Patents by Inventor Kuniaki Nakano

Kuniaki Nakano 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: 7548709
    Abstract: A transfer unit includes: an intermediate transfer belt that (i) holds a toner image that has been transferred from a photoreceptor drum and (ii) moves a surface holding the toner image; and a secondary transfer belt that comes into contact with the intermediate transfer belt. The transfer unit (i) transfers the toner image from the intermediate transfer belt to a sheet conveyed to the secondary transfer part and (ii) includes a cleaning unit that removes and collects toner from the surface of the intermediate transfer belt. The transfer unit also includes a power source for sequentially applying, to the secondary transfer belt, (i) a first voltage for generating an electric field that transfers normally-charged toner from the secondary transfer belt to the intermediate transfer belt and (ii) a second voltage for generating an electric field that transfers oppositely-charged toner from the secondary transfer belt to the intermediate transfer belt.
    Type: Grant
    Filed: April 26, 2006
    Date of Patent: June 16, 2009
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masashi Hirai, Kuniaki Nakano, Masanori Yamada, Takahiko Yoshida, Kazuaki Ishikawa, Hiroshi Tachiki, Toshio Yamanaka
  • Publication number: 20090072741
    Abstract: To provide a ceramic metal halide lamp having a rated lamp wattage of not less than 450 W, which will not cause flicker due to instable arc during operating of the lamp and early blacking of an arc tube.
    Type: Application
    Filed: February 17, 2006
    Publication date: March 19, 2009
    Applicant: GS YUASA CORPORATION
    Inventors: Kazuhiko Kawasaki, Shinji Taniguchi, Kuniaki Nakano
  • Patent number: 7486922
    Abstract: A fixing device is provided with a fixing roller for fixing a toner image transferred on a sheet to the sheet, and a separating mechanism for separating the sheet from the fixing roller. The separating mechanism includes a claw member having a tip portion held in contact with the outer circumferential surface of the fixing roller for separating the sheet from the fixing roller, a supporting member pivotably supporting the claw member, and a biasing member for biasing the claw member toward the outer circumferential surface of the fixing roller so that the tip portion of the claw member presses the fixing roller.
    Type: Grant
    Filed: November 21, 2006
    Date of Patent: February 3, 2009
    Assignee: Kyocera Mita Corporation
    Inventors: Kuniaki Nakano, Yoshiharu Kanematsu, Shinichi Uchida
  • Publication number: 20080246828
    Abstract: An ion generating device provided in an image forming apparatus of the present invention as a charging device for charging before a first transfer, a charging device for charging before a second transfer, or a charge device for charging an electrostatic latent image is arranged such that a discharge electrode can move with respect to a dielectric material and the relative positions of the discharge electrode and the dielectric material can be changed. This makes it possible to provide: a long-life ion generating device whose life has been extended by making effective use of a dielectric material; and an image forming apparatus including the ion generating device.
    Type: Application
    Filed: April 4, 2008
    Publication date: October 9, 2008
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Masashi HIRAI, Kuniaki NAKANO, Kazuaki ISHIKAWA
  • Patent number: 7418234
    Abstract: A discharge unit is disposed downstream of a principal transport path of a compound machine, and a shifter function is provided in this discharge unit. By shifting the paper passage position relative to a photosensitive drum when printing the front side and the paper passage position relative to the photosensitive drum when printing the back side, the region in which the surface electric potential of the photosensitive drum increases is diminished, and the region in which photographic fog is generated is made smaller. Thus, when printing the second and subsequent sheets, even when a slight amount of displacement of the transport position of the recording paper occurs, it is possible to suppress that recording paper making contact in the photographic fog region on the photosensitive drum, and defective printing can be prevented.
    Type: Grant
    Filed: April 9, 2004
    Date of Patent: August 26, 2008
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Susumu Murakami, Minoru Tomiyori, Hideshi Izumi, Takahisa Narikiyo, Kuniaki Nakano, Yoshie Iwakura
  • Patent number: 7415218
    Abstract: In an image forming apparatus that uses a charging unit to charge a photosensitive drum, forms an electrostatic latent image by carrying out image exposure according to image information, and transfers to a paper the electrostatic latent image by developing the electrostatic latent image into a visible image using a developer so that the image information is presented, an exhaust duct 33 for exhausting air that contains ozone produced within a drum unit 30, which includes a photosensitive drum 3 and a charging unit 5, and a duct 32 for taking in air, which draws in fresh air, are provided within the drum unit 30 so that ventilation of the drum unit 30 can be carried out with excellent efficiency.
    Type: Grant
    Filed: July 5, 2005
    Date of Patent: August 19, 2008
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takashi Hori, Kuniaki Nakano, Tomohiko Fujii, Yoshie Iwakura
  • Patent number: 7398041
    Abstract: A color image forming apparatus 1 includes: a multiple number of process printing units 20, each having an photoreceptor drum 21 for bearing a developer image formed with a toner corresponding to a different color of color-separated image information; a transfer belt 31 to which a multiple number of developer images are comprised in layers; and a transfer roller 36 for transferring the developer images that have been comprised in layers on transfer belt 31, all at once, to recording paper, wherein the multiple number of process printing units 20 are arranged along transfer belt 31, and is characterized in that among the developer images to be transferred from the photoreceptor drums 21 of multiple image forming units 20 onto transfer belt 31, the toner for the developer image of the color to be transferred first is specified to produce a base-layer of the color images of information.
