Pulse width modulation method for a parallel input print head
US5739838A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1995 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Apr 20, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2215/0077
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An apparatus and method for generating all of the print levels represented by an image data signal using a parallel input print head which has an input data bus which is narrower than the image data signal involves processing and printing image data multiple times. Each time the image data is processed, it is reduced from its original width down to the width which the print head can accept. The process includes the steps of determining the minimum number of times L.sub.min that the print head must be loaded to accomplish printing using the full width of the image data signal; processing the image data L times, where L.gtoreq.L.sub.min, to produce L output signals that (1) are no wider than the width of the input data bus and (2) have values such that the sum of the values of the L output signals equals the value of the input data signal; and using the L output signals to drive the print head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.