Electrical testing method, electrical testing head and equipment for keyboard circuit film semi-finished products

Abstract

The present application relates to the technical field of circuit film detection, and in particular to a method for electrically testing a semi-finished keyboard circuit film, comprising the following steps: unwinding a semi-finished circuit film roll, wherein the semi-finished circuit film roll integrally includes a plurality of keyboard circuit film semi-finished products; intermittently rolling out the semi-finished circuit film roll so that the keyboard circuit film semi-finished product is aligned below an electrical measuring head and electrically tested, wherein the electrical measuring head includes a probe and a pressing block, wherein the probe of the electrical measuring head is pressed one-to-one on the key electrode, and the pressing block of the electrical measuring head is pressed one-to-many on the wiring terminal, and an electrical signal is inputted to the pressing head, and the probe detects whether the key electrode has an electrical signal output; identifying whether the keyboard circuit film semi-finished product is a good product; and rewinding the keyboard circuit film semi-finished product after electrical testing and identification. The above scheme reduces production capacity loss and ensures the yield rate.

Description

Technical Field

[0001] The present application relates to the technical field of circuit film detection, and in particular to an electrical testing method, an electrical testing head, and equipment for a semi-finished keyboard circuit film. Background Art

[0002] Keyboard circuit membrane is a refined product in the category of membrane switches. It is a membrane switch with many buttons that are arranged neatly and orderly.

[0003] The production process for keyboard circuit film typically involves fabricating the circuitry using a reel-to-reel method. After lamination and cutting, the finished product undergoes electrical testing to assess its quality. Technological advancements and the demands for keyboard functionality have led to denser circuits than before. To ensure optimal electrical characteristics and lightweight keyboards, the key area aperture design necessitates a denser arrangement of circuits within the limited space. This necessitates the inclusion of a bridge circuit within the keyboard circuit film, further increasing the complexity of the circuitry. This also presents the problem of poor connection between the bridge circuit and the underlying circuitry when multiple silver paste patterns are printed.

[0004] Patent publication number CN101413972B relates to a system and method for testing the resistivity of thin-film thermoelectric materials. This thin-film thermoelectric material resistivity tester utilizes a novel dual-electrical four-probe principle to test the resistivity of thin-film thermoelectric materials. It consists of a test fixture and a control and test circuit system. The thin-film thermoelectric material sample to be tested is placed in the test fixture, which is connected to the control and test circuit system via probe leads. The control and test circuit system applies a pulsed current signal to two of the four probes in the test fixture via the probe leads and collects the voltage response signal between the other two probes. The pulsed current and voltage response signals are simultaneously input into a microcomputer, which displays the resistivity of the thin-film thermoelectric material at the measured location in real time on the microcomputer's display. This significantly reduces the impact of probe spacing and lateral probe tip movement on resistivity test results, ensuring test accuracy even when the test piece is small and the probes are positioned near the sample boundary. However, this patent fails to address the problem of continuous electrical testing and distinguishing good from defective products.

[0005] Patent publication number CN205941820U relates to a membrane switch electrical testing device, comprising a table, a base plate mounted on the top surface of the table, a support frame mounted on the top surface of the base plate, a detection plate mounted on the top surface of the support frame, a stand mounted on the top surface of the table, and a pressing cylinder mounted on the top of the stand. The cylinder rod of the pressing cylinder is provided with a base plate, the bottom of the base plate is provided with a support strip, the bottom of the support strip is provided with a needle plate, the needle plate is provided with a vertical pinhole, and a detection needle is provided in the vertical pinhole. The top surface of the detection plate is provided with a metal contact, and the detection plate is provided with an electrically connected communication interface. The utility model automatically presses the metal spring by the pressing cylinder, connects to the detection equipment through the communication interface, and determines the contact status of the membrane switch. It has a simple structure, high production efficiency, and a low missed detection rate. The electrical testing device of the aforementioned patent cannot effectively distinguish good from defective products.

[0006] Therefore, after the technological innovation, the keyboard circuit film has problems with alignment during the production process and / or the problem of poor bridge printing. The previous final test of the finished product is no longer sufficient. Although the two patents disclosed above can realize electrical testing, they cannot distinguish good products from defective products well during the electrical testing process. As a result, pressing and cutting are still required after the defective bridge is generated, resulting in waste in subsequent processes and greatly increasing the defective product rate. Summary of the Invention

[0007] In order to improve the yield rate of products and reduce ineffective production operations, the present application provides an electrical testing method, an electrical testing head and an apparatus for a semi-finished keyboard circuit film.

[0008] In a first aspect, the present application provides a method for electrically testing a semi-finished keyboard circuit film, using the following technical solution:

[0009] A method for electrically testing a semi-finished keyboard circuit film, the semi-finished keyboard circuit film comprising a bottom layer circuit located inside a base layer, a bridge insulating layer covering a portion of the bottom layer circuit, and a bridge circuit formed on the bridge insulating layer. The bottom layer circuit comprises a wiring terminal and a key electrode, at least one of the key electrodes being electrically connected to the wiring terminal via the bridge circuit. The method for electrically testing the semi-finished keyboard circuit film comprises:

[0010] Unwinding a semi-finished circuit film roll, wherein the semi-finished circuit film roll integrally includes a plurality of keyboard circuit film semi-finished products;

[0011] The semi-finished circuit film roll is intermittently rolled out so that the keyboard circuit film semi-finished product is aligned below the electrical measuring head and is subjected to electrical testing. The electrical measuring head includes a probe and a pressing block. The probe of the electrical measuring head is pressed one-to-one against the key electrodes, and the pressing block of the electrical measuring head is pressed one-to-many against the wiring terminals. An electrical signal is input to the pressing head, and the probe detects whether the key electrodes output an electrical signal.

[0012] Identifying whether the keyboard circuit film semi-finished product is a good product;

[0013] The keyboard circuit film semi-finished product after electrical testing and identification is rolled up.

[0014] By adopting the above technical solution, during the process of electrical testing of the semi-finished keyboard circuit film, the semi-finished keyboard circuit film roll is unwound in advance. When the semi-finished keyboard circuit film moves to the bottom of the electrical testing head, the electrical testing head is controlled to move vertically downward so that several probes are pressed one by one on the corresponding key electrodes, and at the same time, the pressing block is pressed on the wiring terminal of the semi-finished keyboard circuit film to be tested. At this time, an electrical signal is input to the pressing head to test whether there is an electrical signal output at the corresponding probe. When all probes have electrical signal output, it is a good product. When there is no electrical signal output at at least one probe, it is a defective product. The staff can clearly understand the location and number of defective keyboard circuits, and finally rewind the semi-finished keyboard circuit film after electrical testing and proceed to the next step of processing. Through this electrical testing method, the defective semi-finished keyboard circuit film can be eliminated and reworked, which reduces subsequent invalid processes and improves the finished product qualification rate of the keyboard circuit film.

[0015] Optionally, in the electrical measurement step, industrial camera recognition and material discharge speed calculation are used to identify whether the keyboard circuit on the inner side of the base layer is aligned with the electrical measurement head, and the keyboard circuit on the inner side of the base layer is controlled to be aligned with the electrical measurement head. When the semi-finished keyboard circuit film is rolled out and aligned below the electrical measurement head, the semi-finished circuit film stops moving, and the electrical measurement head is pressed down for electrical measurement.

[0016] By adopting the above technical solution, when the keyboard circuit is located directly below the electric measuring head, the industrial camera is used to track and locate it, and at the same time, the speed of the electric measuring head equipment through material discharge and the speed of movement of the keyboard circuit film semi-finished product are controlled. Precise control enables the electric measuring head to be accurately pressed on the keyboard circuit to be tested, and the probes contact the key electrodes one by one, and the pressing blocks contact the wiring terminals, so as to test whether the keyboard circuit is qualified. During the electrical testing process, the keyboard circuit film roll is controlled to stop unwinding, thereby ensuring accurate electrical testing by the electric measuring head.

[0017] Optionally, the electrical measuring head further comprises a syringe cylinder. In the identification step, when the keyboard circuit film semi-finished product is identified as a defective product, a hole is punched and marked around the defective circuit by the needle of the syringe cylinder.

[0018] By adopting the above technical solution, when the electrical measuring head presses down to measure the semi-finished keyboard circuit film, when it is identified that the currently measured keyboard circuit is defective, the piston rod of the syringe cylinder is extended by the air pump, so that the needle of the syringe cylinder punches and marks the periphery of the defective keyboard circuit film, thereby screening out the defective ones in advance in the stage of manufacturing the semi-finished keyboard circuit film, thereby reducing subsequent invalid processes.

[0019] Optionally, before the keyboard circuit film roll is rolled up after electrical testing, the defective keyboard circuit film with punch marks is not cut off but rolled up synchronously with the keyboard circuit of good quality. When the electrical testing head detects a defective product, an alarm is issued, otherwise no alarm is issued.

