Ink jet printing apparatus
US4228440A · kind A · utility
45Cited by
6References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1978 |
| Grant date | Oct 14, 1980 |
| Priority date | — |
| Expiry date | Dec 18, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/025
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Ink is fed to an ink jet printing head (12) from which it is ejected into a sheet of printing paper (19). A plurality of capacitive ultrasonic vibrators (29), (31) are provided inside the printing head (12) to atomize ink therein prior to ejection. The ultrasonic vibrators (29), (31) are connected in parallel with each other and also to an inductor (48) to constitute a resonant circuit. An electrical drive signal is applied to the resonant circuit, the frequency of the drive signal being equal to the resonant frequency of the resonant circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.