Patents by Inventor Hiroshi Yoshizawa

Hiroshi Yoshizawa 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).

  • System, apparatus, and method for preventing access to information stored in a consumable item of an image forming apparatus
    Patent number: 7292794
    Abstract: An image forming apparatus having a recognizing member configured to read a property stored in a memory member of a consumable item via a communication member, and to recognize if the consumable item can be used. The image forming apparatus also includes a property changing member configured to communicate to the memory member and to change a parameter so that information stored in the memory member cannot be accessed when the recognizing member recognizes the consumable item can be no longer used.
    Type: Grant
    Filed: March 18, 2005
    Date of Patent: November 6, 2007
    Assignee: Ricoh Company Ltd.
    Inventor: Hiroshi Yoshizawa
  • Optical-scanning apparatus and image forming apparatus
    Publication number: 20070252077
    Abstract: An optical-scanning apparatus is disclosed. In at least one embodiment, the optical-scanning apparatus includes a light deflector to deflect a beam from a light source; and an optical housing including a scanning-image optical system to focus the beam to scan a photo conductive photo receptor therewith as a light spot. The optical housing includes a collection member to collect particulate materials. The collection member includes a structure combining or overlapping plural sheet-shaped members, each including a highly-chargeable electrostatic absorption filter. Alternatively, the collection member includes an electrostatic absorption filter and a breathable sheet-shaped member covering almost all the surface of the electrostatic absorption filter.
    Type: Application
    Filed: April 26, 2007
    Publication date: November 1, 2007
    Inventors: Katsunori Shoji, Takeshi Yamakawa, Hiroshi Yoshizawa
  • Non-Aqueous Electrolyte Secondary Batery
    Publication number: 20070243463
    Abstract: A non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode and a non-aqueous electrolyte, wherein the non-aqueous electrolyte includes an onium compound, a lithium salt and a chain carbonate having a C?C unsaturated bond. The onium compound is preferably at least one selected from the group consisting of a chain quaternary ammonium compound, a pyrrolidinium compound and a piperidinium compound. The chain carbonate having a C?C unsaturated bond is preferably at least one selected from the group consisting of diallyl carbonate and allyl phenyl carbonate.
    Type: Application
    Filed: August 29, 2005
    Publication date: October 18, 2007
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tooru Matsui, Masaki Deguchi, Hiroshi Yoshizawa
  • Non-aqueous electrolyte secondary battery
    Publication number: 20070231705
    Abstract: A non-aqueous electrolyte secondary battery including a unit cell including a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte, the positive electrode capacity being greater than the negative electrode capacity, and at least a portion of the non-aqueous electrolyte is gasified during charging.
    Type: Application
    Filed: March 30, 2007
    Publication date: October 4, 2007
    Inventors: Tsutomu Ohzuku, Hiroshi Yoshizawa
  • NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY
    Publication number: 20070224516
    Abstract: The non-aqueous electrolyte secondary battery of the present invention includes a positive electrode containing a lithium-containing transition metal oxide as a positive electrode active material, a negative electrode, a separator interposed between the positive electrode and the negative electrode and a non-aqueous electrolyte. The non-aqueous electrolyte includes a non-aqueous solvent and a solute dissolved therein, and the non-aqueous solvent includes a solvent having an electron-withdrawing substituent. The solvent having an electron-withdrawing substituent includes at least one selected from the group consisting of a sulfonic solvent, a nitrile solvent, a ketonic solvent, a fluorine-containing solvent, a chlorine-containing solvent and a carboxylic acid ester solvent. The separator includes a material containing an electron-withdrawing substituent or an atom having an unshared electron pair.
    Type: Application
    Filed: March 22, 2007
    Publication date: September 27, 2007
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Masaki DEGUCHI, Tooru MATSUI, Hiroshi YOSHIZAWA
  • NonAqueous Electrolyte Secondary Battery
    Publication number: 20070218370
    Abstract: A non-aqueous electrolyte secondary battery including a positive electrode and a negative electrode each capable of absorbing and desorbing lithium, a separator interposed therebetween, and a non-aqueous electrolyte, wherein the positive electrode includes a positive electrode active material represented by: LiM1-xLxO2 where 0.005?x?0.1 is satisfied, M is at least one selected from the group consisting of Mn, Co and Ni, and L is at least one selected from the group consisting of Mg, Al, Ti, Sr, Zn, B, Ca, Cr, Si, Ga, Sn, P, V, Sb, Nb, Ta, Mo, W, Zr, Y and Fe, and the non-aqueous electrolyte includes a phosphinate compound represented by: where R1, R2 and R3 are each independently an aryl group, or an alkyl group, an alkenyl group or an alkynyl group each having 1 to 5 carbon atoms.
