Method and apparatus for controlling the uniformity of print density of a thermal print head array
US7545401B2 · kind B2 · utility
0Cited by
19References
11Claims
0Family size
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Key dates
| Filing date | Oct 4, 2007 |
| Grant date | Jun 9, 2009 |
| Priority date | — |
| Expiry date | Dec 10, 2027 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/36
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for controlling the print density of individual heating elements of a thermal print head array determines respective energy values for each heating element in response to image pixel data to be printed, multiplies determined energy values by a respective predetermined correction factor for one or more respective heating elements for improving print density consistency between individual heating elements, and dithers adjusted energy values from the step of multiplying as a function of adjacent image pixels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.