| 摘要 |
<p>Large print heads with many thousands of nozzles may have current consumption in excess of 20 Amperes. This would cause significant problems if standard interconnection techniques were used. The present invention effects very high current delivery to print heads by utilizing the entire long edges of the print head as power terminals. The V?+ and V-¿ connections are fabricated as 200 νm wide strips of 1 νm aluminum along the edges of the chip which are perpendicular to the print direction. Lines of aluminum extend from the V+ connection until the row of nozzles closest to the V- connection. These lines pass between every second nozzle, and are as wide as the device layout and process technology will allow. Lines of aluminum extend from the V- connection until the row of nozzles closest to the V+ connection. These lines are interdigitated with the V+ lines. This power supply configuration allows tens of Amperes to be supplied to print heads with very low electrical resistance and without significant temperature rise in the on-chip connections. Also, electromigration is sufficiently low that it is not a significant factor in device reliability.</p> |
