Patents by Inventor Yuusuke Okuno

Yuusuke Okuno 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: 9335711
    Abstract: A fitting structure for fitting a plate-form member to a fitting destination member such that a position of the plate-form member relative to a target member is adjustable, the fitting structure has an adjustment pin inserted, in a fashion movable in a position adjustment direction, in an adjustment hole formed in the plate-form member; and a screw member for fastening the plate-form member to the fitting destination member, wherein a direction of a force of the screw member that acts upon the plate-form member when the screw member is in a position where the screw member fastens the plate-form member points from a side where a gap formed between the adjustment pin and the adjustment hole is smaller to a side where the gap is larger.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: May 10, 2016
    Assignee: KONICA MINOLTA, INC.
    Inventors: Yuusuke Okuno, Yasuyuki Inada, Kazuki Kobori
  • Patent number: 8874008
    Abstract: Developing device supplying developer to developing roller, while causing developer to circulate in passage including first and second conveying passages in parallel, and while ejecting part of developer to outside via ejection passage formed as extension of first conveying passage on downstream side in developer conveying direction, developing roller being provided along first conveying passage.
    Type: Grant
    Filed: September 15, 2011
    Date of Patent: October 28, 2014
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventor: Yuusuke Okuno
  • Patent number: 8750764
    Abstract: A trickle-type developing device comprising: a stirring and conveying tank provided with stirring and conveying screws that circulate the developer; a discharge member via which a part of the developer is conveyed from the tank to a discharge opening through which the developer is discharged, the discharge opening being provided in the discharge member; and a reverse flow generating screw provided inside a portion of the discharge member, sharing one of rotation shafts of the stirring and conveying screws, and pushing back a part of the developer, wherein the portion has a reduced-radius part and in a cross section thereof perpendicular to an axial direction of the one of rotation shafts, an inner radius of the portion is smaller in the reduced-radius part than in the remaining part, the reduced-radius part being located in a lower part of the portion with respect to a vertical direction of the portion.
    Type: Grant
    Filed: January 13, 2012
    Date of Patent: June 10, 2014
    Assignee: Konica Minolta Business Technologies, Inc
    Inventors: Yuusuke Okuno, Wataru Watanabe
  • Publication number: 20140119781
    Abstract: A fitting structure for fitting a plate-form member to a fitting destination member such that a position of the plate-form member relative to a target member is adjustable, the fitting structure has an adjustment pin inserted, in a fashion movable in a position adjustment direction, in an adjustment hole formed in the plate-form member; and a screw member for fastening the plate-form member to the fitting destination member, wherein a direction of a force of the screw member that acts upon the plate-form member when the screw member is in a position where the screw member fastens the plate-form member points from a side where a gap formed between the adjustment pin and the adjustment hole is smaller to a side where the gap is larger.
    Type: Application
    Filed: October 23, 2013
    Publication date: May 1, 2014
    Applicant: Konica Minolta Inc.
    Inventors: Yuusuke OKUNO, Yasuyuki Inada, Kazuki Kobori
  • Patent number: 8503904
    Abstract: A developing device develops a latent image on an image carrier by using a developer. The device includes a developer carrier that faces the image carrier and is configured to rotate while magnetically holding developer on its outer circumferential surface. The device also includes a magnetic member elongated along a rotational direction of the developer carrier to form a gap that surrounds the outer circumferential surface. The magnetic member overlaps an end of a developing region in a direction of a rotational axis of the developer carrier, when viewed from a direction perpendicular to the rotational axis. When a side of the magnetic member close to a center of the developer carrier is divided into first and second sides and located downstream and upstream in the rotational direction, respectively, the first side is set back further from the center than a position where the first and second sides meet.
