Patents by Inventor Yoshinobu Sakaue

Yoshinobu Sakaue 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: 20210318536
    Abstract: An optical scanning device includes light sources, a deflector, an optical element, and light blockers. The light blockers are spaced apart in a rotation direction of the deflector. An inequality ?1<?2 is satisfied, where when viewed from the rotation axis direction, ?1 is an angle formed by a line segment connecting the end portion of a light blocker disposed most downstream in the rotation direction to a rotation axis center of the deflector and a line segment connecting the end portion of a light blocker disposed most upstream in the rotation direction to the rotation axis center, and ?2 is an angle formed by a line segment connecting an upstream end portion of one mirror surface in the rotation direction to the rotation axis center and a line segment connecting a downstream end portion of the one mirror surface in the rotation direction to the rotation axis center.
    Type: Application
    Filed: April 2, 2021
    Publication date: October 14, 2021
    Applicant: Ricoh Company, Ltd.
    Inventors: Yoshinobu SAKAUE, Takeshi YAMAKAWA, Susumu NARITA, Ryo SATO
  • Patent number: 10520850
    Abstract: An image forming apparatus includes circuitry, a reader, and an exposure device that drives lighting elements aligned in a main scanning direction to form a first test image. The circuitry acquires density of first sub-areas, into which the first test image is divided in the main scanning direction, and calculates first correction data based on density of each of the first sub-areas and average density of the first sub-areas, to correct light amounts of the lighting elements. The exposure device forms a second test image with the light amounts corrected. The circuitry acquires density of second sub-areas, into which the second test image is divided in the main scanning direction, and calculates second correction data based on density of a second sub-area adjacent to each of the second sub-areas, to further correct the light amounts. The second sub-areas are differently located from the first sub-areas in the main scanning direction.
    Type: Grant
    Filed: February 5, 2019
    Date of Patent: December 31, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroaki Nishina, Koichi Murota, Yoshinobu Sakaue, Masashi Suzuki, Susumu Narita, Takuma Nishio, Ryo Sato
  • Patent number: 10514646
    Abstract: An image forming apparatus includes a latent image bearer, a latent image writing device, a developing device, a conveyance unit to convey a recording medium, a transfer device, a length data acquisition unit to obtain a length of the recording medium in a conveyance direction of the recording medium, an image forming processor to form a test pattern, and a light quantity correction calculator that acquires image density data of the test pattern and calculates a light quantity correction value to correct a light quantity. The image forming processor sets a position of the test pattern on the recording medium in the conveyance direction of the recording medium and a length of the test pattern in the conveyance direction of the recording medium based on the length of the recording medium in the conveyance direction of the recording medium obtained by the length data acquisition unit.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: December 24, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Susumu Narita, Yoshinobu Sakaue, Ryo Sato, Koichi Murota, Masashi Suzuki, Takuma Nishio, Hiroaki Nishina
  • Patent number: 10437188
    Abstract: An image forming apparatus includes an image reading device; an image forming device including a photoconductor, a charger, an exposure device including a light-emitting element, a memory to store a first correction value for correction a light emission amount of the light-emitting element, and a driver to drive the light-emitting element, a developing device, a transfer device, and a fixing device. The image forming apparatus further includes a processor to calculate a second correction value for correcting the light emission amount, based on density data of image data of a predetermined pattern on a recording medium; calculate a third correction value for correcting the light emission amount, based on the first correction value and the second correction value; and determine, before calculating the third correction value, whether placement of the recording medium on the reading table is correct based on the density data.
    Type: Grant
    Filed: July 30, 2018
    Date of Patent: October 8, 2019
    Assignee: RICOH COMPANY, LTD.
    Inventors: Takuma Nishio, Yoshinobu Sakaue, Susumu Narita, Ryo Sato, Koichi Murota, Masashi Suzuki, Hiroaki Nishina
  • Publication number: 20190286005
    Abstract: An image forming apparatus includes circuitry, a reader, and an exposure device that drives lighting elements aligned in a main scanning direction to form a first test image. The circuitry acquires density of first sub-areas, into which the first test image is divided in the main scanning direction, and calculates first correction data based on density of each of the first sub-areas and average density of the first sub-areas, to correct light amounts of the lighting elements. The exposure device forms a second test image with the light amounts corrected. The circuitry acquires density of second sub-areas, into which the second test image is divided in the main scanning direction, and calculates second correction data based on density of a second sub-area adjacent to each of the second sub-areas, to further correct the light amounts. The second sub-areas are differently located from the first sub-areas in the main scanning direction.