[0020] By adopting the above technical solution, when the electric measuring head detects a defective keyboard circuit during the process of electrically measuring the keyboard circuit film semi-finished product, the alarm will sound to remind the staff that the keyboard circuit film semi-finished product being measured is a defective product, and observe whether the side of the defective keyboard circuit semi-finished product is punched and marked, thereby further ensuring the production quality of the keyboard circuit in the later stage.

[0021] Optionally, in the electrical testing step, when the electrical testing head is pressed down for electrical testing, the electrical testing data and the testing status are displayed in real time through the testing status monitor.

[0022] By adopting the above technical solution, the electrical measurement data can be displayed in real time in front of the staff, so that the staff can accurately control the electrical measurement data, improve the accuracy of the electrical measurement, and ensure the effectiveness of the electrical measurement.

[0023] In a second aspect, the present application provides a method for manufacturing a keyboard circuit film, which adopts the following technical solution:

[0024] A method for manufacturing a keyboard circuit film, wherein the electrical testing method for a keyboard circuit film semi-finished product identifies good and bad keyboard circuit film semi-finished products from a roll of semi-finished circuit film obtained by electrical testing, cuts out good keyboard circuit film semi-finished products, folds the cut good keyboard circuit film semi-finished products in half and presses them together to form a keyboard circuit film, and opens a key frame hole in the keyboard circuit film, wherein the bottom circuit and the bridge circuit avoid a frame strip formed outside the key frame hole.

[0025] By adopting the above technical solution, it is known that during the electrical testing process, punch marks are made on the sides of the defective keyboard circuit film, and after the electrical testing of the semi-finished keyboard circuit film, the good and defective products are rolled up at the same time, and then the good and defective products in the semi-finished keyboard circuit film after electrical testing are separated, the defective semi-finished keyboard circuit film is reworked, and the good semi-finished keyboard circuit film is folded in half and pressed to form a keyboard circuit film and open key frame holes on the formed keyboard circuit film. This method reduces subsequent invalid processes and ensures the production quality of the keyboard circuit film.

[0026] In a third aspect, the present application provides an electric probe, which adopts the following technical solution:

[0027] An electrical testing head includes a mounting plate, on which are penetrated several probes for electrically testing keyboard circuits. A pressing block is also slidably provided on the mounting plate for contacting keyboard circuit wiring terminals and forming an electrical circuit with the probes, so as to provide electrical testing for a keyboard circuit film semi-finished product. The keyboard circuit film semi-finished product includes a bottom layer circuit located on the inner side of a base layer, a bridge insulating layer covering part of the bottom layer circuit, and a bridge circuit formed on the bridge insulating layer. The bottom layer circuit includes a wiring terminal and a key electrode. At least one of the key electrodes is connected to the wiring terminal via the bridge circuit. A plurality of keyboard circuit film semi-finished products are integrally included in a semi-finished circuit film roll.

[0028] By adopting the above technical solution, when the electrical testing head electrically tests the keyboard circuit, the probes are pressed one by one on the key electrodes, and at the same time the pressing block slides vertically downward and is pressed on the wiring terminal of the keyboard circuit, and an electrical signal is applied to the wiring terminal. The electrical signal passes through the underlying circuit and the bridge circuit to the corresponding probe part, that is, the key electrode. At this time, whether there is an electrical signal output at the probe part is tested. The circuit that can output the electrical signal indicates that the circuit is conductive and qualified, otherwise it is unqualified. When it is detected that all the circuits are in the conductive state, the keyboard circuit film semi-finished product is a good product. When it is detected that at least one circuit in the circuit is not conductive, it indicates that the keyboard circuit film semi-finished product is a defective product.

[0029] Optionally, two syringe cylinders are provided at both ends of the mounting plate, and the needles of the syringe cylinders slide on the mounting plate. A number of limit strips are evenly spaced on one side of the mounting plate that is in contact with the keyboard circuit film, and the needles of the syringe cylinders are used to punch marks around the defective circuit.

[0030] By adopting this technical solution, when the electrical probe detects a defective keyboard circuit, the piston rod of the syringe cylinder extends and punches a hole around the side of the corresponding defective keyboard circuit film semi-finished product, thereby marking the keyboard circuit film at that location as defective. By providing a limit bar made of silicone rubber, the mounting plate is less likely to damage the keyboard circuit film semi-finished product during the downward pressure of the electrical probe.

