| 摘要 |
<p>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 RS. The ink drop ejection velocity is controlled by selecting an appropriate value of RS for each voltage divider, thereby compensating for imperfections in manufacturing of the print head array. The value of a particular RS is selected by temporarily connecting the corresponding voltage divider (36A), in which the value of RS is RI, to assessment circuit (56). The assessment circuit includes a potentiometer (66) with resistance value RPOT. 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 the a strobe (100) flashes. The value of RPOT is adjusted until the ink drops are on the graticule as viewed on a monitor (108), at which time RPOT = RT. RS is then laser trimmed by an amount RT, so that RS = RF, where RF = RI + RT. <IMAGE></p> |
