Control system for ink jet printing element
US4498089A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 15, 1983 |
| Grant date | Feb 5, 1985 |
| Priority date | — |
| Expiry date | Jul 15, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/04581
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The control system is applied to an ink jet head in which the individual drops of ink are expelled from a container by way of a nozzle by the effect of contractions of a piezoelectric transducer applied to the container. The transducer is included in an oscillatory circuit which is normally connected to a dc voltage source. A pulse generator acts on a switch to generate a voltage wave in the oscillatory circuit of the transducer and interrupts the pulse when the current in the oscillatory circuit goes to zero, whereby a single voltage wave with a low harmonics content is generated. The oscillatory circuit is so designed that the frequency spectrum created by the voltage wave drops rapidly with frequencies higher than the resonance frequency of the oscillatory circuit and has at least one node close to the resonance frequency at the lowest nodal diameter mode of vibration of the meniscus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.