Measurement of the Displacement of a Shear Mode Piezoelectric Transducer Using Laser Doppler Vibrometer

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The ink jet print heads produced by Spectra utilize piezoelectric material's shear mode movement to deflect one pressure chamber wall, generating a pressure differential for the ejection of a drop of ink from the orifice connected with the pressure chamber. The responses of a piezoelectric transducer to the applied voltages determine the characteristics of pressure pulses that drive the jets. Direct measurement of the dynamic responses of piezoelectric transducer can provide valuable information not only for a better understanding of the shear mode movement, but also for the optimization of a print head design. It also provides reliable information to verify numerical models that can be applied quickly to various aspects of future printhead development work. However, owing to high operating frequency and tiny shear mode movement of the piezoelectric transducer the measurement is often challenging.

This paper investigates the capability of laser Doppler vibrometer in measuring the displacement of Spectra's shear mode piezoelectric transducer. Measurements have been conducted on a fully functional 128 jets, 600 dpi commercial compact print head (CCP128/600). Displacements smaller than 0.02 μm at high jetting frequency have been successfully measured. It has been demonstrated that laser Doppler vibrometer can be effectively used to evaluate printhead dynamics, identify potential problems, verify numerical models and optimize the printhead designs.

Document Type: Research Article

Publication date: January 1, 1998

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  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.

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