Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 8099005 | Image forming apparatus A printer determines, in a process control, a reference exposure amount. A charging unit charges a surface of a photosensitive element to a target potential. After an exposure target area on the charged surface of the photosensitive element is exposed to a high adju... | 01/17/2012 |
| 8045870 | Image forming apparatus having brush and cleaning blade to remove toner remaining on image carrier An image forming apparatus includes: an image carrier; a charging unit which charges a surface of the image carrier; a brush which removes toner remaining on the image carrier by rubbing the surface of the image carrier; a cleaning blade provided downstream of the b... | 10/25/2011 |
| 8041240 | Closed loop charge control to minimize low frequency charge non-uniformity This is a system to improve final xerographic image by providing uniformity in both pre-imaged and imaged photoconductive drums or belts. An ESV is placed after the exposure imaging station so that it can measure the voltage on the photoreceptor (PR) belt or drum ob... | 10/18/2011 |
| 7962056 | Method and apparatus for speed change detection based on a latent image pattern A speed change detection apparatus includes an image carrier for carrying a latent image, and a latent image pattern forming device for forming a latent pattern image on the image carrier. The pattern image includes periodically formed line or dot images. An alterna... | 06/14/2011 |
| 7929875 | Image forming apparatus An image forming apparatus, including: a photoconductor; a charging section to apply an electrical potential onto a surface of the photoconductor; a cleaning device to remove toner particles remaining on the surface of the photoconductor; a coating section to coat t... | 04/19/2011 |
| 7899348 | Image forming apparatus with developing bias correcting portion that changes a developing density adjustment pattern A controller takes in a detection signal indicating the surface electrical potential of a photoconductive drum (7) from a surface electrical potential sensor (step #1), and determines whether the surface electrical potential is smaller than the predete... | 03/01/2011 |
| 7890005 | Adjusting electrostatic charges used in a laser printer A method, system, and manufacture for adjusting electrostatic charges in a laser printer. A charge is applied to a photoconductor drum surface to create a dark voltage. An image area of the photoconductor drum is exposed with a printhead using a defined energy level... | 02/15/2011 |
| 7881627 | Image forming apparatus An image forming apparatus includes image bearing member having a movable surface; charging means for charging the surface of the image bearing member; image exposure means for exposing the surface of the image bearing member charged by the charging means to light i... | 02/01/2011 |
| 7783213 | Method and device for measuring surface potential distribution, method and device for measuring insulation resistance, electrostatic latent image measurement device, and charging device A surface potential distribution measurement method and device including setting a sample having a surface with a surface potential distribution in a sample installation unit wherein both an electric field intensity formed on the sample surface and a potential bias ... | 08/24/2010 |
| 7783212 | Thickness variation detector of photoconductor, image formation unit, image formation apparatus and method for thickness variation of photoconductor A thickness variation detector of a photoconductor includes: a current detection unit that detects a value of current being used for charging a surface of the photoconductor in a state in which a charging unit is in contact with a surface of the photoconductor; and ... | 08/24/2010 |
| 7747184 | Method of using biased charging/transfer roller as in-situ voltmeter and photoreceptor thickness detector and method of adjusting xerographic process with results The dielectric thickness of a photoreceptor is determined in a variety of ways, including using a relationship between threshold voltage and dielectric thickness, using a relationship between dielectric thickness and the difference between biased transfer roller (BT... | 06/29/2010 |
| 7596330 | Determining a location of an uncharged region on a photoconductive drum A method for determining a location of an uncharged region on a photoconductive drum in an electrophotographic device, including rotating the photoconductive drum, and charging a surface of the drum via a charge roller by application of a voltage to the charge rolle... | 09/29/2009 |
| 7593654 | Mass-based sensing of charging knee for active control of charger settings A xerographic marking engine adjusts a charging actuator, such as an AC peak-to-peak voltage or an AC peak-to-peak AC current, based upon toner patch density measurements made using, e.g., a toner patch density sensor. The sensor is used to detect a knee in a toner ... | 09/22/2009 |
