Method for increasing thermal print quality
US6798433B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 2003 |
| Grant date | Sep 28, 2004 |
| Priority date | — |
| Expiry date | Sep 18, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/36
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A printing method for printing a pixel at a gray level x on paper by a printer. The printer includes a thermal print head, which includes a heater for heating a ribbon to print pixels from gray levels 1 to m−1 on the paper, and the ribbon. The method includes: if x is not greater than a value n, heating the ribbon x times and evenly distributing the heating initiation times of the x times between the time point 0 and the time point (m*(x−1)/n) for printing the pixel at gray level x on the paper. If x is greater than the value n, heating the ribbon x times and evenly distributing the heating initiation time of the n times between the time point 0 and the time point (m*(n−1)/n) and distributing the heating initiation times of the x−n times after the heating initiation time points of the n times.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.