Hewlett-packard Development Company, L.P.

Hp Indigo B.v.

Hewlett-packard Indigo B.v.

Eyal Shelef

Shlomo Harush

Ran Waidman

Gregory Braverman

Sasi Moalem

Yaron Grinwald

Gal Amit

Omer Gila

Albert Teishev

Carl Staelin

Dror Kella

Ruth Bergman

Mani Fischer

Reut Avigdor

Tony Azzam

Yael Kowal-Blau

Samer Farran

Regina Guslitzer

Doron Shaked

Ziv Gilan

Guy Nesher

Gideon Amir

Tehila Ben-Ezra

Tsafrir Yedid-Am

Ron Maurer

Michal Aharon

William David Holland

Gil Bar-Haim

Marie Vans

Ilanit Mor

Michael Plotkin

Haim Yosef Cohen

Haim Livne

Darryl Greig

Craig Breen

Emad Masoud

Getahun Biadglin

Shaul Haim Raz

Benjamin Dayan

Ayelet Pnueli

Alina Grishman

Danny Feldman

Adi Vinegrad

Yohanan Sivan

Roy Har-Tsvi

Mirta Perlman

Gadi Oron

Maya Shalev

Anna Hen

Elkan Jhirad

Gregory Braveman

Ido Elad

Barak Markus

Gidl Amir

Haim Livine

Provided in one example herein is a liquid electrophotographic ink composition. The composition includes a charge director, a non-polar carrier fluid comprising a polymer; and ink particles each including a polymeric resin and a pigment dispersed in the resin. The ink composition also includes a tackifier.

Ink composition

This disclosure relates to a liquid electrophotographic composition comprising a thermoplastic polymer resin, a charge adjuvant, microspheres, and a liquid carrier. Each microsphere comprises a shell of material encapsulating a gas. The microspheres are present in an amount of 5 to 90 weight % of the total weight of solids in the composition.

Electrophotographic composition

Herein is described a liquid electrostatic ink composition comprising a pigment comprising mica coated with titanium dioxide and an additional metal oxide.

Electrostatic ink composition

An apparatus to calibrate a printer. The apparatus comprises a controller to: control deposition of white printing material on media, the white printing material having an opacity of at least 55%; control deposition of non-white printing material on the white printing material; receive data for at least one sensed characteristic of the non-white printing material; and calibrate the printer using the received data for the at least one sensed characteristic of the non-white printing material.

To calibrate a printer

A liquid electrophotographic varnish composition comprising: a polymer resin; an epoxy-based cross-linking agent; a solid catalyst comprising at least one amine group; and a carrier liquid.

Liquid electrophotographic varnish composition

Herein is disclosed a magenta liquid electrostatic ink composition comprising a carrier liquid; and ink particles comprising a resin, a magenta pigment and a black pigment, wherein the black pigment is present in the composition in an amount of 0.01 to 0.5 wt % by total solids of the composition.

Electrostatic ink compositions

Printing by determining target color values based on first color outputs, determining current color values based on current color outputs, and calculating color compensation values to compensate for a difference between the target color values and the current color values.

Printing with continuous color calibration

Apparatus for embossing media, the apparatus including cutter apparatus to cut a shape in a surface layer of a multi-layer substrate to form a die. The apparatus also includes an embosser to emboss the media using the die. The cutter apparatus is arranged to provide the die to the embosser.

Embossing media

A method of accurately printing a target color is provided. The method comprises: in a first step measuring the light spectrum () of a first printed color sample (), which has been printed with a first ink coverage; and from the measured light spectrum calculating a color discrepancy between the first printed color sample and the target color. The method further comprises in a second step calculating an improved ink coverage (), and printing a second color sample with the improved ink coverage (). The aforementioned steps are repeated until a predetermined condition for accuracy of the target color has been reached ().

Accurate printing of a target colour

Image forming devices, hard imaging methods, and methods of determining a transfer function are described. According to one embodiment, an image forming device includes an image engine configured to provide a marking agent upon media, processing circuitry configured to control the image engine to form a test image upon the media having a specified coverage of the marking agent and to access measurement data indicative of a measured coverage of the marking agent of the test image, storage circuitry configured to store data comprising associations of a plurality of specified coverage values of the marking agent and a plurality of resultant coverage amounts of the marking agent formed upon the media by the image engine corresponding to respective ones of the specified coverage values, and wherein the processing circuitry is further configured to access image data of an image to be formed to identify one of the specified coverage values of the marking agent to be formed upon the media to form the image, to modify the one specified coverage value using the stored data and the measurement data to provide an imaging coverage value, and to control the image engine using the imaging coverage value to form the hard image.

Image forming devices, hard imaging methods, and methods of determining a transfer function

A method for monitoring development parameters of a liquid toner electrophotographic (LEP) printer, the method comprising defining an operational window for a current utilized by the printer and monitoring the current to determine a deviation of the current outside the operational window.

Development monitoring method and system

Imaging methods, imaging device calibration methods, imaging devices, and hard imaging device sensor assemblies are described. According to one aspect, an imaging method includes forming a hard color image upon media using image data, the hard color image corresponding to the color image, and after the forming, sensing an optical characteristic of the hard color images at a plurality of different spatial locations of individual ones of the hard color images, and providing information regarding the optical characteristic at the different spatial locations of the hard color image after the sensing.

Imaging methods, imaging device calibration methods, imaging devices, and hard imaging device sensor assemblies

A method of calibrating an electrophotographic printer (), the printer configured with a plurality of light settings, each light setting arranged to produce a different element type, the method comprising: determining (S) a first light level required to print a first element type by applying a proportional change to a first initial light setting; and determining (S) a second light level required to print a second element type by applying substantially the same proportional change to a second initial light setting.

Printer, printing method and printer calibration method

A charge director injection system includes a charge director tank, a liquid toner tank, a charge director pump to pump charge director from the charge director tank into the liquid toner tank, and a control system configured to measure a change in charge density per amount of charge director injected into the liquid toner tank, and create a charge profile indicating a relationship between amount of charge director injected into the liquid toner and change in charge density of the liquid toner within the liquid toner tank.

Charge director injection system

Growing community of inventors

Tel Aviv, Israel

Eyal Shelef