Patents by Inventor Junko Nishiyama
Junko Nishiyama 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).
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Patent number: 7470494Abstract: According to the present invention, a magnetic toner comprising magnetic toner particles including at least a binder resin and magnetic particles is provided, wherein an isoelectric point of the magnetic particles is pH 4.0 or less, in order to provide a magnetic toner stably having an optimum charged amount regardless of environments so that a high-quality image having high blackness can be formed without causing any ghost phenomenon.Type: GrantFiled: June 29, 2005Date of Patent: December 30, 2008Assignee: Canon Kabushiki KaishaInventors: Junko Nishiyama, Yoshihiro Ogawa, Yusuke Hasegawa, Shinichiro Abe, Takashige Kasuya
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Patent number: 7457572Abstract: An image forming method and related process cartridge, the method having the steps of controlling the layer thickness of a toner on a toner bearing member by means of a toner regulating blade, and developing with the toner an electrostatic latent image formed on an electrostatic latent image bearing member, the toner regulating blade has, at its part to be kept in touch with the toner bearing member, a specific ten-point average roughness Rz and a specific ratio (area of contact portion/area of non-contact portion) at a specific face pressure, and the toner has a specific average circularity and has a specific aerated bulk density. This image forming method and process cartridge promise superior developing performance in any environment, can keep sleeve negative ghost from occurring and can keep toner melt adhesion to toner regulating blade and toner melt adhesion to toner bearing member from occurring.Type: GrantFiled: June 22, 2006Date of Patent: November 25, 2008Assignee: Canon Kabushiki KaishaInventors: Tsutomu Onuma, Yoshihiro Ogawa, Yusuke Hasegawa, Koji Nishikawa, Tomohisa Sano, Junko Nishiyama, Miho Okazaki, Takashige Kasuya
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Publication number: 20080124643Abstract: A toner is provided which can stably provide a favorable density stability, line reproducibility and dot reproducibility even in high-speed copying machines, printers and the like which form high resolution latent images over a long period regardless of environmental conditions, and can provide the image quality adaptable to embedded pattern printing, QR code printing and the like. The present invention is characterized in that the toner which includes toner particles including at least a binder resin and a colorant, and a fine silica powder, has a volume median diameter (D50) of not less than 0.70 ?m and not more than 3.00 ?m, and a total pore volume of not more than 0.200 cm3/g, measured in the range of the pore diameter from not less than 1.7 nm and not more than 300.0 nm.Type: ApplicationFiled: November 29, 2007Publication date: May 29, 2008Applicant: CANON KABUSHIKI KAISHAInventors: Daisuke Yoshiba, Katsuhisa Yamazaki, Syuhei Moribe, Junko Nishiyama, Shuichi Hiroko, Masami Fujimoto, Takashige Kasuya
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Patent number: 7368211Abstract: To provide a magnetic toner which is excellent in durability and developability even in the case of being applied to high-speed developing process or being used in a large-capacity process cartridge amount of toner in which is increased, and which has high degree of blackness. Provided is a magnetic toner having magnetic toner particles containing at least a binder resin and magnetic material particles each comprising a predetermined amount of a titanium compound, characterized in that: 1) the magnetic material particles have a predetermined amount of adsorbed moisture at a relative vapor pressure of 50%; and 2) a difference between the amount of moisture adsorbed to the magnetic material particles in an adsorbing process for increasing a relative vapor pressure and the amount of moisture adsorbed to the magnetic material particles in a desorbing process for reducing a relative vapor pressure is reduced.Type: GrantFiled: June 29, 2005Date of Patent: May 6, 2008Assignee: Canon Kabushiki KaishaInventors: Yusuke Hasegawa, Yoshihiro Ogawa, Shinichiro Abe, Junko Nishiyama, Takashige Kasuya
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Publication number: 20070059049Abstract: An image forming method having the steps of controlling the layer thickness of a toner on a toner bearing member by means of a toner regulating blade, and developing with the toner an electrostatic latent image formed on an electrostatic latent image bearing member, the toner regulating blade has, at its part to be kept in touch with the toner bearing member, a specific ten-point average roughness Rz and a specific ratio (area of contact portion/area of non-contact portion) at a specific face pressure, and the toner has a specific average circularity and has a specific aerated bulk density. This image forming method promises superior developing performance in any environment, can keep sleeve negative ghost from occurring and can keep toner melt adhesion to toner regulating blade and toner melt adhesion to toner bearing member from occurring.Type: ApplicationFiled: June 22, 2006Publication date: March 15, 2007Applicant: Canon Kabushiki KaishaInventors: Tsutomu Onuma, Yoshihiro Ogawa, Yusuke Hasegawa, Koji Nishikawa, Tomohisa Sano, Junko Nishiyama, Miho Okazaki, Takashige Kasuya
