DONALD JOHN DRAKE
Pilots at French Rd, Rochester, NY

4638328, Jan 20, 1987

May 1, 1986

6/858143

Donald J. Drake - Rochester NY
William G. Hawkins - Webster NY
Roger G. Markham - Webster NY
Richard V. LaDonna - Fairport NY

Xerox Corporation - Stamford CT

G01D 1518

346 75

A continuous stream type ink jet printhead utilizing constant thermal pulses to perturbate the ink streams emitted through a plurality of nozzles to break up the ink streams into droplets at a fixed distance from the nozzles whereat the drops are individually charged by a charging electrode in accordance with digitized data signals. Each printhead has a manifold, a plurality of ink channels communicating at one end with the manifold and terminating at the other end with nozzles, and at least one resistor addressed by a predetermined frequency of current pulses for applying thermal pulses to the ink. In one embodiment, a resistor is positioned in each of the channels adjacent the nozzles and in another embodiment, a single resistor is located in the ink manifold. The resistors are pulsed at low power to generate a perturbation of ink properties such as density, viscosity, or surface tension without producing a phase change in the ink.

5751311, May 12, 1998

Mar 29, 1996

8/624274

Donald J. Drake - Rochester NY

Xerox Corporation - Stamford CT

B41J 221

347 43

An ink jet printer is configured in a hybrid architecture wherein a full width printbar is combined with a partial width color scanning assembly to provide the capability of selectively printing in black only or, alternately, into producing color prints by operating the color scanning assembly exclusively. The cost of the hybrid system, when compared to a full width color system using four full width printbars, is greatly reduced. The partial width scanning assembly is mounted on a carriage which is stepped along a printing swath width, the sum of the incremental scan steps equaling the width of a full width printbar. A dimensional mismatch between the printbar and the scanning printhead in the direction perpendicular to paper motion (width direction) could result in image degradation because of misalignment of color drops to black drops. The mismatch could result in manufacturing errors in either the printhead width and/or the width of the carriage. It is proposed to identify the total mismatch as a distance. DELTA.

5450108, Sep 12, 1995

Sep 27, 1993

8/126962

Donald J. Drake - Rochester NY
Diane Atkinson - Webster NY

Xerox Corporation - Stamford CT

B41J 234

347 65

An improved thermal ink jet printhead is formed by the alignment and bonding of an anisotropically etched silicon wafer channel plate, containing a plurality of channel grooves, to a silicon wafer heater plate, containing a plurality of heating and addressing elements which are covered by a patterned thin and thick film insulating layer. The printhead enables better bonding of the two plates by sequentially patterning each layer of a two layer thick film layer to compensate for topographical features formed in the last thick film layer. The relative thickness and geometrical shapes of the recesses in the two layers are selected, so that topographic formations are varied to prevent standoff between bonded heater and channel plates, thereby insuring that the adhesive applied between the bonded plates will have the greatest propensity to bond.

5034083, Jul 23, 1991

Oct 16, 1989

7/422220

Michael R. Campanelli - Webster NY
Donald J. Drake - Rochester NY

Xerox Corporation - Stamford CT

B32B 3128

1562735

Process and apparatus for fabricating an extended scanning or printing array in which plural smaller scanning or printing chips are bonded end-to-end onto the surface of a glass substrate having an opaque thermally and/or electrically conductive coating thereon, with the coating removed at discrete sites to allow a photocurable adhesive placed at the sites to be cured through exposure to UV light from underneath the substrate, the photocurable adhesive holding the chips in place while a chip bonding adhesive deposited on the conductive coating where the chips are located is cured to provide a permanent structure.

5098503, Mar 24, 1992

May 1, 1990

7/517178

Donald J. Drake - Rochester NY

Xerox Corporation - Stamford CT

B25B 1102, B23P 1900

156299

A method of fabricating extended arrays of image reading or writing subunits and in particular a pagewidth thermal ink jet printhead from a plurality of discrete thermal ink jet printhead subunits is disclosed. Each thermal ink jet printhead subunit includes a heater plate subunit having a plurality of resistive elements on an upper surface thereof and a channel plate subunit having a plurality of channels corresponding in number and position to the resistive elements on a base surface thereof, the upper surface of the heater plate subunit being attached to the base surface of the channel plate subunit to define a thermal ink jet printhead subunit having a plurality of channels forming nozzles with a resistive element in communication with each channel. The method includes the steps of forming a precision alignment structure such as a notch with, for example, a precision dicing saw, on an upper surface of each channel plate subunit, placing the upper surface of each discrete thermal ink jet printhead subunit on an elongated alignment substrate having a plurality of corresponding alignment structures, and engaging the upper surface of each discrete thermal ink jet printhead subunit with one of the corresponding alignment structures on the alignment substrate. These steps are repeated with subsequent thermal ink jet printhead subunits until an extended array having the length of, for example, a pagewidth is formed.

