Ink temperature control apparatus for ink jet printing apparatus
US4459469A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 3, 1982 |
| Grant date | Jul 10, 1984 |
| Priority date | — |
| Expiry date | May 3, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/24
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A liquid temperature control apparatus for an ink jet printer has a first ink temperature sensor located adjacent but at a spacing from an ink ejection head and a second ink temperature sensor mounted on a heater. The two sensors have an identical temperature coefficient. A voltage supply to the heater is controlled in accordance with a difference between a reference voltage and a sum voltage of outputs of the two sensors. The voltage supply to the heater is further controlled on the basis of an apparent reference voltage, which is a difference between an output voltage of the first sensor and a reference voltage which provides a predetermined temperature, and an output voltage of the second sensor. The two sensors are located before and after the heater. The differential voltage is coupled to the heater after being power-amplified by a power element for output. The power element is mounted on a support member for supporting a filter which is positioned immediately ahead of the first sensor. First and second temperature sensors are positioned before and after a first heater to sense temperatures of an ink before and after heated by the first heater, respectively. The ink temperatur…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.