Pressure sensitive transducer with pressure sensitive layer including semi-conductive particles
AssigneesDenso Corporation, Hokuriku Electric Industry Co., Ltd.
InventorsKatsuhiko Ariga, Masayasu Teraoka, Yoshimitsu Motoki, Ichiro Ishiyama
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Abstract
Pressure sensitive layers are disposed on respective resin films through electrodes to face each other, and include high conductivity flaky carbon particles and low conductivity amorphous-based carbon particles. The two kinds of carbon particles are bound together by a resin-system binder. Accordingly, when a pushing force is applied to the resin films, an average distance between the carbon particles is decreased to cause a tunnel conduction phenomenon, resulting in a decrease in conductive resistance between the electrodes. As a result, a pressure sensing property can be made gentle.
Claims5
A pressure sensitive transducer comprising:
- first and second conductive layers facing each other;
- and
- a pressure sensitive layer provided between the first and second conductive layers, said pressure sensitive layer comprising an insulation material layer and a plurality of semi-conductive particles dispersed in said insulation material layer;
- wherein, when a pushing force is applied to at least one of the first and second conductive layers, a current flows between said first and second conductive layers, said current including a first current produced by said semi-conductive particles directly contacting each other, and a second current produced by a tunnel conduction phenomenon among certain non-contacting ones of the semi-conductive particles separated by a gap equal to or less than a tunnel conduction enabling distance, the second current having a magnitude larger than a magnitude of the first current.
Dependencies are inferred from the claim text.