| 7477856 | Method and apparatus for image forming capable of effectively preventing resonance of frequencies An image forming apparatus including an image bearing member, a charging member, and a measuring member. The image forming member is configured to bear an image. The charging member is configured to charge a surface of the image bearing member when a direct current ... | 01/13/2009 |
| 7460803 | Electric potential measuring device using oscillating device, image forming apparatus, and electric potential measuring method To provide an electric potential measuring device which is useful in realizing size reduction, high sensitivity, and high reliability. The electric potential measuring device includes: an oscillating device which includes torsion springs, and an oscillating body axi... | 12/02/2008 |
| 7457552 | Image forming apparatus and control method thereof Image forming apparatus in which surface electric potentials of a plurality of surface areas are detected by charging a photoconductor with a different applied bias for each predetermined timing and exposing a plurality of surface areas of the photoconductor by scan... | 11/25/2008 |
| 7440133 | Mode switching in a color printer A tandem-type color image forming apparatus forms an image in a monochrome mode or in a full color mode. The apparatus has a controller which delays an image forming operation for a predetermined period of time when a color mode is switched from the monochrome mode ... | 10/21/2008 |
| 7433611 | Image forming apparatus that judges lifetime of photosensitive unit The residual potential and charging potential of the surface of a photosensitive drum 20, or the charging potential and exposure potential of the surface of the photosensitive drum 20 are detected by an exposure sensor 28. The lifetime of the ph... | 10/07/2008 |
| 7428388 | Image formation apparatus with image correction capability An image formation apparatus includes an imaging light source, a photosensitive body and a correction light source. The imaging light source outputs light modulated in accordance with image data representing an image. An electrostatic latent image is formed at the p... | 09/23/2008 |
| 7421218 | Image forming apparatus with surface potential detection An image forming apparatus having a heating device that is configured to heat an image bearing member so that the detection of the surface potential of the image bearing member can be controlled with greater stability. The image forming apparatus utilizes a surface ... | 09/02/2008 |
| 7400839 | Method and device for measuring surface potential distribution, method and device for measuring insulation resistance, electrostatic latent image measurement device, and charging device A surface potential distribution measurement method and device including setting a sample having a surface with a surface potential distribution in a sample installation unit wherein both an electric field intensity formed on the sample surface and a potential bias ... | 07/15/2008 |
| 7395000 | Image-forming device with control of developer bias In an image-forming device, a controller controls the value of an effective developer bias that is established between the electric potential of a latent image formed on an image bearing body and the electric potential of a developer bearing body, to thereby develop... | 07/01/2008 |
| 7379681 | Image forming apparatus and control method thereof Image forming apparatus in which surface electric potentials of a plurality of surface areas are detected by charging a photoconductor with a different applied bias for each predetermined timing and exposing a plurality of surface areas of the photoconductor by scan... | 05/27/2008 |
| 7372278 | Electric potential measuring apparatus electrostatic capacitance measuring apparatus, electric potential measuring method, electrostatic capacitance measuring method, and image forming apparatus An electric potential measuring apparatus includes a detecting electrode, a modulator for changing an electrostatic capacitance between a measurement object and the detecting electrode by mechanical vibration, a charge detector for detecting the amount of charges el... | 05/13/2008 |
| 7359650 | Image forming apparatus and method for judging the lifetime of a photosensitive unit The residual potential and charging potential of the surface of a photosensitive drum 20, or the charging potential and exposure potential of the surface of the photosensitive drum 20 are detected by an exposure sensor 28. The lifetime of the ph... | 04/15/2008 |
| 7356273 | Image forming apparatus with switched-potential responsive to attenuation of a remaining voltage An image forming apparatus changes over an electric potential on an image bearing member in response to an attenuation region in which a remaining potential on an image bearing member attenuates after a developing bias applied to the developing member has been turne... | 04/08/2008 |
