Thermal print head termperature control
US5025267A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1988 |
| Grant date | Jun 18, 1991 |
| Priority date | — |
| Expiry date | Sep 23, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D15/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An apparatus and method is disclosed for controlling the temperature of a thermal print head and individual dot elements thereon, thereby optimizing print quality and reducing the thermal and electrical stress on the thermal print head. Hysteresis control determines the amount of energy supplied to each dot element in the thermal print head. Peak temperature control determines the width of the pulses supplied to the dot elements on the thermal print head. Pre-heating control raises the temperature of each dot element when the dot element has been idle for a predetermined period. Substrate temperature control maintains the temperature of said thermal print head at a predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.