US 12,220,913 B2
Liquid ejection head
Mineo Shimotsusa, Tokyo (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Sep. 14, 2022, as Appl. No. 17/932,220.
Claims priority of application No. JP2021-151989 (JP), filed on Sep. 17, 2021.
Prior Publication US 2023/0088227 A1, Mar. 23, 2023
Int. Cl. B41J 2/045 (2006.01)
CPC B41J 2/04563 (2013.01) [B41J 2/0458 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A liquid ejection head comprising:
a base substrate;
an ejection port configured to eject a liquid;
a first heating element formed above the base substrate, wherein the first heating element heats the liquid to eject the liquid from the ejection port;
a temperature detection element formed above the base substrate, wherein the temperature detection element detects a temperature of the liquid;
a second heating element formed under the temperature detection element;
a protective layer formed on the base substrate, wherein the protective layer protects the first heating element; and
a liquid supply port configured to penetrate the base substrate, wherein the liquid supply port supplies the liquid to the first heating element,
wherein when viewed in a direction perpendicular to the base substrate, the temperature detection element is disposed between the first heating element and the liquid supply port,
wherein, when viewed in the direction perpendicular to the base substrate, the second heating element and the temperature detection element overlap at least partially, and
wherein the temperature detection element is formed on the protective layer.