Hewlett-Packard Development Company, L.p.

Hewlett-Packard Company

Jennifer M Korngiebel

Steven L Webb

Tod S Heiles

Arun K Agarwal

Neal W Meyer

Jeffrey D Rutland

Kit C Baughman

Jeffrey H Barr

Harold Lee Van Nice

Salim Khasawinah

Ronald Albert Askeland

Matthew David Giere

Noah C Lassar

Miquel Boleda Busquets

Satya Prakash

Alberto Borrego Lebrato

Dorkaitz Alain Vazquez Fernandez

Ana Oropesa Fisica

Alvin Zheng-Hui Yu

Ryan Suelzle

Example implementations provide a controller to determine a printing fluid abnormality associated with an ink supply channel of a printer; the controller comprising: an input to receive a signal output by a pressure sensor; the signal being indicative of ink pressure associated with the ink supply channel, and a monitor to determine from a characteristic of the signal the presence of an abnormality in the printing fluid.

Monitoring printing fluids

Described is a method which corrects for malfunctioning or inoperable ink ejection elements in a one-pass printmode. The method comprises obtaining the standard printmask; identifying the ink ejection elements which are malfunctioning; ascertaining ink ejection elements adjacent to the ejection elements which are malfunctioning; selecting particular adjacent ink ejection elements from the adjacent ink ejection elements; and modifying the standard printmask by adjusting the amount of ink deposited by the selected adjacent ink ejection elements to create a modified printmask.

Method to correct for malfunctioning ink ejection elements in a single pass print mode

A method of correcting for malfunctioning ink ejection elements in a printing system using a single pass over a recording medium which includes obtaining a standard printmask, identifying ink ejection elements which are malfunctioning, ascertaining an original color measurement value for each pixel which will be printed with the malfunctioning ink ejection elements, determining a replacement color measurement value closest in value to the original color measurement value which does not use the malfunctioning ink ejection elements for each pixel which will be printed with the malfunctioning ink ejection elements and modifying the standard printmask by adjusting the number and color of ink drops deposited based on the replacement color measurement value for each pixel which will be printed with the malfunctioning ink ejection elements to create a modified printmask.

Method to correct for color error caused by malfunctioning ink ejection elements

A novel polymeric orifice plate for a printhead. The plate includes a recess in the top surface thereof which terminates at a position between the top and bottom plate surfaces. The recess communicates with a bore which passes through the remainder of the plate and terminates at the bottom surface. The recess has an upper end with a first opening therein, a lower end with a second opening therein, a side wall, and a bottom wall at the lower end The first opening is larger than the second opening. Application of physical force to the plate does not disturb the second opening in the recess which is &ldquo;inset&rdquo;. The recessed bottom wall (and possibly the top surface) of the plate may include at least one layer of coating material thereon for protective, wettability-control, and other purposes. These designs insure proper ink drop trajectory and high-quality image generation.

High efficiency orifice plate structure and printhead using the same

A novel polymeric orifice plate for a printhead. The plate includes a recess in the top surface thereof which terminates at a position between the top and bottom plate surfaces. The recess communicates with a bore which passes through the remainder of the plate and terminates at the bottom surface thereof. The recess has an upper end with a first opening therein, a lower end with a second opening therein, and a side wall which is preferably oriented at a right angle relative to the top surface of the plate. The recess may also have a bottom wall at the lower end. The first opening is larger than the second opening. The application of physical force to the plate does not disturb the second opening in the recess which is 'inset' and protected. This design insures proper ink drop trajectory and the generation of high-quality printed images.

Growing community of inventors

Escondido, CA, United States of America

Jennifer M Korngiebel