminance correction coefficient k B Based on the second relationship between the illuminance test value B1 and the first relationship, the control chip 51 calculates the color temperature correction coefficient k according to the color temperature test value A1. A And calculate the illuminance correction coefficient k based on the second relation and the illuminance test value B1. B .

[0053] In this example, the calibration module 52 can also provide multiple first relationships and multiple second relationships, which correspond to multiple distance ranges between the photosensitive chip 421 and the light source 10, respectively. The control chip 51 selects a first relationship from the multiple first relationships corresponding to the distance between the photosensitive chip 421 and the light source 10, and then calculates the color temperature correction coefficient k based on the first relationship and the color temperature test value A1. A The control chip 51 selects the second relational formula corresponding to the distance between the photosensitive chip 421 and the light source 10 from multiple second relational formulas, and then calculates the illuminance correction coefficient k based on the second relational formula and the illuminance test value B1. B In this example, different distances between the photosensitive chip 421 and the light source 10 correspond to different formulas. The control unit 50 can use the actual distance between the photosensitive chip 421 and the light source 10 to select an appropriate formula to calculate the color temperature correction coefficient K. A Illuminance correction factor K B Using this color temperature correction coefficient K A Illuminance correction factor K B The color temperature and illuminance measured by the photosensitive chip 421 are corrected to obtain more accurate color temperature and illuminance information.

[0054] In another possible implementation, different photosensitive chips 421 also correspond to different correction coefficients, so the calibration module 52 can determine the fitted color temperature correction coefficient k for each photosensitive chip 421. A and illuminance correction factor k B Then, the correction coefficient is stored in the calibration module 52, thereby enhancing the accuracy of the test data from the photosensitive chip 421. In other words, during the actual testing process, the photosensitive chip 421 first transmits the tested color temperature value A1 and illuminance value B1 to the control unit 50, and the control unit 50 then extracts the stored color temperature correction coefficient k from the calibration module 52. A and illuminance correction factor k B The calculations are performed to output a color temperature correction value A2 and an illuminance correction value B2 that are closer to the actual data.

[0055] In another possible implementation, a general preliminary correction coefficient can be stored in the calibration module 52 first. After replacing the photosensitive chip 421, the correction coefficient can be obtained by adjusting the preliminary correction coefficient, so that the correction coefficient matches the photosensitive chip 421 used. This helps to improve the accuracy of the measurement data and enhance the performance of the test system.

[0056] In some embodiments, the calibration module 52 includes an electrically erasable programmable read-only memory for storing color temperature correction coefficients k. A and illuminance correction factor kB The calibration module 52 stores the correction coefficients, which are typically used during the factory calibration of the photosensitive chip 421, which is connected to the control unit 50, at the time of the entire test system's shipment. The obtained k... A =f(A1) and k B The relation =f(B1) is stored in the calibration module 52 of the control unit 50.

[0057] In some embodiments, this application provides a calibration method for testing the photosensitive chip 421 and the light source 10, which can obtain the calibration coefficient k. A k B This further includes the following steps:

[0058] S100, The photosensitive chip 421 used to detect the color temperature and illuminance of the light source 10 is exposed to the illumination of the light source 10;

[0059] S200: Change the color temperature of light source 10, use a spectroradiometer to measure the true color temperature value A0 after each color temperature change, and use photosensitive chip 421 to obtain the color temperature test value A1 after each color temperature change of light source 10; change the illuminance of light source 10, use a spectroradiometer to measure the true illuminance value B0 after each illuminance change, and use photosensitive chip 421 to obtain the illuminance test value B1 after each illuminance change.

[0060] S300, based on multiple sets of true color temperature values ​​A0 and color temperature test values ​​A1, performs fitting to obtain A. 0 / The relation A1=f(A1), A 0 / A1 is denoted as k A Similarly, based on multiple sets of true illuminance values ​​B0 and measured illuminance values ​​B1, a fitting process is performed to obtain the relationship B0 / B1=f(B1), where B0 / B1 is denoted as k. B ;

[0061] S400, will k A =f(A1) and k B The relation f(B1) is stored in the control unit 50, which is communicatively connected to the photosensitive chip 421, so that the control unit 50 is adapted to correct the color temperature test value A1 and the illuminance test value B1 measured by the photosensitive chip 421.

