Thermal printing method and apparatus
US4568817A · kind A · utility
27Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1984 |
| Grant date | Feb 4, 1986 |
| Priority date | — |
| Expiry date | Jun 26, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/38
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In a thermal printing utilizing a heat sensitive printing paper or an ink donor film, sticking of a heat sensitive color developing layer on the printing paper or a substrate film of the ink donor film to a thermal head is prevented by supplying a predetermined amount of electric energy to heat generating elements of the thermal head during time intervals between successive printing heat generations in the heat generating elements. For this purpose, warming pulses generated from a warming pulse generating circuit are applied during the time intervals to the heat generating elements for warming the same.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.