Device forming tactile screen of the capacitive type
First Claim
1. Device forming a touch screen of the capacitive type for covering a display screen, comprisinga first group of electrically conducting transparent first electrodes insulated from each other, not exposed to the outside,a second group of electrically conducting transparent second electrodes insulated from each other to form front keys, anda substrate of a transparent dielectric material, said second group of electrodes being separated from the first group of electrodes by said transparent dielectric material, the second electrodes of the second group having substantially the same dimensions as the first electrodes of the first group and being superimposed respectively upon the electrodes of the first group while facing one another so as to form capacitors, each capacitor comprising a first electrode and a second electrode in superimposed relationship thereto, the effective capacity of a respective one of said capacitors varying when a body forming a mass reference frame is applied upon a second electrode of said capacitor, the capacitance of the body being in series with each of said capacitors, andan electronic circuit for detecting a variation in capacitance, said circuit being connected only to said first electrodes and not to said second electrodes to detect a variation in effective capacity of any one of said capacitors.
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Accused Products
Abstract
A device forming a touch screen of the capacitive type intended in particular to cower a visualizing screen of a visualizing display unit such as a cathode ray tube. A group of electrically conducting transparent electrodes are arranged to be insulated from each other, not exposed to the outside and are connected to an electronic circuit for detecting capacitive variation. A second group of electrically conducting transparent electrodes insulated from each other are arranged to form front keys and are separated from the first group by a transparent dielectric material. The electrodes of the second group have substantially the same dimensions as the electrodes of the first group and are superimposed respectively upon the electrodes of the first group while facing one another so as to form pairs of capacitors. The effective capacity of each pair of capacitors varies when a body forming a mass reference frame is applied upon a front key. The electrodes of the second group are connected to the electronic detection circuit only by the electrodes of the first group.
63 Citations
22 Claims
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1. Device forming a touch screen of the capacitive type for covering a display screen, comprising
a first group of electrically conducting transparent first electrodes insulated from each other, not exposed to the outside, a second group of electrically conducting transparent second electrodes insulated from each other to form front keys, and a substrate of a transparent dielectric material, said second group of electrodes being separated from the first group of electrodes by said transparent dielectric material, the second electrodes of the second group having substantially the same dimensions as the first electrodes of the first group and being superimposed respectively upon the electrodes of the first group while facing one another so as to form capacitors, each capacitor comprising a first electrode and a second electrode in superimposed relationship thereto, the effective capacity of a respective one of said capacitors varying when a body forming a mass reference frame is applied upon a second electrode of said capacitor, the capacitance of the body being in series with each of said capacitors, and an electronic circuit for detecting a variation in capacitance, said circuit being connected only to said first electrodes and not to said second electrodes to detect a variation in effective capacity of any one of said capacitors.
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19. Device forming a touch screen of the capacitive type for covering a display screen, comprising
a first group of electrically conducting transparent first electrodes insulated from each other, not exposed to the outside, a second group of electrically conducting transparent second electrodes insulated from each other to form front keys, and a substrate of a transparent dielectric material, said second group of electrodes being separated from the first group of electrodes by said transparent dielectric material, the second electrodes of the second group having substantially the same dimensions as the first electrodes of the first group and being superimposed respectively upon the electrodes of the first group while facing one another so as to form capacitors, each capacitor comprising a first electrode and a second electrode in superimposed relationship thereto, the effective capacity of a respective one of said capacitors varying when a body forming a mass reference frame is applied upon a second electrode of said capacitor, the capacitance of the body being in series with each of said capacitors, and an electronic circuit for detecting a variation in capacitance, said circuit being connected only to said first electrodes and not to said second electrodes to detect a variation in effective capacity of any one of said capacitors, said electronic circuit comprising a plurality of oscillators associated with a respective one of said capacitors, the natural frequency of each oscillator being modified at each modification of effective capacity of the respective capacitor resulting from a position of the body forming a mass reference frame constituted by one finger of an operator.
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20. Device forming a touch screen of the capacitive type for covering a display screen, comprising
a first plate-shaped substrate of a transparent dielectric material, said first substrate having a front face, a first group of electrically conducting transparent first electrodes insulated from each other, not exposed to the outside, the first electrodes of the first group being arranged on said front face of said first plate-shaped substrate, a second plate-shaped substrate of a transparent dielectric material, said second substrate having a front face and a rear face, a second group of electrically conducting transparent electrodes insulated from each other to form front keys and separated from the first group by said second plate-shaped substrate of transparent dielectric material, the second electrodes of the second group being arranged on said front face of said second plate-shaped substrate of transparent dielectric material, said rear face of said second plate-shaped substrate being fastened by sticking onto the front face of said first substrate, the second electrodes of the second group having substantially the same dimensions as the first electrodes of the first group and being superimposed respectively upon the first electrodes of the first group while facing one another so as to form capacitors, each capacitor comprising a first electrode and a second electrode in superimposed relationship thereto, the effective capacity of a respective one of said capacitors varying when a body forming a mass reference frame is applied upon a second electrode of said capacitor, the capacitance of the body being in series with each of said capacitors, and an electronic circuit for detecting a variation in capacitance, said circuit being connected only to said first electrodes and not to said second electrodes to detect a variation in effective capacity of any one of said capacitors.
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21. Device forming a touch screen of the capacitive type for covering a display screen, comprising
a first substrate of a transparent dielectric element, said first substrate having a front face and an opposed rear face, a first group of electrically conducting transparent first electrodes insulated from each other, not exposed to the outside, said first group of electrodes being arranged on said front face of said first substrate, a second plate-shaped substrate of a transparent dielectric element, said second substrate having a front face and an opposed rear face, a second group of electrically conducting transparent second electrodes insulated from each other to form front keys, said second group of electrodes being arranged on said front face of said second substrate, said rear face of said second substrate contacting said front face of said first substrate such that said second substrate separates said second group of electrodes from said first group of electrodes, said second electrodes in said second group having substantially the same dimensions as said first electrodes in said first group and being superimposed respectively upon said first electrodes in said first group while facing one another so as to form capacitors, the effective capacity of a respective one of said capacitors varying when a body forming a mass reference frame is applied upon a second electrode of said capacitor, the capacitance of the body being in series with each of said capacitors, and an electronic circuit for detecting a variation in capacitance, said circuit being connected only to said first electrodes and not to said second electrodes to detect a variation in effective capacity of any one of said capacitors, and a layer of indium and tin oxide deposited onto the entire surface of said rear face of said first substrate.
Specification