[0031] In a fourth aspect, the present application further provides an electrical testing device for a semi-finished keyboard circuit film, which adopts the following technical solution:

[0032] An electrical testing device for a semi-finished keyboard circuit film includes an electrical testing head. The electrical testing device also includes a workbench. Coil assemblies are provided at both ends of the workbench, one of the coil assemblies is used for unwinding, and the other coil assembly is used for rewinding. The electrical testing head is located between the two coil assemblies. The workbench is also provided with a control box for controlling the downward pressure of the electrical testing head.

[0033] By adopting the above technical solution, during the process of electrical testing of the semi-finished keyboard circuit film, the roll assembly for unwinding is unwound, the free end of the semi-finished keyboard circuit film roll moves on the upper surface of the workbench, and the side of the semi-finished keyboard circuit film printed with the circuit is set upward. Through the industrial camera, when the electrical testing head recognizes that the keyboard circuit is located directly below the electrical testing head, the control box controls the electrical testing head to press down precisely and realize electrical testing.

[0034] Optionally, a display screen and an alarm are also provided on the side wall of the workbench. When the electric measuring head detects a defective keyboard circuit, the alarm sounds an alarm. When the electric measuring head detects that the keyboard circuit is good, the display screen is used to mark a pass mark. The display screen and the alarm are both electrically connected to the control box.

[0035] By adopting the above technical solution, two display screens are provided during the electrical testing process, one of which is mainly used to display the electrical testing status and parameters in real time, and the other is mainly used to mark the pass or fail mark. When the electrical testing head detects that the keyboard circuit is not conductive, the alarm sounds an alarm and the electrical testing head punches a mark on the keyboard circuit film, and the display screen used for marking marks the fail mark. When the keyboard circuit is detected to be good, the alarm does not sound and the display screen used for marking marks the pass mark.

[0036] In summary, this application includes at least one of the following beneficial technical effects:

[0037] 1. The above method can effectively conduct electrical testing on the keyboard circuit film semi-finished products, and remove the defective keyboard circuit film semi-finished products for rework, thus ensuring the yield rate and reducing invalid processes.

[0038] 2. During the electrical testing process, defective products are effectively marked by punching marks, further ensuring the production quality of the keyboard circuit in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This diagram shows the layer structure of a semi-finished keyboard circuit film. A is a front view of the key area, B is a cross-sectional view of the key area, and C is a cross-sectional view of the frame area with the bridge circuit.

[0040] Figure 2 It is a schematic diagram of the overall structure of the electrical measuring equipment;

[0041] Figure 3 It is a schematic diagram of the overall structure of the electric measuring head;

[0042] Figure 4 This is a schematic diagram showing the overall structure of the probe and the pressing block at the electrical probe head;

[0043] Figure 5 This is a schematic diagram of the keyboard circuit film manufacturing process, where S1-S5 are used to show the electrical testing process of the keyboard circuit film semi-finished product, and S6-S8 are a schematic diagram of the process of manufacturing the keyboard circuit film semi-finished product after electrical testing;

[0044] Figure 6 This is a schematic diagram of the finished product of the keyboard circuit film.

[0045] Reference numerals:

[0046] 1. Base layer; 12. Bottom line; 121. Wire terminal; 122. Key electrode; 13. Bridge insulation layer; 14. Cross line;

[0047] 2. Workbench; 21. Rewinding assembly; 210. Coil shaft; 2101. Unwinding shaft; 2102. Rewinding shaft; 211. Motor; 2111. Unwinding motor; 2112. Rewinding motor; 22. Control box; 23. Electric probe; 24. Electric push cylinder; 25. Display screen; 26. Alarm;

[0048] 231, mounting plate; 232, probe; 233, pressing block; 234, limit strip; 235, syringe cylinder;

[0049] 3. Button frame hole; 31. Frame strip;

[0050] S1. Unwinding; S2. Electrical testing; S3. Identification of good and defective products; S4. Punching and marking; S5. Rewinding; S6. Cutting and distinguishing good and defective products; S7. Rework; S8. Folding and pressing. DETAILED DESCRIPTION

[0051] The following is combined with Figure 1-6This application is described in further detail.

[0052] In a first aspect, an embodiment of the present application discloses a keyboard circuit film semi-finished product.

[0053] Reference Figure 1 The keyboard circuit film semi-finished product includes a base layer 1, which is a transparent film layer. Silver paste is printed on the inner side of the base layer 1 to form a bottom line 12, and the bottom line 12 includes a wiring terminal 121 and a key electrode 122.

