Patents by Inventor Teruaki Mitsuya

Teruaki Mitsuya 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: 6813462
    Abstract: A developing unit in an electro-photographic apparatus such as a printer, a facsimile and a copier for actualizing an image employing colored particles such as toner, and more particularly to a developing unit for forming a toner image on the surface of a photosensitive body. The developing unit includes a plurality of developing rollers each having a core and a sleeve. The sleeve accommodates the core. The plurality of developing rollers include a first developing roller and a second developing roller. The sleeve for the first developing roller is rotated to move in the same direction as a moving direction of the surface of the photosensitive body. The sleeve for the second developing roller is rotated to move in an opposite direction to the moving direction of the surface of the photosensitive body. The core of only one of the plurality of developing rollers is driven in rotation while the other core is fixed.
    Type: Grant
    Filed: January 27, 2003
    Date of Patent: November 2, 2004
    Assignee: Hitachi Printing Solutions, Ltd.
    Inventors: Teruaki Mitsuya, Tsuneaki Kawanishi, Masayoshi Ishii, Hisao Okada, Hiroyoshi Matsumoto, Keisuke Kubota, Natsuki Kuribayashi
  • Publication number: 20040179870
    Abstract: In an electrophotographic recording device, a multicolor toner image is formed by images in each color superimposed on one another. In order to detect image misalignment, image-forming units form a color registration detection pattern, and sensors detect the pattern and output detection signals. A control unit detects the position of the patterns based on only portions of the detection signals corresponding to leading edges of the patterns.
    Type: Application
    Filed: March 10, 2004
    Publication date: September 16, 2004
    Inventors: Teruaki Mitsuya, Hiroyuki Mabuchi, Toru Miyasaka, Mieko Ishii
  • Patent number: 6792235
    Abstract: A transfer flow-in current which flows from a transferring device into an image carrier, a separation flow-in current which flows from a separating device into the image carrier, an aperture width in the recording member transporting direction of an aperture of the transferring device, and an aperture width in the recording member transporting direction of an aperture of the separating device are set so as to have the relationship: separation flow-in current=transfer flow-in current×(transfer aperture width/separation aperture width).
    Type: Grant
    Filed: July 8, 2002
    Date of Patent: September 14, 2004
    Assignee: Hitachi Printing Solutions, Ltd.
    Inventors: Keisuke Kubota, Masayoshi Ishii, Teruaki Mitsuya, Hideki Ando
  • Patent number: 6760553
    Abstract: An electrophotographic cluster printing system for performing printing by using a plurality of electrophotographic recording apparatuses such as printers, facsimile machines or copying machines each capable of manifesting an image by using colored particles such as toner. The electrophotographic cluster printing system includes a plurality of electrophotograhic recording apparatuses each including a photoconductor, a charger, an exposure device, a developing device, and an image quality controller for detecting a factor concerning image quality and controlling image quality of an output image on the basis of information of the detected factor. In the system, at least two of the electrophotograhic recording apparatuses is used for printing one job and image quality of any one of the electrophotograhic recording apparatuses is controlled on the basis of detected information of the other electrophotograhic recording apparatuses.
    Type: Grant
    Filed: December 27, 2002
    Date of Patent: July 6, 2004
    Assignees: Hitachi Printing Solutions, Ltd., Hitachi, Ltd.
    Inventors: Teruaki Mitsuya, Keisuke Kubota, Masayoshi Ishii, Shintaro Yamada
  • Patent number: 6754464
    Abstract: In order to provide a miniature full-color recorder having an excellent color reproducibility and to provide a full-color recorder having a wider color reproduction range beyond the range of subtraction color mixing of three primary colors, first and second potential split developing processes are continuously arranged for one recording medium.
    Type: Grant
    Filed: April 17, 2002
    Date of Patent: June 22, 2004
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Teruaki Mitsuya, Yasuo Kikuchi, Akira Terakado, Kazuo Sakaki, Shinya Kobayashi, Akira Arimoto
  • Patent number: 6738586
    Abstract: A print control method of an electrophotograph in an image formation apparatus including at least a photoconductor, a charger, a light exposure unit, and a developing device for forming a background area and an image area on the photoconductor using the charger and the light exposure unit and detecting a potential of the image area after transfer and controlling a developing electric field, thereby printing an electrophotograph, includes lowering the percentage of toner covering the image area on the photoconductor when the potential is detected.
