Liquid discharge head, liquid discharge apparatus, and nozzle substrate

A nozzle substrate having a nozzle row constituted with a plurality of nozzles from which liquid is discharged, comprising:

• a first nozzle that is one of the plurality of nozzles;
• and
• a second nozzle that is one of the plurality of nozzles, wherein
• the first nozzle includes a first downstream nozzle portion opened on a discharge surface of the nozzle substrate and a first upstream nozzle portion of which a cross-sectional area is larger than a cross-sectional area of the first downstream nozzle portion when viewed in a thickness direction of the nozzle substrate and that is positioned upstream of the first downstream nozzle portion,
• the second nozzle includes a second downstream nozzle portion opened on the discharge surface and a second upstream nozzle portion of which a cross-sectional area is larger than a cross-sectional area of the second downstream nozzle portion when viewed in the thickness direction and that is positioned upstream of the second downstream nozzle portion,
• the first nozzle is positioned at a center of the nozzle row,
• the second nozzle is positioned at an end of the nozzle row
• all nozzles positioned between the first nozzle and the second nozzle in an arrangement direction in which the plurality of nozzles are arranged, each includes a downstream nozzle portion opened on a discharge surface of the nozzle substrate and an upstream nozzle portion of which a cross-sectional area is larger than a cross-sectional area of the downstream nozzle portion when viewed in a thickness direction of the nozzle substrate and that is positioned upstream of the downstream nozzle portion,
• in a case where, when viewed in the thickness direction, a distance between a gravity center position of the first downstream nozzle portion and a gravity center position of the first upstream nozzle portion is set as a first distance,
• when viewed in the thickness direction, a distance between a gravity center position of the second downstream nozzle portion and a gravity center position of the second upstream nozzle portion is set as a second distance,
• when viewed in the thickness direction, for each of the nozzles between the first nozzle and the second nozzle, a distance between a respective gravity center position of the downstream nozzle portion and a respective gravity center position of the upstream nozzle portion is set as an eighth distance,
• the eighth distance for all nozzles positioned between the first nozzle and the second nozzle in the arrangement direction is longer than the first distance and shorter than the second distance, and
• the eighth distance is distance in an arrangement direction in which the plurality of nozzles is arranged.

A liquid discharge head comprising:

• a first driving element;
• a second driving element;
• a first pressure chamber that is partitioned on a pressure chamber substrate and imparts pressure to liquid by driving the first driving element;
• a second pressure chamber that is partitioned on the pressure chamber substrate and imparts pressure to liquid by driving the second driving element;
• a first nozzle that is one of a plurality of nozzles included in a nozzle row formed on a nozzle substrate and communicates with the first pressure chamber;
• and
• a second nozzle that is one of the plurality of nozzles and communicates with the second pressure chamber, wherein
• the first nozzle is positioned closer to a center of the nozzle row than the second nozzle,
• the second nozzle is positioned closer to an end of the nozzle row than the first nozzle,
• the nozzle substrate has a discharge surface positioned opposite to the pressure chamber substrate,
• the first nozzle includes a first downstream nozzle portion opened on the discharge surface and a first upstream nozzle portion of which a cross-sectional area is larger than a cross-sectional area of the first downstream nozzle portion when viewed in a thickness direction of the nozzle substrate and that is positioned upstream of the first downstream nozzle portion,
• the second nozzle includes a second downstream nozzle portion opened on the discharge surface and a second upstream nozzle portion of which a cross-sectional area is larger than a cross-sectional area of the second downstream nozzle portion when viewed in the thickness direction and that is positioned upstream of the second downstream nozzle portion,
• in a case where, when viewed in the thickness direction, a distance between a gravity center position of the first downstream nozzle portion and a gravity center position of the first upstream nozzle portion is set as a first distance, and, when viewed in the thickness direction, a distance between a gravity center position of the second downstream nozzle portion and a gravity center position of the second upstream nozzle portion is set as a second distance, the second distance is longer than the first distance,
• the first distance and the second distance are distances in an arrangement direction in which the plurality of nozzles are arranged, and
• in the arrangement direction, a gravity center of the second downstream nozzle portion is closer to the center of the nozzle row than a gravity center of the second upstream nozzle portion.