Camera module pressure detection method and device

Abstract

The application discloses a camera module pressure detection method and device, wherein the method comprises the following steps: obtaining first MTF data of a camera module when the camera module is not assembled; obtaining second MTF data of the camera module after the camera module is assembled to a whole machine; obtaining a first difference value by subtracting the first MTF data from the second MTF data, and comparing the first difference value with a first set threshold; and judging a pressure condition of the camera module according to a comparison result. The application can detect the pressure condition of the camera module in the whole machine, thereby being beneficial to guaranteeing the use effect of the camera module in the whole machine.

Description

Technical Field

[0001] This application relates to the field of camera module testing technology, and in particular to a method and apparatus for testing camera modules under pressure. Background Technology

[0002] As the mobile phone industry places increasingly higher demands on camera modules, and with the trend towards full-screen displays, there is a greater need for smaller, high-pixel front camera modules. High pixel counts make the front camera module more sensitive to external forces, leading to SFR (Surface Reflectance Rate) degradation when subjected to such forces. However, currently, there is no technology to detect the pressure conditions on the front camera module within the entire device.

[0003] Therefore, it is necessary to provide a method for detecting pressure on a camera module, which can detect the pressure condition of the camera module in the whole machine. Summary of the Invention

[0004] The purpose of this application is to provide a method, apparatus, testing equipment, and computer-readable storage medium for detecting pressure on a camera module.

[0005] To achieve the above objectives, this application provides a method for detecting pressure on a camera module, comprising:

[0006] Obtain the first MTF data when the camera module is not assembled;

[0007] Obtain the second MTF data of the camera module after it is assembled into the whole machine;

[0008] The difference between the first MTF data and the second MTF data is calculated to obtain a first difference value, and the first difference value is compared with a first set threshold value;

[0009] The pressure condition of the camera module is determined based on the comparison results.

[0010] Optionally, the first MTF data is stored in the storage unit of the camera module;

[0011] The acquisition of the first MTF data when the camera module is not assembled includes:

[0012] The first MTF data is obtained from the storage unit.

[0013] Optionally, the device is provided with a drive interface for reading the storage unit.

[0014] Optionally, after the first MTF data is obtained through testing, it is uploaded to the MES system, and the MES system writes the first MTF data into the storage unit.

[0015] Optionally, determining the pressure condition of the camera module based on the comparison result includes:

[0016] If the first difference is less than or equal to the first set threshold, the camera module is considered to be under normal pressure.

[0017] If the first difference is greater than or equal to or greater than the first set threshold, then the camera module is considered to be under abnormal pressure and / or itself is abnormal.

[0018] Optionally, if the first difference is greater than or equal to or greater than the first preset threshold, the method further includes:

[0019] The third MTF data of the camera module was obtained by testing after the pressure structure on the camera module was removed.

[0020] The difference between the first MTF data and the third MTF data is used to obtain a second difference value, and the second difference value is compared with a second set threshold value.

[0021] If the second difference is less than or equal to the second set threshold, the camera module is considered to be under abnormal pressure.

[0022] If the second difference is greater than or equal to or greater than the second set threshold, then the camera module itself is considered to be abnormal.

[0023] Optionally, the second set threshold is equal to or less than the first set threshold.

[0024] To achieve the above objectives, this application also provides a camera module pressure detection device, including a module for performing the camera module pressure detection method as described above.

[0025] To achieve the above objectives, this application also provides a testing device, comprising:

[0026] processor;

[0027] A memory in which executable instructions of the processor are stored;

[0028] The processor is configured to execute the camera module pressure detection method described above by executing the executable instructions.

[0029] To achieve the above objectives, this application also provides a computer-readable storage medium having a program stored thereon, which, when executed by a processor, implements the camera module pressure detection method as described above.

[0030] This application also provides a computer program product or computer program including computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the electronic device to perform the camera module pressure detection method as described above.

[0031] This application obtains the first MTF data of the camera module when it is not assembled and the second MTF data after it is assembled into the whole machine, and compares the difference between the two with a first set threshold. Then, it can determine the pressure status of the camera module based on the comparison result, that is, whether the pressure is normal or there may be abnormal pressure, which helps to ensure the use effect of the camera module in the whole machine. Attached Figure Description

[0032] Figure 1 This is a flowchart of the pressure detection method for a camera module according to an embodiment of this application.

[0033] Figure 2 This is another flowchart of the pressure detection method for the camera module in this application embodiment.

[0034] Figure 3 This is another flowchart of the pressure detection method for the camera module in this application embodiment.

