Patent ID: 7976115
Filing Date: 2011-07-12
Classification: B41J

Abstract:
1. A method of controlling a printer of the type having a printhead with a plurality of nozzles, a heater associated with each nozzle, and where the heater is responsive to a pulse for heating ink and jetting the ink through the nozzle, and a thermal sensor for measuring printhead temperature, comprising: heating the printhead to a predetermined temperature; driving the nozzle heaters during a first interval with pulses having a starting pulse width and a starting frequency; driving the nozzle heaters during subsequent intervals with respective pulses having decremented pulse widths and frequencies having incremented frequencies; processing a temperature change of the printhead during each interval to determine a main fire pulse width that caused a predetermined temperature change; and using the main fire pulse width to drive the nozzle heaters to print characters on a print medium.