Photoconductor Powder Patents (Class 430/901)
  • Patent number: 7476341
    Abstract: A photo-conductor layer for constituting a radiation imaging panel, which photo-conductor layer is capable of recording radiation image information as an electrostatic latent image, is produced. The photo-conductor layer contains a Bi12MO20 sintered material, in which M represents at least one kind of element selected from the group consisting of Ge, Si, and Ti. Sintering processing for the formation of the Bi12MO20 sintered material is performed in an inert gas, atmosphere. Alternatively, the sintering processing is performed at a sintering temperature falling within the range of 800° C. to 900° C. and in an atmosphere, in which an oxygen partial pressure PO2 (Pa) satisfies the condition 10?3?PO2?10?1.
    Type: Grant
    Filed: September 28, 2005
    Date of Patent: January 13, 2009
    Assignee: FUJIFILM Corporation
    Inventors: Motoyuki Tanaka, Shigeru Nakamura, Kiyoteru Miyake
  • Patent number: 7303854
    Abstract: A composition utilized in and a method for forming an electrode used in field emission type of display devices said composition is a photosensitive copper conductive composition comprising: a mixture of (a) copper powder at least 70 wt % out of 100 wt % copper powders having a particle size in the range of 0.2-3 ?m and (b) an inorganic binder with a softening point in the range of 380-580° C. in an amount of 140 wt % based on 100 wt % copper powders, said mixture being dispersed in an organic vehicle comprising (c) an organic polymer binder, (d) a phototoinitiator, (e) a photohardenable monomer, and an organic solvent; and the photosensitive copper conductive composition being fireable at a temperature in the range of 450-600° C. in a reductive atmosphere.
    Type: Grant
    Filed: November 6, 2003
    Date of Patent: December 4, 2007
    Assignee: E.I. du Pont de Nemours and Company
    Inventor: Keiichiro Hayakawa
  • Patent number: 7285371
    Abstract: A photosensitive composition and a color paste for making the photosensitive composition. The photosensitive resin composition comprises a photosensitive resin system; a pigment; a photo-reactive amphipathic molecule; and a solvent. The color paste for making the photosensitive composition comprises the pigment and the photo-reactive amphipathic molecule.
    Type: Grant
    Filed: November 30, 2004
    Date of Patent: October 23, 2007
    Assignee: Industrial Technology Research Institute
    Inventors: Kuo-Tung Huang, Shi-Deh Chao, I-Jein Cheng, Te-Yi Chang, Ming-Tzung Wu, Mon-Haw Chang, Yu-Cheng Chen
  • Patent number: 5543259
    Abstract: Disclosed are dry and liquid developers suitable for the development of electrostatic latent images. The developers contain a colorant selected from the group consisting of: (a) those of Formula I ##STR1## wherein R.sub.1 is an electron withdrawing group, R.sub.2 is selected from the group consisting of hydrogen, alkyl, substituted alkyl, aryl, substituted aryl, arylalkyl, and substituted arylalkyl, R.sub.3 is selected from the group consisting of hydrogen, alkyl, substituted alkyl, aryl, substituted aryl, arylalkyl, and substituted arylalkyl, and Ar is selected from the group consisting of aryl, substituted aryl, arylalkyl, and substituted arylalkyl; (b) those of Formula II ##STR2## wherein R.sub.1 is selected from the group consisting of hydrogen, alkyl, substituted alkyl, aryl, substituted aryl, arylalkyl, and substituted arylalkyl, R.sub.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: August 6, 1996
    Assignee: Xerox Corporation
    Inventors: William M. Schwarz, Timothy J. Fuller
  • Patent number: 5260158
    Abstract: A photoconductive toner of the present invention contains a resin binder, zinc oxide, and a dye for sensitization of the zinc oxide, the sensitizer dye being represented by the following formula (1): ##STR1## wherein, X.sup.1 to X.sup.8 represent hydrogen or methoxy groups with a proviso that at least one of X.sup.1 to X.sup.8 represents a methoxy group, R.sup.1 and R.sup.2 are independently alkyl groups or derivatives thereof, and n is an integer. A photoconductive toner of the present invention satisfies requirements for both sensitivity and coloration, and, moreover, possesses high photosensitivity in the laser wavelength region as compared with conventional toners.
    Type: Grant
    Filed: June 18, 1991
    Date of Patent: November 9, 1993
    Assignee: Mita Industrial Co., Ltd.
    Inventors: Hiroyuki Yamaji, Akiyoshi Urano, Yumiko Sano
  • Patent number: 5238607
    Abstract: The photoconductive range of a photoconductive polymer can be extended to include longer wavelengths, and/or the photo-induced discharge rate of a photoconductive polymer can be increased by incorporating effective amounts of clusters of IIB-VIB, IIB-VB, IIIB-VB, IIIB-VIB, IB-VIB and/or IVB-VIIB semiconductors, said clusters having a size within the range of from about 0.001 .mu.m to 10 .mu.m. Compositions comprising a photoconductive polymer and an effective amount of said clusters may be used in electrostatic imaging processes.
    Type: Grant
    Filed: February 28, 1992
    Date of Patent: August 24, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Norman Herron, Ying Wang
  • Patent number: 5060020
    Abstract: An image recording apparatus uses coloring photosensitive toner for a full-color copying which is in the form of a microcapsule having a shell, a photosensitive resin and a chromogenic material both encapsulated in the shell, and a developer material coated on the outer surface of the shell. To increase the monochromatic copying speed, the apparatus further uses a monochromatic toner. When a user's switch is depressed, a driver unit selects either one of the full-color and monochromatic color copying mode. When the monochromatic image is to be copied, a pressure developing unit which is used for pressure developing a color latent image is retracted, so that a recording medium on which a monochromatic toner image is deposited is free from the pressure imparted by the pressure developing unit and the pressure developing unit is not smeared with the monochromatic toner powders.
    Type: Grant
    Filed: September 5, 1990
    Date of Patent: October 22, 1991
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Jun Sakai
  • Patent number: 4978595
    Abstract: According to the present invention, the incorporation of polymeric-magnetic coordination complex powder in a photoconductive toner effects the production of toners excellent in dispersibility, heat stability, toner film formability and color reproducibility.
    Type: Grant
    Filed: October 11, 1989
    Date of Patent: December 18, 1990
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Masahiro Anno, Junji Machida, Junji Ohtani, Eiichi Sano, Fumio Masuda
  • Patent number: 4954413
    Abstract: A method for making a photoconductive powder which comprises the steps of preparing fine particles of metal oxide or metal hydroxide by hydrolyzing a metal alkoxide or metal acetylacetonate; and immersing the fine particles into pigment containing suspensions to provide three types of composite particles. Each of the suspensions contains a respective pigment having a spectral absorption band within the wavelength region of a one of the primary colors of the additive principle. Each type of the resultant composite particles is composed of the fine particles of the metal oxide or metal hydroxide and the associated pigment as a principal component.
    Type: Grant
    Filed: October 18, 1989
    Date of Patent: September 4, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Fusaoki Uchikawa, Kenji Nomura
  • 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: 4921768
    Abstract: A photoconductive image forming method in a which charged toner contacts a transparent insulating substrate and is exposed from within the substrate. Exposure reduces the resistivity of the toner so that its charge can be reversed by a bias voltage and the exposed toner will adhere to the image forming substrate simultaneously with exposure and then transfer to a transfer medium. In an alternative embodiment of the invention, a layer of toner is applied to an electroconductive substrate and the toner layer is exposed with a latent image. The charge of the exposed toner is reversed and the exposed toner is removed by an intermediate toner removal device. The remaining toner is then transferred to a transfer medium. Toner suitable for use includes azo-type metal containing black dyes which do not absorb the exposure and can be sensitized to the near infrared region.
    Type: Grant
    Filed: October 5, 1988
    Date of Patent: May 1, 1990
    Assignee: Seiko Epson Corporation
    Inventors: Masanao Kunugi, Hajime Kurihara, Teruyuki Mizumoto
  • Patent number: 4897330
    Abstract: An image forming method wherein a latent image is formed by subjecting an image retainer having a photoconductive layer to a image exposure, a toner image is formed by developing the latent image with a toner, each the step of forming the latent image and the step of forming the toner image are repeated at least one time, and a plurality of toner images formed on the image retainer to a transfer material. At least one of the toner images is formed with a toner which has a spectral transmissivity as to substantially absorb a visible light but transmit a light having a wavelength of 750 nm or more. The latent image is formed by subjecting the image retainer bearing the toner image to an image exposure with a light containing a wavelength component of 750 nm or more.
    Type: Grant
    Filed: December 9, 1987
    Date of Patent: January 30, 1990
    Assignee: Konica Corporation
    Inventors: Hisashi Shoji, Satoshi Haneda, Kunihisa Yoshino, Yuki Okuyama
  • Patent number: 4701389
    Abstract: Disclosed is a photoconductive toner comprising as a main component a photoconductive substance dissolved or dispersed in a binder resin medium, wherein when the photoconductive substance is a p-type semiconductor, it is combined with a binder resin having a positive tribochargeability and when the photoconductive substance is an n-type semiconductor, it is combined with a binder resin having a negative tribochargeability.
    Type: Grant
    Filed: July 9, 1986
    Date of Patent: October 20, 1987
    Assignee: Mita Industrial Co., Ltd.
    Inventors: Teruyo Morimoto, Yumiko Sano, Eiji Nimura, Yuji Tomii, Tatsuo Maeda
  • Patent number: 4608330
    Abstract: A method for forming microcapsules by enwrapping an oily core material in a formaldehyde condensation product formed in situ wherein methylated polygalacturonic acid is used as an emulsion stabilizer; the method is particularly useful in forming photosensitive microcapsules in that uniform small microcapsule size is obtained.
