Flat fpc cable testing method and device for ct detector
By using a double-pole double-throw switch and a closed-loop detection circuit for odd and even pin partitions built with purely passive hardware in the CT detector, the problems of complex and high cost of FPC cable testing are solved, and simplified operation and efficient testing are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SAINUO WEISHENG SCI & TECH BEIJING
- Filing Date
- 2026-04-30
- Publication Date
- 2026-06-12
AI Technical Summary
Testing the FPC cabling used in CT equipment is complex and costly. Existing test circuits require MCUs/industrial control computers, resulting in long development cycles and complex operation procedures.
The system uses a double-pole double-throw switch built with pure passive hardware, combined with an independent closed-loop detection circuit for odd and even pins. By switching the potential twice in both directions, the corresponding LED is lit up, which can quickly detect open circuits in the ribbon cable pins and short circuits in adjacent solder joints, thus eliminating the need for complex main control architectures such as MCUs and industrial PCs.
It simplifies the circuit structure, reduces hardware costs, is easy to operate, and enables rapid testing. It is suitable for full inspection in mass production on workshop assembly lines, thus improving testing efficiency.
Smart Images
Figure CN122193995A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of ribbon cable testing technology, specifically to a testing and apparatus for flat FPC ribbon cables used in CT detectors. Background Technology
[0002] In related technologies, CT equipment uses a large number of FPC cables. Due to the large number of cables and the small and dense pins of each cable, welding machines are prone to short circuits and open circuits during production. In the past, test circuits required MCUs / industrial control computers, which resulted in long development cycles, high costs, and complex testing procedures. Summary of the Invention
[0003] The main objective of this invention is to provide a testing method for flat FPC cables used in CT detectors, in order to address the shortcomings of related technologies.
[0004] To achieve the above objectives, according to a first aspect of the present invention, a testing method for a flat FPC cable for a CT detector is provided. The method includes defining the two ends of the target flat FPC cable as a matching plug-in end and a rear-end plug-in end, respectively. The matching plug-in end of the target flat FPC cable is aligned and inserted into a preset A-fixture plug-in socket, and the rear-end plug-in end is simultaneously aligned and inserted into a preset B-fixture plug-in socket. Specifically, fixed A-fixture plug-in sockets and fixed B-fixture plug-in sockets matching the standard interface specifications of the CT detector FPC are pre-welded to the surface of a fixture plate. Simultaneously, a double-pole double-throw bidirectional reversing switch, a first LED visual indicator light, and a second LED visual indicator light are integrated and welded to preset circuit points on the fixture plate. Two independent insulation closed-loop detection circuits are connected according to closed-loop insulation wiring specifications. A first unidirectional circuit conduction defect verification and a reverse reversing circuit cross-electrical verification are performed respectively. Based on the verification results, the quality level of the target flat FPC cable is determined.
[0005] Optionally, the first unidirectional circuit continuity defect verification includes: forward adjustment of the double-pole double-throw bidirectional reversing switch to the low-position closed conduction position; relying on the built-in wiring link of the tooling circuit, synchronously triggering the circuit linkage adaptation action to achieve precise connection of the No. 1 core detection pin inside the A tooling connector to the VCC power supply potential, and synchronously linking the No. 2 reference detection pin inside the A tooling connector to the common ground potential; relying on the preset series closed-loop wiring logic, a complete forward conduction detection current loop is formed, and the current flows sequentially through the No. 1 core detection pin of the A tooling connector and the pin to be connected. The FPC cable is inspected for its odd-numbered sequence full-function measurement and control pin array and the B-tool connector's matching linkage adapter pin array. Finally, the directional return current drives the first LED visual indicator light to match the power-on and standby light. If the first LED visual indicator light is normally and stably lit, and the second LED visual indicator light is completely off during the power-off process, it is determined that there is no open circuit fault in the forward single-sided circuit and no short circuit coupling interference between adjacent pins. If the first LED visual indicator light cannot be lit normally, it is directly determined that there is a soldering open circuit defect in the odd-numbered sequence pin range of the cable under test, or there is a short circuit electrical abnormality between adjacent measurement and control pins.
