Integrated circuit transponder with coil antenna in a pneumatic tire for use in tire identification
First Claim
1. A pneumatic tire having an integrated circuit transponder located within the structure of the tire for use in tire identification or data transmission, the tire having two spaced beads respectively including an annular tensile member of wound or cabled steel wire, the tire having a tread, sidewalls, an innerliner and a plurality of plies at least one of which is a continuous ply extending between the annular tensile member, respective ends of the continuous ply being turned axially and radially outwardly about the annular tensile members, the transponder having separate first and second electrodes, the transponder being able to transmit an electrical signal in response to an oscillating electromagnetic field emanating from a source in contact with or spaced from the tire, the pneumatic tire and transponder being characterized by:
- an antenna having first and second leads connected respectively to the first and second electrodes of the transponder, the antenna comprising an electrical coil having a plurality of bunched turns and an area enclosed by such turns, the perimeter of the area being defined by the closed curve formed by the locus of points centered within the bunched turns, the area being circular or oblong with a diameter or maximum dimension across the area, the maximum dimension being greater than or equal to the cross sectional dimension of the bunched turns in the direction perpendicular to the area enclosed by the turns of the coil, the coil being positioned as a secondary winding associated with one of the annular tensile members as a primary winding, the coil being positioned between the inner and outer surfaces of the tire in a location at least partially overlapping the end of the continuous ply turned about the primary winding, the coil area being substantially less than the area enclosed by the primary winding annular tensile member, such coil and member having different axes such that the coil has a varying relationship with respect to points on the sidewalls and tread of the tire, the oscillating electromagnetic field to which the transponder is responsive during interrogation enabling a magnetic field component to pass through the area enclosed by the primary winding annular tensile member causing a magnetic field to encircle the primary winding, a portion of the magnetic field encircling the primary winding passing through the area enclosed by the turns of the coil, thereby, when the magnetic field is sufficiently intense, enabling transmission of the transponder'"'"'s electrical signal via the antenna.
2 Assignments
0 Petitions
Accused Products
Abstract
A pneumatic tire has an integrated circuit transponder which, upon interrogation by an external RF signal, transmits tire identification and/or other data in digitally-coded form. The transponder has a coil antenna of small enclosed area as compared to the area enclosed by an annular tensile member comprising a bead of the tire. The annular tensile member, during transponder interrogation, acts as the primary winding of a transformer. The coil antenna is loosely coupled to the primary winding and is the secondary winding of the transformer. The coil antenna is substantially planar in shape, and, when positioned between the innerliner of the tire and its carcass ply, the transponder may include a pressure sensor responsive to tire inflation pressure.
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Citations
42 Claims
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1. A pneumatic tire having an integrated circuit transponder located within the structure of the tire for use in tire identification or data transmission, the tire having two spaced beads respectively including an annular tensile member of wound or cabled steel wire, the tire having a tread, sidewalls, an innerliner and a plurality of plies at least one of which is a continuous ply extending between the annular tensile member, respective ends of the continuous ply being turned axially and radially outwardly about the annular tensile members, the transponder having separate first and second electrodes, the transponder being able to transmit an electrical signal in response to an oscillating electromagnetic field emanating from a source in contact with or spaced from the tire, the pneumatic tire and transponder being characterized by:
an antenna having first and second leads connected respectively to the first and second electrodes of the transponder, the antenna comprising an electrical coil having a plurality of bunched turns and an area enclosed by such turns, the perimeter of the area being defined by the closed curve formed by the locus of points centered within the bunched turns, the area being circular or oblong with a diameter or maximum dimension across the area, the maximum dimension being greater than or equal to the cross sectional dimension of the bunched turns in the direction perpendicular to the area enclosed by the turns of the coil, the coil being positioned as a secondary winding associated with one of the annular tensile members as a primary winding, the coil being positioned between the inner and outer surfaces of the tire in a location at least partially overlapping the end of the continuous ply turned about the primary winding, the coil area being substantially less than the area enclosed by the primary winding annular tensile member, such coil and member having different axes such that the coil has a varying relationship with respect to points on the sidewalls and tread of the tire, the oscillating electromagnetic field to which the transponder is responsive during interrogation enabling a magnetic field component to pass through the area enclosed by the primary winding annular tensile member causing a magnetic field to encircle the primary winding, a portion of the magnetic field encircling the primary winding passing through the area enclosed by the turns of the coil, thereby, when the magnetic field is sufficiently intense, enabling transmission of the transponder'"'"'s electrical signal via the antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A pneumatic tire having an integrated circuit transponder located within the structure of the tire for use in tire identification or data transmission, the tire having two spaced beads respectively including an annular tensile member of wound or cabled steel wire, the tire having a tread, sidewalls, an innerliner and a plurality of plies at least one of which is a continuous ply extending between the annular tensile members, respective ends of the continuous ply being turned axially and radially outwardly about the annular tensile members, the transponder having separate first and second electrodes, the transponder being able to transmit an electrical signal in response to an oscillating electromagnetic field emanating from a source in contact with or spaced from the tire, the pneumatic tire and transponder being characterized by:
an antenna having first and second leads connected respectively to the first and second electrodes of the transponder, the antenna comprising an electrical coil having a plurality of bunched turns and an area enclosed by such turns, the perimeter of the area being defined by the closed curve formed by the locus of points centered within the bunched turns, the area being circular or oblong with a diameter of maximum dimension across the area, the maximum dimension being greater than or equal to the cross sectional dimension of the bunched turns in the direction perpendicular to the area enclosed by the turns of the coil, the coil being positioned as a secondary winding associated with one of the annular tensile members as a primary winding, the coil being positioned between the inner and outer surfaces of the tire in a location at least partially overlapping the end of the continuous ply turned about the primary winding, the coil area being substantially less than the area enclosed by the primary winding annular tensile member, such coil and member having different axes such that the coil has a varying relationship with respect to points on the sidewalls and tread of the tire, the oscillating electromagnetic field to which the transponder is responsive during interrogation enabling a magnetic field component to pass through the are enclosed by the primary winding annular tensile member causing a magnetic field to encircle the primary winding, a portion of the magnetic field encircling the primary winding passing through the area enclosed by the turns of the coil, thereby, when the magnetic field is sufficiently intense, enabling transmission of the transponder'"'"'s electrical signal via the antenna, the antenna coil being located radially outwardly of the annular tensile member comprising the primary winding, the plane of the antenna coil being substantially parallel to the continuous ply of the tire, and the maximum dimension of the area enclosed by the turns of the coil being substantially parallel to the steel wire comprising the primary winding annular tensile member. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
Specification