Keyboard flexible circuit board testing device

Abstract

The utility model relates to a keyboard flexible circuit board testing device. The keyboard flexible circuit board testing device comprises a rack; the lower testing frame is used for horizontally placing the workpiece; the upper testing frame is vertically arranged on the rack in a sliding manner; the initial pressing block is arranged on the upper testing frame in a sliding and penetrating mode, the initial pressing block is in a stepped shaft shape, the part, with the large shaft diameter, of the initial pressing block abuts against the upper testing frame and is used for enabling the initial pressing block to be hung on the upper testing frame, and the initial pressing block is used for abutting against a workpiece; the supplementary pressing block is arranged on the upper testing frame in a sliding manner, and the supplementary pressing block abuts against the upper end of the initial pressing block; and the lifting and falling control piece is arranged on the upper testing frame, and the lifting and falling control piece is connected with the supplementary pressing block and used for pulling up the supplementary pressing block or enabling the supplementary pressing block to fall down along with the gravity of the supplementary pressing block. The supporting force of the flexible circuit board in an unused state and the triggering pressure required by the flexible circuit board in a used state can be tested at the same time, so that the testing parameters of the device are more diversified.

Description

Technical Field

[0001] The present application relates to the field of circuit board testing equipment, and in particular, to a testing device for a keyboard flexible printed circuit board. Background Art

[0002] The keyboard of a laptop computer includes a flexible printed circuit board and silicone keys. After the flexible printed circuit board is processed, it needs to be tested to ensure that the corresponding positions on the flexible printed circuit board are electrically connected when the keys are pressed.

[0003] In the related art, a testing device for a keyboard flexible printed circuit board includes a frame, a lower testing frame, an upper testing frame, and a pressing expander. The lower testing frame is fixedly arranged on the frame, the upper testing frame is vertically slidably arranged on the frame, the upper testing frame is located above the lower testing frame, and the pressing expander is arranged on the upper testing frame. One pressing expander corresponds to one key position of the flexible printed circuit board. Considering the layout space between multiple pressing expanders, each pressing expander has only two states: extending and retracting. When performing the testing work, first place the flexible printed circuit board at a predetermined position on the lower testing frame, then lower the upper testing frame to a predetermined height above the lower testing frame, and then extend the pressing expander to press the flexible printed circuit board to determine whether it is qualified according to whether the corresponding key positions on the flexible printed circuit board are electrically connected.

[0004] In view of the above related art, there is a defect that since the pressing expander can only extend and retract, only one pressing force can be used to press and test the flexible printed circuit board, and it is impossible to simultaneously test the supporting force of the flexible printed circuit board in the unused state and the triggering pressure required in the used state, resulting in relatively single test parameters of the device. Summary of the Invention

[0005] In order to be able to simultaneously test the supporting force of the flexible printed circuit board in the unused state and the triggering pressure required in the used state, so as to make the test parameters of the device more diversified, the present application provides a testing device for a keyboard flexible printed circuit board.

[0006] The testing device for a keyboard flexible printed circuit board provided by the present application adopts the following technical solutions:

[0007] A testing device for a keyboard flexible printed circuit board, comprising:

[0008] A frame;

[0009] A lower testing frame for horizontally placing a workpiece;

[0010] An upper testing frame vertically slidably arranged on the frame;

[0011] The initial pressing block is slidably inserted through the upper test frame. The initial pressing block is in the shape of a stepped shaft. The part of the initial pressing block with a larger shaft diameter abuts against the upper test frame, so as to hang the initial pressing block on the upper test frame. The initial pressing block is used to abut against the workpiece.

[0012] The supplementary pressing block is slidably arranged on the upper test frame. The supplementary pressing block abuts against the upper end of the initial pressing block.

[0013] The lifting and lowering control member is arranged on the upper test frame. The lifting and lowering control member is connected to the supplementary pressing block and is used to pull up the supplementary pressing block or let the supplementary pressing block fall by its own gravity.

