Patents Assigned to Hitachi-LG Data Storage, Inc.
  • Patent number: 11867810
    Abstract: There is provided a distance measurement system in which a plurality of distance measurement sensors are installed to detect an object in a measurement area, the system including: a detection intensity distribution display device that performs quantification according to light intensities of light which reaches the object after being emitted from the distance measurement sensors, or point cloud numbers, and displays colors or lights and shades according to magnitudes of numerical values to perform visualization and a display. The detection intensity distribution display device regards a space in front of the distance measurement sensors as one cube, divides the cube into a plurality of small cubes (voxels), and quantifies a detection intensity according to the light intensity of the light that reaches each of the voxels after being emitted from the distance measurement sensors, or the point cloud number of each of the voxels.
    Type: Grant
    Filed: June 14, 2021
    Date of Patent: January 9, 2024
    Assignee: HITACHI-LG DATA STORAGE, INC.
    Inventors: Kenji Akahoshi, Norimoto Ichikawa
  • Patent number: 11789122
    Abstract: The present invention provides an omnidirectional distance measuring device that covers a wide detection range and does not require adjustment of each of the detection areas of a plurality of distance measuring sensors. In the omnidirectional distance measuring device, a plurality of distance measuring sensors that measure a distance to a target are disposed radially around a central axis so as to be close to each other. The plurality of distance measuring sensors are integrally configured such that a detection center direction of each of the plurality of distance measuring sensors is inclined by a predetermined angle from a plane perpendicular to the central axis. As the distance measuring sensor, a TOF sensor that measures a distance based on a flight time of light or a stereo camera that measures a distance using parallax of a pair of cameras is used.
    Type: Grant
    Filed: October 21, 2020
    Date of Patent: October 17, 2023
    Assignee: HITACHI-LG DATA STORAGE, INC.
    Inventors: Naoya Matsuura, Norimoto Ichikawa
  • Patent number: 11782155
    Abstract: A distance measurement device includes a light emitting unit; a light receiving unit; a distance calculation unit that calculates a distance to an object; and a controller that controls the light emitting unit and the light receiving unit to determine whether or not there is interference from another distance measurement device, from a distance calculation result from the distance calculation unit. The controller includes a light emission and exposure period-setting unit that sets a light emission and exposure period of the light emitting unit and the light receiving unit, a distance variation measurement unit that measures a variation of distance values repeatedly obtained in a predetermined duration by the distance calculation unit, and an interference determination unit that compares a distance variation value to a threshold value which is determined in advance, to determine whether or not there is interference.
    Type: Grant
    Filed: August 26, 2020
    Date of Patent: October 10, 2023
    Assignee: HITACHI-LG DATA STORAGE, INC.
    Inventor: Takeshi Imai
  • Patent number: 11726331
    Abstract: A head mounted display displays an image in a user's view field and includes a projection unit projecting image light from an image display unit; and a first and second light guide plates that duplicate the image light from the projection unit. The first and second light guide plates each include a set of parallel main surfaces confining the image light by internal reflection. The first light guide plate includes an incident surface reflecting the image light inward, and two or more emission reflective surfaces emitting the image light to the second light guide plate. The incident and emission reflective surfaces are parallel to each other at an angle different from the main surface, and the second light guide plate includes an input unit coupling the image light from the first light guide plate inward, and an output unit emitting the image light to the user's pupil.
    Type: Grant
    Filed: May 25, 2021
    Date of Patent: August 15, 2023
    Assignee: HITACHI-LG DATA STORAGE, INC.
    Inventors: Toshiteru Nakamura, Takuma Kuno, Takahiro Mouri
  • Publication number: 20230137706
    Abstract: An objective of the present disclosure is to easily and precisely correct a distance error caused by multipath phenomenon in a distance measuring apparatus using TOF method. A distance measuring apparatus according to the present disclosure identifies an equation of plane that approximates a plane in a space where a target object exists, compares the equation of plane with a measured distance of the place, thereby calculating a correcting value for correcting a measured distance.
    Type: Application
    Filed: September 13, 2022
    Publication date: May 4, 2023
    Applicant: Hitachi-LG Data Storage, Inc.
    Inventor: Koichi Sakita
  • Patent number: 11604278
    Abstract: A three-dimensional distance measurement device includes a light emitting unit that irradiates a subject with light; a light receiving unit that detects reflected light from the subject; a distance calculation unit that calculates a three-dimensional distance to the subject on the basis of a transmission time of the detected reflected light; an image processing unit that generates a distance image of the subject on the basis of the calculated distance data; and a distance mode selection processing unit that selects a predetermined distance mode from a plurality of distance modes having different measurable distance ranges and sets a driving condition of the light emitting unit. By selecting a first distance mode in a first frame and selecting a second distance mode in a second frame, and by combining the distance data acquired in the respective frames, three-dimensional distance data of a frame to be output is generated.
    Type: Grant
    Filed: April 27, 2020
    Date of Patent: March 14, 2023
    Assignee: HITACHI-LG DATA STORAGE, INC.
    Inventor: Katsuhiko Izumi
  • Patent number: 11585936
    Abstract: In a range imaging camera, a first range image producing unit produces a first range image by calculating a distance to an object on the basis of the delay time or the received light amount of each pixel produced by a light receiving processing unit. A second range image producing unit produces a second range image by performing filtering for each pixel of the first range image using a group of neighboring pixels including its own pixel. In this case, a pixel group selection unit selects a group of pixels used in the filtering such that at least one of produced values including the delay time and the received light amount produced by the light receiving processing unit and the first range image produced by the first range image producing unit is equal to or larger than a noise component value.
    Type: Grant
    Filed: May 13, 2019
    Date of Patent: February 21, 2023
    Assignee: HITACHI-LG DATA STORAGE, INC.
    Inventor: Toshio Kamimura
  • Patent number: 11561393
    Abstract: To improve brightness of an image to be perceived by a user and enhance visibility there is provided a light guide plate including an incident diffraction grating which diffracts incident imaging light, an exit diffraction grating through which the imaging light goes out, and an intermediate diffraction grating existing in optical paths from the incident diffraction grating to the exit diffraction grating. In this light guide plate, a periodic linear corrugated pattern is formed as the incident diffraction grating, and when an imaginary line is established that passes through an incident point of imaging light onto the incident diffraction grating and is parallel with a periodic direction of the corrugated pattern, the intermediate diffraction grating has a first region on one side of the imaginary line and a second region on another side of the imaginary line.
    Type: Grant
    Filed: September 19, 2019
    Date of Patent: January 24, 2023
    Assignee: HITACHI-LG DATA STORAGE, INC.
    Inventors: Hiroyuki Minemura, Yumiko Anzai
  • Patent number: 11555983
    Abstract: There is provided a light source module in which an optical element is accommodated in a housing, in which three projection portions are provided in the housing, and the light source module has a structure where the optical element is pressed to be brought into contact with the three projection portions by a pressing member, so that the optical element is fixed in the housing.
    Type: Grant
    Filed: October 23, 2020
    Date of Patent: January 17, 2023
    Assignee: HITACHI-LG DATA STORAGE, INC.
    Inventors: Masashi Yamashita, Fumihito Ichikawa, Kazuhiro Aoyama
  • Patent number: 11543648
    Abstract: There is provided a highly efficient virtual image projection device in a small size that displays images of high luminance in which an illumination system is reduced in size with no degradation in an effective luminous light beam. A virtual image projection device that shows video to a human eye includes a virtual light source surface (116) that emits a light beam in a predetermined angular distribution, an image forming lens (117) that condenses the light beam from the virtual light source surface (116), and a display (120) that creates video. When the virtual light source surface (116) is disposed at a nearly focal position on the front side of the image forming lens (117), the display (120) is disposed at a nearly focal position on the rear side of the image forming lens.
    Type: Grant
    Filed: October 30, 2018
    Date of Patent: January 3, 2023
    Assignee: HITACHI-LG DATA STORAGE, INC.
