Device, method and tool for testing grounding resistance of copper foil and steel sheet

Abstract

The invention discloses a copper foil and steel sheet grounding resistance testing device, method and tool, the testing device is applied to a camera module, the camera module comprises a circuit board, the circuit board comprises a module circuit board, a main circuit board, a copper foil and a steel sheet, the copper foil is electrically connected with the steel sheet through the module circuit board, and the main circuit board is electrically connected with the main circuit board. The testing device comprises a connector, a switching device, a tool connector and a testing tool, wherein the testing tool is connected with the tool connector; the tool connector is electrically connected with the steel sheet through the main circuit board, a switching device is arranged on the main circuit board, the tool connector is further connected with the connector through the switching device, and the connector is further electrically connected with the copper foil through the module circuit board; when the switching device is in an open state, current flowing out of the copper foil flows back to the test tool through the module circuit board and the steel sheet. The device can accurately test the grounding resistance between the copper foil and the steel sheet.

Description

Technical Field

[0001] The present invention relates to the field of video testing technology, and in particular to a testing device, method and testing tool for grounding resistance between copper foil and steel sheet. Background Art

[0002] In the production process of camera modules, the resistance of the camera modules needs to be tested to control the resistance and select good and bad products. The existing resistance test method between the copper foil and the steel sheet on the circuit board in the camera module has a mixed test result of the resistance between the connector ground and the copper foil and the resistance between the steel sheet and the copper foil. In this way, the resistance between the steel sheet and the copper foil grounding cannot be accurately measured, and the customer's requirements for testing the grounding resistance between the copper foil and the steel sheet cannot be met, and thus the camera module cannot be guaranteed to have good anti-static properties. Summary of the invention

[0003] The embodiment of the present application provides a testing device, method and testing tool for the grounding resistance between copper foil and steel sheet. The device can accurately test the grounding resistance between copper foil and steel sheet, which is beneficial for accurately testing whether the contact between the motor iron shell and the copper foil in the module is good, and determining whether the module has a good anti-static effect.

[0004] In a first aspect, the present invention provides the following technical solution through an embodiment of the present invention:

[0005] A test device for the grounding resistance between copper foil and steel sheet is applied to a camera module. The camera module comprises: a circuit board, the circuit board comprises a module circuit board, a main circuit board, copper foil and a steel sheet, the copper foil is electrically connected to the steel sheet through the module circuit board, the test device comprises: a connector, a switch device, a tooling connector and a test tooling, the test tooling is connected to the tooling connector; the tooling connector is electrically connected to the steel sheet through the main circuit board, the main circuit board is provided with the switch device, the tooling connector is also connected to the connector through the switch device, and the connector is also electrically connected to the copper foil through the module circuit board; when the switch device is in an open state, the current flowing out of the copper foil passes through the module circuit board and the steel sheet and flows back to the test tooling to measure the grounding resistance between the copper foil and the steel sheet.

[0006] Preferably, the switching device is a relay.

[0007] Preferably, the testing device also includes: a transistor and a control element; the enable end of the tooling connector is connected to the gate of the transistor, the base of the transistor is connected to one end of the control element, the emitter of the transistor is grounded, and the other end of the control element is connected to the control end of the switching device.

[0008] Preferably, the testing device further comprises: a pull-down resistor, one end of the pull-down resistor is connected to the enabling end of the tooling connector, and the other end is grounded.

[0009] Preferably, the control element is a magnetic member.

[0010] Preferably, the testing tool comprises: a tool and a tester, the tester is connected to the tool, and the tool is connected to the switch device via the tool connector.

[0011] Preferably, the switching device is a transistor.

[0012] In a second aspect, the present invention provides the following technical solution through an embodiment of the present invention:

[0013] A method for testing the grounding resistance between copper foil and steel sheet is applied to the test device described in any one of the first aspects above, and the method includes: determining the working mode of the camera module according to a preset control rule, wherein the working mode includes a normal working mode and an impedance test mode; based on the working mode, inputting a high level or low level signal to the test tooling.