[0054] Reference Figure 1 Due to technological innovation, product upgrades, and increased keyboard functions, while the size of the keyboard frame remains unchanged, the density of the keyboard circuits has increased, requiring the covering of part of the bottom circuit 12 to form a bridge insulating layer 13. A bridge circuit is formed on the bridge insulating layer 13, and at least one key electrode 122 is electrically connected to the cable terminal 121 via the bridge circuit 14. This design alleviates the problem of high keyboard circuit printing density and insufficient layout space while ensuring good electrical characteristics.

[0055] Secondly, after the product upgrade, the setting of a large number of bridge circuits and the increase in the density of keyboard circuits have further reduced the product defective rate. It is known that the original product inspection method usually uniformly inspects the keyboard circuit film when it is finished. When the keyboard circuit film is damaged during the manufacturing process of the semi-finished product, it will lead to a large number of subsequent invalid processes, causing serious production capacity losses for the manufacturer.

[0056] In order to further improve the qualified rate of products and reduce the waste of invalid processes, the present application preferentially discloses an electrical testing device for a semi-finished keyboard circuit film.

[0057] Reference Figure 2 The electrical measuring equipment for the semi-finished keyboard circuit film includes a workbench 2, which is a rectangular table. A receiving assembly 21 for reeling and unreeling the semi-finished keyboard circuit film is provided at both ends of the rectangular table. The receiving assembly 21 includes a winding shaft 210 and a motor 211. The winding shaft 210 includes a feeding shaft 2101 and a receiving shaft 2102. The motor 211 includes a feeding motor 2111 and a receiving motor 2112. The feeding shaft 2101 is rotatably connected to the workbench 2. One end of the workbench 2 is used for unwinding materials, the rotating shaft of the unwinding shaft 2101 is coaxially fixed with the rotating shaft of the unwinding motor 2111, and the winding shaft 2102 is rotatably connected to the other end of the workbench 2 for winding materials, the rotating shaft of the winding motor 2112 is coaxially fixed with the rotating shaft of the winding shaft 2102, the unwinding shaft 2101 and the winding shaft 2102 are both pneumatic shafts, which are driven to rotate the rotating shaft of the unwinding motor 2111 to achieve unwinding, and driven to rotate the rotating shaft of the winding motor 2112 to achieve winding.

[0058] Reference Figure 2 and Figure 3 An electric measuring head 23 is also provided in the middle of the workbench 2. A control box 22 for controlling the electric measuring head 23 to press down and perform electrical measurement is also provided on the workbench 2. The control box 22 is mainly a microcomputer, which is mainly used to control various electrical equipment on the workbench 2. An electric push cylinder 24 is provided between the control box 22 and the electric measuring head 23. The base of the electric push cylinder 24 is fixed on the bottom side wall of the control box 22, and the piston rod of the electric push cylinder 24 is fixed on the electric measuring head 23.

[0059] Reference Figure 2 and Figure 3 Two display screens 25 and an alarm 26 are also provided on the side wall of the workbench 2. The display screens 25 and the alarm 26 are both electrically connected to the control box 22. One of the display screens 25 is mainly used to display the electrical measurement data and electrical measurement status of the electrical measuring head 23 in real time, and the other display screen 25 is mainly used to display the mark of whether the test is passed. When the tested product is qualified, a PASS mark will appear on the display screen 25, otherwise a cross mark will appear on the display screen 25, and the alarm 26 will sound an alarm to remind the staff that the keyboard circuit film semi-finished product tested at this time is a defective product.

[0060] Thirdly, in order to more accurately perform electrical testing on the semi-finished product of the keyboard circuit film, the present application also discloses an electrical testing head.

[0061] Reference Figure 2 and Figure 4 The electrical measuring head 23 disclosed here is the electrical measuring head 23 used in the above-mentioned electrical measuring equipment. The electrical measuring head 23 includes a mounting plate 231, a probe 232 and a pressing block 233. The electrical measuring head 23 is arranged below the control box 22. The mounting plate 231 is a rubber plate. The mounting plate 231 slides vertically above the workbench 2. The probe 232 and the pressing block 233 are both arranged on the mounting plate 231.

[0062] Reference Figure 2 and Figure 4 Several probes 232 are distributed according to the layout of existing keyboard circuits. Each key electrode 122 is equipped with a corresponding probe 232. Probes 232 are vertically arranged and fixed to the bottom surface of the mounting plate 231. Probes 232 are electrically connected to the control box 22 via wires. A pressing block 233 is driven by a micro-cylinder and slides vertically on the bottom surface of the mounting plate 231. The pressing block 233 is a metal block and is electrically connected to the control box 22 via wires.

[0063] Reference Figure 2 and Figure 4During the electrical measurement process, it is known that an industrial camera is also provided below the control box 22, and the industrial camera is electrically connected to the control box 22. When the free end of the keyboard circuit film roll moves along the surface of the workbench 2, the control box 22 calculates the unwinding speed of the keyboard circuit film roll and uses the industrial camera to track and locate the position, so that a single keyboard circuit film semi-finished product can always be accurately located directly below the mounting plate 231. At this time, the control box 22 controls the keyboard circuit film roll to stop unwinding and drives the mounting plate 231 to press down vertically. A limit strip 234 is provided on the side of the mounting plate 231 facing the keyboard circuit film semi-finished product. The limit strip 234 is a silicone rubber strip, so that the keyboard circuit film is unlikely to be directly damaged during the downward pressure of the mounting plate 231. When the mounting plate 231 is pressed down, the mounting plate 231 stops pressing down until several probes 232 on the mounting plate 231 contact the corresponding key electrodes 122 and the pressing block 233 contacts the corresponding cable terminal 121.

[0064] Reference Figure 2 and Figure 4 At this time, the control box 22 inputs an electrical signal to the pressing head through the wire to test whether there is an electrical signal output at the corresponding probe 232. When all the probes 232 have electrical signal output, it means that the keyboard circuit film semi-finished product tested at this time is qualified. When at least one probe 232 has no electrical signal output, it is a defective product.

[0065] Reference Figure 2 and Figure 4 Two needle cylinders 235 are installed at both ends of the electrical measuring head 23. The piston rod ends of the needle cylinders 235 are spike-shaped, and the needles of the needle cylinders 235 slide on the mounting plate 231. When the electrical measuring head 23 detects that the keyboard circuit film semi-finished product is defective, the needles of the needle cylinders 235 are driven to slide vertically and punch holes in the surface of the keyboard circuit film semi-finished product being measured, marking it as a defective product.

[0066] In the fourth aspect, it is preferred to use the electrical testing equipment and the electrical testing head 23 disclosed above to perform electrical testing on the above-mentioned novel keyboard circuit film semi-finished product. The specific electrical testing method of the keyboard circuit film semi-finished product is as follows:

[0067] Reference Figure 2 It is known that a semi-finished keyboard circuit film roll is integrally formed with a plurality of keyboard circuit film semi-finished products. When the plurality of keyboard circuit film semi-finished products on the semi-finished keyboard circuit film roll are electrically tested one by one;

[0068] Reference Figure 2 and Figure 5First, step S1 of unwinding is performed. The rotating shaft of the motor 211 and the winding shaft 210 are driven to rotate synchronously through the control box 22 in advance to unwind the semi-finished keyboard circuit film roll. The unwinding speed is controlled in real time by the control box 22.

[0069] Reference Figure 2 and Figure 4 During the unwinding process, the free end of the film roll is placed on the workbench 2 and moved from one end to the other. During the movement, when the keyboard circuit film semi-finished product to be tested is located below the test head 23, the industrial camera located on the mounting plate 231 performs image tracking and recognition of the film roll below. At the same time, the control box 22 controls the unwinding speed so that the single keyboard circuit semi-finished product to be tested is aligned directly below the mounting plate 231.

[0070] Reference Figure 1 、 Figure 3 、 Figure 4 and Figure 5 After precise alignment, step S2 electrical testing is performed. Unwinding of the semi-finished keyboard circuit film roll is stopped in advance, and the control box 22 controls the piston rod of the electric push cylinder 24 to move vertically downward until the mounting plate 231 presses down vertically on the semi-finished keyboard circuit film. After pressing down, the multiple probes 232 contact the keyboard electrodes one by one, and the pressing block 233 contacts the cable terminals 121 on the keyboard circuit. The control box 22 inputs an electrical signal to the pressing block 233 through a wire, thereby testing whether the multiple probes 232 are outputting electrical signals.

[0071] Reference Figure 4 and Figure 5 While conducting the electrical test, step S3 is performed to identify good and defective products. When all the probes 232 have electrical signal outputs, it indicates that the tested keyboard circuit film semi-finished product is a good product. When at least one probe 232 has no electrical signal output, it indicates that it is a defective product.

