Method of drop size modulation with extended transition time waveform
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United States of America Patent
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Feb 29, 2000
Grant Date -
N/A
app pub date -
Sep 30, 1997
filing date -
Sep 30, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention uses a novel waveform to allow the droplet volume dispensed from a demand mode inkjet type device to be increased and selected according to easily controllable parameters. The current invention departs from the conventional drive method by significantly increasing the time for energy input in the initial instance as well is in all later application of the drive voltage to the device. In shape, the waveform is the same whether a unipolar or bipolar pulse is utilized; however, the transition times in the initial instance are up to three times the acoustic resonance and the delay times are of the same order. Droplet diameter can be varied from 1X the orifice diameter to 2X the orifice diameter resulting in an 8:1 range of droplet volume. Since the volume modulation results from changes in the waveform used to drive the solder jet device, the drop volume can be changed and altered in real time.
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