Ink jet printhead thermal working conditions stabilization metho

Details Ink jet printhead thermal working conditions stabilization metho Ink jet printhead thermal working conditions stabilization metho

Filed on

1996-06-20

Date issued

1998-06-16

Examiner

Burr, Edgar S.

Patent Class

Incremental printing of symbolic information

SubClass

Ink jet

SubSubClass

Controller

Other Related Categories

347 14, B41J 2938

Type

Patent

Status

active

Patent number

057678723

Description

ABSTRACT:
An ink jet printhead comprising a plurality of ejection resistors and at least one additional resistor, integrated on the same semiconductor substrate; the additional resistor is constituted by a material with a positive coefficient of variation of resistance with temperature of between 0.3 and 1.0%/.degree.C. and is used both for heating of the substrate and for measuring its temperature. Various circuits based on using the additional resistor are defined for implementing a method for stabilizing temperature of the substrate; also defined are a method for obtaining a stabilization temperature that remains constant with variation of the characteristics of the head and a method for setting the energetic operating point of the ejection resistors.

REFERENCES:
patent: 4567353 (1986-01-01), Aiba
patent: 5208611 (1993-05-01), Kappel et al.

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