Patent ID: 6527377
Filing Date: 2003-03-04
Classification: B41J

Abstract:
A liquid discharge head comprising:an orifice plate having plural discharge openings for discharging a liquid droplet; and a head main body provided with plural liquid paths for respectively communicating with said plural discharge openings, a liquid chamber for liquid supply to said plural liquid paths, a supply aperture for liquid supply to said liquid chamber, and plural energy generating elements provided corresponding to said plural liquid paths and adapted to generate energy for discharging the liquid droplet, said liquid discharge head being formed by adjoining said orifice plate with an adhesion face of said head main body on which are formed apertures of said liquid paths for communicating with said discharge openings of said orifice plate, wherein said orifice plate comprises a recessed portion and a protruding portion on an adhesion face of said orifice plate, said protruding portion has a shape corresponding to a cross-sectional shape of said liquid path and is provided with one of said discharge openings therein, said protruding portion or a part thereof is made to enter and to fit with one of said liquid paths of said head main body, and said adhesion face of said orifice plate is adjoined with said adhesion face of said head main body, and wherein pitch A of arrangement of said liquid paths, width B of each of said liquid paths, width C of said protruding portion in a direction of the arrangement of said liquid paths, height D of each of said liquid paths, width E of said protruding portion in a direction perpendicular to the direction of the arrangement of said liquid paths, linear expansion coefficient a of said head main body, linear expansion coefficient b of said orifice plate, number n of said liquid paths, and environmental temperature difference At between a temperature before and a temperature after the adjoining of said head main body and said orifice plate satisfy the following two conditions: (Bâˆ’C)/2&gE;|(aâˆ’b)Ã—nÃ—AÃ—&Dgr;t|, and(Dâˆ’E)/2&gE;|(aâˆ’b)Ã—DÃ—&Dgr;t|.