    Type: Application
    Filed: March 31, 2005
    Publication date: September 20, 2007
    Inventors: Masaki Deguchi, Tooru Matsui, Hiroshi Yoshizawa, Masamichi Onuki, Shinichi Kinoshita
  • Positive electrode active material and non-aqueous electrolyte secondary battery containing the same
    Publication number: 20070207383
    Abstract: The present invention relates to a positive electrode active material comprising a lithium-containing composite oxide containing nickel with an oxidation state of 2.0 to 2.5 and manganese with an oxidation state of 3.5 to 4.0, the oxidation state determined by the shifts of energy at which absorption maximum is observed in the X-ray absorption near-K-edge structures, and to a non-aqueous electrolyte secondary battery using the same, the positive electrode active material being characterized in having a high capacity, a long storage life and excellent cycle life.
    Type: Application
    Filed: May 1, 2007
    Publication date: September 6, 2007
    Applicant: Osaka City University
    Inventors: Tsutomu Ohzuku, Hiroshi Yoshizawa, Masatoshi Nagayama
  • Non-aqueous electrolyte secondary battery, negative electrode thereof, and method for manufacturing negative electrode
    Publication number: 20070202408
    Abstract: A negative electrode for a non-aqueous electrolyte secondary battery includes a current collector, a first layer and a second layer. The first layer is provided on the current collector and includes at least any one of alkaline metals and alkaline earth metals. The second layer is provided on the first layer, and includes an active material capable of absorbing and desorbing lithium ions having a barrier function of blocking ingress of gas.
    Type: Application
    Filed: February 23, 2007
    Publication date: August 30, 2007
    Inventors: Shinji Nakanishi, Hizuru Koshina, Hiroshi Yoshizawa
  • Non-aqueous electrolyte rechargeable battery
    Patent number: 7255963
    Abstract: A non-aqueous electrolyte rechargeable battery including: (a) a positive electrode capable of charging and discharging lithium; (b) a negative electrode capable of charging and discharging lithium; (c) a separator or a lithium ion conductive layer interposed between the positive electrode and the negative electrode; and (d) a lithium ion conductive non-aqueous electrolyte, wherein the positive electrode contains a mixture of a first positive electrode active material and a second positive electrode active material, the first positive electrode active material includes lithium oxide containing manganese, the lithium oxide further contains aluminum and/or magnesium, and the second positive electrode active material includes LixCo1-y-zMgyAlzO2 where 1?x?1.03, 0.005?y?0.1 and 0.001?z<0.02.
    Type: Grant
    Filed: December 9, 2003
    Date of Patent: August 14, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masatoshi Nagayama, Hiroshi Yoshizawa
  • Image forming apparatus, optical writing device, and housing molding method providing simple structure
    Publication number: 20070165099
    Abstract: An image forming apparatus includes an electrostatic latent image carrier, and an optical writing device including at least one light source, at least one aperture, at least one light shield, a light deflector, an image forming lens, and a housing. The aperture adjusts a light beam generated by the light source into a reference shape. The light shield shields an optical path formed between the light source and the aperture by the light beam. The light deflector deflects the light beam to scan in a main scanning direction. The image forming lens focuses the deflected light beam to scan on the surface of the electrostatic latent image carrier to form an electrostatic latent image on the surface of the electrostatic latent image carrier. The housing contains the light source, the light deflector, and the image forming lens. The housing is integrally molded with the aperture and the light shield.
    Type: Application
    Filed: December 22, 2006
    Publication date: July 19, 2007
    Inventors: Hiroshi Yoshizawa, Takeshi Yamakawa, Katsunori Shoji
  • Optical writing unit and an image forming apparatus including the same
    Publication number: 20070139745
    Abstract: An optical writing unit, e.g., that can be included in an image forming apparatus includes a housing within which are disposed additional components of the optical writing unit including the following, a plurality of optical elements, a polygon mirror configured to deflect a laser light beam, and a collecting member configured to collect dust in the housing.
    Type: Application
    Filed: December 15, 2006
    Publication date: June 21, 2007
    Inventors: Katsunori Shoji, Takeshi Yamakawa, Hiroshi Yoshizawa
  • Image processing apparatus having enhanced controlling process for optical scanning unit
    Publication number: 20070134023
    Abstract: An optical scanning unit of an image forming apparatus may include: an optical housing configured to include at least one optical part and to have a light-beam emitting aperture through which a light beam can emanate from the optical housing; a shutter configured to cover the light-beam emitting aperture; and a driving unit configured to drive the shutter to and fro, thus opening and closing the light-beam emitting aperture. Such a driving unit further can operate to coordinate at least one of the opening and the closing to occur after activation and before deactivation of a writing operation conducted by the optical scanning unit, respectively.
    Type: Application
    Filed: November 29, 2006
    Publication date: June 14, 2007
    Inventors: Katsunori Shoji, Takeshi Yamakawa, Hiroshi Yoshizawa
  • Image forming apparatus and optical scanning unit
    Publication number: 20070122192
    Abstract: An optical scanning unit may include a light source unit configured to emit a light beam, an optical housing configured to receive and support the light source unit, an optical device configured to deflect the light beam and to focus the light beam on a light receiving member, and a fixing member configured to fix the light source unit to the optical housing by applying pressure to the light source unit, wherein the pressure is applied in a direction, which is substantially perpendicular to an optical axis direction of the light source unit.
