US 12,257,835 B2
Liquid discharge head and liquid discharge apparatus
Hidetoshi Migita, Kanagawa (JP)
Assigned to Ricoh Company, Ltd., Tokyo (JP)
Filed by Hidetoshi Migita, Kanagawa (JP); and Ricoh Company, Ltd., Tokyo (JP)
Filed on Mar. 6, 2023, as Appl. No. 18/178,833.
Claims priority of application No. 2022-037260 (JP), filed on Mar. 10, 2022; and application No. 2022-193727 (JP), filed on Dec. 2, 2022.
Prior Publication US 2023/0286268 A1, Sep. 14, 2023
Int. Cl. B41J 2/045 (2006.01)
CPC B41J 2/04588 (2013.01) [B41J 2/04541 (2013.01); B41J 2/04581 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A liquid discharge head comprising:
a nozzle layer including a piezoelectric layer and having a nozzle penetrating through the nozzle layer;
a liquid chamber communicating with the nozzle; and
a drive circuit configured to apply a drive waveform to the piezoelectric layer to drive the piezoelectric layer, the drive waveform having:
a first waveform having a first voltage to discharge a liquid in the liquid chamber from the nozzle, the first voltage having a first rising edge from which the first voltage rises; and
a second waveform having a second voltage having a second rising edge from which the second voltage rises, the second rising edge delayed from the first rising edge by (m−0.5)×Tc,
where m represents a positive integer, and
Tc represents a natural period of vibration of the piezoelectric layer.