A testing device and method for a camera module

Abstract

A kind of testing device and method of camera module, device includes upper cover adapter plate, test base and module test box.Upper cover adapter plate is equipped with accommodating hole and conductive contact block;The first contact part of conductive contact block is in contact with electrically connected ground conductive piece.Test base is equipped with accommodating site, conductive piece test probe and connector probe;Conductive piece test probe and the second contact part of conductive contact block form contact electrically connected;Connector probe includes first probe and second probe;First probe and the pin of connector electrically connected with ground conductive piece form contact electrically connected.Module test box is electrically connected with first probe and conductive piece test probe respectively, to measure the current flowing through ground conductive piece, determine the resistance of ground conductive piece;Also electrically connected with second probe, to test image detection information.Can realize image test and ground conductive piece resistance test, can effectively improve the efficiency of resistance test, suitable for full inspection, can ensure the comprehensiveness and accuracy of detection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of camera module testing, in particular to a camera module testing device and method. BACKGROUND

[0002] The grounding performance of a camera module directly affects the stability and safety of a circuit, signal quality, electromagnetic compatibility, and the overall reliability of a product. To avoid interference with other devices or radio frequency signals after the camera module is inserted into an electronic device (such as a mobile phone), a grounding conductive part (such as a steel sheet, copper foil, conductive sponge, conductive cloth, etc.) is usually arranged on the back of the connector position, and the resistance of the grounding conductive part is measured by a multimeter.

[0003] However, this method has certain drawbacks. On the one hand, the test efficiency of the multimeter is low, and it is difficult to achieve full inspection in practice, resulting in low comprehensiveness and accuracy of detection. On the other hand, the needle of the multimeter is easy to scratch the steel sheet, affecting the product quality and even making it impossible to ship. SUMMARY

[0004] To solve at least one problem in the prior art, the purpose of the present application is to provide a camera module testing device and method, which can realize image testing and grounding conductive part resistance testing, has high testing efficiency for grounding conductive part resistance, is suitable for full inspection, can ensure the comprehensiveness and accuracy of detection, and can effectively avoid scratching the grounding conductive part compared to manual testing by a multimeter, thereby helping to improve product quality and reduce costs.

[0005] To achieve the above purpose, the camera module testing device provided by the present application is applied to a camera module; the camera module includes a camera module main body and a connector electrically connected by an FPC; the front of the connector is provided with a plurality of pins, and the back of the connector is provided with a grounding conductive part; and the testing device includes:

[0006] The upper cover adapter plate is provided with a receiving hole and a conductive contact block; the receiving hole is a through hole opened in the upper cover adapter plate, used for accommodating the camera module main body and exposing the camera module lens; and the first contact part of the conductive contact block is arranged in position with the grounding conductive part to form a contact electrical connection;

[0007] The testing base is provided with a receiving position, a conductive part testing probe, and a plurality of connector probes; the receiving position is used for accommodating the FPC and the connector; the contact end of the conductive part testing probe is arranged in position with the second contact part of the conductive contact block to form a contact electrical connection; the connector probe includes a first probe for testing the resistance of the grounding conductive part and a second probe for testing image detection information; and the contact end of the first probe is arranged in position with the pin of the connector electrically connected to the grounding conductive part to form a contact electrical connection.

[0008] A module test box is electrically connected with the interface end of the first probe and the interface end of the conductive part test probe respectively, used for measuring the current flowing through the grounding conductive part, determining the resistance of the grounding conductive part based on the current value; the module test box is also electrically connected with the interface end of the second probe, used for testing the image detection information of the camera module.

[0009] Optionally, the test base is further provided with a voltage dividing resistor; the interface end of the conductive part test probe is electrically connected with the module test box through the voltage dividing resistor.

[0010] Optionally, the first contact part and the second contact part are connected through a wire.

[0011] Optionally, the conductive part test probe and the connector probe are configured as elastic probes.

[0012] Optionally, the lower surface of the first contact part of the conductive contact block is additionally provided with a conductive adhesive layer.

[0013] Optionally, the module test box is specifically used for:

[0014] obtaining the supply voltage and the test circuit resistance of a test circuit in which the first probe and the conductive part test probe are located;

[0015] measuring the current flowing through the grounding conductive part;

[0016] determining the resistance of the grounding conductive part according to the supply voltage, the test circuit resistance and the current.