[0014] By adopting the above technical solutions, firstly, during the test, the upper test frame is lowered to make the initial pressing block abut against the flexible circuit board. At the same time, the supplementary pressing block is separated from the initial pressing block by the lifting and lowering control member. If the flexible circuit board is not conductive, the requirement of the supporting force is met, so that the key can be stably supported during actual use. Therefore, the flexible circuit board is not conductive when the key is not pressed. After the initial pressing block passes the test, the supplementary pressing block is pressed on the initial pressing block by the lifting and lowering control member to additionally increase the pressing force on the workpiece. If the flexible circuit board is conductive, the requirement of the triggering pressure is met, so that the key can be pressed down by a predetermined pressure during actual use. Therefore, the flexible circuit board can be made conductive by a predetermined pressure. In summary, the working parameters of the flexible circuit board in the unused state and the used state can be tested simultaneously, so that the test parameters of the test device can be more diversified. Secondly, since the initial pressing block is slidably hung on the upper test frame, the structure between the initial pressing block and the upper test frame is simpler. Therefore, the volume of the initial pressing block can be larger, so that the initial pressing block can fully press the flexible circuit board in a compact layout. Thirdly, an additional pressure is increased by pressing the supplementary pressing block on the initial pressing block. The additional pressure depends on the gravity of the supplementary pressing block. Therefore, the total pressure received by the flexible circuit board can be more accurately controlled, and thus the test of the flexible circuit board can be more accurately completed.

[0015] Preferably, the lifting and lowering control member realizes the rising and falling of the supplementary pressing block through electromagnetism.

[0016] By adopting the above technical solutions, compared with the method of realizing the lifting and lowering of the supplementary pressing block by winding and unwinding a rope, in this design method, by using electromagnetism, the whole lifting and lowering control member can be made more concise, so that the structure of the test device can be more simple and compact.

[0017] Preferably, the lifting and lowering control member includes an electromagnet, a lifting and lowering rod, and a lifting spring. The electromagnet is tubular and fixed on the upper test frame. The lifting and lowering rod is slidably disposed inside the electromagnet. The lifting and lowering rod moves downward under the action of the magnetic field, and the lower end of the lifting and lowering rod is for hanging the supplementary pressing block. One end of the lifting spring is connected to the lifting and lowering rod, and the other end is connected to the electromagnet for moving the lifting and lowering rod upward after the electromagnet is turned off.

[0018] By adopting the above technical solution, when the electromagnet is started, the lifting and lowering rod can be moved downward by the magnetic field until the supplementary pressing block abuts against the initial pressing block. At the same time, the pulling force of the lifting and lowering rod on the supplementary pressing block is released. Therefore, the gravity of the supplementary pressing block can be completely transmitted to the pressing block and finally to the flexible circuit board. After the electromagnet is turned off, the lifting spring moves the lifting and lowering rod upward to separate the supplementary pressing block from the initial pressing block, thereby realizing two pressure tests on the flexible circuit board.

[0019] Preferably, a buffer cap is provided at one end of the lifting and lowering rod away from the supplementary pressing block. The buffer cap is made of an elastic material and abuts against the upper end surface of the electromagnet.

[0020] By adopting the above technical solution, due to the setting of the buffer cap, the posture of the lifting and lowering rod in the stopped state can be more stable, so it is not easy to interfere with the supplementary pressing block, and thus the supplementary pressing block can stably apply pressure to the flexible circuit board.

[0021] Preferably, the supplementary pressing block is divided into a supplementary pressing part and a connecting part. The supplementary pressing part is columnar and abuts against the initial pressing block. The connecting part is tubular and provided with two connecting sliding holes symmetrically arranged with respect to the center of the connecting part. The inner side of the connecting part is for the lifting and lowering rod to pass through. A connecting pin is provided on the part of the lifting and lowering rod inside the connecting part. The connecting pin is perpendicular to the lifting and lowering rod, and the connecting pin passes through the two connecting sliding holes.

[0022] By adopting the above technical solution, with the cooperation between the connecting sliding holes and the connecting pins, the sliding hanging connection between the supplementary pressing block and the lifting and lowering rod is realized, and the relative axial rotation between the supplementary pressing block and the lifting and lowering rod is not easy to occur. Thus, the lifting and lowering rod can make the rising and falling of the supplementary pressing block more stable and smooth.

