Patents by Inventor Masahiro Murakawa

Masahiro Murakawa 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: 20170108631
    Abstract: The present invention relates to a band-pass filter containing a plurality of films, having a reflective band centered on a predetermined wavelength ? and having a transmission band in a part within the reflective band, in which the band-pass filter further contains an additional layer formed of two continuous layers of a high refractive index film with an optical film thickness of ?/4.5 or less and a low refractive index film with an optical film thickness of ?/4.5 or less, inserted in at least one boundary out of boundaries of the plurality of films.
    Type: Application
    Filed: December 27, 2016
    Publication date: April 20, 2017
    Applicant: Asahi Glass Company, Limited
    Inventors: Masahiro MURAKAWA, Masahiro MORI, Kageyuki SATOU
  • Patent number: 9360602
    Abstract: A transmitting diffraction element may include a transparent substrate, and a plurality of convex parts periodically formed on one surface of the transparent substrate, and be configured to diffract incident light to the transparent substrate. Each of the convex parts may include first, second, third, and fourth layers that are stacked on the transparent substrate. The first and third layers may be made of a material having a high refractive index, and the second and fourth layers may be made of a material having a low refractive index that is lower than the high refractive index.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: June 7, 2016
    Assignee: Asahi Glass Company, Limited
    Inventors: Takeru Wakabayashi, Masahiro Murakawa
  • Publication number: 20150222227
    Abstract: A monitoring system includes a slave device (4) and a master device (5). The slave device (4) superposes a current signal, which represents measurement data obtained by measuring each of one or more solar cell panels included in plural solar cell panels (P1 to P15) constituting a solar cell string (10), to a DC current path. The DC current path includes plural power lines (L1 to L14), a first trunk power line (21), and a second trunk power line (22). The master device (5) is connected onto the first trunk power line (21), second trunk power line (22), or both of the trunk power lines, and receives the measurement data from the slave device (4). Accordingly, the communication performance between the slave device and master device in, for example, a monitoring system that performs monitoring in units of a solar cell panel can be improved.
    Type: Application
    Filed: February 4, 2014
    Publication date: August 6, 2015
    Applicant: Hitachi Industry & Control Solutions, Ltd.
    Inventors: Sadao Nishizawa, Shintaro Suzumura, Tetsuo Itou, Hideki Yoshida, Yuji Kasai, Masahiro Murakawa
  • Patent number: 9031294
    Abstract: A region segmented image data creating system for histopathological images is provided. The region segmented image data creating system is capable of creating region segmented image data required to generating a region segmented image. A first bi-level image data creating section 12 creates first bi-level image data, in which nucleus regions can be discriminated from other regions, from histopathological image data. A second bi-level image data creating section 14 creates second bi-level image data, in which a background regions can be discriminated from other regions, from the histopathological image data. A three-level image data creating section 15 clarifies cytoplasm regions by computing a negative logical addition of the first bi-level image data and the second bi-level image data, and to create three-level image data as the region segmented image data.
    Type: Grant
    Filed: July 22, 2011
    Date of Patent: May 12, 2015
    Assignee: National Institute of Advanced Industrial Science and Technology
    Inventors: Hirokazu Nosato, Hidenori Sakanashi, Masahiro Murakawa, Takumi Kobayashi, Tetsuya Higuchi, Nobuyuki Otsu
  • Patent number: 8982926
    Abstract: Disclosed is a spectrum spread communication system which is hardly influenced by noises, and in which a frame structure can be identified at a receiving side without use of a frame synchronization signal. A spread code generator switches spread codes (“Scai” and “Scbi”) in each frame, and outputs it to a spread modulation unit. The spread modulation unit performs spread modulation of transmission data, and transmits it to a direct current power line. A reference code generator generates reference codes (“Scai” and “Scbi”) in the same code phase. Spread demodulation units performs spread demodulation of the received signal with use of the reference codes (“Scai” and “Scbi”), and output it to a selection unit. A frame synchronization detection unit identifies a frame structure on the basis of switching of a synchronization state of a code phase in a code phase synchronization detection unit.
    Type: Grant
    Filed: June 6, 2011
    Date of Patent: March 17, 2015
    Assignee: National Institute of Advanced Industrial Science and Technology
    Inventors: Yuji Kasai, Masahiro Murakawa, Tetsuya Higuchi
  • Publication number: 20140341235
    Abstract: Each transmitter (4) included in a first transmitter group (40A) transmits, on a first electric wire (2A), a current signal representing a change in current in accordance with a transmission bit sequence. Each transmitter (4) included in a second transmitter group (40B) transmits, on a second electric wire (2B) that is connected in parallel with the first electric wire, a current signal representing a change in current in accordance with a transmission bit sequence. A current detection unit (6A) outputs an electric signal representing a change in a difference current between a first current (IA) flowing through the first electric wire (2A) and a second current (IB) flowing through the second electric wire (2B). A receiver (5A) identifies and receives a reception bit sequence corresponding to the transmission bit sequence of each transmitter (4) included in the first and second transmitter groups, by processing the first electric signal.
