Patents by Inventor Hisataka Sugiyama

Hisataka Sugiyama 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: 20230044712
    Abstract: A distance measurement system includes a distance measurement device and an external processing device. Here, the distance measurement device receives reflected light from a subject for a plurality of exposure periods in a frame in which irradiation light is emitted, switches a plurality of distance calculation expressions according to an amount of charge measured for each exposure period, and calculates a measured distance to the subject from the amount of charge measured for each exposure period. The external processing device acquires the measured distance from the distance measurement device and performs data processing. Then, the external processing device predicts a measured distance including a distance error caused by an influence of multipath. The external processing device generates a correction expression for correcting the measured distance. The external processing device corrects the measured distance acquired from the distance measurement device using the correction expression.
    Type: Application
    Filed: July 19, 2022
    Publication date: February 9, 2023
    Inventors: Katsumi ITO, Katsuhiko IZUMI, Hisataka SUGIYAMA
  • 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: 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
  • Publication number: 20220342049
    Abstract: The distance measurement system is a system for measuring a distance to a target by a time of flight of light using a plurality of distance measurement image pickup apparatuses. The plurality of distance measurement image pickup apparatuses emits pulsed light at different intervals having a relatively prime relationship. Further, an interval of pulsed light rays is set based on any one of (1) a value obtained by raising a prime number to a power of a natural number of 2 or more used as an exponent, (2) a value obtained by multiplying a prime number by a natural number of 2 or more used as an integer, and (3) a value obtained by multiplying the value obtained by raising the prime number to the power by a natural number of 2 or more used as an integer.
    Type: Application
    Filed: April 6, 2022
    Publication date: October 27, 2022
    Inventors: Hisataka SUGIYAMA, Katsuhiko IZUMI, Katsumi ITO
  • Publication number: 20220342050
    Abstract: The distance measurement system is a system for measuring a distance to a target by a time of flight of light using a plurality of distance measurement image pickup apparatuses. The plurality of distance measurement image pickup apparatuses may emit pulsed light rays at a plurality of different pulse widths. Further, intervals of pulsed light rays from the plurality of distance measurement image pickup apparatuses are set to be proportional to pulse widths in the respective distance measurement image pickup apparatuses. Further, the respective distance measurement image pickup apparatuses emit pulsed light rays at intervals of the pulsed light rays corresponding to pulse widths and the intervals of the pulsed light rays different from each other.
    Type: Application
    Filed: April 6, 2022
    Publication date: October 27, 2022
    Inventors: Hisataka SUGIYAMA, Katsuhiko IZUMI, Katsumi ITO
  • Publication number: 20210285757
    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: Application
    Filed: November 30, 2020
    Publication date: September 16, 2021
    Inventors: Hiroshi OGASAWARA, Toshimichi SHINTANI, Takahiro KOMAKI, Hisataka SUGIYAMA
  • Publication number: 20200110177
    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: Application
    Filed: August 27, 2019
    Publication date: April 9, 2020
    Inventors: Toshimasa KAMISADA, Kozo MASUDA, Hisataka SUGIYAMA, Toshimichi SHINTANI
  • Patent number: 7995082
    Abstract: A recording medium including a plurality of recording layers, including: an optional first recording layer on which a light spot at a diffraction limit is formed; and a second recording layer on which a mark string pattern is formed, said second recording layer being different from said first recording layer, wherein when said mark string pattern is formed on a light receiving plane, while information of said first recording layer is reproduced, assuming that an optical distance between said first and second recording layers is dm, an optical distance d between optional two recording layers among a plurality of said recording layers is different from said dm.
    Type: Grant
    Filed: July 23, 2007
    Date of Patent: August 9, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Hisataka Sugiyama, Takeshi Maeda, Kiyoshi Matsumoto, Motoyasu Terao, Shigenori Okamine, Tetsuya Nishida, Harukazu Miyamoto
  • Patent number: 7724625
    Abstract: When the data is reproduced by irradiating a laser beam onto the optical disk, an amount-of-irradiation-beam detection signal is produced according to the amount of the laser beam irradiated onto the optical disk, and the defect on the optical disk is detected on the basis of this amount-of-irradiation-beam detection signal. In addition, when the data is reproduced by irradiating the laser beam onto the optical disk, the amount-of-irradiation-beam detection signal is produced according to the amount of the laser beam irradiated onto the optical disk, an amount-of-reflected-beam detection signal is produced in accordance with the amount of the laser beam reflected from the optical disk, and the defect on the optical disk is detected on the basis of the amount-of-irradiation-beam detection signal and the amount-of-reflected-beam detection signal. Even when the optical disk has a defect, the laser beam is continuously irradiated onto the optical disk.
