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| Number | Title | Issue Date |
| 5367361 | System and method for controlling voltages of elements in an electrostatic printing apparatus A method of controlling voltages in a latent image development printer. A printer controller receives three parameters and determines a substrate charging voltage, a development station bias voltage, and a laser power for discharging the substrate, based ... | 11/22/1994 |
| 5291245 | Photoreceptor belt seam detection and process control An apparatus and method for detecting the seam in a photoreceptor belt is provided. A sensor is positioned on one side of the belt in opposed relationship to a light source which can be a lamp dedicated solely to that purpose or light from an imager such ... | 03/01/1994 |
| 5257075 | Image forming apparatus An image forming apparatus includes an electrophotographic photosensitive member; a light source; a developing device for developing with a developer an electrostatic latent image formed on the photosensitive member by light from the light source, wherein... | 10/26/1993 |
| 5255063 | Color copying apparatus with improved start timing of a scanner A color copying apparatus in accordance with the present invention includes: a scanner for scanning an original to form a plurality of electrostatic latent images corresponding to color components of an image of the original; developing devices for conver... | 10/19/1993 |
| 5250988 | Electrophotographic apparatus having image control means In an electrophotographic apparatus, densities of toner images of a light reference mark and a dark reference mark are detected by a density sensor, and input voltages such as an illumination power source voltage and an electrostatic charge voltage are va... | 10/05/1993 |
| 5233402 | Color image forming apparatus with improved color image registration The color image forming machine such like a color printer or a color copier for forming a color image on a recording sheet. The image forming machine includes a photoreceptor belt; a belt driver for rotating the photoreceptor in a longitudinal direction; ... | 08/03/1993 |
| 5233391 | Image adjusting apparatus having a controlled the voltage applied to the light source thereof An image adjusting apparatus being provided in a copying machine capable of performing a copy of an original by using a photosensitive body in two or more copying modes, includes a unit for sensing a toner density of an image formed on the photosensitive ... | 08/03/1993 |
| 5177532 | Image forming apparatus for adjusting gradation using subsidiary exposure When to perform subsidiary exposure before or after main exposure or concurrently therewith with a quantity of light corresponding to about 1/50 to 1/100 of the quantity of light of main exposure, an image forming apparatus according to the present invent... | 01/05/1993 |
| 5160967 | Image forming apparatus with layer thinning detection An apparatus for forming an image of a document, capable of charging a photoconductor by using a charging device includes a unit for detecting a value of a flowing current into the photoconductor, a unit for comparing the value of the flowing current with... | 11/03/1992 |
| 5159388 | Image forming apparatus An image forming apparatus comprising a charging section for uniformly charging a surface of a photoconductive body; an image forming section for forming an image on the photoconductive body charged by the charging section; a detecting section for detecti... | 10/27/1992 |
| 5150159 | Copying machine capable of providing indexes A copying apparatus has a photoreceptor drum, a charger for charging the photoreceptor drum, an exposure lamp for exposing images to said photoreceptor drum, an apparatus for setting magnification rate of the images, a selector for selecting a first mode ... | 09/22/1992 |
| 5138178 | Photoelectric paper basis weight sensor A non-contact, transmissive energy sensor is utilized for determining the thickness of paper sheets in a feed path. The sensor includes an energy emitting source and an energy detector, the output of the energy detecting source being proportional to the a... | 08/11/1992 |
| 5111309 | Density control system for a digital copier A digital copier having a density control system. The background of the original document is digitally erased based on the density of the background. The image data is separately controlled and not effected by the background erasing process. A manual oper... | 05/05/1992 |
| 5097293 | Method and device for controlling toner density of an electrostatic printing apparatus employing toner In an electrostatic recording apparatus according to the present invention, while a photosensitive drum and a drum cleaner are enabled, but an electrostatic latent image is not formed on the drum and a developing unit is not operated yet, a light emission... | 03/17/1992 |
| 5057864 | Apparatus for controlling the quantity of light of a copying apparatus The present invention relates to an apparatus for controlling the quantity of light of a copying apparatus, and more particularly, to an apparatus for controlling the quantity of light to uniformalize the quantity of central light and the quantity of marg... | 10/15/1991 |
| 4982232 | Exposure control system of image forming apparatus An exposure control system includes (a) a first detecting unit for detecting the original image density of an original document and producing a first signal variable with the detected original image density, (b) a control unit for regulating the quantity ... | 01/01/1991 |
| 4970536 | Apparatus for multicolor image forming wherein image forming conditions are adjusted based on reference images An apparatus having a plurality of developing devices for forming a multiple toner picture image composed of a plurality of layer toner picture images prepared from developed latent picture images formed on an image retainer by turning the image retainer ... | 11/13/1990 |
| 4954846 | Detecting device for detecting the size and/or presence of an original document An original document detecting device includes at least a pair of elements made up of a light emitting element and a light receiving element oppositely arranged on both sides of an original placing platform which is used for placing an original document, ... | 09/04/1990 |
| 4933721 | Image forming apparatus with preconditioning exposure selectively forming a multi-color and mono-color image An image forming apparatus wherein in multi-color mode a multi-color image is formed by repeating a series of uniform charging, image exposing and developing steps to form a plurality of color toner image on a surface of an image retainer, and transferrin... | 06/12/1990 |
