Patent ID: 6568791
Filing Date: 2003-05-27
Classification: B41J

Abstract:
An ink jet recording head comprising a discharge port plate having a plurality of discharge ports formed therein for discharging recording liquid, a liquid chamber for retaining the recording liquid, a plurality of discharge energy generating elements for discharging the recording liquid, a substrate having one surface on which said plurality of discharge energy generating elements are disposed, and a plurality of liquid flow paths extending in one direction for communicating said liquid chamber with said discharge ports, said liquid flow paths including said discharge energy generating elements therein and having a rectangular sectional configuration,wherein each of said discharge ports is circular in sectional shape at an end portion thereof on the recording liquid discharge side and the sectional area of the discharge port end portion connected with said liquid flow path is larger than that of the discharge port on said recording liquid discharge side, and each of said discharge ports having a sectional shape that is rectangular in one portion and that tapers in such manner as to change the sectional shape thereof from quadrilateral to circular at said recording liquid discharge side.