    Type: Grant
    Filed: January 18, 2008
    Date of Patent: May 25, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Hiroyuki Hori, Hisataka Sugiyama, Masanori Matsuzaki
  • Publication number: 20090075013
    Abstract: A recording medium including a plurality of recording layers, including: an optional first recording layer on which a light spot at a diffraction limit is formed; and a second recording layer on which a mark string pattern is formed, said second recording layer being different from said first recording layer, wherein when said mark string pattern is formed on a light receiving plane, while information of said first recording layer is reproduced, assuming that an optical distance between said first and second recording layers is dm, an optical distance d between optional two recording layers among a plurality of said recording layers is different from said dm.
    Type: Application
    Filed: July 30, 2008
    Publication date: March 19, 2009
    Inventors: Hisataka Sugiyama, Takeshi Maeda, Kiyoshi Matsumoto, Motoyasu Terao, Shigenori Okamine, Tetsuya Nishida, Harukazu Miyamoto
  • Publication number: 20080112290
    Abstract: When the data is reproduced by irradiating a laser beam onto the optical disk, an amount-of-irradiation-beam detection signal is produced according to the amount of the laser beam irradiated onto the optical disk, and the defect on the optical disk is detected on the basis of this amount-of-irradiation-beam detection signal. In addition, when the data is reproduced by irradiating the laser beam onto the optical disk, the amount-of-irradiation-beam detection signal is produced according to the amount of the laser beam irradiated onto the optical disk, an amount-of-reflected-beam detection signal is produced in accordance with the amount of the laser beam reflected from the optical disk, and the defect on the optical disk is detected on the basis of the amount-of-irradiation-beam detection signal and the amount-of-reflected-beam detection signal. Even when the optical disk has a defect, the laser beam is continuously irradiated onto the optical disk.
    Type: Application
    Filed: January 18, 2008
    Publication date: May 15, 2008
    Applicant: Hitachi, Ltd.
    Inventors: Hiroyuki HORI, Hisataka Sugiyama, Masanori Matsuzaki
  • Patent number: 7339870
    Abstract: When the data is reproduced by irradiating a laser beam onto the optical disk, an amount-of-irradiation-beam detection signal is produced according to the amount of the laser beam irradiated onto the optical disk, and the defect on the optical disk is detected on the basis of this amount-of-irradiation-beam detection signal. In addition, when the data is reproduced by irradiating the laser beam onto the optical disk, the amount-of-irradiation-beam detection signal is produced according to the amount of the laser beam irradiated onto the optical disk, an amount-of-reflected-beam detection signal is produced in accordance with the amount of the laser beam reflected from the optical disk, and the defect on the optical disk is detected on the basis of the amount-of-irradiation-beam detection signal and the amount-of-reflected-beam detection signal. Even when the optical disk has a defect, the laser beam is continuously irradiated onto the optical disk.
    Type: Grant
    Filed: July 28, 2004
    Date of Patent: March 4, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Hiroyuki Hori, Hisataka Sugiyama, Masanori Matsuzaki
  • Publication number: 20080012934
    Abstract: A recording medium including a plurality of recording layers, including: an optional first recording layer on which a light spot at a diffraction limit is formed; and a second recording layer on which a mark string pattern is formed, said second recording layer being different from said first recording layer, wherein when said mark string pattern is formed on a light receiving plane, while information of said first recording layer is reproduced, assuming that an optical distance between said first and second recording layers is dm, an optical distance d between optional two recording layers among a plurality of said recording layers is different from said dm.
    Type: Application
    Filed: July 23, 2007
    Publication date: January 17, 2008
    Inventors: Hisataka Sugiyama, Takeshi Maeda, Kiyoshi Matsumoto, Motoyasu Terao, Shigenori Okamine, Tetsuya Nishida, Harukazu Miyamoto
  • Publication number: 20070283375
    Abstract: An optical disc apparatus capable of restraining thermal deformation of an optical disc due to transmission of a heat from a spindle motor to the disc, comprises a turn table rotated by the spindle motor, for holding the disc, a bearing portion provided in the spindle motor, for holding a rotary shaft of the table, and a cooling element provided at the outer periphery of the bearing portion, for thermoelectrically cooling the bearing portion. The bearing portion can be directly cooled by the cooling element. Since the heat from the spindle motor is transmitted to the table through the bearing portion, the heat generated from the motor can be prevented from being transmitted to the table by cooling the bearing portion, and further, the table can be cooled. Thus, no heat is transmitted from the table to the optical disc, thereby thermal deformation of the optical disc can be retrained.
    Type: Application
    Filed: January 10, 2007
    Publication date: December 6, 2007
    Applicant: Hitachi, Ltd.
