Patents by Inventor Akira Yoshida

Akira Yoshida has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of producing gallium phthalocyanine crystal and method of producing electrophotographic photosensitive member using the method of producing gallium phthalocyanine crystal
    Patent number: 9034554
    Abstract: Provided is a method of producing an electrophotographic photosensitive member having improved sensitivity and capable of outputting an image having less image defects due to a ghost phenomenon not only under a normal-temperature, normal-humidity environment but also under a low-temperature, low-humidity environment as a particularly severe condition. The method of producing a gallium phthalocyanine crystal includes subjecting a gallium phthalocyanine and a specific amine compound, which are added to a solvent, to a milling treatment to perform crystal transformation of the gallium phthalocyanine. In addition, the gallium phthalocyanine crystal is used in the photosensitive layer of the electrophotographic photosensitive member.
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: May 19, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Masato Tanaka, Masataka Kawahara, Kaname Watariguchi, Takeshi Murakami, Akira Yoshida
  • IMAGE FORMING APPARATUS
    Publication number: 20150125168
    Abstract: An image forming apparatus includes an image bearer; a charger to charge the image bearer; an electrostatic latent image former to form an electrostatic latent image on the image bearer; an image developer to develop the electrostatic latent image with a toner to form a visual toner image; a transferer to transfer the toner image on a transfer material; a toner concentration calculator to calculate a concentration of the toner; and an optical detector. At least a toner patch image is formed on the image bearer with an irradiation quantity set such that an irradiated part potential is larger than a developing condition, the toner patch image is read by the optical detector, and the charging condition is corrected on the basis of a difference between a toner concentration of the toner patch image and a target toner concentration.
    Type: Application
    Filed: October 17, 2014
    Publication date: May 7, 2015
    Inventors: Keita GOTOH, Akira YOSHIDA
  • Electrophotographic photosensitive member, method for producing the same, process cartridge, and electrophotographic apparatus
    Patent number: 8993204
    Abstract: According to aspects of the present invention, an electrophotographic photosensitive member includes a surface layer comprising a cured resin obtained by polymerizing a compound having at least one polymerizable functional group. Aspects of the present invention provide an electrophotographic photosensitive member whose surface layer comprises a compound (urea derivative) having a certain structure, a method for producing the electrophotographic photosensitive member, and a process cartridge and an electrophotographic apparatus including the electrophotographic photosensitive member.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: March 31, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masaki Nonaka, Masato Tanaka, Masataka Kawahara, Michiyo Sekiya, Akira Yoshida
  • Electrophotographic photosensitive member, method of producing phthalocyanine crystal, method of producing electrophotographic photosensitive member, process cartridge, electrophotographic apparatus, and phthalocyanine crystal
    Patent number: 8974991
    Abstract: Provided is an electrophotographic photosensitive member including a support and a photosensitive layer formed on the support, in which the photosensitive layer includes a phthalocyanine crystal containing a compound satisfying the following formulae (A) and (B) in itself: 8.9??P?10.7 (A) and ?3.2?L??1.5 (B) (in the formula (A), ?P represents a polar term of Hansen Solubility Parameters, and in the formula (B), L represents an energy level (eV) of an LUMO (lowest unoccupied molecular orbital) obtained as a result of structural optimization calculation based on density functional calculation B3LYP/6-31G).
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: March 10, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masataka Kawahara, Masato Tanaka, Kaname Watariguchi, Takeshi Murakami, Akira Yoshida
  • WASHING DEVICE AND WASHING METHOD
    Publication number: 20150034496
    Abstract: A washing device includes a container (10) in which aqueous solution is contained, an adsorption electrode (11) which is placed in the container (10) and on which adsorption and desorption of ions in the aqueous solution can be brought about, a counter electrode (12) which is placed in the container (10) so as to face the adsorption electrode (11), a direct-current power source (20) for applying a voltage between the adsorption electrode (11) and the counter electrode (12), and a switching circuit (30) for switching polarity of the voltage applied between the adsorption electrode (11) and the counter electrode (12).
