Switching structure of flexible circuit board

Abstract

The utility model discloses a switch structure of flexible circuit board can reduce manufacturing cost and overall thickness, it includes by the FPC function board, double -faced adhesive isolation layer and panel layer who stack in order from below to above, the panel layer is pasted in the upper surface of FPC function board through double -faced adhesive isolation layer, the lower surface of panel layer is provided with silver paste switch contact point in the corresponding product pressing switch preset position, double -faced adhesive isolation layer is provided with the through -hole in the position corresponding silver paste switch contact point, the upper surface of FPC function board is provided with the upper circuit pattern in the position corresponding through -hole, its inside is provided with the interconnection conductive circuit, and the end of FPC function board is provided with the plug -in end of external connection, when silver paste switch contact point and upper circuit pattern contact, interconnection conductive circuit is connected.

Description

Technical Field

[0001] This utility model belongs to the field of flexible circuit board technology, and specifically refers to a switch structure for a flexible circuit board. Background Technology

[0002] Flexible printed circuits (FPCs) are circuit boards that use a flexible insulating substrate (such as polyimide) as a carrier, and form conductive circuit patterns on the surface of the substrate through processes such as etching, to achieve electronic signal transmission. Their core characteristics are excellent flexibility and bendability, allowing them to adapt to complex installation spaces, while also offering advantages such as thinness and flexible structure.

[0003] The existing flexible circuit board push-button switch structure usually includes a dome switch and a metal foil reinforcement layer. The pressing and rebound process requires a large space, which makes the product generally thicker and unsuitable for the demand for thinner and lighter products. At the same time, the materials and bonding processes related to the metal foil reinforcement layer are relatively expensive, time-consuming and labor-intensive, which also makes the product thicker and loses some of its flexibility. Utility Model Content

[0004] The main objective of this invention is to provide a switching structure for a flexible circuit board, which solves the problems existing in the prior art and can reduce manufacturing costs and overall thickness.

[0005] To achieve the above objectives, the solution of this utility model is: A switch structure for a flexible circuit board comprises, from bottom to top, an FPC functional board, a double-sided adhesive insulating layer, and a panel layer. The panel layer is bonded to the upper surface of the FPC functional board via the double-sided adhesive insulating layer. A silver paste switch contact is provided on the lower surface of the panel layer at a preset position corresponding to the product's push-button switch. A through-hole is provided on the double-sided adhesive insulating layer at the position corresponding to the silver paste switch contact. An upper circuit pattern is provided on the upper surface of the FPC functional board at the position corresponding to the through-hole, and interconnecting conductive lines are provided inside the upper circuit pattern. An external connection connector is provided at the end of the FPC functional board. When the silver paste switch contact contacts the upper circuit pattern, the interconnecting conductive lines are connected.

[0006] The upper surface of the panel layer is the user interface, and icons are printed according to product requirements.

[0007] The upper circuit pattern is a pair of separate electrodes, which achieve bridging and conduction when they simultaneously contact the silver paste switch contacts.

[0008] The FPC functional board includes a substrate, and front and back circuits printed on both sides thereon; the upper circuit pattern is part of the front circuit.

[0009] Preferably, the material of the substrate is polyimide.

[0010] The lower surface of the FPC functional board is provided with an adhesive backing layer.

[0011] Preferably, the adhesive backing layer is acrylic tape or PET double-sided tape.

[0012] The upper surface of the panel layer is printed with button markings corresponding to the positions of the silver paste switch contacts.

[0013] After adopting the above technical solution, the present invention has the following technical effects: When a finger presses the panel layer, the silver paste switch contact moves downward and contacts the upper circuit pattern inside the through hole of the double-sided adhesive isolation layer, thereby closing the interconnected conductive circuit. The signal can be transmitted to the plug-in terminal through the interconnected conductive circuit of the FPC functional board, ultimately realizing the function of the push switch. While ensuring complete functionality, this invention does not include metal foil reinforcement layers such as copper foil and aluminum foil, resulting in a simpler lamination structure, a thinner and more flexible product. It also simplifies the structure, saves metal foil materials and their corresponding bonding processes, reduces manufacturing costs and overall thickness, and is particularly suitable for lightweight equipment with strict requirements on thickness and cost. Attached Figure Description

[0014] Figure 1 This is an exploded view of a specific embodiment of the present utility model.

[0015] Figure 2 This is a schematic diagram of the layer structure of a specific embodiment of the present invention.

