Patents by Inventor Yasuhide Matsuno

Yasuhide Matsuno 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: 10606202
    Abstract: An image forming apparatus includes a photoconductor, a charging roller to charge the photoconductor, a power source to apply a charging bias to the charging roller, a current sensor to generate a feedback signal representing an output current flowing from the charging roller to the photoconductor, a memory, and circuitry. The circuitry calculates film thicknesses of a photoconductor film of the photoconductor at a plurality of points of time based on a voltage of the charging bias and the output current, calculates travel distances of the photoconductor charged at the plurality of points of time, associates the film thicknesses with the travel distances, stores the film thicknesses and the travel distances in the memory, calculates a present estimated film thickness based on the film thicknesses and the travel distances, and calculates an estimated film thickness range corresponding to a present travel distance based on the present estimated film thickness.
    Type: Grant
    Filed: November 8, 2018
    Date of Patent: March 31, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yasuhide Matsuno, Takahiro Yoshimi, Shinji Minami
  • Publication number: 20190146394
    Abstract: An image forming apparatus includes a photoconductor, a charging roller to charge the photoconductor, a power source to apply a charging bias to the charging roller, a current sensor to generate a feedback signal representing an output current flowing from the charging roller to the photoconductor, a memory, and circuitry. The circuitry calculates film thicknesses of a photoconductor film of the photoconductor at a plurality of points of time based on a voltage of the charging bias and the output current, calculates travel distances of the photoconductor charged at the plurality of points of time, associates the film thicknesses with the travel distances, stores the film thicknesses and the travel distances in the memory, calculates a present estimated film thickness based on the film thicknesses and the travel distances, and calculates an estimated film thickness range corresponding to a present travel distance based on the present estimated film thickness.
    Type: Application
    Filed: November 8, 2018
    Publication date: May 16, 2019
    Applicant: Ricoh Company, Ltd.
    Inventors: Yasuhide Matsuno, Takahiro Yoshimi, Shinji Minami
  • Patent number: 9348309
    Abstract: An image forming apparatus includes a latent image bearer, a charging roller, a first cleaner, a second cleaner, and a rotation controller. The latent image bearer bears a latent image on a surface thereof. The charging roller charges the latent image bearer. The first cleaner cleans the surface of the latent image bearer. The second cleaner cleans a surface of the charging roller. The rotation controller controls the latent image bearer to execute a set of backward rotation and first forward rotation at least once during a non-image formation time period, and either temporarily stop and start second forward rotation or continuously execute the second forward rotation by a rotation distance corresponding to at least one rotation of the charging roller.
    Type: Grant
    Filed: February 10, 2015
    Date of Patent: May 24, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Masanari Fujita, Yasuhide Matsuno, Shin Murayama, Shin Yamamoto, Shinichi Arasawa
  • Patent number: 9298127
    Abstract: A developing device includes a developer bearer and a regulation member. The developer bearer bears developer on a surface thereof. The developer bearer is rotatable forward and in reverse. The regulation member is disposed in contact or non-contact with the surface of the developer bearer to regulate amount of the developer on the developer bearer. In a non-development period, when the developer bearer rotates in a direction of reverse rotation opposite to a direction of forward rotation in which the developer bearer rotates in a development period, the developer bearer stops a series of rotating operations after the developer bearer rotates in the direction of forward rotation as a last rotating operation. A total rotation amount of forward rotation is set to be greater than a total rotation amount of reverse rotation in the series of rotating operations.
    Type: Grant
    Filed: August 11, 2014
    Date of Patent: March 29, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshio Sakagawa, Shin Murayama, Yasuhide Matsuno
  • Patent number: 9217989
    Abstract: A process unit includes a rotatable image bearer to bear a toner image on a surface thereof; a developer bearer to supply developer to the image bearer and including a first range, a second range different in property from the first range and adjacent to the first range on an outer side in an axial direction via a first boundary, and a second boundary on an outer side of the first boundary in the axial direction; a cleaning member to remove residual developer from the image bearer; and an abutment part disposed to contact the surface of the image bearer to remove a foreign substance from the image bearer. The abutment part is disposed astride at least one of a first position on the image bearer corresponding to the first boundary, and a second position on the image bearer corresponding to the second boundary.
    Type: Grant
    Filed: October 6, 2014
    Date of Patent: December 22, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Mitsutoshi Kichise, Kenji Nakamura, Takeshi Yamashita, Tamotsu Ikeda, Minoru Toyoda, Yasuhide Matsuno
  • Patent number: 9182688
    Abstract: An image forming apparatus, including: an electrostatic latent image bearing member; an electrostatic latent image forming unit configured to form an electrostatic latent image on the electrostatic latent image bearing member; and a developing unit containing a toner and configured to develop the electrostatic latent image with the toner to thereby form a visible image, wherein the developing unit is a contact type one-component developing unit which includes a toner bearing member being in contact with the electrostatic latent image bearing member, wherein a contact pressure between the electrostatic latent image bearing member and the toner bearing member is 2.0×104 N/m2 to 7.5×104 N/m2, wherein the toner contains a binder resin and a releasing agent, and wherein an extracted amount of the releasing agent extracted with hexane from the toner is 10 mg/g to 25 mg/g.
    Type: Grant
    Filed: November 25, 2013
    Date of Patent: November 10, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Takuya Kadota, Yoshihiro Mikuriya, Tsuyoshi Nozaki, Yoshimichi Ishikawa, Kazuoki Fuwa, Tomohiro Fukao, Yuta Takeuchi, Tomoharu Miki, Takayuki Nakamura, Naoki Nakatake, Yasuhide Matsuno
  • Patent number: 9164435
    Abstract: A fixing device includes a nip formation pad disposed opposite an inner circumferential surface of an endless belt and a pressing rotary body pressed against the nip formation pad via the endless belt to form a fixing nip between the endless belt and the pressing rotary body, through which a recording medium is conveyed. The pressing rotary body has a diameter increasing from a center to each lateral end in an axial direction thereof. The nip formation pad includes a projection disposed downstream from a rotation axis of the pressing rotary body in a recording medium conveyance direction. The projection projects toward the pressing rotary body in an amount increasing from each lateral end to a center in a longitudinal direction of the nip formation pad parallel to the axial direction of the pressing rotary body.
    Type: Grant
    Filed: November 19, 2013
    Date of Patent: October 20, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoya Adachi, Atsushi Takehara, Tomohiko Fujii, Yutaka Naitoh, Minoru Toyoda, Hitoshi Fujiwara, Yasuharu Kawarasaki, Naoki Nakatake, Keiji Kunimi, Takahiro Sanada, Yasuhide Matsuno, Rumi Miyazaki, Kyoko Abe, Takeshi Yamashita, Yasuhiro Fujiwara
  • Patent number: 9116460
    Abstract: An image forming apparatus includes a latent image forming device that forms a latent image, a latent image carrier that carries the latent image, a development device that develops the latent image, and a controller. The development device includes a developer carrier that faces the latent image carrier and carries toner on a rotary surface thereof that rotates in a rotation direction perpendicular to a width direction of the developer carrier, and a regulation member that regulates the thickness of a layer of the toner on the surface of the developer carrier. The controller moves the toner on lateral end regions in the width direction of the surface of the developer carrier toward the latent image carrier. The end regions are located outside a maximum image forming region within a regulation member facing region of the surface of the developer carrier facing the regulation member.
    Type: Grant
    Filed: November 27, 2013
    Date of Patent: August 25, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuhide Matsuno, Naoki Nakatake, Yuji Nagatomo, Takahiro Sanada
  • Publication number: 20150234348
    Abstract: An image forming apparatus includes a latent image bearer, a charging roller, a first cleaner, a second cleaner, and a rotation controller. The latent image bearer bears a latent image on a surface thereof. The charging roller charges the latent image bearer. The first cleaner cleans the surface of the latent image bearer. The second cleaner cleans a surface of the charging roller. The rotation controller controls the latent image bearer to execute a set of backward rotation and first forward rotation at least once during a non-image formation time period, and either temporarily stop and start second forward rotation or continuously execute the second forward rotation by a rotation distance corresponding to at least one rotation of the charging roller.
    Type: Application
    Filed: February 10, 2015
    Publication date: August 20, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Masanari FUJITA, Yasuhide MATSUNO, Shin MURAYAMA, Shin YAMAMOTO, Shinichi ARASAWA
  • Publication number: 20150117901
    Abstract: A process unit includes a rotatable image bearer to bear a toner image on a surface thereof; a developer bearer to supply developer to the image bearer and including a first range, a second range different in property from the first range and adjacent to the first range on an outer side in an axial direction via a first boundary, and a second boundary on an outer side of the first boundary in the axial direction; a cleaning member to remove residual developer from the image bearer; and an abutment part disposed to contact the surface of the image bearer to remove a foreign substance from the image bearer. The abutment part is disposed astride at least one of a first position on the image bearer corresponding to the first boundary, and a second position on the image bearer corresponding to the second boundary.
    Type: Application
    Filed: October 6, 2014
    Publication date: April 30, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Mitsutoshi KICHISE, Kenji NAKAMURA, Takeshi YAMASHITA, Tamotsu IKEDA, Minoru TOYODA, Yasuhide MATSUNO
  • Patent number: 9007409
    Abstract: An optical writing head positioning mechanism includes spacers provided between a latent image carrier for carrying an electrostatic latent image and an optical writing head for exposing the latent image carrier. The spacers each include at least one carrier contact surface that contacts the latent image carrier and at least one head contact surface that contacts the optical writing head to determine an interval between the latent image carrier and the optical writing head. The latent image carrier is in contact with a cleaning member that cleans a cleaning area on a surface of the latent image carrier. In at least one of the spacers, the at least one carrier contact surface includes plural carrier contact surfaces not disposed on edges of the cleaning area, and one of the edges of the cleaning area is located between two adjacent ones of the plural carrier contact surfaces.
    Type: Grant
    Filed: July 8, 2014
    Date of Patent: April 14, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Kenji Nakamura, Tamotsu Ikeda, Yasuhide Matsuno, Minoru Toyoda, Masanari Fujita, Takahiro Yoshimi
  • Patent number: 8983323
    Abstract: Provided is a color image forming apparatus that includes: image carriers that form toner image of black and other colors; an intermediate transfer body that makes contact with the image carriers; and transfer units that transfer the toner images on the image carriers to the intermediate transfer body. A line velocity difference is set between the image carriers and the intermediate transfer body. An accelerated cohesion degree of toner is equal to or larger than 54%. A linear velocity difference X1 between the image carrier for black and the intermediate transfer body satisfies a relation of 0<X1?1.2 mm/sec. A linear velocity difference X2 between the image carriers for the colors and the intermediate transfer body satisfies a relation of 2.1?X2?4.0 mm/sec.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: March 17, 2015
    Assignee: Ricoh Company, Limited
    Inventors: Takeshi Yamashita, Yuji Nagatomo, Naoki Nakatake, Yasuhiro Fujiwara, Takafumi Miyazaki, Yasuhide Matsuno, Takahiro Sanada, Rumi Miyazaki, Kyoko Abe, Tomoya Adachi, Yoshie Iwakura
  • Patent number: 8971743
    Abstract: An image forming apparatus including a latent image bearing member, a charger, a latent image forming device, a developing device, and a transfer device is provided. The transfer device is adapted to transfer a toner image formed on the latent image bearing member onto an intermediate transfer member or a recording medium by action of a transfer elected field in a transfer position where the latent image bearing member faces the transfer device. When a non-charged portion of the latent image bearing member that has not been charged to a predetermined potential by the charger passes through the transfer position, a strength of the transfer electric field is lowered than that in transferring the toner image.
    Type: Grant
    Filed: March 25, 2013
    Date of Patent: March 3, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Takafumi Miyazaki, Naoki Nakatake, Yuji Nagatomo, Yasuhide Matsuno, Takahiro Sanada, Yasuhiro Fujiwara, Kyoko Abe, Takeshi Yamashita, Tomoya Adachi
  • Publication number: 20150055987
    Abstract: A developing device includes a developer bearer and a regulation member. The developer bearer bears developer on a surface thereof. The developer bearer is rotatable forward and in reverse. The regulation member is disposed in contact or non-contact with the surface of the developer bearer to regulate amount of the developer on the developer bearer. In a non-development period, when the developer bearer rotates in a direction of reverse rotation opposite to a direction of forward rotation in which the developer bearer rotates in a development period, the developer bearer stops a series of rotating operations after the developer bearer rotates in the direction of forward rotation as a last rotating operation. A total rotation amount of forward rotation is set to be greater than a total rotation amount of reverse rotation in the series of rotating operations.
    Type: Application
    Filed: August 11, 2014
    Publication date: February 26, 2015
    Inventors: Yoshio SAKAGAWA, Shin Murayama, Yasuhide Matsuno
  • Publication number: 20150035928
    Abstract: An optical writing head positioning mechanism includes spacers provided between a latent image carrier for carrying an electrostatic latent image and an optical writing head for exposing the latent image carrier. The spacers each include at least one carrier contact surface that contacts the latent image carrier and at least one head contact surface that contacts the optical writing head to determine an interval between the latent image carrier and the optical writing head. The latent image carrier is in contact with a cleaning member that cleans a cleaning area on a surface of the latent image carrier. In at least one of the spacers, the at least one carrier contact surface includes plural carrier contact surfaces not disposed on edges of the cleaning area, and one of the edges of the cleaning area is located between two adjacent ones of the plural carrier contact surfaces.
    Type: Application
    Filed: July 8, 2014
    Publication date: February 5, 2015
    Applicant: RICOH COMPANY, LTD.
    Inventors: Kenji NAKAMURA, Tamotsu IKEDA, Yasuhide MATSUNO, Minoru TOYODA, Masanari FUJITA, Takahiro YOSHIMI
  • Patent number: 8867971
    Abstract: A developer regulator to restrict an amount of a developer, including a base portion; an intermediate portion continuous with the base portion, the intermediate portion having a flat area on one face, the flat area having a roughened surface; and a distal end continuous with the intermediate portion, the distal end being bent relative to the base portion in a direction opposite the one face in which the flat area is formed.
