Recorders – Performance of multiple functions of steam and gas engines – Pressure responsive element
Patent
1991-06-17
1993-05-18
Fuller, Benjamin R.
Recorders
Performance of multiple functions of steam and gas engines
Pressure responsive element
346140R, 310317, 101 9314, B41J 2045
Patent
active
052124975
ABSTRACT:
A multi-orifice ink jet print head array (32) includes multiple drive circuits that drive respective PZTs (16) to cause ink drops to be ejected from respective orifices (28). Each drive circuit includes a voltage divider (36) having a resistor R.sub.S. The ink drop ejection velocity is controlled by selecting an appropriate value of R.sub.S for each voltage divider, thereby compensating for imperfections in manufacturing of the print head array. The value of a particular R.sub.S is selected by temporarily connecting the corresponding voltage divider (36A), in which the value of R.sub.S is R.sub.I, to assessment circuit (56). The assessment circuit includes a potentiometer (66) with resistance value R.sub.POT. Ink drops are ejected at a rapid periodic rate as a camera (102) records the position of the ink drops with respect to a graticule (94) at the time a strobe (100) flashes. The value of R.sub.POT is adjusted until the ink drops are on the graticule as viewed on a monitor (108), at which time R.sub.POT =R.sub.T. R.sub.S is then laser trimmed by an amount R.sub.T, so that R.sub.S =R.sub.F, where R.sub.F =R.sub.I +R.sub.T.
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Goetz Howard V.
Stanley Douglas M.
Bobb Alrick
Fuller Benjamin R.
Preiss Richard B.
Tektronix Inc.
Winkelman John D.
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