US 12,076,992 B2
Liquid discharge head, liquid discharge device, and liquid discharge apparatus
Toshiaki Masuda, Kanagawa (JP)
Assigned to RICOH COMPANY, LTD., Tokyo (JP)
Filed by Toshiaki Masuda, Kanagawa (JP)
Filed on Oct. 13, 2022, as Appl. No. 17/964,963.
Claims priority of application No. 2021-182690 (JP), filed on Nov. 9, 2021.
Prior Publication US 2023/0146297 A1, May 11, 2023
Int. Cl. B41J 2/14 (2006.01)
CPC B41J 2/14233 (2013.01) [B41J 2002/14491 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A liquid discharge head comprising:
a chamber substrate;
a diaphragm on the chamber substrate;
a lower electrode on the diaphragm;
a piezoelectric member on the lower electrode;
an upper electrode on the piezoelectric member;
wiring electrically connected to the upper electrode to transmit driving signal to the piezoelectric member; and
a nozzle substrate having a nozzle,
wherein the chamber substrate includes an individual chamber facing the diaphragm,
the individual chamber has a polygonal shape having four or more sides,
the piezoelectric member has a polygonal shape having four or more sides,
the wiring covers a middle point of a first side of the four or more sides of the individual chamber, and
a distance A is smaller than a distance B,
where the distance A is between a first end portion of the individual chamber and a second end portion of the piezoelectric member in a second side of the four or more sides in which a distance L is the largest, and
a distance B is between a third end portion of the individual chamber and a fourth end portion of the piezoelectric member in a third side of the four or more sides in which the distance L is the smallest, and
the distance L is a distance from the middle point of the first side to each of middle points of the four or more sides other than the first side.