Inkjet printhead alignment via measurement and entry
US5847722A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1995 |
| Grant date | Dec 8, 1998 |
| Priority date | — |
| Expiry date | Nov 21, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2202/17
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Optical measurement is made for each nozzle position of a printhead relative to each printhead of an inkjet printing device. Alternatively, the measurement is made for each nozzle relative to a reference point. The reference point, for example, is a datum projection or indentation (i) on the printhead, (ii) integral to the pen body, or (iii) on the pen carriage. The measurement data subsequently is stored for later access. Alternative storage schemes include local storage in electronic memory associated with the pen and physical storage via bar code, magnetic stripes or physical markings. The stored alignment data thereafter is retrieved and input to printhead nozzle management software to adjust the timing for firing respective nozzles. The timing is adjusted to compensate for misalignment and achieve accurate dot placement on a media sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.