Liquid ejection head and liquid ejection device

A liquid ejection head, comprising:

• a nozzle plate;
• a first plurality of nozzles in the nozzle plate arranged along a first direction;
• a second plurality of nozzles in the nozzle plate arranged along the first direction, the second plurality of nozzles being spaced from the first plurality of nozzles in a second direction perpendicular to the first;
• a first plurality of actuator grooves forming a first plurality of pressure chambers that are respectively fluidly connected to the first plurality of the nozzles, the actuator grooves in the first plurality of actuator grooves being spaced from one another in the first direction;
• a second plurality of actuator grooves forming a second plurality of pressure chambers that are respectively fluidly connected to the second plurality of the nozzles, the actuator grooves in the second plurality of actuator grooves being spaced from one another in the first direction;
• a central common flow channel between the first plurality of pressure chambers and the second plurality of pressure chambers in the second direction;
• a first outer common flow channel adjacent to open ends of the actuator grooves of the first plurality of actuator grooves in the second direction;
• a second outer common flow channel adjacent to open ends of the actuator grooves of the second plurality of actuator grooves in the second direction, the central common flow channel being between the first and second outer common flow channels in the second direction;
• and
• a liquid supply opening fluidly connected to the central common flow channel, wherein
• the central common flow channel is fluidly connected to the first and second outer common flow channels,
• the nozzle plate is a flexible film having a Young's modulus equal to or higher than 9.1 gigapascals (GPs), and
• when a thickness, in millimeters, of the nozzle plate in a third direction orthogonal to the nozzle plate is T, the relationship between a maximum supply distance, in millimeters, L, which is a distance along the first direction in the first or second outer common flow channel between a supply part, where the liquid is supplied to the first or second outer common flow channel to a farthest one of the actuator grooves in the respective first or second plurality of actuator grooves, and a flow channel width, in millimeters, W, where flow channel width is a dimension in the second direction of the first or second outer common flow channel, satisfies:
• L
• ≥
• (
• -
• 372.02
• ⁢
• T
• +
• 26.0415
• )
• ⁢
• W
• 2
• +
• (
• 47.616
• T
• -
• 4.7618
• )
• ⁢
• W
• +
• 7.1429
• .

A liquid ejection device, comprising:

• a sheet conveying device;
• an inkjet head configured to eject liquid onto a sheet conveyed by the sheet conveying device, the inkjet head including:
• a nozzle plate;
• a plurality of nozzles in the nozzle plate;
• a plurality of actuator grooves forming a plurality of pressure chambers that are respectively fluidly connected to the plurality of the nozzles, the actuator grooves being spaced from one another in a first direction parallel to the nozzle plate;
• a common flow channel adjacent to open ends of the actuator grooves in a second direction parallel to the nozzle plate and perpendicular to the first direction;
• and
• a liquid supply opening fluidly connected to the common flow channel, wherein
• the nozzle plate is a flexible film having a Young's modulus equal to or higher than 9.1 gigapascals (GPs), and
• when a thickness, in millimeters, of the nozzle plate in a third direction orthogonal to the nozzle plate is T, the relationship between a maximum supply distance, in millimeters, L, which is a distance along the first direction in the common flow channel between a supply part, where the liquid is supplied to the common flow channel to a farthest one of the actuator grooves, and a flow channel width, in millimeters, W, where flow channel width is a dimension in the second direction of the common flow channel, satisfies:
• L
• ≥
• (
• -
• 372.02
• ⁢
• T
• +
• 26.0415
• )
• ⁢
• W
• 2
• +
• (
• 47.616
• T
• -
• 4.7618
• )
• ⁢
• W
• +
• 7.1429
• .