Inkjet head inspection device
US7237865B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 22, 2005 |
| Grant date | Jul 3, 2007 |
| Priority date | — |
| Expiry date | Dec 26, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/04581
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An inkjet head inspection device inspects an inkjet head including plural nozzles that eject ink droplets, plural ink reservoirs that contain the ink to be ejected from the plural nozzles, and plural piezoelectric elements that exert pressure on the ink reservoirs to force the ink droplets out of the nozzles. The inkjet head inspection device has a differential amplifier section that amplifies a differential voltage between respective ground-side electrodes or opposite-side electrodes of the piezoelectric elements corresponding to two nozzles to be inspected, when a drive voltage application section applies a drive voltage to each of the piezoelectric elements, and a decision section that decides whether an ink jet malfunction occurs in the two nozzles to be inspected, based on the differential voltage furnished from the differential amplifier section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.