Patents by Inventor Kimiharu Yamazaki

Kimiharu Yamazaki 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).

  • Publication number: 20210165355
    Abstract: An image reading device includes a plurality of image reading units arranged at different positions in a width direction perpendicular to a conveyance direction of a recording medium to read an image on the recording medium at image reading positions and a conveyance roller pair that conveys the recording medium to the plurality of image reading units. The conveyance roller pair includes a drive roller and a driven roller that contacts the drive roller and rotates following the drive roller. The plurality of image reading units includes an upstream and a downstream image reading units downstream from the upstream image reading unit in the conveyance direction. A reading interval between the image reading positions and a diameter of the drive roller satisfy the relation: X2=n1×?×D1a, where X2 represents the reading interval, n1 represents an integer, and D1a represents the diameter of the drive roller.
    Type: Application
    Filed: November 23, 2020
    Publication date: June 3, 2021
    Applicant: Ricoh Company, Ltd.
    Inventors: Kimiharu Yamazaki, Hideyo Makino, Susumu Mikajiri, Satoshi Nakayama, Hiroki Yamamura, Kohta Aoyagi, Tohru Matsumoto
  • Publication number: 20210166096
    Abstract: A conveyance device includes a conveyance roller pair to convey a recording medium to an image reading position of an image reading unit. The conveyance roller pair includes a drive roller and a driven roller. The driven roller contacts the drive roller and rotates following the drive roller. The drive roller has a diameter satisfying a relation in which a detection mark on the recording medium is on a position away from a leading end of the recording medium by an integral multiple of a circumference of the drive roller in a conveyance direction of the recording medium.
    Type: Application
    Filed: November 24, 2020
    Publication date: June 3, 2021
    Applicant: Ricoh Company, Ltd.
    Inventors: Kimiharu Yamazaki, Hideyo Makino, Susumu Mikajiri, Satoshi Nakayama, Kohta Aoyagi, Hiroki Yamamura
  • Publication number: 20210168253
    Abstract: An image reading device includes a background member, an illumination unit opposed to the background member, and a reader. The illumination unit emits light to a recording medium having an image thereon. The reader receives a reflection from the recording medium to read the image. The background member has a facing surface that faces the recording medium. The facing surface includes a reference portion on a center portion in a width direction of the background member. The reference portion has a higher reflectance than an end portion of the facing surface in the width direction.
    Type: Application
    Filed: October 29, 2020
    Publication date: June 3, 2021
    Applicant: Ricoh Company, Ltd.
    Inventors: Satoshi Nakayama, Susumu Mikajiri, Hideyo Makino, Yoshinari Onuma, Kimiharu Yamazaki, Kohta Aoyagi
  • Publication number: 20210088948
    Abstract: An image forming apparatus includes a plurality of temperature-influence members, a first-point temperature acquisition unit, a second-point temperature estimation unit, and a controller. The plurality of temperature-influence members have influence on a temperature of a recording medium on which an image is formed. The first-point temperature acquisition unit is configured to detect or estimate a temperature of the recording medium at a first point. The second-point temperature estimation unit is configured to estimate a temperature of the recording medium at a second point, based on a detection result of at least one of a temperature of the recording medium at a point different from the second point and a temperature of a member or atmosphere. The controller is configured to control the plurality of temperature-influence members, based on an acquisition result from the first-point temperature acquisition unit and an estimation result from the second-point temperature estimation unit.
    Type: Application
    Filed: September 24, 2020
    Publication date: March 25, 2021
    Applicants: Ricoh Company, Ltd., TOKYO INSTITUTE OF TECHNOLOGY
    Inventors: Kaori HEMMI, Koichi KATO, Kimiharu YAMAZAKI, Kazuyoshi FUSHINOBU, Shunsuke KAWASAKI, Shinichi KURAMOTO
  • Patent number: 10931844
    Abstract: An image inspection apparatus includes a first outputter that outputs color information of an image to be formed on a recording medium determined according to the type of recording medium; a reader provided facing one side of the recording medium and configured to output an image signal obtained by reading the recording medium; a second outputter that outputs an edge position of the recording medium and/or the image formed on the recording medium detected based on the image signal; first background members configured to face and contact another side of the recording medium and having different heights; second background members configured to face and contact the another side of the recording medium and having different colors; and an arranger that brings one member, selected according to the recording medium type from among the first and second background members, into contact with the another side of the recording medium.