[0014] Preferably, based on the working mode, a high level or low level signal is input to the tooling connector, including: when the working mode is the normal working mode, a high level signal is input to the enable end of the tooling connector, so that the transistor is turned on, the control element is powered, and the switch device is in a closed state; when the working mode is the impedance test mode, a low level signal is input to the enable end of the tooling connector, so that the transistor is turned off, the control element is powered off, and the switch device is in an open state.

[0015] In a third aspect, the present invention provides the following technical solution through an embodiment of the present invention:

[0016] A test tool comprises: a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of any one of the methods described in the second aspect are implemented.

[0017] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0018] The test device provided by the embodiment of the present invention can control the opening and closing of the switch device by adding a switch device between the tooling connector and the connector. When a resistance test is required, the switch device is controlled to be in an off state, and the current can only flow from the copper foil to the steel sheet and back to the test tooling. The current between the connector and the copper foil cannot flow to the test tooling, thereby accurately testing the grounding resistance between the copper foil and the steel sheet to ensure that the copper foil and the steel sheet are in a connected state. Since the resistance of the steel sheet is fixed, the resistance of the copper foil is a variable. According to the resistance between the steel sheet and the copper foil, it can be reflected whether the copper foil is in good contact, which is conducive to accurately testing whether the contact between the motor iron shell and the copper foil in the module is good, and determining whether the motor shell is well grounded, so that the module has a better anti-static effect. The present application achieves more accurate measurement at a lower improvement cost through simple structural improvements. Good and bad products in the camera module can be screened out according to the resistance value, and the module is adjusted according to the measured resistance value to improve the anti-static effect of the module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic diagram of the structure of a camera module and a testing device provided in an embodiment of the present invention;

[0021] Figure 2a A pin diagram of a female socket provided in an embodiment of the present invention;

[0022] Figure 2b A pin diagram of a tooling connector provided in an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the structure of the connection between the tooling connector and the switch device provided in an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of a resistance test between a copper foil and a steel sheet provided in an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the structure of a method for testing the grounding resistance between copper foil and steel sheet provided in an embodiment of the present invention;

[0026] Figure 6 A schematic diagram of the structure of a test tool provided in an embodiment of the present invention.

[0027] Figure Number:

[0028] 101-copper foil; 102-steel sheet; 103-connector; 104-switch device; 105-tool connector; 115-tester; 106-test tool; 107-motor iron shell; 108-metal adapter plate; 109-male socket; 110-female socket; 111-copper base; 112-test circuit board; 113-module circuit board; 114-main circuit board. DETAILED DESCRIPTION

[0029] The embodiment of the present application provides a testing device, method and testing tool for the grounding resistance between copper foil and steel sheet. The device can accurately test the grounding resistance between copper foil and steel sheet, which is beneficial for accurately testing whether the contact between the motor iron shell and the copper foil in the module is good, and determining whether the module has a good anti-static effect.

[0030] The overall idea of ​​the technical solution of the embodiment of the present application is as follows:

[0031] A test device for the grounding resistance of copper foil and steel sheet comprises: applied in a camera module, the camera module comprises: a circuit board, the circuit board comprises a module circuit board, a main circuit board, copper foil and a steel sheet, the copper foil is electrically connected to the steel sheet through the module circuit board, the test device comprises: a connector, a switch device, a tooling connector and a test tooling, the test tooling is connected to the tooling connector; the tooling connector is electrically connected to the steel sheet through the main circuit board, the main circuit board is provided with a switch device, the tooling connector is also connected to the connector through the switch device, and the connector is also electrically connected to the copper foil through the module circuit board; when the switch device is in an open state, the current flowing out of the copper foil flows back to the test tooling through the steel sheet to measure the grounding resistance between the copper foil and the steel sheet.

[0032] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] In a first aspect, a copper foil and steel sheet grounding resistance test device provided by an embodiment of the present invention is applied to a camera module, such as Figure 1 As shown, the camera module includes: a circuit board, the circuit board includes a module circuit board 113, a main circuit board 114, a copper foil 101 and a steel sheet 102, the copper foil 101 is electrically connected to the steel sheet 102 through the module circuit board 113, and the test device includes: a connector 103, a switch device 104, a tooling connector 105 and a test tooling 106, and the test tooling 106 is connected to the tooling connector 105.

