Liquid discharge method and liquid discharge apparatus for heating a liquid through a surface to generate a bubble

A liquid discharge method of discharging liquid with a liquid discharge head having a heating surface that contacts and heats the liquid, a discharge port that faces the heating surface and discharges the liquid, and a heating portion configured to generate thermal energy that is used to heat the liquid through the heating surface, the method comprising:

• heating, by applying a first voltage pulse to the heating portion, the liquid through the heating surface to generate a bubble, thereby discharging the liquid from the discharge port;
• and
• heating, by applying a second voltage pulse to the heating portion, a trailing portion of the liquid that is being discharged from the discharge port and is in contact with the heating surface through the heating surface, thereby discharging the trailing portion from the discharge port.

A liquid discharge method of discharging liquid with a liquid discharge head having at least one first heating surface and a second heating surface that are arranged parallel to each other and that contact and heat the liquid and a discharge port that faces the at least one first heating surface and the second heating surface and that discharges the liquid, the method comprising:

• heating the liquid through at least the at least one first heating surface to generate a bubble such that the bubble communicates with an atmosphere, thereby discharging the liquid, wherein the liquid that is being discharged from the discharge port includes a trailing portion, the trailing portion moves toward the second heating surface in response to a reduction in volume of the bubble, and the trailing portion contacts the second heating surface;
• and
• heating the trailing portion through the second heating surface while the trailing portion is in contact with the second heating surface, thereby generating a bubble.

A liquid discharge method of discharging liquid with a liquid discharge head having a first heating surface and a second heating surface that are arranged parallel to each other and that contact and heat the liquid, and a discharge port that faces the first and second heating surfaces and discharges the liquid, the method comprising:

• heating the liquid through at least the first heating surface to generate a bubble, thereby discharging the liquid from the discharge port;
• and
• heating a trailing portion of the liquid that is being discharged from the discharge port through the second heating surface while the trailing portion is in contact with the second heating surface, thereby discharging the trailing portion from the discharge port.

A liquid discharge apparatus comprising:

• a liquid discharge head including a heating portion configured to generate thermal energy, the liquid discharge head having a heating surface to contact liquid and heat the liquid with the thermal energy generated by the heating portion and a discharge port that faces the heating surface and is configured to discharge the liquid;
• and
• a driving unit configured to drive the heating portion such that, by applying a first voltage pulse to the heating portion a bubble that causes the liquid to be discharged is generated, and, by applying a second voltage pulse to the heating portion, a trailing portion of the liquid that is being discharged from the discharge port and is in contact with the heating surface is heated through the heating surface to discharge the trailing portion from the discharge port.