Long range selective RFID using laser photodetection wakeup
First Claim
1. A data transfer system comprising:
- a) a radio frequency identification (RFID) reader disposed in a hand held device 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 tag decodes a signal modulating the light beam from the laser wherein only one or more first types of predetermined modulated signals will cause the RFID tag to transmit,wherein one or more second types of modulated signals will cause the RFID tag to switch to an operating mode wherein the RFID tag will operate irrespective of the state of the first photosensitive device.
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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.
41 Citations
15 Claims
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1. A data transfer system comprising:
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a) a radio frequency identification (RFID) reader disposed in a hand held device 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 tag decodes a signal modulating the light beam from the laser wherein only one or more first types of predetermined modulated signals will cause the RFID tag to transmit, wherein one or more second types of modulated signals will cause the RFID tag to switch to an operating mode wherein the RFID tag will operate irrespective of the state of the first photosensitive device. - View Dependent Claims (2)
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3. 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 the laser beam striking the first photosensitive device, wherein the RFID tag decodes a signal modulating the beam of the laser wherein only one or more first types of predetermined modulated signals will cause the RFID tag to transmit, wherein one or more second types of modulated signals will cause the RFID tag to switch to an operating mode wherein the RFID tag will operate irrespective of the state of the first photosensitive device.
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4. A data transfer system comprising:
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a) a radio frequency identification (RFID) reader disposed in a hand held device 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 tag includes a second photosensitive device coupled to the electronic circuit wherein the RFID tag will operate irrespective of the state of the first photosensitive device when light is striking the second photosensitive device, e) wherein in one mode of operation of the RFID tag light is prevented from reaching the second photosensitive device and in another mode of operation of the RFID tag light is allowed to reach the second photosensitive device, wherein a removable light blocking shield is across a transparent window which allows light to pass to the second photosensitive device when the light blocking shield is not present.
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5. 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 the laser beam striking the first photosensitive device, wherein the RFID tag includes a second photosensitive device coupled to the electronic circuit wherein the RFID tag will operate if no light is striking the first photosensitive device when light is striking the second photosensitive device, wherein in one mode of operation of the RFID tag light is prevented from reaching the second photosensitive device and in another mode of operation of the RFID tag light is allowed to reach the second photosensitive device, wherein a removable light blocking shield across a transparent window is removed to allow light to pass to the second photosensitive device.
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6. 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 RFID reader; 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; d) wherein the RFID tag includes a second photosensitive device coupled to the electronic circuit wherein the RFID tag will operate irrespective of the state of the first photosensitive device when light is striking the second photosensitive device; and
,e) wherein the first photosensitive device is not sensitive to ambient lighting and the second photosensitive device is sensitive to ambient lighting. - View Dependent Claims (7, 8, 9, 10, 11)
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12. 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 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; characterized by; wherein the RFID tag includes a second photosensitive device coupled to the electronic circuit wherein the RFID tag will operate if no light is striking the first photosensitive device when light is striking the second photosensitive device, wherein the first photosensitive device is not sensitive to ambient lighting and the second photosensitive device is sensitive to ambient lighting. - View Dependent Claims (13, 14, 15)
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Specification