[0034] The tooling connector 105 is electrically connected to the steel sheet 102 through the main circuit board 114 , on which the switch device 104 is provided. The tooling connector 105 is also connected to the connector 103 through the switch device 104 , and the connector 103 is also electrically connected to the copper foil 101 through the module circuit board 113 .

[0035] When the switch device 104 is in the open state, the tooling connector 105 is disconnected from the connector 103, and the current flowing out of the copper foil 101 flows back to the test tooling 106 through the module circuit board 113, the steel sheet 102, the main circuit board 114, and the tooling connector 105 to measure the grounding resistance between the copper foil 101 and the steel sheet 102.

[0036] When the switch device 104 is in a closed state, the tooling connector 105 is electrically connected to the connector 103, and part of the current flowing out from the copper foil 101 flows back to the test tooling 106 through the module circuit board 113, the steel sheet 102, the main circuit board 114, and the tooling connector 105, and the other part of the current flows back to the test tooling 106 through the module circuit board 113, the connector 103, the switch device 104, the main circuit board 114, and the tooling connector 105.

[0037] In order to facilitate the understanding of the present solution, the specific structure of the camera module indicated in the present application is described in detail below. The camera module also includes: a main circuit board 114, a male socket 109, and a motor iron shell 107. The test device also includes: a female socket 110, a test circuit board 112, a test resistor R3 and a metal adapter plate 108.

[0038] Among them, the copper foil 101 is set on the main circuit board 114 through the copper base 111, the copper foil 101 is electrically connected to the steel sheet 102 through the module circuit board 113, the steel sheet 102 is set on the side of the module circuit board 113 extending out of the motor iron shell 107, and is set below the module circuit board 113, the steel sheet 102 is set on the main circuit board 114 through the copper base 111, the motor iron shell 107 is connected to the copper foil 101, the male socket 109 is set on the module circuit board 113, one end of the female socket 110 is electrically connected to the male socket 109, and the female socket 110 is structurally compatible with the male socket 109, the other end of the female socket 110 is connected to the test circuit board 112, the test circuit board 112 is also connected to one end of the connector 103 (pogopin), and the other end of the connector 103 is electrically connected to the switch device 104. The steel sheet 102 is also electrically connected to the tooling connector 105 via the copper base 111 and the main circuit board 114 .

[0039] One end of the test resistor R3 is electrically connected to the tooling connector 105, and the other end of the test resistor R3 is electrically connected to the metal adapter plate 108, and the metal adapter plate 108 is also mechanically connected to the motor iron shell 107. The metal adapter plate 108 can be a copper manhole cover.

[0040] In the present application, the connection relationship between the test device and the camera module is as follows: the copper foil 101 is connected to the female socket 110 through the male socket 109 on the module circuit board 113, the female socket 110 is connected to the connector 103 through the test circuit board 112, and the connector 103 is connected to the tooling connector 105 through the switch device 104, that is, Figure 1 and the copper foil 101 is connected to the steel sheet 102 through the module circuit board 113, and the steel sheet 102 is connected to the tooling connector 105 through the copper base 111 and the main circuit board 114, that is, Figure 1 The current flow in the steel sheet is shown in .

[0041] The tooling connector 105 is connected to the test tooling 106 . The tooling connector 105 is also connected to the copper manhole cover through the test resistor R3 . The copper manhole cover is connected to the motor iron shell 107 . The motor iron shell 107 is connected to the copper foil 101 .

[0042] like Figure 2a As shown, J5 is the pin diagram of the female socket 110, as shown Figure 2b As shown, H1 is a pin diagram of the tooling connector 105 , and in the present application, the pins of the test tooling 106 include an enable terminal ( P01 ).

[0043] Preferably, the test fixture may include: a test fixture 106 and a tester 115, the tester 115 is connected to the test fixture 106, and the test fixture 106 is connected to the switch device 104 through the fixture connector 105. Specifically, the tester 115 may be a personal computer (PC), the test fixture 106 is connected to the PC through a USB interface, the working mode of the camera module is determined by the PC, and the test fixture 106 is controlled based on the working mode, so that the test fixture 106 outputs a high level or low level signal to the fixture connector 105 based on the control signal, thereby controlling the switch device 104 to open and close.

[0044] Specifically, the switch device 104 may be a relay, such as Figure 3 As shown, the test device may further include: a transistor Q1 and a control element K1, the enable end of the tooling connector 105 is connected to the gate of the transistor Q1, the base of the transistor Q1 is connected to one end of the control element K1, the emitter of the transistor Q1 is grounded, and the other end of the control element K1 is connected to the control end of the switch device 104. For example, the control element K1 may be a magnetic component, that is, an energized solenoid (coil).

[0045] When the working mode of the camera module is the normal working mode, a high-level signal is input to the enable terminal (EN) of the test fixture 106, so that the transistor Q1 is turned on, the coil is energized, and the switch device 104 is in a closed state; when the working mode of the camera module is the impedance test mode, a low-level signal is input to the enable terminal of the test fixture 106, so that the transistor Q1 is turned off, the coil is de-energized, and the switch device 104 is in an open state.

[0046] The transistor Q1 in the present application may be an NPN transistor Q1, such as Figure 3 As shown, when EN is at a high level, the NPN transistor Q1 is turned on, so that the switch device 104 is closed, and DGND1 and DGND are connected; when EN is at a low level, the NPN transistor Q1 is turned off, so that the switch device 104 is opened, and DGND1 and DGND are not connected.

[0047] Furthermore, the testing device may further include: a pull-down resistor R1, one end of the pull-down resistor R1 is connected to the enable end of the tooling connector 105, and the other end is grounded. For example, the resistance of the pull-down resistor R1 in the present application is 10K.

[0048] Of course, as another optional embodiment, the switch device 104 may also be a transistor or other device. In the present application, the models of the relay and the transistor Q1 are not limited.

[0049] Therefore, the present application adds a switch device 104 between the connector 103 and the test device. When the camera module works normally, the switch device 104 is in a closed state, so that the camera module is normally lit and works. When an impedance test is required, the switch device 104 is controlled to be in an open state through the test fixture 106, so that the test current does not pass through the connector 103, but only flows back to the test device through the steel sheet 102, so that the resistance between the steel sheet 102 and the copper foil 101 grounding can be accurately measured. The device can accurately measure the grounding resistance between the steel sheet 102 and the copper foil 101 without increasing the test station.

[0050] like Figure 4 As shown, TP1 and TP2 are both copper foil impedance test points, the test resistor R3 is a fixed resistor, that is, 47 ohms in this application, and the voltage across R3 is the test voltage VPP. 铜箔 is the copper foil grounding resistance, R 钢片 is the steel sheet grounding resistance, Rtotal=R3+R 铜箔 +R 钢片 .

[0051] Based on VPP / Rtotal=I, the current value can be calculated to determine R 铜箔 The resistance value of R3 and R 钢片The resistance value of R is also fixed, and the current value I will change with R 铜箔 By limiting the range of current value I, when the current value I exceeds the range, it indicates that R 铜箔 The resistance value is relatively large. Based on this method, it can be tested whether the contact between the copper foil 101 and the motor iron shell 107 is good.

[0052] Furthermore, after the current value is determined, the resistance value between the copper foil and the steel sheet can also be determined based on VPP / Rtotal=I.

[0053] In summary, the present application adds a switch device between the fixture connector and the connector, and the test fixture can control the opening and closing of the switch device. When a resistance test is required, when the switch device is controlled to be in an off state, the current can only flow from the copper foil to the steel sheet and back to the test fixture, and the current between the connector and the copper foil cannot flow to the test fixture, thereby more accurately testing the grounding resistance between the copper foil and the steel sheet. Through simple structural improvements, more accurate measurements can be achieved at a lower improvement cost, and the application range is wide.

[0054] In the second aspect, based on the same inventive concept, this embodiment provides a method for testing the grounding resistance between copper foil and steel sheet, such as Figure 5 As shown, the method includes the following steps S101 to S102:

[0055] Step S101, determining a working mode of the camera module according to a preset control rule, wherein the working mode includes a normal working mode and an impedance test mode;

[0056] Step S102: Based on the working mode, a high level or low level signal is input to the tooling connector.

