Radio frequency (RF) security element, coil and capacitor for an RF-security element and method for production thereof
AssigneeCheckpoint Systems International GmbH
InventorRainer Nolte
Life of this patent
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Abstract
An RF security element has a capacitor (8) and a spiral-wound coil (4) with at least two windings (6), in which the coil has at least one winding of straight wire (12) and at least one winding of undulated wire (14). The coil is produced by alternately winding at least one turn of straight wire (12) and at least one turn of undulated wire (14) onto a winding spindle (22), with the undulated wire being formed by passing a portion of straight wire (12) through at least two mating gears (26). The capacitor (8) is produced by intertwining first and second pieces of wire (16, 18) on the two ends of the coil (4).
Claims20
A coil for an RF security element having a capacitor, the coil comprising a spiral-wound coil (4) having at least two windings (6), wherein the coil comprises at least one winding of straight wire (12) and at least one winding of undulated wire (14).
A method for producing a spiral-wound coil (4) of an RF security element, comprising a step of:
- alternately winding at least one turn of straight wire (12) and at least one turn of undulated wire (14) onto a winding spindle (22).
A method for producing a capacitor (8) of an RF security element having a wire coil (4), the wire coil having a first piece of wire (16) on a first end of the coil and a second piece of wire (18) on a second end of the coil, comprising the following method steps:
- (a) clamping the first piece of wire (16) in a rotary device (38) along which the second piece of wire (18) runs during the winding;
- (b) swiveling the rotary device (38) through an angle of approximately 90°;
- (c) clamping the second piece of wire (18) in the rotary device (38);
- and
- (d) intertwining the first and second pieces of wire (16, 18) by rotating the rotary device (38) about an axis of rotation extending parallel to longitudinal axes of the first and second pieces of wire (16, 18).
Dependencies are inferred from the claim text.