Browse Prior Art Database

METHOD FOR PROHIBITING FRONT FACE CHANNEL COATING INTRUSION USING A TEMPORARY FILLER MATERIAL

IP.com Disclosure Number: IPCOM000027509D
Original Publication Date: 1997-Jun-30
Included in the Prior Art Database: 2004-Apr-08
Document File: 2 page(s) / 123K

Publishing Venue

Xerox Disclosure Journal

Abstract

Proposed is a method for prohibiting a hydrophobic front face coating from depositing within the channels of Thermal Ink Jet (TIJ) devices and for providing mechanical stability to the channels during handling and packaging operations by temporarily filling them. The filler material is afterwards removed to allow for drop ejection. Lack of front face coating within the channels improves priming, refa, and frequency response of the device. By mechanically supporting the channels during handling and packaging, chips of silicon are not broken free from the channels. This reduces the number of plugged or exploding jets and misdirectionality errors.

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XEROX DISCLOSURE JOURNAL

Proposed Classification
U. S. C1. 347/022 Int. C1. B41j 02/165

Proposed is a method for prohibiting a hydrophobic front face coating from depositing within the channels of Thermal Ink Jet (TIJ) devices and for providing mechanical stability to the channels during handling and packaging operations by temporarily filling them. The filler material is afterwards removed to allow for drop ejection. Lack of front face coating within the channels improves priming, refa, and frequency response of the device. By mechanically supporting the channels during handling and packaging, chips of silicon are not broken free from the channels. This reduces the number of plugged or exploding jets and misdirectionality errors.

TIJ devices require application of a hydrophobic front face coating to minimize face wetting and improve print quality. The front face coating can be applied by a variety of methods, such as spray or dip coating, intermediate transfer, or plasma deposition. An issue with front face coating, however, is minimizing deposition of the hydrophobic material in the channels and even preventing plugs in the channels. Wet coating methods (ie-, spray, dip, and transfer) typically utilize a positive flow of air or an inert gas through the channels during front face coating to displace the hydrophobic material. This is inconvenient and limits throughput. Many of the films also suffer poor adhesion and/or uniformity around the nozzles due to this flow. The mainline approach to front face coating is plasma deposition of a fluorinated diamond like carbon film. Minimization of coating within the channels can be accomplished through judicious choice of the deposition parameters, but some hydrophobic material is still deposited within the channels. This channel deposition is believed to result in difficult priming, poor refill, and exploding jets.

It is proposed to fa the channels of the TIJ device prior to front face coating while still at the bonded heater waferkhannel wafer stage pair just prior to dicing. A possible faer material is an eicosane wax. This wax is not water soluble and therefore usable during the dicing operation. The wax melts at about 40°C above the temperature of the front face

XEROX DISCLOSURE JOURNAL - Vol. 22. No. 3 May/June 1...