Patent ID: 6726308
Filing Date: 2004-04-27
Classification: B41J,Y10T

Abstract:
A bubble-jet type ink jet printhead, comprising:a substrate; a plurality of barrier walls arranged parallel to one another on the substrate for dividing a common chamber into a plurality of unit chambers having a predetermined height, each of said plurality of unit chambers are ink flow areas; a bubble generating device provided for each unit chamber, said bubble generating device comprising two unit heaters spaced apart by a predetermined distance on the substrate; electrical leads supplying simultaneous power to both of said pair of said unit heaters causing both of said unit heaters to simultaneously heat up and form a respective pair of bubbles above corresponding ones of said pair of heaters to eject liquid ink; and a nozzle plate, attached to a top side of each of said plurality of barrier walls, said nozzle plate being perforated by a plurality of nozzle holes, each nozzle hole having a diameter less than said predetermined distance between said two heater units, an entire portion of each nozzle hole being disposed entirely in between said two unit heaters of a corresponding bubble generating device, ink being supplied from both sides of each unit chamber.