Electrically conductive composition
AssigneeDavid Lussey
InventorDAVID LUSSEY
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Abstract
A pressure sensitive electrically conductive composition comprises a contained quantity of magnetite particles, wherein the quantity of magnetite particles includes a distribution of particle sizes between sub-micron and tens of microns, and wherein the magnetite particles have a plurality of planar faces, adjacent planar faces connected at a vertex, the particles each having a plurality of vertices wherein the magnetite particles are irregular in shape and have a low aspect ratio.
Claims25
A pressure sensitive electrically conductive composition comprising a contained quantity of first electrically conductive particles, which first electrically conductive particles are magnetite particles, wherein the quantity of magnetite particles includes a distribution of particle sizes between sub-micron and tens of microns, and wherein the magnetite particles have a plurality of planar faces, adjacent planar faces connected at a vertex, the particles each having a plurality of vertices wherein the magnetite particles are irregular in shape and have a low aspect ratio, and wherein the resistance of the electrically conductive composition changes anisotropically immediately around the point of exertion of pressure on the composition, the change in resistance being in accordance with the pressure exerted thereon, the resistance reducing with increased applied pressure and increasing with reduced applied pressure, between a quiescent state in the absence of pressure and an electrically conducting state when the composition is subject to an applied pressure.
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A sensor comprising two layers of semi-conductor separated by a layer of pressure sensitive electrically conductive composition comprising a contained quantity of first electrically conductive particles, which first electrically conductive particles are magnetite particles, wherein the quantity of magnetite particles includes a distribution of particle sizes between sub-micron and tens of microns, and wherein the magnetite particles have a plurality of planar faces, adjacent planar faces connected at a vertex, the particles each having a plurality of vertices wherein the magnetite particles are irregular in shape and have a low aspect ratio, and wherein the resistance of the electrically conductive composition changes anisotropically immediately around the point of exertion of pressure on the composition, the change in resistance being in accordance with the pressure exerted thereon, the resistance reducing with increased applied pressure and increasing with reduced applied pressure, between a quiescent state in the absence of pressure and an electrically conducting state when the composition is subject to an applied pressure, each layer of semi-conductor having at least one electrode attached thereto and wherein the at least one electrode of one layer of semi-conductor is arranged orthogonal to the at least one electrodes of the other semi-conducting layer.
A method of manufacturing a pressure sensitive electrically conductive composition comprising a contained quantity of first electrically conductive particles, which first electrically conductive particles are magnetite particles, wherein the quantity of magnetite particles includes a distribution of particle sizes between sub-micron and tens of microns, and wherein the magnetite particles have a plurality of planar faces, adjacent planar faces connected at a vertex, the particles each having a plurality of vertices wherein the magnetite particles are irregular in shape and have a low aspect ratio, and wherein the resistance of the electrically conductive composition changes anisotropically immediately around the point of exertion of pressure on the composition, the change in resistance being in accordance with the pressure exerted thereon, the resistance reducing with increased applied pressure and increasing with reduced applied pressure, between a quiescent state in the absence of pressure and an electrically conducting state when the composition is subject to an applied pressure, further including a binder, the electrically conductive particles contained in the binder, the method comprising the step of:
- providing the electrically conductive particles and the binder;
- and
- mixing the electrically conductive particles with the binder until the mixture thereof is homogeneous.
Dependencies are inferred from the claim text.