Patents by Inventor Tsutomu Kai

Tsutomu Kai 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: 10659001
    Abstract: An elastic wave device includes a lamination layer film including a piezoelectric thin film on a support substrate. The lamination layer film is not partially present in a region located in an outer side portion of a region where IDT electrodes are provided. A first insulation layer extends from at least a portion of a region where the lamination layer film is not present to an upper portion of the piezoelectric thin film. A wiring electrode extends from the upper portion of the piezoelectric thin film to an upper portion of the first insulation layer, and extends onto a section of the first insulation layer in the region.
    Type: Grant
    Filed: December 5, 2017
    Date of Patent: May 19, 2020
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Koji Yamamoto, Tsutomu Takai, Seiji Kai, Hisashi Yamazaki, Yuji Miwa, Takashi Yamane
  • Patent number: 10659002
    Abstract: An elastic wave device includes a lamination layer film including a piezoelectric thin film on a support substrate. The lamination layer film is not partially present in a region located in an outer side portion of a region where IDT electrodes are provided. A first insulation layer extends from at least a portion of a region where the lamination layer film is not present to an upper portion of the piezoelectric thin film. A wiring electrode has a width of about 6 ?m and extends from the upper portion of the piezoelectric thin film to an upper portion of the first insulation layer, and extends onto a section of the first insulation layer in the region.
    Type: Grant
    Filed: August 22, 2018
    Date of Patent: May 19, 2020
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Koji Yamamoto, Tsutomu Takai, Seiji Kai, Hisashi Yamazaki, Yuji Miwa, Takashi Yamane, Noriyoshi Ota, Atsushi Tanaka
  • Patent number: 10630059
    Abstract: A surface emitting quantum cascade laser includes an active layer and a first semiconductor layer. The active layer includes a plurality of quantum well layers and is capable of emitting laser light by intersubband transition. The first surface includes an internal region and an outer peripheral region. Grating pitch of the first pits is m times grating pitch of the second pits. The outer peripheral region surrounds the internal region. A first planar shape of an opening end of the first pit is asymmetric with respect to a line passing through barycenter of the first planar shape and is parallel to at least one side of the first two-dimensional grating. A second planar shape of an opening end of the second pit is symmetric with respect to each of lines passing through barycenter of the second planar shape and is parallel to either side of the second two-dimensional grating.
    Type: Grant
    Filed: August 12, 2019
    Date of Patent: April 21, 2020
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Shinji Saito, Tsutomu Kakuno, Rei Hashimoto, Kei Kaneko, Yasunobu Kai
  • Publication number: 20200006922
    Abstract: A surface emitting quantum cascade laser includes an active layer and a first semiconductor layer. The active layer includes a plurality of quantum well layers and is capable of emitting laser light by intersubband transition. The first surface includes an internal region and an outer peripheral region. Grating pitch of the first pits is m times grating pitch of the second pits. The outer peripheral region surrounds the internal region. A first planar shape of an opening end of the first pit is asymmetric with respect to a line passing through barycenter of the first planar shape and is parallel to at least one side of the first two-dimensional grating. A second planar shape of an opening end of the second pit is symmetric with respect to each of lines passing through barycenter of the second planar shape and is parallel to either side of the second two-dimensional grating.
    Type: Application
    Filed: August 12, 2019
    Publication date: January 2, 2020
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Shinji SAITO, Tsutomu KAKUNO, Rei HASHIMOTO, Kei KANEKO, Yasunobu KAI
  • Patent number: 10490979
    Abstract: A substrate including a photonic crystal has a compound semiconductor, dielectric layers, and a first semiconductor layer. The dielectric layers are provided on a surface of the compound semiconductor substrate and disposed at each grating point of a two-dimensional diffraction grating, each of the dielectric layers having an asymmetric shape in relation to at least one edge of the two-dimensional diffraction grating and having a refractive index lower than a refractive index of the compound semiconductor substrate. The first semiconductor layer includes a flat first face covering the dielectric layers and the surface of the compound semiconductor substrate, a layer constituting the first face containing a material capable of being lattice matched to a material constituting the compound semiconductor substrate.