    Type: Application
    Filed: February 5, 2019
    Publication date: September 19, 2019
    Inventors: Hiroaki NISHINA, Koichi MUROTA, Yoshinobu SAKAUE, Masashi SUZUKI, Susumu NARITA, Takuma NISHIO, Ryo SATO
  • Patent number: 10409192
    Abstract: An optical scanner includes a light source including a plurality of light emitting elements, a polygon mirror which deflects light from the light source for scanning a surface of a subject, an optical element arranged between the light source and the polygon mirror, having optical power in a sub scanning direction, a synchronous detector which detects the light deflected by the polygon mirror for synchronous detection and generates a signal for controlling a timing at which the scanning of the surface is started, and a fixing element which secures one end of the optical element. The light emitting elements of the light source are aligned with a certain tilt angle relative to the sub scanning direction. Light from one of the light emitting elements disposed closest to the fixing element in a main scanning direction is used for synchronous detection.
    Type: Grant
    Filed: November 7, 2017
    Date of Patent: September 10, 2019
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tomoya Fujii, Tadashi Nakamura, Nobuyuki Arai, Yoshinobu Sakaue, Noboru Kusunose, Daisuke Imaki
  • Publication number: 20190094776
    Abstract: An image forming apparatus includes an image reading device; an image forming device including a photoconductor, a charger, an exposure device including a light-emitting element, a memory to store a first correction value for correction a light emission amount of the light-emitting element, and a driver to drive the light-emitting element, a developing device, a transfer device, and a fixing device. The image forming apparatus further includes a processor to calculate a second correction value for correcting the light emission amount, based on density data of image data of a predetermined pattern on a recording medium; calculate a third correction value for correcting the light emission amount, based on the first correction value and the second correction value; and determine, before calculating the third correction value, whether placement of the recording medium on the reading table is correct based on the density data.
    Type: Application
    Filed: July 30, 2018
    Publication date: March 28, 2019
    Applicant: Ricoh Company, Ltd.
    Inventors: TAKUMA NISHIO, Yoshinobu Sakaue, Susumu Narita, Ryo Sato, Koichi Murota, Masashi Suzuki, Hiroaki Nishina
  • Publication number: 20180356759
    Abstract: An image forming apparatus includes a latent image bearer, a latent image writing device, a developing device, a conveyance unit to convey a recording medium, a transfer device, a length data acquisition unit to obtain a length of the recording medium in a conveyance direction of the recording medium, an image forming processor to form a test pattern, and a light quantity correction calculator that acquires image density data of the test pattern and calculates a light quantity correction value to correct a light quantity. The image forming processor sets a position of the test pattern on the recording medium in the conveyance direction of the recording medium and a length of the test pattern in the conveyance direction of the recording medium based on the length of the recording medium in the conveyance direction of the recording medium obtained by the length data acquisition unit.
    Type: Application
    Filed: May 25, 2018
    Publication date: December 13, 2018
    Applicant: Ricoh Company, Ltd.
    Inventors: Susumu Narita, Yoshinobu Sakaue, Ryo Sato, Koichi Murota, Masashi Suzuki, Takuma Nishio, Hiroaki Nishina
  • Patent number: 10082761
    Abstract: An image forming apparatus includes an image bearer, an exposure device, a drive device, a cleaning body, and an exposure device holder. The exposure device is disposed on a motion trajectory between an exposure position and a retracted position and emits light to the image bearer via a lens having a lens surface at the exposure position. The drive device causes the exposure device to move between the exposure position and the retracted position. The cleaning body disposed on the motion trajectory of the exposure device tilts a cleaning surface when contacting with the lens surface of the exposure device. The exposure device holder supports the exposure device while changing an attitude of the exposure device such that the lens surface remains in contact with the cleaning surface of the cleaning body when the exposure device moves from the retracted position to the exposure position.
    Type: Grant
    Filed: June 22, 2017
    Date of Patent: September 25, 2018
    Assignee: RICOH COMPANY, LTD.