    Type: Grant
    Filed: March 10, 2020
    Date of Patent: February 23, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Kohta Aoyagi, Susumu Mikajiri, Kimiharu Yamazaki, Satoshi Nakayama, Hideyo Makino, Yoshinari Onuma
  • Publication number: 20210016584
    Abstract: A conveyance apparatus includes a plurality of conveyors and an image reader. The plurality of conveyors conveys a recording material. The image reader reads a pattern image on the recording material being conveyed. The conveyance apparatus further includes circuitry to control the image reader. The circuitry controls the image reader to read the pattern image on the recording material in a period including a timing at which a trailing edge of the recording material being conveyed by at least two of the plurality of conveyors exits an upstream conveyor among the at least two of the plurality of conveyors in a direction of conveyance of the recording material.
    Type: Application
    Filed: July 14, 2020
    Publication date: January 21, 2021
    Applicant: Ricoh Company, Ltd.
    Inventors: Kohta Aoyagi, Hideyo Makino, Susumu Mikajiri, Kimiharu Yamazaki, Yoshinari Onuma, Satoshi Nakayama
  • Patent number: 10895831
    Abstract: A conveyance control device includes a fixing device including a first rotary body, a cooling device including a second rotary body, and control circuitry. The circuitry records a first drive amount for the second body when the first and second bodies are driven at a speed, a second drive amount for the second body when the second body is driven without the first body being driven, a third drive amount for the second body when the second body is driven to rotate faster than a rotating speed and the first body is driven, and a fourth drive amount for the second body when the second body is driven to rotate slower than the rotating speed and the first body is driven. The circuitry performs correction based on the drive amounts in such a manner that a drive amount of the second body becomes equivalent to the second drive amount.
    Type: Grant
    Filed: March 18, 2020
    Date of Patent: January 19, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Kimiharu Yamazaki, Hideyo Makino, Susumu Mikajiri, Yoshinari Onuma, Satoshi Nakayama, Hiroki Yamamura, Kohta Aoyagi
  • Patent number: 10877415
    Abstract: An image forming apparatus includes a drive device including a first drive transmission passage through which a driving force of a drive source is transmitted to a developer bearer via a first joint and a second drive transmission passage through which the driving force is transmitted to a rotary body via a second joint. The first drive transmission passage and the second drive transmission passage are defined such that one of a first drive transmission ratio to the first joint of the first drive transmission passage and a second drive transmission ratio to the second joint of the second drive transmission passage is an integral multiple of the other of the first drive transmission ratio from the drive source to the first joint of the first drive transmission passage and the second drive transmission ratio from the drive source to the second joint of the second drive transmission passage.
    Type: Grant
    Filed: September 9, 2019
    Date of Patent: December 29, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroaki Takagi, Kimiharu Yamazaki, Naoyuki Suido
  • Patent number: 10855865
    Abstract: A reading device including a reader, a position reference member, and circuitry. The position reference member has a reference pattern along a first direction of the position reference member. The circuitry is configured to detect the reference pattern of the position reference member; determine coordinates of at least two pixels in the second direction, based on the detected reference pattern; calculate a first correction value based on the coordinates determined for the at least two pixels of the reader in the second direction; detect an outer shape and a position of an image pattern on the conveyed object based on data read by the reader; obtain a difference between an image of the conveyed object, of which a shape has been corrected, and an image of the conveyed object, of which a shape has not been correction; and set a second correction value based on the obtained difference.
    Type: Grant
    Filed: October 16, 2018
    Date of Patent: December 1, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Kimiharu Yamazaki, Kohta Aoyagi, Hideyo Makino, Satoshi Nakayama
  • Publication number: 20200301326
    Abstract: A conveyance control device includes a fixing device including a first rotary body, a cooling device including a second rotary body, and control circuitry. The circuitry records a first drive amount for the second body when the first and second bodies are driven at a speed, a second drive amount for the second body when the second body is driven without the first body being driven, a third drive amount for the second body when the second body is driven to rotate faster than a rotating speed and the first body is driven, and a fourth drive amount for the second body when the second body is driven to rotate slower than the rotating speed and the first body is driven. The circuitry performs correction based on the drive amounts in such a manner that a drive amount of the second body becomes equivalent to the second drive amount.
    Type: Application
    Filed: March 18, 2020
    Publication date: September 24, 2020
    Applicant: Ricoh Company, Ltd.
