Ink jet print head

An ink jet print head comprising:

• a substrate member formed with a heating resistor:
• for defining an ink supply path including a heating zone in a vicinity of the heating resistor;
• and
• an orifice plate member formed with an ink outlet communicating with the ink supply path and coupled to the ink path defining member,
• said ink jet print head generating heat from the heating resistor to discharge a drop of the ink outlet,
• said ink supply path having a fluid resistance so that a relationship is established such that:
• 0<h<0.24(q/A),
• where q is a quantity of the drop of the ink, A is a sectional area at an exit level of the ink outlet, and h is a maximum projection that a meniscus of the ink has when it projects from the ink outlet after it has restored the exit level from a retreat position it had after the drop of the ink had been discharged.

An ink-jet print head comprising:

• a substrate member formed with a heating resistor;
• an ink path defining member provided on the substrate member for defining an ink supply path including a heating zone in a vicinity of the heating resistor;
• and
• an orifice plate member formed with an ink outlet communicating with the ink supply path and coupled to the ink path defining member,
• said ink jet print head generating heat from the heating resistor to discharge a drop of the ink outlet,
• said ink jet print head generating heat from the heating resistor to discharge a drop of the ink outlet,
• said ink supply path having a fluid resistance so that a relationship is established such that:
• 0<h<0.21(q/A),
• where q is a quantity of the drop of the ink, A is a sectional area at an exit level of the ink outlet, and h is maximum projection that a meniscus of the ink has when it projects from the ink outlet after it has restored the exit level from a retreat position it had after the drop of the ink had been discharged.

An ink jet print head comprising:

• a substrate member formed with a heating resistor;
• an ink path defining member provided on the substrate member, for defining an ink supply path including a heating zone in a vicinity of the heating resistor, and
• an orifice plate member formed with an ink outlet communicating with the ink supply path and coupled to the ink path defining member,
• said ink jet print head generating heat from the heating resistor to discharge a drop of the ink outlet,
• said ink supply path having a fluid resistance so that a relationship is established such that:
• 0<h≦0.2(q/A),
• where q is a quantity of the drop of the ink, A is a sectional area at an exit level of the ink outlet, and h is a maximum projection that a meniscus of the ink has when it projects from the ink outlet after it has restored the exit level from a retreat position it had after the drop of the ink had been discharged.

An ink jet printing method for generating a drop of an ink from an ink outlet of an ink jet print head, said ink outlet being connected to an ink supply path on an substrate formed with a resistor in said ink jet printing head, said method comprising the steps of,

• heating said resistor for generating a bubble in said ink supply path to discharge the drop of the ink, and
• providing a fluid resistance in said ink supply path so that a relationship is established such that:
• 0<h<0.25(q/A),
• where q is a quantity of the drop of the ink, A is a sectional area at an exit level of the ink outlet, and h is a maximum projection that a meniscus of the ink has when it projects from the ink outlet after it has restored the exit level from a retreat position it had after the drop of the ink had been discharged.

An ink jet printing device for printing an image on a recording material by discharging a drop of an ink from an ink jet print head,

• wherein said ink-jet print head comprises;
• a substrate member formed with a heating resistor;
• an ink path defining member provided on the substrate member, for defining an ink supply path including a heating zone in a vicinity of the heating resistor;
• and
• an orifice plate member formed with an ink outlet communicating with the ink supply path and coupled to the ink path defining member,
• said ink jet print head generating heat from the heating resistor to discharge a drop of the ink outlet,
• said ink jet print head generating heat from the heating resistor to discharge a drop of the ink outlet,
• said ink supply path having a fluid resistance so that a relationship is established such that;
• 0<h<0.25(q/A),
• where q is a quantity of the drop of the ink, A is a sectional area at an exit level of the ink outlet, and h is a maximum projection that a meniscus of the ink has when it projects from the ink outlet after it has restored the exit level from a retreat position it had after the drop of the ink had been discharged.