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Publication number: 20060263710Abstract: A magnetic toner including at least: a binder resin; and a magnetic body, in which, when magnetization at a magnetic field strength of 397.9 kA/m and a coercive force of the magnetic toner are denoted by ?s (Am2/kg) and Hc (kA/m), respectively, a magnetic field strength at which the magnetic toner shows a magnetization value equal to 95% of ?s is denoted by H95% (kA/m), and a number average particle size of the magnetic body is denoted by d (?m), H95%, Hc, and d satisfy the following expressions. 151<H95%<200??(1) 7.Type: ApplicationFiled: May 3, 2006Publication date: November 23, 2006Applicant: CANON KABUSHIKI KAISHAInventors: Yusuke Hasegawa, Yoshihiro Ogawa, Junko Nishiyama, Miho Okazaki, Takashige Kasuya, Tomohisa Sano
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Publication number: 20060240352Abstract: The invention is to provide a toner excellent in fixing property, high-temperature offset resistance and blocking resistance, and having an excellent developing property. The invention provides a toner including at least a binder resin and a colorant, wherein: the binder resin contains a hybrid resin which contains a polyester-type resin unit by 50 mass % or more and in which a polyester-type resin component and a vinyl-type resin component are chemically bonded; the toner contains 3 to 50 mass % of a tetrahydrofuran-insoluble matter derived from the binder resin; the tetrahydrofuran-insoluble matter contains a hybrid resin; and a tetrahydrofuran-soluble matter, obtained by hydrolyzing the tetrahydrofuran-insoluble matter and separating by filtration, has, in a GPC-measured molecular weight distribution, a main peak within a molecular weight range of 50,000 to 500,000.Type: ApplicationFiled: April 20, 2006Publication date: October 26, 2006Applicant: CANON KABUSHIKI KAISHAInventors: Yoshihiro Ogawa, Yusuke Hasegawa, Tomohisa Sano, Junko Nishiyama, Miho Okazaki, Takashige Kasuya, Koji Nishikawa
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Publication number: 20060078811Abstract: According to the present invention, a magnetic toner comprising magnetic toner particles including at least a binder resin and magnetic particles is provided, wherein an isoelectric point of the magnetic particles is pH 4.0 or less, in order to provide a magnetic toner stably having an optimum charged amount regardless of environments so that a high-quality image having high blackness can be formed without causing any ghost phenomenon.Type: ApplicationFiled: June 29, 2005Publication date: April 13, 2006Applicant: CANON KABUSHIKI KAISHAInventors: Junko Nishiyama, Yoshihiro Ogawa, Yusuke Hasegawa, Shinichiro Abe, Takashige Kasuya
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Publication number: 20060078812Abstract: To provide a magnetic toner which is excellent in durability and developability even in the case of being applied to high-speed developing process or being used in a large-capacity process cartridge amount of toner in which is increased, and which has high degree of blackness. Provided is a magnetic toner having magnetic toner particles containing at least a binder resin and magnetic material particles each comprising a predetermined amount of a titanium compound, characterized in that: 1) the magnetic material particles have a predetermined amount of adsorbed moisture at a relative vapor pressure of 50%; and 2) a difference between the amount of moisture adsorbed to the magnetic material particles in an adsorbing process for increasing a relative vapor pressure and the amount of moisture adsorbed to the magnetic material particles in a desorbing process for reducing a relative vapor pressure is reduced.Type: ApplicationFiled: June 29, 2005Publication date: April 13, 2006Applicant: CANON KABUSHIKI KAISHAInventors: Yusuke Hasegawa, Yoshihiro Ogawa, Shinichiro Abe, Junko Nishiyama, Takashige Kasuya
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Publication number: 20050266299Abstract: A drop of discharge or charge capacity in discharging or charging with a large current is reduced without changing a design of a lithium ion secondary battery itself. When the lithium ion secondary battery for a car or a vehicles such as an electric automobile and a hybrid automobile is discharged or charged with, for instance, a large current not less than 5C, an intermittent power feeding of repeatedly executing a power feeding (t2) and a pause (t1) is carried out.Type: ApplicationFiled: November 14, 2003Publication date: December 1, 2005Inventors: Junko Nishiyama, Chika Kanbe
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Publication number: 20040137333Abstract: This invention provides a lithium ion secondary battery comprising a cathode, an anode and an nonaqueous electrolytic solution in which an electrolyte is dissolved in a nonaqueous solvent, wherein the anode comprises a non-graphitizable carbon as an anode activator; and the nonaqueous electrolytic solution comprises at least one anode protecting component selected from the group consisting of sultones having a 5- to 7-membered cyclic sulfonate structure and their substituted derivatives as well as vinylene carbonates and their substituted derivatives.Type: ApplicationFiled: December 22, 2003Publication date: July 15, 2004Applicant: NEC CORPORATIONInventors: Junko Nishiyama, Tamaki Miura, Koji Utsugi