[0017] Further optionally, the module test box is further used for:

[0018] measuring the current flowing through the grounding conductive part multiple times and taking the average value of the current;

[0019] using the average value of the current as the current value for determining the resistance.

[0020] Optionally, the module test box is further used for:

[0021] in response to the resistance being greater than or equal to a resistance threshold value, determining that the corresponding camera module is a grounding performance substandard module;

[0022] in response to the resistance being less than the resistance threshold value, determining that the corresponding camera module is a grounding performance qualified module.

[0023] Further optionally, the resistance threshold value is configured as 2Ω.

[0024] To achieve the above object, the application further provides a camera module testing method applied to the camera module testing device as described above, and the method comprises,

[0025] obtaining a power supply voltage and a testing circuit resistance of a testing circuit where the first probe and the conductive testing probe are located;

[0026] measuring a current flowing through the grounding conductive part;

[0027] determining a resistance of the grounding conductive part according to the power supply voltage, the testing circuit resistance and the current.

[0028] The camera module testing device and method of the application can realize the image detection information testing and the grounding conductive part resistance testing of the camera module simultaneously, thereby effectively improving the testing efficiency of the grounding conductive part resistance, being suitable for full testing, and ensuring the comprehensiveness and accuracy of the testing. Compared with the manual testing by the multimeter, the camera module testing device and method of the application can effectively avoid scratching the grounding conductive part, and help to improve the product quality and reduce the cost.

[0029] Other features and advantages of the application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, and together with the embodiments of the application, serve to explain the application, and do not constitute a limitation on the application. In the drawings:

[0031] Figure 1 is a sectional view of the camera module according to the embodiment of the application;

[0032] Figure 2 is a sectional view of the camera module in Figure 1 ;

[0033] Figure 3 is a bottom view of the camera module according to the embodiment of the application;

[0034] Figure 4 FIG. 6 is a sectional view of an upper cover adapter plate in FIG. 5; Figure 1

[0035] Figure 5 FIG. 7 is a sectional view of a test base in FIG. 6; Figure 1

[0036] Figure 6 FIG. 8 is a flowchart of a test method of a camera module according to an embodiment of the present application.

[0037] Wherein, it specifically includes the following reference signs:

[0038] A test device 100 of a camera module; an upper cover adapter plate 110; a containing hole 111; a conductive contact block 112; a first contact part 113; a second contact part 114; a test base 120; a containing position 121; a conductive part test probe 122; a connector probe 123; a voltage dividing resistor 124;

[0039] A camera module 200; a camera module main body 210; an FPC 220; a connector 230; a ground conductive part 240. DETAILED DESCRIPTION

[0040] Embodiments of the present application will be described in more detail by referring to the attached drawings. Although certain embodiments of the present application are shown in the drawings, it is understood that the present application can be implemented in various forms and should not be interpreted as being limited to the embodiments set forth herein, but rather these embodiments are provided so as to more completely and thoroughly understand the present application. It is understood that the drawings and embodiments of the present application are for exemplary purposes only and are not intended to limit the scope of protection of the present application.

[0041] The term "comprising" and variations thereof as used herein are used inclusively, i.e., "comprising but not limited to". The term "based on" is "based at least in part on". The term "one embodiment" means "at least one embodiment". The term "another embodiment" means "at least one additional embodiment". The term "some embodiments" means "at least some embodiments". Related definitions of other terms will be given in the description below.

[0042] It should be noted that the terms "first", "second", and the like used in the present application are merely used to distinguish different devices, modules, units, or data, and are not intended to limit the functions performed by these devices, modules, units, or data, or the mutual dependency therebetween.

[0043] It should be noted that the terms "one", "multiple" used in the present application are illustrative and not restrictive, and those skilled in the art should understand that, unless otherwise explicitly stated in the context, it should be understood as "one or more". "Multiple" should be understood as two or more.​​

[0044] Hereinafter, the embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0045] First of all, it needs to be pointed out that, as shown in the drawings, the testing device 100 of the camera module is applied to the camera module 200. The camera module 200 includes a camera module body 210, an FPC 220 and a connector 230. Among them, the camera module body 210 and the connector 230 are electrically connected by the FPC 220; the front of the connector 230 is provided with a plurality of pins, and the back is provided with a grounding conductive part 240. Figures 1-3

[0046] In a specific example, the camera module body 210 can include a lens, an image sensor and an image processing chip; the lens is oriented in the same direction as the back of the connector 230.

