Patent ID: 6273539
Filing Date: 2001-08-14
Classification: B41J

Abstract:
An apparatus for ejecting an ink to print images or characters on a recording medium, comprising:a plate member in which an ink channel is formed;an ink supplying source for supplying the ink to the ink channel;a plurality of ink chambers formed in the plate member and each communicating with the ink channel to allow the ink to be moved from the ink channel into the plurality of ink chambers;a plurality of piezoelectric elements allocated independently each of the plurality of the ink chambers, respectively, to change the volume of each of the plurality of ink chambers;a plurality of ink ejecting holes formed in the plate member and communicating with the plurality of ink chambers, respectively, to eject the ink from the plurality of ink chambers;a selection device for selecting more than one of the plurality of ink chambers that actually ejects the ink;a first control device for reducing a volume of each of the selected ink chambers to actually eject the ink from the selected ink chambers; anda second control device for expanding a volume of each of non-selected ink chambers to absorb a pressure wave which is caused by a change of the volume of each of the selected ink chambers,wherein the first control device includes a first driving voltage supplying device for supplying a first driving voltage to the piezoelectric element corresponding to each of the selected ink chambers to deflect the piezoelectric element corresponding to each of the selected ink chambers, and the second control device includes a second driving voltage supplying device for supplying a second driving voltage to the piezoelectric element corresponding to each of the non-selected ink chambers to deflect the piezoelectric element corresponding to each of the non-selected ink chambers.