[0035] Figure 4 This is a schematic block diagram of the pressure detection device for the camera module in an embodiment of this application.

[0036] Figure 5 This is another schematic block diagram of the camera module pressure detection device in the embodiments of this application.

[0037] Figure 6 This is a schematic block diagram of the test equipment in an embodiment of this application. Detailed Implementation

[0038] To explain in detail the technical content, structural features, objectives and effects of this application, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0039] Example 1

[0040] Please see Figures 1 to 3 This application discloses a method for detecting pressure on a camera module, including:

[0041] 101. Obtain the first MTF data when the camera module is not assembled, and the second MTF data after the camera module is assembled into the whole machine. The first MTF data and the second MTF data are respectively the MTF data obtained by testing when the camera module is in an unassembled state (single unit) and the MTF data obtained by testing when it is in an assembled state (assembled into the whole machine).

[0042] Specifically, the first MTF data is stored in the storage unit of the camera module.

[0043] Obtain the first MTF data when the camera module is not assembled, including:

[0044] Retrieve the first MTF data from the storage unit.

[0045] By storing the first MTF data in the storage unit of the camera module, when pressure detection is required, the first MTF data can be directly retrieved from the storage unit of the camera module, facilitating rapid acquisition of the first MTF data. Of course, retrieving the first MTF data is not limited to retrieving it from the storage unit, and the storage unit does not necessarily have to store the first MTF data.

[0046] Specifically, the storage unit is EEPROM.

[0047] Specifically, the device is equipped with a driver interface for reading the storage unit, which facilitates the testing equipment to read the first MTF data in the storage unit through this driver interface. Furthermore, the testing equipment can read data from the storage unit via the adb command interface.

[0048] Specifically, after the first MTF data is obtained through testing, it is uploaded to the MES system, which then writes it into the storage unit. Because the first MTF data is uploaded to the MES system first, and then written into the storage unit by the MES system, it facilitates tracking and control.

[0049] In practice, the first MTF data is typically obtained through testing at the module manufacturer. Afterward, it is uploaded to the module manufacturer's MES system and then written to the storage unit. In addition to receiving the first MTF data, the module manufacturer's MES system also receives OTP data used for writing to the storage unit. The second MTF data is usually obtained at the OEM manufacturer through testing the complete machine.

[0050] 102. Calculate the difference between the first MTF data and the second MTF data to obtain a first difference value, and compare the first difference value with a first set threshold. Specifically, the first set threshold can be defined based on the difference between the MTE data when the camera module is assembled into the whole machine and when the camera module is not assembled, according to big data statistics.

[0051] Because the camera module's lens deforms under pressure from the entire device, the pressure on the front camera module generally refers to the pressure exerted by the rear casing of the device pressing against it. Lens deformation alters the lens surface shape and inter-lens spacing, which in turn changes the MTF (Mean Transmission Frequency) data. Therefore, detecting the change in MTF data can usually reflect the degree of pressure exerted on the camera module.

[0052] 103. Determine the pressure condition of the camera module based on the comparison results.

[0053] Please combine Figure 2 Specifically, the pressure condition of the camera module is determined based on the comparison results, including:

[0054] 104. If the first difference is less than or equal to the first set threshold, the camera module is considered to be under normal pressure (within the normal pressure range).

[0055] 105. If the first difference is greater than or equal to or greater than the first set threshold, the camera module is considered to be under abnormal pressure (exceeding the normal pressure range) and / or to be abnormal.

[0056] Please combine Figure 3 Furthermore, if the first difference is greater than or equal to or greater than a first preset threshold, the method further includes:

[0057] 106. Obtain the third MTF data of the camera module after the pressure structure on the camera module has been removed through testing.

[0058] 107. Calculate the difference between the first MTF data and the third MTF data to obtain the second difference value, and compare the second difference value with the second set threshold.

[0059] 108. If the second difference is less than or equal to the second set threshold, the camera module is considered to be under abnormal pressure, meaning there is additional compression from the pressure-applying structure, causing the camera module's SFR (Spatial Frequency Response) to attenuate, while the camera module itself is normal. In this case, structural analysis of the pressure-applying structure can be performed to find the cause. In the specific example, the pressure-applying structure is the back cover of the entire device. Of course, depending on the product, the pressure-applying structure can also be other structures; this is not limited here.

[0060] 109. If the second difference is greater than or equal to the second set threshold, it is considered that the camera module itself is abnormal, and the SFR of the camera module has changed. Then the cause of the abnormality can be investigated, such as variations in incoming materials, variations in the assembly process, or low lens sensitivity. Of course, if it is confirmed that the camera module itself is abnormal, there may also be abnormal pressure conditions, which can be confirmed based on relevant data analysis.

