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Ink jet print head with balanced energy supply

An inkjet print head and print head technology, applied in printing and other directions, can solve the problems of shortening resistance life, bubble nucleation and ink drop inconsistency, and difficulty in reducing the width of the film underlying structure of the print head.

Inactive Publication Date: 2006-01-18
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessive energy has various negative effects including shortened resistor life; "kogation", which refers to the accumulation of ink components adhering to the passivation layer in the ink chamber; and reduced printhead reliability
Also, application of different energies across different resistors results in inconsistent bubble nucleation and droplet formation
[0008] While varying the trace width is a known energy balancing technique, the use of this technique makes it difficult to reduce the width of the printhead's thin-film understructure

Method used

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  • Ink jet print head with balanced energy supply
  • Ink jet print head with balanced energy supply
  • Ink jet print head with balanced energy supply

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Embodiment Construction

[0023] In the following detailed description and drawings, the same elements are designated by the same reference numerals.

[0024] see now figure 1 and 2, there is schematically shown a schematic perspective view, not to scale, of an ink jet print head employed in the present invention, the ink jet print head generally comprising (a) a film substructure or die 11, the lower layer The structure includes a substrate, such as silicon, on which the various thin film layers are formed, (b) an ink barrier layer 12 disposed on the thin film substructure 11, and (c) an orifice or nozzle plate 13, which It is laminated on top of the ink barrier layer 12 .

[0025] Thin film substructure 11 is formed in accordance with conventional integrated circuit techniques and includes thin film heater resistors 56 formed therein. The ink barrier layer 12 is formed from a dry film that is laminated to the film substructure 11 under the action of heat and pressure and photoset to form ink chamb...

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PUM

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Abstract

An ink jet printhead (11, 12, 13) having FET drive circuits (85) that are configured to compensate for power trace (86, 181) parasitic resistances. The FEt drive circuits have drain regions of selected length in order to set an on-resistance of the FET drive circuits. In another embodiment the size of the FET circuits is selected.

Description

technical field [0001] The present invention relates generally to inkjet printing, and more particularly to a thin film inkjet printhead having a FET (field effect transistor circuit) drive circuit or FET circuit configured to compensate for parasitic power dissipation along a ground bus. Background technique [0002] Inkjet printing technology is well developed. Commercial products such as computer printers, plotters, and facsimile machines have all employed inkjet technology to produce print media. For example, in Hewlett-Packard Journal Volume 36, Issue 5 (May 1985), Volume 39, Issue 5 (October 1988), Volume 43, Issue 4 (August 1992), Volume 43, Issue 6 (December 1992) ) and various articles in Vol. 45, No. 1 (February 1994), which describe the contributions of Hewlett-Packard Company to inkjet technology, which are hereby incorporated by reference in their entirety. [0003] In general, inkjet images are formed based on the precise positioning of ink droplets on a p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41J2/14B41J2/16B41J2/05B41J2/155
CPCB41J2/155B41J2/14072B41J2/16
Inventor J·M·托尔格尔森D·M·胡尔斯特
Owner HEWLETT PACKARD DEV CO LP