Patents by Inventor Tomohiro Ohshima

Tomohiro Ohshima 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: 9658565
    Abstract: A developing device includes a development unit, a developer amount detector, an accuracy requirement determiner, and a detection count setting unit. The development unit includes a developer container configured to store a developer. The development unit is configured to supply the developer from the developer container to a latent image bearer, on which an electrostatic latent image is to be formed according to image data, to form a developer image. The developer amount detector is configured to detect a developer amount in the toner container of the development unit in every detection period. The accuracy requirement determiner is configured to a determine accuracy requirement required as a detection accuracy of the developer amount by the developer amount detector. The detection count setting unit is configured to set a number of times of detection of the developer amount by the developer amount detector based on the accuracy requirement.
    Type: Grant
    Filed: February 22, 2016
    Date of Patent: May 23, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Takashi Oida, Shoh Tsuritani, Tomohiro Ohshima, Akinori Yamaguchi, Mizuho Ohmura
  • Patent number: 9576746
    Abstract: An energy storage module in which a plurality of energy storage cells including electrode terminals are stacked, includes a bus bar that electrically connects a plurality of electrode terminals, a conductive member that is secured on the bus bar, a detection section that detects a voltage of each of the energy storage cells, and a wiring board, a wire that is electrically connected to the detection section, and a pad that is connected to the wire being formed on the wiring board, the conductive member coming in contact with the pad.
    Type: Grant
    Filed: April 12, 2012
    Date of Patent: February 21, 2017
    Assignee: JM Energy Corporation
    Inventors: Naoki Ueno, Kazuhiro Ohhashi, Tomohiro Ohshima, Kenji Nansaka
  • Patent number: 9516192
    Abstract: An image forming apparatus comprising: a resolution conversion unit configured to convert the resolution of a pixel provided by input image data; a gradation conversion unit configured to perform matrix conversion onto the pixel; and a writing unit configured to perform a write operation, wherein, in the normal mode, the gradation conversion unit performs matrix conversion onto the pixel with reference to the gradation conversion table for the normal mode, and the writing unit performs the write operation of the pixel in a normal order that is the order image data being input into the image forming apparatus, and in the reverse mode, the gradation conversion unit performs matrix conversion onto the pixel with reference to the gradation conversion table for the reverse mode, and the writing unit performs the write operation of the pixel in a reverse order opposite to the normal order.
    Type: Grant
    Filed: September 11, 2013
    Date of Patent: December 6, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Masayuki Hayashi, Yoshinori Shirasaki, Tatsuya Miyadera, Motohiro Kawanabe, Hiroaki Ikeda, Akinori Yamaguchi, Tomohiro Ohshima
  • Publication number: 20160246213
    Abstract: A developing device includes a development unit, a developer amount detector, an accuracy requirement determiner, and a detection count setting unit. The development unit includes a developer container configured to store a developer. The development unit is configured to supply the developer from the developer container to a latent image bearer, on which an electrostatic latent image is to be formed according to image data, to form a developer image. The developer amount detector is configured to detect a developer amount in the toner container of the development unit in every detection period. The accuracy requirement determiner is configured to a determine accuracy requirement required as a detection accuracy of the developer amount by the developer amount detector. The detection count setting unit is configured to set a number of times of detection of the developer amount by the developer amount detector based on the accuracy requirement.
    Type: Application
    Filed: February 22, 2016
    Publication date: August 25, 2016
    Inventors: Takashi OIDA, Shoh TSURITANI, Tomohiro OHSHIMA, Akinori YAMAGUCHI, Mizuho OHMURA
  • Patent number: 9104127
    Abstract: An image forming apparatus comprises: an image forming unit configured to form an image quality adjustment pattern image on an image carrier to be driven at a predetermined speed; a detector configured to detect the image quality adjustment pattern image; an image quality adjustment controller configured to control image quality adjustment processing in accordance with a detection result by the detector; a speed change unit configured to change an image formation speed indicating a speed at which an image is formed, and an interval change unit configured to change an interval at which the detector acquires a detection result in accordance with a change amount between the image formation speed before changed by the speed change unit and the image formation speed after changed.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: August 11, 2015
    Assignee: RICOH COMPANY, LIMITED
    Inventors: Akinori Yamaguchi, Hiroaki Ikeda, Tomohiro Ohshima, Masayuki Hayashi, Tatsuya Miyadera, Motohiro Kawanabe, Yoshinori Shirasaki
  • Patent number: 8957933
    Abstract: An optical writing device forming an electrical latent image on a photoreceptor includes an optical writing unit configured to apply light to the photoreceptor, a power supply unit configured to supply power to the optical writing unit, a power supply status detector configured to detect a power supply status of the power supplied from the power supply unit to the optical writing unit, and output power supply information or power cutoff information, a power cutoff information retaining unit configured to retain the power cutoff information when the power cutoff information is output from the power supply status detector, and a power sensor configured to sense a power supply status of the power supplied by the power supply unit based on the power cutoff information retained by the power cutoff information retaining unit.
