FPC test fixture and test system
By designing an angle-set SMA test head and compatible package connector in the FPC test fixture, the problem of high costs in the existing technology is solved, and the test effect of small area, low cost and low signal loss is achieved.
Patent Information
- Application Number
- CN202421926113.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-08-09
AI Technical Summary
The existing FPC test fixtures have high costs due to the large area of parallel settings of SMA test heads.
A FPC test fixture is designed, in which the angle is set between the two SMA test heads on the same side, and the connector is fixedly installed on the surface of the PCB in a vertical direction, clamping the FPC to be tested, compatible with connectors with different pin counts, and increasing the number of solder joints to improve firmness.
It reduces the area and cost of FPC test fixtures, reduces signal line loss, and improves the accuracy and compatibility of test results.
Smart Images
Figure CN223078365U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuit board testing, and more specifically, to an FPC test fixture and a test system. Background Art
[0002] An FPC (Flexible Printed Circuit) is a circuit board made of a flexible substrate, which has high flexibility and bendability, can be bent and folded in three-dimensional space, and is suitable for various complex electronic products. Due to its flexibility and thinness, a special test fixture is required to ensure the accuracy and reliability of the FPC test.
[0003] In the existing test fixture, two adjacent SMA (Sub-Miniature-A, coaxial connector) test heads on the same side are arranged in parallel, which results in that the SMA test heads need to occupy a large area of the test fixture, making the area of the test fixture large and the cost high. Summary of the Utility Model
[0004] The utility model provides an FPC test fixture and a test system to reduce costs. The specific technical solutions are as follows:
[0005] In a first aspect, the utility model provides an FPC test fixture, which includes a printed circuit board PCB, at least one group of coaxial connector SMA test heads, and two connectors;
[0006] The two connectors are respectively fixedly installed on the surface layer of the PCB in the vertical direction, and the flexible circuit board to be tested FPC is clamped between the two connectors and is signal-connected to the to-be-tested FPC;
[0007] Each group of SMA test heads includes two pairs of SMA test heads symmetrically arranged with the vertical center line of the PCB as the symmetry line, and each pair of SMA test heads includes two SMA test heads;
[0008] One end of each SMA test head in each pair of SMA test heads is fixedly connected to the PCB and is signal-connected to the connector closest to the two connectors, and the other end is signal-connected to the test device, and the included angle between the two SMA test heads in each pair of SMA test heads is a preset angle.
[0009] Optionally, the pin pitch of the two connectors is the same.
[0010] Optionally, the number of pins of the two connectors is 30 pins each.
[0011] Optionally, the number of pins of the two connectors is 45 pins each.
[0012] Optionally, the pin count of both of the two connectors is 60 pins.
[0013] Optionally, on the side of the two connectors close to the FPC to be tested, card slots are provided, and both sides of the FPC to be tested are respectively snapped into the card slots of the two connectors.
[0014] Optionally, the two connectors are respectively soldered to the surface layer of the PCB in the vertical direction.
[0015] Optionally, one end of each SMA test head in each pair of SMA test heads is soldered to the PCB.
[0016] Optionally, the preset angle is 40°.
[0017] In a second aspect, the present utility model provides a test system, including a test device and an FPC test fixture as described in any one of the first aspects, which are signal-connected to each other.
[0018] As can be seen from the above, an FPC test fixture provided in this embodiment includes a PCB, at least one set of SMA test heads, and two connectors. The two connectors are respectively fixedly installed on the surface layer of the PCB in the vertical direction, and the FPC to be tested is clamped between the two connectors and signal-connected to the FPC to be tested. Each set of SMA test heads includes two pairs of SMA test heads symmetrically arranged with the vertical center line of the PCB as the symmetry line. Each pair of SMA test heads includes two SMA test heads. One end of each SMA test head in each pair of SMA test heads is fixedly connected to the PCB and signal-connected to the connector closest to it among the two connectors, and the other end is signal-connected to the test device. Moreover, the included angle between the two SMA test heads in each pair of SMA test heads is a preset angle. Since the two SMA test heads on the same side have an angle and are not parallel, less area of the PCB can be occupied, so that the area of the FPC test fixture is smaller, reducing the cost.
