LONG RANGE SELECTIVE RFID USING LASER PHOTODETECTION WAKEUP
First Claim
1. A data transfer system comprising:
- a) a radio frequency identification (RFID) reader comprising;
i) a radio frequency transmitter and receiver;
ii) a laser in the hand held device; and
b) a RFID tag on a container comprising;
i) a tag antenna coupled to an electronic circuit for receiving radio signals from the radio frequency transmitter and transmitting radio frequency signals to the receiver;
ii) a first photosensitive device coupled to the electronic circuit which is in a first state when light from the laser is not striking the photosensitive device and in a second state when light from the laser is striking the photosensitive device such that the RFID tag transmits a signal only when a light beam from the laser is striking the photosensitive device;
c) wherein the radio frequency transmitter provides power to the RFID tag sufficient to power the electronic circuit and to transmit a signal to the receiver which can be decoded by the RFID reader; and
d) wherein the RFID reader is at least 40 feet away from the RFID tag.
1 Assignment
0 Petitions
Accused Products
Abstract
A data transfer system includes a radio frequency identification (RFID) reader having a radio frequency transmitter and receiver and a laser. The data transfer system also includes a RFID tag on a container which has a first photosensitive device coupled to an electronic circuit in the tag which is in a first state when light from the laser is not striking the photosensitive device and in a second state when light from the laser is striking the photosensitive device such that the RFID tag transmits a signal only when a light beam from the laser is striking the photosensitive device. The tag may be passive, semi-passive (battery assisted passive-BAP), or active. If the tag is BAP then the laser light causes the tag to wake up so that it can respond to the RF signal from a RFID reader. The radio frequency transmitter provides power to the RFID tag sufficient to transmit a signal to the receiver which can be decoded by the RFID reader when the RFID reader is 40 feet or more away from the RFID tag.
32 Citations
25 Claims
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1. A data transfer system comprising:
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a) a radio frequency identification (RFID) reader comprising; i) a radio frequency transmitter and receiver; ii) a laser in the hand held device; and b) a RFID tag on a container comprising; i) a tag antenna coupled to an electronic circuit for receiving radio signals from the radio frequency transmitter and transmitting radio frequency signals to the receiver; ii) a first photosensitive device coupled to the electronic circuit which is in a first state when light from the laser is not striking the photosensitive device and in a second state when light from the laser is striking the photosensitive device such that the RFID tag transmits a signal only when a light beam from the laser is striking the photosensitive device; c) wherein the radio frequency transmitter provides power to the RFID tag sufficient to power the electronic circuit and to transmit a signal to the receiver which can be decoded by the RFID reader; and d) wherein the RFID reader is at least 40 feet away from the RFID tag. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for transmitting radio frequency data from a radio frequency identification (RFID) tag to a RFID reader which is separated from the RFID reader by at least 40 feet comprising the steps of:
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transmitting a radio frequency signal from an antenna in the RFID reader to an antenna in a RFID tag which is coupled to an electronic circuit in the RFID tag, the radio frequency signal being of sufficient power to power the electronic circuit and to transmit a signal to the receiver which can be decoded by the RFID reader; transmitting a laser beam to a first photosensitive device inside the RFID tag which is coupled to an electronic device inside the RFID tag and which, in turn, is coupled to the antenna in the RFID tag; wherein the RFID tag will transmit a signal back to the RFID reader in response to receiving the signal transmitted from the RFID reader antenna and a laser beam striking the first photosensitive device. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A data transfer system comprising:
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a radio frequency identification (RFID) reader comprising; a radio frequency (RF) transmitter and receiver; a laser in the hand held device; and a RFID tag on a container comprising; a tag antenna coupled to an electronic circuit for receiving radio signals from the radio frequency transmitter and transmitting radio frequency signals to the receiver; a first photosensitive device coupled to the electronic circuit which is in a first state when light from the laser is not striking the photosensitive device and in a second state when light from the laser is striking the photosensitive device; and a battery coupled to the electronic circuit and the photosensitive device such that the RFID tag does not respond to signals from the RF transmitter when the photosensitive device is in the first state. - View Dependent Claims (23, 24, 25)
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Specification