[0016] Explanation of icon numbers: 100-FPC functional board; 110-substrate; 120-front circuitry; 130-back circuitry; 101-top circuit pattern; 102-plug terminal; 200 - Double-sided adhesive release layer; 201 - Through hole; 300 - Panel layer; 301 - Button labels; 400-Silver Paste Switch Contacts; 500 - Adhesive backing layer. Detailed Implementation

[0017] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0018] refer to Figure 1 , Figure 2 As shown, this utility model discloses a switch structure for a flexible circuit board, comprising an FPC functional board 100, a double-sided adhesive isolation layer 200, and a panel layer 300 stacked sequentially from bottom to top. The panel layer 300 is attached to the upper surface of the FPC functional board 100 by a double-sided adhesive release layer 200; The lower surface of panel layer 300 is provided with silver paste switch contacts 400 corresponding to the preset position of the product's push switch; A through hole 201 is provided on the double-sided adhesive release layer 200 at the position corresponding to the silver paste switch contact 400; The upper surface of the FPC functional board 100 is provided with an upper circuit pattern 101 corresponding to the position of the through hole 201, and interconnecting conductive lines are provided inside it. The end of the FPC functional board 100 is provided with a plug-in terminal 102 for external connection. After the panel layer 300 is pressed, the silver paste switch contact 400 contacts the upper circuit pattern 101 to connect the interconnect conductive line, thereby allowing the signal to be transmitted to the plug terminal 102 through the interconnect conductive line of the FPC functional board 100.

[0019] Through the above solution, when the finger presses the panel layer 300, the silver paste switch contact 400 can move down and contact the upper circuit pattern 101 in the through hole 201 of the double-sided adhesive isolation layer 200, thereby realizing the closure of the interconnected conductive line. The signal can be transmitted to the plug terminal 102 through the interconnected conductive line of the FPC functional board 100, and finally realize the function of the press switch. Under the premise of ensuring complete functionality, this invention does not include metal foil reinforcement layers such as copper foil and aluminum foil, the lamination structure is simpler, the product is thinner and more flexible, and the simplified structure is achieved, saving metal foil materials and their corresponding bonding processes, reducing manufacturing costs and overall thickness. It is particularly suitable for lightweight equipment with strict requirements on thickness and cost.

[0020] The following are specific embodiments of the present invention.

[0021] The upper surface of the aforementioned panel layer 300 is the user interface, and icons can be printed according to product requirements.

[0022] The circuit pattern 101 described above is a pair of separate electrodes. When the pair of electrodes are in contact with the silver paste switch contact 400 at the same time, they achieve bridging and conduction.

[0023] The aforementioned FPC functional board 100 includes a substrate 110, and front circuitry 120 and back circuitry 130 printed on its front and back sides; the upper circuit pattern 101 is part of the front circuitry 120.

[0024] Furthermore, the material of the substrate 110 is polyimide.

[0025] The lower surface of the aforementioned FPC functional board 100 is provided with an adhesive layer 500, which allows the switch structure of the flexible circuit board to be directly attached to the device for installation without the need for additional fasteners.

[0026] Furthermore, the aforementioned adhesive layer 500 is a high-adhesion acrylic tape or a PET (polyethylene terephthalate) double-sided adhesive.

[0027] This invention involves printing conductive silver paste onto the panel layer 300 to form the aforementioned silver paste switch contacts, which are then cured to form a stable conductive circuit. The upper surface of the panel layer 300 is printed with button markings 301 corresponding to the positions of the silver paste switch contacts 400.

[0028] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A switching structure for a flexible circuit board, characterized in that: It includes, from bottom to top, an FPC functional board, a double-sided adhesive release layer, and a panel layer; The panel layer is bonded to the upper surface of the FPC functional board via the double-sided adhesive release layer; The lower surface of the panel layer is provided with silver paste switch contacts at the preset positions corresponding to the product's push switch. The double-sided adhesive isolation layer has through holes corresponding to the positions of the silver paste switch contacts; The upper surface of the FPC functional board is provided with an upper circuit pattern corresponding to the position of the through hole, and interconnected conductive lines are provided inside. The end of the FPC functional board is provided with a plug-in terminal for external connection. When the silver paste switch contact comes into contact with the upper circuit pattern, the interconnected conductive line is connected.

2. The switching structure of the flexible circuit board as described in claim 1, characterized in that: The upper surface of the panel layer is the user interface, and icons are printed according to product requirements.

3. The switching structure of the flexible circuit board as described in claim 1, characterized in that: The upper circuit pattern is a pair of separate electrodes, which achieve bridging and conduction when they simultaneously contact the silver paste switch contacts.

4. The switching structure of the flexible circuit board as described in claim 1, characterized in that: The FPC functional board includes a substrate, and front and back circuits printed on both sides thereon; the upper circuit pattern is part of the front circuit.

5. The switching structure of the flexible circuit board as described in claim 4, characterized in that: The substrate is made of polyimide.

6. The switching structure of the flexible circuit board as described in claim 1, characterized in that: The lower surface of the FPC functional board is provided with an adhesive backing layer.

7. The switching structure of the flexible circuit board as described in claim 6, characterized in that: The adhesive backing is acrylic tape or PET double-sided tape.

8. The switching structure of the flexible circuit board as described in claim 1, characterized in that: The upper surface of the panel layer is printed with button markings corresponding to the positions of the silver paste switch contacts.

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