Heating resistor, method for reducing current concentrated phenomenon and method for producing printing head

A technology for heating resistors and resistors, which is applied in printing and other directions, can solve the problems of local temperature rise of current density, shortening the life of electronic circuits, and increasing current density, so as to improve failure, reduce current intensive phenomenon, and resistance value increased effect

Inactive Publication Date: 2004-12-15
HEWLETT PACKARD DEV CO LP
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  • Application Information

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Problems solved by technology

However, increasing the resistance value increases the current density even though the total current decreases
High current densities increase local temperatures and generate strong electric fields that electromigrate materials, shortening the life of electronic circuits
Additionally, in applications where current is frequently switched on and off, such as in thermal inkjet heating resistors, excessive thermal cycling produces thermal expansion and contraction that can fail due to fatigue

Method used

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  • Heating resistor, method for reducing current concentrated phenomenon and method for producing printing head
  • Heating resistor, method for reducing current concentrated phenomenon and method for producing printing head
  • Heating resistor, method for reducing current concentrated phenomenon and method for producing printing head

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Embodiment Construction

[0030] There are three main ways to increase the resistance of heating resistors used in thermal inkjet printers. The first method is to deposit a thinner resistive layer on the substrate oxide layer. The disadvantage of this method is that the surface of the film becomes easily damaged as its thickness decreases, and the thinner the film, the more difficult it is to control its thickness. The second approach is to use a different material with a higher intrinsic resistivity than the known tantalum-aluminum film. Due to the extreme environmental conditions that heating resistors are subjected to, coupled with the need for low-cost, low-defect thin-film processes, this approach is unlikely to be adopted in the short term. A third approach is to geometrically reconfigure the thin film resistor, which increases the resistance of the heating resistor. The present invention proposes according to the third method.

[0031] Figure 1A The perspective view of FIG. 2 shows one examp...

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Abstract

In order to overcome inefficient power dissipation in parasitic resistances and to provide economies in the power supply, a higher resistance value heater resistor is employed in a thermal inkjet printhead. Higher current densities in a high resistance segmented heater resistor are reduced by employing a shorting bar divided by a current balancing resistor.

Description

technical field [0001] This invention relates generally to ink jet printers and, more particularly, to an ink jet printhead drop generator utilizing a high resistance heating resistor configured to reduce current crowding. Background technique [0002] Inkjet printing technology has been fully developed, and many industrial products such as computer printers, plotters, copiers and fax machines have successfully adopted inkjet technology to produce hard copy printouts. The fundamentals of inkjet technology have been published, for example, in various articles in the following issues of the Hewlett-Packard Company Magazine: Volume 36, Number 5, May 1985; Volume 39, Number 4, August 1988; 1988 Volume 39, No. 5, October 1992; Volume 43, No. 4, August 1992; Volume 43, No. 6, December 1992; and Volume 45, No. 1, February 1994. W.J.Lloyd and H.T.Taub also introduced inkjet printers in the book "Output Printing Proofer" (edited by R.C.Durbeck and S.Sherr, published by San Diego Aca...

Claims

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Application Information

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IPC IPC(8): B41J2/14
CPCB41J2002/14177B41J2/1412B41J2/14129Y10T29/49128Y10T29/49083
InventorM·吉雷N·C·拉萨S·普拉卡斯
OwnerHEWLETT PACKARD DEV CO LP