    Inventors: Seiji Murata, Ryuji Ukai, Tomoto Kawamura, Toshiteru Nakamura
  • Patent number: 11531102
    Abstract: A distance measurement image pickup apparatus has two measurement periods. In a first distance measurement period, short pulsed light (1T) is irradiated, and exposure is performed in a plurality of exposure periods (A, B, and C) in which exposure timings are shifted. In each exposure period, an exposure gate is opened a plurality of times to perform repetitive exposure, and a first non-exposure period is provided from when a last exposure gate is closed until subsequent pulsed light is irradiated. In a second distance measurement period, long pulsed light (4T) is irradiated, and exposure is performed in a plurality of exposure periods (A, B, and C) in which exposure timings are shifted. In each exposure period, exposure is performed by opening the exposure gate only once, and a second non-exposure period is provided from when a last exposure gate is closed until subsequent pulsed light is irradiated.
    Type: Grant
    Filed: August 27, 2019
    Date of Patent: December 20, 2022
    Assignee: HITACHI-LG DATA STORAGE, INC.
    Inventors: Toshimasa Kamisada, Kozo Masuda, Hisataka Sugiyama, Toshimichi Shintani
  • Patent number: 11530912
    Abstract: A distance measurement device includes a light-emitting-unit that emits irradiation light toward an object; a light-receiving unit that receives reflected light from the object; a distance-calculation unit that calculates a distance to the object based on a transmission time of the reflected light received; a posture-adjustment mechanism that adjusts a posture of at least the light-receiving-unit; and a posture-controller that drives the posture-adjustment mechanism. The light-receiving unit is formed of a two-dimensional sensor in which a plurality of pixels are two-dimensionally arrayed, and the distance-calculation unit calculates two-dimensional distance data from received light data in each of the pixels of the two-dimensional sensor.
    Type: Grant
    Filed: November 30, 2020
    Date of Patent: December 20, 2022
    Assignee: HITACHI-LG DATA STORAGE, INC.
    Inventors: Hiroshi Ogasawara, Toshimichi Shintani, Takahiro Komaki, Hisataka Sugiyama
  • Patent number: 11513473
    Abstract: Provided is a waveguide having a light diffraction unit that diffracts incident light by a multiplex-recorded hologram, in which, in the light diffraction unit, a plurality of holograms having different angles with respect to an incident surface of the waveguide are formed, and when certain parallel light beams are incident, different wavelengths are diffracted by the plurality of holograms.
    Type: Grant
    Filed: May 14, 2020
    Date of Patent: November 29, 2022
    Assignee: HITACHI-LG DATA STORAGE, INC.
    Inventors: Takeru Utsugi, Hiromichi Yamakawa
  • Patent number: 11493759
    Abstract: It is an objective of this disclosure to protect a highly transparent hologram light guide plate from water vapor and ultraviolet ray, thereby suppressing deterioration of the hologram light guide plate even when employed in a head mount display used in outdoor environments. A hologram light guide plate according to this disclosure comprises a protection layer that protects a hologram layer and an intermediate layer that is placed between a glass layer and the protection layer, wherein the glass layer and the hologram layer form a transfer layer that transfers image light. The intermediate layer causes the image light to transfer only in the transfer layer in a section from an input area of the image light to an output area of the image light.
    Type: Grant
    Filed: June 16, 2020
    Date of Patent: November 8, 2022
    Assignee: HITACHI-LG DATA STORAGE, INC.
    Inventors: Tomoto Kawamura, Takeru Utsugi, Mitsuru Nagasawa, Hiromichi Yamakawa
  • Patent number: 11442353
    Abstract: A virtual image projection device that generates image light includes a light source that emits light; a microlens array that emits the light, which is emitted from the light source, as light having a predetermined angle distribution; an imaging lens that concentrates the light from the microlens array; a display unit that is irradiated with the light, which is concentrated by the imaging lens, to generate an image; and a projection unit that projects the image, which is generated by the display unit, as image light. The microlens array is disposed such that short side directions of lens cells do not line up straight.
    Type: Grant
    Filed: March 29, 2021
    Date of Patent: September 13, 2022
    Assignee: HITACHI-LG DATA STORAGE, INC.
    Inventors: Takahiro Mouri, Ryuji Ukai, Takuma Kuno, Toshiteru Nakamura
  • Patent number: 11428939
    Abstract: The present invention provides a light-guiding plate which is applicable to incident rays over a wide ray angular range and wide wavelength rage, and is able to suppress a decrease in optical efficiency. A light-guiding plate 200 having a light diffracting portion 1200 for diffracting incident light by a multiple-recorded hologram is configured such that, in the light diffracting portion, when light 1210 of a single wavelength having a certain angular range is incident, at least two or more outgoing rays 1220 are discretely emitted with a first angular space ?s, and the emitted rays each have a second angular range ?a, and the first angular space ?s is equal to or larger than the second angular range ?a.
    Type: Grant
    Filed: November 22, 2018
    Date of Patent: August 30, 2022
    Assignee: HITACHI-LG DATA STORAGE, INC.
    Inventors: Takeru Utsugi, Ryuji Ukai
  • Patent number: 11143872
    Abstract: Both uniformity of brightness and uniformity of color of the outside world are seen via a waveguide. A video image is reflected by a partial reflection surface inside the waveguide that includes an incident surface on which video image light is incident, first and second internal reflection surfaces that propagate the video image light incident from the incident surface while totally reflecting the video image light, and are substantially parallel to each other. A plurality of partial reflection surfaces that reflect a part of the video image light propagating by being totally reflected by the first and second internal reflection surfaces, output the part of the video image light as output light from the first internal reflection surface to the outside of the waveguide, and transmit the part of the video image light being incident, and are disposed substantially parallel to each other inside the waveguide.
    Type: Grant
    Filed: September 11, 2018
    Date of Patent: October 12, 2021
    Assignee: HITACHI-LG DATA STORAGE, INC.
    Inventors: Ryuji Ukai, Tomoto Kawamura, Satoshi Ouchi, Yoshiho Seo, Seiji Murata
  • Patent number: 11112610
    Abstract: An image display device projecting an image to a user includes: an image generation unit that generates image light; a projection optical unit that projects the image light generated by the image generation unit; an image light duplication unit that duplicates and emits the image light projected by the projection optical unit; and a light-guiding unit that projects the image light duplicated by the image light duplication unit to a user, in which the projection optical unit includes at least one projection lens, and in which an interval at which the image light duplication unit duplicates the image light is smaller than an outer diameter of the projection lens.
    Type: Grant
    Filed: April 16, 2020
    Date of Patent: September 7, 2021
    Assignee: HITACHI-LG DATA STORAGE, INC.
    Inventors: Takuma Kuno, Ryuji Ukai, Toshiteru Nakamura, Masahito Uchiyama, Takahiro Mouri
  • Patent number: 11106040
    Abstract: To provide a wide eye box and are capable of displaying a video having uniform luminance, it is provided a video display apparatus comprising: a video projection unit configured to project video light; a video light replication unit configured to replicate the video light; and a light guiding unit configured to transmit the video light through an inside of the light guiding unit, wherein the video light replication unit is configured to transmit the video light emitted from the video projection unit to the light guiding unit, wherein the light guiding unit is configured to transmit the video light that has entered through the inside to output the video light, and wherein the video light replication unit is configured to replicate the video light that has entered the video light replication unit so that a luminance distribution of the video light output from the light guiding unit is uniform.
    Type: Grant
    Filed: October 18, 2019
    Date of Patent: August 31, 2021
    Assignee: HITACHI-LG DATA STORAGE, INC.
    Inventors: Ryuji Ukai, Toshiteru Nakamura, Takuma Kuno, Satoshi Ouchi
  • Patent number: 11023003
    Abstract: A head mounted display includes a first optical housing mounting a light source and an optical component, a second optical housing mounting an image generating element and an optical component, a securing member connecting and securing the first optical housing and the second optical housing, and an exterior housing holding the first optical housing, the second optical housing, and the securing member. The securing member is fitted with the first optical housing with the second optical housing enclosed to connect and secure the first optical housing and the second optical housing.
    Type: Grant
    Filed: March 22, 2019
    Date of Patent: June 1, 2021
    Assignee: HITACHI-LG DATA STORAGE, INC.
    Inventors: Yoshihiro Satou, Kenji Kiya, Kazuhiko Kuzumaki, Tatsuya Ishitobi, Katsuhiko Kimura