Patents by Inventor Masataka Naito

Masataka Naito 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: 10599063
    Abstract: In a state where a developer borne by a developer bearing member is sandwiched by an opposing portion of an image bearing member and the developer bearing member, C denotes capacitance between the image bearing member and the developer bearing member, ?V denotes a development contrast, Q/S denotes a charge amount per unit area of the developer borne by the developer bearing member, and Av denotes a peripheral velocity ratio, which is a ratio of a peripheral velocity of the developer bearing member to a peripheral velocity of the image bearing member. A first peripheral velocity ratio is set so that |Q/S×?v|?|C×?V| is satisfied, and a second peripheral velocity ratio which is larger than the first peripheral velocity ratio is set so that |Q/S×?v|>|C×?V| is satisfied.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: March 24, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Norihito Naito, Go Shindo, Masataka Mochizuki
  • Patent number: 10520852
    Abstract: An image forming apparatus includes an image bearing member on which an electrostatic latent image is formable, and a developing device including a developer carrying member, a container, and a supply roller. When the developing device including the developer carrying member, to which a lubricant different from the developer is applied, is used for the first time, a first initial operation of transferring the lubricant from the developer carrying member to the image bearing member together with the developer is performed. The image forming apparatus further includes a storage unit configured to store a suspension state when suspension is detected before the initial operation completes, and a controller configured to execute a second initial operation as an operation of resuming the suspended first initial operation on the basis of the stored suspension state.
    Type: Grant
    Filed: September 13, 2018
    Date of Patent: December 31, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Masataka Mochizuki, Hisashi Yamauchi, Norihito Naito
  • Patent number: 10466634
    Abstract: An image forming apparatus includes: an image bearing member; a developer carrying member configured to contact with the image bearing member and to be separated from the image bearing member; a control unit for controlling the image bearing member and the developer carrying member; and a contact member disposed in contact with the image bearing member. The control unit is configured to sequentially execute: (1) rotating the image bearing member at a first speed in a separated state; (2) switching the image bearing member and the developer carrying member from the separated state to a contact state in a state in which the image bearing member rotates at the first speed; and (3) rotating the image bearing member by decreasing a rotation speed of the image bearing member from the first speed to a second speed smaller than the first speed in the contact state.
    Type: Grant
    Filed: September 25, 2018
    Date of Patent: November 5, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Hisashi Yamauchi, Masataka Mochizuki, Norihito Naito
  • Patent number: 7182846
    Abstract: A gas sensor element is provided which is designed to measure the concentration of hydrogen-containing gas accurately. The sensor element includes an oxygen pump cell working to keep the concentration of oxygen contained in measurement gasses entering a measurement gas chamber at a low concentration level and a hydrogen-containing gas measurement cell. The hydrogen-containing gas measurement cell is made up of a proton-conductive solid electrolyte body and a first and a second gas measurement electrode affixed to the proton-conductive solid electrolyte body. The first gas measurement electrode is exposed to the measurement gas chamber and serves to produce a signal between the first and second gas measurement electrodes as a function of the concentration of the hydrogen-containing gas.
    Type: Grant
    Filed: May 29, 2003
    Date of Patent: February 27, 2007
    Assignees: Denso Corporation, Nippon Soken, Inc.
    Inventors: Keigo Mizutani, Masataka Naito, Daisuke Makino, Kazunori Suzuki
  • Patent number: 7172261
    Abstract: A printer includes an ink jet head, a recovery unit, a moving unit, a conveying unit and a cover. The ink jet head performs printing on a printing medium and has an ink ejection port on an ejection port forming surface. The recovery unit is used for a recovery process for maintaining an ink ejection state of the ink jet head in a good condition. The recovery unit includes a cap for covering the ejection port forming surface, a wiping member for wiping the ejection port forming surface, and an absorbing member for receiving ink ejected from the ejection port of the ink jet head. The moving unit moves the recovery unit to a position where the recovery unit faces the ink jet head and to a position where the recovery unit does not face the ink jet head, the ejection forming surface of which is oriented toward the printing medium. The conveying unit conveys the printing medium to be printed by the ink jet head. The cover contains the ink jet head and the recovery unit.
    Type: Grant
    Filed: October 26, 2004
    Date of Patent: February 6, 2007
    Assignee: Canon Finetech Inc.