    Type: Grant
    Filed: February 8, 2002
    Date of Patent: May 18, 2004
    Assignee: Hitachi Printing Solutions, Ltd.
    Inventors: Keisuke Kubota, Teruaki Mitsuya, Hiroyuki Mabuchi, Masayoshi Ishii, Shinichi Akatsu
  • Publication number: 20040052541
    Abstract: A transfer member transporting section is disposed so as to bring a tip end of a transfer member into contact with a peripheral face of a transfer rotary member before the tip end of the transfer member enters a nip area. A bias power supply has a polarity inverting function of, during a period from a timing when the tip end of the transfer member is brought into contact with the transfer rotary member by the transfer member transporting section, to that when the tip end of the transfer member enters the nip area, applying a voltage of a polarity which is identical with that of a toner, to the transfer rotary member, and after the tip end of the transfer member enters the nip area, applying a voltage of a polarity which is opposite to that of the toner, to the transfer rotary member.
    Type: Application
    Filed: May 30, 2003
    Publication date: March 18, 2004
    Applicant: Hitachi Printing Solutions, Ltd.
    Inventors: Hiroyoshi Matsumoto, Teruaki Mitsuya, Tsuneaki Kawanishi, Hisao Okada, Natsuki Kuribayashi, Masayoshi Ishii, Keisuke Kubota
  • Patent number: 6686943
    Abstract: An image formation apparatus for keeping secularly stable image quality for all image patterns if change in the charge amount of a developer caused by environment variation or over time or change in the photoconductor characteristic occurs in electrophotographic record apparatus. A test patch image formed on a photoconductor by a parallel electric field is detected by an image density sensor, the developing bias and the photoconductor surface potential are controlled so that the density detected by the image density sensor becomes constant, a test patch image formed on the photoconductor by a peripheral electric field is detected by the image density sensor with the control condition of the image density sensor maintained, and the light application amount in which an image area of a several-dot width adjacent a blank paper part is exposed to light is controlled so that the density detected by the image density sensor becomes constant.
    Type: Grant
    Filed: July 12, 2002
    Date of Patent: February 3, 2004
    Assignees: Hitachi Printing Solutions, Ltd., Hitachi Ltd.
    Inventors: Masayoshi Ishii, Keisuke Kubota, Teruaki Mitsuya, Shintaro Yamada
  • Patent number: 6684036
    Abstract: An image forming apparatus restricts disturbance of a potential patch in the case where a potential sensor for detecting the potential patch is provided downstream of a developing device of a multiple developing roller type so as to enable stable reproduction of a high quality image for a long period. The apparatus includes a potential sensor provided downstream in the moving direction of the image carrier relative to the developing device for detecting a potential on the image carrier, and a controller for setting the developing bias to a value restricting disturbance of a potential portion as an object for potential detection by the potential sensor by the developer when the potential portion passes across the developing device.
    Type: Grant
    Filed: March 8, 2002
    Date of Patent: January 27, 2004
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Keisuke Kubota, Teruaki Mitsuya, Hiroyuki Mabuchi, Masayoshi Ishii, Shinichi Akatsu
  • Publication number: 20030228180
    Abstract: A cooling device used in an electrophotographic image forming device includes a cooling roller, which is a heat roller, and a backup roller pressed against the cooling roller to form a nip portion therebetween. After discharged from a fixing device that thermally fixes a toner image onto a recording sheet, the recording sheet passes through the nip portion, whereby the cooling roller cools the recording sheet. The cooling roller is maintained at 100° C. or greater.
    Type: Application
    Filed: June 3, 2003
    Publication date: December 11, 2003
    Inventors: Teruaki Mitsuya, Takashi Suzuki, Heigo Ueki, Daisuke Hara
  • Publication number: 20030143001
    Abstract: A developing unit in an electro-photographic apparatus such as a printer, a facsimile and a copier for actualizing an image employing colored particles such as toner, and more particularly to a developing unit for forming a toner image on the surface of a photosensitive body. The developing unit includes a plurality of developing rollers each having a core and a sleeve. The sleeve accommodates the core. The plurality of developing rollers include a first developing roller and a second developing roller. The sleeve for the first developing roller is rotated to move in the same direction as a moving direction of the surface of the photosensitive body. The sleeve for the second developing roller is rotated to move in an opposite direction to the moving direction of the surface of the photosensitive body. The core for at least one of the plurality of developing rollers is driven in rotation.