    Type: Application
    Filed: May 17, 2013
    Publication date: November 20, 2014
    Inventors: Teruhiko Tagashira, Yukio Hiruta, Hiroshi Honjou, Sadao Nishizawa, Yuji Kasai, Masahiro Murakawa
  • Patent number: 8696134
    Abstract: A depolarization element includes high depolarization for light beams having coherence and plural wavelengths and also provides a projection type display device capable of reducing speckle noise. Unit regions, each formed of m regions (m?4) having different phase differences generated for incident light, are disposed, and two regions extracted from the m regions have at least one combination of regions being different in area. When plural light beams having different wavelengths are incident, the composition of the Stokes vectors of the light beams emitted from the respective m regions is made nearly zero by setting the areas of the respective m regions and the generated phase differences, whereby the light beams having coherence and plural wavelengths can be converted so as to have the polarization state of natural light.
    Type: Grant
    Filed: March 8, 2012
    Date of Patent: April 15, 2014
    Assignee: Asahi Glass Company, Limited
    Inventors: Masahiro Murakawa, Atsushi Koyanagi
  • Publication number: 20130250421
    Abstract: A transmitting diffraction element may include a transparent substrate, and a plurality of convex parts periodically formed on one surface of the transparent substrate, and be configured to diffract incident light to the transparent substrate. Each of the convex parts may include first, second, third, and fourth layers that are stacked on the transparent substrate. The first and third layers may be made of a material having a high refractive index, and the second and fourth layers may be made of a material having a low refractive index that is lower than the high refractive index.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 26, 2013
    Applicant: Asahi Glass Company, Limited
    Inventors: Takeru WAKABAYASHI, Masahiro Murakawa
  • Patent number: 8493991
    Abstract: A master node (12) sends an identification signal for designating a communication channel in an identification signal time slot. When the own node matches the node in which the communication channel designated by the identification signal sent from the master node (12) is set in the identification signal time slot, the master node (12) and slave nodes (131 to 13n) each perform data transmission via the communication channel, based on the set contents of the communication channel, in the data transmission time slot corresponding to the identification signal time slot in which the identification signal has been sent.
    Type: Grant
    Filed: April 20, 2009
    Date of Patent: July 23, 2013
    Assignee: National Institute of Advanced Industrial Science and Technology
    Inventors: Yuji Kasai, Eiichi Takahashi, Masahiro Murakawa, Tetsuya Higuchi
  • Patent number: 8429749
    Abstract: A network system by the present invention can quickly detect viruses and does not easily become a new cause of vulnerability. A packet data comparator branches inputted packet data into three branches, and includes an additional pattern matching unit which compares the branched data with the stored data and performs matching with collation patterns stored in a rewritable storage area, a fixed pattern matching unit which compares the branched data with the stored data and performs the matching with a logical operation configured with known collation patterns, a notification packet matching unit which compares the branched data with the stored data and finds a notification packet, and an identity detection aggregation unit which aggregates results from the respective matching units. Moreover, a virus filter, a virus checker, and a secure network system are realized by using the present invention.
    Type: Grant
    Filed: March 26, 2008
    Date of Patent: April 23, 2013
    Assignee: National Institute of Advanced Industrial Science and Technology
    Inventors: Eiichi Takahashi, Masahiro Yasuda, Yosuke Iijima, Masahiro Murakawa, Kenji Toda, Tetsuya Higuchi
  • Publication number: 20130094733
    Abstract: A region segmented image data creating system for histopathological images is provided. The region segmented image data creating system is capable of creating region segmented image data required to generating a region segmented image. A first bi-level image data creating section 12 creates first bi-level image data, in which nucleus regions can be discriminated from other regions, from histopathological image data. A second bi-level image data creating section 14 creates second bi-level image data, in which a background regions can be discriminated from other regions, from the histopathological image data. A three-level image data creating section 15 clarifies cytoplasm regions by computing a negative logical addition of the first bi-level image data and the second bi-level image data, and to create three-level image data as the region segmented image data.
    Type: Application
    Filed: July 22, 2011
    Publication date: April 18, 2013
    Inventors: Hirokazu Nosato, Hidenori Sakanashi, Masahiro Murakawa, Takumi Kobayashi, Tetsuya Higuchi, Nobuyuki Otsu
  • Publication number: 20130089120
    Abstract: Disclosed is a spectrum spread communication system which is hardly influenced by noises, and in which a frame structure can be identified at a receiving side without use of a frame synchronization signal. A spread code generator switches spread codes (“Scai” and “Scbi”) in each frame, and outputs it to a spread modulation unit. The spread modulation unit performs spread modulation of transmission data, and transmits it to a direct current power line. A reference code generator generates reference codes (“Scai” and “Scbi”) in the same code phase. Spread demodulation units performs spread demodulation of the received signal with use of the reference codes (“Scai” and “Scbi”), and output it to a selection unit. A frame synchronization detection unit identifies a frame structure on the basis of switching of a synchronization state of a code phase in a code phase synchronization detection unit.