[0061] Furthermore, the second set threshold is equal to or less than the first set threshold. Generally speaking, when the camera module is assembled into the whole device, there will be compression (compression within the normal pressure range) under normal circumstances. This factor can be taken into account when setting the second set threshold, and it will be set to be less than the first set threshold. Of course, the second set threshold can also be set to be equal to the first set threshold.

[0062] This application obtains the first MTF data of the camera module when it is not assembled and the second MTF data after it is assembled into the whole machine, and compares the difference between the two with a first set threshold. Then, it can determine the pressure status of the camera module based on the comparison result, that is, whether the pressure is normal or there may be abnormal pressure, which helps to ensure the use effect of the camera module in the whole machine.

[0063] Example 2

[0064] Please combine Figure 4 and Figure 5 This application discloses a pressure detection device for a camera module, comprising:

[0065] The first acquisition module 201 is used to acquire first MTF data when the camera module is not assembled, and second MTF data after the camera module is assembled into the whole machine. The first MTF data and the second MTF data are respectively the MTF data obtained by testing when the camera module is in an unassembled state (single unit) and the MTF data obtained by testing when it is in an assembled state (assembled into the whole machine).

[0066] Specifically, the first MTF data is stored in the storage unit of the camera module.

[0067] Obtain the first MTF data when the camera module is not assembled, including:

[0068] Retrieve the first MTF data from the storage unit.

[0069] By storing the first MTF data in the storage unit of the camera module, the first MTF data is retrieved from the storage unit when pressure detection is required, facilitating rapid acquisition of the first MTF data. However, retrieving the first MTF data is not limited to retrieving it from the storage unit, and the storage unit does not necessarily have to store the first MTF data.

[0070] Specifically, the storage unit is EEPROM.

[0071] Specifically, the device is equipped with a driver interface for reading the storage unit, which facilitates the testing equipment to read the first MTF data in the storage unit through this driver interface. Furthermore, the testing equipment can read data from the storage unit via the adb command interface.

[0072] Specifically, after the first MTF data is obtained through testing, it is uploaded to the MES system, which then writes it into the storage unit. Because the first MTF data is uploaded to the MES system first, and then written into the storage unit by the MES system, it facilitates tracking and control.

[0073] In practice, the first MTF data is typically obtained through testing at the module manufacturer. Afterward, it is uploaded to the module manufacturer's MES system and then written to the storage unit. In addition to receiving the first MTF data, the module manufacturer's MES system also receives OTP data used for writing to the storage unit. The second MTF data is usually obtained at the OEM manufacturer through testing the complete machine.

[0074] The first difference comparison module 202 is used to calculate the difference between the first MTF data and the second MTF data to obtain a first difference value, and compare the first difference value with a first set threshold.

[0075] Specifically, the first set threshold can be defined based on the difference between the MTE data when the camera module is assembled into the whole machine and when the camera module is not assembled, according to big data statistics.

[0076] Because the camera module's lens deforms under pressure from the entire device, the pressure on the front camera module generally refers to the pressure exerted by the rear casing of the device pressing against it. Lens deformation alters the lens surface shape and inter-lens spacing, which in turn changes the MTF (Mean Transmission Frequency) data. Therefore, detecting the change in MTF data can usually reflect the degree of pressure exerted on the camera module.

[0077] The judgment module 203 is used to judge the pressure condition of the camera module based on the comparison result.

[0078] Specifically, if the first difference is less than or equal to the first set threshold, the camera module is considered to be under normal pressure (within the normal pressure range). If the first difference is greater than or equal to the first set threshold, the camera module is considered to be under abnormal pressure (exceeding the normal pressure range) and / or to be malfunctioning.

[0079] Furthermore, the device also includes:

[0080] The second acquisition module 204 is used to acquire the third MTF data of the camera module after the pressure structure on the camera module has been removed through testing if the first difference is greater than or equal to or greater than the first set threshold.

[0081] The second difference comparison module 205 is used to calculate the difference between the first MTF data and the third MTF data to obtain a second difference value, and compare the second difference value with a second set threshold.

[0082] If the second difference is less than or equal to the second set threshold, the camera module is considered to be under abnormal pressure, meaning that the pressure-applying structure is subject to additional compression, causing the camera module's SFR (Spatial Frequency Response) to attenuate, while the camera module itself is normal. In this case, structural analysis of the pressure-applying structure can be performed to find the cause. In the specific example, the pressure-applying structure is the back cover of the entire device. Of course, depending on the product, the pressure-applying structure can also be other structures; this is not a limitation.

