Patents by Inventor Osamu Iwasaki

Osamu Iwasaki 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: 20190273516
    Abstract: According to one embodiment, a nonvolatile memory includes a plurality of memory areas and controller circuit including an error correction code encoder. The error correction code encoder encodes a first data to generate a first parity in a first operation and encodes a second data to generate a second parity in a second operation. The controller circuit writes the first data and the first parity into a first memory area among the plurality of memory areas and writes the second data and the second parity into a second memory area among the plurality of memory areas. The size of the second data is smaller than the size of the first data and the size of the second parity is equal to the size of the first parity.
    Type: Application
    Filed: May 22, 2019
    Publication date: September 5, 2019
    Applicant: Toshiba Memory Corporation
    Inventors: Riki SUZUKI, Toshikatsu Hida, Osamu Torii, Hiroshi Yao, Kiyotaka Iwasaki
  • Publication number: 20190195123
    Abstract: To provide a tensioner that has a simple structure and is easy to assemble, and is configured to smoothly relieve pressure during oil release with reduced flow resistance so that the oil pressure in an oil pressure chamber is kept stable in a favorable manner. A relief valve unit includes a cap member that fits with a seat member to retain a stopper member inside the seat member. An external relief hole, which causes a relief-side space in a plunger hole to communicate with the outside of a plunger, opens radially in an outer circumferential surface of the plunger.
    Type: Application
    Filed: December 19, 2018
    Publication date: June 27, 2019
    Applicant: TSUBAKIMOTO CHAIN CO.
    Inventors: Yoshitaka Iwasaki, Masanori Watanabe, Osamu Yoshida, Yuji Kurematsu
  • Patent number: 10207506
    Abstract: There is provided an inkjet printing apparatus that can execute a recovery process appropriate for a print head according to a use condition of the inkjet printing apparatus. Therefore a recovery operation is performed based upon both an elapsed time in a non-use state where the printing is not performed and an elapsed time from the previous recovery process.
    Type: Grant
    Filed: August 18, 2015
    Date of Patent: February 19, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Osamu Iwasaki, Tomoyuki Tenkawa, Atsushi Takahashi, Kei Kosaka
  • Patent number: 9501000
    Abstract: The present invention relates to an image forming apparatus that forms an image by consecutively superposing toner images that have been formed on a plurality of photosensitive drums, on an intermediate transfer member or a transfer medium. The image forming apparatus is made compact and operates at a low cost. Since a current supply member supplies a current in a rotational direction of an intermediate transfer belt, multiple first transfer portions do not need corresponding voltage sources. Even in the case where a charging member supplies a current, the potential of the intermediate transfer belt is maintained at a predetermined potential by a constant-voltage element connected to support rollers.
    Type: Grant
    Filed: November 13, 2015
    Date of Patent: November 22, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kenji Karashima, Satoshi Tsuruya, Yoshikuni Ito, Yasuhiro Horiguchi, Takeshi Fujino, Takahiro Kawamoto, Takayuki Tanaka, Osamu Iwasaki, Kazunari Hagiwara
  • Patent number: 9411085
    Abstract: A large-sized thin light guide plate has a first layer on a light exit surface side and a second layer on a rear surface side containing scattering particles at a higher particle concentration than the first layer. Thicknesses of the layers in a direction substantially perpendicular to the light exit surface change to change a combined particle concentration. The scattering particles, obtained by mixing a particle group with an average particle size Ds of less than 7 ?m having one or more local maximum values and a particle group with an average particle size Db of more than 7 ?m having one or more local maximum values, satisfy 1 ?m?Ds<7 ?m, 7 ?m<Db?12 ?m and 0.3?a?0.5. High light use efficiency, reduction of luminance and color unevenness, a convex brightness distribution and easy manufacture can be achieved.
