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US 4,518,648 AGranted
Sheet material and production method thereof
AssigneeAlps Electric Co., Ltd.
InventorsHiroyasu Miyata, Kazuhiko Ito
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AssigneeAlps Electric Co., Ltd.
InventorsHiroyasu Miyata, Kazuhiko Ito
Estimating the term…
A sheet material adapted for producing pressure sensitive elements includes an electrically conductive net-shaped member having projecting and recessed portions, and an electrically insulating layer in which the net-shaped member is buried such that only the projecting and recessed portions thereof are exposed out of the insulating layer, planar members are further provided on both sides of the insulating layer, while each of the planar members is provided with a resistance layer deposited on a surface thereof facing the insulating layer, so that when a depressing force is applied across the planar members, the resistance layer deposited thereon is brought into contact with the exposed portions of the net-shaped member. A method for producing the sheet material is also defined within the scope of the invention.
A sheet material comprising a net-shaped member having projecting portions and recessed portions, and an electrically insulating layer in which the net-shaped member is buried such that only the projecting and recessed portions thereof are exposed out of the insulating layer.
A method for producing a sheet material comprising the steps of preparing a paste of a high-molecular substance mixed with microcapsules thermally expansible at a low temperature, forming the paste into an insulating layer, burying a net-shaped member made of an electrically conductive material and having projecting portions and recessed portions into the insulating layer such that the entire meshes of the net-shaped member are filled with the paste, removing excess high molecular weight substance to expose the projecting and recessed portions of the net-shaped member from the surface of the insulating layer, heating the entire combination to a temperature adapted to expand the microcapsules contained in the paste, and hardening the paste for obtaining the ultimate product.
A method for producing a sheet material comprising the steps of:
Dependencies are inferred from the claim text.