A liquid ejection head in which a plurality of ejection nozzles is arranged in a first direction includes: a first flow passage communicating with one end of each of a plurality of individual flow passages; a second flow passage communicating with the other end of each of the plurality of individual flow passages; a plurality of first openings provided in the first flow passage; and a plurality of second openings provided in the second flow passage, in which D2>D1, in which D1 represents a size of a non-open part in a first direction between the two adjacent first openings, and D2 represents a size of a non-open part in the first direction between the two adjacent second openings.

A liquid ejection head in which a plurality of ejection nozzles is arranged in a first direction includes: a first flow passage communicating with one end of each of a plurality of individual flow passages; a second flow passage communicating with the other end of each of the plurality of individual flow passages; a plurality of first openings provided in the first flow passage; and a plurality of second openings provided in the second flow passage, in which D2>D1, in which D1 represents a size of a non-open part in a first direction between the two adjacent first openings, and D2 represents a size of a non-open part in the first direction between the two adjacent second openings.

The pressure fluctuation of ink can be suppressed even with a simple structure. A print head of a drawing machine includes a first port that receives supply of ink from an ink tank, a second port that discharges ink, a pressure fluctuation adjustment section, and a third port that receives air supply to the pressure fluctuation adjustment section. The drawing machine includes an electromagnetic valve that opens and closes an air flow path for supplying air to the pressure fluctuation adjustment section via the third port. When the print head does not eject ink, the electromagnetic valve is opened to enable air to be supplied into the pressure fluctuation adjustment section.

The pressure fluctuation of ink can be suppressed even with a simple structure. A print head of a drawing machine includes a first port that receives supply of ink from an ink tank, a second port that discharges ink, a pressure fluctuation adjustment section, and a third port that receives air supply to the pressure fluctuation adjustment section. The drawing machine includes an electromagnetic valve that opens and closes an air flow path for supplying air to the pressure fluctuation adjustment section via the third port. When the print head does not eject ink, the electromagnetic valve is opened to enable air to be supplied into the pressure fluctuation adjustment section.

An object of the present disclosure is to provide a printing element substrate on which printing elements, circulation elements, and wiring lines are arranged efficiently. The printing element substrate includes a first unit including a first element and a second element, a second unit including a third element and a fourth element, and a power supply wiring line including a first portion and a second portion. The power supply wiring line includes an extension portion that extends along a boundary line between the first unit and the second unit. The first element and the third element are arranged symmetrically with respect to the extension portion. The second element and the fourth element are arranged symmetrically with respect to the extension portion. The first portion and the second portion are arranged symmetrically with respect to the extension portion.

An object of the present disclosure is to provide a printing element substrate on which printing elements, circulation elements, and wiring lines are arranged efficiently. The printing element substrate includes a first unit including a first element and a second element, a second unit including a third element and a fourth element, and a power supply wiring line including a first portion and a second portion. The power supply wiring line includes an extension portion that extends along a boundary line between the first unit and the second unit. The first element and the third element are arranged symmetrically with respect to the extension portion. The second element and the fourth element are arranged symmetrically with respect to the extension portion. The first portion and the second portion are arranged symmetrically with respect to the extension portion.

A heater control device is a heater control device which controls a heater that heats ink supplied from an ink container storing the ink to a recording head, and includes a control portion. The control portion controls, when the heater is in an operation state, the heater at a first output, and executes, when the heater is switched from a non-operation state to the operation state, output augmentation control for controlling the heater at a second output larger than the first output until a predetermined time elapses since the switch.

A heater control device is a heater control device which controls a heater that heats ink supplied from an ink container storing the ink to a recording head, and includes a control portion. The control portion controls, when the heater is in an operation state, the heater at a first output, and executes, when the heater is switched from a non-operation state to the operation state, output augmentation control for controlling the heater at a second output larger than the first output until a predetermined time elapses since the switch.

A liquid ejecting head includes a plurality of nozzles that eject a liquid, a plurality of pressure chambers to which a pressure for ejecting the liquid from each of the plurality of nozzles is applied and that are arranged in a first direction, a first liquid chamber disposed in the first direction with respect to a first pressure chamber located at an end of the plurality of pressure chambers in the first direction, a first vibration plate that defines a portion of the first liquid chamber, a manifold commonly coupled to the plurality of pressure chambers and the first liquid chamber, and a strain gauge for acquiring a pressure within the first liquid chamber, the strain gauge corresponding to the first vibration plate.

A liquid ejecting head includes a plurality of nozzles that eject a liquid, a plurality of pressure chambers to which a pressure for ejecting the liquid from each of the plurality of nozzles is applied and that are arranged in a first direction, a first liquid chamber disposed in the first direction with respect to a first pressure chamber located at an end of the plurality of pressure chambers in the first direction, a first vibration plate that defines a portion of the first liquid chamber, a manifold commonly coupled to the plurality of pressure chambers and the first liquid chamber, and a strain gauge for acquiring a pressure within the first liquid chamber, the strain gauge corresponding to the first vibration plate.