Wireless transmitter-receiver information device
First Claim
1. A battery-less informative device comprising,a panel for providing a display of information and responsive to electrical inputs to update said display,an antenna to receive low frequency electromagnetic waves from a control system for controlling the display of information on said panel,a first power generating circuit coupled to said antenna and energizable by said received low frequency electromagnetic waves to provide power to operate the informative device,a circuit communicatively coupled to said antenna that decodes the information from said received low frequency electromagnetic wave to provide said electrical inputs to said panel, anda transmitter coupled to said circuit that is energizable by said received low frequency electromagnetic waves to transmit a short burst of microwaves modulated with a feedback signal to the control system;
- anda second power generating circuit coupled to said transmitter that generates power directly to said transmitter, wherein said first power generating circuit provides the dc power input to said second power generating circuit, the second power generating circuit does not provide power to the information device,wherein the informative device operates solely from energy derived from the received low frequency electromagnetic waves.
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Accused Products
Abstract
The disclosure is of an indoor transceiver system in which first electromagnetic waves at 20 KHz are transmitted from a single loop primary coil in or adjacent a room to a plurality of data storage devices in the same room and having respective multi-turn secondary coils coupled by an induction coupling to such primary coil to receive such waves which provide both operating power and signals for such devices. Each device is responsive to a signal transmitted thereto by such first waves to transmit information from such device via second electromagnetic waves at 900 MHz. Each device has a panel providing a non-volatile display of information which represents the price of goods proximate the device, and which price is updated from time to time by signals transmitted to the device by such first waves.
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Citations
9 Claims
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1. A battery-less informative device comprising,
a panel for providing a display of information and responsive to electrical inputs to update said display, an antenna to receive low frequency electromagnetic waves from a control system for controlling the display of information on said panel, a first power generating circuit coupled to said antenna and energizable by said received low frequency electromagnetic waves to provide power to operate the informative device, a circuit communicatively coupled to said antenna that decodes the information from said received low frequency electromagnetic wave to provide said electrical inputs to said panel, and a transmitter coupled to said circuit that is energizable by said received low frequency electromagnetic waves to transmit a short burst of microwaves modulated with a feedback signal to the control system; - and
a second power generating circuit coupled to said transmitter that generates power directly to said transmitter, wherein said first power generating circuit provides the dc power input to said second power generating circuit, the second power generating circuit does not provide power to the information device, wherein the informative device operates solely from energy derived from the received low frequency electromagnetic waves. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification