Device forming a pressure sensor, method for producing such a sensor and application in the production of a touch screen
First Claim
1. A pressure sensor device comprising:
- a substrate comprising an electrical insulation material, said substrate further comprising a first reservoir, a second reservoir in communication with the first reservoir and of which two internal walls are each equipped with an electrode;
a flexible membrane comprising an electrical insulation material, said flexible membrane comprising a protuberance and secured to the substrate so as to enable movement of the protuberance between a position in which it is at a distance from a liquid filling the first reservoir and at least one second position in which it exerts a pressure on the liquid, thus discharging it at least partially from the first reservoir toward the second reservoir with mechanical contact with the two electrodes, said mechanical contact of the liquid with the two electrodes establishing a resistance or capacitance between the two electrodes.
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Accused Products
Abstract
A device forming a pressure sensor is provided. The device includes: a substrate made of electrical insulation material including a first reservoir, a second reservoir in communication with the first reservoir and of which two internal walls are each equipped with an electrode, and a flexible membrane made of an electrical insulation material, including a protuberance and secured to the substrate so as to enable movement of the protuberance between a position in which it is at a distance from a liquid filling the first reservoir and at least one second position in which it exerts a pressure on the liquid, thus discharging it at least partially from the first reservoir toward the second reservoir with mechanical contact with the two electrodes, the mechanical contact of the liquid with the electrodes establishing a resistance or capacitance between the electrodes. Application in the production of a touch screen is also provided.
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Citations
22 Claims
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1. A pressure sensor device comprising:
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a substrate comprising an electrical insulation material, said substrate further comprising a first reservoir, a second reservoir in communication with the first reservoir and of which two internal walls are each equipped with an electrode; a flexible membrane comprising an electrical insulation material, said flexible membrane comprising a protuberance and secured to the substrate so as to enable movement of the protuberance between a position in which it is at a distance from a liquid filling the first reservoir and at least one second position in which it exerts a pressure on the liquid, thus discharging it at least partially from the first reservoir toward the second reservoir with mechanical contact with the two electrodes, said mechanical contact of the liquid with the two electrodes establishing a resistance or capacitance between the two electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for producing a device forming a pressure sensor comprising:
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a) producing a substrate that comprises an electric insulation material, said substrate comprising a first reservoir and a portion of a second reservoir in communication with the first reservoir, b) metallizing a base of the second reservoir to create a first electrode and a portion of an electrical connection line connected to the first electrode, c) producing a flexible membrane comprising an electric insulation material, said flexible membrane comprising a protuberance, d) metallizing a face of the membrane or a layer comprising an electric insulation material secured to the membrane on a side of the protuberance so as to create a second electrode and a portion of a second electrical connection line connected to the second electrode, e) filling a portion of the first reservoir with a liquid, f) securing the flexible membrane to the substrate so as to have the protuberance opposite the first reservoir and enable movement thereof between a position in which it is at a distance from the liquid and at least one second position in which it exerts a pressure on the liquid, thus discharging it at least partially from the first reservoir toward the second reservoir defined by the two electrodes, with mechanical contact with them, said mechanical contact of the liquid with the two electrodes establishing a variation in resistance or capacitance between the two electrodes. - View Dependent Claims (19, 20, 21, 22)
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Specification