Patent ID: 6431688
Filing Date: 2002-08-13
Classification: B41J

Abstract:
In a thermal-compression ink jet apparatus, comprising:a nozzle module having an ink chamber for containing ink and a nozzle hole for permitting the ink in the ink chamber to jet therethrough; a driving module having a working fluid chamber in which is located a heater; and a membrane to provide a partition between the ink chamber and the working fluid chamber, the membrane having an ink injecting hole through which ink is fed to the working fluid chamber from an external ink source; the improvement comprising:locating in the membrane an interconnecting hole that interconnects the working fluid chamber and the ink chamber, thereby providing a path via which ink in the working fluid chamber is fed into the ink chamber; and locating within the ink injecting hole, a neck part adapted for narrowing the ink injecting hole to a size smaller than the inner diameter of the working fluid chamber, whereby back flow of ink from the working fluid chamber to the ink injecting passage is prevented.