[0062] It is worth mentioning that the light source 10 in the above steps S100 and S200 can be the same as or different from the light source 10 of the test system of this application. The purpose of setting the light source 10 in steps S100 and S200 is mainly to obtain the test values ​​of the photosensitive chip 421 under different color temperatures and different illuminances, and then obtain the correction coefficient, so that when the test system of this application uses the photosensitive chip 421 to perform color temperature and illuminance tests on the light source 10, the output color temperature value and illuminance value are closer to the true value of the light source 10.

[0063] To improve the accuracy of the calibration, in step S200, the color temperature test value A1 and the illuminance test value B1 are both taken as the average value of five tests conducted by the photosensitive chip 421.

[0064] Furthermore, in step S200, the color temperature range is 2000K to 5000K. Within this range, at least five different color temperature samples are taken at equal intervals for testing. In one specific embodiment, a color temperature sample is taken every 500K. It can be understood that the more color temperature samples taken, the more accurate the fitted relationship will be, and the closer the corrected color temperature data will be to the true value.

[0065] In step S200, the illuminance range is 200 lux to 2500 lux, and within this range, at least five different illuminance samples are taken at equal intervals for testing. In one specific embodiment, an illuminance sample is taken at every 300 lux interval for testing.

[0066] In step S300, the relation k can be obtained by polynomial fitting based on the least squares method. A =f(A1) and k B =f(B1).

[0067] It is worth mentioning that after replacing the photosensitive chip 421, due to individual differences between photosensitive chips 421, the fitting relationship will also differ. Inaccurate calibration will lead to a decrease in the accuracy of the test data. Therefore, it is necessary to recalibrate the photosensitive chip 421 and store the correction coefficients in the calibration module 52 to ensure the accuracy of the test data. The recalibration method can also refer to the aforementioned steps S100~S400. The correction coefficients in the calibration module 52 are matched with the photosensitive chip 421 used, which helps to improve the accuracy of the measurement data and enhance the performance of the test system.

[0068] In some embodiments, the control unit 50 includes a communication module 70 communicatively connected to the control chip 51. The communication module 70 is used to enable communication between the control unit 50 and an external industrial control computer to receive test commands from testers. The communication module 70 includes one or more of the following: a Bluetooth module 71 and an RS232 standard interface module 72. It is understood that communication with the industrial control computer is possible through the provided Bluetooth module 71 and RS232 standard interface module 72, with low command latency and good operational stability even during prolonged operation.

[0069] In some embodiments, the ranging module 41 further includes a gyroscope 60 communicatively connected to the control chip 51. The gyroscope 60 is used to detect whether the angle of the ranging module 41 meets a preset requirement. The gyroscope 60 can prevent deviations caused by equipment installation problems during distance testing, further improving the accuracy of the measurement data.

[0070] For example, the camera module testing system also includes an adjustment module for adjusting the position of the ranging module 41. The adjustment module is communicatively connected to the control unit 50. The control unit 50 is adapted to adjust the position of the ranging module 41 using the adjustment module based on the test data from the gyroscope 60, so that the angle of the ranging module 41 reaches a preset requirement. It is understood that the adjustment module may include a motor communicatively connected to the control unit 50.

[0071] As another example, the control unit 50 can compensate for the distance data measured by the ranging module 41 based on the tilt data of the gyroscope 60 and the positional relationship between the ranging module 41 and the module under test 1.

[0072] It is worth mentioning that the plane in which the ranging module 41 and the module under test 1 are located is the first plane. The angle between the plane in which the teleconverter 21, the target plate 22, or the light source 10 are located and the first plane is less than a threshold to meet the preset requirements, thereby ensuring that the ranging module 41 and the module under test 1 are in a stable detection environment and improving the accuracy of the detection data.

[0073] In other embodiments, the monitoring unit 40 includes a plurality of ranging modules 41 disposed around the periphery of the module 1 to be measured, and the distance between the module 1 to be measured and the object to be measured (light source 10, target plate 22 or teleconverter 21) is characterized by the average distance measured by the plurality of ranging modules 41.