[0023] Preferably, the outer diameter of the connecting part is smaller than the outer diameter of the supplementary pressing part, and a counterweight tube is sleeved on the connecting part.

[0024] By adopting the above technical solution, there can be more pressing forces of different sizes, so as to further diversify the test parameters of the test device.

[0025] Preferably, a positioning groove is provided on the upper side of the lower test frame. The positioning groove is for placing the workpiece. A limiting block is slidably embedded in the side wall of the positioning groove, and the limiting block moves in a direction close to or away from the center of the positioning groove.

[0026] By adopting the above technical solution, the positioning range can be correspondingly changed according to the size specification of the workpiece.

[0027] Preferably, the upper test frame is provided with a guiding column, and the lower test frame is provided with a guiding groove for the guiding column to slidably penetrate.

[0028] By adopting the above technical solution, with the cooperation between the guiding column and the guiding groove, the rising and falling trajectories of the upper test frame can be made more precise, so that the initial pressing block can press down on the predetermined key position more accurately.

[0029] In summary, the present application includes at least one of the following beneficial technical effects:

[0030] 1. During the test, the upper test frame is moved downward so that the initial pressing block abuts against the flexible circuit board. At the same time, the supplementary pressing block is separated from the initial pressing block through the lifting control member. If the flexible circuit board is not conducting, the requirement for the supporting force is met, so that the key can be stably supported during actual use. Therefore, the flexible circuit board will not conduct when the key is not pressed. After the initial pressing block passes the test, the supplementary pressing block is pressed on the initial pressing block through the lifting control member to additionally increase the pressing force on the workpiece. If the flexible circuit board conducts, the requirement for the triggering pressure is met, so that the key can be pressed down by a predetermined pressure during actual use. Therefore, the flexible circuit board can be made to conduct through the predetermined pressure. In summary, the working parameters of the flexible circuit board in both the unused state and the used state can be tested simultaneously, so that the test parameters of the test device can be made more diversified;

[0031] 2. By pressing the supplementary pressing block on the initial pressing block to increase the additional pressure, and the additional pressure depends on the gravity of the supplementary pressing block, so the total pressure received by the flexible circuit board can be more precisely controlled, and thus the test of the flexible circuit board can be more precisely completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of the flexible circuit board test device in the embodiment of the present application.

[0033] Figure 2 is a schematic diagram made to show the positional relationship of the initial pressing block, the supplementary pressing block and the lifting control member on the upper test frame in the embodiment of the present application.

[0034] Figure 3 is a schematic diagram made to show the specific structure of the lifting control member in the embodiment of the present application.

[0035] Description of the reference numerals: 1, frame; 2, lower test stand; 21, positioning groove; 22, limiting block; 23, guiding groove; 3, upper test stand; 31, guiding post; 4, initial pressing block; 5, supplementary pressing block; 51, supplementary pressing part; 52, connecting part; 6, lifting and lowering control member; 61, electromagnet; 62, lifting and lowering rod; 63, lifting spring; 7, buffer cap; 8, connecting sliding hole; 81, connecting pin; 9, counterweight pipe. Specific embodiments

[0036] The following will further describe this application in detail with reference to the Figures 1 - 3 accompanying drawings.

[0037] An embodiment of this application discloses a testing device for a flexible circuit board of a keyboard.

[0038] Referring to Figure 1 and Figure 2 , the testing device for the flexible circuit board of the keyboard includes a frame 1, a lower test stand 2, an upper test stand 3, an initial pressing block 4, a supplementary pressing block 5, and a lifting and lowering control member 6. The lower test stand 2 is horizontally arranged, and the upper side of the lower test stand 2 is for horizontally placing the workpiece; the upper test stand 3 is vertically slidably arranged on the frame 1; the initial pressing block 4 slidably penetrates through the upper test stand 3. The initial pressing block 4 abuts against the workpiece. The initial pressing block 4 is in the shape of a stepped shaft, and the part with a larger shaft diameter of the initial pressing block 4 abuts against the upper test stand 3, so that the initial pressing block 4 is hung on the upper test stand 3. Therefore, the initial pressing block 4 is slidably hung on the upper test stand 3; the supplementary pressing block 5 is slidably arranged on the upper test stand 3; the lifting and lowering control member 6 is arranged on the upper test stand 3, and the lifting and lowering control member 6 is connected to the supplementary pressing block 5. The lifting and lowering control member 6 can pull up the supplementary pressing block 5 to separate the supplementary pressing block 5 from the initial pressing block 4, or let the supplementary pressing block 5 fall by its own gravity to make the supplementary pressing block 5 abut against the initial pressing block 4.

[0039] Referring to Figure 1 and Figure 2 , the working principle is as follows. During the test, the upper test stand 3 is moved downward to make the initial pressing block 4 abut against the flexible circuit board, and at the same time, the supplementary pressing block 5 is separated from the initial pressing block 4 through the lifting and lowering control member 6. If the flexible circuit board is not conducting, it meets the requirement of the supporting force, so that the keys can be stably supported during actual use. Therefore, the flexible circuit board will not conduct when the keys are not pressed. After the initial pressing block 4 passes the test, the supplementary pressing block 5 is pressed on the initial pressing block 4 through the lifting and lowering control member 6 to additionally increase the pressing force on the workpiece. If the flexible circuit board conducts, it meets the requirement of the triggering pressure, so that the keys can be pressed down by a predetermined pressure during actual use. Therefore, the flexible circuit board can be made to conduct by a predetermined pressure. In summary, the working parameters of the flexible circuit board in the unused state and the used state can be tested simultaneously, so that the test parameters of the testing device can be more diversified.

[0040] In addition, this embodiment also has the following advantages. First, the initial pressing block 4 is slidably hung on the upper test rack 3, so the connection structure is simple. Therefore, the volume of the initial pressing block 4 can be larger, so as to fully press the flexible circuit board under a compact layout. Second, the additional pressure depends on the gravity of the supplementary pressing block 5, so the total pressure on the flexible circuit board can be controlled more precisely, and thus the test of the flexible circuit board can be completed more precisely.

[0041] Referring to Figure 2 and Figure 3 , in order to make the structure of the lifting and lowering control member 6 simpler and make the structure of the test device more compact, the lifting and lowering control member 6 realizes the lifting and lowering of the supplementary pressing block 5 through electromagnetism. Specifically, the lifting and lowering control member 6 includes an electromagnet 61, a lifting and lowering rod 62 and a lifting spring 63. The electromagnet 61 is tubular and is fixed on the upper test rack 3; the lifting and lowering rod 62 is slidably inserted inside the electromagnet 61. The lifting and lowering rod 62 moves downward under the action of the magnetic field, and the lower end of the lifting and lowering rod 62 is for hanging the supplementary pressing block 5; one end of the lifting spring 63 is connected to the lifting and lowering rod 62, and the other end is connected to the electromagnet 61, which can make the lifting and lowering rod 62 move upward after the electromagnet 61 is turned off.

[0042] Referring to Figure 2 and Figure 3 , the working principle is as follows. When the electromagnet 61 is started, the lifting and lowering rod 62 can be moved downward through the magnetic field until the supplementary pressing block 5 abuts against the initial pressing block 4. At the same time, the lifting and lowering rod 62 releases the pulling force on the supplementary pressing block 5. Therefore, the gravity of the supplementary pressing block 5 can be completely transmitted to the pressing block and finally to the flexible circuit board. After the electromagnet 61 is turned off, the lifting spring 63 makes the lifting and lowering rod 62 move upward, so that the supplementary pressing block 5 is separated from the initial pressing block 4, thus realizing two kinds of pressure tests on the flexible circuit board.