    Type: Grant
    Filed: August 6, 2013
    Date of Patent: February 17, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshinori Shirasaki, Tatsuya Miyadera, Masayuki Hayashi, Motohiro Kawanabe, Hiroaki Ikeda, Tomohiro Ohshima, Akinori Yamaguchi
  • Patent number: 8848238
    Abstract: An optical writing control device includes: a light emission control unit which controls light emission of multiple light sources for respective different colors and exposes multiple image carriers; and a correction amount calculating unit which calculates a correction amount for each of the different colors on the basis of a difference between a central value of a distribution range of positional deviation amounts in a sub-scanning direction for the respective different colors and the positional deviation amount for a corresponding color. The light emission control unit delays light emitting timing of a light source, which is to be delayed, by delaying reading timing of pixel information stored in a storage medium, and delays timing at which the pixel information about colors other than a color, light emitting timing of a light source for which is to be advanced, starts to be obtained from an image forming apparatus main body.
    Type: Grant
    Filed: June 17, 2013
    Date of Patent: September 30, 2014
    Assignee: Ricoh Company, Limited
    Inventors: Tatsuya Miyadera, Motohiro Kawanabe, Masayuki Hayashi, Yoshinori Shirasaki, Hiroaki Ikeda, Akinori Yamaguchi, Tomohiro Ohshima
  • Patent number: 8744293
    Abstract: An image forming apparatus includes: a photosensitive element; a writing light source; a conveying unit; a light-emitting unit; a detection unit; a writing control unit; and an adjustment unit. The detection unit detects reflected light from a recording medium. The writing control unit controls the writing light source based on operational timing when a signal output from the detection unit turns to a fixed threshold. The adjustment unit acquires information of a gloss level of the recording medium, and adjusts light emission intensity of the light-emitting unit according to the acquired information of the gloss level in such a manner that a signal output from the detection unit when the light-emitting unit irradiates a plain region of the recording medium approximates a certain reference value.
    Type: Grant
    Filed: April 25, 2011
    Date of Patent: June 3, 2014
    Assignee: Ricoh Company, Limited
    Inventors: Yoshinori Shirasaki, Tatsuya Miyadera, Tomohiro Ohshima
  • Publication number: 20140120392
    Abstract: An energy storage module in which a plurality of energy storage cells including electrode terminals are stacked, includes a bus bar that electrically connects a plurality of electrode terminals, a conductive member that is secured on the bus bar, a detection section that detects a voltage of each of the energy storage cells, and a wiring board, a wire that is electrically connected to the detection section, and a pad that is connected to the wire being formed on the wiring board, the conductive member coming in contact with the pad.
    Type: Application
    Filed: April 12, 2012
    Publication date: May 1, 2014
    Applicant: JM Energy Corporation
    Inventors: Naoki Ueno, Kazuhiro Ohhashi, Tomohiro Ohshima, Kenji Nansaka
  • Publication number: 20140078521
    Abstract: An image forming apparatus comprising: a resolution conversion unit configured to convert the resolution of a pixel provided by input image data; a gradation conversion unit configured to perform matrix conversion onto the pixel; and a writing unit configured to perform a write operation, wherein, in the normal mode, the gradation conversion unit performs matrix conversion onto the pixel with reference to the gradation conversion table for the normal mode, and the writing unit performs the write operation of the pixel in a normal order that is the order image data being input into the image forming apparatus, and in the reverse mode, the gradation conversion unit performs matrix conversion onto the pixel with reference to the gradation conversion table for the reverse mode, and the writing unit performs the write operation of the pixel in a reverse order opposite to the normal order.
    Type: Application
    Filed: September 11, 2013
    Publication date: March 20, 2014
    Inventors: Masayuki HAYASHI, Yoshinori Shirasaki, Tatsuya Miyadera, Motohiro Kawanabe, Hiroaki Ikeda, Akinori Yamaguchi, Tomohiro Ohshima
  • Publication number: 20140049591
    Abstract: An optical writing device forming an electrical latent image on a photoreceptor includes an optical writing unit configured to apply light to the photoreceptor, a power supply unit configured to supply power to the optical writing unit, a power supply status detector configured to detect a power supply status of the power supplied from the power supply unit to the optical writing unit, and output power supply information or power cutoff information, a power cutoff information retaining unit configured to retain the power cutoff information when the power cutoff information is output from the power supply status detector, and a power sensor configured to sense a power supply status of the power supplied by the power supply unit based on the power cutoff information retained by the power cutoff information retaining unit.
    Type: Application
    Filed: August 6, 2013
    Publication date: February 20, 2014
    Applicant: Ricoh Company, Ltd.
    Inventors: Yoshinori SHIRASAKI, Tatsuya MIYADERA, Masayuki HAYASHI, Motohiro KAWANABE, Hiroaki IKEDA, Tomohiro OHSHIMA, Akinori YAMAGUCHI
  • Patent number: 8638481
    Abstract: An optical writing control apparatus controls a light source to draw a correction pattern for correcting a parameter value of an image forming mechanism, detects the correction pattern transferred onto a conveyance member from a photosensitive member based on an output signal of a sensor, and corrects the parameter value based on the detected correction pattern; stores chromatic color progress information indicating a progress for a chromatic color mechanism corresponding to a chromatic color image occurring from when the correction operation was carried out and achromatic color progress information indicating a progress for an achromatic color mechanism corresponding to an achromatic color image occurring from when the correction operation was carried out; and stores a necessary threshold to determine that the correction operation is necessary and an unnecessary threshold to determine that the correction operation is unnecessary for the chromatic color progress information and the achromatic color progress i
    Type: Grant
    Filed: March 10, 2011
    Date of Patent: January 28, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Tatsuya Miyadera, Yoshinori Shirasaki, Tomohiro Ohshima
  • Publication number: 20140002564
    Abstract: An optical writing control device includes: a light emission control unit which controls light emission of multiple light sources for respective different colors and exposes multiple image carriers; and a correction amount calculating unit which calculates a correction amount for each of the different colors on the basis of a difference between a central value of a distribution range of positional deviation amounts in a sub-scanning direction for the respective different colors and the positional deviation amount for a corresponding color. The light emission control unit delays light emitting timing of a light source, which is to be delayed, by delaying reading timing of pixel information stored in a storage medium, and delays timing at which the pixel information about colors other than a color, light emitting timing of a light source for which is to be advanced, starts to be obtained from an image forming apparatus main body.
    Type: Application
    Filed: June 17, 2013
    Publication date: January 2, 2014
    Inventors: Tatsuya MIYADERA, Motohiro Kawanabe, Masayuki Hayashi, Yoshinori Shirasaki, Hiroaki Ikeda, Akinori Yamaguchi, Tomohiro Ohshima
  • Publication number: 20130343775
    Abstract: An image forming apparatus comprises: an image forming unit configured to form an image quality adjustment pattern image on an image carrier to be driven at a predetermined speed; a detector configured to detect the image quality adjustment pattern image; an image quality adjustment controller configured to control image quality adjustment processing in accordance with a detection result by the detector; a speed change unit configured to change an image formation speed indicating a speed at which an image is formed, and an interval change unit configured to change an interval at which the detector acquires a detection result in accordance with a change amount between the image formation speed before changed by the speed change unit and the image formation speed after changed.
    Type: Application
    Filed: June 14, 2013
    Publication date: December 26, 2013
    Inventors: Akinori YAMAGUCHI, Hiroaki IKEDA, Tomohiro OHSHIMA, Masayuki HAYASHI, Tatsuya MIYADERA, Motohiro KAWANABE, Yoshinori SHIRASAKI
  • Patent number: 8543020
    Abstract: An image forming apparatus includes a transport member, image forming units (used as pattern forming unit), a pattern detector, and an image misalignment detector. The image forming units form correction-use patterns for each color on the transport member. The pattern detector directs a light beam onto the transport member having the correction-use patterns and detect reflected light reflecting from the transport member. The image misalignment detector detects image misalignment of the correction-use patterns. The pattern forming unit forms a reference color pattern and a first color pattern. The pattern detector uses an irradiation light having a first wavelength matched to a spectral sensitivity peak of the first color pattern to detect an intensity of reflected light reflected from the transport member. The image misalignment detector computes an image misalignment value between the reference and first color patterns based on the intensity of reflected light reflected from the transport member.