    Type: Application
    Filed: November 30, 2006
    Publication date: May 31, 2007
    Inventors: Takeshi Yamakawa, Hiroshi Yoshizawa, Katsunori Shoji
  • Electric double layer capacitor
    Patent number: 7209342
    Abstract: A phosphazene compound and an ionic liquid are added to a non-aqueous electrolyte to provide a less flammable electric double layer capacitor in which decline in storage characteristics under a high temperature and deterioration under a high charging voltage are suppressed.
    Type: Grant
    Filed: October 5, 2005
    Date of Patent: April 24, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tooru Matsui, Masaki Deguchi, Hiroshi Yoshizawa
  • Optical scanning device and image forming apparatus
    Publication number: 20070070173
    Abstract: An optical scanning device outputs a light beam from a light source through an emission window in an optical housing to scan a surface to be scanned. The optical scanning device includes a shutter member that closes or opens the emission window.
    Type: Application
    Filed: September 25, 2006
    Publication date: March 29, 2007
    Inventors: Takeshi Yamakawa, Hiroshi Yoshizawa, Katsunori Shoji, Masanori Namba
  • Image forming apparatus
    Publication number: 20070046766
    Abstract: An image forming apparatus in which image deterioration is unlikely to occur even if dirt attaches to the polygon mirror surface over time and reflectance is reduced, the image forming apparatus comprising light source units, an optical deflector for deflectively scanning light beams from the light source units, an optical writer comprising an optical system for guiding the light from the optical deflector onto the surface to be scanned of image carriers and forming an image thereon, and memory device for storing a plurality of shading correction data in advance.
    Type: Application
    Filed: August 17, 2006
    Publication date: March 1, 2007
    Inventors: Rumiko Ono, Hiroshi Yoshizawa
  • Method of Preparing Positive Electrode Active Material
    Publication number: 20070009424
    Abstract: A positive electrode active material for a non-aqueous electrolyte battery comprising a lithium-containing transition metal oxide, produced with the use of a dry precursor obtained by: introducing an alkaline solution together with an aqueous solution containing two or more of transition metal salts or two kinds or more of aqueous solutions of different transition metal salts into a reaction vessel to obtain a hydroxide or an oxide as a precursor through coprecipitation with a reductant being coexistent or an inert gas being supplied; and drying the precursor at 300 to 500° C. to obtain a dry precursor.
    Type: Application
    Filed: September 14, 2006
    Publication date: January 11, 2007
    Applicants: OSAKA CITY UNIVERSITY, MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Tsutomu Ohzuku, Hiroshi Yoshizawa, Masatoshi Nagayama
  • Method of producing positive electrode active material for non-aqueous electrolyte secondary battery
    Patent number: 7157186
    Abstract: A method of producing a positive electrode active material for a non-aqueous electrolyte secondary battery, comprising the steps of: (a) preparing a raw material mixture, comprising “nx” mol of magnesium, “ny” mol of an element M where the element M is at least one selected from the group consisting of Al, Ti, Sr, Mn, Ni and Ca, “n(1?x?y)” mol of cobalt and “nz” mol of lithium, such that the values n, x, y and z satisfy 0<n, 0.97?(1/z)?1, 0.005?x?0.1, and 0.001?y?0.03; and (b) baking the raw material mixture in an oxidization atmosphere at 1000 to 1100° C.
    Type: Grant
    Filed: January 5, 2004
    Date of Patent: January 2, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masatoshi Nagayama, Hiroshi Yoshizawa
  • Optical scanner and image forming apparatus using the same
    Patent number: 7149021
    Abstract: An optical scanner for an image forming apparatus of the present invention includes a polygonal mirror for steering a scanning beam incident thereto and an optical device located in the vicinity of the polygonal mirror. The polygonal mirror and optical device are supported by a housing. A heat radiation guide adjoins the polygonal mirror and is formed integrally with or separately from the housing. The heat radiation guide has a guide surface inclined relative to the axis of rotation of the polygonal mirror and intersecting a plane virtually formed by a scanning beam.
    Type: Grant
    Filed: June 25, 2004
    Date of Patent: December 12, 2006
    Assignee: Ricoh Company, Ltd.
    Inventor: Hiroshi Yoshizawa
  • Positive electrode active material, production method thereof and non-aqueous electrolyte secondary battery
    Publication number: 20060275664
    Abstract: In order to provide a 3V level non-aqueous electrolyte secondary battery with a flat voltage and excellent cycle life at a high rate with low cost, the present invention provides a positive electrode represented by the formula: Li2±?[Me]4O8?x, wherein 0??<0.4, 0?x<2, and Me is a transition metal containing Mn and at least one selected from the group consisting of Ni, Cr, Fe, Co and Cu, said active material exhibiting topotactic two-phase reactions during charge and discharge.
    Type: Application
    Filed: May 11, 2006
    Publication date: December 7, 2006
    Inventors: Tsutomu Ohzuku, Hiroshi Yoshizawa, Masatoshi Nagayama, Hizuru Koshina