| 4920505 | Projection exposure apparatus A projection exposure apparatus for manufacturing semiconductor elements has a control system for correcting changes in imaging characteristics with high precision on a real-time basis and for correcting imaging characteristics of a projecting lens on the... | 04/24/1990 |
| 4916487 | Image forming apparatus An image forming apparatus includes an image forming device for forming an image on a copying paper, an operable input device which is rotatable and is connected with a rotary encoder which outputs a pulse signal in response to rotation of the operatable ... | 04/10/1990 |
| 4860059 | Method of setting color copying conditions A method of setting the copying conditions of a color copying machine includes the steps of scanning a test chart having density patterns in three primary colors, to detect three color components of the light reflected from the test chart, based on which ... | 08/22/1989 |
| 4821068 | Image forming apparatus An image formation apparatus has an image forming section including an optical system for forming an image corresponding to an image of an original, a potential sensor for measuring a surface potential of a photosensitive drum for forming a latent image t... | 04/11/1989 |
| 4816863 | Exposure control system for continuous tone electrophotographic film An exposure control system which permits accurate reproduction of optical density levels on a final image is characterized by a dynamically corrected look-up table. The look-up table is used to calculate each desired exposure intensity level for each imag... | 03/28/1989 |
| 4811047 | Image forming apparatus with means for recognizing an original condition A copying machine has exposure lamps for scanning an original, line sensors for recognizing an original pattern, an imaging lens, a blank exposure lamp to eliminate a black frame and a central black stripe of a reproduced image if the original is thick (i... | 03/07/1989 |
| 4755852 | Exposure control device for a copier An exposure control device for a copier includes a microcomputer which automatically varies the exposure sequentially in a stepwise fashion and the copier performs copying operation in correspondence with the timing of this variation in exposure. The user... | 07/05/1988 |
| 4697910 | Image processor An image-processing apparatus, can function as a copier and also as a printer, has first and second image-forming units, a switching unit and an output unit. When the first image-forming unit is selected by the switching unit, images are formed on a recor... | 10/06/1987 |
| 4674863 | Image forming apparatus controlled by a plurality of image density detectors An improved image forming apparatus for controlling image density at an optimum level. The image forming apparatus has a plurality of detectors for detecting an original image density. The detectors have mutually different detecting characteristics, where... | 06/23/1987 |
| 4619520 | Variable magnification electrophotographic copying apparatus An image forming apparatus includes magnification selector for setting magnification of an image to be formed, an image forming device for forming an image in the magnification set by said magnification selector, automatic density regulator for automatica... | 10/28/1986 |
| 4607943 | Control circuit for an electrostatic copying apparatus An electrostatic copying process and apparatus capable of forming copies in at least two different ratios. The formation of a copied image involves exposure scanning of the image of an original document and projecting it on a photosensitive member through... | 08/26/1986 |
| 4544261 | Charging and exposure section in an electrophotographic apparatus In a charging and exposure section of an electrophotographic apparatus, a charging mask defining a charge area of an electrophotosensitive member charged by a charging unit is formed with a cut-out portion which is not exposed through an objective lens fo... | 10/01/1985 |
| 4544264 | Fine line print enhancement This discloses an electrophotographic printing machine with circuits to enhance the printing of fine lines, such as lines of a single picture element (pel) in width. Provision is made for broadening such lines in one dimension by adding small "black" area... | 10/01/1985 |
| 4536082 | Transfer type electrostatic reproducing apparatus An electrostatic reproducing apparatus wherein a detecting device for toner image density on the charge receptor and an exposure device are provided between the developing device and the charging device, a discharge current of the charging device and/or t... | 08/20/1985 |
| 4519694 | Projection apparatus for automatic correction of non-uniform illuminance distribution in image area of imaging plane The present invention provides an apparatus for projecting the image of an original on the projection surface of a screen or photosensitive member, the apparatus having an illumination correction device for changing a distribution of illuminance on the pr... | 05/28/1985 |
| 4390267 | Bi-modal illumination apparatus Flash lamps operate in two modes depending upon the position of the platen cover of a copier. In the first mode, the platen cover is closed and a short duration relative high-peak intensity flash pulse illuminates a document at the exposure platen. In the... | 06/28/1983 |
| 4372672 | Self-triggering quality control sensor A system for checking copy quality variables within an electrophotographic copier machine involving the production of a developed sample test area and a base reference test area on a photoreceptive surface. An optical transducer is used to view the test a... | 02/08/1983 |
| 4372676 | Electrophotographic copying machine An electrophotographic copying machine of a transfer type has a capability of reproducing an image on a copying paper selectively at a plurality of magnifications and also a capability of feeding copying papers of different sizes. The machine comprises a ... | 02/08/1983 |
| 4335953 | Variable magnification copying apparatus The ratio of the length of the light path between an original to be copied and a lens to the length of the light path between the lens and a photosensitive medium is changed by the copying magnification changing operation. That is, for example, the lens i... | 06/22/1982 |
| 4284344 | Electrophotographic density control A photoreceptor charge control arrangement to be employed for electrophotographic copying apparatuses wherein a specific circumferential portion on a uniformly charged photoreceptor is first exposed by a referenced exposure source to a specific amount of ... | 08/18/1981 |
| 4148581 | Shutter opening and closing mechanism for an electrographic apparatus A shutter opening and closing mechanism for an electrographic apparatus comprising a dark box for surrounding a photosensitive screen and provided with an opening through which light flux reflected from a manuscript image is projected onto the photosensit... | 04/10/1979 |