[0072] Reference Figure 2 、 Figure 4 and Figure 5 The known electrical testing equipment is equipped with two display screens 25 and an alarm 26. During the electrical testing process, if the keyboard circuit film semi-finished product under test is qualified, the alarm 26 does not sound, and one display screen 25 displays the electrical test data in real time. The other display screen 25 displays the "Pass" mark, indicating that the product has passed. At this time, the electrical testing head 23 rises, and the semi-finished keyboard circuit film roll continues to unwind, and the next keyboard circuit film semi-finished product is subjected to electrical testing.

[0073] Reference Figure 2 、 Figure 4 and Figure 5If the keyboard circuit film semi-finished product under test is defective, step S4 is performed to punch a mark, causing a cross to appear on the corresponding display screen 25, indicating that the product is unqualified. At the same time, the alarm 26 is controlled by the control box 22 and sounds an alarm to inform the staff that the keyboard circuit film semi-finished product under test is defective. At the same time, the syringe cylinder 235 of the mounting plate 231 is controlled by the control box 22. Under the action of the external air pump, the piston rod of the syringe cylinder 235 extends vertically downward and strikes the side of the keyboard circuit film semi-finished product, thereby punching a mark on the side of the keyboard circuit film semi-finished product.

[0074] Reference Figure 1 、 Figure 5 and Figure 3 At this time, there will be both good keyboard circuit film semi-finished products and bad keyboard circuit film semi-finished products on the entire base film 1. After the electrical testing step is completed, step S5 is performed. At this time, the electrical testing head 23 rises and causes the entire base film 1 to be rolled up.

[0075] Reference Figure 5 After winding, a semi-finished keyboard circuit film roll after electrical testing is obtained. According to the fifth aspect, the present application also discloses a method for manufacturing a keyboard circuit film to obtain a finished keyboard circuit film.

[0076] Reference Figure 5 The specific manufacturing method of the keyboard circuit film is to perform step S6 to separate good products and bad products in advance, cut out the good products and bad products in the semi-finished keyboard circuit film roll after electrical testing, perform step S7 to rework the cut bad products, rework the bad keyboard circuit film semi-finished products, and perform step S8 to fold and press the cut good products, so as to form the required keyboard circuit film by folding and pressing the cut good keyboard circuit film semi-finished products in half.

[0077] Reference Figure 1 、 Figure 5 and Figure 6 Finally, a key frame hole 3 is opened on the keyboard circuit film formed after folding, so that the required finished keyboard circuit film is formed, and the bottom line 12 and the bridge line 14 are formed on the frame strip 31 outside the key frame hole 3. At this time, the finished keyboard circuit film is formed.

[0078] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for manufacturing a keyboard circuit film, characterized in that: include: Unwinding a semi-finished circuit film roll, wherein the semi-finished circuit film roll integrally includes a plurality of keyboard circuit film semi-finished products; The keyboard circuit film semi-finished product comprises a bottom layer circuit (12) located inside a base layer (1), a bridge insulating layer (13) covering a portion of the bottom layer circuit (12), and a bridge circuit (14) formed on the bridge insulating layer (13); the bottom layer circuit (12) comprises a wiring terminal (121) and a key electrode (122); at least one of the key electrodes (122) is connected to the wiring terminal (121) via the bridge circuit (14); The semi-finished circuit film roll is intermittently rolled out so that the keyboard circuit film semi-finished product is aligned below the electric measuring head (23) for electric measuring. The electric measuring head (23) includes a mounting plate (231), and a plurality of probes (232) for electric measuring the keyboard circuit are provided on the mounting plate (231). A pressing block (233) for contacting the keyboard circuit wiring terminal (121) and forming an electric circuit with the probe (232) is also slidably provided on the mounting plate (231). The mounting plate (231) of the electric measuring head (23) is vertically pressed down on the keyboard circuit film semi-finished product. The pressing block (233) of the electric measuring head (23) is pressed one-to-many on the wiring terminal (121) and inputs an electric signal to the pressing block (233). The probe ( 232) are pressed one-to-one on the key electrode (122) to detect the electrical signal output of the key electrode (122); two syringe cylinders (235) are provided at both ends of the mounting plate (231), and the needles of the syringe cylinders (235) slide on the mounting plate (231), and a plurality of limit strips (234) are evenly spaced on one side of the mounting plate (231) that is in contact with the keyboard circuit film, and the limit strips (234) are silicone rubber strips. The mounting plate (231) is pressed down until the plurality of probes (232) on the mounting plate (231) are in contact with the corresponding key electrodes (122), and the pressing block (233) is in contact with the corresponding cable terminal (121), and the mounting plate (231) stops pressing down; Identifying whether the keyboard circuit film semi-finished product is a good product; in the identification step, when the keyboard circuit film semi-finished product is identified as a defective product, punching marks are made on the periphery of the defective circuit by the needle of the syringe cylinder (235); Raising the electrical measuring head (23) and rolling up the semi-finished keyboard circuit film after electrical measurement and identification; Good and bad keyboard circuit film semi-finished products are identified from the semi-finished circuit film roll obtained by electrical testing, and the good keyboard circuit film semi-finished products are cut out. The cut good keyboard circuit film semi-finished products are folded in half and pressed together to form a keyboard circuit film, and a key frame hole (3) is opened on the keyboard circuit film, and the bottom circuit (12) and the bridge circuit (14) avoid the frame strip (31) formed outside the key frame hole (3).

