Fluorescent ink detector
First Claim
Patent Images
1. A fluorescent indicium printing device for printing and detecting a black fluorescent indicium comprising:
- a print head configured to print the black fluorescent indicium using a black fluorescent ink, the ink including at least one black pigment and at least one fluorescent taggant;
a first ink sensor located downstream from the print head for detecting the at least one fluorescent taggant in the printed black fluorescent indicium including;
a first radiant energy source configured to radiate at a first excitation wavelength suitable for exciting the black fluorescent indicium; and
a photodetector having a bandpass filter, wherein the photodetector is adapted to detect luminescent energy at a first excited luminescent wavelength from the black fluorescent indicium printed by the print head,a second ink sensor located downstream from the print head including an infrared detector for detecting the at least one black pigment in the black fluorescent indicium; and
a controller for determining if the indicium comprises a particular black fluorescent ink based upon output of the first ink sensor and the second ink sensor.
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Abstract
A printer luminescent ink sensor for a printing device including a radiant energy source; and a photodetector located downstream from a print head of the printing device. The photodetector is adapted to detect luminescent energy from an indicium printed by the print head, upon exposure to radiant energy from the radiant energy source, substantially immediately after the indicium is printed.
30 Citations
14 Claims
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1. A fluorescent indicium printing device for printing and detecting a black fluorescent indicium comprising:
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a print head configured to print the black fluorescent indicium using a black fluorescent ink, the ink including at least one black pigment and at least one fluorescent taggant; a first ink sensor located downstream from the print head for detecting the at least one fluorescent taggant in the printed black fluorescent indicium including; a first radiant energy source configured to radiate at a first excitation wavelength suitable for exciting the black fluorescent indicium; and a photodetector having a bandpass filter, wherein the photodetector is adapted to detect luminescent energy at a first excited luminescent wavelength from the black fluorescent indicium printed by the print head, a second ink sensor located downstream from the print head including an infrared detector for detecting the at least one black pigment in the black fluorescent indicium; and a controller for determining if the indicium comprises a particular black fluorescent ink based upon output of the first ink sensor and the second ink sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification