Charging Simultaneous With Imaging Patents (Class 430/55)
  • Publication number: 20140113224
    Abstract: A method for forming an electrophotographic image is provided which exhibits high toner transfer efficiency without image defects caused by scratches on a photoreceptor and image blurring under high-humidity conditions. The method for forming an electrophotographic image uses an organic photoreceptor and includes a charging step, exposing step, developing step, transferring step and cleaning step. The organic photoreceptor has a photosensitive layer and a protective layer on an electrically conductive support. The protective layer contains a resin prepared by polymerization of a polymerizable compound, a particulate metal oxide, and a compound represented by a formula (1). The developing step uses a toner containing a silica particle having a number-average primary particle diameter of 70 to 150 nm. The formula (1) is: where R1, R2, R3, and R4 may be same or different and each represents a hydrogen atom or an alkyl group.
    Type: Application
    Filed: September 17, 2013
    Publication date: April 24, 2014
    Applicant: Konica Minolta , Inc.
    Inventors: Toshiyuki FUJITA, Mari KONISHI
  • Patent number: 8350239
    Abstract: Exemplary embodiments provide materials and methods for a pen that can include a writing end for writing an image on an erasable medium and an erasing end for locally erasing an image from the erasable medium.
    Type: Grant
    Filed: October 5, 2009
    Date of Patent: January 8, 2013
    Assignee: Xerox Corporation
    Inventors: Bryan J. Roof, Anthony S. Condello
  • Patent number: 7867672
    Abstract: An image forming medium includes a substrate; an imaging layer including an imaging material coated on said substrate, wherein the imaging material exhibits a reversible transition between a colorless state and a colored state; and a protective layer over the imaging layer, the protection layer including dipolar molecules that can be reversibly switch between a UV light transmission state and a UV light absorption state, wherein the dipolar molecules in their random orientation absorb in substantially the same spectral region as the imaging material in its un-imaged state, and wherein the imaging layer is imageable by ultraviolet light when the dipolar molecules are in the UV light transmission state, but the imaging layer is substantially not imageable by ultraviolet light when the dipolar molecules are in the UV light absorption state.
    Type: Grant
    Filed: June 13, 2007
    Date of Patent: January 11, 2011
    Assignee: Xerox Corporation
    Inventors: Gabriel Iftime, Hadi K. Mahabadi, Peter M. Kazmaier
  • Patent number: 7534966
    Abstract: A printed circuit board (PCB) edge connection structure formed by a first PCB having one or more electronic components and printed circuitry provided thereon and a second PCB, having one or more edge contact pads provided thereon, attached to the first PCB and covering an area on the first PCB into which a portion of the printed circuitry extends. The resulting structure maximizes the utilization of the surface area on the first PCB for printed circuitry, thus, reducing the overall size of the end product.
    Type: Grant
    Filed: June 12, 2007
    Date of Patent: May 19, 2009
    Assignee: Clear Electronics, Inc.
    Inventor: Seong Bean Cho
  • Publication number: 20080311496
    Abstract: An image forming medium includes a substrate; an imaging layer including an imaging material coated on said substrate, wherein the imaging material exhibits a reversible transition between a colorless state and a colored state; and a protective layer over the imaging layer, the protection layer including dipolar molecules that can be reversibly switch between a UV light transmission state and a UV light absorption state, wherein the dipolar molecules in their random orientation absorb in substantially the same spectral region as the imaging material in its un-imaged state, and wherein the imaging layer is imageable by ultraviolet light when the dipolar molecules are in the UV light transmission state, but the imaging layer is substantially not imageable by ultraviolet light when the dipolar molecules are in the UV light absorption state.
    Type: Application
    Filed: June 13, 2007
    Publication date: December 18, 2008
    Applicant: XEROX CORPORATION
    Inventors: Gabriel IFTIME, Hadi K. MAHABADI, Peter M. KAZMAIER
  • Patent number: 7432028
    Abstract: This invention relates to a novel organophotoreceptor that includes: (a) a charge transport composition comprising molecules having the formula where n is an average of a distribution of integers generally between 2 and 50,000, and in which n is at least 2; R1, R2, R3, and R4 comprise, each independently, H, an alkyl group, an alkenyl group, a heterocyclic group, or an aromatic group; X comprises an (N,N-disubstituted)arylamine group; and Y is a bridging group; (b) a charge generating compound; and (c) an electrically conductive substrate over which the charge transport composition and the charge generating compound are located.
    Type: Grant
    Filed: February 4, 2004
    Date of Patent: October 7, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Vytautas Getautis, Tadas Malinauskas, Juozas V. Grazulevicius, Valentas Gaidelis, Vygintas Jankauskas, Zbigniew Tokarski, Nusrallah Jubran, Kam W. Law
  • Publication number: 20070298339
    Abstract: An objective is to provide a highly durable carrier for a developer which is capable of forming a high-definition image stably with no deterioration of a developing property since the carrier resistance and the charging ability remain stable even though the developer is used for a long duration; a method of manufacturing the carrier; and an image forming method employing the same. Disclosed is an electrophotographic carrier comprising a carrier core material and provided thereon, a resin-coated layer comprising charge control particles and low-resistive particles, wherein an initial carrier resistance is 5×108-3×1010 ?cm; a concentration of the low-resistive particles grows higher toward a surface of the layer from an inner part of the layer; and a concentration of the charge control particles grows lower toward a surface of the layer from an inner part of the layer.
    Type: Application
    Filed: May 31, 2007
    Publication date: December 27, 2007
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Hiroyuki KOZURU, Yoshiaki KOBAYASHI, Tatsuya NAGASE
  • Patent number: 7271288
    Abstract: Disclosed is an aromatic compound expressed by the general formula (I), wherein A represents of a fused aromatic hydrocarbon moiety such as triphenylene, X represents a hydrogen-bonding site such as an atomic group containing an amide linkage, Y represents a chain functional group such as an alkyl group having 3 to 18, preferably 10 to 18 carbon atoms, and n represents an integer ranging from 2 to 10. The aromatic compound forms a molecular assembly in which the aromatic rings mutually overlap and exhibits an excellent charge carrier transfer property AX—Y)n.
    Type: Grant
    Filed: December 11, 2003
    Date of Patent: September 18, 2007
    Assignee: Kyushu University, National University Corporation
    Inventors: Masayuki Takeuchi, Masato Ikeda, Seiji Shinkai
  • Patent number: 7046311
    Abstract: An a.c. driving system photo-writing type recording medium having a substrate formed an electrode layer on one side thereof, a transparent substrate formed a transparent electrode layer on one side thereof, an optical switching layer having a pair of charge generation layers each including a charge generation material; and a charge transport layer including a charge transport material, disposed between the pair of charge generation layers, and a display element layer, in which the electrode layer of the substrate and the transparent electrode layer of the transparent substrate are opposed to each other, and the following equation (1) is satisfied |Ipcgl?Ipctl|?0.5 eV??(1) where Ipcgl is an ionization potential of the charge generation material and Ipctl is an ionization potential of the charge transport material.
    Type: Grant
    Filed: March 11, 2002
    Date of Patent: May 16, 2006
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Hideo Kobayashi, Takehito Hikichi
  • Patent number: 6800410
    Abstract: An image forming apparatus has at least a photoconductor, a charger, and an irradiator for irradiating a light for optically writing in on the photoconductor to form a latent electrostatic image using a process for electrophotography in which a resolution of the optical writing in operation is 1200 dpi or more. Further, the optical writing operation is performed using a laser beam having a diameter of 35 &mgr;m or less. The photoconductor is provided with at least a charge generating layer containing a charge generating substance and a charge transporting layer containing a charge transporting substance. The charge transporting layer has a carrier mobility of 1×10−5 cm2·V−1·sec−1 or more under an electric field of 3×105 V·cm−1.
    Type: Grant
    Filed: October 1, 2002
    Date of Patent: October 5, 2004
    Assignee: Ricoh Company, Ltd.
    Inventors: Kei Yasutomi, Yasuo Suzuki, Nozomu Tamoto
  • Publication number: 20020168198
    Abstract: In a solid state radiation detector, an electrode layer, to which an electromagnetic wave for retrieval is irradiated, is formed by alternately arranging a first stripe electrode for transmitting the electromagnetic wave for retrieval and a second stripe electrode for shielding the same. Upon recording a radiation image, discharge breakdown of the first and the second stripe electrodes owing to application of a direct-current voltage is avoided.
    Type: Application
    Filed: May 13, 2002
    Publication date: November 14, 2002
    Applicant: FUJI PHOTO FILM CO., LTD.
    Inventor: Shinji Imai
  • Publication number: 20020160286
    Abstract: 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 recording photoreceptor is used to form a latent electrostatic image on an intermediate information carrier. The latent electrostatic image is developed on the intermediate information carrier, and the developed image is transferred onto a final information carrier. The intermediate information carrier is a photoreceptor of a kind capable of, when being charged, storing the charge during a period of time required for producing a desired number of copies.
    Type: Application
    Filed: June 4, 2001
    Publication date: October 31, 2002
    Applicant: Elfotek Ltd.
    Inventor: Genadi Berlin
  • Patent number: 6440625
    Abstract: A method of electrostatic recording on a cylindrical photoreceptor with a dielectric coating of a photosemiconductor layer is presented. The method includes such main operational steps as charging, exposure and illumination of the photoreceptor, wherein the exposure is carried out by means of optical image scanning along a helix line. This method provides for use of the electrophotography for production of PCBs and printing matrices.
    Type: Grant
    Filed: January 13, 2000
    Date of Patent: August 27, 2002
    Assignee: Elfotek Ltd.
    Inventor: Genady Berlin
  • Publication number: 20020027647
    Abstract: The present invention overcomes many of the disadvantages of prior lithographic microfabrication processes while providing further improvements that can significantly enhance the ability to make more complicated semiconductor chips at lower cost. A new type of programmable structure for exposing a wafer allows the lithographic pattern to be changed under electronic control. This provides great flexibility, increasing the throughput and decreasing the cost of chip manufacture and providing numerous other advantages. The programmable structure consists of an array of shutters that can be programmed to either transmit light to the wafer (referred to as its “open” state) or not transmit light to the wafer (referred to as its “closed” state). The programmable structure can comprise or include an array of selective amplifiers.
    Type: Application
    Filed: June 4, 2001
    Publication date: March 7, 2002
    Applicant: Pixelligent Technologies LLC.
    Inventors: Gregory D. Cooper, Richard M. Mohring
  • Patent number: 6162570
    Abstract: 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 photoconductive layer is exposed with predetermined image structures according to the image. The entire photoconductive layer is exposed uniformly through the cover layer and/or the electrode layer. Charged toner particles are applied to the cover layer in a development step. The toner image is then transferred to the substrate. If more than one copy is required, the development step and the transfer step are carried out a number of times, the electrical charge image present inside the layered system being retained. The substrate is conveyed at a very high speed by a conveyor device in this operational state.
    Type: Grant
    Filed: November 24, 1998
    Date of Patent: December 19, 2000
    Assignee: Oce Printing Systems GmbH
    Inventors: Volkhard Maess, Martin Schleusener
  • Patent number: 5879846
    Abstract: A developing agent comprises an insulative toner and a conductive carrier, and the tensile rupture stress of the insulative toner powder layer is 0.1-1 g wt/cm.sup.2. The insulative toner used is insulative magnetic toner to which hydrophobically treated inorganic particles and conductive particles have been externally added.
    Type: Grant
    Filed: June 13, 1996
    Date of Patent: March 9, 1999
    Assignee: Fujitsu Limited
    Inventors: Tsuneo Watanuki, Satoshi Takezawa, Makoto Fukuda, Toru Takahashi, Norio Sawatari
  • Patent number: 5635323
    Abstract: A toner used meets the requirement that the value determined by the equation 6/(d.sub.t .multidot..rho..sub.t .multidot.S), wherein d.sub.t is the volume average particle diameter of the toner, .rho..sub.t is the density of the toner, and Fs is the specific surface area of the toner, is in the range of 0.75 to 0.90, and the amount of electrification as measured by a magnet blow-off method is in the range of 10 to 40 .mu.C/g in terms of absolute value. A carrier used meets the requirement that the magnetic susceptibility is not less than 90 emu/g (at 1 kOe), the specific surface area is not less than 1000 cm.sup.2 /g to 1800 cm.sup.2 /g, the electric resistivity is 10.sup.6 to 10.sup.12 .OMEGA.cm, and the average particle diameter is 20 to 100 .mu.m.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: June 3, 1997
    Assignee: Fujitsu Limited
    Inventors: Yasushige Nakamura, Norio Sawatari, Tsuneo Watanuki, Fumio Takei, Toru Takahashi, Yasuyuki Furuse
  • Patent number: 5626997
    Abstract: In an electrophotographic process including an image forming process comprising a charging step of bringing a conductive charging member into contact with a surface of a photoreceptor and applying a superimposed voltage of a direct current voltage and an alternating current voltage to said conductive charging member to directly charge the surface of the photoreceptor, an image exposing step, and a developing step, the application of the voltage to said conductive charging member is stopped for every cycle of the image forming process, whereby the wear of the photoreceptive layer can be reduced and the life of the photoreceptor can be extremely improved.
    Type: Grant
    Filed: March 1, 1995
    Date of Patent: May 6, 1997
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Kiyokazu Mashimo, Fumio Ojima, Tomozumi Uesaka, Tomoo Kobayashi, Toru Ishii
  • Patent number: 5571646
    Abstract: The present invention provides an electrostatic information-recording medium including an electrode layer (13) and a charge-retaining layer, in which said charge-retaining layer is formed of a laminate of a resin layer (11a) having a low glass transition temperature with a heat-resistant, insulating layer (11b), or an electrostatic information-recording medium comprising at least an electrode layer (13) and a charge-retaining layer (11) in which said charge-retaining layer (11) is formed of a polymer layer (12) containing pentafluorostyrene as a monomer component and having a weight-average molecular weight of 10,000 to 2,000,000, or which includes a photoconductive layer (44) and a charge-retaining layer (43) between a pair of electrodes (42) and (45) and is designed to carry out exposure with the application of voltage between both said electrodes (42) and (45) or apply voltage between both said electrodes (42) and (45) while exposure is carried out, thereby forming an electrostatic latent image, which is t
    Type: Grant
    Filed: November 17, 1995
    Date of Patent: November 5, 1996
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Minoru Utsumi, Hiroyuki Obata, Seiji Take, Masayuki Iijima, Hironori Kamiyama
  • Patent number: 5567556
    Abstract: An electrophotographic process in which image information exposure step and a developing step are substantially simultaneously carried out to opposite sides of a photosensitive member includes preparing an electrophotographic photosensitive member having a conductive base layer transmitting light and a photosensitive layer thereon; exposing the conductive base side of the photosensitive member to light information; rubbing an opposite side of the photosensitive member with a developer supplied with a developing bias voltage of the same polarity as the polarity of the developer in a region including an upstream side end a downstream side of an image exposure region of the photosensitive member; wherein an absolute value of a sum of a triboelectric charge potential provided on a surface of the photosensitive member by rubbing between the developer and the photosensitive member, and a surface potential of the photosensitive member provided by application of the developing bias upstream of the image exposure regi
    Type: Grant
    Filed: June 10, 1994
    Date of Patent: October 22, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideyuki Yano, Junji Araya, Osamu Iwasaki
  • Patent number: 5492783
    Abstract: The present invention provides an electrostatic information-recording medium including an electrode layer (13) and a charge-retaining layer, in which said charge-retaining layer is formed of a laminate of a resin layer (11a) having a low glass transition temperature with a heat-resistant, insulating layer (11b), or an electrostatic information-recording medium comprising at least an electrode layer (13) and a charge-retaining layer (11) in which said charge-retaining layer (11) is formed of a polymer layer (12) containing pentafluorostyrene as a monomer component and having a weight-average molecular weight of 10,000 to 2,000,000, or which includes a photoconductive layer (44) and a charge-retaining layer (43) between a pair of electrodes (42) and (45) and is designed to carry out exposure with the application of voltage between both said electrodes (42) and (45) or apply voltage between both said electrodes (42) and (45) while exposure is carried out, thereby forming an electrostatic latent image, which is t
    Type: Grant
    Filed: September 24, 1993
    Date of Patent: February 20, 1996
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Minoru Utsumi, Hiroyuki Obata, Seiji Take, Masayuki Iijima, Hironori Kamiyama
  • Patent number: 5424156
    Abstract: An electrostatic information recording medium according to this invention includes an inorganic oxide layer 3 and a photoconductive layer comprising a charge-generating layer 4 and a charge-transport layer 5 laminated onto an electrode 2 in this sequence, as illustrated in FIG. 1. To record information, the information is exposed to light while voltage is being applied between the electrode 3 and another opposite electrode, or alternatively voltage is applied therebetween while the information is being exposed to light.After information recording, the electrostatic information recording medium is uniformly electrified on its surface as by corona charging, whereby the information can be easily reproduced in the form of electrostatic information. This recording medium, if tone-developed, can be used as an original plate for electrostatic printing.
    Type: Grant
    Filed: March 5, 1992
    Date of Patent: June 13, 1995
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Daigo Aoki, Minoru Utsumi, Hiroyuki Obata
  • Patent number: 5342717
    Abstract: A direct contact type charging component for use in electrophotographic process containing a protective surface layer which comprises a polyether-ester-amide block copolymer. The copolymer is environmentally stably having a volume resistivity between 10.sup.6 Ohm-cm and 10.sup.12 Ohm-cm and a Shore hardness between Shore D 5 and Shore D 90. During the electrophotographic process, a voltage is applied externally to the charging component to cause a charged component, which typically comprises a photo-conductive drum, to become electrostatically charged. In the preferred embodiment, the voltage consists of a direct voltage of .+-.200 to .+-.2,000 V overlapped with an alternating voltage having a peak-to-peak voltage of 4,000 V.
    Type: Grant
    Filed: February 3, 1993
    Date of Patent: August 30, 1994
    Assignee: Industrial Technology Research Institute
    Inventors: Der-Tarng Su, Wen-Jer Chen, Jeng-Yue Wu, Ming-Chu Wu
  • Patent number: 5308724
    Abstract: There is provided a photosensitive medium for recording a charge latent image, composed of a photo-conductive layer having an electrode and a protective layer at each surface thereof. There is further provided a charge latent image recording method. A photo-conductive layer and a charge holding layer, each having an electrode at a surface thereof, are arranged to face each other through a gap. A predetermined voltage is applied across the photo-conductive layer and the charge holding layer through the electrodes to cause discharge thereacross. At the time, an electro-magnetic wave corresponding to the charge latent image intended to be recorded is emitted to the photo-conductive layer. The impedance of the photo-conductive layer is thus varied to record the charge latent image on the charge holding layer.
    Type: Grant
    Filed: April 14, 1992
    Date of Patent: May 3, 1994
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Itsuo Takanashi, Shintaro Nakagaki, Hirohiko Shinonaga, Tsutou Asakura, Masato Furuya, Tetsuji Suzuki
  • Patent number: 5240814
    Abstract: A non-electroscopic prolonged tack toner for transferring toned images to an image receptor at low temperatures with improved back transfer characteristics.
    Type: Grant
    Filed: February 27, 1991
    Date of Patent: August 31, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Robert P. Held
  • Patent number: 5241276
    Abstract: In a system for measuring a surface potential of a sample, a probe is located above. A surface of the sample with a small gap and is vibrated by a piezoelectronic element which is energized by a oscillator. A potential of the distal end of the probe is changed and is converted into an electrical signal. The surface potential is obtained from the electrical signal.
    Type: Grant
    Filed: July 17, 1992
    Date of Patent: August 31, 1993
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kuniyoshi Tanaka, Shunji Shirouzu, Minoru Ohta, Hideo Miyagawa
  • Patent number: 5171652
    Abstract: In forming an image by the simultaneous light exposure-transfer process using a photosensitive toner, a light-exposed electricity-removed toner is effectively scraped without bad influences on the image density, and the fog density is drastically reduced.In subjecting a photosensitive toner layer to imagewise light exposure to form a combination of an electricity-removed toner and a charged toner and removing the electricity-removed toner from an electroconductive substrate by contact with a magnetic brush, the flux density distribution of a main developing pole in a developing sleeve is set so that a two-peak flux density distribution having two peaks separated on the upstream side and downstream side with the vicinity of the nip position between the developing sleeve and electroconductive substrate being as the center is produced in the tangential direction and the value of the peak on the downstream side is smaller than the value of the peak on the upstream side.
    Type: Grant
    Filed: March 19, 1991
    Date of Patent: December 15, 1992
    Assignee: Mita Industrial Co., Ltd.
    Inventor: Yosinobu Umetani
  • Patent number: 5132627
    Abstract: A process is disclosed for ascertaining electrical discharge properties of an electrophotographic imaging member including the steps of (a) providing at least one electrophotographic imaging member comprising an electrically conductive layer and at least one photoconductive layer, (b) contacting the surface of the electrophotographic imaging member with a substantially transparent electrode and applying an electric potential or an electric current to form an electric field across the photoconductive layer, (c) terminating the applying of the electric potential or the electric current, (d) exposing the photoconductive layer to activating radiation to discharge the electrophotographic imaging member, (e) repeating steps (b), (c) and (d), and (f) measuring the potential across the photoconductive layer during steps (b), (c) and (d) as a function of time by means of an electrostatic meter coupled to the electrode.
    Type: Grant
    Filed: December 28, 1990
    Date of Patent: July 21, 1992
    Assignee: Xerox Corporation
    Inventors: Zoran D. Popovic, Damodar M. Pai, Merlin E. Scharfe, Satchidanand Mishra, Edward A. Domm
  • Patent number: 5124218
    Abstract: A photoconductor element is provided that has non-blurring latent image keeping memory which is suitable for multiple electrophotographic copying from a single imaging step. The element preferably incorporates a charge generation layer which comprises a phthalocyanine dye or pigment. The copying method involves simultaneous application of corona charge and an image exposure to the element followed by uniform irradiation of the element. Thereafter a plurality of copies can be made by the step sequence of toner deposition, toner transfer, and toner heat fusion to a receiver.
    Type: Grant
    Filed: July 15, 1991
    Date of Patent: June 23, 1992
    Assignee: Eastman Kodak Company
    Inventors: William Mey, Susan E. Riblett, Orville C. Rodenberg
  • Patent number: 5112710
    Abstract: An electrophotographic image forming member for forming color images including an organic photosensitive layer sandwiched between a dielectric layer and a conductive layer. The photoconductive layer includes a first charge generation layer adjacent to the conductive layer, a charge transfer layer on the first charge generation layer and a second charge generation layer on the charge transfer layer. During exposure, resistance of the photosensitive layer is reduced so that charges can flow through the photosensitive layer to create oppositely charged portions of the image forming member corresponding to a desired image of each color. Appropriately charged color toner adheres to the surface of the image forming member in the form of the desired image. After each color toner image is formed, the completed color image is transferred to a transfer medium.
    Type: Grant
    Filed: January 28, 1991
    Date of Patent: May 12, 1992
    Assignee: Seiko Epson Corporation
    Inventors: Hidetsugu Shimura, Hiroshi Ito
  • Patent number: 5091291
    Abstract: A coupler having as a coupling-off group an alkyl group substituted with an electron source capable of stabilizing carbonium ion.
    Type: Grant
    Filed: October 25, 1990
    Date of Patent: February 25, 1992
    Assignee: Eastman Kodak Company
    Inventors: Philip T. S. Lau, Danny R. Thompson
  • Patent number: 4950570
    Abstract: Disclosed in an image-forming process which comprises arranging two electrode surfaces, at least one having a curvature face and at least the other being transparent, to confront each other, forming a layer of a photosensitive toner on one of the electrode surfaces, applying a bias voltage so that the polarity of the toner layer-supporting electrode surface is the same as the polarity of charges on the toner and the polarity of the confronting electrode surface is reverse to the polarity of charges on the toner, irradiating the toner layer with light at a part where both the electrode surfaces are contacted with each other through the photosensitive toner layer, and transferring the unexposed toner toward the confronting electrode surface.
    Type: Grant
    Filed: November 28, 1988
    Date of Patent: August 21, 1990
    Assignee: MITA Industrial Co., Ltd.
    Inventors: Yumiko Sano, Kazuhito Takaoka, Yosinobu Umetani
  • Patent number: 4944959
    Abstract: Disclosed is an electrostatic recording medium comprising an electroconductive support and as formed thereon a dielectric layer containing an insulating resin and a pigment, said dielectric layer carrying a surface static charge of a polarity opposite to that of a charge to be applied for image formation.
    Type: Grant
    Filed: August 28, 1989
    Date of Patent: July 31, 1990
    Assignee: Kanzaki Paper Manufacturing Company, Limited
    Inventors: Hisanori Yagi, Kousuke Hamada, Isamu Nakano, Yoshihiro Nishimura, Hajime Matsubayashi, Hisashi Tani
  • Patent number: 4898797
    Abstract: Disclosed is a method of improving the sharpness of multiple copies made from a single imagewise exposure using an electrostatographic film buffer element having an insulating layer in between a conductive layer and a photoconductive layer, where the element is simultaneously charged and imagewise exposed and then uniformly exposed with light to bury the charges. The improvement consists of performing the uniform exposure with light that is absorbed by the photoconductive layer and does not penetrate through the photoconductive layer to the insulating layer.
    Type: Grant
    Filed: July 18, 1988
    Date of Patent: February 6, 1990
    Assignee: Eastman Kodak Company
    Inventors: William T. Gruenbaum, William Mey, Kelly S. Robinson
  • Patent number: 4789612
    Abstract: A method for forming a color image comprising the following steps is disclosed,(a) uniformly applying a primary charge to a photoreceptor comprised thereon of a conductive substrate, a photoconductive layer and an electrically insulating layer, wherein one of said layers is provided with plural kinds of color separating means being finely divided into units,(b) exposing said photoreceptor to light given from a color original and simultaneously applying secondary charge,(c) uniformly exposing said photoreceptor to a color light capable of passing through at least one kind of said color separating means to form an electrically charged image pattern,(d) developing said electrically charged pattern with a developer comprising a color toner by a developing means to form a toner pattern,(e) repeating said steps (c) and (d) at least once more,(f) transferring said toner pattern onto an image pattern receiving material, provided that the color light and the color toner each different from these in the every previous
    Type: Grant
    Filed: February 24, 1987
    Date of Patent: December 6, 1988
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Satoshi Haneda, Kunihisa Yoshino
  • Patent number: 4756992
    Abstract: A method of producing an electrostatic charge image comprising the sequential steps of: (1) bringing an electrode into proximity with a photoreceptor, the photoreceptor having a dielectric substrate and a photoconductive film intimately bonded to the substrate, the electrode having means to enable an electric field to be applied across the photoreceptor and being adapted to be brought into proximity with the substrate of the photoreceptor along a length of the electrode and charging the photoreceptor with an electrostatic charge of one polarity and projecting an image of a photograph on the receptor, (2) charging the photoreceptor with an electrostatic charge of opposite polarity, and (3) projecting a photographic image of the subject again on the photoreceptor whereby an electrostatic charge image is formed on the photoconductor surface. The invention also resides in apparatus to carry out the method.
    Type: Grant
    Filed: August 15, 1986
    Date of Patent: July 12, 1988
    Inventor: Stephen Po-Ming Cheng
  • Patent number: 4721662
    Abstract: An image forming method of repeating a whole-surface exposure of a specified light and a development for a photosensitive member having a color separating function. The quantity of light of the whole-surface exposure L is expressed by the following formula for a light quantity L.sub.0 indicating that the potential generated by the whole-surface exposure is saturated:0.7L.sub.0 .ltoreq.L.ltoreq.5L.sub.0.
    Type: Grant
    Filed: October 23, 1986
    Date of Patent: January 26, 1988
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventor: Satoshi Haneda
  • Patent number: 4702979
    Abstract: This invention relates to a method of forming an image, characterized by applying voltage on a photosensitive material having a photoconductive layer and an electroconductive layer on a substrate in such a manner as to make said electroconductive layer positive and said photoconductive layer negative while irradiating optical information on said positive electroconductive layer or said negative photoconductive layer, thereby causing an anodic ion reaction on the interface between said electroconductive layer and said photoconductive layer to selectively change the spectral absorption properties of at least one of said electroconductive layer and said photoconductive layer depending on the irradiated optical information; said photosensitive material comprising an electroconductive layer of metal as a simple substance, its alloy or its metal compound applied on a substrate and a photoconductive layer overlaid on said electroconductive layer.
    Type: Grant
    Filed: July 24, 1986
    Date of Patent: October 27, 1987
    Assignee: Ricoh Co., Ltd.
