L.E.D. array printer with extra driver channel
US5253934A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1990 |
| Grant date | Oct 19, 1993 |
| Priority date | — |
| Expiry date | Jun 26, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2202/17
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A non-impact printer apparatus is described that includes a recording head having a plurality of recording elements such as LED's for recording on a recording medium. A plurality of driver chips are provided on the head and each includes a plurality of current driving channels for selectively driving a plurality of recording elements in accordance with respective image data signals. The driver chips each further include an extra current driving channel not associated with a recording element for generating a current related to that sent to said recording elements. Monitoring of the current in the extra channel is provided to permit for changes of current to the recording elements and/or corrected image data to provide fine tuned control over uniformity of the recording elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.