US 12,358,301 B2
Active mixer in jetting channels of a printhead
Nasser Budraa, La Crescenta, CA (US)
Assigned to Ricoh Company Ltd., Tokyo (JP)
Filed by Nasser Budraa, La Crescenta, CA (US)
Filed on Feb. 16, 2023, as Appl. No. 18/110,813.
Prior Publication US 2024/0278583 A1, Aug. 22, 2024
Int. Cl. B41J 2/21 (2006.01); B41J 2/14 (2006.01)
CPC B41J 2/211 (2013.01) [B41J 2002/14193 (2013.01); B41J 2002/14467 (2013.01); B41J 2002/14483 (2013.01); B41J 2202/19 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A printhead comprising:
a plurality of jetting channels, wherein each jetting channel of the plurality includes:
a diaphragm, a pressure chamber, and a nozzle configured to jet a print fluid; and
one or more intra-chamber active mixers disposed in the pressure chamber;
wherein an intra-chamber active mixer comprises:
a cantilever having a connected end rigidly connected to a vertical side wall of the pressure chamber, and a free end that is free to move;
wherein characteristics of the intra-chamber active mixer are selected so that a resonance frequency of the intra-chamber active mixer differs from a Helmholtz frequency of the jetting channel.