Abstract

A pressure module (201) comprises a substrate (202), a support structure (203) and a pressing membrane (204). The support structure is connected to the substrate and the pressing membrane to form an accommodating cavity (205) between the substrate and the pressing membrane. An electrode (206) is disposed on a surface of the substrate or the pressing membrane and a variable resistance layer (207) is respectively disposed on the opposite surface of the other of the substrate and the pressing membrane. On application of pressure to the pressing membrane, the pressing membrane is elastically deformed and the variable resistance layer is brought into contact with the electrode to form a contact area and a resistance value between the variable resistance layer and the electrode. The contact area and the elastic deformation is positively correlated.

IPC Classes  ?

• G06F 3/02 - Input arrangements using manually operated switches, e.g. using keyboards or dials
• H01H 1/029 - Composite material comprising conducting material dispersed in an elastic support or binding material
• H03K 17/96 - Touch switches
• H01H 13/79 - Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites characterised by the form of the contacts, e.g. interspersed fingers or helical networks
• H03K 17/965 - Switches controlled by moving an element forming part of the switch