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| Number | Title | Issue Date |
| 8055147 | Image forming apparatus having a calibration section for an image density sensor Toner images of reference patterns having different resolutions are formed on an image carrier, image densities of the toner images of reference patterns are detected by a density sensor, and an output of the density sensor, when the detected densities equate among ... | 11/08/2011 |
| 7933531 | Image formation device An electrophotographic image formation device comprises an image transfer unit (including an image transfer member) attached to a main body in a detachable manner, a density detecting unit including a detector unit and thereby detecting density of a developing agent... | 04/26/2011 |
| 7751741 | Optical sensor and image forming apparatus including same An optical sensor includes a light-emitting element for directing light to an image, a light-receiving element for receiving light reflected by the image, a normal detection optical path for allowing the light emitted by the light-emitting element and the light refl... | 07/06/2010 |
| 7720402 | Method and apparatus for image forming capable of controlling toner concentration accurately A toner-concentration controller includes a controller configured to control a toner supply amount in accordance with a detection result of a toner-concentration of two-component toner, and a sensor unit configured to detect the toner-concentration of two-component ... | 05/18/2010 |
| 7676169 | Multipath toner patch sensor for use in an image forming device A toner patch sensor for use in an image forming device may be operated in different modes according to the color of the patch being sensed. The toner patch sensor may include a detector and a source adapted to transmit light that is reflected off a toner patch and ... | 03/09/2010 |
| 7676170 | Toner density detection apparatus and image forming apparatus having the same A toner density detection apparatus has a sensor unit and a controller. The sensor unit irradiates a toner patch formed on an image carrier with light, splits the light reflected by the toner patch into first and second light components, receives the first and secon... | 03/09/2010 |
| 7379683 | Mark detector, drive controller, belt drive unit, and image forming apparatus A mark detector optically detecting a scale having multiple marks formed successively at predetermined intervals along the moving direction of an endless belt member, and outputting an electrical signal corresponding to the presence or absence of the marks when the ... | 05/27/2008 |
| 7305195 | Image forming apparatus, method of calculating amount of toner transfer, methods of converting regular reflection output and diffuse reflection output, method of converting amount of toner transfer, apparatus for detecting amount of toner transfer, gradation pattern, and methods of controlling toner density and image density An amount of toner transfer on a reference pattern is calculated by using an optical detecting unit that detects both regular reflection light and diffuse reflection light from a detection target simultaneously, based on a relative ratio between a value obtained by ... | 12/04/2007 |
| 7292799 | Image forming apparatus using detection of toner image on image bearing member In an image forming apparatus provided with an image forming portion for forming a toner image on a rotatable image bearing member, and a detecting portion for detecting a toner image for detection formed on the image bearing member, wherein the state of the image f... | 11/06/2007 |
| 7260336 | Image forming apparatus and image forming method for performing density control of toner images In a density control technique wherein a density of a toner image formed as a patch image is detected for performing density control based on the detected result, detection errors are decreased so as to properly set a density control factor. The density control fact... | 08/21/2007 |
| 7245841 | Electrophotographic apparatus An image detector has an I/V converter for converting, into a voltage output., a current output as a result of a photoelectric element arranged in a traveling direction of an intermediate transfer belt having received light reflected from the intermediate transfer b... | 07/17/2007 |
| 7221807 | Methods and systems for digital image characteristic adjustment using a neural network Embodiments of the present invention comprise methods and systems for automatically adjusting images to conform to preference data. ... | 05/22/2007 |
| 7194214 | Patch density measuring apparatus and image forming apparatus When a regular reflection light receiving unit is receiving a reflected light in a non-image area where the test patches are not formed, a clamp switch is closed. Then, a first reference voltage generated by a pull-up resistor and a zener diode is corresponded to an... | 03/20/2007 |
| 7194216 | Method and apparatus for measuring toner concentration A device to measure toner concentration can include a selector that selects a type of developer material to be measured and a sensor that detects an amount of light reflected off a developer material. A controller within the device can determine a value correspondin... | 03/20/2007 |
| 7171133 | Image forming apparatus using detection of toner image on image bearing member In an image forming apparatus provided with an image forming portion for forming a toner image on a rotatable image bearing member, and a detecting portion for detecting a toner image for detection formed on the image bearing member, wherein the state of the image f... | 01/30/2007 |
| 7167658 | Image forming apparatus which corrects an output of a sensor for detecting image gradation characteristics An image forming apparatus, comprising: an image forming section for forming and outputting a predetermined gradation patch pattern image on transfer paper; a sensor for reading and outputting the gradation patch pattern image; and a control section for correcting r... | 01/23/2007 |
| 7167255 | Method for displaying desired message in display unit of data processing apparatus for various processes A data processing apparatus comprises process means for executing a predetermined process based on the input instruction, connection means for connection with an external device, display means for displaying information based on the data received from the external d... | 01/23/2007 |
| 7162187 | Image forming apparatus and image forming method In an image forming apparatus, a toner image is formed on a photosensitive element and a transfer roller, which carries a transfer medium, is pressed against a photosensitive element at a pressure of from 20.4 N/cm2 to 200 N/cm2. ... | 01/09/2007 |
| 7123019 | Polarographic densitometer A polarographic densitometer has a voltage applying circuit, a sensor unit, an impedance reduction circuit, and a current/density conversion unit. The voltage applying circuit applies specified voltage, and the sensor unit includes a group of electrodes to produce a... | 10/17/2006 |
| 7071908 | Digital backplane The present invention provides a various methods, systems and devices for controlling light modulating elements and/or spatial light modulators. In some embodiments of the present invention, a recursive feedback method is used to control light modulating elements an... | 07/04/2006 |
| 7035578 | Image shifting in a digital printer to reduce image artifacts A printing machine (10) is disclosed in which printing is effected by toner being transferred from a photoconductor (18) to a receiver sheet (S) at a transfer station (46). A fuser (49) is also provided to fuse the transferred toner to th... | 04/25/2006 |
| 7020404 | Image forming apparatus with color shift sensors that are shielded from toner An image forming apparatus forms a toner image on a toner image bearing body and the toner image is transferred onto a recording medium. An image forming section forms the toner image on the toner image bearing body, which may be a transfer belt. A reading section o... | 03/28/2006 |
| 6912064 | Image forming apparatus and image forming method using the same In order to accurately correct environmental variation and aged variation of gamma characteristics, RGB tone data are color-converted to be formed as CMYK tone data, then a tone correction for improving gamma characteristics is performed on the CMYK tone data. The C... | 06/28/2005 |
| 6873804 | Image sensing device An image sensing device includes: a light source, a recording member on which an image is formed and conveyed in one direction, illumination system for causing a light beam emitted from the light source to obliquely illuminate the recording member and, imaging syste... | 03/29/2005 |
| 6850718 | Image forming apparatus for adjusting predetermined developer density values based on a target value and sensed patch developer density An image forming apparatus of the present invention includes an image carrier on which a developer is to be deposited by an electrophotographic system. A controller controls the amount of the developer to deposit on the image carrier by varying a potential for devel... | 02/01/2005 |
| 6633734 | Image forming apparatus having density detecting means An image forming apparatus has an image bearing member, and a density detecting device for detecting the density of an image for density detection formed on the image bearing member. Image forming conditions are controlled on the basis of an output from t... | 10/14/2003 |
| 6611666 | Densitometer with improved accuracy for use in color image processing apparatus A method and apparatus for a single densitometer design that is used for all colors within multiple color image processing system. The preferred embodiment employs an LED having a light adjustment mechanism for controlling the amount of light received by ... | 08/26/2003 |
| 6510297 | Toner density sensor An object of the invention is to provide a toner density sensor capable of detecting toner density with high accuracy without being affected by the temperature change. A light-emitting diode emits infrared light toward the toner attached to the surface of... | 01/21/2003 |
| 6427057 | Image-forming machine with a pulse densitometer This invention provides an image-forming machine with a pulse densitometer that avoids the formation of artifacts on electrophotographic films. The image-forming machine may have a charger, an exposure machine, a toning station, a transfer charger, a fusi... | 07/30/2002 |
| 6393228 | Toner amount measuring apparatus and method, and image forming apparatus using the same A toner amount measuring apparatus includes an irradiating unit which divides a flux of laser beams emitted from a laser diode into two fluxes of laser beams by an obtuse-angled prism and makes the two light fluxes interfere with each other to form interf... | 05/21/2002 |
| 6385411 | Densitometer diagnostic system for an image-forming machine The invention provides a diagnostic system for a densitometer in an image-forming machine. An image-forming machine with a densitometer diagnostic system may have a photoconductor, one or more chargers, an exposure machine, a toning station, and a densito... | 05/07/2002 |
| 6321044 | Image forming apparatus and method An image forming apparatus of the present invention includes an image formation unit for forming a developer image on a photosensitive drum, a transfer belt for conveying a sheet while placing it on a transfer surface and for allowing the developer image ... | 11/20/2001 |
| 6229972 | Digital densitometer with calibration and statistics A densitometer with built-in data processing capability uses synchronizing signals to collect data at defined spots on a moving endless belt or drum test sample. A calibration cycle accumulates data for later use in measurement correction. After correctio... | 05/08/2001 |
| 6223585 | Method of accurately measuring control film density regions A method of accurately measuring control film density regions comprising: exposing a photosensitive film to a modulated laser beam at three known laser beam intensities representing maximum, midrange and minimum intensities to form corresponding separate ... | 05/01/2001 |
| 6061533 | Gamma correction for apparatus using pre and post transfer image density An image forming apparatus performs the gamma correction based on an image density on a photosensitive body or an intermediate transfer body. In the image forming apparatus, a test pattern generator unit generates a test image on the photosensitive body o... | 05/09/2000 |
| 6055386 | Apparatus and method for detecting developing ability of an image forming apparatus with varied LED continuous lighting time for image forming and process control modes An image forming apparatus includes an photoconductive drum, a charger, an exposing device, a developing device and a transferring device. A photo-sensor is disposed around the photoconductive drum. The photo-sensor senses the intensity of the reflected l... | 04/25/2000 |
| 6038413 | Document original simulator for image fogging detection, and image fogging troubleshooting method and image forming apparatus using the same A document original simulator including first tone simulation portion having substantially the same reflectance as a white original sheet and a second tone simulation portion having a lower reflectance than the first tone simulation portion. When an image... | 03/14/2000 |
| 5995777 | Image forming apparatus and examination image forming method in image forming apparatus An image forming apparatus of the present invention includes an exposure portion to form an electrostatic latent image by exposing the surface of an image carrier, a developing device to form a developer image by developing the electrostatic latent image ... | 11/30/1999 |
| 5953554 | Image forming apparatus with a toner density measuring function The static latent image formed on the photoreceptor which has been charged, by exposing it to light, is developed through four colors of developing units, i.e., yellow, magenta, cyan and black, forming toner images on the photoreceptor. These toner images... | 09/14/1999 |
| 5903800 | Electrostatographic reproduction apparatus and method with improved densitometer An electrostatographic recording apparatus includes an endless recording member upon which toner images are recorded. A densitometer is provided for measuring density of a toned area on the recording member. The densitometer includes a light emitting and/... | 05/11/1999 |
