Acoustic ink printhead having reflection coating for improved ink drop ejection control
US4959674A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 1989 |
| Grant date | Sep 25, 1990 |
| Priority date | — |
| Expiry date | Oct 3, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2002/14322
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An acoustic ink printhead having improved ink drop ejection control includes a substrate having an array of acoustic lenses at its upper surface for bringing rf acoustic waves to a predetermined focus and a layer of acoustically reflective material of a thickness equal to an odd multiple of one quarter of the wavelength of the acoustic rf waves passing through it having openings corresponding to and positioned above each lens. Ink from an ink pool is allowed to couple acoustically to the lenses at each opening for receiving the focussed acoustic rf wave, while the layer acoustically isolates the interstitial regions between each lens by reflecting the acoustic rf waves incident on the upper surface of the substrate in those regions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.