Printing pulse control circuit for thermal printing head
US4415907A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 5, 1981 |
| Grant date | Nov 15, 1983 |
| Priority date | — |
| Expiry date | Nov 5, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40031
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a thermal printing head for use in a facsimile printer or the like, unevenness of printing consistency occurs which is due to temperature variation of the thermal resistor elements and due to the difference in printing data resulting from black record information or white record information of the printing data for the preceding line. A printing pulse control circuit for the thermal printing head stores the information for the preceding line, and applies a printing pulse of smaller pulse width to the thermal resistor elements heated by the black record information for the preceding line and a printing pulse of larger pulse width to the thermal resistor elements not heated with white record information for the preceding line to make uniform black printing consistency for the present line irrespective of the type of printing data for the preceding line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.