    Type: Grant
    Filed: December 27, 2017
    Date of Patent: November 26, 2019
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Rei Hashimoto, Shinji Saito, Tsutomu Kakuno, Kei Kaneko, Yasunobu Kai, Naotada Okada
  • Patent number: 10424899
    Abstract: A surface emitting quantum cascade laser includes an active layer and a first semiconductor layer. The active layer includes a plurality of quantum well layers and is capable of emitting laser light by intersubband transition. The first surface includes an internal region and an outer peripheral region. Grating pitch of the first pits is m times grating pitch of the second pits. The outer peripheral region surrounds the internal region. A first planar shape of an opening end of the first pit is asymmetric with respect to a line passing through barycenter of the first planar shape and is parallel to at least one side of the first two-dimensional grating. A second planar shape of an opening end of the second pit is symmetric with respect to each of lines passing through barycenter of the second planar shape and is parallel to either side of the second two-dimensional grating.
    Type: Grant
    Filed: September 4, 2018
    Date of Patent: September 24, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Shinji Saito, Tsutomu Kakuno, Rei Hashimoto, Kei Kaneko, Yasunobu Kai
  • Publication number: 20190199064
    Abstract: A substrate including a photonic crystal has a compound semiconductor, dielectric layers, and a first semiconductor layer. The dielectric layers are provided on a surface of the compound semiconductor substrate and disposed at each grating point of a two-dimensional diffraction grating, each of the dielectric layers having an asymmetric shape in relation to at least one edge of the two-dimensional diffraction grating and having a refractive index lower than a refractive index of the compound semiconductor substrate. The first semiconductor layer includes a flat first face covering the dielectric layers and the surface of the compound semiconductor substrate, a layer constituting the first face containing a material capable of being lattice matched to a material constituting the compound semiconductor substrate.
    Type: Application
    Filed: December 27, 2017
    Publication date: June 27, 2019
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Rei HASHIMOTO, Shinji Saito, Tsutomu Kakuno, Kei Kaneko, Yasunobu Kai, Naotada Okada
  • Patent number: 9959901
    Abstract: An inspection method for a recordable optical disc includes focusing laser light on a recording layer and obtaining a data signal dependent on the laser light reflected by the recording layer. The inspection method also includes determining whether the optical disc includes a defect or not by identifying a first period every second period in the obtained data signal obtained, the first period being a period in which a signal level of the data signal is lower than a predetermined value, and each of the second periods corresponding to an ECC block, and outputting a result of the determination.
    Type: Grant
    Filed: February 8, 2017
    Date of Patent: May 1, 2018
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Harumitsu Miyashita, Yasumori Hino, Junichi Minamino, Tsutomu Kai
  • Publication number: 20180102139
    Abstract: An inspection method for a recordable optical disc includes focusing laser light on a recording layer and obtaining a data signal dependent on the laser light reflected by the recording layer. The inspection method also includes determining whether the optical disc includes a defect or not by identifying a first period every second period in the obtained data signal obtained, the first period being a period in which a signal level of the data signal is lower than a predetermined value, and each of the second periods corresponding to an ECC block, and outputting a result of the determination.
    Type: Application
    Filed: February 8, 2017
    Publication date: April 12, 2018
    Inventors: Harumitsu MIYASHITA, Yasumori HINO, Junichi MINAMINO, Tsutomu KAI
  • Publication number: 20070047926
    Abstract: The present invention provides a signal processing device for optical discs that is capable of more accurately check signal quality at a higher speed than the conventional technique, even if a playback RF signal is deteriorated. A short recording mark detecting unit 115 detects short recording marks in an RF signal read from an optical disc 101, the short recording mark counting unit 116 counts a first short recording mark number as the number of the detected short recording marks, an error number counting unit 110 counts errors in the RF signal, an error number converting unit 111 converts the number of the errors to a second short recording mark number equivalent to the number of the errors, and a signal quality judging unit 112 judges recording quality based on a total of the first and second short recording mark numbers.