5755024, May 26, 1998

Dec 18, 1995

8/573733

Donald J. Drake - Rochester NY
Mark A. Cellura - Fairport NY
Hung C. Nguyen - Buena Park CA

Xerox Corporation - Stamford CT

H05B 300

29611

A large array or pagewidth printhead fabricated from printhead elements or subunits. The printhead subunits are butted together at either adjacent channel elements or adjacent heater elements to form a pagewidth printhead. The butting element, either heater or channel element, is slightly wider than the non-butting element thereby providing gaps between the non-butting elements of a printhead element array. Where channel elements are used as the butting element, gaps between the heater elements provide for reduction or elimination of potentially damaging thermal compressive forces between adjacent heater elements. Where heater elements are used as the butting element, structural strength is increased since the heater wafer is stronger than the channel wafer. In addition, the width of the polyimide wall at the edges of the heater wafer is increased providing greater protection for thermal transducers located at the edges of individual heater elements.

5620614, Apr 15, 1997

Jan 3, 1995

8/367619

Donald J. Drake - Rochester NY
Almon P. Fisher - Rochester NY

Xerox Corporation - Stamford CT

H01L 2100, G01D 1518, B44C 122

216 27

A method of fabricating a pagewidth array of buttable printheads reduces end channel damage. The wafer containing a plurality of arrays of channels is provided with V-grooves. A V-groove is positioned between each array. When the wafer is secured to a wafer containing heater plates, wafers are diced along the V-shaped grooves to reduce damage to the end channels of the array to improve print quality.

8567911, Oct 29, 2013

Apr 20, 2010

12/763423

Peter J. Nystrom - Webster NY, US
Donald J. Drake - Rochester NY, US

Xerox Corporation - Norwalk CT

B41J 2/14, B41J 2/16, H01L 21/00

347 47, 438 21

A print module and a method of forming the same, the print module including a substrate, an ink jet die, and an interposer between the substrate and the ink jet die. The substrate includes an ink channel and an air vent, and the die includes a plurality of ink apertures. The interposer includes etched openings therein of a truncated pyramid shape; the openings of the interposer reconfiguring the ink channel and air vent passages between the substrate and die to allow for greater tolerance in alignment and manufacture of the print head module.

6286951, Sep 11, 2001

Oct 31, 2000

9/699514

Donald John Drake - Rochester NY

Xerox Corporation - Stamford CT

B41J 2175

347 93

A method of forming an ink jet printhead with an integral ink filter is provided. The ink jet printhead has decreased flow resistance by formation of two filter array portions. A set of parallel openings are anisotropically etched in a surface of a first substrate to form a first filter array portion. A second substrate having an insulating layer therein is patterned to expose a set of openings forming a second filter array portion. The first and second portions are between an integral ink chamber and ink nozzles so that ink can be filtered through at least one of the first and second filter array portions.

5572244, Nov 5, 1996

Jul 27, 1994

8/280973

Donald J. Drake - Rochester NY
Hung C. Nguyen - Webster NY

Xerox Corporation - Stamford CT

G01D 1518, B41J 216, B41J 214

347 42

A large array or pagewidth printhead fabricated from printhead elements or subunits having adhesive-free butting edges. Each of the printhead elements includes a heater element and a channel element bonded together by an adhesive such as an epoxy. A space or adhesive-receiving aperture is formed between the channel element and the heater element before mating so that any adhesive forced from between the channel element and heater element by the pressure of mating does not flow onto the butting surfaces, but instead overflows into the space thereby maintaining an adhesive free butting edge. The channel element includes an etch trough which forms the space. The printhead elements are butted together to form a large array printhead. The absence of adhesive on the butting edges improves manufacturability of the large array printhead.