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7612570 |
Surface-potential distribution measuring apparatus, image carrier, and image forming apparatus
A surface-potential distribution measuring apparatus includes an electron gun, an electron-beam optical system, an electron-emission panel, a detector, and a control system. The electron-beam...
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7612569 |
Oscillating device, electric potential measuring device, light deflecting device, and image forming apparatus
Oscillating device including a movable member that is vibratable, a fixed section that is provided opposite to the movable member, a driving unit configured to drive the movable member, and at...
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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...
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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...
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7548066 |
Potential measuring device and image forming apparatus using the same
A potential measuring device for measuring a potential of a measurement object, includes a detection electrode that faces the measurement object, a reference electrode disposed in a vicinity of the...
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7504832 |
Electric potential measuring apparatus and image forming apparatus
An electric potential measuring apparatus includes a movable portion having a detecting electrode and a magnetic force receiver, a magnetic force generator, an electric field shield, and a detector...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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7149442 |
Electric potential sensor
An electric potential sensor includes a detecting electrode, a capacitor modulating unit for modulating a coupling capacitance between the detecting electrode and a measurement object by using an...
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7113712 |
Image forming apparatus
A high-precision image control method that can be conducted frequently without time or labor. When a sheet-passing operation starts, maximum exposure is performed at present settings in a...
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7092650 |
Color image forming apparatus
There is disclosed in an IOI system which predicts surface potentials of a photosensitive drum positioned in developing positions of individual developing devices from detection results of the...
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7076181 |
Closed loop control of photoreceptor surface voltage for electrophotographic processes
A method of maintaining a surface charge on a photoreceptor within a predetermined voltage range is provided, comprising the steps of providing a charging device adjacent to a surface of the...
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6987575 |
Printing device which operates with at least three brightness steps and methods to be executed therewith for determining printing parameters
The invention relates to a method for operating an electrophotographic printing device ( 10 ). A multilevel character generator ( 22 ) is used in said printing device ( 10 ). Correction parameters...
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6885833 |
Reduction of banding and mottle in electrophotographic systems
A mechanism and process for detecting mottle or banding in a developed electrophotographic image. Within an electrophotographic reproduction apparatus 10 , a photoconductor is used for receiving...
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6873805 |
Toner replenishment based on writer current
A method and apparatus for replenishing toner based on the electric current used over time by the exposure subsystem. Toner take-out for each image is estimated by measuring the current used by the...
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6845220 |
Development device to detect a developing gap
A development device includes a developing gap detection function. The development device also includes an organic photoconductive body, a developer conveying body, a DC power supply, an AC power...
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6771912 |
Systems and methods for generating photo-induced discharge curves
A real-time photo-induced discharge curve (PIDC) model generator uses a nonliner model structure based on the physics of a xerographic system photoreceptor. The PIDC generator estimates a small...
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6738586 |
Print control method of electrophotograph and image formation apparatus with potential sensor using the method
A print control method of an electrophotograph in an image formation apparatus including at least a photoconductor, a charger, a light exposure unit, and a developing device for forming a...
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6735400 |
Electrophotographic or ionographic printer with variable printing speed
In a printer with an electrically chargeable image drum, such as a laser or a LED printer, for imprinting a medium by transferring toner to the medium, including, arranged around the image drum, a...
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6647219 |
Electrophotographic recording process control method and apparatus
The surface of an electrostatic recording member in an electrophotographic recording apparatus is charged to a standard primary charge V 0s . The standard primary charge on the recording member is...
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6628903 |
Image forming apparatus having a sensor for sensing an amount of reflected light from both a photoconductive element and a paper
An image forming apparatus with a sensing control system having an optical sensor and a control device. A detected object is recognized by using the difference of an output characteristics...
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6591071 |
Image forming apparatus capable of correcting control coefficient used to determine electrification bias
In a method for forming an image, an electrification device electrifies an image bearing member to a predetermined potential. An exposure device exposes the electrified image bearing member. A...
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6538678 |
Image forming apparatus with development controller
A high quality image forming apparatus capable of outputting a quality image at a high speed is provided, with which no unevenness is generated on an image and a fog or a change in density is less...
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6529223 |
Image forming apparatus with light beam control
An object of the present invention is to provide an image forming apparatus that has an image bearing body, charging device for charging the image bearing body, and exposing device for exposing the...
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6516161 |
Image forming apparatus with surface potential detector
An image forming apparatus includes an image bearing member and an image formation unit for forming an image on the image bearing member. The image formation unit is provided with a charger for...
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6498908 |
Electrophotographic measurement system
A first embodiment of a measurement system provides an indication of performance of an electrophotographic process. The first embodiment includes a charge measurement device coupled to a developing...
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6493524 |
Image forming apparatus
An image forming apparatus includes an image bearing member, an image forming unit for forming an image on the image bearing member and a detector for detecting the surface potential of the image...
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6477338 |
Image formation apparatus, toner amount measurement apparatus, and toner amount measurement method
Light is applied by a laser diode 121 onto a photosensitive roll 110 formed with a developed toner image 161, the surface potential of the photosensitive roll 110 to which the light is...
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6381426 |
Automatic gain control for electrostatic voltmeters
Method and apparatus for controlling amplifier gain, e.g., as used in ESV of a xerographic copier, has a light source, e.g., an LED, optically coupled to a gain control light dependent resistor...
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6321043 |
Control of halftone and solid area image quality by way of a halftone discharge ratio
In an electrostatic and development control in a printing apparatus, unwanted variation in dot size and shape may be stabilized and the DMA variability under halftone control may be decreased, by...
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6223006 |
Photoreceptor charge control
Photoreceptor charge control for obviating the adverse effects of photoreceptor variation inherent in the photoreceptor as the result of the manufacturing process. The voltage values around the...
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6208820 |
Electrophotographic apparatus having pre-exposure means
The present invention relates to an electrophotographic apparatus in which the apparatus is provided with a sequence in which a dark portion and a light portion are formed on a first portion and a...
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6006047 |
Apparatus for monitoring and controlling electrical parameters of an imaging surface
An apparatus for monitoring and controlling electrical parameter of an imaging surface, the monitoring controlling apparatus including a patch generator for recording a first control patch at a...
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5983043 |
Potential measuring apparatus and potential measuring method
In a surface potential measuring apparatus for measuring a potential configuration by moving a photosensitive body of an image forming apparatus of electrophotographic type and at least one...
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5978627 |
Method and system for measuring sensitivity of electrophotographic photoconductor
A method and system for measuring sensitivity of an electrophotography photoconductor. The sensitivity is determined using changing information of the surface potential of the photoconductor and an...
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5893659 |
Image forming apparatus with transfer current controller and method of forming an image using the same
This invention relates to an image forming apparatus with a transfer unit for transferring toner electrically to an electrostatic latent image formed on a photoreceptor onto a copy sheet. The image...
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5832333 |
Electrostatic recording apparatus and electrostatic recording method
An electrostatic recording apparatus includes a background potential detector (12a, 12b, 13a and 13b) for detecting the potential (VMc) of a background region adjacent to a normal development...
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5805951 |
Image forming apparatus detecting useful life of an image bearing member
An image forming apparatus for detecting the useful life of an image bearing member includes an image bearing member; a charging member contactable to the image bearing member for charging the...
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