Membrane switch button with PCB and FPC flat cable combined in soft and hard mode

Abstract

The utility model relates to the technical field of membrane switches, and discloses a rigid-flex membrane switch button of a PCB and an FPC flat cable, which comprises a substrate, the upper surface of the substrate is provided with a printed circuit board, and the printed circuit board is provided with a flexible circuit board; the rigid-flex board has excellent characteristics of both the PCB and the FPC, can be folded and bent, can be welded with complex components, has longer service life, is not easy to break, oxidize and fall off compared with a flat cable, has better reliability and can adapt to a harsh application environment, the performance of the product is improved by combining the flexible board FPC and the rigid board PCB, and the production cost is reduced. According to the circuit board, the number of welding components is reduced, the internal space of the product is saved, the overall cost of the product is reduced, a connecting circuit can be arranged in the inner layer of the circuit board, and therefore the occupied space of the circuit board is reduced, the design of an electronic product can be more compact, and more functions can be achieved in small equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of membrane switches, in particular to a membrane switch button that combines a PCB and an FPC cable in a soft and hard manner. Background Art

[0002] The membrane switch is an operating system that integrates key functions, indicating elements, and instrument panels. It consists of four parts: panel, upper circuit, isolation layer, and lower circuit. When the membrane switch is pressed, the contacts of the upper circuit deform downward and contact and conduct with the plates of the lower circuit. When the finger is released, the contacts of the upper circuit rebound, the circuit is disconnected, and the loop triggers a signal. The membrane switch has a rigorous structure, beautiful appearance, and good sealing.

[0003] When choosing FPC and PCB for membrane switches in the prior art, FPC will be used for touch button switches that have wires that need to be bent, are miniaturized, thin, and have simple components and few components, while PCB will be selected for touch button switches that do not need to be bent, require higher hardness and strength, and have more stable performance. When customers need to meet all the requirements at the same time, more processes are implemented by PCB, welding connectors and FPC cables. Therefore, we need to propose a membrane switch button that combines soft and hard PCB and FPC cables. Utility Model Content

[0004] The purpose of the utility model is to provide a membrane switch button that combines a soft and hard PCB and an FPC cable, which improves product performance, reduces welding components, saves internal space of the product, and reduces the overall cost of the product by combining a soft board FPC and a hard board PCB, so as to realize more functions and solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the utility model provides the following technical solution: a membrane switch button with a combination of PCB and FPC cable, comprising a substrate, a printed circuit board is arranged on the upper surface of the substrate, and a flexible circuit board is arranged on the printed circuit board;

[0006] The printed circuit board comprises a lower circuit layer, an isolation layer is bonded to the upper surface of the lower circuit layer, an upper circuit layer is bonded to the upper surface of the isolation layer, a panel layer is arranged on the upper surface of the upper circuit layer, and a pressing groove is opened on the upper surface of the lower circuit layer;

[0007] The flexible circuit board comprises a lead wire, one end of the lead wire is provided with a pressing part, the pressing part is arranged inside a pressing groove, and the other end of the lead wire is provided with a plug.

[0008] Preferably, an adhesive layer is bonded to the lower surface of the lower circuit layer, and the adhesive layer is bonded to the upper surface of the substrate. The upper surface of the substrate is provided with a bottom hole for the lead wire to pass through.

[0009] Preferably, a sealing frame is bonded to the upper surface of the substrate, and a plurality of groups of plug-in blocks are integrally formed on the upper surface of the substrate.

[0010] Preferably, it also includes a guard plate, wherein the four ends of the inner cavity of the guard plate are integrally formed with reinforcement parts, and the lower surface of each group of reinforcement parts is provided with a socket for the plug-in block to be inserted.

[0011] Preferably, the upper surface of the panel layer is provided with pressure-sensitive switches and multiple groups of display elements, and the multiple groups of display elements are arranged at equal intervals.

[0012] Preferably, a switch button is provided on the upper surface of the guard plate, and the switch button is provided directly above the pressure-sensitive switch. A plurality of groups of transparent parts are provided on the upper surface of the guard plate, and the plurality of groups of transparent parts respectively match the plurality of groups of display elements.

