SHAPED RESISTORS FOR IMPROVED BUBBLE JET PERFORMANCE
Original Publication Date: 1991-Aug-31
Included in the Prior Art Database: 2004-Apr-05
Xerox Disclosure Journal
At present, bubble jet printheads use rectangular shaped resistors. A bubble is formed over the resistor, which drives a drop out the end of a channel placed over the resistor. The drop velocity at the channel exit is about lOm/sec. The bubble has a dimension of about 1 mil (25 pm) over the resistor at full extension. Since the ink is not compressible, one can estimate the time for bubble expansion as channel dimension (25 pm)/drop velocity (107 pdsec) = 2.5 psec. The pulse length applied to the heater is 2-3 psec in length.