Method for making an image by direct thermal imaging
US5734411A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 1994 |
| Grant date | Mar 31, 1998 |
| Priority date | — |
| Expiry date | Nov 8, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/4989
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for making an image by means of a direct thermal imaging element, comprising on a support a thermosensitive layer incorporating an organic silver salt and a reducing agent contained in said thermosensitive layer and/or in other optional layers. The imaging element is imagewise heated by means of a thermal head having energizable heating elements. The activation of the heating elements is executed duty cycled pulsewise with the steps of preheating each heating element for a preheating time such that a preheat temperature in the imaging element is reached, which is just below the conversion temperature; selecting a pulse duty cycle such that a maximal density on the imaging element will be reached at the end of the maximal writing time; retrieving from a memory for each individual pixel an individual writing time related to a desired density on the imaging element; and energizing the heating elements with the selected pulse duty cycle for a time related to the retrieved individual writing time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.