Ink-jet printing apparatus having printed head driven by ink viscosity dependent drive pulse
US6109716A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 9, 1998 |
| Grant date | Aug 29, 2000 |
| Priority date | — |
| Expiry date | Mar 9, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2202/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In an ink-jet printing apparatus, a first drive pulse is applied to a printing head and then a second drive pulse is applied to the printing head. The second drive pulse has a magnitude equal to that of the first drive pulse and a pulse width equal to approximately 1.6 to 1.8 times the one-way propagation time T of pressure wave in an ink channel so that a center of the second drive pulse is provided in a range of approximately 2.25 to 2.75 times the one-way propagation time T from an end time of the first drive pulse. Voltages of the drive pulses to the printing head are regulated according to variation in the viscosity of ink to be ejected. The viscosity of ink is represented by the ambient temperature around the printing head. This arrangement makes it possible to ensure adequacy in volume of ink per droplet and stability in ink droplet ejection rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.