    Type: Application
    Filed: January 27, 2003
    Publication date: July 31, 2003
    Applicant: HITACHI PRINTING SOLUTIONS, LTD.
    Inventors: Teruaki Mitsuya, Tsuneaki Kawanishi, Masayoshi Ishii, Hisao Okada, Hiroyoshi Matsumoto, Keisuke Kubota, Natsuki Kuribayashi
  • Publication number: 20030128993
    Abstract: An electrophotographic cluster printing system for performing printing by using a plurality of electrophotographic recording apparatuses such as printers, facsimile machines or copying machines each capable of manifesting an image by using colored particles such as toner. The electrophotographic cluster printing system includes a plurality of electrophotograhic recording apparatuses each including a photoconductor, a charger, an exposure device, a developing device, and an image quality controller for detecting a factor concerning image quality and controlling image quality of an output image on the basis of information of the detected factor. In the system, at least two of the electrophotograhic recording apparatuses is used for printing one job and image quality of any one of the electrophotograhic recording apparatuses is controlled on the basis of detected information of the other electrophotograhic recording apparatuses.
    Type: Application
    Filed: December 27, 2002
    Publication date: July 10, 2003
    Applicant: Hitachi Printing Solutions, Ltd.
    Inventors: Teruaki Mitsuya, Keisuke Kubota, Masayoshi Ishii, Shintaro Yamada
  • Patent number: 6556229
    Abstract: In an electrophotographic apparatus, regions having at least three different potential levels Vc, Vw, and Vr are formed on a photosensitive member by using an exposing device, and developing processes respectively using colored particles of different kinds are performed by normal development and reversal development on two potential levels Vc and Vr excluding the intermediate potential level Vw. The apparatus has an auxiliary exposing unit for forming a fringe development preventing potential in an edge of an image forming region in order to prevent fringe development from occurring. The auxiliary exposing unit sets an auxiliary exposure amount by performing pulse-width modulation on a laser driver.
    Type: Grant
    Filed: April 13, 2001
    Date of Patent: April 29, 2003
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Teruaki Mitsuya, Nobuyoshi Hoshi, Hisao Okada, Yoshihiko Sano, Shinichi Akatsu, Shinya Kobayashi
  • Patent number: 6543360
    Abstract: A printing system is provided which ensures easy formation of a plate and regeneration of the plate for continued use. The press plate used in a the printing system to form an image using a water-based ink is characterized in that, (I) prior to formation of a latent image, the surface forming the latent image exhibits extra ink-repellency to the ink to be used; (2) the press plate allows a water soluble material forming the latent image to be deposited thereon; (3) the latent image can be formed by allowing the water soluble material to be deposited on the press plate surface; and (4) the press plate can be regenerated as a plate which allows a new latent image to be formed by washing the press plate with water and drying it, upon completion of ensuing processes of development and transfer.
    Type: Grant
    Filed: December 28, 2000
    Date of Patent: April 8, 2003
    Assignees: Hitachi, Ltd., Hitachi Koki Co., Ltd.
    Inventors: Hiroshi Sasaki, Mitsuyoshi Shouji, Kenichi Kawashima, Yutaka Ito, Teruaki Mitsuya, Nobuyoshi Hoshi
  • Publication number: 20030063915
    Abstract: A transfer flow-in current which flows from a transferring device into an image carrier, a separation flow-in current which flows from a separating device into the image carrier, an aperture width in the recording member transporting direction of an aperture of the transferring device, and an aperture width in the recording member transporting direction of an aperture of the separating device are set so as to have the relationship: separation flow-in current=transfer flow-in current×(transfer aperture width/separation aperture width).
    Type: Application
    Filed: July 8, 2002
    Publication date: April 3, 2003
    Applicant: Hitachi Koki Co., Ltd.
    Inventors: Keisuke Kubota, Masayoshi Ishii, Teruaki Mitsuya, Hideki Ando
  • Publication number: 20030012578
    Abstract: An image formation apparatus for keeping secularly stable image quality for all image patterns if change in the charge amount of a developer caused by environment variation or over time or change in the photoconductor characteristic occurs in electrophotographic record apparatus. A test patch image formed on a photoconductor by a parallel electric field is detected by an image density sensor, the developing bias and the photoconductor surface potential are controlled so that the density detected by the image density sensor becomes constant, a test patch image formed on the photoconductor by a peripheral electric field is detected by the image density sensor with the control condition of the image density sensor maintained, and the light application amount in which an image area of a several-dot width adjacent a blank paper part is exposed to light is controlled so that the density detected by the image density sensor becomes constant.
    Type: Application
    Filed: July 12, 2002
    Publication date: January 16, 2003
    Applicant: Hitachi Koki Co., Ltd.
    Inventors: Masayoshi Ishii, Keisuke Kubota, Teruaki Mitsuya, Shintaro Yamada
  • Patent number: 6487384
    Abstract: In an image forming apparatus for charging a photosensitive body, changing the light exposure amount in at least three levels at exposure to light, thereby forming an electrostatic image made up of a high-potential part, a low-potential part, and an intermediate-potential part therebetween on the photosensitive body, and normally developing and inversely developing the electrostatic image using toners different in charge polarity for forming two types of toner images on the photosensitive body, a first developer used with a first toner image developing unit has electric resistance changed within 10% in the change range of applied voltage to the developer as the difference between a surface potential of the photosensitive body and a developing bias voltage.
    Type: Grant
    Filed: April 6, 2001
    Date of Patent: November 26, 2002
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Hisao Okada, Hiroyuki Mabuchi, Teruaki Mitsuya, Shinya Kobayashi, Yasuo Takuma, Masayoshi Ishii, Hisayoshi Kato
  • Publication number: 20020150409
    Abstract: In order to provide a miniature full-color recorder excellent in color reproducibility and provides a full-color recorder having a wider color reproduction range beyond the range of subtraction color mixing of the three primary colors, the first and second potential split developing processes are continuously arranged for one recording medium.
    Type: Application
    Filed: April 17, 2002
    Publication date: October 17, 2002
    Inventors: Teruaki Mitsuya, Yasuo Kikuchi, Akira Terakado, Kazuo Sakaki, Shinya Kobayashi, Akira Arimoto
  • Publication number: 20020127488
    Abstract: In an image forming method, when viewed from the moving direction of a photosensitive body 1, there is disposed, on the upstream side, a first developing roller 61 opposed to and adjacent to the photosensitive body 1 and rotatable in the opposite direction to the photosensitive body 1, while the peripheral speed ratio of the roller 61 to the photosensitive body 1 ranges from 0.8 to 2.0; on the downstream side of the roller 61, there is disposed a second developing roller 62 rotatable in the same direction to the photosensitive body 1, while the peripheral speed ratio of the roller 62 to the photosensitive body 1 ranges from 1.05 to 2.0; and the shape coefficient SF1 of the toners of two-component developing agent ranges from 120 to 170, while the shape coefficient SF2 ranges from 110 to 130.
    Type: Application
    Filed: December 26, 2001
    Publication date: September 12, 2002
    Inventors: Katsuhiko Suzuki, Masami Ishikawa, Tsuneaki Kawanishi, Teruaki Mitsuya, Hisao Okada, Masayoshi Ishii
  • Publication number: 20020127026
    Abstract: In a print control method of an electrophotograph and an image formation apparatus thereof, a surface potential sensor is placed in a post-transfer area and at the position, the potential on the photoconductor drum surface at the developing point is detected. When the potential on the photoconductor drum surface is detected, the developing bias is avoided at the optimum timing and the potential is detected at the position after transfer. The correction potential amount grasped based on the in-machine humidity and the photoconductor drum film thickness previously measured is added to the detected potential and the potential on the photoconductor drum surface at the developing point is reproduced. Feedback control is applied to the potential on the photoconductor drum surface, whereby the developing potential on the photoconductor drum surface is kept stable.
    Type: Application
    Filed: February 8, 2002
    Publication date: September 12, 2002
    Inventors: Keisuke Kubota, Teruaki Mitsuya, Hiroyuki Mabuchi, Masayoshi Ishii, Shinichi Akatsu