    Inventors: Hitoshi Fujimoto, Katsumi Sugiyama, Masataka Naito, Masatoshi Ikkatai, Tsutomu Harada, Tatsuya Fukushima, Takefumi Tamura, Tsuyoshi Mikoshiba
  • Publication number: 20050088481
    Abstract: A printer includes an ink jet head, a recovery unit, a moving unit, a conveying unit and a cover. The ink jet head performs printing on a printing medium and has an ink ejection port on an ejection port forming surface. The recovery unit is used for a recovery process for maintaining an ink ejection state of the ink jet head in a good condition. The recovery unit includes a cap for covering the ejection port forming surface, a wiping member for wiping the ejection port forming surface, and an absorbing member for receiving ink ejected from the ejection port of the ink jet head. The moving unit moves the recovery unit to a position where the recovery unit faces the ink jet head and to a position where the recovery unit does not face the ink jet head, the ejection forming surface of which is oriented toward the printing medium. The conveying unit conveys the printing medium to be printed by the ink jet head. The cover contains the ink jet head and the recovery unit.
    Type: Application
    Filed: October 26, 2004
    Publication date: April 28, 2005
    Applicant: Canon Finetech Inc.
    Inventors: Hitoshi Fujimoto, Katsumi Sugiyama, Masataka Naito, Masatoshi Ikkatai, Tsutomu Harada, Tatsuya Fukushima, Takefumi Tamura, Tsuyoshi Mikoshiba
  • Patent number: 6871936
    Abstract: In a recovering apparatus for recovering ink ejecting ports forming a plane of an ink jet head, an ink absorbing member is disposed inward of a cap and proximate to the ink ejecting ports, facing the ink ejecting ports at a predetermined distance therefrom. Large ink droplets or water droplets adhering to the ink ejecting ports are then absorbed in the absorbing member. Thereafter, the plane of the ink jet heads with the ink ejecting ports is cleanly wiped by a wiping member, thereby preventing scattering of ink droplets or water droplets away from the ink ejecting ports. A trough is located adjacent to each head, and the recovering apparatus is disposed with respect to the trough so that a distance between the recovering apparatus and the ink jet head can be reduced, thereby permitting a compact arrangement of the recovering apparatus and the ink jet head.
    Type: Grant
    Filed: April 14, 2003
    Date of Patent: March 29, 2005
    Assignee: Canon Finetech Inc.
    Inventors: Hitoshi Fujimoto, Katsumi Sugiyama, Masataka Naito, Masatoshi Ikkatai, Tsutomu Harada, Tatsuya Fukushima, Takefumi Tamura, Tsuyoshi Mikoshiba
  • Publication number: 20030221975
    Abstract: A gas sensor element is provided which is designed to measure the concentration of hydrogen-containing gas accurately. The sensor element includes an oxygen pump cell working to keep the concentration of oxygen contained in measurement gasses entering a measurement gas chamber at a low concentration level and a hydrogen-containing gas measurement cell. The hydrogen-containing gas measurement cell is made up of a proton-conductive solid electrolyte body and a first and a second gas measurement electrode affixed to the proton-conductive solid electrolyte body. The first gas measurement electrode is exposed to the measurement gas chamber and serves to produce a signal between the first and second gas measurement electrodes as a function of the concentration of the hydrogen-containing gas.
    Type: Application
    Filed: May 29, 2003
    Publication date: December 4, 2003
    Applicants: DENSO CORPORATION, NIPPON SOKEN, INC.
    Inventors: Keigo Mizutani, Masataka Naito, Daisuke Makino, Kazunori Suzuki
  • Publication number: 20030202036
    Abstract: To provide a small-sized recovering apparatus for recovering the ink ejecting ports forming plane of an ink jet head, an ink absorbing member disposed inward of a cap comes near to the ink ejecting ports forming plane of the ink jet head with a predetermined distance to face to it. Subsequently, large ink droplets or water droplets adhering to the ink ejecting ports forming plane of the ink jet head are absorbed in the absorbing member. Thereafter, the ink ejecting ports forming plane is cleanly wiped by a wiping member, whereby there does not arise a malfunction that ink droplets or water droplets are scattered away from the ink ejecting ports forming plane of the ink jet head. Since a trough serving as recovering means is located adjacent to each head, a distance of relative displacement between the recovering means and the ink jet head can be reduced, resulting in the whole recovering apparatus being designed and constructed with small dimensions.