[0006] Optionally, performing reverse commutation circuit cross-electrical verification includes: reversely adjusting the double-pole double-throw bidirectional commutation switch to the high-position closed conduction position, relying on the synchronous commutation wiring logic of the tooling circuit, quickly switching the point potential adaptation state, realizing the switching of the No. 1 core detection pin inside the A tooling connector to the common ground potential, and synchronously linking the No. 2 reference detection pin inside the A tooling connector to the VCC power supply potential; synchronously constructing an independent reverse closed-loop detection current loop, with the loop current flowing sequentially through the No. 2 reference detection pin of the A tooling connector and the F to be tested. The PC cable corresponds to the even-numbered sequence full-function measurement and control pin array, and the B-tool connector is equipped with a linkage adapter pin array to drive the second LED visual indicator light to power on and wait for triggering to light up; if the second LED visual indicator light is normally and stably lit, and the first LED visual indicator light is completely powered off and turned off, the reverse verification circuit conduction performance is compliant and there is no short circuit crosstalk between the pins in the cross-section; if the second LED visual indicator light cannot be lit normally, it is determined that there is a soldering open circuit fault in the even-numbered sequence pin section of the cable under test, or there is a continuous short circuit electrical failure problem in any adjacent measurement and control pins in the entire area.
[0007] Optionally, the quality grade of the target flat FPC cable is determined based on the verification results as follows: only when the first LED and the second LED alternately and independently light up during the entire process of switching between the low and high positions of the double-pole double-throw switch, without simultaneous lighting, without all LEDs going out, and without abnormal flickering fluctuations, is the CT detector flat FPC cable judged to have compliant pin soldering continuity, no open circuits, and no short circuits between adjacent pins, and is calibrated as a qualified finished product cable; all others are calibrated as defective cables.
[0008] Optionally, both the A-tool connector and the B-tool connector adopt anti-offset locking FPC special surface mount connectors. The pin spacing of the terminals matches the standard pin layout of the mass-produced flat FPC ribbon cables for CT detectors. They are compatible with 8-bit, 12-bit, and 16-bit multi-gradient ribbon cable adapters for connection.
[0009] According to a second aspect of the present invention, a testing device for a flat FPC cable for a CT detector is provided, comprising a fixture main body, a dual-channel FPC docking assembly, a bidirectional potential reversing switch assembly, a dual-channel LED audible and visual prompt assembly, and a closed-loop wiring circuit for odd and even pin partitions; the dual-channel FPC docking assembly is fixedly bonded to the surface of the fixture main body, and includes a fixture A connector and a fixture B connector, which are aligned and coaxially arranged, with their pin arrays corresponding one-to-one, for coaxially locking the male and female docking ends of the flat FPC cable for the CT detector under inspection, achieving non-destructive closed-loop connection and conduction of the entire pin domain of the cable; the bidirectional potential reversing switch assembly is fixedly assembled in the fixture main body, and adopts a double-pole double-throw passive toggle switch, with the double poles synchronously switching the potential polarity of the entire circuit, and the switch is set to a high-level grounding reversing position. The low-position power supply reversing gear has two limit fixed gears; the dual-channel LED sound and light prompt component includes a first LED indicator and a second LED indicator. The two indicator lights are connected in series to the odd-numbered pin closed-loop wiring circuit and the even-numbered pin closed-loop wiring circuit, respectively, and illuminate independently in separate zones; the odd-even pin zone closed-loop wiring circuit is directly etched and integrated into the inside of the fixture motherboard, and is divided into two sets of independent insulated circuits: an odd-numbered pin detection circuit and an even-numbered pin detection circuit; the odd-numbered pin detection circuit is connected in series with the odd-numbered pins of fixture A and fixture B and the first LED indicator; the even-numbered pin detection circuit is connected in series with the even-numbered pins of fixture A and fixture B and the second LED indicator; the two circuits are synchronously controlled by a double-pole double-throw bidirectional potential reversing switch, and are switched in time-sharing between the VCC power supply terminal and the common ground terminal.
[0010] Optionally, both the A-tool connector and the B-tool connector are equipped with an elastic snap-locking structure, which automatically locks the cable end after insertion.