2. The manufacturing method according to claim 1, wherein: In the electrical measurement step, industrial camera recognition and material discharge speed calculation are used to identify whether the keyboard circuit inside the base layer (1) is aligned with the electrical measurement head (23), and the keyboard circuit inside the base layer (1) is controlled to be aligned with the electrical measurement head (23). When the keyboard circuit film semi-finished product is rolled out and aligned below the electrical measurement head (23), the semi-finished circuit film stops moving, and at this time the electrical measurement head (23) is pressed down for electrical measurement.

3. The manufacturing method according to claim 1, wherein: Before the keyboard circuit film is rolled up after electrical testing, the defective keyboard circuit film with punch marks is not cut off but is rolled up synchronously with the keyboard circuit of good quality. When the electrical testing head (23) detects a defective product, an alarm is issued, otherwise no alarm is issued.

4. The manufacturing method according to claim 1, wherein: In the electrical measurement step, when the electrical measurement head (23) is pressed down for electrical measurement, the electrical measurement data and the detection status are displayed in real time through the detection status monitor.

5. An electrical testing device for a semi-finished keyboard circuit film, characterized in that: The electric measuring head (23) is included, and the electric measuring device further includes a workbench (2), and coil components are provided at both ends of the workbench (2), one of the coil components is used for unwinding, and the other coil component is used for rewinding, and the electric measuring head (23) is located between the two coil components. A control box (22) for controlling the electric measuring head (23) to press down and measure is also provided on the workbench (2); The electrical measuring head comprises a mounting plate (231), on which a plurality of probes (232) for electrically measuring a keyboard circuit are provided, and a pressing block (233) for contacting a keyboard circuit wiring terminal (121) and forming an electrical circuit with the probes (232) is also slidably provided on the mounting plate (231) for forming an electrical circuit with the probes (232) for electrically measuring a keyboard circuit film semi-finished product, wherein the keyboard circuit film semi-finished product comprises a bottom line (12) located on the inner side of a base layer (1), a bridge insulating layer (13) covering a portion of the bottom line (12), and a bridge line (14) formed on the bridge insulating layer (13), wherein the bottom line (12) comprises a wiring terminal (121) and a key electrode (122), and at least one of the key electrodes (122) is connected to the wiring terminal (121) via the bridge line (14). 21), a plurality of the keyboard circuit film semi-finished products are integrally included in a semi-finished circuit film roll; two syringe cylinders (235) are provided at both ends of the mounting plate (231), the needles of the syringe cylinders (235) slide on the mounting plate (231), and a plurality of limit strips (234) are evenly spaced on one side of the mounting plate (231) that is in contact with the keyboard circuit film, the limit strips (234) being silicone rubber strips, the mounting plate (231) is pressed down until a plurality of the probes (232) on the mounting plate (231) are in contact with the corresponding key electrodes (122), and the pressing block (233) is in contact with the corresponding wiring terminal (121), the mounting plate (231) stops pressing down, and the needles of the syringe cylinders (235) are used to punch marks on the peripheral side of the defective circuit.

6. The electrical testing device for the keyboard circuit film semi-finished product according to claim 5, characterized in that: A display screen (25) and an alarm (26) are also provided on the side wall of the workbench (2). When the electrical measuring head (23) detects a defective keyboard circuit, the alarm (26) sounds an alarm. When the electrical measuring head (23) detects that the keyboard circuit is a good product, the display screen (25) is used to mark a passing mark. The display screen (25) and the alarm (26) are both electrically connected to the control box (22).

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