Ink jet printer thermal control system

Details Ink jet printer thermal control system Ink jet printer thermal control system

1989-01-10

1990-03-20

Hartary, Joseph W.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346140R, G01D 1516, B41J 304

Patent

active

049105280

ABSTRACT:
The temperature of the ejector (12) of a thermal ink jet print head (10) is maintained within acceptable operating limits by measuring the current temperature, predicting the heat loading on a subsequent pass over a printing medium (32), and adjusting the temperature of the ejector (12), as necessary, by heating the ejector (12) or modifying the operation of the printer (60) to permit cooling of the ejector (12). The temperature of the ejector (12) is preferably measured by a thin film temperature measurement resistor (94) codeposited onto a substrate (14) with the thin film ejection resistors (22) that generate the droplets ejected from the ejector (12). Heating of the ejector (12) is preferably accomplished by passing a low level current through the ejection resistors (22). Cooling is preferably accomplished without the use of a fan by delaying the printing pass, or reducing the heat load during the printing pass by slowing the printing rate during that pass only.

REFERENCES:
patent: 4345262 (1982-08-01), Shirato
patent: 4567488 (1986-01-01), Moriguchi
patent: 4704620 (1987-11-01), Ichihashi
patent: 4719472 (1988-01-01), Arakawa
patent: 4791435 (1988-12-01), Smith

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