    Inventors: Satoshi Otomura, Narihito Kojima
  • Patent number: 4696880
    Abstract: A multi-color imaging method wherein a photo-receptor having a photoconductive layer on a conductive member and having on the photoconductive layer an insulating layer comprising a different-color fine-filter distributed layer. The surface of the photo-receptor is image exposed while being changed, then given a flood exposure of specific light to the surface to form a potential pattern on the portion of specific filters and a step to develop the potential pattern is repeated at least twice depending on the type of filter, and a changing process that uniformalizes the potential on the surface is given before the second flood exposure and therewith every time.
    Type: Grant
    Filed: September 4, 1985
    Date of Patent: September 29, 1987
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Hisashi Shoji, Satoshi Haneda, Seiichiro Hiratsuka
  • Patent number: 4668598
    Abstract: A process for providing a direct optical readout of a pattern or collection of data in a plurality of distincitive colors on a dielectric film capable of receiving information by exposure to an electron beam imaging source, which process comprises subjecting said film to a series of separate exposures from an electron beam source, each exposure representing a portion of the overall pattern or collecton of data to be transmitted; treating said film after each exposure intended to distinguish a portion of the overall information with a toner of a distinctive color which combination of colors may be selected for maximum definition and contrast; and separately drying each of said toners on said film before re-exposing said film to said electron beam source for receipt of an additional portion of the pattern or information to be transmitted.
    Type: Grant
    Filed: July 12, 1985
    Date of Patent: May 26, 1987
    Assignee: GAF Corporation
    Inventor: Mark L. Moskowitz
  • Patent number: 4645330
    Abstract: An electrophotographic device is provided with a photosensitive drum having a plurality of photosensitive layers which are different from one another in spectral sensitivity. First and second uniform exposure devices are adjacent to each other about the photosensitive drum. Each of the first and second uniform exposure devices includes a plurality of single color light sources. The light sources of the first exposure device have a different color than the light sources of the second exposure device. The colors correspond to the spectral sensitivity of each of the photosensitive layers, and are used as the uniform exposure light source for the photosensitive drum.
    Type: Grant
    Filed: July 2, 1984
    Date of Patent: February 24, 1987
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Mitsuaki Kohyama, Toshihiro Kasai, Haruhiko Ishida, Takashi Shimazaki
  • Patent number: 4608327
    Abstract: The invention disclosed relates to a method of forming composite images. A photosensitive member including an electroconductive base, a photoconductive layer and an insulation layer in a superposed arrangement is used and to this photosensitive member, a negative image is exposed while simultaneously charging, irradiating with light, charging by an a.c. corona charging means and then exposing a positive image to form a composite electrostatic latent image. If the positive image overlaps with the negative image, the positive image is formed in preference.
    Type: Grant
    Filed: July 17, 1984
    Date of Patent: August 26, 1986
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventor: Tateki Oka
  • Patent number: 4578331
    Abstract: An electrophotographic color image forming process wherein three light beams each representing image information of one of three primary colors or yellow, magenta and cyan of a color document to be recorded obtained by color separation are projected against an electrophotographic photosensitive member to form electrostatic latent images which are developed by toners of the three different colors, respectively, and printed by transfer-printing, to record a color image. The image information of three colors is simultaneously written to a surface of the photosensitive member as three scanning lines either by successively writing a plurality of sets of three scanning lines each representing image information of one color or by writing image information of different colors of the same set separately in three different zones, so that the scanning lines representing image information of different colors form a repeating series of three stripes of different colors.
    Type: Grant
    Filed: July 10, 1984
    Date of Patent: March 25, 1986
    Assignee: Ricoh Company, Ltd.
    Inventors: Itsuo Ikeda, Junji Kurokawa, Mitsuo Hasebe, Seiichi Miyagawa, Hajime Hariu
  • Patent number: 4578332
    Abstract: A method of removing electrostatic charge for erasing an electrostatic latent image from an electrophotographic photosensitive device having a conductive layer overlain by a photoconductive layer which in turn is overlain by a transparent insulating layer. The method comprises a first step of uniformly charging the photosensitive device by a D.C. charger while subjecting the photosensitive device to an exposure over the whole area thereof; a second step of effecting a charging for adjustment of potential level so as to adjust the potential of the photosensitive device from the level obtained as a result of the charging in the first step to the aimed level; and a third step of exposing the whole area of the photosensitive device. With this method, it is possible to remove electrostatic charge almost perfectly to eliminate undersirable shift of the potential of the photosensitive device after the erasion.
    Type: Grant
    Filed: November 9, 1984
    Date of Patent: March 25, 1986
    Assignee: Olympus Optical Co., Ltd.
    Inventors: Akitoshi Toda, Yoshiyuki Mimura
  • Patent number: 4565436
    Abstract: An electrophotographic process and apparatus for performing the process which employs an electrophotographic photosensitive member of a basic construction in which a photoconductive layer and a transparent insulator layer are sequentially laminated on the surface of a conductive supporter. The process comprises a first step of providing a primary charge uniformly from the surface side of the transparent insulator layer, a second step of performing a secondary corona charging during an imagewise exposure by applying a square wave voltage whose voltage-time integration value of a polarity reverse to the primary charge is larger than that of the same polarity thereas and a third step of forming an electrostatic latent image on the surface of the transparent insulator layer by applying a uniform exposure.
