Liquid ejection head, liquid ejection apparatus, and control method

A liquid ejection apparatus comprising:

• a liquid ejection head including a wall member for partitioning a first liquid chamber and a second liquid chamber adjacent to each other and forming the first liquid chamber and the second liquid chamber, the wall member having formed therein a void for communicating between the first liquid chamber and the second liquid chamber;
• a first energy generation element which is provided in the first liquid chamber and foams liquid in order to eject the liquid;
• a second energy generation element which is provided in the second liquid chamber and foams liquid in order to eject the liquid;
• a first electrode which is provided in the first liquid chamber and is arranged in a vicinity of the first energy generation element;
• a second electrode which is provided in the first liquid chamber and is for forming, between the first electrode and the second electrode, an electric field in liquid inside the first liquid chamber;
• and a supply port which supplies liquid to the first energy generation element, wherein the wall member includes a channel wall defining a channel through which the second liquid chamber, the void, and the supply port communicate, in this order, with each other via liquid, and the second electrode is arranged between the second liquid chamber and the supply port in the channel;
• a detection unit configured to detect a bubble between the first electrode and the second electrode in the first liquid chamber;
• and
• a generation unit configured to generate, in a case where the detection unit detects a bubble, a flow of liquid moving toward the first liquid chamber via the void from the second liquid chamber.

A control method of a liquid ejection head, the liquid ejection head including a wall member for partitioning a first liquid chamber and a second liquid chamber adjacent to each other and forming the first liquid chamber and the second liquid chamber, the wall member having formed therein a void for communicating between the first liquid chamber and the second liquid chamber;

• a first energy generation element which is provided in the first liquid chamber and foams liquid in order to eject the liquid;
• a second energy generation element which is provided in the second liquid chamber and foams liquid in order to eject the liquid;
• a first electrode which is provided in the first liquid chamber and is arranged in a vicinity of the first energy generation element;
• a second electrode for forming, between the first electrode and the second electrode, an electric field in liquid inside the first liquid chamber;
• and a supply port which supplies liquid to the first energy generation element, wherein the wall member includes a channel wall defining a channel through which the second liquid chamber, the void, and the supply port communicate, in this order, with each other via liquid, and the second electrode is arranged between the second liquid chamber and the supply port in the channel, the method comprising the step of:
• generating a flow of liquid which moves toward the supply port past the second electrode via the void from the second liquid chamber.