US 12,240,240 B2
Liquid ejection head
Tsubasa Konishi, Sunto Shizuoka (JP); and Akimasa Toyama, Yokohama Kanagawa (JP)
Assigned to RISO Technologies Corporation, Tokyo (JP)
Filed by RISO Technologies Corporation, Tokyo (JP)
Filed on Jun. 8, 2022, as Appl. No. 17/835,922.
Claims priority of application No. 2021-203038 (JP), filed on Dec. 15, 2021.
Prior Publication US 2023/0182467 A1, Jun. 15, 2023
Int. Cl. B41J 2/14 (2006.01)
CPC B41J 2/14201 (2013.01) [B41J 2/14209 (2013.01); B41J 2002/14491 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A liquid ejection head, comprising:
a nozzle plate including a nozzle from which a liquid can be ejected;
a substrate facing the nozzle plate;
an actuator disposed on the substrate, the actuator including a pressure chamber connected to the nozzle and configured to change a volume of the pressure chamber according to an electrical signal applied to the actuator, wherein the actuator includes an upper surface and a side surface connecting the upper surface to the substrate, the side surface being inclined with respect to the substrate at an inclination angle θ between 45 and 90 degrees; and
an electrode connected to the pressure chamber through which the electrical signal is supplied, wherein
the electrode extends along a first direction parallel to the substrate and includes a first wiring on the side surface and a second wiring on the substrate within a first region of the substrate, wherein a length of the second wiring in the first region is greater than an entire length of the first wiring, and the first and second wirings extend continuously along the same straight line when viewed from a second direction perpendicular to the substrate, and
the first region has a length A in the first direction from a line along which the upper surface and the side surface are connected, when viewed along the second direction, and the length A is the value B divided by tan θ′, where B is a distance between the upper surface and the substrate and θ′ is (θ−45 degrees)×2.