Ink jet head and manufacturing method thereof, and ink jet apparatus with ink jet head

An ink jet head comprising:

• a first base plate provided with energy generating means for generating energy used for discharging ink;
• a second base plate provided with a recessed portion for forming a portion of an ink path;
• and
• a discharge opening member provided with discharge openings communicated with said ink path;
• wherein said ink path is formed by connecting said first base plate and said second base plate so that said energy generating means and said recessed portion are opposed to each other, said discharge openings and said ink path are communicated by integrally forming said discharge opening member with said second base plate, said discharge opening member and said first base plate abut one another, and the discharge openings are formed on the discharge opening member by irradiating a laser beam onto portions of the discharge opening member to be formed into the discharge openings, the laser beam being irradiated from a side where the ink path is formed and in a discharge direction in which ink is discharged such that cross sections of said discharge openings decrease in the discharge direction.

An ink jet apparatus comprising:

• an ink jet head including:
• a first base plate provided with energy generating means for generating energy used for discharging ink,
• a second base plate provided with a recessed portion for forming a portion of an ink path, and
• a discharge opening member provided with discharge openings communicated with said ink path,
• wherein said ink path is formed by connecting said first base plate and said second base plate so that said energy generating means and said recessed portion are opposed to each other, said discharge openings and said ink path are communicated by integrally forming said discharge opening member with said second base plate, said discharge opening member and said first base plate abut one another, and the discharge openings are formed on the discharge opening member by irradiating a laser beam onto portions of the discharge opening member to be formed into the discharge openings, the laser beam being irradiated from a side where the ink path is formed and in a discharge direction in which ink is discharged such that cross sections of said discharge openings decrease in the discharge direction;
• and
• convey means for conveying a recording medium to be recorded by ink discharged from said discharge openings of said ink jet head.

An ink jet head cartridge comprising:

• an ink jet head including:
• a first base plate provided with energy generating means for generating energy used for discharging ink,
• a second base plate provided with a recessed portion for forming a portion of an ink path, and
• a discharge opening member provided with discharge openings communicated with said ink path,
• wherein said ink path is formed by connecting said first base plate and said second base plate so that said energy generating means and said recessed portion are opposed to each other, said discharge openings and said ink path are communicated by integrally forming said discharge opening member with said second base plate, said discharge opening member and said first base plate abut one another, and the discharge openings are formed on the discharge opening member by irradiating a laser beam onto portions of the discharge opening member to be formed into the discharge openings, the laser beam being irradiated from a side where the ink path is formed and irradiated in a discharge direction in which ink is discharged such that cross sections of said discharge openings decrease in the discharge direction;
• and
• an ink tank for supplying ink to said ink path of said ink jet head.