Patent ID: 6380845
Filing Date: 2002-04-30
Classification: G06K

Abstract:
A radio frequency identification device comprising:a housing including a polyester film substrate and encapsulant over the substrate; a battery supported in the housing having first and second terminals of opposite polarity; radio frequency identification circuitry in the housing configured to provide a signal to identify the device in response to an interrogation signal, the radio frequency Identification circuitry being defined by a single integrated circuit including a processor, a backscatter transmitter coupled to the processor and configured to transmit by reflecting or not reflecting a carrier wave from an interrogator, and a receiver coupled to the processor, the radio frequency identification circuitry being active circuitry configured to: be powered by the battery and not by magnetic coupling; and a selectively pressable switch formed in the housing between the substrate and the encapsulant, including a conductor formed of printed thick film, and coupling this circuitry to the battery only while the switch is pressed, wherein the switch includes a first conductor formed of printed thick film and having a first end coupled to the battery and having a second end, a second conductor formed of printed thick film and having a first end coupled to the circuitry and having a second end spaced apart from the second end of the first conductor, an insulating ring having a periphery circumscribing the second end of the first conductor and the second end of the second conductor, and a diaphragm having a periphery corresponding to the periphery of the insulating ring and having a conductive face facing the second end of the first conductor and the second end of the second conductor.