[0013] Preferably, a primer is bonded to the lower surface of the substrate, a release paper is bonded to the lower surface of the primer, and a through hole for the lead wire to pass through is formed on the lower surface of the primer.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model mainly achieves the cooperation between the printed circuit board and the flexible circuit board. The hard-soft combination board has the excellent characteristics of both PCB and FPC. It can be folded and bent, and complex components can be welded. At the same time, it has a longer life than the cable, is not easy to break, oxidize and fall off. The product has better reliability and can adapt to more stringent application environments. By combining the soft board FPC and the hard board PCB, the product performance is improved, the welding components are reduced, the internal space of the product is saved, and the overall cost of the product is reduced. The circuit board can build the connection line into the inner layer of the board, thereby reducing the space occupied by the circuit board, which makes the design of electronic products more compact and helps to realize more functions in small devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the internal structure of the guard plate of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of a printed circuit board and a flexible circuit board of the utility model.

[0019] In the figure: 1. substrate; 2. base glue; 3. protective plate; 4. switch button; 5. transparent part; 6. plug-in block; 7. sealing frame; 8. reinforcement part; 9. jack; 10. printed circuit board; 101. adhesive layer; 102. lower circuit layer; 103. pressing groove; 104. isolation layer; 105. upper circuit layer; 106. panel layer; 107. pressure-sensitive switch; 108. display element; 11. flexible circuit board; 111. lead wire; 112. pressing part; 113. plug; 12. bottom hole. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-3 The utility model provides a technical solution: a membrane switch button with a combination of PCB and FPC cable, comprising a substrate 1, a printed circuit board 10 is arranged on the upper surface of the substrate 1, and a flexible circuit board 11 is arranged on the printed circuit board 10;

[0022] The printed circuit board 10 comprises a lower circuit layer 102, an isolation layer 104 is bonded to the upper surface of the lower circuit layer 102, an upper circuit layer 105 is bonded to the upper surface of the isolation layer 104, a panel layer 106 is arranged on the upper surface of the upper circuit layer 105, and a pressing groove 103 is opened on the upper surface of the lower circuit layer 102;

[0023] The flexible circuit board 11 includes a lead wire 111 , one end of the lead wire 111 is provided with a pressing portion 112 , the pressing portion 112 is arranged inside the pressing groove 103 , and the other end of the lead wire 111 is provided with a plug 113 .

[0024] The lower surface of the lower circuit layer 102 is bonded with an adhesive layer 101, and the adhesive layer 101 is bonded to the upper surface of the substrate 1. The upper surface of the substrate 1 is provided with a bottom hole 12 for the lead wire 111 to pass through. The adhesive layer 101 facilitates the fixation of the lower circuit layer 102 and prevents the lower circuit layer 102 from shaking on the substrate 1, thereby ensuring the service life of the membrane switch.

[0025] A sealing frame 7 is bonded to the upper surface of the substrate 1, and a plurality of plug-in blocks 6 are integrally formed on the upper surface of the substrate 1. The outer cross-section of the sealing frame 7 is the same as the inner cross-section of the protective plate 3. The sealing frame 7 can be embedded in the inner cavity of the protective plate 3, thereby improving the sealing between the substrate 1 and the protective plate 3.

[0026] It also includes a guard plate 3, the four ends of the inner cavity of the guard plate 3 are integrally formed with reinforcement parts 8, and the lower surface of each group of reinforcement parts 8 is provided with a socket 9 for the insertion of the plug block 6. The reinforcement part 8 improves the overall strength of the guard plate 3, thereby preventing the guard plate 3 from being damaged by impact and increasing the service life of the guard plate 3. At the same time, the base plate 1 is matched with the socket 9 on the reinforcement part 8 through the plug block 6, thereby facilitating the rapid installation of the base plate 1 and the guard plate 3.

[0027] The upper surface of the panel layer 106 is provided with a pressure switch 107 and multiple groups of display elements 108. The multiple groups of display elements 108 are arranged at equal intervals. The pressure switch 107 is used to sense the pressure applied to the switch button 4, so that the display element 108 can display the detection status of the membrane switch.