    Type: Application
    Filed: March 15, 2013
    Publication date: February 5, 2015
    Inventors: Takeshi Kawazu, Hirotsugu Yano, Akira Yoshida
  • ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS
    Publication number: 20140363759
    Abstract: In order to provide an electrophotographic photosensitive member with which a ghost is suppressed even under a low temperature and low humidity environment, and a process cartridge and an electrophotographic apparatus having the electrophotographic photosensitive member, the electrophotographic photosensitive member has a support, an undercoat layer formed on the support, and a photosensitive layer formed on the undercoat layer and comprising a charge generating material and a hole transporting material, wherein the undercoat layer comprises a particular amine compound.
    Type: Application
    Filed: August 25, 2014
    Publication date: December 11, 2014
    Inventors: Kaname Watariguchi, Takeshi Murakami, Masataka Kawahara, Masato Tanaka, Akira Yoshida
  • NITRIDE SEMICONDUCTOR SUBSTRATE
    Publication number: 20140339679
    Abstract: A nitride semiconductor substrate suitable for a high withstand voltage power device is provided in which current collapse is controlled, while reducing leakage current. In a nitride semiconductor substrate, wherein a buffer layer, an active layer, and an electron supply layer, each comprising a group 13 nitride, are stacked one by one on a silicon single crystal substrate, the buffer layer has a structure where a multilayer stack in which a pair of nitride layers having different concentrations of Al or Ga are repeatedly deposited a plurality of times on an initial layer of AlxGa1-xN (0?x?1) is stacked, and includes a doping layer whose carbon concentration is 1×1018 to 1×1021 cm?3 and whose Si concentration is 1×1017 to 1×1020 cm?3, a thickness of the doping layer is 15% or more of the total thickness of the buffer layer.
    Type: Application
    Filed: May 7, 2014
    Publication date: November 20, 2014
    Applicant: Covalent Materials Corporation
    Inventors: Jun KOMIYAMA, Akira YOSHIDA, Hiroshi OISHI
  • NITRIDE SEMICONDUCTOR SUBSTRATE
    Publication number: 20140319535
    Abstract: A nitride semiconductor substrate is provided which is suitable for a high withstand voltage power device and prevents a warp and a crack from generating in a Si substrate when forming a thick nitride semiconductor layer on the substrate. A nitride semiconductor substrate 1 is prepared in such a manner that a buffer layer 3 and a semiconductor active layer 4 each comprising a group 13 nitride are stacked one by one on one principal plane of a Si single crystal substrate, the one principal plane has an offset angle of 0.1° to 1° or ?1° to ?0.1° with respect to a (111) plane, an average dopant concentration in a bulk is 1×1018 to 1×1021 cm?3, the Si single crystal substrate 2 has a SiO2 film on the back, and the total thickness of the buffer layer 3 and the semiconductor active layer 4 is 4 to 10 ?m.
    Type: Application
    Filed: April 22, 2014
    Publication date: October 30, 2014
    Applicant: COVALENT MATERIALS CORPORATION
    Inventors: Jun KOMIYAMA, Kenichi ERIGUCHI, Akira YOSHIDA, Hiroshi OISHI, Yoshihisa ABE, Shunichi SUZUKI
  • ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE, ELECTROPHOTOGRAPHIC APPARATUS, AND GALLIUM PHTHALOCYANINE CRYSTAL
    Publication number: 20140308606
    Abstract: Provided is an electrophotographic photosensitive member, a process cartridge and an electrophotographic apparatus each having the electrophotographic photosensitive member that can output an image having less image defects due to a ghost phenomenon not only under a normal-temperature, normal-humidity environment but also under a low-temperature, low-humidity environment as a particularly severe condition. The electrophotographic photosensitive member includes a support and a photosensitive layer formed on the support, in which the photosensitive layer includes a gallium phthalocyanine crystal containing a specific amine compound in itself.
    Type: Application
    Filed: November 29, 2012
    Publication date: October 16, 2014
    Inventors: Masato Tanaka, Masataka Kawahara, Kaname Watariguchi, Takeshi Murakami, Akira Yoshida
  • BINDER COMPOSITION FOR MAKING SELF-HARDENING FOUNDRY MOLDS, AND METHOD OF PRODUCING FOUNDRY MOLD USING THE SAME
    Publication number: 20140296372
    Abstract: The present invention relates to a binder composition for making self-hardening foundry molds that is capable of improving the hardening speed of the molds and the strength of the molds, and is excellent in storage stability; and a method for producing a foundry mold, using this composition. The binder composition for making self-hardening foundry molds of the present invention is a binder composition for making self-hardening foundry molds, comprising a furan resin and an ion compound, wherein the ion compound contains at least one anion selected from the group consisting of a hydrogensulfite ion, a sulfite ion, a pyrosulfite ion, a thiosulfate ion, a thionate ion, and a dithionite ion; the content of the anion is from 0.006 to 0.60 parts by weight for 100 parts by weight of the furan resin; and the composition has a pH of 6 or less at 25° C.