    Type: Grant
    Filed: March 15, 2011
    Date of Patent: August 6, 2013
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventor: Yuusuke Okuno
  • Patent number: 8406645
    Abstract: Developing bias is set as follows. An electric field intensity between a developing roller and a photoconductor is set to cause normally-charged toner to fly in an image area and not to cause the toner to fly in a background area. Thus, the normally-charged toner does not fly in the background area. The normally-charged toner caused to fly is therefore unlikely to flick low-charged toner and oppositely-charged toner. The low-charged toner and the oppositely-charged toner will not adhere to the background area and cause image fogging. Accordingly, an image forming apparatus can be provided to prevent the low-charged toner and the oppositely-charged toner from adhering to the background area of an electrostatic latent image on the photoconductor and to avoid the occurrence of image fogging in the background area on a printed material.
    Type: Grant
    Filed: May 28, 2009
    Date of Patent: March 26, 2013
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Yuusuke Okuno, Kentaro Katori, Kanji Nakayama, Tomo Kitada, Toru Hayase
  • Publication number: 20120189349
    Abstract: A trickle-type developing device comprising: a stirring and conveying tank provided with stirring and conveying screws that circulate the developer; a discharge member via which a part of the developer is conveyed from the tank to a discharge opening through which the developer is discharged, the discharge opening being provided in the discharge member; and a reverse flow generating screw provided inside a portion of the discharge member, sharing one of rotation shafts of the stirring and conveying screws, and pushing back a part of the developer, wherein the portion has a reduced-radius part and in a cross section thereof perpendicular to an axial direction of the one of rotation shafts, an inner radius of the portion is smaller in the reduced-radius part than in the remaining part, the reduced-radius part being located in a lower part of the portion with respect to a vertical direction of the portion.
    Type: Application
    Filed: January 13, 2012
    Publication date: July 26, 2012
    Applicant: Konica Minolta Business Technologies, Inc.
    Inventors: Yuusuke Okuno, Wataru Watanabe
  • Publication number: 20120070194
    Abstract: Developing device supplying developer to developing roller, while causing developer to circulate in passage including first and second conveying passages in parallel, and while ejecting part of developer to outside via ejection passage formed as extension of first conveying passage on downstream side in developer conveying direction, developing roller being provided along first conveying passage.
    Type: Application
    Filed: September 15, 2011
    Publication date: March 22, 2012
    Applicant: Konica Minolta Business Technologies, Inc.
    Inventor: Yuusuke OKUNO
  • Patent number: 8126379
    Abstract: The present invention provides a developing device which is capable of suppressing the generation of a fogging phenomenon and deposition of carrier particles to an electrostatic latent image carrier and developing the electrostatic latent image efficiently, the device includes a development sleeve and a magnet body onto which the sleeve is fitted, and using a two-component developer. An angular position which indicates the peak value of the magnetic flux density in the normal direction produced by a development pole of the magnet body is shifted downstream from the center position of the development pole in the direction of movement of the surface of a photosensitive member in a development region. The present invention also provides an image forming apparatus which can form high-quality images with reduced noise such as fogging by mounting the developing device.
    Type: Grant
    Filed: June 8, 2009
    Date of Patent: February 28, 2012
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Toru Hayase, Yuusuke Okuno, Shigeki Yamamoto, Kuniya Matsuura, Hiroshi Murasaki
  • Patent number: 8032043
    Abstract: In case new and old toners may be mixed, a developing bias is set as follows. The time is first clocked. The number of times toner is replenished from a hopper into a buffer for a clocked period is counted. If a replenishment amount per clock time is a threshold value or higher, considering that new and old toners are mixed, the setting of the developing bias is changed. An electric field intensity between a developing roller and a photoconductor is set to cause normally-charged toner to fly in an image area but not to fly in a background area. No image fogging is therefore generated in the background area. Thus, an image forming apparatus and method capable of preventing low-charged toner and oppositely-charged toner generated by mixing of new and old toners from adhering to the background area of an electrostatic latent image on the photoconductor, thereby avoiding generation of image fogging.
    Type: Grant
    Filed: June 4, 2009
    Date of Patent: October 4, 2011
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Kanji Nakayama, Noritoshi Hagimoto, Yuusuke Okuno, Tomo Kitada, Toshiya Aoki
  • Publication number: 20110229189
    Abstract: A developing device that develops a latent image on an image carrier with use of developer, comprising: a developer carrier provided to face the image carrier, and configured to rotate while magnetically holding the developer on an outer circumferential surface thereof; and a magnetic member elongated along a rotational direction of the developer carrier to surround the outer circumferential surface with a gap therebetween, wherein when viewed from a direction perpendicular to a rotational axis of the developer carrier, the magnetic member overlaps an end of a developing region in a direction of the rotational axis, and when a side of the magnetic member close to a center of the developer carrier is divided into first and second sides respectively located downstream and upstream in the rotational direction, the first side is set back further from the center than a position where the first and second sides meet each other.
    Type: Application
    Filed: March 15, 2011
    Publication date: September 22, 2011
    Applicant: Konica Minolta Business Technologies, Inc.
    Inventor: Yuusuke OKUNO
  • Patent number: 7970305
    Abstract: The development apparatus that develops an electrostatic latent image formed on an image carrier comprises: a developer roller operable to carry toner on a circumferential surface thereof and develop the electrostatic latent image using the toner; a supply roller operable to perform toner supply to the developer roller; a voltage applier operable to apply a bias voltage V1 to the developer roller and apply a bias voltage V2 to the supply roller; and a controller operable to control the voltage applier in a toner compulsive consumption mode so that a value obtained by subtracting an average S2 of the bias voltage V2 per unit time from an average S1 of the bias voltage V1 per unit time indicates the same polarity as a normal charging polarity of the toner. Here, the toner compulsive consumption mode performs development to compulsively consume the toner carried on the circumferential surface of the developer roller.
    Type: Grant
    Filed: April 4, 2008
    Date of Patent: June 28, 2011
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Yuusuke Okuno, Tomohiro Kato, Tomo Kitada, Toru Hayase
  • Patent number: 7860436
    Abstract: A developing device has a developer bearing member, a housing adapted to accommodate a developer, and a supply roller adapted to supply the developer within the housing for the developer bearing member. The supply roller has an outer circumferencial foam layer made of resin or rubber. The foam layer has an air permeability of 150-200 ml/cm2/s, a hardness of 50-200 N, and an average cell density of 20-40 per 25 mm width.
    Type: Grant
    Filed: June 13, 2007
    Date of Patent: December 28, 2010
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Tetsuo Sano, Yohei Nakade, Ichiro Demizu, Yoshikazu Aoki, Yuusuke Okuno, Takuya Okada
  • Patent number: 7853161
    Abstract: A potential difference between the photoreceptor and the development roller is set at a value at which the normally charged toner on the development roller can be flown toward the photoreceptor in the development phase at the time of compulsorily consuming the toner, and this potential difference is set at a value at which the flown normally charged toner can be returned to the development roller in the recovery phase.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: December 14, 2010
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Toru Hayase, Kuniya Matsuura, Yuusuke Okuno, Kentaro Katori, Hiromasa Ueno, Hideaki Hayashi
  • Patent number: 7693463
    Abstract: A developing device has a bearing member that can bear a toner, a storing chamber for storing the toner, a waiting chamber disposed below the storing chamber for receiving the bearing member that can be filled with the toner and a buffer chamber positioned between the storing chamber and the waiting chamber for storing the developer material. A first horizontal connecting path connects upper portions of the storing and buffer chambers, and two second connecting paths connect lower portions of the buffer chamber and the waiting chamber. A feed member feeds toner from the storing chamber through the first connecting path into the buffer chamber. A first conveying member in the buffer chamber conveys the toner from one of the connecting paths to the other of the connecting paths, and a second conveying member in the waiting chamber conveys the toner within the waiting chamber in the opposite direction.
    Type: Grant
    Filed: April 17, 2007
    Date of Patent: April 6, 2010
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Narutaka Yoshida, Tomohiro Kato, Yuusuke Okuno, Tomo Kitada
  • Patent number: 7639973
    Abstract: An image forming apparatus has an electrostatic latent image bearing member capable of bearing an electrostatic latent image thereon, and a developer apparatus having a developer material for visualizing the electrostatic latent image into a visualized image. The developer apparatus includes a developer material bearing member, a housing adapted to accommodate a developer material, and a supply roller adapted to supply the developer material within the housing for the developer material bearing member. The supply roller has an outer circumferential foam layer. The foam layer is made of resin foam or rubber foam and has an air permeability of 5 ml/cm2/s or less, a density of 50-200 kg/m3, and a hysteresis loss ratio of 35-45%.
    Type: Grant
    Filed: June 13, 2007
    Date of Patent: December 29, 2009
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Tetsuo Sano, Yohei Nakade, Ichiro Demizu, Yoshikazu Aoki, Yuusuke Okuno
  • Publication number: 20090310995
    Abstract: In case new and old toners may be mixed, a developing bias is set as follows. The time is first clocked. The number of times toner is replenished from a hopper into a buffer for a clocked period is counted. If a replenishment amount per clock time is a threshold value or higher, considering that new and old toners are mixed, the setting of the developing bias is changed. An electric field intensity between a developing roller and a photoconductor is set to cause normally-charged toner to fly in an image area but not to fly in a background area. No image fogging is therefore generated in the background area. Thus, an image forming apparatus and method capable of preventing low-charged toner and oppositely-charged toner generated by mixing of new and old toners from adhering to the background area of an electrostatic latent image on the photoconductor, thereby avoiding generation of image fogging.
    Type: Application
    Filed: June 4, 2009
    Publication date: December 17, 2009
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Kanji NAKAYAMA, Noritoshi HAGIMOTO, Yuusuke OKUNO, Tomo KITADA, Toshiya AOKI
  • Publication number: 20090311011
    Abstract: The present invention provides a developing device which is capable of suppressing the generation of a fogging phenomenon and deposition of carrier particles to an electrostatic latent image carrier and developing the electrostatic latent image efficiently, the device comprising a development sleeve and a magnet body onto which the sleeve is fitted, and using a two-component developer. An angular position which indicates the peak value of the magnetic flux density in the normal direction produced by a development pole of the magnet body is shifted downstream from the center position of the development pole in the direction of movement of the surface of a photosensitive member in a development region. The present invention also provides an image forming apparatus which can form high-quality images with reduced noise such as fogging by mounting the developing device.
    Type: Application
    Filed: June 8, 2009
    Publication date: December 17, 2009
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES,INC.
    Inventors: Toru HAYASE, Yuusuke Okuno, Shigeki Yamamoto, Kuniya Matsuura, Hiroshi Murasaki
  • Publication number: 20090304404
    Abstract: Developing bias is set as follows. An electric field intensity between a developing roller and a photoconductor is set to cause normally-charged toner to fly in an image area and not to cause the toner to fly in a background area. Thus, the normally-charged toner does not fly in the background area. The normally-charged toner caused to fly is therefore unlikely to flick low-charged toner and oppositely-charged toner. The low-charged toner and the oppositely-charged toner will not adhere to the background area and cause image fogging. Accordingly, an image forming apparatus can be provided to prevent the low-charged toner and the oppositely-charged toner from adhering to the background area of an electrostatic latent image on the photoconductor and to avoid the occurrence of image fogging in the background area on a printed material.
    Type: Application
    Filed: May 28, 2009
    Publication date: December 10, 2009
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Yuusuke OKUNO, Kentaro Katori, Kanji Nakayama, Tomo Kitada, Toru Hayase
  • Publication number: 20090175636
    Abstract: To prevent image defects such as fog and irregularities caused by the accumulation of the oppositely charged toner by flying the toner toward a photoreceptor to compulsorily consume the toner even though the toner is oppositely charged toner having a small charged amount. A potential difference between the photoreceptor and the development roller is set at a value at which the normally charged toner on the development roller can be flown toward the photoreceptor in the development phase at the time of compulsorily consuming the toner, and this potential difference is set at a value at which the flown normally charged toner can be returned to the development roller in the recovery phase.
    Type: Application
    Filed: December 11, 2008
    Publication date: July 9, 2009
    Applicant: Konica Minolta Business Technologies, Inc.
    Inventors: Toru Hayase, Kuniya Matsuura, Yuusuke Okuno, Kentaro Katori, Hiromasa Ueno, Hideaki Hayashi