Method and apparatus for fluid dispensing using curvilinear drive waveforms
View Patent ↗A drive signal is generated having at least one pulsed curvilinear waveform shape. This drive signal is applied to a fluid dispenser to cause fluid ejection. Additionally, a drive signal is generated having one or more non-sinusoidal curvilinear waveform shapes. This drive signal is applied to a fluid dispenser to cause fluid ejection. Still further, a drive signal is generated having multiple segments including at least one segment having a curvilinear waveform shape. This drive signal is applied to a fluid dispenser to cause fluid ejection.
1. An apparatus comprising:
a waveform generator that is configurable to generate a selected one of a plurality of curvilinear waveform shapes;
a driver that generates a pulsed drive signal having the selected curvilinear waveform shape;
a processor executing processor instructions using a decision tree to identify the selected curvilinear waveform shape based on selection specifications; and
a dispenser that responds to the pulsed drive signal to eject fluid.
2. The apparatus of claim 1 wherein the dispenser is a piezoelectrically actuated dispenser.
3. The apparatus of claim 2 wherein the piezoelectrically actuated dispenser is a Piezo Tip.
4. The apparatus of claim 2 wherein the piezoelectrically actuated dispenser is an ink jet dispenser.
5. The apparatus of claim 2 wherein the piezoelectrically actuated dispenser is a drop-on-demand dispenser.
6. The apparatus of claim 1 wherein the dispenser is a piezoelectrically actuated continuous jet device.
7. The apparatus of claim 1 wherein the driver comprises a variable gain amplifier.
8. The apparatus of claim 1 wherein the selection specifications include drop volume.
9. The apparatus of claim 1 wherein the plurality of curvilinear waveform shapes are stored in a waveform shape library for selection to configure the waveform generator.
10. The apparatus of claim 1 wherein the processor is operable to select the curvilinear waveform shape and configure the waveform generator.
11. The apparatus of claim 1 wherein the curvilinear waveform shape is associated with a Beta distribution.
12. The apparatus of claim 1 wherein the curvilinear waveform shape is a sinusoidal waveform.
13. The apparatus of claim 1 wherein the selected curvilinear waveform shape is damped.
14. The apparatus of claim 1 wherein the selected curvilinear waveform shape is rectified.
15. The apparatus of claim 1 wherein the waveform generator comprises:
a data store for storing digital representations of the plurality of curvilinear waveform shapes; and
a digital-to-analog converter for converting the digital representation of the selected one of the curvilinear waveform shapes into an analog curvilinear waveform shape signal;
wherein the driver amplifies the analog curvilinear waveform shape signal to generate the drive signal.
16. The apparatus of claim 15 wherein the waveform generator further comprises a waveform shape adjuster that controls a pulse duration and waveform shape parameters of the curvilinear waveform shape signal.
17. The apparatus of claim 16 wherein the waveform shape adjuster further controls driver setting of an amplitude of the drive signal.
18. The apparatus of claim 1 wherein the drive signal has a first segment and a second segment.
19. The apparatus of claim 18 wherein the first and second segments have different curvilinear waveform shapes.
20. The apparatus of claim 1 wherein the curvilinear waveform shape is a Lorentzian waveform.
21. The apparatus of claim 1 wherein the curvilinear waveform shape is a Gaussian waveform.
22. The apparatus of claim 1 wherein the curvilinear waveform shape is a logistic waveform.
23. The apparatus of claim 1 wherein the curvilinear waveform shape is a lognormal waveform.
24. The apparatus of claim 1 wherein the curvilinear waveform shape is a Maxwell waveform.
25. The apparatus of claim 1 wherein the curvilinear waveform shape is a Rayleigh waveform.
26. The apparatus of claim 1 wherein the curvilinear waveform shape is associated with a Chi distribution.
27. The apparatus of claim 1 wherein the curvilinear waveform shape is associated with a Chi Squared distribution.
28. The apparatus of claim 1 wherein the curvilinear waveform shape is associated with a Fisher's z distribution.
29. The apparatus of claim 1 wherein the curvilinear waveform shape is associated with a Gamma distribution.
30. The apparatus of claim 1 wherein the curvilinear waveform shape is associated with a Fisher-Tippett distribution.
31. The apparatus of claim 1 wherein the curvilinear waveform shape is associated with a Map-Airy distribution.
32. The apparatus of claim 1 wherein the curvilinear waveform shape is associated with a Normal Ratio distribution.
33. The apparatus of claim 1 wherein the curvilinear waveform shape is associated with a Student's t distribution.
34. The apparatus of claim 1 wherein the curvilinear waveform shape is associated with a Student's z distribution.
35. The apparatus of claim 1 wherein the curvilinear waveform shape is associated with a Uniform Sum distribution.
36. The apparatus of claim 1 wherein the curvilinear waveform shape is associated with a Weibull distribution.
37. The apparatus of claim 1 wherein the selection specifications include drop velocity.
38. The apparatus of claim 1 wherein the selection specifications include amplitude.
39. The apparatus of claim 1 wherein the selection specifications include pulse width.
40. The apparatus of claim 1 wherein the selection specifications include dispenser type.
41. The apparatus of claim 1 wherein the selection specifications include fluid type.