Patents by Inventor Yasushi Sakuma

Yasushi Sakuma 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: 11283242
    Abstract: A semiconductor optical device may include a semiconductor substrate; a mesa stripe structure that extends in a stripe shape in a first direction on the semiconductor substrate and includes a contact layer on a top layer; an adjacent layer on the semiconductor substrate and adjacent to the mesa stripe structure in a second direction orthogonal to the first direction; a passivation film that covers at least a part of the adjacent layer; a resin layer on the passivation film; an electrode that is electrically connected to the contact layer and extends continuously from the contact layer to the resin layer; and an inorganic insulating film that extends continuously from the resin layer to the passivation film under the electrode, is spaced apart from the mesa stripe structure, and is completely interposed between the electrode and the resin layer.
    Type: Grant
    Filed: September 30, 2019
    Date of Patent: March 22, 2022
    Assignee: Lumentum Japan, Inc.
    Inventors: Shigetaka Hamada, Yasushi Sakuma, Kouji Nakahara
  • Publication number: 20220080888
    Abstract: An information presentation apparatus includes an out-of-vehicle risk detection section that is configured to detect an out-of-vehicle risk object, a gaze detection section that is configured to detect a gaze direction of a driver of the vehicle, a recognition determination section that is configured to determine whether the out-of-vehicle risk object is recognized by the driver based on a detection result by the out-of-vehicle risk detection section and a detection result by the gaze detection section, and an information presentation section that is configured to present, to the driver, out-of-vehicle risk information regarding the out-of-vehicle risk object in a presentation mode. The information presentation section is further configured to change the presentation mode depending on whether the out-of-vehicle risk object is recognized by the driver based on a determination result by the recognition determination section.
    Type: Application
    Filed: November 24, 2021
    Publication date: March 17, 2022
    Inventors: Akihiro HAYASHI, Kunihiko CHIBA, Takeshi HATOH, Yasushi SAKUMA, Iichirou TERAO
  • Publication number: 20220084458
    Abstract: A display control device, for a vehicle, controls a display of a virtual image by a head-up display. The display control device generates a guidance display object that guides a traveling route for the vehicle. The display control device recognizes a remaining distance from the vehicle to a guide point at which a route guidance by the guidance display object is generated.
    Type: Application
    Filed: November 23, 2021
    Publication date: March 17, 2022
    Inventors: Yasushi SAKUMA, Takeshi HATOH, Daisuke TAKEMORI, Kazuki KOJIMA
  • Patent number: 11220274
    Abstract: A vehicle display control device controls display performed by a head-up display for a vehicle. The head-up display is configured to project an image on a projection member to cause a virtual image to be displayed in superimposed relation on a front view of the vehicle. The vehicle display control device determines a host vehicle situation as a road structure of a road on which a host vehicle is running, and controls to limit or not to limit a superimposed display of the virtual image with respect to a target object on which the virtual image is to be displayed in superimposed relation according to the host vehicle situation determined.
    Type: Grant
    Filed: August 6, 2019
    Date of Patent: January 11, 2022
    Assignee: DENSO CORPORATION
    Inventors: Hiroto Banno, Takeshi Hato, Takeshi Kawashima, Daisuke Takemori, Akira Kamiya, Shingo Yamashita, Yasushi Sakuma, Satoshi Horihata
  • Publication number: 20220006257
    Abstract: The upper surface of the semiconductor substrate has a slope descending from the projection in the second direction at an angle of 0-12° to a horizontal plane. The mesa stripe structure has an inclined surface with a slope ascending from the upper surface of the semiconductor substrate at an angle of 45-55° to the horizontal plane, the mesa stripe structure having an upright surface rising from the inclined surface at an angle of 85-95° to the horizontal plane. The buried layer is made from semiconductor with ruthenium doped therein and is in contact with the inclined surface and the upright surface. The inclined surface is as high as 80% or less of height from the upper surface of the semiconductor substrate to a lower surface of the quantum well layer and is as high as 0.3 ?m or more.
    Type: Application
    Filed: September 17, 2021
    Publication date: January 6, 2022
    Inventors: Takafumi TANIGUCHI, Shigenori HAYAKAWA, Yasushi SAKUMA
  • Publication number: 20210408760
    Abstract: A semiconductor optical device may include a semiconductor substrate; a compound semiconductor layer on the semiconductor substrate; an additional insulating film on the pedestal portion of the compound semiconductor layer, the additional insulating film having an upper surface and a side surface at an inner obtuse angle between them; a passivation film covering the compound semiconductor layer and the additional insulating film except at least part of the mesa portion, the passivation film having a protrusion raised by overlapping with the additional insulating film; a mesa electrode on the at least part of the mesa portion; a pad electrode on the passivation film within the protrusion; and an extraction electrode on the passivation film, the extraction electrode being continuous within and outside the protrusion, the extraction electrode connecting the pad electrode and the mesa electrode, the extraction electrode being narrower in width than the pad electrode.
    Type: Application
    Filed: December 7, 2020
    Publication date: December 30, 2021
    Inventors: Ryosuke NAKAJIMA, Yasushi SAKUMA, Shigetaka HAMADA
  • Patent number: 11133646
    Abstract: The upper surface of the semiconductor substrate has a slope descending from the projection in the second direction at an angle of 0-12° to a horizontal plane. The mesa stripe structure has an inclined surface with a slope ascending from the upper surface of the semiconductor substrate at an angle of 45-55° to the horizontal plane, the mesa stripe structure having an upright surface rising from the inclined surface at an angle of 85-95° to the horizontal plane. The buried layer is made from semiconductor with ruthenium doped therein and is in contact with the inclined surface and the upright surface. The inclined surface is as high as 80% or less of height from the upper surface of the semiconductor substrate to a lower surface of the quantum well layer and is as high as 0.3 ?m or more.
    Type: Grant
    Filed: May 22, 2019
    Date of Patent: September 28, 2021
    Assignee: Lumentum Japan, Inc.
    Inventors: Takafumi Taniguchi, Shigenori Hayakawa, Yasushi Sakuma
  • Publication number: 20210234333
    Abstract: A semiconductor optical amplifier integrated laser includes a semiconductor laser oscillator portion that oscillates laser light having a wavelength included in a gain band and a semiconductor optical amplifier portion that amplifies laser light output from the semiconductor laser oscillator portion. The semiconductor laser oscillator portion and the semiconductor optical amplifier portion have one common p-i-n structure, the common p-i-n structure includes an active layer, a cladding layer provided apart from the active layer, and a common functional layer formed in the cladding layer, and the common functional layer includes a first portion that reflects light having a wavelength within the gain band in the semiconductor laser oscillator portion and a second portion that transmits light having a wavelength within the gain band in the semiconductor optical amplifier portion.
    Type: Application
    Filed: June 15, 2020
    Publication date: July 29, 2021
    Inventors: Atsushi NAKAMURA, Kaoru OKAMOTO, Masatoshi ARASAWA, Tetsuya NISHIDA, Yasushi SAKUMA, Shigetaka HAMADA, Ryosuke NAKAJIMA
  • Publication number: 20210104212
    Abstract: A display control device for a vehicle to control displaying a virtual image includes: a display image generator that generates a guide object display image for guiding a travel route; a distance recognition unit that recognizes a remaining distance from a current location of the vehicle to a guide target point; and a display controller that: displays a non-superimposed virtual image not to be superimposed on a specific superimposition target when the remaining distance is longer than a switch distance; and displays a superimposed virtual image to be superimposed on the specific superimposition target switched from the non-superimposed virtual image when the remaining distance becomes shorter than the switch distance.
    Type: Application
    Filed: November 23, 2020
    Publication date: April 8, 2021
    Inventors: Satoshi HORIHATA, Yasushi SAKUMA
  • Publication number: 20210078503
    Abstract: A display control device that controls a display state of a virtual image to be overlapped on an overlapping target in front of a passenger of the vehicle includes: a display image generator that generates a guide display object image formed by a combination of a plurality of image elements overlapped and displayed along a travel route to notify a passenger of the travel route of the vehicle; and an abandonment determination unit that determines whether each of the image elements is disposed out of a displayable range of the virtual image. When one of the image elements is disposed out of the displayable range, the display image generator displays a part of the image elements as the guide display object image, which is disposed along the travel route just before the one of the image elements that is determined to be out of the displayable range.
    Type: Application
    Filed: November 24, 2020
    Publication date: March 18, 2021
    Inventors: Satoshi HORIHATA, Yasushi SAKUMA
  • Publication number: 20210056934
    Abstract: A display control device for a vehicle to control a display of a virtual image to be superimposed on a superimposition target in a foreground of an occupant includes: a condition determination unit that determines whether a predetermined interruption condition is satisfied; and a display control unit that interrupts the display of the virtual image when the condition determination unit determines that the interruption condition is satisfied.
    Type: Application
    Filed: November 9, 2020
    Publication date: February 25, 2021
    Inventors: Satoshi HORIHATA, Yasushi SAKUMA
  • Publication number: 20210050713
    Abstract: A semiconductor optical device may include a semiconductor substrate; a mesa stripe structure that extends in a stripe shape in a first direction on the semiconductor substrate and includes a contact layer on a top layer; an adjacent layer on the semiconductor substrate and adjacent to the mesa stripe structure in a second direction orthogonal to the first direction; a passivation film that covers at least a part of the adjacent layer; a resin layer on the passivation film; an electrode that is electrically connected to the contact layer and extends continuously from the contact layer to the resin layer; and an inorganic insulating film that extends continuously from the resin layer to the passivation film under the electrode, is spaced apart from the mesa stripe structure, and is completely interposed between the electrode and the resin layer.
    Type: Application
    Filed: September 30, 2019
    Publication date: February 18, 2021
    Inventors: Shigetaka HAMADA, Yasushi SAKUMA, Kouji NAKAHARA
  • Publication number: 20200324759
    Abstract: A driving assistance apparatus includes: a traveling state detection unit of a vehicle; a rear condition detection unit that detects a status relating to a moving object behind the vehicle; a checking action detection unit that detects an action of a driver of the vehicle for checking behind the vehicle; a deceleration detection unit that detects deceleration of the vehicle; a notification unit that performs notification to the driver; and a control unit that controls the notification unit to perform the notification to the driver when the vehicle decelerates in a case where a condition that: the vehicle is in a traveling state; the moving object is disposed within the predetermined range behind the vehicle; and the driver has not checked behind the vehicle continues for a predetermined time.
    Type: Application
    Filed: April 27, 2017
    Publication date: October 15, 2020
    Applicants: DENSO CORPORATION, DENSO CORPORATION
    Inventor: Yasushi SAKUMA
  • Publication number: 20200044417
    Abstract: The upper surface of the semiconductor substrate has a slope descending from the projection in the second direction at an angle of 0-12° to a horizontal plane. The mesa stripe structure has an inclined surface with a slope ascending from the upper surface of the semiconductor substrate at an angle of 45-55° to the horizontal plane, the mesa stripe structure having an upright surface rising from the inclined surface at an angle of 85-95° to the horizontal plane. The buried layer is made from semiconductor with ruthenium doped therein and is in contact with the inclined surface and the upright surface. The inclined surface is as high as 80% or less of height from the upper surface of the semiconductor substrate to a lower surface of the quantum well layer and is as high as 0.3 ?m or more.
    Type: Application
    Filed: May 22, 2019
    Publication date: February 6, 2020
    Inventors: Takafumi TANIGUCHI, Shigenori HAYAKAWA, Yasushi SAKUMA
  • Publication number: 20190359228
    Abstract: A vehicle display control device controls display performed by a head-up display for a vehicle. The head-up display is configured to project an image on a projection member to cause a virtual image to be displayed in superimposed relation on a front view of the vehicle. The vehicle display control device determines a host vehicle situation as a road structure of a road on which a host vehicle is running, and controls to limit or not to limit a superimposed display of the virtual image with respect to a target object on which the virtual image is to be displayed in superimposed relation according to the host vehicle situation determined.
    Type: Application
    Filed: August 6, 2019
    Publication date: November 28, 2019
    Inventors: Hiroto BANNO, Takeshi HATO, Takeshi KAWASHIMA, Daisuke TAKEMORI, Akira KAMIYA, Shingo YAMASHITA, Yasushi SAKUMA, Satoshi HORIHATA
  • Patent number: 10434942
    Abstract: A driving assistance device includes a deceleration detection unit, an information calculation unit, and an index calculation unit. The information calculation unit obtains at least one type of front information including a time to collision until an own vehicle collides with a preceding vehicle, a time headway until the own vehicle reaches a position of the preceding vehicle, and a following distance between the own vehicle and the preceding vehicle when the own vehicle stops, after a deceleration start of the own vehicle. The index calculation unit obtains an index indicating a driving characteristic that is a characteristic of a driving operation of a driver, based on the front information.
    Type: Grant
    Filed: September 30, 2016
    Date of Patent: October 8, 2019
    Assignee: DENSO CORPORATION
    Inventors: Yasushi Sakuma, Hiroyuki Okuno
  • Patent number: 10230008
    Abstract: Provided are a semiconductor light receiving device, an optical receiver module, and a manufacturing method thereof in which characteristics of the device are improved when the device has a structure in which a mesa structure including layers formed of a common material is buried by a buried layer. The semiconductor light receiving device includes the mesa structure including the layers formed of a commonmaterial, the layers including an absorbing layer, the mesa structure being buried by the buried layer formed so as to surround side surfaces of the mesa structure. The mesa structure has a cross section having a forwardly tapered portion and a reversely tapered portion.
    Type: Grant
    Filed: February 12, 2016
    Date of Patent: March 12, 2019
    Assignee: Oclaro Japan, Inc.
    Inventors: Masahiro Ebisu, Hiroshi Hamada, Yasushi Sakuma, Shigenori Hayakawa
  • Publication number: 20180201188
    Abstract: A driving assistance device includes a deceleration detection unit, an information calculation unit, and an index calculation unit. The information calculation unit obtains at least one type of front information including a time to collision until an own vehicle collides with a preceding vehicle, a time headway until the own vehicle reaches a position of the preceding vehicle, and a following distance between the own vehicle and the preceding vehicle when the own vehicle stops, after a deceleration start of the own vehicle. The index calculation unit obtains an index indicating a driving characteristic that is a characteristic of a driving operation of a driver, based on the front information.
    Type: Application
    Filed: September 30, 2016
    Publication date: July 19, 2018
    Inventors: Yasushi SAKUMA, Hiroyuki OKUNO
  • Patent number: 9780530
    Abstract: Provided is a butt-jointed (BJ) semiconductor integrated optical device having a high manufacturing yield. A semiconductor integrated optical device, which is configured such that, on a semiconductor substrate, a first semiconductor optical element including an active layer and a second semiconductor optical element including a waveguide layer are butt-jointed to each other with their optical axes being aligned with each other, includes: a semiconductor regrowth layer including at least one of a diffraction grating layer or an etching stop layer, which is formed by one epitaxial growth across an entire surface above the active layer and the waveguide layer; and a cladding layer formed above the semiconductor regrowth layer.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: October 3, 2017
    Assignee: OCLARO JAPAN, INC.
    Inventors: Koichiro Adachi, Takanori Suzuki, Yasushi Sakuma, Kazuhiko Naoe, Akira Nakanishi
  • Publication number: 20160240698
    Abstract: Provided are a semiconductor light receiving device, an optical receiver module, and a manufacturing method thereof in which characteristics of the device are improved when the device has a structure in which a mesa structure including layers formed of a common material is buried by a buried layer. The semiconductor light receiving device includes the mesa structure including the layers formed of a commonmaterial, the layers including an absorbing layer, the mesa structure being buried by the buried layer formed so as to surround side surfaces of the mesa structure. The mesa structure has a cross section having a forwardly tapered portion and a reversely tapered portion.
    Type: Application
    Filed: February 12, 2016
    Publication date: August 18, 2016
    Inventors: Masahiro EBISU, Hiroshi HAMADA, Yasushi SAKUMA, Shigenori HAYAKAWA