Patents by Inventor Takeo Oshiba

Takeo Oshiba 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).

  • Patent number: 11929531
    Abstract: A substrate for a composite membrane includes a microporous polyolefin membrane for carrying a hydrophilic resin compound within the pores of the microporous membrane wherein: the average pore diameter is 1 nm to 50 nm; the porosity is 50% to 78%; the membrane thickness is 1 ?m to 12 ?m; and, when a mixed solution of ethanol and water (volume ratio 1/2) is dripped onto a surface of the microporous polyolefin membrane which has not undergone hydrophilization treatment, the contact angle ?1 between the droplet and the surface is 0 to 90 degrees 1 second after the dripping, and the contact angle ?2 between the droplet and the surface is 0 to 70 degrees 10 minutes after the dripping, and the rate of change of the contact angle ((?1??2)/?1×100) is 10 to 50%.
    Type: Grant
    Filed: March 15, 2022
    Date of Patent: March 12, 2024
    Assignee: TEIJIN LIMITED
    Inventors: Takeo Yamaguchi, Yuhei Oshiba, Hidenori Ohashi, Jin Tomatsu, Koji Furuya, Takao Ohno, Mami Nanbu
  • Publication number: 20160221261
    Abstract: The three-dimensional shaping device is provided with: a first forming section for forming the outline (210) of a shaping material layer at a first resolution by discharging the shaping material toward a shaping stage; and a discharge part and a curing part that configure a second forming section for forming the inside of the outline (210) at a second resolution that is lower than the first resolution by discharging a shaping material (182) toward the shaping stage.
    Type: Application
    Filed: September 10, 2014
    Publication date: August 4, 2016
    Applicant: Konica Minolta, Inc.
    Inventors: Naoki YAMAMOTO, Takeo OSHIBA, Takuya ISHIGAI, Wataru ONODA
  • Patent number: 8029955
    Abstract: Provide is an electrophotographic photoreceptor exhibiting excellent evenness of halftone images together with fine line reproduction, and an image forming method thereof, as to a photoreceptor in which an oxytitanium phthalocyanine pigment having a maximum diffraction peak at a Bragg angle (2?±0.2°) of 27.2° in CuK? X-ray diffraction. Also disclosed is an electrophotographic photoreceptor possessing a body having cylindrical conductive support provided thereon photosensitive layer containing oxytitanium phthalocyanine pigment having maximum diffraction peak at a Bragg angle (2?±0.2°) of 27.2° in CuK? X-ray diffraction, and flanges jointed at both ends of the body, wherein at least one of flanges is fitted with driving shaft having drive hole having at least 3 sides, and a ratio B/A of cross-sectional area B of engaging part of rotation shaft to rotate the electrophotographic photoreceptor with respect to cross-sectional area A of the drive hole is 0.890-0.998.
    Type: Grant
    Filed: January 29, 2009
    Date of Patent: October 4, 2011
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Eiichi Sakai, Yoshihiko Eto, Kimiyuki Itou, Akihiko Itami, Takeo Oshiba
  • Patent number: 7981586
    Abstract: An electrophotographic image forming method is disclosed. The method includes steps of conveying a developer comprising a toner to a developing zone by a developing roller, and developing an electrostatic latent image formed on an electrostatic latent image carrying member by the developer, and the developing roller has an electroconductive shaft and a resin layer provided around the shaft, the resin layer comprises a surface layer containing silicone copolymer resin as the principal component and a layer containing resin-silica hybrid composite as a principal component provided directly under the surface layer.
    Type: Grant
    Filed: September 6, 2007
    Date of Patent: July 19, 2011
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Satoshi Uchino, Masahiro Anno, Takeo Oshiba, Okushi Okuyama, Shinya Obara
  • Patent number: 7885585
    Abstract: An objective is to provide a developing roller in which increase of residual potential is inhibited during repetitive operation without deteriorating adhesion to an elastic layer, scattering and leakage of toner are prevented, appropriate elasticity is exhibited and a resin layer capable of preventing uneven charging of toner and image unevenness is prepared, and also to provide a image forming method employing the developing roller. Disclosed is a developing roller possessing an elastic layer made of silicone rubber provided around a conductive shaft, and a resin layer further provided on the elastic layer, wherein the resin layer contains polyurethane resin-silica hybrid as a principal component.
