Thermal ink jet printer
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United States of America Patent
Stats
-
Dec 25, 1984
Issued Date -
N/A
app pub date -
Sep 7, 1982
filing date -
Aug 14, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A thermal ink jet printer is disclosed in which ink droplets are ejected from an orifice by the explosive formation of a vapor bubble within the ink supply due to the application of a two part electrical pulse to a resistor within the ink supply. The electrical pulse comprises a precurser pulse and a nucleation pulse; the precurser pulse preheats the ink in the vicinity of the resistor to a temperature below the boiling temperature of the ink so as to preheat the ink while avoiding vapor bubble nucleation within the ink supply and the subsequently occuring nucleation pulse very quickly heats the resistor to near the superheat limit of the ink.
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