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FABRICATION SCHEME FOR TYPE I CHARGE ELECTRODES

IP.com Disclosure Number: IPCOM000024910D
Original Publication Date: 1982-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 112K

Publishing Venue

Xerox Disclosure Journal

Abstract

In the ink jet printing art, one type is accomplished by forcin breaks up into individual dioDlets at well defined locations in relation to those one or more nozzles. ink to screte At the poih of droplet formation or breakoff from the ink jet, a charge is induced on the ink droplets so that the subsequent trajectory of those droplets can be manipulated. The typical manipulation technique is to cause the charge droplets to pass through a static electric field which deflects the ink droplets in accordance with a pattern depending upon the charge introduced at the droplet breakoff point. When multiple ink jets are simultaneously generated, a multitude of charging tunnels or electrodes must be precisely positioned in relation to those jets and furthermore those tunnels must be coupled to control electronics for causing each individual droplet to carry a unique charge. The charge electrode alignment must be maintained at elevated temperatures in spite of thermal expansion in the materials which mount the electrode. Those materials must also be compatible with the ink used in the printing system. A need exists for cost-effective and easily-manufacturable process for mounting charged tunnels in relation to ink jet nozzle arrays which satisfy the above criteria.

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KEROX DISCLOSURE JOURNAL

FABRICATION SCHEME FOR TYPE I CHARGE ELECTRODES
Daniel R. Blessington
Kenneth E. Wood

Proposed Classification
U.S. C1. 346/75

Int. C1. Gold 15/8

            .. f printin type one art, printing jet ink the In squirt from one or more nozzles so that the in is accomplished by forcin breaks up into individual dioDlets at well defined locations in relation to those one or more nozzles.

                                                   ink to screte At the poih of droplet formation or breakoff from the ink jet, a charge is induced on the ink droplets so that the subsequent trajectory of those droplets can be manipulated. The typical manipulation technique is to cause the charge droplets to pass through a static electric field which deflects the ink droplets in accordance with a pattern depending upon the charge introduced at the droplet breakoff point. When multiple ink jets are simultaneously generated, a multitude of charging tunnels or electrodes must be precisely positioned in relation to those jets and furthermore those tunnels must be coupled to control electronics for causing each individual droplet to carry a unique charge. The charge electrode alignment must be maintained at elevated temperatures in spite of thermal expansion in the materials which mount the electrode. Those materials must also be compatible with the ink used in the printing system. A need exists for cost-effective and easily-manufacturable process for mounting charged tunnels in relation to ink jet nozzle arrays which satisfy the above criteria.

The present proposal relates to a unique charge electro-fabrication process that yields electrodes which meet the above criteria. Diallyl phthalate (DAP) polymer resin is chosen as a substrate material. It is ink compatible and can be molded into an appropriate shape for use as a charge tunnel substrate. The material has the same coefficient of thermal expansion as the metals considered for aperture plates and acoustic bodies for generating ink streams. The diallyl phthalate material has been successfully used to precision mold a charge tunnel array using the following steps. As a first step, the material is precision fabricated by precision polymer processing. The substrate...