[0047] The testing device 100 of the camera module includes an upper cover adapter plate 110, a test base 120 and a module test box (not shown in the figure).

[0048] Among them, as shown in the drawings, the upper cover adapter plate 110 is provided with a containing hole 111 and a conductive contact block 112. Among them, the containing hole 111 is a through hole opened in the upper cover adapter plate 110, used for containing the camera module body 210 and exposing the lens of the camera module 200. The conductive contact block 112 includes a first contact part 113 and a second contact part 114. The first contact part 113 is arranged in position with the grounding conductive part 240 to form a contact electrical connection. Figure 1 Figure 4

[0049] In a specific embodiment, the first contact part 113 and the second contact part 114 can be connected by wires to improve the resistance of the test circuit, reduce the current by voltage division, and avoid the current value exceeding the upper limit of the tool.

[0050] As shown in the drawings, the test base 120 is provided with a containing position 121, a conductive part test probe 122 and a plurality of connector probes 123. Among them, the containing position 121 is used for containing the FPC 220 and the connector 230; the contact end of the conductive part test probe 122 is arranged in position with the second contact part 114 of the conductive contact block 112 to form a contact electrical connection. The connector probe 123 includes a first probe for testing the resistance of the grounding conductive part 240 and a second probe for testing the image detection information. The contact end of the first probe is arranged in position with the pin of the connector 230 electrically connected to the grounding conductive part 240 to form a contact electrical connection. Figure 1 Figure 5

[0051] In a specific embodiment, the conductive part test probe 122 and the connector probe 123 are preferably configured as elastic probes.​​​​​

[0052] It should be noted that probes (such as conductive component test probe 122 and connector probe 123) all include a contact end and an interface end. The contact end is the end of the probe that directly contacts the object under test (such as connector 230). The contact end is responsible for establishing an electrical connection to transmit test signals to or receive signals from the object under test. The shape and material of the contact end will vary depending on the type of object under test and the testing requirements; it can be pointed, rounded, claw-shaped, etc. The interface end is the part of the probe that connects to the testing equipment (such as a module test box). It is responsible for transmitting the signals received at the contact end to the testing equipment for processing and analysis, or transmitting the signals generated by the testing equipment to the contact end for output.

[0053] refer to Figure 1 As shown, the module test box is electrically connected to the interface end of the first probe and the interface end of the conductive component test probe 122, respectively, for measuring the current flowing through the grounding conductive component 240 and determining the resistance of the grounding conductive component 240 based on the current value; the module test box is also electrically connected to the interface end of the second probe for testing the image detection information of the camera module 200.

[0054] It should be noted that, in specific examples, image detection information may include at least one of the following: resolution test information, color reproduction test information, contrast and dynamic range test information, white balance test information, light sensitivity and low light performance test information, focus and sharpness test information, distortion and geometric distortion test information, glare and ghosting test information, and vignetting effect test information.

[0055] like Figures 1-5 As shown, when using the testing device 100 for this camera module, the camera module 200 is placed flat on the receiving position 121 of the test base 120 with the lens facing upwards, and the pins on the front of the connector 230 are aligned with the corresponding connector probes 123 on the test base 120. Then, the upper cover adapter plate 110 is placed on the test base 120, so that the receiving hole 111 accommodates the camera module body 210 and exposes the lens of the camera module 200, and the first contact portion 113 of the conductive contact block 112 is aligned and in contact with the grounding conductive element 240, while the second contact portion 114 of the conductive contact block 112 is aligned and in contact with the contact end of the conductive element test probe 122. In this way, a grounding conductive element resistance test circuit is formed, consisting of the module test box, the first probe, the connector 230, the grounding conductive element 240, the conductive contact block 112, and the conductive element test probe 122.

[0056] Then, the camera module 200 is lighted, and the module test box is used to supply power (e.g., VDD) to the grounding conductive member resistance test circuit, to turn on the grounding conductive member 240 and the GND (ground wire), to measure the current flowing through the grounding conductive member 240, and to determine the resistance of the grounding conductive member 240 based on the measured current value. In addition, the module test box is also used to perform image detection of the camera module 200 before or after the grounding conductive member resistance test.

