DUAL HEATERS IN A THERMAL INK JET CHANNEL
Original Publication Date: 1991-Apr-30
Included in the Prior Art Database: 2004-Apr-05
Xerox Disclosure Journal
A tandem dual heater arrangement in thermal ink jet (TIJ) print head channels is disclosed. Conventional TIJ technology utilizes a single heater for bubble generation which gives rise to proper lead drop formation but also creates trailing or satellite droplets. Minimization or elimination of the satellite droplets may be achieved by including a second heater element into the TIJ channel as shown in the sequence of Figures. A first heater element 1 generates a nucleate bubble 3 that begins an ink drop formation and ejection process, Figure 2. A second heater 2 in tandem with the first heater is next activated Figure 3, to generate a second bubble 4 to sever a trailing tail and further accelerate the ink droplet 5, Figure 4. Capillary action of the ink in the channel returns the system to the ready state, Figure 1. Thus, the second heater 2 acts as a knife to trim off satellite drops and reduce front face-6 contamination of the TIJ element.