Chipless RF tags
First Claim
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1. A method of marking an article to enable its identification, the method comprising:
- applying to the article a plurality of conductive paths, each conductive path being at least partially coated with a dye layer comprising at least one compound selected from voltage sensitive fluorescent dye (VSFD) compound, electro luminescent (EL) compound, and organic light emitting diode (OLED) compound, each of the dye layers being excitable to cause fluorescent radiation to be emitted therefrom, thereby producing a plurality of signals indicative of said fluorescent radiation, said signals serve to identify the article.
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Abstract
A method of marking an article to enable its identification, by applying to the article a conductive path, which is at least partially coated with a dye layer of at least one compound selected from voltage sensitive fluorescent dye (VSFD), mixture of such dyes, electro luminescent (EL) compound, OLED compound or mixtures thereof, the dye layer being excitable to emit fluorescent radiation, which serves to identify the article.
63 Citations
27 Claims
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1. A method of marking an article to enable its identification, the method comprising:
applying to the article a plurality of conductive paths, each conductive path being at least partially coated with a dye layer comprising at least one compound selected from voltage sensitive fluorescent dye (VSFD) compound, electro luminescent (EL) compound, and organic light emitting diode (OLED) compound, each of the dye layers being excitable to cause fluorescent radiation to be emitted therefrom, thereby producing a plurality of signals indicative of said fluorescent radiation, said signals serve to identify the article. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A radio frequency (RF) tag comprising a substrate, a conductive path at least partially coated by a dye layer comprising at least one compound selected from a voltage sensitive fluorescent dye (VSFD), electro-luminescent (EL) compound, organic light emitting diode (OLED) compound, a photosensitive device, and a radio frequency antenna, wherein:
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the dye layer is capable of emitting light in response to a voltage signal induced in the conductive path;
the photosensitive device is capable of receiving the emitted light and converting it to an electrical signal that depends on the intensity of the emitted light; and
the RF antenna is electrically connected to the photosensitive device, so as to be responsive to the electrical signal, produced in the photosensitive device in response to the light emitted from the dye layer, to transfer the electrical signal into an RF signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
(i) providing a substrate;
(ii) printing on the substrate at least one conductive path;
(iii) printing at least partially on each of said at least one conductive path a dye layer comprising at least one compound selected from voltage sensitive fluorescent dye (VSFD) compound, electro luminescent (EL) compound, and organic light emitting diode (OLED) compound, thus forming at least one printed conductive path at least partially coated;
(iv) applying to said at least one printed conductive path formed in step (iii) a photosensitive device that is capable of sensing light emitted from a dye layer coating said conductive path; and
(v) printing an antenna electrically connected to the photosensitive device and to one of the conductive paths.
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26. A method according to claim 25, wherein said dye layer comprises a mixture of more than one compound, each being independently selected from voltage sensitive fluorescent dye (VSFD) compound, electro luminescent (EL) compound, and OLED compound.
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27. A method according to claim 13, wherein said dye layer comprises a mixture of more than one compound, each being independently selected from voltage sensitive fluorescent dye (VSFD) compound, electro luminescent (EL) compound, and OLED compound.
Specification