[0057] In the specific implementation process, the test tool includes a preset control rule, according to which the working mode of the current camera module can be determined. Specifically, the preset control rule can be: a normal working mode is performed in a first preset time period, and an impedance test mode is performed in a second preset time period. The first preset time period and the second preset time period can be set as needed.

[0058] It should be noted that the specific implementation process of step S101 to step S102 can refer to the corresponding description in the above device embodiment, and will not be repeated here.

[0059] As an optional embodiment, based on the working mode, inputting a high level or low level signal to the tooling connector includes:

[0060] When the working mode is the normal working mode, a high-level signal is input to the enable end of the tooling connector, so that the transistor is turned on, the control element is powered, and the switch device is in a closed state; when the working mode is the impedance test mode, a low-level signal is input to the enable end of the tooling connector, so that the transistor is turned off, the control element is powered off, and the switch device is in an open state.

[0061] The embodiment of the present invention provides a method for testing the grounding resistance between copper foil and steel sheet. Its implementation principle and technical effects are the same as those of the aforementioned device embodiment. For the sake of brief description, for matters not mentioned in the device embodiment, reference can be made to the corresponding contents in the aforementioned device embodiment.

[0062] In a third aspect, based on the same inventive concept, this embodiment provides a test tool 500, such as Figure 6 As shown, it includes: a memory 501, a processor 502 and a computer program 503 stored in the memory and executable on the processor. When the processor 501 executes the program, the steps of the method for testing the grounding resistance of the copper foil and the steel sheet described in the second aspect are implemented.

[0063] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0064] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A test device for the grounding resistance of copper foil and steel sheet, characterized in that: Applied in a camera module, the camera module comprises: a circuit board, the circuit board comprises a module circuit board, a main circuit board, a copper foil and a steel sheet, the copper foil is electrically connected to the steel sheet through the module circuit board, the test device comprises: a connector, a switch device, a tooling connector and a test tooling, the test tooling is connected to the tooling connector; The tooling connector is electrically connected to the steel sheet through the main circuit board, the switch device is provided on the main circuit board, the tooling connector is also connected to the connector through the switch device, and the connector is also electrically connected to the copper foil through the module circuit board; When the switch device is in an open state, the current flowing out of the copper foil flows back to the test fixture through the module circuit board and the steel sheet to measure the grounding resistance between the copper foil and the steel sheet.

2. The testing device according to claim 1, characterized in that: The switch device is a relay.

3. The testing device according to claim 1, characterized in that: Also includes: Transistors and control components; The enabling end of the tooling connector is connected to the gate of the transistor, the base of the transistor is connected to one end of the control element, the emitter of the transistor is grounded, and the other end of the control element is connected to the control end of the switch device.

4. The testing device according to claim 3, characterized in that: Also includes: A pull-down resistor, one end of which is connected to the enabling end of the tooling connector, and the other end is grounded.

5. The testing device according to claim 3, characterized in that: The control element is a magnetic member.

6. The testing device according to claim 1, characterized in that: The testing tool comprises: a tool and a tester, the tester is connected to the tool, and the tool is connected to the switch device via the tool connector.

7. The testing device according to claim 1, characterized in that: The switching device is a transistor.

8. A method for testing the grounding resistance of copper foil and steel sheet, characterized in that: Applied to the testing device according to any one of claims 1 to 7, the method comprises: Determine the working mode of the camera module according to the preset control rules, wherein the working mode includes a normal working mode and an impedance test mode; Based on the working mode, a high level or a low level signal is input to the tooling connector.

9. The method according to claim 8, characterized in that The step of inputting a high level or a low level signal to the tooling connector based on the working mode includes: When the working mode is the normal working mode, a high level signal is input to the enable end of the tooling connector, so that the transistor is turned on, the control element is powered, and the switch device is in a closed state; When the working mode is the impedance test mode, a low level signal is input to the enable end of the tooling connector, so that the transistor is turned off, the control element loses power, and the switch device is in an open state.

10. A test tool, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the method according to any one of claims 8 to 9 are implemented.

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