Patent ID: 6499836
Filing Date: 2002-12-31
Classification: B41J,Y10T

Abstract:
An ink jet recording head comprising:an ink passage unit including: a nozzle plate having a plurality of nozzles; an ink passage plate formed of a metal sheet having a first surface and a second surface opposite said first surface, having a plurality of pressure producing chambers comprised of recesses formed by pressing said first surface of said metal sheet, each of said pressure producing chambers communicating with a respective one of said nozzles, having an ink reservoir communicating with said pressure producing chambers through a plurality of ink inlet ports, said ink reservoir being formed of a through hole between said first surface and said second surface of said metal sheet, and having a protuberance-forming recess in said second surface of said metal sheet formed by pressing said sheet such that protrusions are formed surrounding said recesses of said pressure producing chambers when said recesses of said pressure producing chambers are formed; and a cover plate closely joined to said first surface of said ink passage plate, wherein said nozzle plate, said ink passage plate, and said cover plate are superposed to form said ink passage unit; and a pressure generator for applying pressure to ink in said pressure producing chambers.