[0057] Thus, by using the test device, the image detection information test and the grounding conductive member resistance test of the camera module 200 can be performed, so that the test efficiency of the resistance of the grounding conductive member 240 can be effectively improved, and the test device is suitable for full inspection, and can ensure the comprehensiveness and accuracy of the detection. In addition, compared with the manual test by using a multimeter, the grounding conductive member 240 can be effectively prevented from being scratched, and the product quality can be improved and the cost can be reduced.

[0058] In the embodiment of the present application, the lower surface of the first contact portion 113 of the conductive contact block 112 is preferably attached with a conductive adhesive layer. The conductive adhesive layer as the elastic material can form good contact with the grounding conductive member 240, and can help to improve the accuracy of the resistance test.

[0059] In the embodiment of the present application, as shown in Figure 5 The interface end of the conductive member test probe 122 is electrically connected to the module test box through the voltage dividing resistor 124, so as to reduce the current and avoid that the current value exceeds the upper limit of the tool.

[0060] In the embodiment of the present application, the module test box can be specifically used to: acquire the supply voltage of the test circuit in which the first probe and the conductive member test probe 122 are located and the resistance of the test circuit; measure the current flowing through the grounding conductive member 240; and determine the resistance of the grounding conductive member 240 according to the supply voltage, the resistance of the test circuit and the current.

[0061] The resistance of the test circuit is the self-resistance of the grounding conductive member resistance test circuit except the grounding conductive member 240.

[0062] In a specific example, the resistance of the grounding conductive member 240 can be determined by the following way:

[0063] Rg=(V / I-Rc)

[0064] The Rg is the resistance of the grounding conductive member; the V is the supply voltage of the test circuit; the I is the current flowing through the grounding conductive member; and the Rc is the resistance of the test circuit.

[0065] Furthermore, the module test box can also be used to: repeatedly measure the current flowing through the grounding conductor 240 and take the average current value; use the average current value as the current value to determine the resistance of the grounding conductor. This improves the accuracy of current measurement and the reliability of testing.

[0066] In this embodiment, the module test box is further configured to: determine that the corresponding camera module 200 has substandard grounding performance in response to a resistance greater than or equal to a resistance threshold; and determine that the corresponding camera module 200 has compliant grounding performance in response to a resistance less than the resistance threshold. In a specific example, the resistance threshold is configured to 2Ω. That is, it can further automatically determine and filter out modules with substandard and compliant grounding performance, thereby further improving the convenience of testing.

[0067] In summary, the camera module testing apparatus according to the embodiments of this application incorporates a receiving hole to house the camera module body and expose the camera module lens. A first contact portion of the conductive contact block forms an electrical connection with a grounding conductive component. An receiving position accommodates the FPC and connector. A conductive component test probe is electrically connected to the second contact portion of the conductive contact block, and a first probe is electrically connected to the pins of the connector electrically connected to the conductive contact block. The module test box is electrically connected to both the first probe and the conductive component test probe to measure the current flowing through the grounding conductive component. The resistance of the grounding conductive component is determined based on the current value. The module test box is also electrically connected to the second probe to test the image detection information of the camera module. Therefore, both image detection information testing and grounding conductive component resistance testing of the camera module can be performed simultaneously, effectively improving the testing efficiency of the grounding conductive component resistance. This apparatus is suitable for full inspection, ensuring comprehensiveness and accuracy of the testing. Furthermore, compared to manual testing with a multimeter, it effectively avoids scratching the grounding conductive component, contributing to improved product quality and reduced costs.

[0068] Figure 6 This is a flowchart of a test method for a camera module according to this specific embodiment. (Reference) Figure 6 As shown, the testing method for the camera module is applied to the testing apparatus for the camera module in the above embodiments, and includes the following steps:

[0069] Step 301: Obtain the power supply voltage and test circuit resistance of the test circuit where the first probe and the conductive component test probe are located.

[0070] Step 302: Measure the current flowing through the grounded conductive component.

[0071] Step 303: Determine the resistance of the grounding conductive component based on the power supply voltage, test circuit resistance, and current.

[0072] In the embodiments of the present application, the method can further include: measuring the current flowing through the grounding conductive member multiple times, and taking the average of the current; and using the average of the current as the current for determining the resistance.

