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| Number | Title | Issue Date |
| 7043181 | Developing apparatus and method for regulating an AC bias frequency to the developing roller The electrophotographic image formation apparatus of the present invention adopts a developer roller, which is made of aluminum and has an aluminum oxide film of at least 5 μm in thickness formed on surface thereof. In the image formation apparatus, a gap between t... | 05/09/2006 |
| 6243551 | Electrophotographic copying method and apparatus Method and apparatus are presented for electrophotographic copying of original information. One cycle of the copying method consists of the following. An electrostatic image of the copying information is recorded onto a recording photoreceptor, and the re... | 06/05/2001 |
| 6162570 | Electrophotographic printing process for printing a carrier In an electrophotographic printing process as well as an electrophotographic printer for printing a substrate, a photo-sensitive layered system is brought to a homogeneous initial state by impressing an electrical field having a first direction. The photo... | 12/19/2000 |
| 5589920 | Image forming apparatus in which plural transfer media are carried concurrently An image forming apparatus includes an image carrier for carrying an image, and a transfer medium bearing member for bearing and conveying a transfer medium to a transfer unit of said image carrier. The transfer medium bearing member is able to bear multi... | 12/31/1996 |
| 5339150 | Mark detection circuit for an electrographic printing machine An apparatus and method of adjusting an imager in an electrophotographic printing machine to correct for registration errors when forming a composite image. Registration errors are sensed by forming one or more target lines on the photoreceptor surface, d... | 08/16/1994 |
| 5130214 | Method for producing electrophotographic photoreceptor and apparatus used therefor Disclosed is a method for producing an electrophotographic photoreceptor capable of repeated copying without one imagewise exposure for every one copying and which is superior in stability, sensitivity, resolution and tone reproduction. This method compri... | 07/14/1992 |
| 5111242 | Image forming apparatus having a more smoothly controlled image forming element An image forming apparatus for producing a visible image on an image forming medium includes a photosensitive drum for carrying a latent image thereon, a developer for developing the latent image to form a developed image on the photosensitive drum, and a... | 05/05/1992 |
| 4992831 | Image forming apparatus with plural developing devices In an image forming apparatus having two developers, toner deposition parameters in the second developing device are larger than the first developing device. Here, the toner deposition parameter is represented by an amount of electric charge of the toner ... | 02/12/1991 |
| 4806972 | Printer A printer according to this invention comprises a latent image supporter having an endless belt shape and provided with separate image-forming regions, and a developing unit capable of independently supplying toners of different colors onto latent images ... | 02/21/1989 |
| 4688927 | Electrophotographic copying machine An electrophotographic copying machine capable of producing successively a plurality of identical copies from one electrostatic latent image formed on a photoreceptor carrier, which machine comprises a charge eraser for preventing an electrostatic dischar... | 08/25/1987 |
| 4669861 | Electrophotographic recording apparatus An electrophotographic recording apparatus which repeats the development of an electrostatic latent image corresponding to the original, which is formed once on an image supporting means, with a toner and the succeeding transfer of the resulting toner ima... | 06/02/1987 |
| 4664499 | Electrostatic duplicator for multicolor imagery An electrostatic duplicator for forming color composite images and employing preformed electrostatic masters (color separated fixed toner images). The duplicator has a drum including four flat sides for mounting respective ones of the masters (4). The res... | 05/12/1987 |
| 4643559 | Electrophotographic copying method There is disclosed an electrophotographic copying method applicable to an electrophotographic copying machine providing a photo-sensitive drum (hereinafter referred to as a first drum) and a drum capable of being brought into contact with or being separat... | 02/17/1987 |
| 4583489 | Method for making duplicate xeroradiographic images A xerographic system which makes two, or more, copies for each exposure by developing the image twice. This can be done by either providing two developing, drying and transfer stations within the system, or by reversing the direction of the exposed plate ... | 04/22/1986 |
| 4559509 | Electrophotographic copying apparatus including electrically biased transfer station and method There is disclosed herein an electrophotographic copying apparatus and its method of operation in which electrically charged toner of one polarity is transferred from an oppositely charged electrostatic image on the outer surface of its photoconductive dr... | 12/17/1985 |
| 4531827 | Method and apparatus for improved retention copying A method of producing multiple copies of an original document with a minimum number of document imaging scannings includes impressing an electrostatic image of a reference density patch on the charge receptor together with an image of the document, detect... | 07/30/1985 |
| 4511236 | Electrophotographic process A photosensitive member in the form of a belt moves along an arcuate path, and during such movement, it is slitwise exposed to a light image of an original. A developing step and a transfer step, which transfers a visual image obtained by the developing s... | 04/16/1985 |
| 4443093 | Electrostatic printing method In an electrostatic printing method of the type wherein a toner image is fixed on a printing master, the master is repeatedly run through a charging operation with a discharging lamp or the like maintained off, until the potential thereof reaches a value ... | 04/17/1984 |
| 4416531 | Electrophotographic copying apparatus and subsystems therefor An electrophotographic copying apparatus includes a photosensitive surface capable of retaining an electrostatic latent image for at least two cycles of the surface so a first copy of an original can be made upon scanning the original and the latent image... | 11/22/1983 |
| 4401383 | Transfer device for use in retention type electrophotographic copying machine In a transfer roller for use in a retention type copying machine, a semiconductive transfer roller is connected through a current limiting resistor having a high resistance value of 100 MΩ to 1000 MΩ to a transferring bias voltage source. A pair of auxi... | 08/30/1983 |
