Method for testing ink-jet recording heads
US5621524A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 10, 1996 |
| Grant date | Apr 15, 1997 |
| Priority date | — |
| Expiry date | Apr 10, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/1646
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In an ink jet recording device having a print head wherein an expanding bubble formed in ink ejects an ink droplet from an orifice, a method for testing wafers on which a large number of print heads are formed is provided wherein the head is filled with pure water, water droplets of the pure water is ejected by application of a start signal to the print head, ejected water droplets is irradiated with condensed light, and the condensed light scattered by the ejected water droplets is detected. The time at which the scattered light was detected is correlated with time of the start signal, and it is determined whether the head is good or not according to the correlation of the time at which the scattered light was detected and the time of the start signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.