Patent ID: 9162457
Filing Date: 2015-10-20
Classification: B41J

Abstract:
1. A printhead comprising: a reservoir having a housing with a volume for containing a fluid; a plurality of apertures in a nozzle plate of the housing that are pneumatically connected to the volume within the housing; a plurality of chambers, each chamber having a wall that encloses a volume that is connected pneumatically with the volume within the housing, the chambers being arranged vertically within the volume, each chamber having a first end and a second end, the first end being a closed end that communicates with a first passageway that is narrower than the chamber and the second end being a closed end that communicates with a second passageway that is narrower than the chamber; a plurality of piezoelectric transducers, each chamber having one of the piezoelectric transducers mounted to the wall of the chamber in a one-to-one correspondence; and at least one electrical conductor electrically connected to each piezoelectric transducer in the plurality of piezoelectric transducers to enable each piezoelectric sensor to receive an electrical signal to bend a portion of the wall of the chamber on which the piezoelectric transducer is located to produce an acoustical wave in the chamber and to transmit an electrical signal from each piezoelectric transducer in response to a fluctuating pressure on each piezoelectric transducer produced by the acoustical wave.