    Type: Application
    Filed: April 14, 2003
    Publication date: October 30, 2003
    Applicant: CANON APTEX INC.
    Inventors: Hitoshi Fujimoto, Katsumi Sugiyama, Masataka Naito, Masatoshi Ikkatai, Tsutomu Harada, Tatsuya Fukushima, Takefumi Tamura, Tsuyoshi Mikoshiba
  • Publication number: 20010033308
    Abstract: To provide a small-sized recovering apparatus for recovering the ink ejecting ports forming plane of an ink jet head, an ink absorbing member disposed inward of a cap comes near to the ink ejecting ports forming plane of the ink jet head with a predetermined distance to face to it. Subsequently, large ink droplets or water droplets adhering to the ink ejecting ports forming plane of the ink jet head are absorbed in the absorbing member. Thereafter, the ink ejecting ports forming plane is cleanly wiped by a wiping member, whereby there does not arise a malfunction that ink droplets or water droplets are scattered away from the ink ejecting ports forming plane of the ink jet head. Since a trough serving as recovering means is located adjacent to each head, a distance of relative displacement between the recovering means and the ink jet head can be reduced, resulting in the whole recovering apparatus being designed and constructed with small dimensions.
    Type: Application
    Filed: March 10, 1995
    Publication date: October 25, 2001
    Inventors: HITOSHI FUJIMOTO, KATSUMI SUGIYAMA, MASATAKA NAITO, MASATOSHI IKKATAI, TSUTOMU HARADA, TATSUYA FUKUSHIMA, TAKEFUMI TAMURA, TSUYOSHI MIKOSHIBA
  • Patent number: 6126343
    Abstract: A printing medium feeding apparatus comprises a conveying belt, on which a roll-shaped printing medium is placed with the lower surface of the roll being in contact therewith to unwind the outer periphery of the roll. With the arrangement, setup of the roll to the feeding apparatus is completed easily by only placing the roll onto the conveying belt, as compared with a construction in which the center of a roll is rotatably supported. It is also possible to omit or simplify a transmission mechanism such as a train of reduction gears that is necessary for the case of central driving. Further, it is also possible to feed a constant amount of length at a constant drive speed irrespective of radius of the roll.
    Type: Grant
    Filed: July 1, 1997
    Date of Patent: October 3, 2000
    Assignee: Canon Aptex, Inc.
    Inventors: Katsumi Sugiyama, Yoshihiko Kitahara, Masataka Naito, Masatoshi Ikkatai, Tsutomu Harada, Tatsuya Fukushima, Hitoshi Fujimoto, Tsuyoshi Mikoshiba, Takefumi Tamura
  • Patent number: 5953035
    Abstract: A printing apparatus is capable of freely selecting a plurality of sheet feeding units each having a different controlling method. It is discriminated as to which one among plural kinds of sheet feeding units is fitted, and printing and a motor for a sheet feeding-unit are controlled based on the result of the discrimination from an output from a sensor disposed on the sheet feeding unit. Especially, in the case that a roll shaped paper feeding unit is fitted, it is judged that a printing medium reaches the position where printing can be started when a TOF sensor detects black color, and in the case that a cut sheet feeding unit is fitted, it is judged that the recording medium reaches the position where printing can be started when the TOF sensor detects white color.
    Type: Grant
    Filed: May 22, 1995
    Date of Patent: September 14, 1999
    Assignee: Canon Aptex Inc.
    Inventors: Yuichi Watanabe, Yoshihiko Kitahara, Hideaki Kishida, Masataka Naito, Masatoshi Ikkatai, Hitoshi Fujimoto
  • Patent number: 5871208
    Abstract: The present invention provides a sheet convey apparatus with a sheet stacking plate, supply roller for conveying a sheet from the sheet stacking plate, a separating device for separating or supplying the conveyed sheet to a treatment portion, a conveyer for conveying the sheet on the treatment portion, a discharger for discharging the sheet from the treatment portion onto the sheet stacking plate again, and an apparatus body cover. The sheet stacking plate cooperates with the cover to form a substantially horizontal sheet stacking surface and is arranged immediately above the conveyor.