    Type: Grant
    Filed: March 15, 2010
    Date of Patent: September 24, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Tatsuya Miyadera, Tomohiro Ohshima
  • Patent number: 8488201
    Abstract: An image forming apparatus for which a first mode using toners of plural colors including a black toner and a second mode using only the black toner can be set, includes a first printing cumulatively counting part that cumulatively counts a first number of pages for which image forming has been executed by using the toners of plural colors; a first printing determining part that determines whether the first number of pages counted by the first printing cumulatively counting part has exceeded a threshold; and a correction control part that controls not to execute a correcting process for image forming that uses the toners of plural colors but to execute a correcting process for image forming that uses only the black toner, when the second mode has been set in a case where the first printing determining part has determined that the first number of pages has exceeded the threshold.
    Type: Grant
    Filed: July 30, 2010
    Date of Patent: July 16, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Tatsuya Miyadera, Yoshinori Shirasaki, Tomohiro Ohshima
  • Patent number: 8369725
    Abstract: An image forming apparatus includes an image forming unit, a first detector including a first light emitting device, a first mixed-light receiving device and a first diffuse reflection light receiving device, a second detector including a second light emitting device and a second mixed-light receiving device, and a concentration correction unit. The first mixed-light receiving device detects a mixed light including regular and diffuse reflection light reflected from a transport member. The first diffuse reflection light receiving device detects the diffuse reflection light. The second mixed-light receiving device detects the mixed light. The concentration correction unit conducts concentration correction using detection results of the first and second detectors.
    Type: Grant
    Filed: August 27, 2010
    Date of Patent: February 5, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomohiro Ohshima, Tatsuya Miyadera, Yoshinori Shirasaki
  • Publication number: 20130004194
    Abstract: An image forming apparatus includes an image forming unit that forms developer images in different colors on image carriers; a first transfer unit that transfers the developer images onto an endless conveying body; a second transfer unit that transfers the developer images onto a recording medium; pattern detecting units that irradiate a given developer pattern formed on the endless conveying body with a light beam and detect reflected light from the pattern; a cleaning unit that cleans developer images adhered to the second transfer unit; and a control unit that controls each of the units. The pattern detecting units are arranged between the second transfer unit and the image carrier on the most upstream side from the second transfer unit in a rotation direction of the endless conveying body. The control unit changes a cleaning time of the cleaning unit based on a detection result of the pattern detecting units.
    Type: Application
    Filed: March 10, 2011
    Publication date: January 3, 2013
    Inventors: Yoshinori Shirasaki, Tatsuya Miyadera, Tomohiro Ohshima
  • Publication number: 20120105896
    Abstract: An image forming apparatus includes: a detecting unit that detects illuminance; a storage unit that stores therein a threshold with respect to the illuminance in accordance with a distance from a light source to the image forming apparatus, the threshold being for switching to an energy-saving mode in which electricity is supplied only to a part of the image forming apparatus or for turning, off a power source; a comparison unit that compares a detected illuminance with the threshold; and a control unit that, if the detected illuminance is equal to or less than the threshold, causes the image forming apparatus to switch to the energy-saving mode or to turn off the power source.
    Type: Application
    Filed: October 21, 2011
    Publication date: May 3, 2012
    Applicant: RICOH COMPANY, LIMITED
    Inventors: Mitsuo Ito, Masato Kobayashi, Tomohiro Ohshima
  • Publication number: 20110268461
    Abstract: An image forming apparatus includes: a photosensitive element; a writing light source; a conveying unit; a light-emitting unit; a detection unit; a writing control unit; and an adjustment unit. The detection unit detects reflected light from a recording medium. The writing control unit controls the writing light source based on operational timing when a signal output from the detection unit turns to a fixed threshold. The adjustment unit acquires information of a gloss level of the recording medium, and adjusts light emission intensity of the light-emitting unit according to the acquired information of the gloss level in such a manner that a signal output from the detection unit when the light-emitting unit irradiates a plain region of the recording medium approximates a certain reference value.
    Type: Application
    Filed: April 25, 2011
    Publication date: November 3, 2011
    Applicant: Ricoh Company, Limited
    Inventors: Yoshinori Shirasaki, Tatsuya Miyadera, Tomohiro Ohshima