    Type: Application
    Filed: August 30, 2006
    Publication date: March 1, 2007
    Inventors: Katsumi Morita, Masaharu Imura, Yoichi Ogura, Tsutomu Kai, Shinichi Konishi, Yorikazu Takao
  • Patent number: 7106668
    Abstract: A disk drive apparatus for a disk having helically-formed or concentric circle-like formed tracks includes a spindle motor for controlling a rotation of the disk; a pick-up device for recording or reproducing information on or from the disk; a stepping motor for moving the pick-up device in a radial direction of the disk in accordance with a drive current; a system controller for tracking a rotation speed of the spindle motor and for outputting command signals according to the rotation speed of the spindle motor; and a stepping motor controller for controlling the stepping motor by changing a slope of a rising part and a falling part of a waveform of the drive current of the stepping motor according to the command signals.
    Type: Grant
    Filed: October 12, 2004
    Date of Patent: September 12, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takanori Okada, Shuichi Yoshida, Masaharu Imura, Kiyoshi Masaki, Kazuhiro Mihara, Tsutomu Kai, Noritaka Akagi, Masanori Harui, Kazuhiko Kouno
  • Patent number: 7085200
    Abstract: A disk apparatus includes a pick-up for reading/writing signals from/on a disk; a pick-up base provided with the pick-up; a traverse motor for moving the pick-up in a radial direction of said disk; a feed screw rotated by the traverse motor and provided with a thread groove on its periphery; a rack having a fixing portion fixed to the pick-up base and a nut portion engaged with the thread groove; a guiding mechanism for guiding the pick-up movably in a radial direction of the disk; and a cantilever parallel spring for connecting the fixing portion to the nut portion of the rack, displaceably in a radial direction of the feed screw.
    Type: Grant
    Filed: October 12, 2004
    Date of Patent: August 1, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takanori Okada, Shuichi Yoshida, Masaharu Imura, Kiyoshi Masaki, Kazuhiro Mihara, Tsutomu Kai, Noritaka Akagi
  • Patent number: 6992959
    Abstract: In a DVD player, when data information in a DVD disk is played back, it is judged whether the data information is protected by a copyright or not on the basis of disk control information. Further, it is judged whether the DVD disk is writable or not, based on whether the DVD disk is provided with a wobble or not. Thus, if the data information is protected by the copyright and the DVD disk is writable, a playback of the DVD disk is prevented so that an illegal use of the DVD disk, which infringes the copyright, is effectively prevented.
    Type: Grant
    Filed: November 2, 1999
    Date of Patent: January 31, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshihiro Tosaki, Tsutomu Kai, Shinji Inoue, Hiromichi Shimada
  • Patent number: 6989811
    Abstract: A driving circuit of a liquid crystal display device includes driver output lines connected to outputs of a data line driver, m pieces of block selection signal lines for sequentially selecting m pieces of blocks, and data lines for supplying data to a display area. A switch sequentially connects an ith driver output line to ith, i+2jth, . . . , and i+2jx(m?1)th data lines in response to signals on the m pieces of block selection signal lines when j is a positive integer smaller than m.
    Type: Grant
    Filed: January 3, 2002
    Date of Patent: January 24, 2006
    Assignee: Fujitsu Display Technologies Corporation
    Inventors: Hiromi Enomoto, Hongyong Zhang, Tsutomu Kai, Masanori Nakamura, Susumu Okazaki
  • Patent number: 6950377
    Abstract: An information recording method of recording information, in which laser light is applied to a recording medium while depending on predetermined information said laser light is modulated and the intensity of said light is controlled to form recording mark areas at which reflectivity of said recording medium changes, depending on the intensity of said applied light, wherein before starting data recording, said light is applied to said recording medium at predetermined light intensity, reflection light from said recording mark areas of said recording medium is received, the amount of said reflection light is detected, and a light intensity controlling reference value is calculated on the basis of the amount of said detected light, and during data recording, reflection light from said recording mark areas of said recording medium is received, the amount of said reflection light is detected, and a light intensity controlling detection value is calculated on the basis of the amount of said detected light, correcte
    Type: Grant
    Filed: June 25, 2002
    Date of Patent: September 27, 2005
    Assignee: Matsushita Electric Industial Co., Ltd.