[0074] In some embodiments, the camera module testing system includes a second mounting unit for supporting the ranging module 41. The second mounting unit and the first mounting unit 30 are adapted to move synchronously, and both the second mounting unit and the first mounting unit 30 are directly facing the test unit 20 and the light source 10, so that when the second mounting unit and the first mounting unit 30 move synchronously, the distance changes between them and the test unit 20 and the light source 10 are the same. It is worth mentioning that by mounting the module under test 1 to the first mounting unit 30 and the ranging module 41 and the light metering module 42 to the second mounting unit, the distances between the module under test 1, the ranging module 41, the light source 10, and the test unit 20 can be synchronously adjusted, and various data can be automatically tested, thereby adapting to various testing conditions and enhancing market competitiveness. In other words, the camera module testing system provided by this application can flexibly adjust the distance, and therefore can be used in testing projects with different requirements for distance and the light source 10.

[0075] Among them, the synchronous displacement of the test module 1 and the ranging module 41 can also ensure that the test module 1, the ranging module 41 and the photometric module 42 are tested under the same test conditions, further improving the accuracy of the test data.

[0076] The camera module testing system provided in this application allows for flexible adjustment of the position of the module under test 1, making it applicable to various testing projects with different distance requirements, such as dead pixel testing, blemish testing, optical center testing, vignetting testing, resolution testing, autofocus testing, and image stabilization testing. Furthermore, since this system can perform not only distance testing but also illuminance and color temperature testing of the light source 10, it can achieve closed-loop control of the illuminance and color temperature of the light source 10, as well as the distances between the module under test 1 and the light source 10, the target plate 22, and the teleconverter 21, in different testing projects. For example, dead pixel testing includes bright-state testing (white spot testing) and dark-state testing (black spot testing). Bright-state testing requires the illuminance of the light source 10 to be in the range of 500 lux to 1000 lux, while dark-state testing requires the illuminance of the light source 10 to be less than 10 lux. Both bright-state and dark-state testing require the distance between the module under test 1 and the light source 10 to be approximately 1 cm. Therefore, the camera module testing system provided in this application, which can adjust and monitor the test conditions such as test distance, light source illuminance, and color temperature, not only has the advantages of convenient and fast testing, but also provides accurate test data and has good performance.

[0077] In some embodiments, the camera module testing system of this application uses the following steps:

[0078] A100 and control unit 50 send commands to gyroscope 60 to detect the angle of ranging module 41 until the preset requirements are met;

[0079] A200, the mobile camera module testing system and the module under test 1 are placed at a one-time programmable (OTP) station. After the light source 10 completely covers the ranging module 41 and the light metering module 42, the distance between the light source 10 and the ranging module 41 is measured using the ranging module 41. The distance value measured by the ranging module 41 can be used to characterize the distance between the light source 10 and the light metering module 42. When the distance between the light source 10 and the light metering module 42 is within the standard distance, the color temperature correction value A2 and the illuminance correction value B2 are measured. When the color temperature correction value A2 and the illuminance correction value B2 are within the specified range, the color temperature and illuminance of the module under test 1 are programmed. When the color temperature correction value A2 and the illuminance correction value B2 are not within the specified range, step A100 is repeated.

[0080] The A300 mobile camera module test system and the module under test 1 are placed at the Auto Focus Control (AFC) station. The ranging module 41, teleconverter 21 and target plate 22 of the camera module test system are placed at a designated position on the same straight line. The distance between the ranging module 41 and the target plate 22 is checked to see if it is within the specified range.

[0081] A400: Move the teleconverter 21 to the designated position and test the distance between the ranging module 41 and the teleconverter 21. If the distance between the ranging module 41 and the teleconverter 21 is within the specified range, proceed to step A500. If the distance between the ranging module 41 and the teleconverter 21 is not within the specified range, repeat step A300.

[0082] The A500 outputs test data through an industrial control computer and provides feedback on the test results.

[0083] In this context, the AFC (Autofocus) position refers to moving the camera module testing system and the module under test (DUT) 1 to the component or position responsible for the autofocus function within the AFC testing equipment to test the autofocus performance of the DUT 1. Furthermore, the AFC testing equipment allows for adjustment of the image distance to further test the autofocus capability of the DUT 1 under various distance conditions. It can also detect the distance between the DUT 1 and the subject, the color temperature of the light source 10, and the illuminance, ensuring that the distance between the DUT 1 and the subject remains within the focusing range of the camera module.

[0084] It is worth mentioning that the specified range and designated location can be determined through the test items, thus it can be applied to various testing positions, such as one-time programmable programming, automatic focusing control, finished product inspection and packaging, wafer-level testing, and micro-module wafer testing. Furthermore, the camera module testing system provided in this application can monitor the system at regular intervals based on the testing conditions, or perform real-time monitoring during the testing process. This facilitates automated testing of the color temperature and illuminance of the light source 10, the distance between the module under test 1 and the light source 10, the distance between the module under test 1 and the standard plate 22, and the distance between the module under test 1 and the teleconverter 21. This avoids downtime testing and improves production efficiency.