[0028] A switch button 4 is provided on the upper surface of the guard plate 3, and the switch button 4 is provided directly above the pressure-sensitive switch 107. A plurality of groups of transparent parts 5 are provided on the upper surface of the guard plate 3, and the plurality of groups of transparent parts 5 are respectively matched with the plurality of groups of display elements 108. The switch button 4 is used to facilitate the detection of the fit between the printed circuit board 10 and the flexible circuit board 11. At the same time, the hard-soft combination board has excellent characteristics of both PCB and FPC, and can be folded and bent, and complex components can be welded.

[0029] The lower surface of the substrate 1 is bonded with a base glue 2, and the lower surface of the base glue 2 is bonded with a release paper. The lower surface of the base glue 2 is provided with a through hole for the lead wire 111 to pass through. The base glue 2 is 3M glue with high bonding strength to ensure that the membrane switch is not easy to fall off after installation. At the same time, the release paper is easy to tear, so that the membrane switch can be installed in different positions.

[0030] Draw the circuit and shape of the hard-flex board, decompose it into two parts, the flexible circuit board 11 and the printed circuit board 10, process, plan and design them respectively, then arrange the flexible circuit board 11 production line to produce the required flexible circuit board 11, and the printed circuit board 10 production line to produce the printed circuit board 10. After the flexible circuit board 11 and the printed circuit board 10 are made respectively, the flexible circuit board 11 and the printed circuit board 10 are seamlessly pressed together by a pressing machine as required, and then after a series of detailed links, the hard-flex board is finally made. Finally, the hard-flex board is installed between the substrate 1 and the protective plate 3 to complete the production of the membrane switch, and the product can be packaged after testing.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A membrane switch key with a combination of PCB and FPC cable, comprising a substrate (1), characterized in that: A printed circuit board (10) is arranged on the upper surface of the substrate (1), and a flexible circuit board (11) is arranged on the printed circuit board (10); The printed circuit board (10) comprises a lower circuit layer (102), an isolation layer (104) is bonded to the upper surface of the lower circuit layer (102), an upper circuit layer (105) is bonded to the upper surface of the isolation layer (104), a panel layer (106) is provided on the upper surface of the upper circuit layer (105), and a pressing groove (103) is provided on the upper surface of the lower circuit layer (102); The flexible circuit board (11) comprises a lead wire (111), one end of the lead wire (111) is provided with a pressing portion (112), the pressing portion (112) is arranged inside the pressing groove (103), and the other end of the lead wire (111) is provided with a plug (113).

2. A membrane switch key with a combination of hard and soft PCB and FPC cable according to claim 1, characterized in that: The lower surface of the lower circuit layer (102) is bonded with an adhesive layer (101), and the adhesive layer (101) is bonded to the upper surface of the substrate (1). The upper surface of the substrate (1) is provided with a bottom hole (12) for the lead wire (111) to pass through.

3. The membrane switch key with a combination of PCB and FPC cable and hard and soft connection according to claim 2, characterized in that: A sealing frame (7) is bonded to the upper surface of the substrate (1), and a plurality of groups of plug-in blocks (6) are integrally formed on the upper surface of the substrate (1).

4. The membrane switch key with a combination of PCB and FPC cable and hard and soft connection according to claim 3, characterized in that: It also comprises a guard plate (3), wherein the four ends of the inner cavity of the guard plate (3) are integrally formed with reinforcement parts (8), and the lower surface of each group of reinforcement parts (8) is provided with a plug hole (9) for plugging the plug block (6).

5. The membrane switch key with a combination of PCB and FPC cable as claimed in claim 4, characterized in that: The upper surface of the panel layer (106) is provided with a pressure-sensitive switch (107) and a plurality of groups of display elements (108), and the plurality of groups of display elements (108) are arranged at equal intervals.

6. The membrane switch key with a combination of PCB and FPC cable and hard and soft connection according to claim 5, characterized in that: A switch button (4) is arranged on the upper surface of the guard plate (3), and the switch button (4) is arranged directly above the pressure-sensitive switch (107). A plurality of groups of transparent portions (5) are arranged on the upper surface of the guard plate (3), and the plurality of groups of transparent portions (5) are respectively matched with the plurality of groups of display elements (108).

7. The membrane switch key with a combination of PCB and FPC cable and hard and soft connection according to claim 6, characterized in that: A primer (2) is bonded to the lower surface of the substrate (1), a release paper is bonded to the lower surface of the primer (2), and a through hole for a lead wire (111) to pass through is provided on the lower surface of the primer (2).

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