Compensating driver circuit for thermal print head
US4305080A · kind A · utility
13Cited by
8References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 18, 1979 |
| Grant date | Dec 8, 1981 |
| Priority date | — |
| Expiry date | Jul 18, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/365
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A driver circuit for a thermal printing element varies the power applied to the element, depending upon its recent history of energization, in order to maintain uniform print density desprite temperature variation in the element. A capacitor charges and discharges to measure time intervals since the last element energization to control the voltage applied by an output transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.