Patents by Inventor Takuma Ishikawa

Takuma Ishikawa 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: 20210105387
    Abstract: An imaging device, having a substrate for mounting an imaging portion; a lens barrel for holding a lens group; a shield plate covering the vicinity of the substrate; and a case disposed so as to cover the lens barrel, the substrate, and the shield plate, wherein: the shield plate is structured having a contacting portion that contacts another member so as to constrain movement in the optical axial direction, and a biasing portion that contacts the coupling so as to receive a biasing force in the optical axial direction.
    Type: Application
    Filed: March 26, 2018
    Publication date: April 8, 2021
    Applicant: NIDEC COPAL CORPORATION
    Inventors: Yuta NAKAMURA, Takuma ISHIKAWA
  • Publication number: 20200411715
    Abstract: A light-emitting thyristor includes a first semiconductor layer of a P type, a second semiconductor layer of an N type arranged adjacent to the first semiconductor layer; a third semiconductor layer of the P type arranged adjacent to the second semiconductor layer; and a fourth semiconductor layer of the N type arranged adjacent to the third semiconductor layer. A part of the first semiconductor layer is an active layer adjacent to the second semiconductor layer. A dopant concentration of the active layer is higher than or equal to a dopant concentration of the third semiconductor layer. A thickness of the third semiconductor layer is thinner than a thickness of the second semiconductor layer. A dopant concentration of the second semiconductor layer is lower than the dopant concentration of the third semiconductor layer.
    Type: Application
    Filed: June 18, 2020
    Publication date: December 31, 2020
    Applicant: Oki Data Corporation
    Inventors: Hiroto KAWADA, Kenichi TANIGAWA, Shinya JYUMONJI, Takuma ISHIKAWA, Chihiro TAKAHASHI
  • Publication number: 20200386794
    Abstract: The current sensor has a conductive member through which a current to be measured flows in a predetermined direction, and a magneto electric converter facing and spaced apart from the conductive member in an intersecting direction intersecting the predetermined direction. An opposing portion of the conductive member facing the magneto electric converter has an annular shape in which two tip surfaces face each other via a gap around the predetermined direction. The magneto electric converter is opposed to the hollow portion, arranged in the opposing portion having an annular shape, in the intersecting direction via the gap.
    Type: Application
    Filed: August 25, 2020
    Publication date: December 10, 2020
    Inventors: Tatsuaki SUGITO, Takeshi TSUKAMOTO, Takuma ESAKA, Ryosuke SAKAI, Akito SASAKI, Hatsuomi ISOGAI, Hiroaki MIWA, Hiroshi NOMURA, Takashi ISHIKAWA, Katsunori MICHIYAMA
  • Publication number: 20200212260
    Abstract: A light-emitting thyristor includes a first semiconductor layer of a first conductivity type; a second semiconductor layer of a second conductivity type arranged adjacent to the first semiconductor layer; a third semiconductor layer of the first conductivity type arranged adjacent to the second semiconductor layer; and a fourth semiconductor layer of the second conductivity type arranged adjacent to the third semiconductor layer. The first semiconductor layer includes an active layer adjacent to the second semiconductor layer, the second semiconductor layer includes a first layer adjacent to the active layer and a second layer arranged between the first layer and the third semiconductor layer, and the first layer has a band gap wider than a band gap of the active layer and a band gap of the second layer.
    Type: Application
    Filed: October 15, 2019
    Publication date: July 2, 2020
    Inventors: Hiroto KAWADA, Kenichi TANIGAWA, Shinya JYUMONJI, Takuma ISHIKAWA, Chihiro TAKAHASHI
  • Patent number: 10491776
    Abstract: An exposure device includes a plate member, a plurality of light-emitting elements, and an optical system. The plate member extends in both a first direction and a second direction intersecting with the first direction. The light-emitting elements are disposed on the plate member side by side in the first direction. The light-emitting elements emit respective light beams in the second direction. The optical system is disposed on the plate member and faces the light-emitting elements in the second direction. The optical system performs imaging of the light beams emitted by the respective light-emitting elements.
