Method of identifying defective nozzles in an inkjet printhead
US8807684B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 2013 |
| Grant date | Aug 19, 2014 |
| Priority date | — |
| Expiry date | Sep 6, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2029/3935
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method of identifying defective nozzles of a printhead. The method includes the steps of: (i) instructing each nozzle in one ink plane of the printhead to print a respective coded line pattern, each coded line pattern being represented by a column of printed pixels and absent pixels, the coded line patterns being defined by first and second coding schemes encoding a position of each nozzle within its respective cell and a position of each cell within its respective ink plane; (ii) firing each nozzle of the ink plane to print a test pattern comprising a plurality of neighboring coded line patterns; (iii) imaging an area of the test pattern to obtain an imaged test pattern; (iv) decoding the imaged test pattern using the first and second coding schemes; and (iv) identifying the defective nozzles using the decoded imaged test pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.