[0085] The aforementioned camera module testing system of this application can be performed according to... Figure 6 The process shown is as follows.

[0086] First, the monitoring unit 40 needs to be factory calibrated. Factory calibration may include distance calibration and light source 10 calibration. Distance calibration involves testing and correcting the laser ranging component 411 under standard distance conditions, and storing the distance correction coefficients in the control unit 50, for example, in the calibration module 52. The method for calibrating the light source 10 can refer to the calibration method for testing the light source 10 in the aforementioned photosensitive chip 421 of this application.

[0087] Second, the testing workflow of the testing system includes:

[0088] (1) Start self-test: First, the industrial control computer sends a command wirelessly or via wired means. The ranging module 41 uses its gyroscope 60 to check whether its own placement angle is correct. After confirming that the angle of the ranging module 41 is correct, it enters the test state.

[0089] (2) OTP (One-Time Programming) Test: Move the first installation unit 30 and the monitoring unit 40 to the OTP station to ensure that the light source 10 completely covers the test area. At this time, the industrial control computer sends a distance test command to the control unit 50 to ensure that the distance between the monitoring unit 40 and the light source 10 is within the standard distance (that is, to ensure that the distance between the module under test 1 and the light source 10 is within the standard distance). The industrial control computer sends a test command for the light source 10 to the control unit 50. The photosensitive chip 421 of the monitoring unit 40 tests the OTP light source 10 data, including color temperature and illuminance. If the color temperature and illuminance need to be switched, the industrial control computer coordinates the switching of the number of data saving times between the light source 10 and the control unit 50. The color temperature and illuminance of the light source 10 are switched once, and the data is saved once so that the data can be retrieved later. It can be understood that OTP refers to one-time programmable. The purpose of this test is to uniformly burn the color temperature of the photosensitive chip 421 of the module under test 1 so that the photosensitive chip 421 of each module under test 1 is consistent. The OTP process is as follows: First, the monitoring unit 40 of this application detects the color temperature and illuminance of the environment where the module under test 1 is located. When the color temperature and illuminance are within the specified range, the module under test 1 is placed in the first installation unit 30 for burning. When the color temperature and illuminance are not within the specified range, step (1) is repeated.

[0090] (3) AFC (Autofocus) test: Move the first installation unit 30 and the monitoring unit 40 to the AFC station, ensuring that the plane where the monitoring unit 40 and the module under test 1 are located is parallel to the teleconverter 21 and the target plate 22. After the industrial control computer sends the distance test command, the distance measuring module 41 measures the distance between itself and the target plate 22. The industrial control computer judges whether the distance is normal. After the distance of the target plate 22 is normal, move the teleconverter 21 to the designated position. The industrial control computer sends the test distance command. The distance measuring module 41 measures the distance between itself and the teleconverter 21. After the industrial control computer judges that the distance is normal, the industrial control computer returns all data to the user and provides feedback on the test results. When the industrial control computer judges that the distance is abnormal, step (3) is restarted.

[0091] The testing system of this application can be turned on for monitoring at regular intervals (such as every 2 hours) or it can be turned on for testing when the module under test 1 is being tested, depending on the actual situation.

[0092] In some embodiments, the camera module testing system further includes an infrared testing component for detecting the motion trajectory of the module under test 1, which helps to monitor whether the motion trajectory of the module under test 1 is correct, and further improves the detection accuracy and data reliability of the camera module testing system.

