Surface ripple wave suppression by anti-reflection in apertured free ink surface level controllers for acoustic ink printers
US5450107A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 27, 1991 |
| Grant date | Sep 12, 1995 |
| Priority date | — |
| Expiry date | Dec 27, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2002/14475
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In response to the foregoing need, the cap structures that are provided by this invention for controlling the free ink surface levels of acoustic ink printers are characterized by having aperture configurations that are more or less equally subdivided into "reflectively balanced" sectors that radially differ from each other by 1/4 of the dominant wavelength of the surface ripple waves that are generated by the droplet ejection process. The 1/4 wavelength difference in the radii of the two generally equal reflectively balanced fractional parts of these apertures causes the dominant frequency components of the retroreflected ripple waves to destructively interfere with each other in the critical central regions of the apertures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.