Xerox Corporation

Raymond E Bailey

Robert P Altavela

Joan R Ewing

Thomas E Orlowski

Joseph C Mammino

Joseph A Swift

James McConnell Duff

William G Herbert

Donald J Drake

John W Spiewak

William G Hawkins

Stephen F Pond

Donald S Sypula

Robert Arnold Gross

Michael Robert Campanelli

Joseph Herman Lang

Donald G DuPree

Manfred H Goeserich

Pamela J Hartman

Robert K McCubbin

Edwin M Wallin

Chester H Ling

A process for preparing a toner donor roll having an integral electrode pattern involving: (a) providing a cylindrically shaped insulating member; (b) coating the insulating member with a photo or thermally sensitive composition comprised of a polymeric material and a conductive metal nucleating agent; (c) patterning the composition, resulting in a first composition portion corresponding to the electrode pattern and a second composition portion; and (d) depositing conductive metal on the first composition portion, resulting in the electrode pattern which is capable of being electrically biased to detach toner particles from the donor roll. In an alternative embodiment, there is provided an insulating member comprised of an insulating polymeric material and a conductive metal nucleating agent.

Process for preparing electroded donor rolls

A heat sink for a thermal ink jet printhead has improved resistance to the corrosive effects of ink by forming a chromate film on a copper plated metal substrate. In one described embodiment, a thermal ink jet printer is formed by bonding together a channel plate and a heater plate. Resistors and electrical connections are formed in the surface of the heater plate. The heater plate is bonded to a heat sink comprising a zinc substrate having a copper film plated on one surface. The copper plated heat sink is immersed in a chromic acid and water bath. Metal anodes are placed within the bath and a field is applied for a period of time sufficient to form a polymeric chromate film on the copper plated surface. The chromate film has improved resistance to ink corrosion and exhibits a stronger printhead to heat sink bonding strength.

Thermal ink jet printhead with ink resistant heat sink coating

A corona generating device of the type in which a control screen adjacent a corona generating electrode regulates the charge flow. The control screen is coated with a substantially continuous layer of boron electroless nickel.

Corona generating device

A method of forming at least one electrically conductive path in a plastic substrate comprising providing a thermoplastic substrate having a melting point below 325.degree. C., coating said substrate with a precursor of a catalyst for the electroless deposition of conductive metals, said catalyst precursor having a decomposition temperature below the melting point of said thermoplastic and within the temperature range where said thermoplastic softens, heating the portion of said coated thermoplastic substrate corresponding to said conductive path to a temperature sufficient to decompose said catalyst precursor to said catalyst and soften said thermoplastic; said substrate, catalyst precursor and temperature being selected such that on heating to the temperature the precursor decomposes to the catalyst, the thermoplastic softens and at least partially melts without substantial decomposition to enable the catalyst to penetrate the surface of the thermoplastic and become anchored thereto to provide nucleation sites for the subsequent electroless deposition of conductive metal and depositing conductive metal by electroless deposition on said heated portion to form said conductive path.

Process for catalysis of electroless metal plating on plastic

A thermal ink jet printhead of the type which expels droplets on demand towards a recording medium from nozzles located above and generally parallel with the bubble generating heating elements contained therein is disclosed, together with fabrication processes therefor. The droplets are propelled along trajectories that are perpendicular to the heating element surfaces and from nozzles located in the printhead roof; such configuration is generally referred to as 'roofshooter'. Each printhead comprises a silicon heater plate and a fluid directing structural member. The heater plate has a linear array of heating elements associated addressing electrodes, and an elongated ink fill hole parallel with the heating element array. The structural member contains at least one recessed cavity, a plurality of nozzles, and a plurality of parallel walls within the recessed cavity which define individual ink channels for directing ink to the nozzles. The recessed cavity and fill hole are in communication with each other and form the ink reservoir within the printhead. The ink holding capacity of the fill hole is larger than that of the recessed cavity. The fill hole is precisely formed and positioned within the heater plate by anisotropic etching. The structural member may be fabricated either from two layers of photoresist, a two-stage flat nickel electroform, or a single photoresist layer and a single stage flat nickel electroform.

Thermal ink jet printhead fabricating process

A corona generating device for depositing negative charge on an imaging surface carried on conductive substrate comprises at least one elongated conductive corona discharge electrode, means to connect the electrode to a corona generating potential source, at least one element adjacent the corona discharge electrode capable of adsorbing nitrogen oxide species generated once the corona generating electrode is energized and capable of desorbing nitrogen oxide species once that electrode is not energized, the element being plated with a substantially continuous thin layer of lead to neutralize the nitrogen oxide species when generated. In a preferred embodiment the corona discharge electrode comprises a thin wire coated at least in a discharge area with a dielectric material and the at least one element comprises a conductive shield and an insulating housing having two sides adjacent the shield to define the longitudinal opening to permit ions emitted from the electrode to be directed toward a surface to be charged, both the shield and the two sides of the housing being plated with a substantially continuous thin layer of lead.

A process for nickel plating a cylindrically shaped hollow core mandrel suitable for chromium plating for use in an electroforming process for the production of endless seamless nickel xerographic belts, is disclosed. The process comprises providing a hollow core aluminum or aluminum alloy cylindrically shaped member and (1) anodizing this core member by using this core member as an anode in an anodizing bath where the cathode comprises lead or lead alloys and (2) nickel plating this anodized core member in a nickel electroforming bath where the core member becomes the cathode and the anode is nickel or nickel alloy. Additionally and optionally, this core member may then be (3) subjected to an acid dip bath where the core member remains for a particular length of time and, additionally, then the core member is (4) plated with chromium by placing the core member in a chromium electroplating bath with a metal anode of lead or lead alloys.

Method of forming an electroforming mandrel

A cylindrically shaped hollow mandrel is disclosed which is suitable in an electroforming process used for the production of an endless seamless nickel xerographic belt. The mandrel set forth comprises a metal core member with a thin removable metal sleeve having a thickness between about 10 and 60 mils which is fitted over said core member to provide a surface for electroforming of the nickel belt. Mandrels disclosed in the present invention have the advantage of a longer lifetime of use in a continuous electroforming process because of the replaceable nature of the metal sleeve.

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Webster, NY, United States of America

Raymond E Bailey