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| Number | Title | Issue Date |
| 4484812 | Electrostatic charging system for electrophotographic copying machine An electrostatic charging system for an electrophotographic copying machine comprises a photoreceptor, electrostatic charger, an a.c. high voltage transformer for driving the electrostatic charger and a photoreceptor current detector. The transformer is e... | 11/27/1984 |
| 4480909 | Potential control on photosensitive member Disclosed herein is an electrophotography process for controlling the potential on a movable photosensitive member having a photoconductive layer to form a latent image on the photosensitive member. The moving speed of the photosensitive member is changed... | 11/06/1984 |
| 4456370 | Charge control system An apparatus which controls the electrical charging of a photoconductive member used in an electrophotographic printing machine. The apparatus has a pair of corona generating devices. The second corona generating device detects the level of charge on the ... | 06/26/1984 |
| 4443095 | Image transfer and sheet separation apparatus for electrophotographic system In an electrophotographic system in which latent images of negative and positive polarities formed electrostatically on a photoconductive member or a dielectric member are successively developed with two different kinds of toners and then transferred onto... | 04/17/1984 |
| 4432631 | Photoconductor charging technique In an electrophotographic copying device having charging, imaging, developing, transferring, precleaning and cleaning facilities, the arrangement being in the conventional sense, but incorporates a combined charging and precleaning unit that is operable t... | 02/21/1984 |
| 4431302 | Charge level control for an electrochargeable medium Apparatus is described for providing controlled corona charging of an electrophotographic member that moves past a corona charging electrode. A corona sensor probe near the charging electrode receives a sample of the corona current flow from the electrode... | 02/14/1984 |
| 4417804 | High voltage comparator for photoreceptor voltage control A photoreceptor voltage control having a comparator circuit for determining the error between the photoreceptor voltage and the desired voltage. The photoreceptor voltage is detected by a non-contacting detector and the photoreceptor voltage signal is fed... | 11/29/1983 |
| 4411514 | Variable magnification electrophotographic copying apparatus An electrophotographic apparatus capable of copying an original selectively at different magnifications includes a movable electrophotographic photosensitive member, an electrostatic discharge device for imparting discharge to the photosensitive member to... | 10/25/1983 |
| 4355885 | Image forming apparatus provided with surface potential control device Image forming apparatus having a surface potential control device incorporated therein, in which magnitude of a measured value of the surface potential sensor and an aimed potential value is discriminated, and an output from an output device such as an ex... | 10/26/1982 |
| 4346986 | Image formation method and apparatus An image forming apparatus includes a plurality of devices for forming an image on a rotatable medium and transferring the image onto transfer material. A detector is provided to detect the electrical condition of one of the devices during an initial turn... | 08/31/1982 |
| 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 |
| 4326796 | Apparatus and method for measuring and maintaining copy quality in an electrophotographic copier Factors affecting copy quality are continuously adjusted during copying in accordance with the actual charge on the photoconductor relative to a fixed reference potential. The photoconductor, carried on a moving, partially exposed, constant potential cond... | 04/27/1982 |
| 4322156 | Charging apparatus for copying machine In an electrostatic copying machine, a charging apparatus for a photoconductive member includes a thermally responsive device for automatically adjusting the distance between the corona charger and the photoconductive member in response to temperature cha... | 03/30/1982 |
| 4286862 | Means for separating a copying paper from a sensitive body in an electronic copying machine This invention relates to means of separating a copying paper from a sensitive body in an electronic copying machine, said means making it easy and sure to separate the former from the latter by controlling variably a voltage for removing electric charges... | 09/01/1981 |
| 4248519 | Charge control system for xerographic machines Apparatus for controlling the charge level on the photoconductive surface of a reproduction machine to enhance imaging. A corona generator is used to initially charge the photoconductive surface following which the charge is examined and compared with a p... | 02/03/1981 |
| 4173407 | Electrophotographic contact duplicating apparatus and method Apparatus in which the photographic images on a strip roll of silver halide film are duplicated upon a strip roll of electrophotographic film. The apparatus feeds the strips of the two rolls into contact with one another, emulsion side of the photographic... | 11/06/1979 |
| 4167325 | Electrographic recording apparatus An improved electrographic recording system. The system includes a first charging corona for providing a distribution of charge on a surface of a recording medium representing a desired image to be recorded on the medium. The system also includes an autom... | 09/11/1979 |
| 4141648 | Photoconductor charging technique A two cycle process electrophotographic copying device having charging, imaging, developing, transferring, and cleaning facilities, the arrangement being in the conventional sense, incorporates a combined charge and preclean corona unit that is operable t... | 02/27/1979 |
| 4105321 | Illuminated charge control system for xerographic machines Apparatus for controlling the charge level on the photoconductive surface of a reproduction machine to enhance imaging. A corona generator is used to initially charge the photoconductive surface following which the charge is examined and compared with a p... | 08/08/1978 |
| 4095890 | Xerographic copying apparatus Development of a charged photoconductive medium in xerographic copying apparatus is prevented when a properly formed charge image is missing as a result of insufficient imagewise exposure, by a system in which the intensity of the exposing illumination is... | 06/20/1978 |
| 4063155 | D.C. Electrometer probe Apparatus to enable potentials applied to various operating components of an electrostatic type reproduction machine to be measured by an electrostatic voltmeter. The apparatus comprises structures designed to place the sensing element of the voltmeter in... | 12/13/1977 |
| 4063154 | D. C. electrometer Feedback circuit for the probe of an d.c. type electrostatic voltmeter to reduce spacing sensitivity thereof. A variable gain amplifier is employed to control the amplitude of the a.c. signal output of a square wave oscillator in response to the potential... | 12/13/1977 |
| 4000944 | Photoreceptor for electrostatic reproduction machines with built-in electrode An electrostatic type copying or reproduction machine incorporating, as an integral, part of the machine photoconductive member, a signal generating electrode for use in controlling one or more of the machine processing parameters.... | 01/04/1977 |
| 3951541 | Duplicator processor Strip film of the conventional silver halide emulsion type is duplicated by optically projecting the images onto a high speed electrophotographic film in a system comprising a flow type camera having the original film and the electrophotographic film trav... | 04/20/1976 |
