TRIPLE GUN BUBBLE JET PRINTING
Original Publication Date: 1985-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
In the existing thermal ink jet printers, also referred to as bubble ink jet printers, ink droplets are ejected therefrom on demand by pulse heating small resistors in capillary ink-filled channels. The channels terminate at one end with a nozzle or orifice and the other end connects to an ink supply chamber. Each channel has one individually addressable resistor located near the nozzle. When the resistor is selectively addressed with a current pulse, the ink in contact with the resistor is momentarily vaporized to produce a bubble that causes the ink to bulge from the nozzle. At the start of the bubble collapse, the bulging ink breaks away from the nozzle and is propelled toward a recording medium. This method is quite satisfactory for low density capillary channels, such as 150 per inch, but channel wall thickness necessarily causes a dimensional problem with high densities.
XEROX DISCLOSURE JOURNAL
TRIPLE GUN BUBBLE JET PRINTING Proposed Classification Thomas A. Tellier U.S. C1. 346/140
Int. Cl. Gold 15/16
, I c: 'I I
TRIPLE GUN BUBBLE JET PRINTING (Cont'd)
Referring to the figure, by inserting three heating elements 12a, 12b, 12c of the proper geometry and placement are formed into each channel 14. By controlling the channel length from nozzles 20 to heating element dimension, droplets 18 having three different droplet trajectories could possibly be achieved by the vectoring of forces off the channel walls 16. If two elements in any channel were fired simultaneously, possibly five different trajectories could be achieved, thus, allowing the heating elements 12 to be tripled (450 per inch), or quintupled (750 per inch), while the channel count remains at 150 per inch. If the angle of deflection achieved is sufficient, the channel wall thickness would not change, thus relaxing the fabrication requirements for extremely thin wal I thicknesses for higher densities.
212 XEROX DISCLOSURE JOURNAL
Volurne 10 Number 4 July/August 1985