    Type: Application
    Filed: August 31, 2012
    Publication date: October 2, 2014
    Applicant: KAO CORPORATION
    Inventors: Ryoji Iwamoto, Akira Yoshida
  • Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus
    Patent number: 8841052
    Abstract: In order to provide an electrophotographic photosensitive member with which a ghost is suppressed even under a low temperature and low humidity environment, and a process cartridge and an electrophotographic apparatus having the electrophotographic photosensitive member, the electrophotographic photosensitive member has a support, an undercoat layer formed on the support, and a photosensitive layer formed on the undercoat layer and comprising a charge generating material and a hole transporting material, wherein the undercoat layer comprises a particular amine compound.
    Type: Grant
    Filed: November 21, 2012
    Date of Patent: September 23, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kaname Watariguchi, Takeshi Murakami, Masataka Kawahara, Masato Tanaka, Akira Yoshida
  • Optical sensor with positioning reference surface and image forming apparatus incorporating optical sensor
    Patent number: 8811846
    Abstract: An optical sensor attached to an apparatus includes a substrate and a light emitting element mounted on a first surface of the substrate. The light emitting element emits a light to a detection object in parallel to the substrate. A light receiving element is mounted on the first surface of the substrate. The light receiving element receives a regular reflection light reflected by the detection object. The said first surface serves as a positioning reference for positioning the optical sensor on an optical sensor mounting member provided in the apparatus.
    Type: Grant
    Filed: February 17, 2011
    Date of Patent: August 19, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Akira Yoshida, Hitoshi Ishibashi, Yoshiaki Miyashita, Kohta Fujimori, Nobutaka Takeuchi, Kayoko Tanaka
  • Memory control apparatus
    Patent number: 8812810
    Abstract: A memory control apparatus includes: a plurality of setting output units each configured to output setting information for setting operation of each of a plurality of memory cells; and a plurality of selection units each configured to select operation or stop of the operation of each of the plurality of memory cells in accordance with the setting information.
    Type: Grant
    Filed: December 9, 2010
    Date of Patent: August 19, 2014
    Assignee: Semiconductor Components Industries, LLC
    Inventors: Akira Yoshida, Osamu Fujimoto, Hideyuki Ochi
  • Nitride semiconductor substrate and method of manufacturing the same
    Patent number: 8785942
    Abstract: A nitride semiconductor substrate suitable for a normally-off type high breakdown-voltage device and a method of manufacturing the substrate are provided allowing both a higher threshold voltage and improvement in current collapse. In a nitride semiconductor substrate 10 having a substrate 1, a buffer layer 2 formed on one principal plane of the substrate 1, an intermediate layer 3 formed on the buffer layer 2, an electron transport layer 4 formed on the intermediate layer 3, and an electron supply layer 5 formed on the electron transport layer 4, the intermediate layer 3 has a thickness of 200 nm to 1500 nm and a carbon concentration of 5×1016 atoms/cm3 to 1×1018 atoms/cm3 and is of AlxGa1-xN (0.05?x?0.24), and the electron transport layer 4 has a thickness of 5 nm to 200 nm and is of AlyGa1-yN (0?y?0.04).
    Type: Grant
    Filed: January 18, 2012
    Date of Patent: July 22, 2014
    Assignee: Covalent Materials Corporation
    Inventors: Akira Yoshida, Jun Komiyama, Yoshihisa Abe, Hiroshi Oishi, Kenichi Eriguchi, Shunichi Suzuki
  • ELECTRONIC DEVICE AND CONTROL METHOD THEREOF
    Publication number: 20140184085
    Abstract: According to one embodiment, an electronic device includes, a light source, LED protective elements, a detecting module, a determining module, and a setting module. The light source includes LED elements connected in series. The power supplying module configured to supply a drive voltage to the light source. The LED protective elements connected to the respective LED elements in parallel. The detecting module configured to detect a fluctuation in the drive voltage supplied to the light source and the LED protective elements. The determining module configured to determine that the fluctuation in the drive voltage detected by the detecting module has an abnormal value.
