Patent ID: 9022515
Filing Date: 2015-05-05
Classification: B41J

Abstract:
1. A method for measuring a response to actuation of an electro-mechanical transducer in a print head assembly for an inkjet printing system, comprising: providing at least a portion of a return path to system ground for an electro-mechanical transducer through a sensing circuit, wherein the electro-mechanical transducer is associated with an ink chamber in a print head assembly for an inkjet printing system, wherein the electro-mechanical transducer is configured to transfer energy to contents of the ink chamber in response to an actuation of the electro-mechanical transducer in conjunction with electronics controller and waveform amplifier modules of the inkjet printing system; monitoring a ground signal from an electro-mechanical transducer-side of the sensing circuit at a first stage amplifier circuit of a measurement circuit; monitoring a reference signal from a system ground-side of the sensing circuit at the first stage amplifier circuit; generating a difference signal indicative of a difference between the ground and reference signals at the first stage amplifier circuit; and conditioning and amplifying the difference signal at second and third stage amplifier circuits of the measurement circuit to generate a response signal indicative of a response of the electro-mechanical transducer to fluidic pressure waves within the ink chamber after actuation of the electro-mechanical transducer, the conditioning and amplifying comprising: