Liquid ejection apparatus, liquid ejection head, liquid ejection head control device, and liquid ejection head controlling method

A liquid ejection head control device configured to control a liquid ejection head for ejecting a liquid to a print medium,

• the liquid ejection head comprising:
• a plurality of ejection ports configured to eject the liquid;
• a plurality of pressure chambers communicating with the plurality of ejection ports;
• a plurality of ejection energy generating elements configured to generate energy for ejecting the liquid being present in the plurality of pressure chambers from the plurality of ejection ports;
• a plurality of circulation energy generating elements configured to generate energy for circulating the liquid being present in the plurality of pressure chambers inside the liquid ejection head;
• and
• a unit configured to input a plurality of ejection energy generating element selection signals, a plurality of ejection time-division selection signals, and a circulation cycle control signal,
• wherein the liquid is circulated by driving the circulation energy generating element selected by the circulation energy generation element selection signal and the circulation time-division selection signal, and
• wherein the liquid ejection head control device includes a generating unit configured to generate the circulation cycle control signal such that a cycle of a plurality of circulation time-division selection signals is equal to or longer than a cycle of the plurality of ejection time-division selection signals.

A liquid ejection head configured to eject a liquid to a print medium, wherein

• the liquid ejection head is controlled by a liquid ejection head control device,
• the liquid ejection head comprising:
• a plurality of ejection ports configured to eject the liquid;
• a plurality of pressure chambers communicating with the plurality of ejection
• ports;
• a plurality of ejection energy generating elements configured to generate energy for ejecting the liquid being present in the plurality of pressure chambers from the plurality of ejection ports;
• a plurality of circulation energy generating elements configured to generate energy for circulating the liquid being present in the plurality of pressure chambers inside the liquid ejection head;
• and
• a unit configured to input a plurality of ejection energy generating element selection signals, a plurality of ejection time-division selection signals, and a circulation cycle control signal,
• wherein the liquid ejection head circulates the liquid by driving the circulation energy generating element selected by the circulation energy generation element selection signal and the circulation time-division selection signal, and
• wherein the liquid ejection head control device includes a generating unit configured to generate the circulation cycle control signal such that a cycle of a plurality of circulation time-division selection signals is equal to or longer than a cycle of the plurality of ejection time-division selection signals.

A liquid ejection head controlling method for controlling a liquid ejection head configured to eject a liquid to a print medium,

• the liquid ejection head comprising:
• a plurality of ejection ports configured to eject the liquid;
• a plurality of pressure chambers communicating with the plurality of ejection ports;
• a plurality of ejection energy generating elements configured to generate energy for ejecting the liquid being present in the plurality of pressure chambers from the plurality of ejection ports;
• a plurality of circulation energy generating elements configured to generate energy for circulating the liquid being present in the plurality of pressure chambers inside the liquid ejection head;
• and
• a unit configured to input a plurality of ejection energy generating element selection signals, a plurality of ejection time-division selection signals, and a circulation cycle control signal,
• wherein the liquid is circulated by driving the circulation energy generating element selected by the circulation energy generation element selection signal and the circulation time-division selection signal, and
• wherein the liquid ejection head controlling method includes the step of generating the circulation cycle control signal such that a cycle of a plurality of circulation time-division selection signals is equal to or longer than a cycle of the plurality of ejection time-division selection signals.