    Type: Grant
    Filed: March 2, 2007
    Date of Patent: February 8, 2011
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Satoshi Uchino, Nobuaki Kobayashi, Takeo Oshiba, Okushi Okuyama, Kouichi Sugama
  • Patent number: 7831183
    Abstract: A developing roller comprising: a shaft comprising an aluminum alloy; and a coating layer directly formed on a periphery of the shaft, the coating layer comprising a conducting agent and a binder comprising a resin, wherein the aluminum alloy comprises 0.2 to 0.8% by mass of silicon and 0.05 to 1.5% by mass of maganese, based on the total mass of the aluminum alloy.
    Type: Grant
    Filed: September 17, 2007
    Date of Patent: November 9, 2010
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Takeo Oshiba, Masahiro Anno, Okushi Okuyama, Satoshi Uchino, Shinya Obara, Ryuichi Hiramoto, So Matsuya
  • Patent number: 7672626
    Abstract: An objective is to provide a developing roller in which increase of residual potential is inhibited during repetitive operation without deteriorating interlayer adhesion, and prepared is a layer immediately below the surface capable of preventing fog caused by toner scattering, accompanied with a surface layer capable of preventing stains formed from foreign matters adhered to the surface, as well as preventing image unevenness since toner electrification is even under the presence of appropriate elasticity, and also to provide a image forming method employing the developing roller. Disclosed is a developing roller possessing an elastic layer made of silicone rubber provided around a conductive shaft, and a plurality of resin layers further provided on the elastic layer, wherein an outermost surface layer among the resin layers comprises silicone copolymerization polyurethane; and a layer immediately below the surface layer comprises a polyurethane resin-silica hybrid.
    Type: Grant
    Filed: February 23, 2007
    Date of Patent: March 2, 2010
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Satoshi Uchino, Nobuaki Kobayashi, Takeo Oshiba, Okushi Okuyama, Kouichi Sugama
  • Publication number: 20090245892
    Abstract: In the present invention, provided can be a developing roller through which neither fog nor contamination inside the apparatus is generated, and no insufficient image density is produced, even though printing a large number of paper sheets (5000 paper sheets, for example). Also disclosed is a developing roller possessing a conductive shaft and a coating layer provided on an outer circumference of the conductive shaft, wherein the coating layer possesses a resin and a surface roughness particle, and the coating layer surface has a surface roughness Ra of 0.5-2.5 ?m and a Young's modulus Y of 1-200 MPa.
    Type: Application
    Filed: March 25, 2009
    Publication date: October 1, 2009
    Applicant: Konica Minolta Business Technologies, Inc.
    Inventors: Shinya OBARA, Akira OHIRA, Takeo OSHIBA
  • Publication number: 20090197195
    Abstract: Provide is an electrophotographic photoreceptor exhibiting excellent evenness of halftone images together with fine line reproduction, and an image forming method thereof, as to a photoreceptor in which an oxytitanium phthalocyanine pigment having a maximum diffraction peak at a Bragg angle (2?±0.2°) of 27.2° in CuK? X-ray diffraction. Also disclosed is an electrophotographic photoreceptor possessing a body having cylindrical conductive support provided thereon photosensitive layer containing oxytitanium phthalocyanine pigment having maximum diffraction peak at a Bragg angle (2?±0.2°) of 27.2° in CuK? X-ray diffraction, and flanges jointed at both ends of the body, wherein at least one of flanges is fitted with driving shaft having drive hole having at least 3 sides, and a ratio B/A of cross-sectional area B of engaging part of rotation shaft to rotate the electrophotographic photoreceptor with respect to cross-sectional area A of the drive hole is 0.890-0.998.
    Type: Application
    Filed: January 29, 2009
    Publication date: August 6, 2009
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Eiichi SAKAI, Yoshihiko Eto, Kimiyuki Itou, Akihiko Itami, Takeo Oshiba
  • Publication number: 20090123854
    Abstract: An electrophotographic image forming method is disclosed, wherein a cylindrical developing sleeve carrying a developer is brought into contact with a photoreceptor with rotating the developing sleeve in the counter direction to the rotation of the photoreceptor, and a lubricant is supplied to the photoreceptor and the photoreceptor comprises a uppermost surface layer containing a polyarylate having a structure unit represented by the following formula and the toner comprises toner particles exhibiting a glass transition temperature of from 16 to 44° C.
    Type: Application
    Filed: November 6, 2008
    Publication date: May 14, 2009
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Akihiko ITAMI, Eiichi SAKAI, Yoshihiko ETO, Takeo OSHIBA
  • Patent number: 7505720
    Abstract: Provided are a developing roller for non-magnetic single component development and a developing method employing the developing, by which toner can be stably conveyed in any external environment, and the stable toner conveyance and charging amount can also be acquired. Also disclosed is a developing roller possessing a spindle and provided around an outer circumference of the spindle, at least an elastic layer (innermost layer), a resistance adjusting layer (intermediate layer) formed on the elastic layer and a surface layer (outermost layer) formed on the resistance adjusting layer, wherein the intermediate layer possesses a layer containing carbon black in a resin, a content of a polycyclic aromatic hydrocarbon in the carbon black is at most 10 ppm, and a volume resistance (Rv) of all the layers provided around the outer circumference of the spindle is 1.0×107?1.0×1013 ?·cm.
    Type: Grant
    Filed: October 24, 2006
    Date of Patent: March 17, 2009
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Kouichi Sugama, Nobuaki Kobayashi, Takeo Oshiba, Okushi Okuyama, Satoshi Uchino
  • Publication number: 20080220363
    Abstract: A developing roller for electrophotographic image forming apparatus is disclosed. The developing roller has a shaft and a resin layer, and the resin layer comprises a binder resin, a resin particle having a particle diameter of 5 ?m to 30 ?m and a content of from 10% to 50% by weight with respect to the resin layer, and inorganic oxide particles having a number based average primary particle diameter of 5 nm to 100 nm and a content of 1% to 40% by weight with respect to the resin layer. An image forming method employing the developer roller is also disclosed.
    Type: Application
    Filed: March 4, 2008
    Publication date: September 11, 2008
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Satoshi UCHINO, Masahiro ANNO, Takeo OSHIBA, Okushi OKUYAMA, Shinya OBARA, Ryuichi HIRAMOTO, So MATSUYA
  • Publication number: 20080069601
    Abstract: A developing roller comprising: a shaft comprising an aluminum alloy; and a coating layer directly formed on a periphery of the shaft, the coating layer comprising a conducting agent and a binder comprising a resin, wherein the aluminum alloy comprises 0.2 to 0.8% by mass of silicon and 0.05 to 1.5% by mass of maganese, based on the total mass of the aluminum alloy.
    Type: Application
    Filed: September 17, 2007
    Publication date: March 20, 2008
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Takeo Oshiba, Masahiro Anno, Okushi Okuyama, Satoshi Uchino, Shinya Obara, Ryuichi Hiramoto, So Matsuya
  • Publication number: 20080070147
    Abstract: An electrophotographic image forming method is disclosed. The method includes steps of conveying a developer comprising a toner to a developing zone by a developing roller, and developing an electrostatic latent image formed on an electrostatic latent image carrying member by the developer, and the developing roller has an electroconductive shaft and a resin layer provided around the shaft, the resin layer comprises a surface layer containing silicone copolymer resin as the principal component and a layer containing resin-silica hybrid composite as a principal component provided directly under the surface layer.
    Type: Application
    Filed: September 6, 2007
    Publication date: March 20, 2008
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Satoshi UCHINO, Masahiro ANNO, Takeo OSHIBA, Okushi OKUYAMA, Shinya OBARA
  • Publication number: 20070269240
    Abstract: An objective is to provide a developing roller in which increase of residual potential is inhibited during repetitive operation without deteriorating adhesion to an elastic layer, scattering and leakage of toner are prevented, appropriate elasticity is exhibited and a resin layer capable of preventing uneven charging of toner and image unevenness is prepared, and also to provide a image forming method employing the developing roller. Disclosed is a developing roller possessing an elastic layer made of silicone rubber provided around a conductive shaft, and a resin layer further provided on the elastic layer, wherein the resin layer contains polyurethane resin-silica hybrid as a principal component.
    Type: Application
    Filed: March 2, 2007
    Publication date: November 22, 2007
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Satoshi UCHINO, Nobuaki KOBAYASHI, Takeo OSHIBA, Okushi OKUYAMA, Kouichi SUGAMA
  • Publication number: 20070269239
    Abstract: An objective is to provide a developing roller in which increase of residual potential is inhibited during repetitive operation without deteriorating interlayer adhesion, and prepared is a layer immediately below the surface capable of preventing fog caused by toner scattering, accompanied with a surface layer capable of preventing stains formed from foreign matters adhered to the surface, as well as preventing image unevenness since toner electrification is even under the presence of appropriate elasticity, and also to provide a image forming method employing the developing roller. Disclosed is a developing roller possessing an elastic layer made of silicone rubber provided around a conductive shaft, and a plurality of resin layers further provided on the elastic layer, wherein an outermost surface layer among the resin layers comprises silicone copolymerization polyurethane; and a layer immediately below the surface layer comprises a polyurethane resin-silica hybrid.
    Type: Application
    Filed: February 23, 2007
    Publication date: November 22, 2007
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Satoshi UCHINO, Nobuaki KOBAYASHI, Takeo OSHIBA, Okushi OKUYAMA, Kouichi SUGAMA
  • Publication number: 20070147907
    Abstract: Provided are a developing roller for non-magnetic single component development and a developing method employing the developing, by which toner can be stably conveyed in any external environment, and the stable toner conveyance and charging amount can also be acquired. Also disclosed is a developing roller possessing a spindle and provided around an outer circumference of the spindle, at least an elastic layer (innermost layer), a resistance adjusting layer (intermediate layer) formed on the elastic layer and a surface layer (outermost layer) formed on the resistance adjusting layer, wherein the intermediate layer possesses a layer containing carbon black in a resin, a content of a polycyclic aromatic hydrocarbon in the carbon black is at most 10 ppm, and a volume resistance (Rv) of all the layers provided around the outer circumference of the spindle is 1.0×107-1.0×1013 ?·cm.
    Type: Application
    Filed: October 24, 2006
    Publication date: June 28, 2007
    Inventors: Kouichi Sugama, Nobuaki Kobayashi, Takeo Oshiba, Okushi Okuyama, Satoshi Uchino
  • Patent number: 7220526
    Abstract: An image forming method which can provides excellent cleaning property, no occurrence of unusual noise or curling of a blade, and a high quality image. The method includes forming a latent image on a cylindrical electrophotographic photoconductor including a mass additive therein; and developing the latent image with a developer comprising a toner, wherein the toner comprises a ratio (Dv50/Dp50) of a 50% volume particle size (Dv50) to a 50% number particle size (Dp50) of 1.0 to 1.15, a ratio (Dv75/Dp75) of a cumulative 75% volume particle size (Dv75) from a larger volume particle size to a cumulative 75% number particle size (Dp75) from a larger number particle size of 1.0 to 1.20, and the number of toner particles having a particle size of 0.7×(Dp50) or less in an amount of not greater than 10 number %.
    Type: Grant
    Filed: March 15, 2004
    Date of Patent: May 22, 2007
    Assignee: Konica Minolta Holdings, Inc.
    Inventors: Takeo Oshiba, Masao Asano, Hiroshi Yamazaki
  • Patent number: 7078142
    Abstract: An image forming method is disclosed. The method comprises processes in which a latent image on an electrophotographic photoreceptor is developed employing a developer material, and after transferring the visualized toner image to a recording material, the remaining toner on said photoreceptor is removed employing an elastic body cleaning blade. The electrophotographic photoreceptor comprises a surface layer containing a charge transportable polysiloxane hardenable resin, and said developer material comprises a fatty acid metal salt.
    Type: Grant
    Filed: May 21, 2002
    Date of Patent: July 18, 2006
    Assignee: Konica Corporation
    Inventors: Akihiko Itami, Tomoo Sakimura, Takeo Oshiba, Yohko Kitahara, Masahiko Kurachi, Kazuhisa Shida
  • Patent number: 7074539
    Abstract: An electrophotographic photoreceptor is disclosed. The charge transport material comprising a mixture of stereoisomers as a charge transport material and glass transition point Tgb of the binder resin of the charge transport layer and glass transition point Tgl of the charge transport layer satisfy 100° C.<Tgl1<Tgb(both Tgb and Tgl in ° C.). An image forming method employing the photoreceptor is also disclosed.
    Type: Grant
    Filed: August 25, 2004
    Date of Patent: July 11, 2006
    Assignee: Konica Corporation
    Inventors: Toyoko Shibata, Naoto Abe, Akihiko Itami, Takeo Oshiba