    Type: Grant
    Filed: August 15, 2011
    Date of Patent: October 21, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Ryuji Inoue, Yuji Nagatomo, Yasuhide Matsuno
  • Patent number: 8805222
    Abstract: An image developing device includes a developer supporting body; a first conveyance path in which a first conveyance member is arranged; a second conveyance path in which a second conveyance member is arranged; and a partition member that partitions the first conveyance path and the second conveyance path and that has a first communication port and a second communication port. The first communication path and the second communication path communicates with each other through the first communication port and the second communication port. The image developing device includes a developer amount detection unit that includes an optical detection unit arranged in the second conveyance path and that optically detects an amount of the developer in the image forming device. The developer is caused to accumulate in the vicinity of the developer amount detection unit.
    Type: Grant
    Filed: March 5, 2012
    Date of Patent: August 12, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Naoki Nakatake, Tomohiro Kubota, Shoh Tsuritani, Yuji Nagatomo, Yasuhide Matsuno, Hiroaki Katoh, Tomoya Adachi, Rumi Miyazaki, Takafumi Miyazaki, Takeshi Yamashita, Kyoko Abe, Yasuhiro Fujiwara, Takahiro Sanada
  • Publication number: 20140161471
    Abstract: An image forming apparatus includes a latent image forming device that forms a latent image, a latent image carrier that carries the latent image, a development device that develops the latent image, and a controller. The development device includes a developer carrier that faces the latent image carrier and carries toner on a rotary surface thereof that rotates in a rotation direction perpendicular to a width direction of the developer carrier, and a regulation member that regulates the thickness of a layer of the toner on the surface of the developer carrier. The controller moves the toner on lateral end regions in the width direction of the surface of the developer carrier toward the latent image carrier. The end regions are located outside a maximum image forming region within a regulation member facing region of the surface of the developer carrier facing the regulation member.
    Type: Application
    Filed: November 27, 2013
    Publication date: June 12, 2014
    Applicant: Ricoh Company, Ltd
    Inventors: Yasuhide Matsuno, Naoki Nakatake, Yuji Nagatomo, Takahiro Sanada
  • Publication number: 20140153982
    Abstract: A fixing device includes a nip formation pad disposed opposite an inner circumferential surface of an endless belt and a pressing rotary body pressed against the nip formation pad via the endless belt to form a fixing nip between the endless belt and the pressing rotary body, through which a recording medium is conveyed. The pressing rotary body has a diameter increasing from a center to each lateral end in an axial direction thereof. The nip formation pad includes a projection disposed downstream from a rotation axis of the pressing rotary body in a recording medium conveyance direction. The projection projects toward the pressing rotary body in an amount increasing from each lateral end to a center in a longitudinal direction of the nip formation pad parallel to the axial direction of the pressing rotary body.
    Type: Application
    Filed: November 19, 2013
    Publication date: June 5, 2014
    Applicant: Ricoh Company, Ltd.
    Inventors: Tomoya ADACHI, Atsushi TAKEHARA, Tomohiko FUJII, Yutaka NAITOH, Minoru TOYODA, Hitoshi FUJIWARA, Yasuharu KAWARASAKI, Naoki NAKATAKE, Keiji KUNIMI, Takahiro SANADA, Yasuhide MATSUNO, Rumi MIYAZAKI, Kyoko ABE, Takeshi YAMASHITA, Yasuhiro FUJIWARA
  • Publication number: 20140147784
    Abstract: An image forming apparatus, including: an electrostatic latent image bearing member; an electrostatic latent image forming unit configured to form an electrostatic latent image on the electrostatic latent image bearing member; and a developing unit containing a toner and configured to develop the electrostatic latent image with the toner to thereby form a visible image, wherein the developing unit is a contact type one-component developing unit which includes a toner bearing member being in contact with the electrostatic latent image bearing member, wherein a contact pressure between the electrostatic latent image bearing member and the toner bearing member is 2.0×104 N/m2 to 7.5×104 N/m2, wherein the toner contains a binder resin and a releasing agent, and wherein an extracted amount of the releasing agent extracted with hexane from the toner is 10 mg/g to 25 mg/g.
    Type: Application
    Filed: November 25, 2013
    Publication date: May 29, 2014
    Inventors: Takuya Kadota, Yoshihiro Mikuriya, Tsuyoshi Nozaki, Yoshimichi Ishikawa, Kazuoki Fuwa, Tomohiro Fukao, Yuta Takeuchi, Tomoharu Miki, Takayuki Nakamura, Naoki Nakatake, Yasuhide Matsuno