Switch normally-closed structure applied to membrane switch

Abstract

The utility model discloses a switch normally-closed structure applied to a membrane switch, and belongs to the technical field of membrane switches. Comprising a shell with a cavity, a circuit assembly arranged in the cavity, a normally-closed assembly connected to the circuit assembly, and an elastic film layer arranged on the circuit assembly and the normally-closed assembly. The normally-closed assembly is provided with a conducting strip, a communicating part of the normally-closed assembly is communicated with a conducting layer and a first circuit layer in an initial state to achieve normally-closed connection to generate a first control signal, an elastic thin film layer is pressed, a connecting piece moves downwards and drives the conducting strip to move downwards, a contact block makes contact with a second circuit layer, and the first circuit layer is located on a disconnection part of the conducting strip. The communication part is communicated with the conductive layer and the second circuit layer to generate a second control signal; the supporting layer and the two thin film layers are arranged, the durability and the anti-fatigue performance of the switch are improved, the downwards-concave arc shape of the upper surface can be attached to fingers for operation, and the comfort of the switch is improved. A contact block and a contact layer are arranged on the conducting strip, so that the stability of signal transmission is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of membrane switches, and in particular relates to a normally closed switch structure applied to a membrane switch. Background Art

[0002] Membrane switch is an operating system that integrates key functions, indicating elements and instrument panels. It has the characteristics of rigorous structure, beautiful appearance, good sealing, moisture resistance and long service life. It is widely used in electronic communications, electronic measuring instruments, industrial control, medical equipment, automotive industry, smart toys and household appliances.

[0003] However, membrane switches usually consist of an elastic film layer and a conductive layer. When the film is pressed, the elastic film layer deforms, allowing the conductive layer to contact the contact electrode, thereby achieving conduction. However, these switches often lack durability. After long-term use, the elastic film layer may fatigue or break, causing the switch to fail. In addition, when the membrane switch is pressed, poor contact at the contact point may cause unstable signal transmission, affecting the normal operation of the device. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a normally closed switch structure applied to a membrane switch.

[0005] The technical solution adopted by the utility model is as follows: a normally closed switch structure applied to a membrane switch, comprising:

[0006] a housing having a chamber;

[0007] A circuit assembly is disposed in the chamber;

[0008] A normally closed component connected to the circuit component; the normally closed component has a conductive sheet, and in an initial state, the conductive sheet is connected to the circuit component to achieve a normally closed connection;

[0009] The elastic film layer is arranged on the circuit component and the normally closed component.

[0010] Preferably, the circuit assembly comprises:

[0011] a conductive layer, disposed at a predetermined position of the chamber;

[0012] A first circuit layer is disposed on the upper side of the conductive layer;

[0013] The second circuit layer is arranged on the lower side of the conductive layer.

[0014] Preferably, the conductive layer has a first through hole, the first circuit layer has a second through hole, and in an initial state, the conductive sheet penetrates and connects the first through hole and the second through hole to achieve a normally closed connection.

[0015] Preferably, the normally closed component further comprises:

[0016] A connecting member, disposed at the upper end of the conductive sheet and connected to the elastic film layer;

[0017] At least one contact block is arranged at the bottom end of the conductive sheet.

[0018] Preferably, the conductive sheet has a connecting portion and a disconnecting portion disposed on an upper side of the connecting portion, wherein a width of the disconnecting portion is smaller than a width of the connecting portion; and contact layers are disposed on both sides of the connecting portion.

[0019] Preferably, the elastic film layer comprises:

[0020] A first film layer is disposed on the upper side of the shell;

[0021] A support layer, disposed on the upper side of the first film layer;

[0022] The second film layer is arranged on the upper side of the supporting layer.

[0023] Preferably, the upper surface of the support layer is in a concave arc shape, and the lower surface is in a convex arc shape, and the lower surface is disposed in contact with the first film layer.

[0024] Beneficial effects of the utility model: Compared with the prior art, the utility model provides a conductive sheet, whose connecting part connects the conductive layer and the first circuit layer in the initial state to achieve a normally closed connection, generates a first control signal, presses the elastic film layer downward to open the switch, and the connector moves downward, driving the conductive sheet to move downward, the contact block contacts the second circuit layer, the first circuit layer is located at the disconnected part of the conductive sheet, and the connecting part connects the conductive layer and the second circuit layer to generate a second control signal, thereby realizing the multi-function of the membrane switch; the support layer and two film layers are provided, which not only improves the durability and fatigue resistance of the membrane switch, but also the concave arc shape of the upper surface of the support layer can fit the finger for operation, conforms to the ergonomic design, and improves the comfort of the membrane switch. The contact block and the contact layer are provided on the conductive sheet to reduce the problem of poor contact and improve the stability and reliability of signal transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the utility model;

[0026] Figure 2 It is an enlarged schematic diagram of point A of the present utility model.