[0073] In the embodiments of the present application, as shown in Figure 6 The method can further include the following steps:

[0074] In step 304, in response to the resistance being less than the resistance threshold, the corresponding camera module is determined to be a grounding performance qualified module.

[0075] In step 305, in response to the resistance being greater than or equal to the resistance threshold, the corresponding camera module is determined to be a grounding performance unqualified module.

[0076] It should be noted that the above-mentioned explanation and description of the test method of the camera module in the embodiments are also applicable to the test device of the camera module in the above-mentioned embodiments, which will not be described here.

[0077] It should be understood that, although each step in the flowchart of the drawings is shown in sequence according to the arrow, these steps are not necessarily executed in sequence according to the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other sequences. Moreover, at least part of the steps in the flowchart can include multiple sub-steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of these sub-steps or stages is not necessarily sequential, but can be executed in rotation or alternation with other steps or sub-steps or stages of other steps.

[0078] It should be noted that the specific numerical values mentioned above are only used as examples to illustrate the embodiments of the present application, and should not be understood as limiting the present application. In other examples or embodiments or examples, other numerical values can be selected according to the present application, which are not specifically limited herein.

[0079] Those skilled in the art can understand that the above are only preferred embodiments of the present application, and are not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, and those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A testing device of a camera module, characterized in that, Be applied to camera module The camera module includes a camera module body and a connector connected by an FPC; The front of the connector is provided with a plurality of pins, and the back is provided with a grounding conductive part; The testing device comprises: The upper cover adapter plate is provided with a receiving hole and a conductive contact block; wherein the receiving hole is a through hole opened in the upper cover adapter plate, used for accommodating the camera module body and exposing the camera module lens; The first contact part of the conductive contact block is arranged in position with the grounding conductive part to form a contact electrical connection; The test base is provided with a receiving position, a conductive part test probe and a plurality of connector probes; wherein the receiving position is used for accommodating the FPC and the connector; The contact end of the conductive part test probe is arranged in position with the second contact part of the conductive contact block to form a contact electrical connection; The second contact part is connected with the first contact part through a wire; The connector probe includes a first probe for testing the resistance of the grounding conductive part and a second probe for testing the image detection information; The contact end of the first probe is arranged in position with the pin of the connector electrically connected with the grounding conductive part to form a contact electrical connection; The module test box is electrically connected with the interface end of the first probe and the interface end of the conductive part test probe respectively, used for measuring the current flowing through the grounding conductive part, and determining the resistance of the grounding conductive part based on the current value; The module test box is also electrically connected with the interface end of the second probe, used for testing the image detection information of the camera module.

2. The test device of claim 1, wherein, The test base is also provided with a voltage dividing resistor; The interface end of the conductive part test probe is electrically connected with the module test box through the voltage dividing resistor.

3. The test device of claim 1, wherein, The conductive part test probe and the connector probe are configured as elastic probes.

4. The test device of claim 1, wherein, The lower surface of the first contact part of the conductive contact block is attached with a conductive adhesive layer.

5. The test device of claim 1, wherein, The module test box is specifically used for: Obtaining the supply voltage and test circuit resistance of the test circuit in which the first probe and the conductive part test probe are located; Measuring the current flowing through the grounding conductive part; According to the supply voltage, the test circuit resistance and the current, the resistance of the grounding conductive part is determined.

6. The test device of claim 5, wherein, The module test box is also used for: Measuring the current flowing through the grounding conductive part multiple times and taking the average value of the current; The average value of the current is used as the current value for determining the resistance.

7. The test device of claim 5, wherein, The module test box is also used for: In response to the resistance being greater than or equal to a resistance threshold value, determining that the corresponding camera module is a grounding performance substandard module; In response to the resistance being less than the resistance threshold value, determining that the corresponding camera module is a grounding performance qualified module.

8. The test device of claim 7, wherein, The resistance threshold value is configured as 2Ω. 9.A method for testing a camera module, the method comprising: The testing device applied to the camera module of any one of claims 1-8, the method comprises: Obtaining the supply voltage and test circuit resistance of the test circuit in which the first probe and the conductive part test probe are located; Measuring the current flowing through the grounding conductive part; According to the supply voltage, the test circuit resistance and the current, the resistance of the grounding conductive part is determined.

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