[0011] This embodiment describes a testing method and apparatus for flat FPC cables used in CT detectors. The method includes defining the two ends of the target flat FPC cable as a matching connector and a rear connector, respectively. The matching connector is inserted into a pre-set A-fixture connector, and the rear connector is simultaneously inserted into a pre-set B-fixture connector. Fixed A-fixture connectors and fixed B-fixture connectors, matching the standard interface specifications of the CT detector FPC, are pre-welded to the surface of a fixture plate. A double-pole double-throw bidirectional reversing switch, a first LED visual indicator, and a second LED visual indicator are simultaneously integrated and welded to pre-set circuit points on the fixture plate. Two independent insulation closed-loop detection circuits are connected according to closed-loop insulation wiring specifications. A first unidirectional circuit continuity defect verification and a reverse reversing circuit cross-electrical verification are performed. The quality level of the target flat FPC cable is determined based on the verification results. Abandoning the complex main control architecture of MCU and industrial PC, this system uses pure passive hardware to build a double-pole double-throw switch with an independent closed-loop detection circuit for odd and even pins. By switching the potential twice in both directions, the corresponding LED is lit, and the defects of open circuit and short circuit between adjacent solder joints in the flat FPC cable of the CT detector are detected simultaneously and quickly. The circuit structure is extremely simple, requires no software development or parameter debugging, has low hardware cost, one-button operation, and intuitive and error-free test interpretation, which greatly improves the efficiency of batch cable inspection on site and is suitable for full inspection of mass production in the workshop. Attached Figure Description
[0012] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0013] Figure 1 This is a flowchart of the testing method for a flat FPC cable used in a CT detector according to an embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the application of the flat FPC cable testing method for CT detectors according to an embodiment of the present invention. Detailed Implementation
[0014] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.
[0015] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of the invention described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0016] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0017] According to embodiments of the present invention, a method for testing flat FPC cables for CT detectors is provided, such as... Figure 1 As shown, steps 101 to 103 are included below: Step 101: For the target flat FPC cable of the CT detector, define the two ends of the cable as the matching plug-in end and the rear end docking end, respectively. Align and insert the matching plug-in end of the target flat FPC cable into the preset A fixture plug-in socket, and simultaneously align and insert the rear end docking end into the preset B fixture plug-in socket. In this step, the fixed A fixture plug-in socket and the fixed B fixture plug-in socket, which match the standard interface specifications of the CT detector FPC, are pre-welded to the surface of the fixture plate. Simultaneously, the double-pole double-throw bidirectional reversing switch, the first LED visual indicator light, and the second LED visual indicator light are integrated and welded to the preset circuit points on the fixture plate. According to the closed-loop insulation wiring specifications, two independent insulation closed-loop detection circuits are connected to form a closed loop.
[0018] In this step, a dedicated, minimalist passive test fixture circuit is used as the core adapter. This circuit does not include an MCU programmable control unit, an industrial computer intelligent measurement and control module, or programmable sampling peripherals. It only integrates a fixed fixture docking and plugging component, a bidirectional switching control component, a dual-channel visual photoelectric prompt feedback component, and a closed-loop continuity detection wiring circuit. It is compatible with multi-specification, multi-digit adapter CT detectors and provides full coverage docking and testing of dedicated flat FPC cables.
[0019] The testing method includes prefabricating and aligning the tooling circuit: a passive integrated testing tooling board is pre-fixed and laid out. Fixed tooling connectors A and B, matching the standard interface specifications of the CT detector FPC, are welded to the tooling board surface at designated points. Simultaneously, a double-pole double-throw bidirectional reversing switch, a first LED visual indicator light, and a second LED visual indicator light are integrated and welded to the pre-set circuit points on the tooling board. According to the closed-loop insulation wiring specifications, two independent insulation closed-loop testing circuits are connected to form a complete prefabricated integrated passive dedicated testing tooling circuit, ready for testing.
[0020] This includes non-destructive alignment and precise insertion positioning of the cable to be inspected: A single mass-produced CT detector target flat FPC cable is used, and the original docking ends at both ends of the cable are defined as the matching insertion end and the rear docking end, respectively. The matching insertion end of the target flat FPC cable is non-destructively aligned and inserted into the corresponding A tooling insertion socket on the tooling plate and locked tightly. At the same time, the rear docking end is non-destructively aligned and inserted into the corresponding B tooling insertion socket on the tooling plate and pressed tightly. Throughout the process, the insertion is kept without offset, without loose connection, and without pin compression deformation, completing the pre-contact preparation for closed-loop docking between the cable and the tooling circuit.
[0021] Step 102: Perform the first unidirectional circuit power-on continuity defect verification and the reverse commutation circuit cross-electrical verification respectively.
[0022] As an optional implementation of this embodiment, the verification of the first unidirectional circuit power-on continuity defect includes: forward adjustment of the double-pole double-throw bidirectional reversing switch to the low-position closed conduction position; relying on the built-in wiring link of the tooling circuit, synchronously triggering the circuit linkage adaptation action to achieve precise connection of the first core detection pin inside the A tooling connector to the VCC power supply potential, and synchronously linking the second reference detection pin inside the A tooling connector to the common ground potential; relying on the preset series closed-loop wiring logic, a complete forward conduction detection current loop is formed, and the current flows sequentially through the first core of the A tooling connector in a closed loop. The test pins, the corresponding odd-sequence full-function measurement and control pin array of the FPC cable under test, and the linkage adapter pin array of the B-tool connector are used to drive the first LED visual indicator light to match the power-on and standby. If the first LED visual indicator light is normally and stably lit, and the second LED visual indicator light is completely powered off, it is determined that there is no open circuit fault in the forward single-sided circuit and no short circuit coupling interference between adjacent pins. If the first LED visual indicator light cannot be lit normally, it is directly determined that there is a soldering open circuit defect in the odd-sequence pin range of the cable under test, or there is a short circuit electrical abnormality between adjacent measurement and control pins.
[0023] In this optional implementation, during the synchronous verification of the first unidirectional circuit conduction defect, the double-pole double-throw bidirectional reversing switch is manually adjusted to the low-position closed conduction position. Relying on the built-in wiring link of the tooling circuit, the circuit linkage adaptation action is synchronously triggered, achieving precise connection of the first core detection pin inside the A tooling connector to the VCC power supply potential, and simultaneously linking the second reference detection pin inside the A tooling connector to the common ground potential. Based on the preset series closed-loop wiring logic, a complete forward conduction detection current loop is formed, with the current flowing sequentially through the first core detection pin of the A tooling connector and the pin to be tested. The FPC cable corresponds to the odd-sequence full-function measurement and control pin array, and the B-tool connector is matched with the linkage adapter pin array. Finally, the directional return current drives the first LED visual indicator light to match the power-on and standby. The status of the light body is observed in real time. If the first LED visual indicator light is normally and stably lit, and the second LED visual indicator light is completely powered off, it is determined that there is no open circuit fault in the forward single-sided circuit and no short circuit coupling interference between adjacent pins. If the first LED visual indicator light cannot be lit normally, it is directly determined that there is a welding open circuit defect in the odd-sequence pin interval of the cable under test, or there is a short circuit electrical abnormality between adjacent measurement and control pins.
[0024] As an optional implementation method in this embodiment, the reverse commutation loop cross-electrical verification includes: reversely adjusting the double-pole double-throw bidirectional commutation switch to the high-position closed conduction position, relying on the synchronous commutation wiring logic of the tooling circuit, quickly switching the point potential adaptation state, realizing the switching of the No. 1 core detection pin inside the A tooling connector to the common ground potential, and synchronously linking the No. 2 reference detection pin inside the A tooling connector to the VCC power supply potential; synchronously reverse constructing an independent reverse closed-loop detection current loop, the loop current flows sequentially through the No. 2 reference detection pin of the A tooling connector. The pins, the even-numbered sequence full-function measurement and control pin array corresponding to the FPC cable under test, and the B-tool connector with matching linkage adapter pin array drive the second LED visual indicator light to power on and wait to be triggered to light up; if the second LED visual indicator light is normally and stably lit, and the first LED visual indicator light is completely powered off and turned off, the reverse verification circuit conduction performance is compliant and there is no short circuit crosstalk between pins in the cross-section; if the second LED visual indicator light cannot be lit normally, it is determined that there is a soldering open circuit fault in the even-numbered sequence pin section of the cable under test, or there is a continuous short circuit electrical failure problem in any adjacent measurement and control pins in the entire area.
[0025] In this optional implementation, the reverse commutation circuit cross-electrical verification includes reverse adjustment of the double-pole double-throw bidirectional commutation switch to the high-position closed conduction position. Relying on the synchronous commutation wiring logic of the tooling circuit, the potential adaptation state of the point position is quickly switched, realizing the switching of the No. 1 core detection pin inside the A tooling connector to the common ground potential, and synchronously linking the switching of the No. 2 reference detection pin inside the A tooling connector to the VCC power supply potential; synchronously reverse construction of an independent reverse closed-loop detection current loop, the loop current flows sequentially through the No. 2 reference detection pin of the A tooling connector and the FPC cable pair under test. The even-numbered sequence full-function measurement and control pin array and the B-tool connector with matching linkage adapter pin array are used to precisely drive the second LED visual indicator light to power on and be triggered to light up. The linkage status of the two lights is observed in real time in situ. If the second LED visual indicator light is normally and stably lit, and the first LED visual indicator light is completely powered off, the reverse verification circuit conduction performance is compliant and there is no short circuit crosstalk between the pins in the cross-section. If the second LED visual indicator light cannot be lit normally, it is determined that there is a soldering open circuit fault in the even-numbered sequence pin section of the cable under test, or there is a continuous short circuit electrical failure problem in any adjacent measurement and control pins in the entire area.
