Novel circuit structure of membrane keyboard

Abstract

A novel circuit structure of a membrane keyboard is characterized by comprising an upper-layer membrane, a lower-layer membrane, an upper-layer conductive silver layer and a lower-layer conductive silver layer, the upper conductive silver layer is arranged at the bottom of the upper film, and the lower conductive silver layer is arranged at the top of the lower film; an upper-layer protective film is arranged at the bottom of the upper-layer conductive silver layer, a lower-layer protective film is arranged at the top of the lower-layer conductive silver layer, and a waterproof adhesive layer is arranged between the upper-layer protective film and the lower-layer protective film; key point areas are formed in the middles of the upper-layer protective film, the waterproof glue layer and the lower-layer protective film, an upper-layer conductive carbon layer is arranged at the top of each key point area, and a lower-layer conductive carbon layer is arranged at the bottom of each key point area; the upper conductive carbon layer is arranged at the bottom of the upper conductive silver layer; the lower conductive carbon layer is arranged at the top of the lower conductive silver layer; the waterproof glue layer is provided with ventilation channels which are through up and down.

Description

Technical Field

[0001] The utility model relates to the field of notebook computer structures, in particular to a novel circuit structure of a membrane keyboard. Background Art

[0002] The current market has increasingly stringent requirements for notebook computers (hereinafter referred to as laptops) and their components. The membrane switch in the keyboard is a laptop accessory that has very high electrical performance requirements. A humid environment can cause internal circuit abnormalities, especially for some industrial keyboards, where there are also some corrosive elements. For example, sulfur can corrode the silver circuit on the membrane switch. However, most current membrane switches do not effectively prevent sulfur from corroding the silver circuit. Utility Model Content

[0003] A novel circuit structure of a membrane keyboard comprises an upper membrane, a lower membrane, an upper conductive silver layer and a lower conductive silver layer; the upper conductive silver layer is arranged at the bottom of the upper membrane, and the lower conductive silver layer is arranged at the top of the lower membrane; an upper protective film is arranged at the bottom of the upper conductive silver layer, a lower protective film is arranged at the top of the lower conductive silver layer, and a bonding waterproof adhesive layer is arranged between the upper protective film and the lower protective film; a key point area is opened in the middle of the upper protective film, the waterproof adhesive layer and the lower protective film, an upper conductive carbon layer is arranged on the top of the key point area, and a lower conductive carbon layer is arranged at the bottom of the key point area; the upper conductive carbon layer is arranged at the bottom of the upper conductive silver layer, and the lower conductive carbon layer is arranged on the top of the lower conductive silver layer; the waterproof adhesive layer is arranged with an air duct that is transparent from top to bottom.

[0004] Furthermore, the upper film, upper conductive silver layer, upper protective film, upper conductive carbon layer, waterproof adhesive layer, lower film, lower conductive silver layer, lower protective film and lower conductive carbon layer are bonded to each other or connected by printing.

[0005] The beneficial effects of the utility model are:

[0006] 1. Compared with the traditional structure, the biggest difference is that the conductive carbon layer and the protective film are added to cover the conductive silver layer that is easily scratched and corroded, blocking the contact between the conductive silver layer and the external air, thereby effectively protecting the circuit from corrosion and scratches, especially preventing corrosive elements (such as sulfur, etc.) from corroding the conductive silver layer, ensuring normal function.

[0007] 2. The waterproof rubber layer has an air duct to keep air inlet and outlet unobstructed with the outside world. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a cross-sectional schematic diagram of the utility model;

[0009] Figure 2 This is a plan view of the utility model.

[0010] In the figure, 1. upper film; 2. upper conductive silver layer; 3. upper conductive carbon layer; 4. upper protective film; 5. waterproof adhesive layer; 6. lower protective film; 7. lower conductive silver layer; 8. lower film; 9. lower conductive carbon layer; 10. ventilation channel; 11 key point area. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical scheme and advantages of the present application clearer, the present invention is further described in detail below in conjunction with the embodiments. In order to thoroughly understand the present invention, some specific details will be involved in the following description. In the absence of these specific details, the invention of the present invention can still be realized, that is, the description and statement herein can more effectively introduce the nature of their work to other technicians in the field. In addition, it should be noted that it should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the actual protection scope. All raw materials used in the following examples are commercially available products.

[0012] Embodiment 1, as Figure 1-Figure 2 As shown, a novel circuit structure of a membrane keyboard comprises an upper membrane 1, a lower membrane 8, an upper conductive silver layer 2 and a lower conductive silver layer 7; the upper conductive silver layer 2 is arranged at the bottom of the upper membrane 1, and the lower conductive silver layer 7 is arranged at the top of the lower membrane 8; an upper protective film 4 is arranged at the bottom of the upper conductive silver layer 2, a lower protective film 6 is arranged at the top of the lower conductive silver layer 7, and a bonding waterproof adhesive layer 5 is arranged between the upper protective film 4 and the lower protective film 6; a key point area 11 is opened in the middle of the upper protective film 4, the waterproof adhesive layer 5 and the lower protective film 6, an upper conductive carbon layer 3 is arranged on the top of the key point area 11, and a lower conductive carbon layer 9 is arranged at the bottom of the key point area 11; the upper conductive carbon layer 3 is arranged at the bottom of the upper conductive silver layer 2, and the lower conductive carbon layer 97 is arranged on the top of the lower conductive silver layer; the waterproof adhesive layer 5 is arranged with an air duct 10 which is transparent from top to bottom.

[0013] The upper film 1, the upper conductive silver layer 2, the upper protective film 4, the upper conductive carbon layer 3, the waterproof adhesive layer 5, the lower film 8, the lower conductive silver layer 7, the lower protective film 6 and the lower conductive carbon layer 9 are bonded to each other or connected by printing.

[0014] If the upper protective film 4 is bonded to the upper conductive silver layer 2 and the lower protective film 6 is bonded to the lower conductive silver layer 7 by laminating, the protective film is selected as PET film; if the upper protective film 4 is printed on the upper conductive silver layer 2 and the lower protective film 6 is printed on the lower conductive silver layer 7, the protective film is insulating ink.

[0015] The biggest difference between the utility model and the traditional structure is that the conductive silver layer that is easily scratched and corroded is completely covered by the conductive carbon layer and the protective film, blocking the contact between the conductive silver layer and the external air, thereby effectively protecting the circuit from corrosion and scratching, especially preventing the corrosion of corrosive elements (such as sulfur, etc.) to the conductive silver layer, ensuring normal function. The waterproof adhesive layer 5 has an air duct 10 to keep the air intake and exhaust unobstructed with the outside world.

[0016] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation of the present invention.

Claims

1. A novel circuit structure of a membrane keyboard, characterized in that: It comprises an upper film, a lower film, an upper conductive silver layer and a lower conductive silver layer; the upper conductive silver layer is arranged at the bottom of the upper film, and the lower conductive silver layer is arranged at the top of the lower film; an upper protective film is arranged at the bottom of the upper conductive silver layer, a lower protective film is arranged at the top of the lower conductive silver layer, and a bonding waterproof adhesive layer is arranged between the upper protective film and the lower protective film; a key point area is opened in the middle of the upper protective film, the waterproof adhesive layer and the lower protective film, an upper conductive carbon layer is arranged on the top of the key point area, and a lower conductive carbon layer is arranged at the bottom of the key point area; the upper conductive carbon layer is arranged at the bottom of the upper conductive silver layer, and the lower conductive carbon layer is arranged on the top of the lower conductive silver layer; the waterproof adhesive layer is arranged with an air vent which is transparent from top to bottom.

2. A novel circuit structure of a membrane keyboard as claimed in claim 1, characterized in that: The upper film, the upper conductive silver layer, the upper protective film, the upper conductive carbon layer, the waterproof adhesive layer, the lower film, the lower conductive silver layer, the lower protective film and the lower conductive carbon layer are bonded to each other or connected by printing.

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