    Type: Grant
    Filed: September 25, 1997
    Date of Patent: February 16, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Katsuaki Hirai, Masataka Naito
  • Patent number: 5819151
    Abstract: The present invention provides an original feeding apparatus comprising first original feeding means for directing an original to an original reading station from one side thereof in an original-stationary scanning mode in which the original is read while fixing the original at the original reading station, and second original feeding means for directing then original to the original reading station from the other side thereof in an original-through scanning mode in which the original is read while shifting the original along the original reading station.
    Type: Grant
    Filed: November 15, 1996
    Date of Patent: October 6, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masataka Naito, Yuji Takahashi, Masakazu Hiroi, Yoshinori Isobe, Akimaro Yoshida, Hitoshi Fujimoto, Tomohito Nakagawa
  • Patent number: 5676811
    Abstract: An air-fuel ratio detecting element is composed of an oxygen pump portion and an oxygen sensor portion which are provided on a single solid electrolyte sheet, a heating element, and a spacer. The oxygen pump portion is composed of a pair first of electrodes provided on opposite sides of the solid electrolyte sheet, and a communication hole which is formed through the solid electrolyte sheet and the electrodes. Electrodes are disposed on the solid electrolyte sheet on the same side as the second electrode, whereby the oxygen sensor portion is formed. The spacer has an opening and a slit-like opening. The heating element 4, the spacer, and the solid electrolyte sheet are stacked from bottom to top, and then the stacked assembly is baked. In this case, they are stacked such that the opening faces the first electrodes and the second electrode.
    Type: Grant
    Filed: January 27, 1997
    Date of Patent: October 14, 1997
    Assignees: Nippondenso Co., Ltd., Nippon Soken, Inc.
    Inventors: Daisuke Makino, Hisayoshi Ohta, Keigo Mizutani, Masataka Naito, Masanori Yamada, Masahiro Shibata, Hiromi Sano
  • Patent number: 5579083
    Abstract: The present invention provides an image forming system having an original-stationary scanning mode and an original-through scanning mode characterized by control means for more shortening a sheet supply distance in the original-through scanning more than that in the original-stationary scanning mode.
    Type: Grant
    Filed: March 10, 1995
    Date of Patent: November 26, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masataka Naito, Yuji Takahashi, Masakazu Hiroi, Yoshinori Isobe, Akimaro Yoshida, Hitoshi Fujimoto, Tomohito Nakagawa
  • Patent number: 5546168
    Abstract: A copying apparatus has a recirculating document feeder; an exposure device for scanning and exposing the fed document sheets fed onto the document table by the document recirculating device; an image forming device for forming the images on the scanned and exposed document sheets; and a sheet receiving device for receiving and storing the recording medium sheets carrying images formed by the image forming device.
    Type: Grant
    Filed: December 23, 1993
    Date of Patent: August 13, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Seiichiro Adachi, Masataka Naito, Masakazu Hiroi
  • Patent number: RE35087
    Abstract: A sheet sorting apparatus with a stapler, includes a plurality of bin trays, bin tray shifting device for moving the plurality of the bin trays stepwisely substantially in the vertical direction to oppose the respective bin trays to a sheet inlet of the sorting apparatus, while expanding the clearance between the bin tray opposed to the sheet inlet and an upper adjacent bin tray to provide a larger clearance than the predetermined clearances, a shaft extending substantially perpendicularly to the extension of the inclined sheet receiving surface, and a stapler, supported rotatably about the shaft and having a stapling head movable to above the sheet receiving surface in a lateral direction by rotation about the shaft and an anvil movable to below the sheet receiving surface by the rotation, for stapling the sheets interposed between the stapling head and the anvil, wherein the bin trays are so disposed that between those ends of adjacent ones of the bin trays which are closer to the sheet inlet are deviated w
    Type: Grant
    Filed: May 29, 1992
    Date of Patent: November 14, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventors: Nobutaka Uto, Hironori Shido, Jun Saito, Masakazu Hiroi, Kenji Kobayashi, Koichi Murakami, Masataka Naito
  • Patent number: D370495
    Type: Grant
    Filed: November 22, 1994
    Date of Patent: June 4, 1996
    Assignees: Canon Kabushiki Kaisha, Canon Aptex Inc.
    Inventors: Manabu Inoue, Masataka Naito
  • Patent number: D370496
    Type: Grant
    Filed: November 22, 1994
    Date of Patent: June 4, 1996
    Assignees: Canon Kabushiki Kaisha, Canon Aptex Inc.
    Inventors: Manabu Inoue, Masataka Naito