[0026] The two closed-loop detection circuits adopt a partitioned isolation and insulation wiring design. The physical wiring of the odd-numbered pin measurement and control loop and the even-numbered pin measurement and control loop are independent of each other and there is no cross-wiring coupling, which completely avoids the false short circuit detection error caused by crosstalk of the tooling circuit itself.
[0027] Step 103: Determine the quality level of the target flat FPC cable based on the verification results.
[0028] In this step, the quality grade of the finished cable is determined by a dual-state linkage: integrating the single-side circuit test data of the low-level setting and the reverse verification circuit test data of the high-level setting, and comparing the dual-LED lamp group linkage triggering conditions bidirectionally; only when the first LED and the second LED alternately and independently light up precisely during the entire process of switching between the low-level and high-level settings of the double-pole double-throw switch, without simultaneous lighting, without complete extinguishing, and without abnormal flickering fluctuations, is the CT detector flat FPC cable comprehensively judged to have compliant pin soldering continuity, no open circuits, and no short circuits between adjacent pins, and is calibrated as a qualified finished cable; all other non-standard lamp effect linkage conditions are uniformly calibrated as defective cables, sorted out and rejected for rework.
[0029] For example, refer to Figure 2 The width of the ribbon cable can be many digits. The above diagram uses an 8-digit ribbon cable as an example. The A and B connectors on the fixture board are soldered onto the circuit board. The FPC ribbon cable being tested is S. The A and B connectors of S are plugged into the A and B connectors on the fixture board, respectively. During operation, flip the double-pole double-throw switch down. LED1 will light up and LED2 will turn off. FPC cable being tested up will light up and LED1 will turn off, indicating that the ribbon cable is qualified.
[0030] When the double-pole double-throw switch is switched to the bottom, connector A1 on tooling board A is connected to VCC, and connector A2 is connected to ground. Due to the loop, current flows through A1, B1, B3, A3, A5, B5, B7, and A7, finally causing LED1 to light up. However, the voltage levels of connectors A2, B2, B4, A4, A6, B6, B8, and A8 are not grounded, so LED2 does not light up. If there is an open circuit (not properly soldered) in the path A1, B1, B3, A3, A5, B5, B7, A7 (LED1), LED1 will not light up. Similarly, if any signal in the path A1, B1, B3, A3, A5, B5, B7, A7 (LED1) is short-circuited with any adjacent pin in the path A2, B2, B4, A4, A6, B6, B8, A8 (LED2) (e.g., A1 and A2, A2 and A3, B1 and B2, B2 and B3, B3 and B4, B5 and B6, etc.), the voltage level in the path A1, B1, B3, A3, A5, B5, B7, A7 (LED1) will be 0, also causing LED1 to not light up. Similarly, when the double-pole double-throw switch is switched to the top position, connector A1 on tooling board A is connected to ground, and connector A2 is connected to VCC. Due to the loop, current flows through A2, B2, B4, A4, A6, B6, B8, and A8, finally causing LED2 to light up. The voltage levels of connectors A1, B1, B3, A3, A5, B5, B7, and A7 are grounded and not connected, so LED1 does not light up. If there is an open circuit (not properly soldered) in the path A2, B2, B4, A4, A6, B6, B8, A8, LED2, then LED2 will not light up. Similarly, if any signal in the path A2, B2, B4, A4, A6, B6, B8, A8, LED2, is short-circuited with adjacent pins (e.g., A1 and A2, A2 and A3, B1 and B2, B2 and B3, B3 and B4, B5 and B6), the voltage level in the path A2, B2, B4, A4, A6, B6, B8, A8, LED2 will be 0, also causing LED2 to not light up. This determines whether the ribbon cable is qualified.
