ALIGNMENT OF CHANNEL BEARING CHIP AND HEATER-BEARING CHIP IN A THERMAL INK JET PRINTHEAD
Original Publication Date: 1995-Apr-30
Included in the Prior Art Database: 2004-Apr-07
Xerox Disclosure Journal
A currently viable design for a thermal ink jet printhead comprises a channel chip, defining a set of narrow capillary grooves therein, and a heater chip, which is typically a silicon chip having an array of small resistance heaters formed therein. In constructing the printhead, the two chips are placed together so that each resistance element in the heater chip aligns with one capillary groove in the channel chip. In this way, a set of capillary channels are formed in the space between the chips, with each groove forming one inner surface of each channel, and the surface of the heater chip, having one resistance element defined on the surface thereof, forming the rest of the interior surface of the channel. Each channel temporarily holds liquid ink, and when the resistance element in the particular channel is activated, the liquid ink is rapidly heated within the channel and expelled through a nozzle onto a print sheet.