Patent ID: 6412926
Filing Date: 2002-07-02
Classification: B41J

Abstract:
An ink-jet recording head comprising a pressure generating chamber to be filled with ink, pressure generating means for generating a pressure in said pressure generating chamber, an ink supply chamber for supplying the ink to said pressure generating chamber, an ink supply passage for establishing communication between said ink supply chamber and said pressure generating chamber, and a nozzle in communication with said pressure generating chamber, said pressure generating means causing a pressure change to take place in said air pressure generating chamber so as to discharge an ink droplet from said nozzle;wherein the configurations of said nozzle, said ink supply passage, and said pressure generating chamber are set so that a total sum mT of inertance and a total sum rT of acoustic resistance (the values at a temperature of general 20Â° C.) of said nozzle, said ink supply passage, and said pressure generating chamber in an ink-filled state satisfy expressions (1) and (2), respectively: 0T<1.9Ã—108[kg/m4]â€ƒâ€ƒ(1) 4.0Ã—1012T<11.0Ã—1012[Ns/m5]â€ƒâ€ƒ(2)