    Inventors: Kimiharu Yamazaki, Hideyo Makino, Susumu Mikajiri, Yoshinari Onuma, Satoshi Nakayama, Hiroki Yamamura, Kohta Aoyagi
  • Publication number: 20200296243
    Abstract: An image inspection apparatus includes a first outputter that outputs color information of an image to be formed on a recording medium determined according to the type of recording medium; a reader provided facing one side of the recording medium and configured to output an image signal obtained by reading the recording medium; a second outputter that outputs an edge position of the recording medium and/or the image formed on the recording medium detected based on the image signal; first background members configured to face and contact another side of the recording medium and having different heights; second background members configured to face and contact the another side of the recording medium and having different colors; and an arranger that brings one member, selected according to the recording medium type from among the first and second background members, into contact with the another side of the recording medium.
    Type: Application
    Filed: March 10, 2020
    Publication date: September 17, 2020
    Applicant: Ricoh Company, Ltd.
    Inventors: Kohta AOYAGI, Susumu MIKAJIRI, Kimiharu YAMAZAKI, Satoshi NAKAYAMA, Hideyo MAKINO, Yoshinari ONUMA
  • Publication number: 20200004187
    Abstract: An image forming apparatus includes a drive device including a first drive transmission passage through which a driving force of a drive source is transmitted to a developer bearer via a first joint and a second drive transmission passage through which the driving force is transmitted to a rotary body via a second joint. The first drive transmission passage and the second drive transmission passage are defined such that one of a first drive transmission ratio to the first joint of the first drive transmission passage and a second drive transmission ratio to the second joint of the second drive transmission passage is an integral multiple of the other of the first drive transmission ratio from the drive source to the first joint of the first drive transmission passage and the second drive transmission ratio from the drive source to the second joint of the second drive transmission passage.
    Type: Application
    Filed: September 9, 2019
    Publication date: January 2, 2020
    Applicant: Ricoh Company, Ltd.
    Inventors: Hiroaki Takagi, Kimiharu Yamazaki, Naoyuki Suido
  • Patent number: 10520870
    Abstract: An image forming apparatus includes a drive device including a first drive transmission passage through which a driving force of a drive source is transmitted to a developer bearer via a first joint and a second drive transmission passage through which the driving force is transmitted to a rotary body via a second joint. The first drive transmission passage and the second drive transmission passage are defined such that one of a first drive transmission ratio to the first joint of the first drive transmission passage and a second drive transmission ratio to the second joint of the second drive transmission passage is an integral multiple of the other of the first drive transmission ratio from the drive source to the first joint of the first drive transmission passage and the second drive transmission ratio from the drive source to the second joint of the second drive transmission passage.
    Type: Grant
    Filed: June 7, 2017
    Date of Patent: December 31, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroaki Takagi, Kimiharu Yamazaki, Naoyuki Suido
  • Publication number: 20190166271
    Abstract: A reading device including a reader, a position reference member, and circuitry. The position reference member has a reference pattern along a first direction of the position reference member. The circuitry is configured to detect the reference pattern of the position reference member; determine coordinates of at least two pixels in the second direction, based on the detected reference pattern; calculate a first correction value based on the coordinates determined for the at least two pixels of the reader in the second direction; detect an outer shape and a position of an image pattern on the conveyed object based on data read by the reader; obtain a difference between an image of the conveyed object, of which a shape has been corrected, and an image of the conveyed object, of which a shape has not been correction; and set a second correction value based on the obtained difference.
    Type: Application
    Filed: October 16, 2018
    Publication date: May 30, 2019
    Applicant: Ricoh Company, Ltd.
    Inventors: Kimiharu Yamazaki, Kohta Aoyagi, Hideyo Makino, Satoshi Nakayama
  • Publication number: 20190163112
    Abstract: A position detector includes a reading device, a position reference member having a mark opposite the reading device, and circuitry. The circuitry controls the reading device to detect the contour of the processing target and the position of the image pattern on the processing target and the position of the mark and corrects a processing position for the processing target to offset distortion of the reading device.
