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Research Papers

Experimental Analysis of a Novel Piezoelectric Jetting System for Micrograms Deposition in Electronic Assemblies

[+] Author and Article Information
Rajiv L. Iyer

Systems Science and Industrial
Engineering Department,
Binghamton University,
State University of New York,
Binghamton, NY 13902
e-mail: riyer1@binghamton.edu

Daryl L. Santos

Systems Science and Industrial
Engineering Department,
Binghamton University,
State University of New York,
Binghamton, NY 13902
e-mail: santos@binghamton.edu

Contributed by the Electronic and Photonic Packaging Division of ASME for publication in the JOURNAL OF ELECTRONIC PACKAGING. Manuscript received January 30, 2017; final manuscript received May 31, 2017; published online July 14, 2017. Assoc. Editor: Xiulin Ruan.

J. Electron. Packag 139(3), 031009 (Jul 14, 2017) (10 pages) Paper No: EP-17-1012; doi: 10.1115/1.4037144 History: Received January 30, 2017; Revised May 31, 2017

Over the past ten years, there has been an exponential growth in innovations and designs to offer cutting edge electronic devices that are smaller, faster, with advanced features built in. The existence of smartphones, wearable devices, tablets, etc., is the evidence of these advancements. Original equipment manufacturers are looking for processes in electronic assemblies that can offer high‐speed, high accuracy, and fine droplet mass deposition to address the challenges of product miniaturization, high-density component packaging, and complex designs. This work presents a novel piezoelectric-driven jetting system that is designed to dispense small droplet masses with high accuracy and speed. The system is referred to as “novel” because, in the contact style jetting arena, the piezoelectric drive assembly for use to drive the motion of the piston assembly at high frequencies (up to 500 Hz) is new; furthermore, the piston motion tracking feature is patent pending of. Using a split-plot design of experiments (DOE) model, the jetting system is studied to understand the influence of critical designs introduced and to further review the smallest droplet mass possible to reliably dispense. This experimental analysis uses some of the widely used adhesives in the electronics assembly applications.

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References

Figures

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Fig. 1

Cross-sectional layout of piezoelectric jetting pump

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Fig. 2

Cross-sectional view of fluidics unit used in jetting pump

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Fig. 3

Cross-sectional view—surface contact of piston with seat assembly

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Fig. 4

Goodness-of-fit results: (a) probability plot of data with 1000 μm piston and (b) probability of data with 1350 μm piston

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Fig. 5

Boxplot results on mass per droplet with 1000 μm and 1350 μm piston ball diameter

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Fig. 6

Mass per droplet with 80 μm and 160 μm nozzle diameter

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Fig. 7

Type 1 gage study results (P/T ratio)—weight scale

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Fig. 8

Half normal plots: (a) HTC factors and (b) other factors

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Fig. 9

Dot quality index: (a) index = 1 (bad dispense), (b) index = 5 (acceptable), and (c) index = 10 (ideal)

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Fig. 10

Optimization plot—multiple responses

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