Patents by Inventor Shigeaki Imai

Shigeaki Imai 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: 20220066177
    Abstract: An image projection apparatus includes: a light source; an image display element including multiple micromirrors arranged in two dimensions, the multiple micromirrors forming an image display plane, each micromirror having a reflecting surface; and a projection optical system. Conditional expressions (1) and (2) below are satisfied: ?1?14 (deg)??(1) 1.2<BF/L<2.2??(2) where ?1 is a maximum tilt angle of the reflecting surface of each micromirror with respect to the image display plane, L is a diagonal length of the image display plane, and BF is a distance between a vertex of a lens within the projection optical system and closest to the image display plane and the image display plane along an optical axis of the projection optical system.
    Type: Application
    Filed: August 31, 2021
    Publication date: March 3, 2022
    Inventors: Yohei TAKANO, Shigeaki IMAI, Kazuhiro FUJITA, Makoto HIRAKAWA
  • Patent number: 10795019
    Abstract: An object detector includes a light-emitting system and a light-receiving system. The light-emitting system includes a light source including a plurality of light-emitting elements disposed in one-axis direction. The light-emitting system emits light. The light-receiving system receives the light emitted from the light-emitting system and reflected by an object. The plurality of light-emitting elements emits a plurality of light beams to a plurality of areas differing in the one-axis direction. The amount of light to illuminate some of the plurality of areas is different from the amount of light to illuminate other area other than the some of the plurality of areas.
    Type: Grant
    Filed: June 26, 2017
    Date of Patent: October 6, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventor: Shigeaki Imai
  • Patent number: 10205844
    Abstract: A light beam scanning device scans a luminous flux irradiated from a light source and deflected by a deflector to a scanned surface through an optical system having a set of mirrors. A apparatus, such as the light beam scanning device, further includes a scanning line curve adjusting device to bend a first mirror of the set of mirrors so as to correct a curve in a scanning line on the scanned surface, and a scanning line tilt adjusting device to change orientation of a second mirror of the set of mirrors so as to correct a tilt in the scanning line on the scanned surface. The light beam scanning device may be provided in an image forming apparatus.
    Type: Grant
    Filed: December 17, 2012
    Date of Patent: February 12, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Shinsuke Miyake, Katsunori Shoji, Kazunori Watanabe, Shigeaki Imai
  • Patent number: 10148064
    Abstract: A semiconductor laser driving apparatus for driving a semiconductor laser serving as a light source for optical scanning, the semiconductor laser driving apparatus includes: first and second switching elements that are each capable of switching energization of the semiconductor laser ON/OFF; a first pulse generation unit that intermittently outputs first driving pulses to the first switching element in a first time slot; and a second pulse generation unit that outputs a second driving pulse to the second switching element in a second time slot different from the first time slot.
    Type: Grant
    Filed: March 2, 2016
    Date of Patent: December 4, 2018
    Assignee: RICOH COMPANY, LTD
    Inventors: Kohji Sakai, Masataka Uehira, Shigeaki Imai, Tadashi Nakamura
  • Patent number: 10114110
    Abstract: An object detecting device includes: a light source which includes a plurality of light emitting units arranged in a sub-scanning direction; a deflector which deflects light from the light source; and an optical detector which includes a plurality of light receiving units arranged in the sub-scanning direction so as to correspond to the plurality of light emitting units, and receives light deflected by the deflector and reflected by an object.
    Type: Grant
    Filed: March 14, 2016
    Date of Patent: October 30, 2018
    Assignee: RICOH COMPANY, LTD.
    Inventor: Shigeaki Imai
  • Patent number: 9989643
    Abstract: An object detection device includes: a light deflector that scans a scanning area with light emitted from a light source; and a light-receiving unit that, when an object is present in the scanning area, receives reflected light from the object through an imaging forming optical system. The light emitted from the light source irradiates an area having a shape longer in a second direction orthogonal to a first direction than in the first direction. Wpds/Wpdm<Wes/Wem is satisfied, where Wpdm is a length of the light-receiving region in the first direction, Wpds is a length of the light-receiving region in the second direction, Wem is a length of the area irradiated with the light emitted to the object, in the first direction, and Wes is a length of the area irradiated with the light emitted to the object, in the second direction.
    Type: Grant
    Filed: April 29, 2015
    Date of Patent: June 5, 2018
    Assignee: RICOH COMPANY, LTD.
    Inventor: Shigeaki Imai
  • Patent number: 9864164
    Abstract: An optical deflector includes a mirror rotatable around a rotating shaft of the optical deflector, the mirror including a base made of metal and a reflective surface, the reflective surface being parallel to an axial direction of the rotating shaft of the mirror. The mirror has a length that is twice a length from a center of the rotating shaft to the reflective surface, which is shorter than a length of the reflective surface in the direction of the rotating shaft.
    Type: Grant
    Filed: December 5, 2016
    Date of Patent: January 9, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Yukio Itami, Shigeaki Imai, Tadashi Nakamura
  • Publication number: 20180003821
    Abstract: An object detector includes a light-emitting system and a light-receiving system. The light-emitting system includes a light source including a plurality of light-emitting elements disposed in one-axis direction. The light-emitting system emits light. The light-receiving system receives the light emitted from the light-emitting system and reflected by an object. The plurality of light-emitting elements emits a plurality of light beams to a plurality of areas differing in the one-axis direction. The amount of light to illuminate some of the plurality of areas is different from the amount of light to illuminate other area other than the some of the plurality of areas.
    Type: Application
    Filed: June 26, 2017
    Publication date: January 4, 2018
    Inventor: Shigeaki IMAI
  • Patent number: 9846236
    Abstract: An optical scanner is provided including a light source configured to emit light, a light source driving device configured to drive the light source, a light deflector having at least one rotating reflection plane and configured to deflect the light emitted from the light source to a scanning area, and a light detector configured to output a signal to control a timing at which scanning of the scanning area by the light deflected by the light deflector starts, where the light detector and the scanning area are sequentially scanned in a single scanning by one reflection plane of the light deflector, and the light source driving device drives the light source using a first driving method when the light scans the light detector, and drives the light source using a second driving method that is different from the first driving method when the light scans the scanning area.
    Type: Grant
    Filed: July 30, 2015
    Date of Patent: December 19, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Shigeaki Imai, Masataka Uehira, Kohji Sakai, Tadashi Nakamura, Yukio Itami
  • Patent number: 9804385
    Abstract: An object detector and a sensing apparatus are provided. The object detector includes a light source, a light deflector configured to deflect light emitted from the light source, and a photodetector configured to detect the light that is deflected by the light deflector and then is reflected at an object, where the light deflector includes a plurality of reflection planes that rotate on a rotation axis, the reflection planes are oblique to the rotation axis and are rotationally symmetrical about the rotation axis, and the light that is emitted from the light source enters the light deflector in a direction parallel to the rotation axis. The sensing apparatus includes the object detector, and a monitoring controller configured to determine whether an object is present, and obtain movement information of the object including at least one of moving direction and moving speed of the object.
    Type: Grant
    Filed: April 29, 2015
    Date of Patent: October 31, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Yukio Itami, Shigeaki Imai, Tadashi Nakamura
  • Publication number: 20170168261
    Abstract: An optical deflector includes a mirror rotatable around a rotating shaft of the optical deflector, the mirror including a base made of metal and a reflective surface, the reflective surface being parallel to an axial direction of the rotating shaft of the mirror. The mirror has a length that is twice a length from a center of the rotating shaft to the reflective surface, which is shorter than a length of the reflective surface in the direction of the rotating shaft.
    Type: Application
    Filed: December 5, 2016
    Publication date: June 15, 2017
    Inventors: Yukio ITAMI, Shigeaki IMAI, Tadashi NAKAMURA
  • Patent number: 9568358
    Abstract: Disclosed is an optical measurement device including a first light source, an optical element that condenses a light beam emitted from the first light source, a light irradiator that irradiates the light beam onto an object; and a photo detector that detects reflected light or scattered light of the light beam from the object through an imaging system, the light beam being irradiated onto the object, wherein a first optical path length from the first light source to a first conjugate image of the first light source by the optical element is different from a second optical path length from the photo detector to a second conjugate image of the photo detector by the imaging system at least in a first direction.
    Type: Grant
    Filed: August 1, 2013
    Date of Patent: February 14, 2017
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tadashi Nakamura, Shigeaki Imai
  • Patent number: 9482982
    Abstract: An imaging system includes an incidence face having a plurality of optical faces formed along a first axis with a first pitch; a prism face having a plurality of grooves formed along the first axis with a second pitch; and an exit face having a plurality of optical faces formed along the first axis with a third pitch. A virtual plane extends from an end of the one optical face of the incidence face to an end of the one optical face of the exit face. Among light flux emitting from a spot light source and entering the one optical face of the incidence face, a light beam that passes over the virtual plane is reflected at the prism face, and passes over the virtual plane again and goes to the one optical face of the exit face.
    Type: Grant
    Filed: June 25, 2013
    Date of Patent: November 1, 2016
    Assignee: Ricoh Company, Ltd.
    Inventor: Shigeaki Imai
  • Publication number: 20160274223
    Abstract: An object detecting device includes: a light source which includes a plurality of light emitting units arranged in a sub-scanning direction; a deflector which deflects light from the light source; and an optical detector which includes a plurality of light receiving units arranged in the sub-scanning direction so as to correspond to the plurality of light emitting units, and receives light deflected by the deflector and reflected by an object.
    Type: Application
    Filed: March 14, 2016
    Publication date: September 22, 2016
    Inventor: Shigeaki IMAI
  • Publication number: 20160261090
    Abstract: A semiconductor laser driving apparatus for driving a semiconductor laser serving as a light source for optical scanning, the semiconductor laser driving apparatus includes: first and second switching elements that are each capable of switching energization of the semiconductor laser ON/OFF; a first pulse generation unit that intermittently outputs first driving pulses to the first switching element in a first time slot; and a second pulse generation unit that outputs a second driving pulse to the second switching element in a second time slot different from the first time slot.
    Type: Application
    Filed: March 2, 2016
    Publication date: September 8, 2016
    Inventors: Kohji Sakai, Masataka Uehira, Shigeaki Imai, Tadashi Nakamura
  • Patent number: 9304228
    Abstract: An object detection apparatus includes an incident optical system, which includes light source units and a combining unit combining light beams emitted from the light source units; a deflection unit including rotating reflection parts that deflect the light beams to scan and be irradiated on a predetermined range of an object; an imaging unit forming an image based on the light from the predetermined range of the object; and an optical detection unit detecting the object based on the light received via the imaging unit. Further the combining unit combines the light beams such that each of the combined light beams passes a single light path when projected onto a predetermined plane, and each of the light paths exists outside a region of the deflection unit when projected onto the first plane.
    Type: Grant
    Filed: July 31, 2013
    Date of Patent: April 5, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tadashi Nakamura, Shigeaki Imai, Shuichi Suzuki, Mitsuru Nakajima, Kenichi Yoshimura, Hiroyoshi Funato
  • Patent number: 9283771
    Abstract: A method of manufacturing a print head includes a first step of finding first light quantity related data showing a light quantity in a light spot formed by lighting up each of light-emitting units by a driving unit by using a first threshold, a second step of finding first magnitude related data showing a magnitude in the light spot formed by lighting up the light-emitting unit by the driving unit by using a second threshold, a third step of finding first ratio data showing a ratio between the first light quantity related data and the first magnitude related data, a fourth step of finding light quantity correction data to the light-emitting unit forming the light spot as a target by using the first ratio data, and a fifth step of retaining the found light quantity correction data to the print head.
    Type: Grant
    Filed: January 16, 2015
    Date of Patent: March 15, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventor: Shigeaki Imai
  • Patent number: 9285266
    Abstract: An object detector includes a light source; an optical system that converts a light beam emitted from the light source into a predetermined state; a deflector that deflects and scans the light beam passing through the optical system, and that irradiates the light beam onto an object; and a photo detector that detects reflected light or scattered light. A first size of a light emitting region of the light source is different from a second size of the light emitting region, wherein the first size is a first width of the light emitting region in a first direction, and the second size is a second width of the light emitting region in a second direction. One of the first direction and the second direction corresponding to a smaller one of the first size and the second size coincides with a direction in which angular resolution is higher.
    Type: Grant
    Filed: January 10, 2014
    Date of Patent: March 15, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tadashi Nakamura, Shigeaki Imai
  • Publication number: 20160061955
    Abstract: An optical scanner is provided including a light source configured to emit light, a light source driving device configured to drive the light source, a light deflector having at least one rotating reflection plane and configured to deflect the light emitted from the light source to a scanning area, and a light detector configured to output a signal to control a timing at which scanning of the scanning area by the light deflected by the light deflector starts, where the light detector and the scanning area are sequentially scanned in a single scanning by one reflection plane of the light deflector, and the light source driving device drives the light source using a first driving method when the light scans the light detector, and drives the light source using a second driving method that is different from the first driving method when the light scans the scanning area.
    Type: Application
    Filed: July 30, 2015
    Publication date: March 3, 2016
    Inventors: Shigeaki Imai, Masataka Uehira, Kohji Sakai, Tadashi Nakamura, Yukio Itami
  • Publication number: 20150331108
    Abstract: An object detector and a sensing apparatus are provided. The object detector includes a light source, a light deflector configured to deflect light emitted from the light source, and a photodetector configured to detect the light that is deflected by the light deflector and then is reflected at an object, where the light deflector includes a plurality of reflection planes that rotate on a rotation axis, the reflection planes are oblique to the rotation axis and are rotationally symmetrical about the rotation axis, and the light that is emitted from the light source enters the light deflector in a direction parallel to the rotation axis. The sensing apparatus includes the object detector, and a monitoring controller configured to determine whether an object is present, and obtain movement information of the object including at least one of moving direction and moving speed of the object.
    Type: Application
    Filed: April 29, 2015
    Publication date: November 19, 2015
    Inventors: Yukio ITAMI, Shigeaki IMAI, Tadashi NAKAMURA