    Type: Application
    Filed: September 19, 2018
    Publication date: May 30, 2019
    Inventors: Daisuke Nikaku, Masamoto Nakazawa, Ryohma Ikemoto, Osamu Inage, Tatsuya Ishii, Satoshi Iwanami, Hideyo Makino, Kimiharu Yamazaki, Kohta Aoyagi, Satoshi Nakayama
  • Patent number: 10054896
    Abstract: A drive transmission device includes a rotation shaft, a drive transmitter attached to the rotation shaft to slide in an axial direction and including an engaging portion extending in the axial direction, and a coil spring to bias the drive transmitter to one side in the axial direction, and a shaft-side drive transmitter disposed on the rotation shaft. The coil spring includes a sparse portion and a dense portion. The shaft-side drive transmitter engages the engaging portion to prevent the drive transmitter from disengaging from the rotation shaft. The coil spring and the engaging portion satisfy C>A?B where A represents a length of the coil spring in a state in which the shaft-side drive transmitter retains the drive transmitter, B represents a compressed height of the coil spring, and C represents a length of the coil spring in the axial direction.
    Type: Grant
    Filed: June 14, 2016
    Date of Patent: August 21, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroaki Takagi, Kimiharu Yamazaki, Naoyuki Suido, Shogo Sakamoto
  • Patent number: 9879733
    Abstract: A power transmission device includes coaxially a first rotary body including a first gear on a drive source side, a second rotary body including a second gear on a driven side, a third rotary body including a third gear movably held to transmit a driving force, and a guide member disposed at one of the first gear, the second gear, and the third gear to contact a first end surface of a gear tooth of another of the first gear, the second gear, and the third gear, serving as a mating gear, to guide the first end surface between teeth of the one of the first gear, the second gear, and the third gear. The guide member extends toward the mating gear and a tip of the guide member is placed at a distance from an end of the one of the gears in the axial direction.
    Type: Grant
    Filed: February 24, 2015
    Date of Patent: January 30, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroaki Takagi, Naoyuki Suido, Keisuke Shimizu, Kimiharu Yamazaki
  • Publication number: 20170357200
    Abstract: An image forming apparatus includes a drive device including a first drive transmission passage through which a driving force of a drive source is transmitted to a developer bearer via a first joint and a second drive transmission passage through which the driving force is transmitted to a rotary body via a second joint. The first drive transmission passage and the second drive transmission passage are defined such that one of a first drive transmission ratio to the first joint of the first drive transmission passage and a second drive transmission ratio to the second joint of the second drive transmission passage is an integral multiple of the other of the first drive transmission ratio from the drive source to the first joint of the first drive transmission passage and the second drive transmission ratio from the drive source to the second joint of the second drive transmission passage.
    Type: Application
    Filed: June 7, 2017
    Publication date: December 14, 2017
    Applicant: Ricoh Company, Ltd.
    Inventors: Hiroaki Takagi, Kimiharu Yamazaki, Naoyuki Suido
  • Patent number: 9658578
    Abstract: A transfer device includes a belt image bearer; a driving roller that rotates the belt image bearer; a transfer member; first and second driving motors that respectively rotate the driving roller and the transfer member; first and second speed detecting units that respectively detect rotational speeds of the belt image bearer and the transfer member; and a control unit that implements control such that the belt image bearer and the transfer member are rotated at rotational speeds corresponding to a relative speed at which a variation amount is less than a predetermined variation amount, the variation amount being the variation of values of driving torques of the first and second driving motors in a state where the belt image bearer and the transfer member are in contact, with respect to these values in a state where the belt image bearer and the transfer member are separated.
    Type: Grant
    Filed: January 20, 2016
    Date of Patent: May 23, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiromichi Matsuda, Kimiharu Yamazaki, Takafumi Seki, Jun Yamane
  • Patent number: 9581953
    Abstract: A rotary drive device includes a drive motor and drive transmission portion, which transmits a rotational drive force of the motor to a driven rotor and includes three or more drive transmission members. A high stiffness member is attached to a low-stiffness drive transmission member, which is one, lower in stiffness, of two of the drive transmission members, to increase stiffness of the low-stiffness drive transmission member. The two form a drive transmission point corresponding to a resonant point of a lowest resonance frequency among frequencies at a plurality of resonance points in frequency response characteristics derived from rotation information. One drive transmission point, which is on either a drive-transmission input side or output side, other than the drive transmission point corresponding to the resonant point of the lowest resonance frequency, of the low-stiffness drive transmission member is configured to transmit the rotational drive force through the high stiffness member.
    Type: Grant
    Filed: February 9, 2016
    Date of Patent: February 28, 2017
    Assignee: RICOH COMPANY, LIMITED
    Inventors: Naoyuki Suido, Keisuke Shimizu, Hiroaki Takagi, Kimiharu Yamazaki, Tadahiro Satoh