Method of driving ink jetting head, and its circuit

Application Number: 00107576
Application Date: 2000.05.18
Publication Number: 1273911
Publication Date: 2000.11.22
Priority Information: 1999/5/18 JP 137894/99
International: B41J2/045
Applicant(s) Name: NEC Corp.
Inventor(s) Name: Iwamura Takukana
Patent Agency Code: 11219
Patent Agent: mu dejun
Abstract A method for driving an ink jet printing head and circuits of the same are provided which are capable of forming fine ink drops in a stable manner and jetting the ink drops from each nozzle with high jetting efficiency and of thereby printing a character or an image with high quality on a printing medium.In the method for driving the ink jet printing head, a waveform of a driving signal is generated by a first voltage changing process in which a voltage is applied to increase a content volume of a pressure generating chamber and by a second voltage changing process in which a voltage is applied to decrease the content volume of the pressure generating chamber and further a time interval between time to start the first voltage changing process and time to start the second voltage changing process is set to a length of time within a range of about three eighths to about three fourths of a natural period of a pressure wave produced in the pressure generating chamber.