    Inventors: Kiyofumi Miyake, Takao Naito, Akinori Shiozawa, Hisataka Sugiyama
  • Publication number: 20070283376
    Abstract: There is provided an optical disk apparatus that can inhibit, during recording or reproduction of data on or from an optical disk, a side runout that may occur in the optical disk in its circumferential direction as a result of Coriolis force when a disk rotating shift is subjected to procession movement, thereby allowing recording and reproducing quality to be stabilized and a reduced size of the apparatus. The disk apparatus provided has pressure pawls arranged at intervals smaller than those in the prior art, each of which is provided with a plurality of pressing points arranged at intervals larger than those in the prior art. Particularly, an interval between the pressure pawls is an acute angle in terms of the center angle of the disk. An interval between the pressing points is an angle of 35° or larger.
    Type: Application
    Filed: January 26, 2007
    Publication date: December 6, 2007
    Applicant: Hitachi, Ltd.
    Inventors: Takao Naito, Kazuyuki Kodama, Akinori Shiozawa, Hisataka Sugiyama
  • Patent number: 7286153
    Abstract: In a three-dimensional recording and reproducing apparatus having a recording medium including a plurality of recording layers stacked on a substrate and an optical system for converging a light irradiated from the substrate side on each of the plurality of recording layers to three-dimensionally record and reproduce information, the following equation is satisfied: ?/4?(1/8NB)(1/NB2?1)NAF4?d where ?: Wavelength of the light; NB: Refractivity of the substrate 3; NAF: Numerical aperture of a focus lens 8 for converging a light; ?d: Positional range in the optical axis direction in which exists a recording layer on which the light is to be converged. A light spot is focused on each layer of the multi-layer structured disc to record and reproduce highly reliable data in a high density.
    Type: Grant
    Filed: April 26, 1995
    Date of Patent: October 23, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Hisataka Sugiyama, Takeshi Maeda, Kiyoshi Matsumoto, Motoyasu Terao, Shigenori Okamine, Tetsuya Nishida, Harukazu Miyamoto
  • Patent number: 7218586
    Abstract: Because a series of data is recorded continuously, the recording quality of data recorded in course of recording cannot be evaluated. Accordingly, the laser output cannot be controlled properly and there are a deterioration and dispersion of the recording quality. Further, when the recording lasts for a long time, the temperature in the vicinity of laser rises due to the heat from the inside of a disc drive and the recording quality is deteriorated. To solve this, a series of data to be recorded is split and recording is made intermittently in a split data unit. The recording quality is evaluated by reproducing the data recorded nearby before each split data is recorded using a duration and control is performed by reflecting the evaluation result in the laser output so that the recording quality can be maintained satisfactorily over a series of the whole data to be recorded.
    Type: Grant
    Filed: September 2, 2005
    Date of Patent: May 15, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Tatsuya Ishitobi, Hiroaki Ono, Hisataka Sugiyama
  • Patent number: 7161883
    Abstract: When user data is recorded on a write-once medium, linking variations can be reduced that are produced as management information for managing the user data is updated by additionally recording on and off, thereby assuring the reliability of the reproduction compatibility of the DVD player. Before the final file of the management information is recorded, dummy data of a plurality of successive blocks are recorded at a time by a single operation, and then the final file is additionally recorded after the dummy data. Therefore, the linking precision can be prevented from being degraded in the linking portions of the management information, and thus the management information can be properly read when the DVD player makes compatible reproduction of the medium.
    Type: Grant
    Filed: May 20, 2003
    Date of Patent: January 9, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Akinori Shiozawa, Horoaki Ono, Hisataka Sugiyama
  • Patent number: 7151721
    Abstract: An optical reproducing apparatus for reproducing information on a medium includes a light source, an optical system for irradiating a light beam generated by the light source on the medium, a detector for detecting a reflected light from the medium; and a reproducer means for reproducing information on the medium by using a signal from the detector. The medium is a substrate having grooves and lands alternately formed thereon in a radial direction, which serve as recording tracks and have prepits.
    Type: Grant
    Filed: July 8, 2005
    Date of Patent: December 19, 2006
    Assignees: Hitachi, Ltd., Hitachi Maxell, Ltd.
    Inventors: Harukazu Miyamoto, Hiroyuki Minemura, Hisataka Sugiyama
  • Patent number: 7106669
    Abstract: A reproducing apparatus for reproducing information recorded on an optical recording medium including a disk-like substrate, a plurality of tracks extending in a circumferential direction on the substrate and associated with a plurality of grooves, with a plurality of zones provided on the disk-like substrate and extending between a first position and a second position in a radial direction of the substrate. Each zone includes at least two tracks with each track being divided into a plurality of recording units of circular arc shape extending in the circumferential direction. The apparatus includes an irradiation source for irradiating a light spot on the optical recording medium, an optical detector for detecting a reflected light from the medium, and a reproducer for reproducing information by using a signal from the detector.
    Type: Grant
    Filed: July 13, 2005
    Date of Patent: September 12, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Harukazu Miyamoto, Yoshio Suzuki, Motoyuki Suzuki, Hisataka Sugiyama, Hiroyuki Minemura, Tetsuya Fushimi, Nobuhiro Tokushuku