    Type: Grant
    Filed: November 18, 2014
    Date of Patent: August 9, 2016
    Assignee: FUJIFILM Corporation
    Inventor: Osamu Iwasaki
  • Publication number: 20160070194
    Abstract: The present invention relates to an image forming apparatus that forms an image by consecutively superposing toner images that have been formed on a plurality of photosensitive drums, on an intermediate transfer member or a transfer medium. The image forming apparatus is made compact and operates at a low cost. Since a current supply member supplies a current in a rotational direction of an intermediate transfer belt, multiple first transfer portions do not need corresponding voltage sources. Even in the case where a charging member supplies a current, the potential of the intermediate transfer belt is maintained at a predetermined potential by a constant-voltage element connected to support rollers.
    Type: Application
    Filed: November 13, 2015
    Publication date: March 10, 2016
    Inventors: Kenji Karashima, Satoshi Tsuruya, Yoshikuni Ito, Yasuhiro Horiguchi, Takeshi Fujino, Takahiro Kawamoto, Takayuki Tanaka, Osamu Iwasaki, Kazunari Hagiwara
  • Publication number: 20160052278
    Abstract: There is provided an inkjet printing apparatus that can execute a recovery process appropriate for a print head according to a use condition of the inkjet printing apparatus. Therefore a recovery operation is performed based upon both an elapsed time in a non-use state where the printing is not performed and an elapsed time from the previous recovery process.
    Type: Application
    Filed: August 18, 2015
    Publication date: February 25, 2016
    Inventors: Osamu Iwasaki, Tomoyuki Tenkawa, Atsushi Takahashi, Kei Kosaka
  • Patent number: 9217962
    Abstract: The present invention relates to an image forming apparatus that forms an image by consecutively superposing toner images that have been formed on a plurality of photosensitive drums, on an intermediate transfer member or a transfer medium. The image forming apparatus is made compact and operates at a low cost. Since a current supply member supplies a current in a rotational direction of an intermediate transfer belt, multiple first transfer portions do not need corresponding voltage sources. Even in the case where a charging member supplies a current, the potential of the intermediate transfer belt is maintained at a predetermined potential by a constant-voltage element connected to support rollers.
    Type: Grant
    Filed: December 9, 2011
    Date of Patent: December 22, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kenji Karashima, Satoshi Tsuruya, Yoshikuni Ito, Yasuhiro Horiguchi, Takeshi Fujino, Takahiro Kawamoto, Takayuki Tanaka, Osamu Iwasaki, Kazunari Hagiwara
  • Patent number: 9174436
    Abstract: A printing apparatus, comprising a driving unit for driving a printhead including a plurality of nozzles each of which prints a dot, a conveying unit for conveying a printing medium, a memory and a unit, wherein the plurality of nozzles are arranged to form nozzle arrays adjacent to each other, the unit performs a first operation for developing printing data column by column on the memory, a second operation for assigning the printing data to each nozzle array, and a third operation for controlling the driving unit based on the assigned printing data, and, after the first operation and before the second operation, the unit specifies a portion of the printing data corresponding to a dot deviated from a correct printing region due to a tilt of the nozzle arrays and rearranges the portion.
    Type: Grant
    Filed: December 2, 2014
    Date of Patent: November 3, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Fumiko Suzuki, Osamu Iwasaki, Atsuhiko Masuyama, Satoshi Masuda
  • Patent number: 9116265
    Abstract: There is provided a planar lighting device which can emit light with high light use efficiency and small luminance unevenness. This object is achieved by having a light guide plate including two or more layers overlapping in a direction perpendicular to a light exit surface and having different particle concentrations of the scattering particles, thicknesses of the layers in the direction perpendicular to the light exit surface varying so that a combined particle concentration has, in a direction perpendicular to a light incidence surface, a first local maximum value closer to the light incidence surface and a second local maximum value located farther from the light incidence surface than the first local maximum value and being larger than the first local maximum value; and a micro-lens film having a plurality of spherical micro-ball lenses formed on a film.
    Type: Grant
    Filed: September 25, 2013
    Date of Patent: August 25, 2015
    Assignee: FUJIFILM Corporation
    Inventor: Osamu Iwasaki
  • Patent number: 9108403
    Abstract: A printing apparatus including a print head including nozzle groups each having nozzles, each of the nozzle groups applying ink having a plurality of volumes from the nozzles to form dots including dots differing in size, including: an arrangement determination unit to determine an arrangement of dots to be formed by each of the nozzle groups; a size determination unit to determine sizes of ink ejected to print the dots determined by the arrangement determination unit, according to respective ejection characteristics of the nozzle groups, such that a print characteristic of an image based on the dot arrangement determined by the arrangement determination unit is within a predetermined range; and an ejection control unit to control the print head to eject ink having the plurality of sizes determined by the size determination unit in positions of a print medium based on the arrangement determined by the arrangement determination unit.
    Type: Grant
    Filed: October 4, 2013
    Date of Patent: August 18, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Norihiro Kawatoko, Masashi Hayashi, Hitoshi Nishikori, Osamu Iwasaki, Tomoki Yamamuro, Atsuhiko Masuyama, Fumiko Suzuki, Satoshi Masuda
  • Patent number: 9075176
    Abstract: The light guide plate has a first light incidence surface and a second light incidence surface which are provided on end sides of a light exit surface and are orthogonal to each other. The light guide plate includes two or more layers superposed on each other in a direction substantially perpendicular to the light exit surface and containing scattering particles at different particle concentrations. The thicknesses of the two or more layers in the direction substantially perpendicular to the light exit surface change so that a combined particle concentration of the light guide plate has, in directions perpendicular to the light incidence surfaces, a first local maximum value located on sides closer to the light incidence surfaces and a second local maximum value located at positions farther from the light incidence surfaces than positions of the first local maximum value and being larger than the first local maximum value.
    Type: Grant
    Filed: September 10, 2013
    Date of Patent: July 7, 2015
    Assignee: FUJIFILM Corporation
    Inventor: Osamu Iwasaki
  • Publication number: 20150158291
    Abstract: A printing apparatus, comprising a driving unit for driving a printhead including a plurality of nozzles each of which prints a dot, a conveying unit for conveying a printing medium, a memory and a unit, wherein the plurality of nozzles are arranged to form nozzle arrays adjacent to each other, the unit performs a first operation for developing printing data column by column on the memory, a second operation for assigning the printing data to each nozzle array, and a third operation for controlling the driving unit based on the assigned printing data, and, after the first operation and before the second operation, the unit specifies a portion of the printing data corresponding to a dot deviated from a correct printing region due to a tilt of the nozzle arrays and rearranges the portion.
    Type: Application
    Filed: December 2, 2014
    Publication date: June 11, 2015
    Inventors: Fumiko Suzuki, Osamu Iwasaki, Atsuhiko Masuyama, Satoshi Masuda
  • Patent number: 9016821
    Abstract: Adequate correction processing is performed on image data based on the degree of ink concentration that occurs even. An image processing apparatus having: acquisition unit for acquiring multi-value image data and a first parameter related to the degree of concentration of ink; first generation unit for generating corrected data by correcting the multi-value data that is to be printed for the first pixel based on the multi-value data that is to printed in the first pixel and a first parameter; and second generation unit for generating the first parameter and a second parameter that indicates the degree of ink concentration of the plurality of nozzles when printing a second pixel that is printed by the nozzles next to the first pixel.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: April 28, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Satoshi Masuda, Tomoki Yamamuro, Hitoshi Nishikori, Osamu Iwasaki, Norihiro Kawatoko, Atsuhiko Masuyama, Fumiko Suzuki, Nobuhiro Kitabatake, Mitsuhiro Ono
  • Patent number: 8979238
    Abstract: Provided are an inkjet printing apparatus and inkjet printing method that can, regardless of an ejection frequency of a print head, stabilize density of an image expressed on a print medium. For this purpose, an ink concentration integrated value is obtained according to the ejection history of each nozzle so as to be increased by data indicating non-ejection of the nozzle or decreased by data indicating ejection. Then, image data on the target pixel is corrected such that density of the target pixel is further reduced as the pixel is subjected to printing by a nozzle having a higher ink concentration integrated value.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: March 17, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hitoshi Nishikori, Satoshi Masuda, Tomoki Yamamuro, Osamu Iwasaki, Norihiro Kawatoko, Atsuhiko Masuyama, Fumiko Suzuki
  • Publication number: 20150070935
    Abstract: A large-sized thin light guide plate has a first layer on a light exit surface side and a second layer on a rear surface side containing scattering particles at a higher particle concentration than the first layer. Thicknesses of the layers in a direction substantially perpendicular to the light exit surface change to change a combined particle concentration. The scattering particles, obtained by mixing a particle group with an average particle size Ds of less than 7 ?m having one or more local maximum values and a particle group with an average particle size Db of more than 7 ?m having one or more local maximum values, satisfy 1 ?m?Ds<7 ?m, 7 ?m<Db?12 ?m and 0.3?a?0.5. High light use efficiency, reduction of luminance and color unevenness, a convex brightness distribution and easy manufacture can be achieved.
    Type: Application
    Filed: November 18, 2014
    Publication date: March 12, 2015
    Applicant: FUJIFILM CORPORATION
    Inventor: Osamu IWASAKI
  • Patent number: 8955956
    Abstract: In a printing apparatus improvement of drying ability and reduction of consumed power are concurrently achieved by improving the efficiency of drying ink. More concretely, hot air is blown onto a print medium printed by ink, and a portion of the blown hot air is recovered and blown again. Before the hot air is blown, the print medium is heated by a preheating unit, making it higher than the dew point temperature of the blown hot air.
    Type: Grant
    Filed: April 20, 2011
    Date of Patent: February 17, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kosuke Yamamoto, Tetsuya Saito, Norihiro Kawatoko, Osamu Iwasaki
  • Patent number: 8926160
    Abstract: The light guide plate has at least two layers which are superposed on each other in the direction almost perpendicular to the light exit surface and contain the scattering particles at different particle concentrations, the scattering particles are polydisperse particles including a mixture of particles with different particle sizes, and the combined particle concentrations in each portion of the light guide plate is different by changing the thicknesses of the first layer and the second layer in the direction almost perpendicular to the exit surface.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: January 6, 2015
    Assignee: FUJIFILM Corporation
    Inventor: Osamu Iwasaki
  • Publication number: 20140321891
    Abstract: The present invention relates to an image forming apparatus that forms an image by consecutively superposing toner images that have been formed on a plurality of photosensitive drums, on an intermediate transfer member or a transfer medium. The image forming apparatus is made compact and operates at a low cost. Since a current supply member supplies a current in a rotational direction of an intermediate transfer belt, multiple first transfer portions do not need corresponding voltage sources. Even in the case where a charging member supplies a current, the potential of the intermediate transfer belt is maintained at a predetermined potential by a constant-voltage element connected to support rollers.
    Type: Application
    Filed: December 9, 2011
    Publication date: October 30, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Kenji Karashima, Satoshi Tsuruya, Yoshikuni Ito, Yasuhiro Horiguchi, Takeshi Fujino, Takahiro Kawamoto, Takayuki Tanaka, Osamu Iwasaki, Kazunari Hagiwara
  • Patent number: RE45265
    Abstract: The purpose is to provide a high quality halftone recording with a reduced grainy feeling without lowering the true resolving power. Provided is an apparatus for making a halftone recording by employing three or more types of color materials, each of which has at least one grade of concentration, wherein each type of the color materials having the lowest concentration provides, when recording on a recording medium having a first lightness, a recorded region having its own lightness, and wherein a difference between the first lightness and the lightness of the recorded region is not more than 35, the lightness being measured according to the definition of CIE 1976 psychological measurement lightness using a standard illuminating light D65 as a light source.
    Type: Grant
    Filed: August 27, 2010
    Date of Patent: December 2, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kentaro Yano, Naoji Otsuka, Kiichiro Takahashi, Hitoshi Nishikori, Osamu Iwasaki, Daigoro Kanematsu, Hidehiko Kanda