Patent ID: 6871940

Claim:
A liquid jet recording head for ejecting a recording liquid from orifices toward a receiving medium so as to accomplish a recording by applying droplets of the recording liquid to the receiving medium, said recording liquid formed by dispersing fine particles in a liquid, said liquid jet recording head comprising: a plurality of heating elements; a heating element plate having electrodes for supplying electric current to said heating elements; and a cover plate, molded by resin material, forming a liquid reservoir storing said recording liquid and a plurality of passageways connected to said liquid chamber, one end of each of said passageways being connected to said liquid reservoir and an opposite end of each of said passageways servicing as an outlet port, wherein said heating element plate and said cover plate are stacked so that each of said heating elements faces a respective one of said passageways, and wherein; said outlet port is formed in said cover plate, and is a tip of said passageways or formed at said opposite end of each of said passageways; an opening of said outlet port has a diameter equal to or less than 25 μm; and said resin material has hardness of Rockwell M 65 to M 120 .