Browse Prior Art Database

MONOLITHIC CONTINUO JET PRINTHEAD

IP.com Disclosure Number: IPCOM000026013D
Original Publication Date: 1989-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 126K

Publishing Venue

Xerox Disclosure Journal

Abstract

Continuous stream type ink jet printheads are commonly composed of several discrete components: (a) drop generator, (b) charge electrode, (c) deflection electrodes, and (d) gutter system. All of these systems need to be accurately aligned in all axes and are expensive to fabricate.

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EROX DISCLOSURE JOURNAL

MONOLITHIC CONTINUOUS INK Proposed Classification JET PRINTHEAD U.S. C1.346/75 Donald J. Drake Int. C1. Gold 15/18 William G. Hawkins
Roger G. Markham

Continuous stream type ink jet printheads are commonly composed of several discrete components: (a) drop generator, (b) charge electrode, (c) deflection electrodes, and (d) gutter system. All of these systems need to be accurately aligned in all axes and are expensive to fabricate.

Figure 1 shows a cross sectional view of a printhead showing a method of monolithically fabricating a continuous binary ink jet printhead 10 that generates drops 12, charges them, and either prints with the drops or deflects them into its gutter 14.

The basic fabrication of the drop enerator 16 has been described in U.S.

thick photosensitive polymer 18 has been added between the channel plate 20 and the heater plate 22. This layer serves to raise the ink stream 24 above the level of the heater plate surface 26 by 1-2 mils.

Patent 4,638,328 on a continuous t

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MONOLITHIC CONTINUOUS INK JET PRINTHEAD (Cont'd)

Beyond the charge/ground electrodes 30 is a gutter 14 fabricated by anisotropic etching a slot 32 into the heater plate. A splatter roof 34 can be made of the same photosensitive polymer that is between the channel and heater plates.

The principle of operation is that charged drops are deflected into the gutter and uncharged drops are undeflected and hit the paper (not shown).

To ballpark the dimensions of the printhead, assume the distance t from the charge electrode to the ink stream is 40ym, the diameter d of the ink stream is 25p, the drop wavelength h is 150ym. Using the formula for drop charging for U-shaped...