    Inventors: Susumu Narita, Takeshi Yamakawa, Yoshinobu Sakaue, Kazunori Watanabe, Tomoya Fujii, Ryo Sato
  • Publication number: 20180088485
    Abstract: An optical scanner includes a light source including a plurality of light emitting elements, a polygon mirror which deflects light from the light source for scanning a surface of a subject, an optical element arranged between the light source and the polygon mirror, having optical power in a sub scanning direction, a synchronous detector which detects the light deflected by the polygon mirror for synchronous detection and generates a signal for controlling a timing at which the scanning of the surface is started, and a fixing element which secures one end of the optical element. The light emitting elements of the light source are aligned with a certain tilt angle relative to the sub scanning direction. Light from one of the light emitting elements disposed closest to the fixing element in a main scanning direction is used for synchronous detection.
    Type: Application
    Filed: November 7, 2017
    Publication date: March 29, 2018
    Inventors: TOMOYA FUJII, Tadashi NAKAMURA, Nobuyuki ARAI, Yoshinobu SAKAUE, Noboru KUSUNOSE, Daisuke IMAKI
  • Patent number: 9864296
    Abstract: An optical scanner includes a light source including a plurality of light emitting elements, a polygon mirror which deflects light from the light source for scanning a surface of a subject, an optical element arranged between the light source and the polygon mirror, having optical power in a sub scanning direction, a synchronous detector which detects the light deflected by the polygon mirror for synchronous detection and generates a signal for controlling a timing at which the scanning of the surface is started, and a fixing element which secures one end of the optical element. The light emitting elements of the light source are aligned with a certain tilt angle relative to the sub scanning direction. Light from one of the light emitting elements disposed closest to the fixing element in a main scanning direction is used for synchronous detection.
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: January 9, 2018
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tomoya Fujii, Tadashi Nakamura, Nobuyuki Arai, Yoshinobu Sakaue, Noboru Kusunose, Daisuke Imaki
  • Publication number: 20170371292
    Abstract: An image forming apparatus includes an image bearer, an exposure device, a (hive device, a cleaning body, and an exposure device holder. The exposure device is disposed on a motion trajectory between an exposure position and a retracted position and emits light to the image bearer via a lens having a lens surface at the exposure position. The drive device causes the exposure device to move between the exposure position and the retracted position. The cleaning body disposed on the motion trajectory of the exposure device tilts a cleaning surface when contacting with the lens surface of the exposure device. The exposure device holder supports the exposure device while changing an attitude of the exposure device such that the lens surface remains in contact with the cleaning surface of the cleaning body when the exposure device moves from the retracted position to the exposure position.
    Type: Application
    Filed: June 22, 2017
    Publication date: December 28, 2017
    Applicant: Ricoh Company, Ltd.
    Inventors: Susumu NARITA, Takeshi YAMAKAWA, Yoshinobu SAKAUE, Kazunori WATANABE, Tomoya FUJII, Ryo SATO
  • Patent number: 9494793
    Abstract: In a light beam scanning device, a plurality of light sources, which irradiates a plurality of light beams in a first direction and is retained by a holder, are disposed at distance from one another in a second direction orthogonal to the first direction. The plurality of light beams are incident, via a coupling optical system, to deflecting and reflecting surfaces of a deflector from a direction that is tilted with respect to a plane orthogonal to the rotational shaft of the deflector. The holder is supported by a housing of the light beam scanning device at a plurality of different positions in a third direction extending from the light source to the coupling optical system.
    Type: Grant
    Filed: December 17, 2012
    Date of Patent: November 15, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Nobuyuki Arai, Makoto Hirakawa, Yoshinobu Sakaue, Noboru Kusunose, Tomoya Fujii
  • Patent number: 9471028
    Abstract: An optical scanning device includes a light source configured to emit a light beam; a rotary deflector configured to perform optical scanning by reflecting and deflecting the light beam emitted from the light source while rotating; an optical system forming member configured to form a path of the light beam; and a resonator having a resonance frequency corresponding to a sound generated by rotational drive of the rotary deflector. The rotary deflector is installed in a closed space. The resonator is installed so that the sound within the closed space is absorbed.
    Type: Grant
    Filed: February 18, 2016
    Date of Patent: October 18, 2016
    Assignee: RICOH COMPANY, LIMITED
    Inventors: Kazunori Watanabe, Yoshinobu Sakaue, Susumu Narita, Hiroshi Johno
  • Publication number: 20160161906
    Abstract: An optical scanning device includes a light source configured to emit a light beam; a rotary deflector configured to perform optical scanning by reflecting and deflecting the light beam emitted from the light source while rotating; an optical system forming member configured to form a path of the light beam; and a resonator having a resonance frequency corresponding to a sound generated by rotational drive of the rotary deflector. The rotary deflector is installed in a closed space. The resonator is installed so that the sound within the closed space is absorbed.
    Type: Application
    Filed: February 18, 2016
    Publication date: June 9, 2016
    Applicant: Ricoh Company, Limited
    Inventors: Kazunori WATANABE, Yoshinobu SAKAUE, Susumu NARITA, Hiroshi JOHNO
  • Patent number: 9360790
    Abstract: An optical scanning device that performs optical scanning across an object to be scanned with a light deflected, comprises: a deflection unit that causes a deflection mirror driven by a driving source to deflect the travel direction of light emitted from a light source and generates the light deflected; a resonator that includes a resonance space for reducing sound emitted from the deflection unit and a resonance passage communicating with the resonance space to direct sound from outside to inside the resonance space; a housing that accommodates the deflection unit and the resonator, and a partition wall that partitions a deflection unit accommodating space acting as a space for accommodating the deflection unit in the housing and a resonator accommodating space acting as a space for accommodating the resonator in the housing.
    Type: Grant
    Filed: May 11, 2015
    Date of Patent: June 7, 2016
    Assignee: RICOH COMPANY, LIMITED
    Inventors: Hiroshi Johno, Yoshinobu Sakaue, Kazunori Watanabe, Susumu Narita
  • Patent number: 9298121
    Abstract: An optical scanning device includes a light source configured to emit a light beam; a rotary deflector configured to perform optical scanning by reflecting and deflecting the light beam emitted from the light source while rotating; an optical system forming member configured to form a path of the light beam; and a resonator having a resonance frequency corresponding to a sound generated by rotational drive of the rotary deflector. The rotary deflector is installed in a closed space. The resonator is installed so that the sound within the closed space is absorbed.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: March 29, 2016
    Assignee: RICOH COMPANY, LIMITED
    Inventors: Kazunori Watanabe, Yoshinobu Sakaue, Susumu Narita, Hiroshi Johno
  • Patent number: 9207629
    Abstract: An image forming apparatus includes an apparatus body including positioning faces; a detachably attachable unit including receiving parts and contact parts; and a biasing member to press the receiving parts of the detachably attachable unit to the positioning faces disposed on the apparatus body. The biasing member is rotatably disposed to the apparatus body, contacts the contact parts disposed on the detachably attachable unit, presses the receiving parts against the positioning faces, and is elastically deformable in a direction separating from a rotary supporting point of the biasing member; and when the biasing member is rotated to a locked state from a release state, the biasing member is hooked to the contact parts, so that the receiving parts are pressed toward the positioning faces by the biasing member.
    Type: Grant
    Filed: November 19, 2014
    Date of Patent: December 8, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshinobu Sakaue, Hiroshi Johno
  • Publication number: 20150338761
    Abstract: An optical scanning device includes a light source configured to emit a light beam; a rotary deflector configured to perform optical scanning by reflecting and deflecting the light beam emitted from the light source while rotating; an optical system forming member configured to form a path of the light beam; and a resonator having a resonance frequency corresponding to a sound generated by rotational drive of the rotary deflector. The rotary deflector is installed in a closed space. The resonator is installed so that the sound within the closed space is absorbed.
    Type: Application
    Filed: May 22, 2015
    Publication date: November 26, 2015
    Applicant: RICOH COMPANY, LIMITED
    Inventors: Kazunori WATANABE, Yoshinobu SAKAUE, Susumu NARITA, Hiroshi JOHNO
  • Publication number: 20150331350
    Abstract: An optical scanning device that performs optical scanning across an object to be scanned with a light deflected, comprises: a deflection unit that causes a deflection mirror driven by a driving source to deflect the travel direction of light emitted from a light source and generates the light deflected; a resonator that includes a resonance space for reducing sound emitted from the deflection unit and a resonance passage communicating with the resonance space to direct sound from outside to inside the resonance space; a housing that accommodates the deflection unit and the resonator, and a partition wall that partitions a deflection unit accommodating space acting as a space for accommodating the deflection unit in the housing and a resonator accommodating space acting as a space for accommodating the resonator in the housing.
    Type: Application
    Filed: May 11, 2015
    Publication date: November 19, 2015
    Applicant: RICOH COMPANY, LIMITED
    Inventors: Hiroshi JOHNO, Yoshinobu SAKAUE, Kazunori WATANABE, Susumu NARITA