Patent attributes
A drop deposition apparatus for laying down a patterned liquid layer on a receiver substrate, for example, a continuous ink jet printer, is disclosed. The liquid deposition apparatus comprises a drop emitter containing a positively pressurized liquid in flow communication with a linear array of nozzles for emitting a plurality of continuous streams of liquid having nominal stream velocity vj0, wherein the plurality of nozzles have effective nozzle diameters D0 and extend in an array direction with an effective nozzle spacing Ly. Resistive heater apparatus is adapted to transfer thermal energy pulses of period τ0 to the liquid in flow communication with the plurality of nozzles sufficient to cause the break-off of the plurality of continuous streams of liquid into a plurality of streams of drops of predetermined nominal drop volume V0. Relative motion apparatus is adapted to move the drop emitter and receiver substrate relative to each other in a process direction at a process velocity S so that individual drops are addressable to the receiver substrate with a process direction addressability, Ap=τ0S. The effective nozzle spacing is less than 85 microns, the process speed S is at least 1 meter/sec and the addressability, Ap, of individual drops at the receiver substrate in the process direction is less than 6 microns. Drop deposition apparatus is disclosed wherein the predetermined volumes of drops include drops of a unit volume, V0, and drops having volumes that are integer multiples of the unit volume, mV0. Further apparatus is adapted to inductively charge at least one drop and to cause electric field deflection of charged drops.
