Apparatus for injecting a recording solution of a print head using phase transformation of thin film shape memory alloy

摘要

In an apparatus for injecting a recording solution of a print head, a buckling force of a thin film shape memory alloy is increased by a pressure lower than an atmospheric pressure when the thin film shape memory alloy is cooled down to be buckled to its initial state. Thus, time taken for refilling a liquid chamber after the recording solution is injected, i.e., an operating frequency, is increased to enhance printing performance. The apparatus includes the thin film shape memory alloys of a shape memory alloy having a phase transformed by a temperature variation, an electric power supply section for inciting the temperature variation of the thin film shape memory alloys, a substrate having space portions in a state of being lower than the atmospheric pressure for forcibly phase-transforming the thin film shape memory alloy when they are coupled thereto, a passage plate which is installed over the thin film shape memory alloys, is formed with liquid chambers for retaining the recording solution and is formed with a feed path in one sides of wall planes surrounding the liquid chambers for introducing the recording solution, and a nozzle plate installed over the passage plate and formed with nozzles having dimensions smaller than those of the liquid chambers of the passage plate for enabling the recording solution to be injected in the form of droplet when the phase of the thin film shape memory alloys is transformed.