[0083] If the second difference is greater than or equal to or greater than the second set threshold, it is considered that the camera module itself is abnormal, and the SFR of the camera module has changed. Then the cause of the abnormality can be investigated, such as variations in incoming materials, variations in the assembly process, or low lens sensitivity. Of course, even if it is confirmed that the camera module itself is abnormal, there may also be abnormalities due to pressure. This can be confirmed based on relevant data analysis.

[0084] Furthermore, the second set threshold is equal to or less than the first set threshold. Generally speaking, when the camera module is assembled into the whole device, there will be compression (compression within the normal pressure range) under normal circumstances. This factor can be taken into account when setting the second set threshold, and it will be set to be less than the first set threshold. Of course, the second set threshold can also be set to be equal to the first set threshold.

[0085] This application obtains the first MTF data of the camera module when it is not assembled and the second MTF data after it is assembled into the whole machine, and compares the difference between the two with a first set threshold. Then, it can determine the pressure status of the camera module based on the comparison result, that is, whether the pressure is normal or there may be abnormal pressure, which helps to ensure the use effect of the camera module in the whole machine.

[0086] Example 3

[0087] Please see Figure 6 This application discloses a testing device, comprising:

[0088] Processor 30;

[0089] Memory 40, which stores executable instructions of processor 30;

[0090] The processor 30 is configured to execute the camera module pressure detection method described above by executing executable instructions.

[0091] Example 4

[0092] This application discloses a computer-readable storage medium storing a program thereon, which, when executed by a processor, implements the pressure detection method for a camera module as described above.

[0093] Example 5

[0094] This application discloses a computer program product or computer program including computer instructions stored in a computer-readable storage medium. The processor of an electronic device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the electronic device to perform the pressure detection method for a camera module as described above.

[0095] It should be understood that, in the embodiments of this application, the processor may be a central processing unit (CPU), but it may also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0096] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by hardware related to computer program instructions. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0097] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0098] The above-disclosed examples are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall fall within the scope of this application.

Claims

1. A method for detecting pressure on a camera module, characterized in that, include: Obtain the first MTF data when the camera module is not assembled; Obtain the second MTF data of the camera module after it is assembled into the whole machine; The difference between the first MTF data and the second MTF data is calculated to obtain a first difference value, and the first difference value is compared with a first set threshold value; The pressure condition of the camera module is determined based on the comparison results.

2. The pressure detection method for a camera module according to claim 1, characterized in that, The first MTF data is stored in the storage unit of the camera module; The acquisition of the first MTF data when the camera module is not assembled includes: The first MTF data is obtained from the storage unit.

3. The pressure detection method for a camera module according to claim 2, characterized in that, The device is equipped with a drive interface for reading the storage unit.

4. The pressure detection method for a camera module according to claim 2, characterized in that, After the first MTF data is obtained through testing, it is uploaded to the MES system, and the MES system writes the first MTF data into the storage unit.

5. The pressure detection method for a camera module according to claim 1, characterized in that, The step of determining the pressure condition of the camera module based on the comparison results includes: If the first difference is less than or equal to the first set threshold, the camera module is considered to be under normal pressure. If the first difference is greater than or equal to or greater than the first set threshold, then the camera module is considered to be under abnormal pressure and / or itself is abnormal.

6. The pressure detection method for a camera module according to claim 5, characterized in that, If the first difference is greater than or equal to or greater than the first preset threshold, the method further includes: The third MTF data of the camera module was obtained by testing after the pressure structure on the camera module was removed. The difference between the first MTF data and the third MTF data is used to obtain a second difference value, and the second difference value is compared with a second set threshold value. If the second difference is less than or equal to the second set threshold, the camera module is considered to be under abnormal pressure. If the second difference is greater than or equal to or greater than the second set threshold, then the camera module itself is considered to be abnormal.

7. The pressure detection method for a camera module according to claim 6, characterized in that, The second set threshold is equal to or less than the first set threshold. 8.A camera module pressure detection device, characterized in that, Includes a module for performing the camera module pressure detection method as described in any one of claims 1 to 7.

9. A test apparatus, characterized by, include: processor; A memory in which executable instructions of the processor are stored; The processor is configured to execute the camera module pressure detection method according to any one of claims 1 to 7 by executing the executable instructions.

10. A computer-readable storage medium having stored thereon a program, characterized in that, When the program is executed by the processor, it implements the camera module pressure detection method as described in any one of claims 1 to 7.

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