公开(公告)号：JPH0280253A

公开(公告)日：1990-03-20

申请号：JP19279689

申请日：1989-07-27

Applicant: IBM

Inventor： AREN SUTEIRINGU KIYANPUBERU ,  JIEROOMU MAIKERU ERUDORITSUJI ,  FURANSHISU SHIII-SHIYUUN RII ,  GURAHAMU ORIIBU

IPC: B41J2/05 ,  B41J2/14

Abstract: PURPOSE: To avoid a damage caused by a cavitation or to largely reduce it by combining a plurality of bubbles generated from a plurality of heating parts at the time of applying an electric signal to grow to a single bubble not annular above an opening, and injecting ink droplets from a nozzle. CONSTITUTION: Bubbles normally generate nuclide of bubbles at both parts of slender part 23 for forming bubbles 26a and both parts of an end 24 for forming bubbles 26b. The bubbles 26b are formed slightly thinner than the bubbles 26a according to a slight difference of a current density. Thus, when the forming time is deviated, they can be combined to one foam. These bubbles 26a and 26b are continuously grown, and combined at the periphery and center for growing the bubbles, that is, combined. Since the bubbles 26a and 26b are grown to a single pillow-shaped bubble 22, it is directed by a moment of the state having sufficient energy toward a nozzle 19 for discharging the ink. At the time of collapsing, the bubble is contracted toward the center of the heating structure (shape) having no resistive material due to the presence of a small slender opening 25.