Membrane switch with normally-closed switch function

Abstract

The invention discloses a membrane switch with a normally-closed switch function. The membrane switch comprises a switch main body. The membrane switch is characterized in that: the switch main body comprises a panel layer, a first adhesive layer, a first circuit layer, a second adhesive layer and a normally-closed working layer which are sequentially arranged from top to bottom, the normally-closed working layer comprises a magnetic layer arranged at the bottom of the second adhesive layer, a magnetically attracted key piece magnetically connected to the bottom of the magnetic layer and a conductive layer located between the magnetic layer and the magnetically attracted key piece, and the magnetically attracted key piece enables the conductive layer and the first circuit layer to be in normally-closed connection under magnetic attraction of the magnetic layer; and the panel layer is provided with a key for pressing and driving the magnetically attracted key piece through an external force to disconnect the normally closed connection between the conductive layer and the first circuit layer. The function of the normally-closed switch is added to the membrane switch, the function userequirements of specific equipment are met, and the membrane switch is further researched and developed on the basis of the function of the normally-closed switch, so that the membrane switch has a double-open function, and the practicability of the membrane switch is enhanced.

Description

technical field [0001] The invention relates to the field of membrane switches, in particular to a membrane switch with a normally closed switch function. Background technique [0002] Membrane switch is an operating system integrating function button function, indicating element and instrument panel. It is widely used in electronic communication, electronic measuring instrument, industrial control, medical work equipment, automobile industry, smart toys, household appliances and other fields. Existing membrane switches are all membrane switches that are in the off state under normal conditions, that is, the existing membrane switches require an external force to press the button to make the circuit in the membrane switch conduct, and generate a control signal when it is disconnected, and press it without external force. When the key is pressed, the circuit of the membrane switch is consistently disconnected. However, in actual use, the functions on some specific devices wi...

AI Technical Summary

Problems solved by technology

However, in actual use, the functions on some specific devices will require the circuit of the membrane switch to be normally closed. However, because the existing membrane switch does not have a normally closed function, it cannot meet the functional requirements of some specific devices. So still need to improve

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