[0027] In the accompanying drawings, the list of components represented by each reference numeral is as follows: shell 1, chamber 2, conductive sheet 3, conductive layer 4, first circuit layer 5, second circuit layer 6, connector 7, contact block 8, connecting part 9, disconnecting part 10, contact layer 11, first film layer 12, supporting layer 13, second film layer 14. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the specification and embodiments, which will enable those skilled in the art to more fully understand the present invention, but will not limit the present invention in any way.

[0029] In order to solve the technical problems existing in the background technology, this embodiment discloses a switch normally closed structure applied to a membrane switch, such as Figure 1 to Figure 2 As shown. It includes: a housing 1 having a chamber 2, a circuit component arranged in the chamber 2, a normally closed component connected to the circuit component, and an elastic film layer arranged on the circuit component and the normally closed component. The normally closed component has a conductive sheet 3. In the initial state, the conductive sheet 3 is connected to the circuit component to achieve a normally closed connection. The elastic film layer is the switch body, which is used to open and close the membrane switch.

[0030] In this embodiment, the circuit assembly includes: a conductive layer 4 disposed at a predetermined position of the chamber 2, a first circuit layer 5 disposed on the upper side of the conductive layer 4, and a second circuit layer 6 disposed on the lower side of the conductive layer 4. The conductive layer 4 is connected to any circuit layer to form a closed loop and generate a control signal. The conductive layer 4 has a first through hole, and the first circuit layer 5 has a second through hole. In the initial state, the conductive sheet 3 penetrates and connects the first through hole and the second through hole to achieve a normally closed connection.

[0031] In a further embodiment, the normally closed component further includes: a connector 7 disposed at the upper end of the conductive sheet 3 and connected to the elastic film layer, and at least one contact block 8 disposed at the bottom end of the conductive sheet 3. In this embodiment, the connector 7 is used to achieve the connection between the elastic film layer and the conductive sheet 3; in order to improve the stability and reliability of signal transmission, two contact blocks 8 are provided.

[0032] In a further embodiment, the conductive sheet 3 has a connecting portion 9 and a disconnecting portion 10 arranged on the upper side of the connecting portion 9, the width of the disconnecting portion 10 is smaller than the width of the connecting portion 9, and the connecting portion 9 and the disconnecting portion 10 are integrally formed; contact layers 11 are arranged on both sides of the connecting portion 9 to reduce the problem of poor contact.

[0033] In a further embodiment, the elastic film layer includes: a first film layer 12 disposed on the upper side of the housing 1, a support layer 13 disposed on the upper side of the first film layer 12, and a second film layer 14 disposed on the upper side of the support layer 13. The upper surface of the support layer 13 is a concave arc shape, and the lower surface is a convex arc shape. The lower surface is arranged in contact with the first film layer 12. The concave arc shape of the upper surface can fit the finger for operation, which conforms to the ergonomic design and improves the comfort of the membrane switch. The two film layers are provided to improve the durability and fatigue resistance of the membrane switch.

[0034] The working principle of the utility model is: the connecting portion 9 of the conductive sheet 3 connects the conductive layer 4 and the first circuit layer 5 in the initial state to realize the normally closed connection and generate a first control signal; the elastic film layer is pressed downward to realize the opening of the switch, the connecting member 7 moves downward and drives the conductive sheet 3 to move downward, the contact block 8 contacts the second circuit layer 6, the first circuit layer 5 is located at the disconnecting portion 10 of the conductive sheet 3, and the connecting portion 9 connects the conductive layer 4 and the second circuit layer 6 to generate a second control signal, thereby realizing the multi-function of the membrane switch.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A normally closed switch structure applied to a membrane switch, characterized in that: include: a housing having a chamber; A circuit assembly is disposed in the chamber; a normally closed component connected to the circuit component; An elastic film layer is disposed on the circuit component and the normally closed component; the elastic film layer comprises: A first film layer is disposed on the upper side of the shell; A support layer, disposed on the upper side of the first film layer; A second film layer is disposed on the upper side of the support layer; The normally closed component has a conductive sheet, which is connected to the circuit component in an initial state to achieve a normally closed connection; a connector is arranged at the upper end of the conductive sheet and connected to the elastic film layer; at least one contact block is arranged at the bottom end of the conductive sheet; the conductive sheet has a connecting portion and a disconnecting portion arranged on the upper side of the connecting portion, and the width of the disconnecting portion is smaller than the width of the connecting portion; contact layers are arranged on both sides of the connecting portion.

2. The normally closed switch structure applied to a membrane switch according to claim 1, characterized in that: The circuit assembly comprises: a conductive layer, disposed at a predetermined position of the chamber; A first circuit layer is disposed on the upper side of the conductive layer; The second circuit layer is arranged on the lower side of the conductive layer.

3. The normally closed switch structure applied to a membrane switch according to claim 2, characterized in that: The conductive layer has a first through hole, the first circuit layer has a second through hole, and in an initial state, the conductive sheet penetrates and connects the first through hole and the second through hole to achieve a normally closed connection.

4. The normally closed switch structure applied to a membrane switch according to claim 1, characterized in that: The upper surface of the support layer is in a concave arc shape, and the lower surface is in a convex arc shape. The lower surface is arranged in contact with the first film layer.

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