[0093] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A camera module testing system, characterized in that, The device includes a light source, a testing unit, a first mounting unit for supporting the module under test, a monitoring unit, and a control unit. The control unit controls the operation of the monitoring unit and receives monitoring data from the monitoring unit. The monitoring unit includes a distance measuring module and a light measuring module. The distance measuring module detects the distance between the module under test and the light source and / or the testing unit. The light measuring module detects the color temperature and / or illuminance of the light source. The light measuring module, the distance measuring module, and the module under test are located on the same plane. The projections of the light source and the testing unit in a direction perpendicular to the plane containing the light source and the testing unit cover the light measuring module, the distance measuring module, and the module under test. The ranging module includes a laser ranging component, which is disposed on the periphery of the first mounting unit and is adapted to move synchronously with the first mounting unit so that the laser ranging component and the module under test are each at the same distance from the test unit, and / or the laser ranging component and the module under test are each at the same distance from the light source. The photometric module includes a photosensitive chip, which is adapted to receive illumination from the light source and output the color temperature test value A1 and / or illuminance test value B1 of the light source. The control unit includes a control chip and a calibration module communicatively connected to the control chip. The control chip is communicatively connected to the photosensitive chip, and the test values ​​from the photosensitive chip are adapted to be transmitted to the control chip. The control chip is adapted to output a color temperature correction value A2 and / or an illuminance correction value B2. The calibration module is adapted to provide a color temperature correction coefficient k. A and / or illuminance correction factor k B Wherein, A2 and A1 satisfy: A2=k A ×A1; B1 and B2 satisfy: B2=k B ×B1; The calibration module provides multiple color temperature correction coefficients, each corresponding to a multiple distance range between the photosensitive chip and the light source; the calibration module also provides multiple illuminance correction coefficients, each corresponding to a multiple distance range; the ranging module measures the distance between the photosensitive chip and the light source, and the control chip measures the distance between the photosensitive chip and the light source based on the multiple color temperature correction coefficients k. A Select the corresponding color temperature correction coefficient k A and from the plurality of illuminance correction coefficients k B Select the corresponding illuminance correction coefficient k B .

2. The camera module testing system according to claim 1, characterized in that, The color temperature correction coefficient k A The color temperature correction coefficient k is positively correlated with the color temperature test value A1 in a non-linear manner. A The first relationship between the color temperature test value A1 and the actual color temperature value A0 is obtained by fitting the color temperature test value A1 of multiple sets of the photosensitive chips with the actual color temperature value A0. The control chip is adapted to calculate the color temperature correction coefficient k based on the first relationship and the color temperature test value A1. A And according to the color temperature correction coefficient k A The color temperature correction value A2 is calculated from the color temperature test value A1; The illuminance correction coefficient k B The illuminance correction coefficient k is positively correlated with the illuminance test value B1 in a non-linear manner. B The second relationship between the illuminance test value B1 and the actual illuminance value B0 is obtained by fitting multiple sets of illuminance test values ​​B1 from the photosensitive chips to the actual illuminance value B0. The control chip is adapted to calculate the illuminance correction coefficient k based on the second relationship and the illuminance test value B1. B and according to the illuminance correction coefficient k B The illuminance correction value B2 is calculated from the illuminance test value B1.

3. The camera module testing system according to claim 2, characterized in that, The control unit also includes a communication module that is communicatively connected to the control chip. The communication module is used to enable communication between the control unit and an external industrial control computer. The communication module includes one or more of the following: a Bluetooth module and an RS232 standard interface module.

4. The camera module testing system according to any one of claims 1-3, characterized in that, The ranging module also includes a gyroscope. The control chip is communicatively connected to the laser ranging component and the gyroscope. The gyroscope is used to detect whether the angle of the ranging module meets the preset requirements.

5. The camera module testing system according to claim 4, characterized in that, The camera module testing system also includes an adjustment module for adjusting the position of the ranging module. The adjustment module is communicatively connected to the control unit and is adapted to adjust the position of the ranging module according to the test data of the gyroscope so that the angle of the ranging module reaches the preset requirement.

6. The camera module testing system according to any one of claims 1-3, characterized in that, The test unit includes a teleconverter and a target plate. The teleconverter is movably disposed between the first mounting unit and the target plate, so that by moving the teleconverter, the distance between the teleconverter and the module under test or the target plate can be adjusted.

7. The camera module testing system according to claim 6, characterized in that, The distances from the light metering module and the distance measuring module to the light source are equal to the distances from the module under test to the light source; the distances from the light metering module and the distance measuring module to the teleconverter are equal to the distances from the module under test to the teleconverter; the distances from the light metering module and the distance measuring module to the target plate are equal to the distances from the module under test to the target plate.

8. The camera module testing system according to any one of claims 1-3, characterized in that, The camera module testing system further includes a second mounting unit for supporting the ranging module. The second mounting unit and the first mounting unit are adapted to move synchronously, and both the second mounting unit and the first mounting unit are directly facing the test unit and the light source, so that when the second mounting unit and the first mounting unit move synchronously, the distance between them and the test unit and the light source changes in the same way.

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