    Type: Grant
    Filed: July 18, 2017
    Date of Patent: November 26, 2019
    Assignee: Oki Data Corporation
    Inventor: Takuma Ishikawa
  • Publication number: 20180034999
    Abstract: An exposure device includes a plate member, a plurality of light-emitting elements, and an optical system. The plate member extends in both a first direction and a second direction intersecting with the first direction. The light-emitting elements are disposed on the plate member side by side in the first direction. The light-emitting elements emit respective light beams in the second direction. The optical system is disposed on the plate member and faces the light-emitting elements in the second direction. The optical system performs imaging of the light beams emitted by the respective light-emitting elements.
    Type: Application
    Filed: July 18, 2017
    Publication date: February 1, 2018
    Inventor: Takuma ISHIKAWA
  • Patent number: 9663652
    Abstract: Provided is a polybutylene terephthalate resin composition having excellent mold releasability, measurement stability and hydrolysis resistance, and exhibiting minimal discoloration under high-temperature conditions. The polybutylene terephthalate resin composition contains: (A) a polybutylene terephthalate resin, (B) a higher fatty acid ester of pentaerythritol, and (C) a low-molecular weight polyethylene having a number-average molecular weight of 3,000 to 7,000. It is preferable that the component (B) is pentaerythritol tetrastearate, and that the component (C) is a low-molecular weight polyethylene having a number-average molecular weight of 4,500 to 5,500.
    Type: Grant
    Filed: January 27, 2015
    Date of Patent: May 30, 2017
    Assignee: WinTech Polymer Ltd.
    Inventors: Takuma Ishikawa, Takayuki Ishikawa, Kazuya Goshima
  • Publication number: 20170002194
    Abstract: Provided is a polybutylene terephthalate resin composition having excellent mold releasability, measurement stability and hydrolysis resistance, and exhibiting minimal discoloration under high-temperature conditions. The polybutylene terephthalate resin composition contains: (A) a polybutylene terephthalate resin, (B) a higher fatty acid ester of pentaerythritol, and (C) a low-molecular weight polyethylene having a number-average molecular weight of 3,000 to 7,000. It is preferable that the component (B) is pentaerythritol tetrastearate, and that the component (C) is a low-molecular weight polyethylene having a number-average molecular weight of 4,500 to 5,500.
    Type: Application
    Filed: January 27, 2015
    Publication date: January 5, 2017
    Applicant: WinTech Polymer Ltd.
    Inventors: Takuma Ishikawa, Takayuki Ishikawa, Kazuya Goshima
  • Publication number: 20140002912
    Abstract: The present invention provides a lens drive device including a base, a lens frame holding a lens and provided to be movable with respect to the base in an optical axis direction of the lens, a light bending portion for bending incident light on the lens, a driving unit for moving the lens frame, and a position detection unit for detecting a position of the lens frame. The position detection unit includes a reflection portion provided to one of the base and the lens frame and including a reflection surface inclined with respect to the optical axis of the lens, and a photoreflector provided to the other of the base and the lens frame and including a light projecting portion applying light to the reflection surface and a light receiving portion receiving light reflected on the reflection surface.
    Type: Application
    Filed: January 31, 2012
    Publication date: January 2, 2014
    Inventors: Takuma Ishikawa, Hiroki Ito, Yohsuke Ikeda, Takafumi Ishikawa, Hiroyuki Watanabe
  • Publication number: 20130314809
    Abstract: The present invention provides a lens drive device including a base member arranged inside a lens barrel, a lens frame holding a lens and provided to be movable with respect to the base member in an optical axis direction of the lens, a voice coil motor for moving the lens frame, and a position detection unit for detecting a position of the lens frame. The position detection unit includes a reflection portion provided to one of the base and the lens frame and including a reflection surface inclined with respect to the optical axis of the lens, and a photoreflector provided to the other of the base member and the lens frame and including a light projecting portion applying light to the reflection surface and a light receiving portion receiving light reflected on a reflection flat surface.
    Type: Application
    Filed: January 30, 2012
    Publication date: November 28, 2013
    Inventors: Hiroyuki Watanabe, Yohsuke Ikeda, Takafumi Ishikawa, Takuma Ishikawa, Hiroki Ito
  • Patent number: 6126163
    Abstract: A sheet aligning apparatus for a copying machine having a loading unit capable of loading a plurality of stacked sheets. A comparing unit determines and compares respective sizes of at least two sheets partially stacked and loaded on the loading unit. An alignment unit carries out alignment when the width of a sheet of a first job is the same or smaller than a sheet of a second job and inhibits carrying out alignment when the width of a sheet of the first job is greater than a sheet of the second job. The apparatus further includes first and second discharge units for discharging a group of sheets from respective first and second jobs onto the load unit. A determination unit determines successiveness of the first and second jobs and, based on a result of the determination, a post-processing unit executes post-processing for the group of sheets of the first job upon completion of discharging the group of sheets of the second job.
    Type: Grant
    Filed: August 18, 1998
    Date of Patent: October 3, 2000
    Assignee: Minolta Co., Ltd.
    Inventors: Kunihiko Katsuta, deceased, by Shikou Komaki, legal representative, Takuma Ishikawa, Masayoshi Horikawa, Syuichi Katohgi
  • Patent number: 5809372
    Abstract: A processing apparatus is utilized for a copying machine capable of executing successively a first job and then a second job. An user inputs the number of originals, the number of copies to be made, or the like using a picture plane for setting the first job. Based on information about the input numbers of originals and copies, and information about a copying operation that can be carried out by the copying machine, the number of originals and the number of copies that can be set for the second job are determined. The determined numbers of originals and copies are displayed. Accordingly, the number of originals and the number of copies which exceed a limitation of processing by the copying machine would not be input, thereby improving handling of the apparatus.
    Type: Grant
    Filed: April 16, 1997
    Date of Patent: September 15, 1998
    Assignee: Minolta Co., Ltd.
    Inventors: Kunihiko Katsuta, Takuma Ishikawa, Masayoshi Horikawa, Syuichi Katohgi, Koji Higashikawa, Satoshi Fujii
  • Patent number: 5470051
    Abstract: An automatic document feeder for conveying a document on a platen glass. Back-up rollers for pressing a conveyer belt against the platen glass are loosely supported by a body frame. The shafts of a driving roller and a driven roller for rotating the conveyer belt, and the supporting member of the back-up rollers each have an end which is detachable from the body frame. The body frame has a first frame pivoted on a copying machine and a second frame for holding the conveyer belt and its motor. The second frame is connected with the first frame such that the second frame is movable from and to the platen glass with a specified range, and further the second frame is urged in a direction separating from the platen glass. The second frame is also movable in a direction perpendicular to a direction in which the pivot of the first frame extends.
    Type: Grant
    Filed: December 3, 1993
    Date of Patent: November 28, 1995
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Yuusuke Morigami, Hirokazu Matsuo, Hirofumi Tanahashi, Yoshihito Hirano, Hiroyasu Nagato, Takuma Ishikawa
  • Patent number: 5347352
    Abstract: Copying apparatus capable of high speed document exchange and high speed copying. Sets an original at the exposure position and prefeeds at least two originals to their respective standby positions. Pre-fed originals are detected by various sensors. Prefeeds copy paper for the respective originals based on the aforesaid detection results. Copying efficiency is improved by prefeeding originals and prefeeding copy paper.
    Type: Grant
    Filed: September 28, 1992
    Date of Patent: September 13, 1994
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Yuusuk Morigami, Akira Ohhata, Wataru Hamakawa, Hirokazu Matsuo, Hiroyasu Nagato, Takuma Ishikawa
  • Patent number: 5327206
    Abstract: An image forming apparatus having a refeeding unit for temporarily containing image-formed sheets as a horizontal pile and for refeeding the sheets for the second image forming operation. The refeeding unit can be pulled out from a body frame in the direction perpendicular to a sheet transporting direction. A setting position of the refeeding unit in the body frame can be adjusted to be parallel with the sheet transporting direction. The refeeding unit has an intermediate tray on which the sheets are piled, a refeeding roller which feeds the sheets piled on the intermediate tray from the most bottom sheet successively one by one, a sheet front end aligning member, a sheet rear end aligning member, a sheet side aligning member and a sheet pressing plate which, every time a sheet is transported to the intermediate tray and every time a sheet is refed from the intermediate tray, presses the sheet toward the refeeding roller.
    Type: Grant
    Filed: July 14, 1992
    Date of Patent: July 5, 1994
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Masahide Ueda, Takashi Onishi, Takuma Ishikawa, Hirofumi Tanahashi
  • Patent number: 5292113
    Abstract: An automatic document feeder for conveying a document on a platen glass. Back-up rollers for pressing a conveyer belt against the platen glass are loosely supported by a body frame. The shafts of a driving roller and a driven roller for rotating the conveyer belt, and the supporting member of the back-up rollers each have an end which is detachable from the body frame. The body frame has a first frame pivoted on a copying machine and a second frame for holding the conveyer belt and its motor. The second frame is connected with the first frame such that the second frame is movable from and to the platen glass with a specified range, and further the second frame is urged in a direction separating from the platen glass. The second frame is also movable in a direction perpendicular to a direction in which the pivot of the first frame extends.
    Type: Grant
    Filed: September 28, 1992
    Date of Patent: March 8, 1994
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Yuusuke Morigami, Hirokazu Matsuo, Hirofumi Tanahashi, Yoshihito Hirano, Hiroyasu Nagato, Takuma Ishikawa
  • Patent number: 5213322
    Abstract: In an original transfer apparatus, a pair of rollers around which a transfer belt is stretched and pressing rollers provided between the pair of rollers and adapted to press the transfer belt against the platen are held with each end portion of each shaft of the rollers being fixed to a frame of a body of the transfer apparatus so as to be attachable and detachable directly and separately. The fitting of these rollers is executed by fitting at least three end portions of the shafts of the pair of rollers and each end portion of each shaft of the pressing rollers to the frame from a side opposed to the platen of the frame of the body.
    Type: Grant
    Filed: November 6, 1991
    Date of Patent: May 25, 1993
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Hirokazu Matsuo, Yuusuke Morigami, Takuma Ishikawa
  • Patent number: 5141215
    Abstract: A sorter-finisher wherein sheets discharged from an image forming apparatus are distributed among a plurality of bins in a sorter unit, and thereafter the sheets are taken out of each bin and transported to a finisher unit to be finished. The bins are put one upon another, and they are movable up and down. A take-out unit for taking sheets out of each bin in order to transport the sheets to the finisher unit is installed above the bins positioned for the distributing operation. Each bin is moved up to the position facing the take-out unit and further is laterally moved toward the take-out unit, and the sheets in the bin are taken out thereof nipped by a pair of rollers. Further, the sorter-finisher comprises a transporting unit which is a route from the discharge portion of the image forming apparatus to a receiving/take-out portion of the sorter unit, and sheets are transported to the bins and also transported to the finisher unit through the transporting unit.
    Type: Grant
    Filed: August 16, 1989
    Date of Patent: August 25, 1992
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Kuniaki Ishiguro, Takuma Ishikawa, Toshio Matsui
  • Patent number: 5133539
    Abstract: A sorter-finisher wherein sheets discharged from an image forming apparatus are distributed among a plurality of bins in a sorter unit, and thereafter the sheets are taken out of each bin and transported to a finisher unit to be finished. The bins are put one upon another, and they are movable up and down. A take-out unit for taking sheets out of each bin in order to transport the sheets to the finisher unit is installed above the bins positioned for the distributing operation. Each bin is moved up to the position facing the take-out unit and further is laterally moved toward the take-out unit, and the sheets in the bin are taken out thereof nipped by a pair of rollers. Further, the sorter-finisher comprises a transporting unit which is a route from the discharge portion of the image forming apparatus to a receiving/take-out portion of the sorter unit, and sheets are transported to the bins and also transported to the finisher unit through the transporting unit.
    Type: Grant
    Filed: March 7, 1991
    Date of Patent: July 28, 1992
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Kuniaki Ishiguro, Takuma Ishikawa, Toshio Matsui
  • Patent number: RE34460
    Abstract: In a copying apparatus having a sorter with a sheet stapling function; the sorter has a plurality of bins capable of independently moving up or down, wherein sheets are sorted into the bins sequentially from the top bin to the bottom bin; the bins are moved down to a position where sheets are taken by take-out rollers for transporting them to a stapling unit after the sorting operation; and the bins other than those assigned for the number of copy sets are moved down to the take-out position during the sorting operation. Further, a copying apparatus has a controller which inhibits a copying machine from starting to operate when both a non-sorting mode and a stapling mode are selected at a time and when the input number of copy sets is .[.more than.]. 2 .Iadd.or more.Iaddend., and may cancel the stapling mode during the sorting operation in the stapling mode and continue the sorting operation even after canceling the stapling mode.
    Type: Grant
    Filed: February 14, 1992
    Date of Patent: November 30, 1993
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Kuniaki Ishiguro, Takuma Ishikawa