Method and device for printing information on substrates having security features
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United States of America Patent
Stats
-
Mar 9, 1999
Grant Date -
N/A
app pub date -
Jun 3, 1997
filing date -
Jun 6, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for printing information on a substrate having security features includes the steps of: applying a DC potential difference (DC.sub.TB) between a back electrode and a toner delivery means to create a flow of toner particles from the toner delivery means to the back electrode; interposing a printhead structure, the printhead structure having printing apertures and control electrodes around the printing apertures, between the toner delivery means and the back electrode so as to create a spacing having a width L between the printhead structure and the back electrode and to imagewise control the flow of toner particles; passing the substrate having a thickness T in .mu.m through the spacing; adjusting the spacing between the printhead structure and the back electrode such that the width of the spacing L is greater than or equal to 1.5 T; adjusting the DC potential difference (DC.sub.TB) such that the relationship .vertline.DC.sub.TB .vertline./L, expressed in volts per micrometer (V/.mu.m), is greater than or equal to 1.0; imagewise depositing the toner particles on the substrate through the printing apertures; and fixing the toner particles to the substrate.
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