[0019] The innovative points of the embodiments of the present utility model include:
[0020] 1. Since the two SMA test heads on the same side have an angle and are not parallel, less area of the PCB can be occupied, so that the area of the FPC test fixture is smaller, reducing the cost.
[0021] 2. By providing card slots on the side of the two connectors close to the FPC to be tested, and respectively snapping both sides of the FPC to be tested into the card slots of the two connectors to clamp the FPC to be tested, this connection method enables the FPC test fixture to bear a part of the stress of the FPC to be tested, reducing the risk of the FPC to be tested being broken.
[0022] 3. By setting the same pitch for the pin needles of the two connectors, the FPC test fixture provided by the present utility model can be compatible with a variety of connectors with different numbers of pins, achieving compatible packaging, enabling connectors with different numbers of pins to use the FPC test fixture provided by the present utility model without the need to use other test fixtures additionally, greatly reducing the cost.
[0023] 4. Due to the compatible packaging design of the FPC test fixture provided by the utility model, the number of solder joints is increased, enabling the connector to be welded more firmly to the surface layer of the PCB.
[0024] 5. Since the area of the FPC test fixture is reduced, the length of the traces inside the FPC test fixture is also reduced, reducing the loss of the signal lines and further reducing the impact of the FPC test fixture on the test results.
[0025] 6. A test system provided by an embodiment of the present utility model includes a test device and an FPC test fixture that are signal-connected to each other. There is an angle between the two SMA test heads on the same side of the FPC test fixture and they are not parallel. Therefore, it can occupy less area of the PCB, making the area of the FPC test fixture smaller, reducing the cost of the FPC test fixture, and further reducing the cost of the test system.
[0026] Of course, it is not necessary for any product or method implementing the present utility model to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0028] Figure 1 It is a schematic structural diagram of an FPC test fixture provided by an embodiment of the present utility model;
[0029] Figure 2 It is a schematic structural diagram of a test system provided by an embodiment of the present utility model.
[0030] Figure 1 - Figure 2 In the figure, 1 is the PCB, 2 is the connector, 3 is the FPC to be tested, 4 is the SMA test head, and 5 is the test device. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0032] It should be noted that the terms "include" and "have" and any variations thereof in the embodiments of the present invention and the accompanying drawings are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.
[0033] The embodiments of the present invention disclose an FPC test fixture and a test system, which can reduce costs. The embodiments of the present invention will be described in detail below.
[0034] Figure 1 It is a schematic structural diagram of an FPC test fixture provided by an embodiment of the present invention. Figure 2 It is a schematic structural diagram of a test system provided by an embodiment of the present invention.
[0035] See Figure 1 , the FPC test fixture provided by the embodiment of the present invention includes a PCB (Printed Circuit Board, printed circuit board) 1, at least one group of SMA (Sub-Miniature-A, coaxial connector) test heads, and two connectors 2.
[0036] Continuing to refer to Figure 1 , the two connectors 2 are respectively fixedly installed on the surface layer of the PCB 1 in the vertical direction, and the to-be-tested FPC (Flexible Printed Circuit, flexible circuit board) 3 is clamped between the two connectors 2 and is signal-connected to the to-be-tested FPC 3.
[0037] Among them, the way that the two connectors 2 are respectively fixedly installed on the surface layer of the PCB 1 in the vertical direction can be: the two connectors 2 are respectively welded to the surface layer of the PCB 1 in the vertical direction.
[0038] The way that the to-be-tested FPC 3 is clamped between the two connectors 2 can be: a card slot is arranged on one side of the two connectors 2 close to the to-be-tested FPC 3, and both sides of the to-be-tested FPC 3 are respectively inserted into the card slots of the two connectors 2.
[0039] Thus, by setting slots on the side of the two connectors 2 close to the FPC 3 to be measured, the two sides of the FPC 3 to be measured are respectively clamped into the slots of the two connectors 2 to clamp the FPC 3 to be measured. This connection method enables the FPC test fixture to bear part of the stress of the FPC to be measured and reduces the risk of the FPC to be measured being broken.
[0040] Among them, the pitch of the pin pins of the two connectors 2 is the same. Exemplarily, the pitch of the pin pins of the two connectors 2 is 0.5 mm.
[0041] Exemplarily, the number of pins of the two connectors 2 is 30 pins each. Or, the number of pins of the two connectors is 45 pins each. Or, the number of pins of the two connectors is 60 pins each.
[0042] Thus, by setting the same pitch of the pin pins of the two connectors 2, the FPC test fixture provided by the present utility model can be compatible with a variety of connectors 2 with different numbers of pins, realizing compatible packaging, so that connectors 2 with different numbers of pins can all use the FPC test fixture provided by the present utility model, without the need to use other test fixtures additionally, greatly reducing the cost.
[0043] Moreover, since each connector 2 is welded to the surface layer of the PCB 1 through the solder joints at both ends, corresponding solder joint positions are reserved on the surface layer of the PCB 1. For example: assuming that the FPC test fixture provided by the present utility model can be compatible with connectors 2 with 30 pins and 60 pins, then two solder joints corresponding to the connector 2 with 30 pins and two solder joints corresponding to the connector 2 with 60 pins are reserved on the surface layer of the PCB 1, and one of the solder joints is repeated. Therefore, three solder joints are reserved on the surface layer of the PCB 1. Then, when using a connector 2 with a larger number of pins, such as a connector 2 with 60 pins, it can be welded to the surface layer of the PCB 1 through three solder joints. Compared with being welded to the surface layer of the PCB 1 only through two solder joints without a compatible packaging structure, the welding is more firm.
[0044] That is to say, due to the compatible packaging design of the FPC test fixture provided by the utility model, the number of solder joints is increased, enabling the connector 2 to be welded more firmly to the surface layer of the PCB 1.
[0045] Continue to refer to Figure 1 and Figure 2 , each group of SMA test heads includes two pairs of SMA test heads 4 symmetrically arranged with the vertical center line of the PCB 1 as the symmetry line. Each pair of SMA test heads includes two SMA test heads 4, that is, there is a pair of SMA test heads 4 on each side of the vertical center line of the PCB 1.
[0046] One end of each SMA test head 4 in each pair of SMA test heads is fixedly connected to the PCB1 and is signal-connected to the nearest connector 2 among the two connectors 2, and the other end is signal-connected to the test device 5.
[0047] Among them, the way that one end of each test head 4 in each pair of SMA test heads is fixedly connected to the PCB1 can be: one end of each SMA test head 4 in each pair of SMA test heads is soldered to the PCB1. Since the connector 2 is signal-connected to the FPC3 to be tested, and the SMA test head 4 is signal-connected to the connector 2, therefore, the SMA test head 4 connects the test device 5 and the FPC3 to be tested, ensuring signal transmission between the test device 5 and the FPC3 to be tested.
[0048] Continue to refer to Figure 1 , the included angle between the two SMA test heads 4 in each pair of SMA test heads is a preset angle. Exemplarily, the preset angle can be 40°.
[0049] That is to say, there is an angle between the two SMA test heads 4 on the same side and they are not parallel. Therefore, it can occupy less area of the PCB1.
[0050] Exemplarily, the FPC test fixture includes a group of SMA test heads. That is to say, the FPC test fixture includes 4 SMA test heads 4.
[0051] The specific steps for testing using the FPC test fixture provided by the present utility model are as follows:
[0052] 1. Solder two applicable connectors 2 and multiple SMA test heads 4 to the surface layer of the PCB1.
[0053] 2. Insert the FPC3 to be tested onto the two connectors 2.
[0054] 3. After calibrating the test device 5, connect the test device 5 to multiple SMA test heads 4.
[0055] 4. Extract the scattering parameters through the test device 5, perform de-embedding processing on the scattering parameters, and obtain the scattering parameters of the FPC3 to be tested.