| 4392737 | Electrophotographic copying apparatus An electrophotographic copying apparatus comprises a photosensitive member which includes a conductive layer carrying a sequential lamination of a first photoconductive layer which is sensitive to visible light and a second photoconductive layer which is ... | 07/12/1983 |
| 4391502 | Electrophotographic apparatus having means for adjusting the reproduction properties of subsequent copies after a first copy has been produced An electrophotographic process for forming or printing one or more duplicated copies of an original document comprises a step for subjecting a uniformly charged photosensitive member such as a photoconductive drum and a photoconductive screen drum to an imagew... | 07/05/1983 |
| 4381147 | Apparatus for forming plural images from a latent image In the conventional electrophotographic apparatus, the formation of plural images on transfer materials from an original has been achieved by forming a latent image anew on a latent image bearing member for each image to be obtained. Such repeated latent ... | 04/26/1983 |
| 4365885 | Apparatus for removing unnecessary charges on a photosensitive member in an electrophotographic system In an electrophotographic apparatus where charges retained on a photosensitive member, which is generally, photoconductive member, are discharged and erased by illuminating the light emitted from an illuminating device on the photosensitive member. The un... | 12/28/1982 |
| 4354756 | Copying apparatus A copying apparatus and method in which a single image of an original is utilized to form plural copies without degradation of the copy quality. A single rotatable drum is provided which has first and second photosensitive surfaces formed thereon. The ima... | 10/19/1982 |
| 4352549 | Electrophotographic copying method and apparatus An electrophotographic copying method and apparatus in which a powder image of an original document is transferred from the photoconductor to a receiving member. Thereafter, an electrostatic latent image of this transferred powder image is formed back ont... | 10/05/1982 |
| 4338017 | Electrophotographic apparatus An electrophotographic apparatus comprising a photosensitive drum applied with a main transfer bias voltage which is adjustable and a transfer roller applied with an auxiliary transfer bias voltage which is also adjustable.... | 07/06/1982 |
| 4334772 | Electrophotographic apparatus of retentive type An electrophotographic apparatus of the retention type for forming a number of copies from the same and single electrostatic charge image once formed on a photosensitive drum by repeating successively developing and transferring operations. The electropho... | 06/15/1982 |
| 4329043 | Multiple copy electrophotographic reproducing apparatus Apparatus for obtaining multiple copies from apparatus including an electrophotographic member of the type in which the latent image is represented by charge not removed when toner is applied and thereafter transferred. The electrophotographic member with... | 05/11/1982 |
| 4325625 | Electrophotographing method An electrophotographing method for use in a copying apparatus employing a sensitizing screen having a great number of fine apertures, made in a drum shape, and a transferring means having a conductive base plate and a charge storage layer formed on the ba... | 04/20/1982 |
| 4298278 | Device for detachably attaching a master sheet to a drum In a copying machine having a drum of the type in which a master sheet is detachably attached to the periphery of the drum, the improvement comprising a rotary shaft for supporting the drum, clutch means provided between the drum and a driving member for ... | 11/03/1981 |
| 4286865 | Electrophotographic copying apparatus for the production of multiple copies from a single latent electrostatic image An improved electrophotographic copying apparatus is described, which permits, during automatic copying of a desired number of copies from the same original document, the setting of the number of repeated uses of the same latent electrostatic image, thus ... | 09/01/1981 |
| 4269503 | Toner cleaning apparatus A toner cleaning apparatus for use in an electrophotographic apparatus having a rotatable photosensitive drum, a corona charger for uniformly charging or electrifying the photosensitive drum, an optical system for projecting an image of a document to be d... | 05/26/1981 |
| 4268157 | Toner image transfer method and apparatus for electrostatic photography A photoconductive drum is formed with a photoconductive dielectric layer for producing an electrostatic image and an endless transfer belt is formed with a dielectric layer thereon. A toner substance is applied to the drum to produce a toner image, and a ... | 05/19/1981 |
| 4257700 | Electrophotographic apparatus The electrophotographic apparatus for forming one or more copies of a document has a photosensitive drum rotatably arranged for forming an electrostatic charge latent image and a developing device for developing the latent image into a toner image. A tran... | 03/24/1981 |
| 4255041 | Automatic printing apparatus An automatic printer includes an accommodation device for an image forming element which is used in the formation of a master adapted to be repeatedly subjected to a reproduction process, and an optical system for projecting an image of the original onto ... | 03/10/1981 |
| 4244646 | Device and method for producing a number of copies by electrophotographic techniques A device for electrophotographically copying wherein for writing a charge pattern into a suitable photo-conductive layer with differing electron mobility and hole mobility a relatively long wave length of light is used which has a penetration depth compar... | 01/13/1981 |
| 4218129 | Electrophotographic apparatus An electrophotographic apparatus particularly suitable for printing a plurality of duplicated copies from each of a plurality of sheet-like documents comprising a sheet-like document feeding device for feeding the sheet-like document at a constant velocit... | 08/19/1980 |
| 4204730 | Electrophotographic apparatus An electrophotographic apparatus for obtaining a plurality of duplicated copies based on an image-like modulating information formed on a photosensitive member by one exposure comprises a casing having a sheet document copying area and a thick document co... | 05/27/1980 |
| 4172654 | Apparatus for controlling the rotation of a photosensitive drum of an electrophotographic apparatus In an electrophotographic apparatus including a photosensitive screen drum there is produced a rotation signal each time the screen drum rotates one revolution beginning with a second revolution and the drum is stopped by an nth rotation signal... | 10/30/1979 |