    Type: Grant
    Filed: November 7, 1983
    Date of Patent: January 21, 1986
    Assignee: Olympus Optical Co., Ltd.
    Inventors: Takao Okada, Akitoshi Toda, Yoshiyuki Mimura
  • Patent number: 4545669
    Abstract: This invention relates to an apparatus for simultaneously charging, exposing, and developing imaging members at low voltages which comprises a semi-transparent deflected flexible imaging member, an electronic imaging source means, a light beam deflector member, a modulator means, a laser means, a sensitizing roll means, containing magnets therein, a development roll means containing magnets therein, a voltage source means for the sensitizing roll means, a voltage source means for the development roll means, a developer supply reservoir containing conductive developer particles therein comprised of insulating toner resin particles and conductive carrier particles, a sensitizing nip situated between the flexible imaging member and the sensitizing roll, a development nip situated between the imaging member and the development roller, the sensitizing roll means and development roll means moving in the same direction of movement as the semi-transparent deflected flexible imaging member, the voltage being generated
    Type: Grant
    Filed: February 21, 1984
    Date of Patent: October 8, 1985
    Assignee: Xerox Corporation
    Inventors: Dan A. Hays, William H. Wayman
  • Patent number: 4526848
    Abstract: An electrophotographic process employs an electrophotographic photosensitive member of a basic construction in which a photoconductive layer and a transparent insulator layer are sequentially laminated on the surface of a conductive supporter. The process in one preferred embodiment comprises a first step of providing a primary charge uniformly from the surface side of the transparent insulator layer, a second step of performing a secondary corona charging during an imagewise exposure by applying an a.c. voltage in which the firing angle of a negative half wave is controlled in phase to be within a phase angle corresponding to a lower voltage than the firing angle so that the positive discharge period may be longer than the negative one during one period, and a third step of forming an electrostatic latent image on the transparent insulator layer by applying a uniform exposure.
    Type: Grant
    Filed: November 7, 1983
    Date of Patent: July 2, 1985
    Assignee: Olympus Optical Company Ltd.
    Inventors: Takao Okada, Akitoshi Toda, Yoshiyuki Mimura
  • Patent number: 4524117
    Abstract: An electrophotographic method for the formation of two-colored images comprising: (1) uniformly charging the surface of a photoreceptor having a conductive substance and a photoconductive layer formed on the conductive substance, said photoconductive layer being sensitive to a first color, (2) exposing a two-colored original, to form on said photoconductive layer an electrostatic latent image, which corresponds to a second color region in the original, with the same polarity as the electric charges on the surface of said photoconductive layer, (3) subjecting the surface of said photoreceptor to a reversal development treatment by the use of a photoconductive color toner charged with the same polarity as the electric charges constituting said electrostatic latent image, to develop the non-charged region with the photoconductive color toner, (4) subjecting said electrostatic latent image to a normal development treatment by the use of an insulative toner having a color different from the color of said photocond
    Type: Grant
    Filed: June 15, 1984
    Date of Patent: June 18, 1985
    Assignee: Mita Industrial Co., Ltd.
    Inventors: Kouji Maekawa, Mamoru Kato, Syoji Nakagama, Yumiko Sano
  • Patent number: 4521502
    Abstract: A color recording method wherein equal amounts of photoconductive toner particles of three primary colors are uniformly mixed and applied as a layer on a doner member. Optical color images are projected onto this layer, thereby selectively decreasing the resistivities of the toner particles in patterns corresponding to the optical color images. Simultaneously or immediately thereafter there is applied a voltage thereacross, thereby selectively injecting charge into the photoconductive toner particles with decreased electric resistivities to form a charge distribution in the mixed toner layer corresponding to the projected optical color images. Using the charge distribution formed in the mixed toner layer, color recording is then performed by transferring the toner particles to a recording sheet in accordance with the charge distribution.
    Type: Grant
    Filed: December 16, 1982
    Date of Patent: June 4, 1985
    Assignee: Ricoh Company, Ltd.
    Inventors: Katsuo Sakai, Hiromi Demizu
  • Patent number: 4496641
    Abstract: A method of making a colour display screen for a television display tube is disclosed. On the window portion of the tube an electron-absorbing layer is provided which is scanned by means of an electron beam via the shadow mask. The charge image on the layer is then developed xerographically. The layer is preferably photoconductive so as to be able to remove the charge remaining after the development by means of a uniform exposure.
    Type: Grant
    Filed: January 18, 1983
    Date of Patent: January 29, 1985
    Assignee: U.S. Philips Corporation
    Inventors: Jacob Van Den Berg, Johannes G. Van Lent, Francis B. Strik