Thermal printout density control
US4928117A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 14, 1988 |
| Grant date | May 22, 1990 |
| Priority date | — |
| Expiry date | Oct 14, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D15/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Data records provided by thermal recording heads, including a plurality of clocked heating elements, are controlled in density by continually storing for each of such heating elements a present moment recording datum and further recording data including a one-clock-interval-old recording datum and a two-clock-interval-old recording datum for the particular heating element, and by continually generating for each heating element from the present moment recording datum to be recorded a first dot recording energization quantum and for each of the further dot recording data having been printed a dot recording energization pause and for each blank value of such further dot recording data a further dot recording energization quantum. This advantageously includes an insertion, for each one-clock-interval-old recording datum having been printed by the particular heating element, of an energization pause between a dot recording energization quantum corresponding to a blank value of the immediately preceding two-clock-interval-old recording datum and the then present moment dot recording energization datum. The heating elements are sequentially energized with dot recording quanta thus generat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.