    Type: Grant
    Filed: September 6, 2005
    Date of Patent: July 8, 2008
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yoshie Iwakura, Susumu Murakami, Kuniaki Nakano
  • Patent number: 7392007
    Abstract: A cleaning blade for removing residual toner left on the surface of an intermediate transfer belt after the second transfer is supported integrally with movement of a tension roller. In the case where the tension roller moves to make a tension of the intermediate transfer belt constant, then, following this, the cleaning blade moves. Thus, the contact state of the cleaning blade with respect to the surface of the intermediate transfer belt is kept constant, and thus cleaning of the intermediate transfer belt can be performed stably.
    Type: Grant
    Filed: October 15, 2004
    Date of Patent: June 24, 2008
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kuniaki Nakano, Takahiro Fukunaga, Susumu Murakami
  • Publication number: 20080044762
    Abstract: A radio graphic image conversion panel containing a substrate having thereon a phosphor layer formed by a vapor-accumulating method, wherein the phosphor layer has a thickness distribution of not more than ±20%, the thickness distribution being defined by the formula: ((Dmax?Dmin)/(Dmax+Dmin))×100, provided that Dmax is a maximum thickness of the phosphor layer; and Dmin is a minimum thickness of the phosphor layer.
    Type: Application
    Filed: August 17, 2007
    Publication date: February 21, 2008
    Inventors: Hideki Shibuya, Kuniaki Nakano, Shigetami Kasai
  • Patent number: 7330686
    Abstract: A color image forming apparatus includes: a multiple number of process printing units, each having an photoreceptor drum for supporting a developer image formed with a developer corresponding to each color of color-separated image information; a transfer belt to which the developer images formed on the photoreceptor drums are transferred; and a transfer roller for transferring the transferred developer image to recording paper, and is constructed so that the transfer belt is formed of a material which makes it possible for the transfer belt to attenuate the voltage charged thereon by 1,000 V or greater while it moves from a position where secondary transfer is performed to a position where the initial primary transfer is performed.
    Type: Grant
    Filed: September 27, 2005
    Date of Patent: February 12, 2008
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kuniaki Nakano, Yoshie Iwakura, Susumu Murakami
  • Patent number: 7305207
    Abstract: A cleaning system includes a rotating member and a cleaning blade which is forced against a curved outer surface of the rotating member to scrape off matter to be removed (toner) which is present along the outer surface of the rotating member. The cleaning blade has greater hardness than the outer surface of the rotating member.
    Type: Grant
    Filed: February 22, 2005
    Date of Patent: December 4, 2007
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Susumu Murakami, Yoshie Iwakura, Kuniaki Nakano
  • Patent number: 7282310
    Abstract: A radiographic image conversion panel containing a substrate having thereon a phosphor layer formed by a vapor-accumulating method, wherein the phosphor layer has a thickness distribution of not more than ±20%, the thickness distribution being defined by the formula: ((Dmax?Dmin)/(Dmax+Dmin))×100, provided that Dmax is a maximum thickness of the phosphor layer; and Dmin is a minimum thickness of the phosphor layer.
    Type: Grant
    Filed: November 7, 2006
    Date of Patent: October 16, 2007
    Assignee: Konica Minolta Medical & Graphic, Inc.
    Inventors: Hideki Shibuya, Kuniaki Nakano, Shigetami Kasai
  • Patent number: 7280788
    Abstract: An image forming apparatus according to the present invention is provided with a plurality of image bearing members, an intermediate transfer member, a plurality of first transfer devices, a second transfer device, and a charge amount adjustment section. The image bearing members carry images of respective colors. The intermediate transfer member is rotatably disposed at a position opposed to the image bearing members. The first transfer devices form a full-color toner image on the intermediate transfer member by transferring color toner images formed on the image bearing members to the intermediate transfer member. The second transfer device transfers the full-color toner image formed on the intermediate transfer member to a recording sheet. The charge amount adjustment section adjusts the charge amount of toner particles constituting the full-color toner image so as to reduce non-uniformity in a charge amount of toner particles of the full-color toner image on the intermediate transfer member per unit area.
    Type: Grant
    Filed: September 21, 2005
    Date of Patent: October 9, 2007
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yoshie Iwakura, Kuniaki Nakano
  • Patent number: 7254359
    Abstract: A transfer apparatus and an image forming apparatus are disclosed, in which a plurality of photosensitive drums corresponding to the respective colors are arranged along the outer peripheral surface of a transfer belt and a plurality of intermediate transfer rollers for applying a transfer field to the photosensitive drums are arranged offset downstream side from each of the photosensitive drums, respectively. In addition to that, the process, the intermediate transfer rollers are arranged in such positions that each of the nip width are increased progressively downstream side, respectively and each of the nip pressure are decreased progressively downstream side, respectively.