| 7356276 | High voltage generator and method of sensing roller resistance Provided are a high voltage generator of an image forming apparatus, which simplifies a circuit structure and reduces the number of control signals by commonly using a roller resistance sensing circuit unit, and a method of sensing roller resistance. The high voltag... | 04/08/2008 |
| 7343120 | Addition of liquid charge control agents to toner in toner development stations of electrographic reproduction apparatus Controlling the charge on toner in a development station of an electrographic reproduction apparatus, wherein data relative to latent image charge carrying member voltage and image density control patches are sensed and development potential to achieve an aim densit... | 03/11/2008 |
| 7343121 | Addition of liquid charge control agents to toner in toner development stations of electrographic reproduction apparatus Controlling the charge on toner in a development station of an electrographic reproduction apparatus, wherein data relative to latent image charge carrying member voltage and image density control patches are sensed and development potential to achieve an aim densit... | 03/11/2008 |
| 7336910 | Image forming apparatus with gamma conversion means The invention provides an image forming apparatus and an image forming method, capable of providing an image with little deterioration, even in case the image contrast has to be adjusted not for the purpose of image adjustment, such as for reducing the toner consump... | 02/26/2008 |
| 7324766 | Cross-process charge uniformity scanner In a xerographic printing apparatus, feedback on surface charge at a plurality of locations across a length of a photoreceptor may be desirable to assess charge uniformity, for example, to ensure color consistency across multiple marking engines in tightly integrate... | 01/29/2008 |
| 7324776 | Image forming apparatus, charge controlling apparatus, and image forming method A color printer including, a conductive brush roller to contact a photosensitive drum at a position downstream of a transferring apparatus and upstream of a charging apparatus, wherein at least part of residual toner is collected after temporarily transferring on th... | 01/29/2008 |
| 7298983 | Method for detecting lateral surface charge migration through double exposure averaging The amount of lateral charge migration (LCM) on a photoreceptor is quantified by measuring the average potential of a latent image formed on the photoreceptor surface. The surface is first uniformly charged, then exposed a first time to an image. After a waiting per... | 11/20/2007 |
| 7274193 | Micromechanical potential sensor A potential sensor (101) including first and second detection electrodes (121 a, b) opposed to an object of which a potential is to be measured, and a movable shutter (125) so positioned between the detection electrodes and the potential-... | 09/25/2007 |
| 7265554 | Electric potential measuring device and image forming apparatus An electric potential measuring device includes a detection electrode of a conductive material disposed in opposition to an object and a movable structure includes a first solid material portion of another dielectric and a second solid material portion of another di... | 09/04/2007 |
| 7263299 | Image forming apparatus that judges lifetime of photosensitive unit The residual potential and charging potential of the surface of a photosensitive drum 20, or the charging potential and exposure potential of the surface of the photosensitive drum 20 are detected by an exposure sensor 28. The lifetime of the ph... | 08/28/2007 |
| 7259885 | Image forming apparatus with gamma conversion means The invention provides an image forming apparatus and an image forming method, capable of providing an image with little deterioration, even in case the image contrast has to be adjusted not for the purpose of image adjustment, such as for reducing the toner consump... | 08/21/2007 |
| 7254349 | Image forming apparatus having means to control condition of current supply to discharge wire and grid of charging member An image forming apparatus is provided with an image bearing member, a charging member with a discharge wire and a grid, and a first current supply controlling member, which controls a current supply to the discharge wire. Also provided are a second current supply c... | 08/07/2007 |
| 7245851 | Electrophotographic apparatus In an electrophotographic apparatus having a blue (purple) semiconductor laser as a light source, the electrophotographic apparatus has an electrophotographic photosensitive member, a charging means, an exposure means, a developing means, a transfer means and a dest... | 07/17/2007 |
| 7242882 | Electric potential measuring device using oscillating device, image forming apparatus, and electric potential measuring method To provide an electric potential measuring device which is useful in realizing size reduction, high sensitivity, and high reliability. The electric potential measuring device includes: an oscillating device which includes torsion springs, and an oscillating body axi... | 07/10/2007 |