[0031] According to an embodiment of the present invention, a testing device for flat FPC cables used in CT detectors is also provided. The device comprises an integrated passive testing fixture board, including: a main fixture board, a dual-channel FPC connector assembly, a bidirectional potential reversing switch assembly, a dual-channel LED audible and visual indicator assembly, and a closed-loop wiring circuit for odd and even pin zones. The dual-channel FPC connector assembly is fixedly bonded to the surface of the main fixture board and includes an A-type connector and a B-type connector. The A-type and B-type connectors are aligned and coaxially arranged, with their pin arrays corresponding one-to-one. This is used to coaxially lock the male and female connector ends of the flat FPC cables of the CT detector under test, achieving non-destructive closed-loop connection and conduction of all pins in the cable. The bidirectional potential reversing switch assembly is fixedly assembled in the main fixture board and uses a double-pole double-throw passive toggle switch. The double-pole synchronously switches the potential polarity of the entire circuit. The device has two fixed limit positions: a high-level grounding reversing position and a low-level power supply reversing position. The dual-channel LED audio-visual prompt component includes a first LED indicator and a second LED indicator. The two indicator lights are connected in series to the odd-numbered pin closed-loop wiring circuit and the even-numbered pin closed-loop wiring circuit, respectively, and illuminate independently in separate zones. The odd-even pin zone closed-loop wiring circuit is directly etched and integrated into the main body of the fixture, and is divided into two sets of independent insulated circuits: an odd-numbered pin detection circuit and an even-numbered pin detection circuit. The odd-numbered pin detection circuit is connected in series with the odd-numbered pins of fixture A and fixture B and the first LED indicator. The even-numbered pin detection circuit is connected in series with the even-numbered pins of fixture A and fixture B and the second LED indicator. The two circuits are synchronously controlled by a double-pole double-throw bidirectional potential reversing switch, which switches between the VCC power supply terminal and the common ground terminal in a time-sharing manner.
[0032] As an optional implementation of this embodiment, both the A tooling connector and the B tooling connector are equipped with an elastic snap-locking structure, which automatically locks the cable end after insertion.
[0033] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.
Claims
1. A method for testing flat FPC cables for CT detectors, characterized in that, include: For the flat FPC cable of the CT detector target, the two ends of the cable are defined as the matching plug-in end and the rear end docking end, respectively. The matching plug-in end of the target flat FPC cable is aligned and inserted into the preset A tooling plug-in socket, and the rear end docking end is aligned and inserted into the preset B tooling plug-in socket. The fixed A tooling plug-in socket and fixed B tooling plug-in socket matching the standard interface specification of the CT detector FPC are pre-welded to the surface of the tooling plate. At the same time, the double-pole double-throw bidirectional reversing switch, the first LED visual indicator light, and the second LED visual indicator light are integrated and welded to the preset circuit points on the tooling plate. According to the closed-loop insulation wiring specification, two independent insulation closed-loop detection circuits are connected to form. Perform the following checks: first unidirectional circuit power-on continuity defect verification and reverse commutation circuit cross-electrical verification. The quality level of the target flat FPC cable is determined based on the verification results.
2. The test method for flat FPC cables used in CT detectors according to claim 1, characterized in that, The verification of the continuity defect of the first unidirectional circuit includes: The positive control moves the double-pole double-throw bidirectional reversing switch to the low-position closed conduction position. Relying on the built-in wiring link of the tooling circuit, the circuit linkage adaptation action is triggered synchronously to achieve precise connection of the No. 1 core detection pin inside the A tooling connector to the VCC power supply potential, and synchronously link the No. 2 reference detection pin inside the A tooling connector to the common ground potential. Based on the preset series closed-loop routing logic, a complete forward conduction detection current loop is formed in a directional manner. The current flows sequentially through the core detection pin of the A tooling connector, the corresponding odd-numbered sequence full-function measurement and control pin array of the FPC cable under test, and the matching linkage adapter pin array of the B tooling connector. Finally, the current flows back in a directional manner to drive the first LED visual indicator light to match the power-on and light-up status. If the first LED visual indicator light is normally and stably lit, and the second LED visual indicator light is completely powered off and turned off, it is determined that there is no open circuit fault in the positive single-sided circuit and no short circuit coupling interference between adjacent pins. If the first LED visual indicator light fails to light up normally, it is directly determined that there is a soldering open circuit defect in the odd-numbered pin range of the cable under test, or there is an electrical abnormality due to short circuit between adjacent measurement and control pins.
