Method of making ink jet recording head with tapered orifice

A method for manufacturing an ink jet recording head provided with a plurality of discharge ports for discharging recording liquid, a discharge port plate having said discharge ports therein, a liquid chamber for retaining said recording liquid, a plurality of discharge energy generating elements for discharging said recording liquid, a substrate having said plurality of discharge energy generating elements on one surface thereof, and a plurality of liquid flow paths extended in one direction for communicating said liquid chamber with said discharge ports, said liquid flow paths each having a rectangular cross-section, and said discharge ports being formed by irradiating a laser beam on a member which thereby becomes said discharge port plate through a mask having specific patterns thereon,

• said mask including a transmission section which regulates a shape of said discharge ports, and an attenuation section formed on an outer circumference of said transmission section so that the further the attenuation section is from the transmission, the less the laser beam becomes, and
• forming the discharge ports by irradiating the laser beam through the mask to said member, each said port having a cross-sectional shape which gradually tapers from a rectangular shape at a side of the port connected with said liquid flow path to a circular shape at a recording liquid discharge side of the port.