    Type: Grant
    Filed: March 27, 1985
    Date of Patent: August 26, 1986
    Assignee: The Mead Corporation
    Inventor: Charles P. Marabella
  • Patent number: 4594302
    Abstract: A developing process for two-colored electrophotography comprising: (1) charging the surface of a photoreceptor having a conductive substrate and two photosensitive layers successively formed on the conductive substrate, said photosensitive layers having different spectral sensitivities, (2) charging the surface of said photoreceptor with a different polarity from the charging polarity in step (1), (3) exposing a two-colored original to form electrostatic latent images, which have different polarities corresponding to the two-colored original, on the surface of said photoreceptor, (4) transferring a first color toner charged with a different polarity from the charging polarity of one of the electrostatic latent images on said electrostatic latent image to develop said electrostatic latent image iwth the first color toner, (5) exposing the surface of said photoreceptor to eliminate electric charges with the same polarity as the first color toner which are induced on the surface of said photoreceptor in the vic
    Type: Grant
    Filed: May 29, 1985
    Date of Patent: June 10, 1986
    Assignee: Mita Industrial Co., Ltd.
    Inventor: Masahiko Kubo
  • Patent number: 4542084
    Abstract: A method for forming a color image includes a step of spraying three kinds of photoconductive toners with a sensitization wavelength band different from its absorption wavelength band, a step of electrically charging these different toners, a step of exposing these sprayed and electrically charged photoconductive toners to light for selectively removing electrostatic charges, and a step of removing the toners freed of electrostatic charges from the substrate. The magenta color photoconductive toners sensitive to red light, yellow color photoconductive toners sensitive to green light, and the cyan color photoconductive toners sensitive to blue light, are used as aforementioned three kinds of photoconductive colors.
    Type: Grant
    Filed: July 25, 1984
    Date of Patent: September 17, 1985
    Assignee: Sony Corporation
    Inventors: Haruo Watanabe, Junetsu Seto, Kiyosuke Suzuki, Toshiaki Fukuma
  • Patent number: 4433041
    Abstract: A recording method of forming a picture image directly on a recording sheet by a magnetic brushing process using a dry developing powder on the basis of an input picture signal not by forming an optical image directly on the recording sheet surface.
    Type: Grant
    Filed: March 3, 1982
    Date of Patent: February 21, 1984
    Assignee: Hitachi Metals, Ltd.
    Inventor: Keitaro Yamashita
  • Patent number: 4314013
    Abstract: An improved photoelectrophorectic imaging process which comprises placing a suspension of double encapsulated electrically photosensitive particles in an electric field between a pair of surfaces, exposing the suspension to a pattern of electrogmagnetic radiation and separating the surfaces whereby the exposed portion of the suspension adheres to one surface and the unexposed portion adheres to the other surface. The imaging particles are comprised of a first resin which encapsulates a colorant for the particle and second resin which encapsulates the first resin and contains the electrically photosensitive material.
    Type: Grant
    Filed: April 4, 1979
    Date of Patent: February 2, 1982
    Assignee: Xerox Corporation
    Inventor: Yew C. Chang
  • Patent number: 4308329
    Abstract: An imaging method, and novel materials, in which there is provided an imaging mono-layer comprising a plurality of electrically photosensitive particles which comprise a resin carrier, a colorant dye, an electrically photosensitive organic material, a sensitizing dye, and a solubilizing agent for the sensitizing dye in the organic material. The imaging mono-layer is subjected to an electric field, exposed to a pattern of sensitizing electromagnetic radiation, separation of the photosensitized particles from the unsensitized particles, and color-amplification of the desired image by imbibing the colorant dye into a suitable substrate.
    Type: Grant
    Filed: November 2, 1979
    Date of Patent: December 29, 1981
    Assignee: Xerox Corporation
    Inventors: Ray H. Luebbe, Jr., Martin Maltz
  • Patent number: 4281055
    Abstract: Photosensitive element for electrophotography which comprises(a) a photosensitive layer composed of (1) a binder resin and (2) particles of photoconductive material being dispersed in said binder resin and each particle comprising a photoconductive zinc oxide particle having been encapsulated over its surface with an encapsulating resinous material;(b) an electroconductive support for said photosensitive layer; and(c) an intermediate layer being located between said photosensitive layer and said support, and composed of a water-soluble polymer.The water-soluble polymer preferably is a casein, and a sensitizing agent preferably is adsorbed by the surface of the zinc oxide particle and or included in the encapsulating resinous layer.
    Type: Grant
    Filed: February 19, 1980
    Date of Patent: July 28, 1981
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Hiroyuki Moriguchi, Satoshi Haneda, Tadashi Kaneko, Akira Itoh, Takeo Shimura, Masanori Matsumoto, Hiroyuki Nomori