Incremental printing of symbolic information – Ink jet – Controller
Patent
1997-10-27
2000-08-22
Pendergrass, Joan
Incremental printing of symbolic information
Ink jet
Controller
347100, B41J 217
Patent
active
061060895
ABSTRACT:
An ink jet printing apparatus adapted to producing images using inks having predetermined concentrations of a magnetic label material therein, includes a printhead; an ink delivery system adapted to provide inks to the printhead; and a magnetic sensor associated with the ink delivery system, said sensor being sensitive to the magnetic label material in the ink and adapted to produce a signal which is characteristic of the concentration of the label material in the ink; wherein said magnetic sensor includes a horseshoe permanent magnet having first and second pole faces and a pair of magnetic field sensors located symmetrically between said pole faces having their axes of magnetic field sensitivity aligned perpendicular to the fixed field of said permanent magnet such that no signal is produced from said fixed field.
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Johnson, J.E. and Belmont, J.A., Novel Black Pigment for Ink Jet Ink Applications, Recent Progress in Ink-Jet Technologies, Society for Imaging Science and Technology, pp. 226-229.
Chamberlain, IV Frederick R.
Wen Xin
Eastman Kodak Company
Noval William F.
Pendergrass Joan
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