    Type: Grant
    Filed: February 7, 2005
    Date of Patent: August 7, 2007
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yoshie Iwakura, Susumu Murakami, Kuniaki Nakano
  • Publication number: 20070172263
    Abstract: A transfer device is provided including an intermediate transfer belt and transfer rollers associated with respective of photosensitive drums. Each of the transfer rollers and the intermediate transfer belt define therebetween a contact range of which center lies downstream of the center of a contact range (transfer nip region) defined between the associated photosensitive drum and the endless belt in the direction of movement of the endless belt. The transfer roller deforms the path of movement of the intermediate transfer belt by contacting the intermediate transfer belt, and the resulting deformation causes the intermediate transfer belt to contact the periphery of the photosensitive drum over a predetermined range.
    Type: Application
    Filed: April 2, 2007
    Publication date: July 26, 2007
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Susumu Murakami, Takahiro Fukunaga, Yoshie Iwakura, Kuniaki Nakano, Hideshi Izumi, Minoru Tomiyori
  • Patent number: 7245865
    Abstract: A transfer apparatus and an image forming apparatus capable of transferring an image satisfactorily using developing agent are disclosed. A transfer system includes photosensitive drums corresponding to the respective colors arranged along the outer peripheral surface of a transfer belt and intermediate transfer rollers arranged offset downstream side from the respective photosensitive drums for applying a transfer field to the respective photosensitive drums. The transfer belt is configured of a material such as polyimide or polycarbonate in which a surge current of not less than a specified value flows immediately after application of a transfer voltage.
    Type: Grant
    Filed: February 7, 2005
    Date of Patent: July 17, 2007
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yoshie Iwakura, Susumu Murakami, Kuniaki Nakano
  • Patent number: 7236713
    Abstract: In an image forming apparatus a primary transfer is carried out such that toner images on a plurality of photoreceptors are transferred and laminated onto an intermediate transfer member, and a recording paper and the intermediate transfer member are sandwiched between a secondary transfer roller disposed so as to be in contact with the intermediate transfer member and a secondary transfer counter roller disposed opposite to the secondary transfer roller, to carry out a secondary transfer that the toner images on the intermediate transfer member are transferred onto the recording paper. At the time, an electric field is applied to the recording paper, and further the secondary transfer counter roller is switched by a switch between grounded state and floating state so that a potential difference between the intermediate transfer member and the secondary transfer roller can be adjusted.
    Type: Grant
    Filed: July 29, 2005
    Date of Patent: June 26, 2007
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Susumu Murakami, Yoshie Iwakura, Kuniaki Nakano
  • Patent number: 7223989
    Abstract: A radiation image conversion panel is disclosed, comprising a support having thereon a stimulable phosphor layer formed by vapor deposition of a stimulable phosphor, wherein the stimulable phosphor layer meets the following requirement: 0?B?90A?0.17 wherein A is a thickness (?m) of the stimulable phosphor layer and B is a transmittance (%) of a stimulating light or a stimulated emission.
    Type: Grant
    Filed: October 12, 2004
    Date of Patent: May 29, 2007
    Assignee: Konica Minolta Medical & Graphic, Inc.
    Inventors: Kuniaki Nakano, Shigetami Kasai, Hideki Shibuya, Masashi Kondo
  • Publication number: 20070116498
    Abstract: A fixing device is provided with a fixing roller for fixing a toner image transferred on a sheet to the sheet, and a separating mechanism for separating the sheet from the fixing roller. The separating mechanism includes a claw member having a tip portion held in contact with the outer circumferential surface of the fixing roller for separating the sheet from the fixing roller, a supporting member pivotably supporting the claw member, and a biasing member for biasing the claw member toward the outer circumferential surface of the fixing roller so that the tip portion of the claw member presses the fixing roller.
    Type: Application
    Filed: November 21, 2006
    Publication date: May 24, 2007
    Applicant: Kyocera Mita Corporation
    Inventors: Kuniaki Nakano, Yoshiharu Kanematsu, Shinichi Uchida
  • Patent number: 7221883
    Abstract: A transfer device has a control circuit. The control circuit initiates supplying transfer power to one or more first transfer rollers and to a second transfer roller when a first transfer operation is initiated by a first transfer roller positioned most upstream with respect to a direction in which an intermediate transfer belt travels. The control circuit stops supplying the transfer power to the one or more first transfer rollers and to the second transfer roller when a second transfer operation is completed by the second transfer roller. The transfer power supplied to the one or more first transfer rollers and to the second transfer roller, respectively, is free from fluctuation during a period from the initiation of the first transfer operation performed first to the completion of the second transfer operation.
    Type: Grant
    Filed: December 22, 2004
    Date of Patent: May 22, 2007
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yoshie Iwakura, Susumu Murakami, Takahiro Fukunaga, Kuniaki Nakano, Hideshi Izumi, Minoru Tomiyori