Incremental printing of symbolic information – Ink jet – Controller
Patent
1997-06-30
2000-03-14
Barlow, John
Incremental printing of symbolic information
Ink jet
Controller
B41J 29393
Patent
active
060362987
ABSTRACT:
A monochromatic optical sensing system is provided for determining the color and location of ink droplets printed by printheads in a printzone of an inkjet printing mechanism. Printhead carriage and media advance encoders provide input signals that are used in conjunction with signals received from a monochromatic optical sensor that the carriage scans across the printzone to determine droplet location. The monochromatic sensor measures the difference in spectral reflectance between the bare media and the ink droplets when illuminated by a pulsing, blue light emitting diode (LED) of the sensor at a peak wavelength of 430-470 nanometers, to determine the ink color or hue. An inkjet printing mechanism having such a monochromatic optical sensing system is also provided, along with a method of monitoring the color and location of ink droplets deposited on media by the printing mechanism.
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Barlow John
Hewlett--Packard Company
Martin Flory L.
Stewart Jr. Charles W.
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