3. The test method for flat FPC cables used in CT detectors according to claim 2, characterized in that, Performing a cross-electrical verification of the reverse commutation circuit includes: Reverse control moves the double-pole double-throw bidirectional reversing switch to the high-position closed conduction position. Relying on the synchronous reversing wiring logic of the tooling circuit, it quickly switches the point potential adaptation state, realizes the switching of the No. 1 core detection pin inside the A tooling connector to the common ground potential, and synchronously links the No. 2 reference detection pin inside the A tooling connector to the VCC power supply potential. Synchronous reverse construction of independent reverse closed-loop detection current loop, the loop current flows sequentially through the second reference detection pin of the A tooling connector, the even-numbered sequence full-function measurement and control pin array of the FPC cable under test, and the matching linkage adapter pin array of the B tooling connector, driving the second LED visual indicator light to power on and light up when triggered. If the second LED visual indicator light is normally and stably lit, and the first LED visual indicator light is completely powered off and turned off, the reverse verification circuit conduction performance is compliant and there is no short-circuit crosstalk between the pins in the cross-section; If the second LED visual indicator light fails to light up normally, it is determined that there is a soldering open circuit fault in the even-numbered pin range of the cable under test, or there is a short circuit and poor electrical performance in any adjacent measurement and control pins across the entire range.
4. The test method for flat FPC cables used in CT detectors according to claim 3, characterized in that, The quality level of the target flat FPC cable is determined based on the verification results, including: Only when the first LED and the second LED alternately and independently light up during the entire process of switching between the low and high positions of the double-pole double-throw switch, without simultaneous lighting, without all LEDs going out, and without abnormal flickering fluctuations, is the CT detector flat FPC cable judged to have compliant pin soldering continuity, no open circuits, and no poor short circuits between adjacent pins, and is calibrated as a qualified finished product cable. The remaining lines are marked as defective.
5. The test method for flat FPC cables used in CT detectors according to claim 1, characterized in that, Both the A-tool connector and the B-tool connector adopt anti-offset locking FPC special surface mount connectors. The pin spacing of the terminals matches the standard pin layout of the mass-produced flat FPC cables for CT detectors. They are compatible with 8-bit, 12-bit, and 16-bit multi-gradient cable adapters.
6. A testing device for a flat FPC cable used in a CT detector, characterized in that, The device is applied to the test method for flat FPC cables for CT detectors as described in any one of claims 1 to 5; the device is an integrated passive test fixture board, including: a fixture main board, an FPC dual-channel docking and plugging assembly, a bidirectional potential reversing switch assembly, a dual-channel LED audible and visual prompt assembly, and an odd and even pin partitioned closed-loop wiring circuit. The FPC dual-path docking and plugging assembly is fixedly bonded and welded to the surface of the tooling motherboard. It includes tooling socket A and tooling socket B. Tooling socket A and tooling socket B are aligned and coaxially arranged, and their pin arrays correspond one-to-one. They are used to coaxially lock the male and female docking ends of the flat FPC cable of the CT detector under inspection, so as to realize the non-destructive closed-loop docking and conduction of the entire pin range of the cable. The bidirectional potential reversing switch assembly is fixedly assembled in the main body of the tooling. It adopts a double-pole double-throw passive toggle switch. The double-pole synchronous linkage synchronously switches the potential polarity of the entire circuit. The switch is set with two limit fixed positions: a high-level grounding reversing position and a low-level power supply reversing position. The dual-channel LED sound and light prompt component includes a first LED indicator and a second LED indicator. The two indicator lights are connected in series to the odd-numbered pin closed-loop wiring circuit and the even-numbered pin closed-loop wiring circuit, respectively, and illuminate independently in separate zones. The odd / even pin partitioned closed-loop wiring circuit is directly etched and integrated into the motherboard body of the fixture, and is divided into two independent insulated circuits: an odd-sequence pin detection circuit and an even-sequence pin detection circuit. The odd-sequence pin detection circuit is connected in series with the odd-numbered pins of fixture A and fixture B and the first LED indicator. The even-sequence pin detection circuit is connected in series with the even-numbered pins of fixture A and fixture B and the second LED indicator. The two circuits are synchronously controlled by a double-pole double-throw bidirectional potential reversing switch, which switches between the VCC power supply terminal and the common ground terminal in a time-sharing manner.
7. The flat FPC cable testing device for CT detectors according to claim 6, characterized in that, Both the A-tool connector and the B-tool connector are equipped with an elastic snap-locking structure, which automatically locks the cable end after insertion.