[0056] In summary, a kind of FPC test fixture provided by an embodiment of the present utility model includes a PCB 1, at least one group of SMA test heads and two connectors 2. The two connectors 2 are respectively fixedly installed on the surface layer of the PCB 1 along the vertical direction, and the to-be-tested FPC 3 is clamped between the two connectors 2 and is signal-connected to the to-be-tested FPC 3. Each group of SMA test heads includes two pairs of SMA test heads 4 symmetrically arranged with the vertical center line of the PCB 1 as the symmetry line. Each pair of SMA test heads includes two SMA test heads 4. One end of each SMA test head 4 in each pair of SMA test heads is fixedly connected to the PCB 1 and is signal-connected to the connector 2 closest to the two connectors 2, and the other end is signal-connected to the test device 5. Moreover, the included angle between the two SMA test heads 4 in each pair of SMA test heads is a preset angle. Since the two SMA test heads 4 on the same side have an angle and are not parallel, the area of the PCB 1 occupied can be less, making the area of the FPC test fixture smaller and reducing the cost.
[0057] Moreover, since the area of the FPC test fixture is reduced, the wiring length inside the FPC test fixture is also reduced, the loss of the signal line is reduced, and the influence of the FPC test fixture on the test result is further reduced.
[0058] Continue to refer to Figure 2 , an embodiment of the present utility model also provides a test system, which includes a test device 5 and an FPC test fixture as provided in any one of the above embodiments and is signal-connected to each other. Figure 2 The connection lines between the left and right sides of the to-be-tested FPC 3 and the connector 2 in
[0059] are only for illustration, and there is actually no connection line.
[0060] Therefore, a test system provided by an embodiment of the present utility model includes a test device 5 and an FPC test fixture that are signal-connected to each other. The two SMA test heads 4 on the same side in the FPC test fixture have an angle and are not parallel. Therefore, the area of the PCB 1 occupied can be less, making the area of the FPC test fixture smaller, reducing the cost of the FPC test fixture, and further reducing the cost of the test system.
[0061] Those of ordinary skill in the art can understand that the drawings are only schematic diagrams of an embodiment, and the modules or processes in the drawings are not necessarily essential for implementing the present utility model.
[0062] Those of ordinary skill in the art can understand that the modules in the device in the embodiments can be distributed in the device in the embodiments as described, or can be correspondingly changed and located in one or more devices different from this embodiment. The modules in the above embodiments can be combined into one module, or can be further split into multiple sub-modules.
[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. An FPC test fixture, characterized in that, It includes a printed circuit board (PCB), at least one set of coaxial connector SMA test heads, and two connectors; The two connectors are respectively and fixedly installed on the surface layer of the PCB in the vertical direction, and a flexible printed circuit board (FPC) to be tested is clamped between the two connectors and is signal-connected to the FPC to be tested; Each set of SMA test heads includes two pairs of SMA test heads symmetrically arranged with the vertical center line of the PCB as the symmetry line, and each pair of SMA test heads includes two SMA test heads; One end of each SMA test head in each pair of SMA test heads is fixedly connected to the PCB and is signal-connected to the connector closest to the two connectors, and the other end is signal-connected to a test device, and the included angle between the two SMA test heads in each pair of SMA test heads is a preset angle.
2. The FPC test fixture according to claim 1, wherein, The pitch of the pin pins of the two connectors is the same.
3. The FPC test fixture according to claim 2, wherein, The number of pins of the two connectors is 30 pins each.
4. The FPC test fixture according to claim 2, characterized in that, The number of pins of the two connectors is 45 pins each.
5. The FPC test fixture according to claim 2, characterized in that, The number of pins of the two connectors is 60 pins each.
6. The FPC test fixture according to claim 1, characterized in that A card slot is arranged on one side of the two connectors close to the FPC to be tested, and both sides of the FPC to be tested are respectively inserted into the card slots of the two connectors.
7. The FPC test fixture according to claim 1, wherein The two connectors are respectively welded to the surface layer of the PCB in the vertical direction.
8. The FPC test fixture according to claim 1, characterized in that, One end of each SMA test head in each pair of SMA test heads is welded to the PCB.
9. The FPC test fixture according to claim 1, characterized in that, The preset angle is 40°.
10. A test system, characterized in that, It includes a test device and an FPC test fixture as described in any one of claims 1-9 that are signal-connected to each other.