    Type: Application
    Filed: September 3, 2013
    Publication date: July 3, 2014
    Applicant: Kabushiki Kaisha Toshiba
    Inventor: Akira Yoshida
  • ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE AND ELECTROPHOTOGRAPHIC APPARATUS
    Publication number: 20140141362
    Abstract: An electrophotographic photosensitive member includes a support, an undercoat layer formed on the support, and a photosensitive layer which is formed on the undercoat layer and contains a charge generating substance and a hole transporting substance. The undercoat layer contains a specific amine compound, titanium oxide crystal particles having an average primary particle diameter of 3 nm or more and 15 nm or less and an organic resin.
    Type: Application
    Filed: November 12, 2013
    Publication date: May 22, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Kaname Watariguchi, Masato Tanaka, Masataka Kawahara, Akira Yoshida
  • CUSHIONING-MATERIAL SURFACE LAYER AND HOT-PRESS CUSHIONING MATERIAL
    Publication number: 20140120792
    Abstract: The cushioning-material surface layer 11a includes a resin layer 12 disposed on one side of the surface layer 11a to cover the side thereof, a rubber layer 13 disposed on the other side of the surface layer 11a to cover the side thereof, and a woven fabric layer 14 disposed between the resin layer 12 and rubber layer 13 and including bulked yarns for at least one of warp and weft. The woven fabric layer 14 includes a woven fabric-resin composite layer 17 disposed on the resin layer 12 side and formed by impregnating part of the woven fabric with resin that forms the resin layer 12, and a woven fabric-rubber composite layer 18 disposed on the rubber layer 13 side and formed by impregnating part of the woven fabric with rubber that forms the rubber layer 13. The woven fabric layer 14 includes interstices 20 therein.
    Type: Application
    Filed: June 7, 2011
    Publication date: May 1, 2014
    Applicant: YAMAUCHI CORPORATION
    Inventors: Akira Yoshida, Takamitsu Ozeki
  • Hot-press cushion material and manufacturing method of the same
    Patent number: 8709590
    Abstract: A hot-press cushion material is a complex comprising paper formed of a fiber material and a rubber impregnated in the paper, and the volume ratio between the fiber material and the rubber is within a range of 1/1.5 to 1/7.5, and the void ratio in the complex is within a range of 60 to 90%.
    Type: Grant
    Filed: July 18, 2007
    Date of Patent: April 29, 2014
    Assignee: Yamauchi Corporation
    Inventor: Akira Yoshida
  • Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus
    Patent number: 8703372
    Abstract: An electrophotographic photosensitive member includes a support, a charge-generating layer disposed on the support, and a charge-transporting layer disposed on the charge-generating layer, in which the charge-generating layer contains a charge-generating substance and a compound represented by the formula (1). A process cartridge includes the electrophotographic photosensitive member described above. An electrophotographic apparatus includes the electrophotographic photosensitive member described above.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: April 22, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takeshi Murakami, Masataka Kawahara, Kaname Watariguchi, Masato Tanaka, Akira Yoshida
  • Nitride semiconductor substrate
    Patent number: 8637960
    Abstract: A nitride semiconductor substrate is provided in which leak current reduction and improvement in current collapse are effectively attained when using Si single crystal as a base substrate. The nitride semiconductor substrate is such that an active layer of a nitride semiconductor is formed on one principal plane of a Si single crystal substrate through a plurality of buffer layers made of a nitride, in the buffer layers, a carbon concentration of a layer which is in contact with at least the active layer is from 1×1018 to 1×1020 atoms/cm3, a ratio of a screw dislocation density to the total dislocation density is from 0.15 to 0.3 in an interface region between the buffer layer and the active layer, and the total dislocation density in the interface region is 15×109 cm?2 or less.
    Type: Grant
    Filed: October 2, 2012
    Date of Patent: January 28, 2014
    Assignee: Covalent Material Corporation
    Inventors: Yoshihisa Abe, Jun Komiyama, Hiroshi Oishi, Akira Yoshida, Kenichi Eriguchi, Shunichi Suzuki