Abstract: An e-paper imaging system includes a writing unit and a support surface to support a passive e-paper media in a position spaced apart from the writing unit. The writing unit includes a charge generator and an electrode array. The electrode array includes addressable holes to control charges flowing to the support surface.

Abstract: An e-paper imaging system includes a writing unit and a support surface to support a passive e-paper media in a position spaced apart from the writing unit. The writing unit includes a charge generator and an electrode array. The electrode array includes addressable holes to control charges flowing to the support surface.

Abstract: An e-paper imaging system includes a writing unit and a support surface to support a passive e-paper media in a position spaced apart from the writing unit. The writing unit includes a charge generator and an electrode array. The electrode array includes addressable holes to control charges flowing to the support surface.

Abstract: Examples described herein relate to a control for a non-contact charging roller. For example, a charging assembly may control a selectable non-contact distance between a charge roller and an imaging surface.

Abstract: An e-paper imaging system includes a writing unit and a support surface to support a passive e-paper media in a position spaced apart from the writing unit. The writing unit includes a charge generator and an electrode array. The electrode array includes addressable holes to control charges flowing to the support surface.

Abstract: A charging assembly controls a selectable non-contact distance between a charge roller and an imaging surface.

Abstract: A method for determining optical density is disclosed. A first measurement is taken on a white area of a substrate (402). A second measurement is taken on an area of the substrate printed with ink (404). A relative optical density of the ink is determined using the first and second measurements (406).

Abstract: Measurement devices, systems, and methods to measure a high field conductivity of a fluid are provided herein. The measurement device includes a fluid cell, a pair of electrodes, a voltage switch, and a measurement unit. The fluid cell is on an inclined plane to receive the fluid. The pair of electrodes are connected to the fluid cell. The pair of electrodes are spaced apart from one another to receive the fluid therebetween and positioned parallel to one another to pass an electrical current therethrough. The power unit provides a high voltage power supply to one electrode of the pair of electrodes. The measurement unit measures the electrical current that passes between the pair of electrodes through the fluid.

Abstract: A computer accessory device configured to communicate with a computer includes a two-dimensional sensor array configured to generate image data as the device is moved over a surface. A first memory is configured to store a first set of images based on a first set of the image data. A second memory is configured to store a second set of images based on a second set of the image data. The second set of images is configured to be stitched-together into a stitched-together image. At least one controller is configured to generate navigation information based on the first set of images. The navigation information is indicative of displacement and rotation of the device.

Abstract: Measurement devices, systems, and methods to measure a high field conductivity of a fluid are provided herein. The measurement device includes a fluid cell, a pair of electrodes, a voltage switch, and a measurement unit. The fluid cell is on an inclined plane to receive the fluid. The pair of electrodes are connected to the fluid cell. The pair of electrodes are spaced apart from one another to receive the fluid therebetween and positioned parallel to one another to pass an electrical current therethrough. The power unit provides a high voltage power supply to one electrode of the pair of electrodes. The measurement unit measures the electrical current that passes between the pair of electrodes through the fluid.

Abstract: An example hard imaging device includes an interface to access image data corresponding to images to be formed using the hard imaging device. The example hard imaging device further includes processing circuitry in communication with the interface to access the image data, to access correction data corresponding to a geometric distortion of a scan lens of an optical scanning system of the hard imaging device, and to modify the image data according to the correction data to reduce image errors introduced during optical scanning of the image data using the optical scanning system.

Abstract: At least some aspects of the disclosure are directed towards densitometers and methods of determining optical density of printed images upon media. According to one example, an optical density determination apparatus includes a first light source configured to emit a first light beam in a first direction towards a substrate; a second light source configured to emit a second light beam in a second direction towards the substrate, the second direction being different than the first direction; a first sensor configured to sense light of the first light beam reflected from the substrate; a second sensor configured to sense light of the second light beam reflected from the substrate; and wherein the first and second sensors are configured to provide signals indicative of the light sensed by the first and second sensors and which are useable to determine optical density of the substrate.

Abstract: A printer apparatus 100 includes a reflection densitometer 102 comprising an optical sensor 104 that detects light reflected from each color patch on each page in a sequence of measurements, and a processor 106 which is coupled to the optical sensor 104 and manages the calibration and measurement operations. The processor 106 determines the magnitude of a gloss component of the illumination and compares the gloss component magnitude from a plurality of measurements at selected dissimilar ink coverage.

Abstract: A method for determining optical density is disclosed. A first measurement is taken on a white area of a substrate (402). A second measurement is taken on an area of the substrate printed with ink (404). A relative optical density of the ink is determined using the first and second measurements (406).

Abstract: Hard Imaging Methods, Liquid Marking Agent Monitoring Methods, and Hard Imaging Devices are described. According to one embodiment, a hard imaging method includes forming a plurality of latent images using a hard imaging device, using the hard imaging device, developing the latent images using a liquid marking agent, wherein bubbles are present in the liquid marking agent during the developing, calibrating the hard imaging device, and reducing bubbles present in the liquid marking agent during the calibrating compared with the bubbles present in the liquid marking agent during the developing. Additional embodiments are described in the disclosure.

Abstract: Hard imaging methods, hard imaging device fabrication methods, hard imaging devices, hard imaging device optical scanning systems, and articles of manufacture are described. According to one embodiment, a hard imaging method includes providing image data corresponding to a hard image to be formed; generating light responsive to the image data; scanning the light to form a latent image corresponding to the hard image to be formed; accessing correction data corresponding to scanning errors of a scan lens intermediate a rotating reflection device and a photoconductor; and modifying the image data using the correction data before the generating, the modifying comprising modifying to reduce the introduction of image errors resulting from the scanning using the scan lens.

Abstract: At least some aspects of the disclosure are directed towards densitometers and methods of determining optical density of printed images upon media. According to one example, an optical density determination apparatus includes a first light source configured to emit a first light beam in a first direction towards a substrate; a second light source configured to emit a second light beam in a second direction towards the substrate, the second direction being different than the first direction; a first sensor configured to sense light of the first light beam reflected from the substrate; a second sensor configured to sense light of the second light beam reflected from the substrate; and wherein the first and second sensors are configured to provide signals indicative of the light sensed by the first and second sensors and which are useable to determine optical density of the substrate.

Abstract: Hard imaging methods, hard imaging device fabrication methods, hard imaging devices, hard imaging device optical scanning systems, and articles of manufacture are described. A hard imaging method includes providing image data corresponding to a hard image to be formed and generating light responsive to the image data. The method further includes scanning the light to form a latent image corresponding to the hard image to be formed and accessing correction data corresponding to scanning errors of a scan lens intermediate a rotating reflection device and a photoconductor. The method also includes modifying the image data using the correction data before the generating and the modifying including modifying to reduce the introduction of image errors resulting from the scanning using the scan lens.

Abstract: A computer accessory device configured to communicate with a computer includes a two-dimensional sensor array configured to generate image data as the device is moved over a surface. A first memory is configured to store a first set of images based on a first set of the image data. A second memory is configured to store a second set of images based on a second set of the image data. The second set of images is configured to be stitched-together into a stitched-together image. At least one controller is configured to generate navigation information based on the first set of images. The navigation information is indicative of displacement and rotation of the device.

Abstract: A method of charging an imaging member having an outer surface with an imaging region and a seam region. A charge device is provided adjacent the imaging member. An electrical charge is provided to the imaging region of the imaging member using a voltage on the charge device. An other electrical charge is provided to the seam region of the imaging member using an other voltage on the charge device.