Patent ID: 6568779
Filing Date: 2003-05-27
Classification: B41J

Abstract:
Method of operating droplet deposition apparatus comprising first and second chambers each supplied with droplet fluid and communicating with a respective nozzle for ejection of droplets therefrom and each having an actuator actuable by electrical signals to vary the volume of that chamber, volume variation sufficient to effect droplet ejection being effected in accordance with droplet ejection input data, said method comprising, in a droplet ejection period, the steps of supplying to said actuator of said first chamber a plurality of first electrical signals to effect ejection from the first chamber of a corresponding number of droplets to form a printed dot of appropriate tone on a surface, and supplying to said actuator of said second chamber a number of second electrical signals that do not effect drop ejection from the second chamber, wherein the change in temperature of the droplet fluid ins aid first chamber caused by the application of said first electrical signals is substantially equal to that in the droplet fluid in said second chamber caused by the application of said second electrical signals.