[0043] Referring to Figure 2 and Figure 3 , in order to stably control the supplementary pressing block 5 by the lifting and lowering rod 62, the following settings are made. First, a buffer cap 7 is arranged at one end of the lifting and lowering rod 62 away from the supplementary pressing block 5. The buffer cap 7 is made of an elastic material and abuts against the upper end face of the electromagnet 61. The contact time between the buffer cap 7 and the electromagnet 61 is later than the contact time between the supplementary pressing block 5 and the initial pressing block 4. Therefore, when the buffer cap 7 abuts against the electromagnet 61, the lifting and lowering rod 62 has separated from the supplementary pressing block 5, and the lifting and lowering rod 62 no longer applies a pulling force to the supplementary pressing block 5. Therefore, the buffer cap 7 can be used to make the posture of the lifting and lowering rod 62 more stable when it stops falling, so as to be less likely to interfere with the supplementary pressing block 5, and further enable the supplementary pressing block 5 to stably apply pressure to the flexible circuit board.

[0044] Referring to Figure 2 and Figure 3, Second, the supplementary pressing block 5 is divided into a supplementary pressing part 51 and a connecting part 52. The supplementary pressing part 51 is columnar, and the supplementary pressing part 51 abuts against the initial pressing block 4; the connecting part 52 is tubular, and the connecting part 52 is provided with connecting sliding holes 8. There are two connecting sliding holes 8 symmetrically arranged with respect to the center of the connecting part 52, and the inner side of the connecting part 52 is for the lifting and lowering rod 62 to pass through; a connecting pin 81 is fixedly installed on the part of the lifting and lowering rod 62 inside the connecting part 52. The connecting pin 81 is perpendicular to the lifting and lowering rod 62, and the connecting pin 81 passes through the two connecting sliding holes 8. Then, by means of the cooperation between the connecting sliding holes 8 and the connecting pin 81, not only the sliding hanging connection between the supplementary pressing block 5 and the lifting and lowering rod 62 is realized, but also the relative axial rotation between the supplementary pressing block 5 and the lifting and lowering rod 62 is not likely to occur. Thus, the lifting and lowering rod 62 can make the rising and falling of the supplementary pressing block 5 more stable and smooth.

[0045] In addition, in this embodiment, in order to further increase the test diversity of the test device, the outer diameter of the connecting part 52 is smaller than the outer diameter of the supplementary pressing part 51. A counterweight pipe 9 is sleeved on the connecting part 52, and the counterweight pipe 9 abuts against the end face of the supplementary pressing part 51 close to the connecting part 52. Therefore, the gravity of the counterweight pipe 9 can be replaced to change the additional pressure applied by the supplementary pressing assembly, so that there can be more pressing forces of different sizes, and further make the test parameters of the test device more diversified.

[0046] Refer to Figure 1 , a positioning groove 21 is provided on the upper side of the lower test frame 2. The positioning groove 21 is for placing the workpiece. A limiting block 22 is slidably embedded in the side wall of the positioning groove 21. Specifically, the limiting block 22 has an oval-shaped hole, and a bolt is passed through the hole, and then the limiting block 22 is fixed by the bolt. The limiting block 22 can move in a direction close to or away from the center of the positioning groove 21, so that the positioning range can be correspondingly changed according to the size specification of the workpiece.

[0047] Refer to Figure 1 , the upper test frame 3 is provided with a guiding column 31, and the lower test frame 2 is provided with a guiding groove 23. The guiding groove 23 is for the guiding column 31 to slide through, so that the rising and falling trajectories of the upper test frame 3 can be more accurate, and thus the initial pressing block 4 can press down more accurately on the predetermined key position.

[0048] The implementation principle of a test device for a keyboard flexible printed circuit board in an embodiment of the present application is as follows: during the test, the upper test frame 3 is lowered so that the initial pressing block 4 abuts against the flexible printed circuit board. At the same time, the supplementary pressing block 5 is separated from the initial pressing block 4 through the lifting control member 6. If the flexible printed circuit board is not conducting, the requirement for the supporting force is met, so that the keys can be stably supported during actual use. Therefore, the flexible printed circuit board will not conduct when the keys are not pressed. After the initial pressing block 4 passes the test, the supplementary pressing block 5 is pressed on the initial pressing block 4 through the lifting control member 6 to additionally increase the pressing force on the workpiece. If the flexible printed circuit board conducts, the requirement for the triggering pressure is met, so that the keys can be pressed down by a predetermined pressure during actual use. Therefore, the flexible printed circuit board can be made to conduct by a predetermined pressure. In summary, the working parameters of the flexible printed circuit board in the unused state and the used state can be tested simultaneously, so that the test parameters of the test device can be made more diversified.

