Method for printing visible characters with narrow band fluorescent inks
Abstract
Abstract INFORMATION, SUCH AS TYPEWRITTEN SYMBOLS, IS MADE BOTH IN VISIBLY READABLE FORM AND IN A CODE IN WHICH ONE OR MORE NARROW-BAND FLUORESCENT MATERIALS ARE PRESENT IN INKS FOR PARTICULAR SYMBOLS, THE PRESENCE OR ABSENCE OF THE COMPONENTS BEING DETECTABLE BY ULTRAVIOLET ILLUMINATION AND DETECTION OF THE PARTICULAR FLUORESCENT RADIATION PRODUCED. PAPER OR OTHER SUBSTRATE IS COATED WITH A MATERIAL WHICH IS CAPABLE OF REACTING WITH COLOR FORMING COMPONENTS IN THE INKS TO FORM VISIBLE COLOR IMAGES. THE INK IS TRANSPARENT SO THAT ULTRAVIOLET LIGHT WHICH IS USED FOR THE DETERMINATION OF THE CODE CAN PASS INTO IT WITHOUT BEING ABSORBED OR ATTENUATED BY COLORED PIGMENTS. THE VISUAL COMPONENT FOR OPTICAL READING FORMS A BOUNDARY UNDER THE FLUORESCENT INK NEXT TO THE PAPER AND CAN BE OBSERVED THROUGH THE TRANSPARENT INK. ALL OF THE ADVANTAGES OF SENSITIVE RESPONSE TO ULTRAVIOLET LIGHT FOR CODE READING AND THE CAPABILITY OF VISUAL READING ARE RETAINED WITHOUT OFFSETTING DISADVANTAGES.
Inventors
- 👤 John L Rothery
Bibliographic Details
Claims Analysis
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