    Inventors: Takumi Matsuura, Tsutomu Kai, Masaharu Imura
  • Patent number: 6925041
    Abstract: In order to determine a laser emission waveform rule for a recording medium, such as a write-once optical disc, the present invention provides an information recording apparatus, an information recording method and an information recording system capable of determining optimal recording conditions by recording data for approximately one rotation, by reproducing the recorded area, by measuring a phase error for each combination of the length of a mark and the length of a space immediately before or after the mark and by changing an emission waveform rule on the basis of the measured phase error.
    Type: Grant
    Filed: May 13, 2002
    Date of Patent: August 2, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tsutomu Kai, Takumi Matsuura, Yoshitaka Mitsui
  • Publication number: 20050083800
    Abstract: A disk drive apparatus for a disk having helically-formed or concentric circle-like formed tracks includes a spindle motor for controlling a rotation of the disk; a pick-up device for recording or reproducing information on or from the disk; a stepping motor for moving the pick-up device in a radial direction of the disk in accordance with a drive current; a system controller for tracking a rotation speed of the spindle motor and for outputting command signals according to the rotation speed of the spindle motor; and a stepping motor controller for controlling the stepping motor by changing a slope of a rising part and a falling part of a waveform of the drive current of the stepping motor according to the command signals.
    Type: Application
    Filed: October 12, 2004
    Publication date: April 21, 2005
    Inventors: Takanori Okada, Shuichi Yoshida, Masaharu Imura, Kiyoshi Masaki, Kazuhiro Mihara, Tsutomu Kai, Noritaka Akagi, Masanori Harui, Kazuhiko Kouno
  • Patent number: 6873378
    Abstract: A liquid crystal display panel of the active matrix drive type is disclosed. Each pixel is provided with an storage capacitor, wherein capacitors for stabilizing the voltage are added to the common storage capacitor bus line that applies a predetermined potential to the storage capacitor bus lines provided for each of the rows to absorb noise that mixes into the storage capacitor bus lines through parasitic capacitances, thereby to decrease fluctuation in the voltage of the storage capacitor bus lines and to prevent the occurrence of display unevenness and crosstalk. Capacitors Ccs for stabilizing the voltage are added to a common storage capacitor bus line (vertical Cs line) 5 that applies a predetermined potential (storage capacitor bus line voltage Vcs) to the storage capacitor bus lines (horizontal Cs lines) 4 provided for each of the rows to form a common side of the storage capacitors Cs formed in each of the pixels.
    Type: Grant
    Filed: October 9, 2002
    Date of Patent: March 29, 2005
    Assignee: Fujitsu Display Technologies Corporation
    Inventor: Tsutomu Kai
  • Publication number: 20050047290
    Abstract: A disk apparatus includes a pick-up for reading/writing signals from/on a disk; a pick-up base provided with the pick-up; a traverse motor for moving the pick-up in a radial direction of said disk; a feed screw rotated by the traverse motor and provided with a thread groove on its periphery; a rack having a fixing portion fixed to the pick-up base and a nut portion engaged with the thread groove; a guiding mechanism for guiding the pick-up movably in a radial direction of the disk; and a cantilever parallel spring for connecting the fixing portion to the nut portion of the rack, displaceably in a radial direction of the feed screw.
    Type: Application
    Filed: October 12, 2004
    Publication date: March 3, 2005
    Inventors: Takanori Okada, Shuichi Yoshida, Masaharu Imura, Kiyoshi Masaki, Kazuhiro Mihara, Tsutomu Kai, Noritaka Akagi
  • Patent number: 6853364
    Abstract: A liquid crystal display device includes a display circuit having data lines and scanning lines arranged in two-dimensional matrix, and switching elements connected between the data lines and the scanning lines. A first inspection circuit is also provided, including an inspection voltage input and/or output terminal for inputting and/or outputting an inspection voltage to/from one ends of the data lines via a first analog switch. A second inspection circuit includes an inspection voltage input and/or output terminal for inputting and/or outputting an inspection voltage to/from the other ends of the data lines. The display circuit, the first inspection circuit, and the second inspection circuit are provided on one substrate, and the first inspection circuit is constructed to be separated from the rest of the display circuit.
    Type: Grant
    Filed: December 18, 2001
    Date of Patent: February 8, 2005
    Assignee: Fujitsu Display Technologies Corporation
    Inventors: Tsutomu Kai, Susumu Okazaki, Hongyong Zhang, Noriyuki Ohashi