[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A keyboard flexible circuit board testing device, characterized in that: include: Rack (1); A lower test frame (2) for placing the workpiece horizontally; An upper test frame (3) vertically slidably arranged on the frame (1); An initial pressing block (4) is slidably mounted on the upper test frame (3); the initial pressing block (4) is in the shape of a stepped shaft; a portion of the initial pressing block (4) with a larger shaft diameter abuts against the upper test frame (3) and is used to hang the initial pressing block (4) on the upper test frame (3); and the initial pressing block (4) is used to abut against a workpiece; A supplementary pressing block (5) is slidably arranged on the upper test frame (3), and the supplementary pressing block (5) abuts against the upper end of the initial pressing block (4); A lifting and dropping control member (6) is arranged on the upper test frame (3); the lifting and dropping control member (6) is connected to the supplementary pressure block (5) and is used to pull up the supplementary pressure block (5) or allow the supplementary pressure block (5) to fall due to its own gravity.

2. The keyboard flexible circuit board testing device according to claim 1, characterized in that: The lifting and lowering control member (6) realizes the lifting and lowering of the supplementary pressing block (5) through electromagnetic.

3. The keyboard flexible circuit board testing device according to claim 2, characterized in that: The lifting and dropping control component (6) includes an electromagnet (61), a lifting and dropping rod (62) and a lifting spring (63). The electromagnet (61) is tubular and fixed on the upper test frame (3). The lifting and dropping rod (62) is slidably inserted into the inner side of the electromagnet (61). The lifting and dropping rod (62) moves downward under the action of the magnetic field, and the lower end of the lifting and dropping rod (62) is used for hanging the supplementary pressure block (5). One end of the lifting spring (63) is connected to the lifting and dropping rod (62), and the other end is connected to the electromagnet (61), so as to allow the lifting and dropping rod (62) to move upward after the electromagnet (61) is turned off.

4. The keyboard flexible circuit board testing device according to claim 3, characterized in that: A buffer cap (7) is provided at one end of the lifting rod (62) away from the supplementary pressure block (5); the buffer cap (7) is made of elastic material, and the buffer cap (7) abuts against the upper end surface of the electromagnet (61).

5. The keyboard flexible circuit board testing device according to claim 3, characterized in that: The supplementary pressure block (5) is divided into a pressure-compensating part (51) and a connecting part (52). The pressure-compensating part (51) is columnar and abuts against the initial pressure block (4). The connecting part (52) is tubular and is provided with a connecting slide hole (8). Two connecting slide holes (8) are symmetrically arranged relative to the center of the connecting part (52). The inner side of the connecting part (52) is provided with the lifting rod (62). The part of the lifting rod (62) located on the inner side of the connecting part (52) is provided with a connecting pin (81). The connecting pin (81) is perpendicular to the lifting rod (62), and the connecting pin (81) is provided with two connecting slide holes (8).

6. The keyboard flexible circuit board testing device according to claim 5, characterized in that: The outer diameter of the connecting portion (52) is smaller than the outer diameter of the pressure-compensating portion (51), and the connecting portion (52) is sleeved with a weight pipe (9).

7. The keyboard flexible circuit board testing device according to claim 1, characterized in that: A positioning groove (21) is provided on the upper side of the lower test frame (2), the positioning groove (21) being used to place a workpiece, and a limiting block (22) is slidably embedded in the side wall of the positioning groove (21), the limiting block (22) moving in a direction approaching or away from the center of the positioning groove (21).

8. The keyboard flexible circuit board testing device according to claim 1, characterized in that: The upper test frame (3) is provided with a guide column (31), and the lower test frame (2) is provided with a guide groove (23), wherein the guide column (31) is slidably inserted into the guide groove (23).

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