Patent ID: 6322202
Filing Date: 2001-11-27
Classification: B41J

Abstract:
A microinjection device for ejecting a fluid, comprising:a substrate;a protective film formed on said substrate;a heater resistor layer formed on said protective film;an adhesion layer formed on said heater resistor layer, said adhesion layer being formed of an electrically conductive material;a first electrode formed as a layer on said adhesion layer;a second electrode formed as a layer on said first electrode, said second electrode being formed as a layer without contacting said adhesion layer;an electrode pad formed on said second electrode for receiving electrical energy for said microinjection device;a heater chamber barrier layer formed on said second electrode, defining a heater chamber with an exposed portion of said heater resistor layer as a floor of said heater chamber;a membrane formed on said heater chamber barrier layer spanning the top of said heater chamber;a fluid chamber barrier layer formed on said membrane, defining a fluid chamber for a fluid; anda nozzle plate formed on said fluid chamber barrier layer, said nozzle plate containing a nozzle providing an opening from said fluid chamber to outside of said microinjection device.