Flexible piezoresistive interfacial shear and normal force sensor and sensor array
First Claim
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1. A force sensor, comprising:
- a polymeric substrate with a thickness comprising a cavity with a tilt plane at an angle to a measured interface;
at least two metal piezoresistors on said tilt plane; and
a contact pad in electrical contact with said metal piezoresistors;
wherein said polymeric substrate and piezoresistors are flexible or deformable, permitting a change in said thickness and in said angle during operation of the force sensor; and
wherein said cavity is pyramid-shaped and is filled with a protective material.
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Abstract
A force sensor includes a polymeric substrate including a cavity with a tilt plane, at least two metal piezoresistors on the tilt plane, and a contact pad connected to the metal piezoresistors. The tilt plane may include a measured interface of from 15° to 75°.
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Citations
26 Claims
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1. A force sensor, comprising:
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a polymeric substrate with a thickness comprising a cavity with a tilt plane at an angle to a measured interface; at least two metal piezoresistors on said tilt plane; and a contact pad in electrical contact with said metal piezoresistors;
wherein said polymeric substrate and piezoresistors are flexible or deformable, permitting a change in said thickness and in said angle during operation of the force sensor; and
wherein said cavity is pyramid-shaped and is filled with a protective material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of making a force sensor, comprising:
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depositing a first layer of metal on a polymeric substrate to form a first set of metal piezoresistors; bonding a contact pad on said first layer of metal, wherein said polymeric substrate comprises a cavity with a tilt plane at an angle to a measured interface, and said first layer of metal is deposited on at least a portion of said tilt plane and said polymeric substrate is flexible or deformable, permitting a change of said angle of said tilt plane during operation of the force sensor; and filling said cavity with a layer of protective material. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification