Piezoelectric jetting system and method

Patent metadata

Field	Value
Publication number	US-10090453-B2
Application number	US-201615154021-A
Country	US
Kind code	B2
Filing date	May 13, 2016
Priority date	May 22, 2015
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

A system and method for jetting a viscous material includes an electronic controller and a jetting dispenser operatively coupled with the electronic controller. The jetting dispenser includes an outlet orifice and a piezoelectric actuator operatively coupled with a movable shaft. The jetting dispenser is under control of the electronic controller for causing said piezoelectric actuator to move the shaft and jet an amount of the viscous material from the outlet orifice. The electronic controller sends a waveform to the piezoelectric actuator to optimize control of the jetting operation.

First claim

What is claimed is:

1. A method for jetting a fluid from a jetting dispenser including a piezoelectric actuator operatively coupled, via a mechanical amplifier, to a movable shaft and a fluid body with an outlet orifice, the method comprising:
applying, via an electronic controller, a voltage with a varying rate of change to the piezoelectric actuator;
moving the piezoelectric actuator under the applied voltage with the varying rate of change to move, via the mechanical amplifier, the movable shaft with reduced oscillation amplitude of the movable shaft during movement toward and/or away from the outlet orifice; and
jetting an amount of the fluid from said outlet orifice using the movable shaft.

2. The method of claim 1 , wherein applying the voltage comprises applying a stepped waveform to the piezoelectric actuator including a first voltage and a second voltage, the second voltage being different than the first voltage.

3. The method of claim 2 , wherein said second voltage is lower than said first voltage.

4. The method of claim 3 , wherein said second voltage is 0 volts.

5. The method of claim 3 , wherein said stepped waveform further includes a third voltage, said third voltage being greater than said second voltage and following said second voltage in said stepped waveform.

6. The method of claim 2 , wherein applying the stepped waveform to the piezoelectric actuator comprises reducing the voltage applied to the piezoelectric actuator in a stepped manner by reducing the voltage to the first voltage and then applying the second voltage that is lower than the first voltage.

7. The method of claim 1 , wherein applying the voltage comprises applying the voltage with a decreasing rate of change.

8. The method of claim 1 , wherein applying the voltage comprises applying the voltage with an increasing rate of change.

Assignees

• Nordson Corp

Inventors

• Conner Scott A
• Jones John D
• Teece Bryan
• Villegas Wilson A

Classifications

• B05C5/0225 Primary

  characterised by flow controlling means, e.g. valves, located proximate the outlet (B05C5/0258, B05C5/0275 take precedence; supply valves upstream the coating head B05C11/1036) · CPC title

• H01L41/042 Primary

  Electricity · mapped topic

• B23K1/0016

  Soldering of electronic components · CPC title

• H05K3/16

  by cathodic sputtering · CPC title

• B05B12/02

  for controlling time, or sequence, of delivery · CPC title