Pressure sensing apparatuses and methods
First Claim
Patent Images
1. An apparatus comprising:
- a dielectric structure including a plurality of elastomeric regions separated from one another by space regions and each of the elastomeric regions characterized by common feature dimensions including width and thickness dimensions, each of the elastomeric regions being separated from one another and configured and arranged with such common feature dimensions to respond to pressure applied to the dielectric structure by compressing and thereby exhibit a changed effective dielectric constant of elastomeric material in the elastomeric region, the changed effective dielectric constant corresponding to a state of compression of the elastomeric regions; and
a sense circuit including a plurality of impedance-based sensors, each impedance-based sensor including a portion of the dielectric structure and being configured and arranged to respond to the changed effective dielectric constant by providing an indication of the pressure applied to the dielectric structure adjacent each sensor, the pressure being indicated by a change in impedance,wherein one or more of the elastomeric regions have a cross-sectional width dimension of less than 5 microns, and are configured and arranged with the space regions and the sense circuit to provide respective outputs from each elastomeric region that characterize pressure differences between the elastomeric regions of less than 1 kPa.
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Abstract
Sensors, sensing arrangements and devices, and related methods are provided. In accordance with an example embodiment, an impedance-based sensor includes a flexible dielectric material and generates an output based on pressure applied to the dielectric material and a resulting compression thereof. In certain embodiments, the dielectric material includes a plurality of regions separated by gaps and configured to elastically deform and recover in response to applied pressure.
38 Citations
19 Claims
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1. An apparatus comprising:
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a dielectric structure including a plurality of elastomeric regions separated from one another by space regions and each of the elastomeric regions characterized by common feature dimensions including width and thickness dimensions, each of the elastomeric regions being separated from one another and configured and arranged with such common feature dimensions to respond to pressure applied to the dielectric structure by compressing and thereby exhibit a changed effective dielectric constant of elastomeric material in the elastomeric region, the changed effective dielectric constant corresponding to a state of compression of the elastomeric regions; and a sense circuit including a plurality of impedance-based sensors, each impedance-based sensor including a portion of the dielectric structure and being configured and arranged to respond to the changed effective dielectric constant by providing an indication of the pressure applied to the dielectric structure adjacent each sensor, the pressure being indicated by a change in impedance, wherein one or more of the elastomeric regions have a cross-sectional width dimension of less than 5 microns, and are configured and arranged with the space regions and the sense circuit to provide respective outputs from each elastomeric region that characterize pressure differences between the elastomeric regions of less than 1 kPa. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus comprising:
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a dielectric structure including a plurality of elastomeric regions separated from one another by space regions and each of the elastomeric regions characterized by common feature dimensions including width and thickness dimensions, each of the elastomeric regions being separated from one another and configured and arranged with such common feature dimensions to respond to pressure applied to the dielectric structure-by compressing and thereby exhibit a changed effective dielectric constant of elastomeric material in the elastomeric region, the changed effective dielectric constant corresponding to a state of compression of the elastomeric regions; and a sense circuit including a group of coplanar sensors oriented in different directions and configured to exhibit a common response to a pressure applied in a vertical direction relative to a lateral plane in which the sensors lie, each sensor including a portion of the dielectric structure and being configured and arranged to respond to the changed effective dielectric constant by providing an indication of the pressure applied to the dielectric structure adjacent each sensor, the pressure being indicated by a change in impedance, and each sensor configured and arranged to exhibit different responses, relative to at least one of the other sensors in the group, to stress exerted onto the sensors in said direction.
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12. A pressure sensor comprising:
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a flexible dielectric layer including a plurality of dielectric material regions separated from one another by respectively-situated gap regions, each dielectric material region including elastomeric material in the flexible dielectric layer and the elastomeric material of each dielectric material region being characterized by common feature dimensions including width and thickness dimensions and the elastomeric material of each dielectric material region being separated from one another and configured and arranged with such common feature dimensions to respond to pressure applied to the flexible dielectric layer by compressing and thereby exhibiting dielectric characteristics that vary in response to a pressure applied to the flexible dielectric layer, based on changes in dielectric properties of the elastomeric material, wherein the elastomeric material is configured and arranged with a plurality of elastomeric regions, wherein one or more of the elastomeric regions have a cross-sectional width dimension of less than 5 microns; and first and second electrodes separated by the flexible dielectric layer, the electrodes being configured and arranged to provide an electrical output indicative of the dielectric characteristics of the flexible dielectric layer, therein providing an indication of pressure applied to the flexible dielectric layer.
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13. An apparatus comprising:
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a dielectric structure including a plurality of elastomeric regions separated from one another by space regions and each of the elastomeric regions characterized by common feature dimensions including width and thickness dimensions, each of the elastomeric regions being separated from one another and configured and arranged with such common feature dimensions to respond to pressure applied to the dielectric structure by compressing and thereby exhibiting a changed effective dielectric constant of elastomeric material in the elastomeric region, the changed effective dielectric constant corresponding to a state of compression of the elastomeric regions; and a sense circuit including a plurality of impedance-based sensors, each impedance-based sensor including a portion of the dielectric structure and being configured and arranged to respond to the changed effective dielectric constant by providing an indication of the pressure applied to the dielectric structure adjacent each sensor, the pressure being indicated by a change in impedance; an organic semiconductor substrate configured and arranged to support the dielectric structure and the sense circuit; the plurality of impedance-based sensors at different locations on the substrate, and each sensor further including source and drain electrodes coupled by a channel region that is in the substrate and adjacent a gate dielectric, a gate configured and arranged to apply a bias to the channel region, an elastic dielectric layer between the gate and the channel region, the dielectric layer including a plurality of patterned dielectric regions separated from one another by respective spaces, the dielectric regions being configured and arranged to elastically deform in response to pressure and to exhibit a dielectric characteristic that changes in response to the elastic deformation of the dielectric region; and interconnecting conductors configured and arranged to couple a signal from each of the sensors for detecting an electrical response of the sensors to pressure applied to the dielectric regions. - View Dependent Claims (14, 15, 16, 17)
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18. A device comprising:
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a sensor substrate configured and arranged for insertion into a cavity; a dielectric material on the sensor substrate and having a plurality of dielectric material regions separated from one another by respective spaces and each of the dielectric material regions characterized by common feature dimensions including width and thickness dimensions, the dielectric material being separated from one another and configured and arranged, with the substrate and with such common feature dimensions, to compress and exhibit different dielectric characteristics based upon pressure applied to the dielectric material via a material within the cavity and changes, responsive to the pressure, in a dielectric property of an elastomeric material in the dielectric material regions, the different dielectric characteristics corresponding to a state of compression of the dielectric material regions, wherein the elastomeric material is configured and arranged with a plurality of elastomeric regions, wherein one or more of the elastomeric regions have a cross-sectional width dimension of less than 5 microns; first and second electrodes on the dielectric material and configured and arranged to generate an output based on the dielectric characteristic of the dielectric material; and a circuit connected to the electrodes and configured and arranged to provide an output from the first and second electrodes for access outside of the cavity, while the sensor substrate is inserted within the cavity.
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19. A method of manufacturing a sensor device, the method comprising:
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forming a plurality of sensors, each sensor respectively including an impedance-based sensor having a dielectric material and an electrode, each sensor configured and arranged to generate an output at the electrode based on pressure applied to the dielectric material and changes, responsive to the pressure, in a dielectric property of an elastomeric material in the dielectric material, wherein the elastomeric material is configured and arranged with a plurality of elastomeric regions, wherein one or more of the elastomeric regions have a cross-sectional width dimension of less than 5 microns; and coupling the sensors with interconnecting circuits configured and arranged to provide an output indicative of, for each sensor, both the pressure applied to the dielectric material and a location of the applied pressure.
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Specification