Drive circuit for temperature control heater in ink jet printer
US4590362A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 18, 1984 |
| Grant date | May 20, 1986 |
| Priority date | — |
| Expiry date | Apr 18, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/24
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A circuit for controllably driving a heater in order to speed up temperature elevation at a buildup stage of a liquid which is to be maintained at a predetermined temperature heated by the heater, particularly ink in an ink jet printer. A voltage developed by doubling an output voltage of an atmospheric temperature sensor by an amplifier is compared with a reference voltage, which is adapted to decide power to be supplied to the heater in the event of a buildup of the ink temperature. A temperature-sensitive element responsive to an atmospheric temperature has a temperature coefficient which is double the temperature coefficient of a temperature-sensitive element responsive to a heater temperature. The output voltages of the two elements are weighted by a same amount and then added together, the summation output being compared with the reference voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.