    Type: Application
    Filed: June 6, 2011
    Publication date: April 11, 2013
    Applicant: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Yuji Kasai, Masahiro Murakawa, Tetsuya Higuchi
  • Patent number: 8284856
    Abstract: A serial-parallel converter/encoder unit 11 inputs a transmission symbol data at a transmission symbol rate that is one-Nth of a base-point symbol rate. A precoder/collator 13 creates a transmission symbol waveform at the base-point symbol rate. The transmission symbol waveform becomes a transmission signal after passing through a roll-off filter 14 with a band corresponding to the base-point symbol rate and a modulator 15. A reception signal demodulated by a demodulator 33 is input to a fractionally-spaced equalizer 38 that operates at the base-point symbol rate and is forcibly equalized at the transmission symbol rate by using a reference signal. A level of a signal output from the fractionally-spaced equalizer 38 at the transmission symbol rate is determined by a level determining unit 39 and becomes a reception symbol data by a sawtooth-function output unit 40.
    Type: Grant
    Filed: February 13, 2007
    Date of Patent: October 9, 2012
    Assignee: National Institute of Advanced Industrial Science and Technology
    Inventors: Yoichi Sato, Tetsuya Higuchi, Masahiro Murakawa
  • Publication number: 20120236263
    Abstract: A depolarization element includes high depolarization for light beams having coherence and plural wavelengths and also provides a projection type display device capable of reducing speckle noise. Unit regions, each formed of m regions (m?4) having different phase differences generated for incident light, are disposed, and two regions extracted from the m regions have at least one combination of regions being different in area. When plural light beams having different wavelengths are incident, the composition of the Stokes vectors of the light beams emitted from the respective m regions is made nearly zero by setting the areas of the respective m regions and the generated phase differences, whereby the light beams having coherence and plural wavelengths can be converted so as to have the polarization state of natural light.
    Type: Application
    Filed: March 8, 2012
    Publication date: September 20, 2012
    Applicant: Asahi Glass Company, Limited
    Inventors: Masahiro MURAKAWA, Atsushi Koyanagi
  • Publication number: 20120062848
    Abstract: A projection type display apparatus includes: a light source section including at least one light source for emitting coherent light; an image light generating section for modulating the light emitted from the light source section so as to generate image light; a projection section for projecting the image light; and a depolarization element for transmitting the incident light in a state that a polarization state of at least a part of the light is changed, the depolarization being provided on an optical path of the light emitted from the light source section, wherein a plurality of unit regions having a particular shape are aligned in the depolarization element.
    Type: Application
    Filed: September 8, 2011
    Publication date: March 15, 2012
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Atsushi Koyanagi, Masahiro Murakawa
  • Publication number: 20110142066
    Abstract: A master node (12) sends an identification signal for designating a communication channel in an identification signal time slot. When the own node matches the node in which the communication channel designated by the identification signal sent from the master node (12) is set in the identification signal time slot, the master node (12) and slave nodes (131 to 13n) each perform data transmission via the communication channel, based on the set contents of the communication channel, in the data transmission time slot corresponding to the identification signal time slot in which the identification signal has been sent.
    Type: Application
    Filed: April 20, 2009
    Publication date: June 16, 2011
    Applicant: Nat'I Inst of Advanced Industrial Sci and Tech
    Inventors: Yuji Kasai, Eiichi Takahashi, Masahiro Murakawa, Tetsuya Higuchi
  • Patent number: 7764354
    Abstract: A multi-layer diffraction type polarizer is formed by laminating at least two polarizing diffraction gratings each having a birefringent material which straightly transmits incident light having a first polarization direction without functioning as a diffraction grating, and diffracts incident light having a second polarization direction perpendicular to the first polarization direction by functioning as a diffraction grating. Further, in order to realize an optical attenuator having a high extinction ratio even at low voltage, a phase plate made of an organic thin film is provided to cancel the retardation of the liquid crystal cell remaining when the voltage is applied. Further, in order to rotate the polarization direction of a linearly polarized incident light, the liquid crystal cell is provided with a ?/4 phase plate comprising an organic thin film.
    Type: Grant
    Filed: December 22, 2005
    Date of Patent: July 27, 2010
    Assignee: Asahi Glass Company, Limited
    Inventors: Yoshiharu Ooi, Masahiro Murakawa
  • Patent number: 7688700
    Abstract: A phase correction element comprising a first phase correction layer formed in a region of numerical aperture NA2, and a first phase plate; the first phase correction layer comprising a concavo-convex portion having a rotational symmetry with respect to the optical axis of incident light and having a cross-sectional shape of a saw-tooth-form or a saw-tooth-form whose convex portions are each approximated by a step form; the first phase plate generating a birefringent phase difference of about an odd number times of ?/2 for linearly polarized light of ?1; and the phase correction element that does change a transmitted wavefront of ?1 and changing a transmitted wavefront of the ?2 or transmitted wavefront of both wavelengths of ?2 and ?3 when three types of incident light at ?1=410 nm, ?2=650 nm and ?3=780 nm respectively, are incident.
    Type: Grant
    Filed: January 31, 2005
    Date of Patent: March 30, 2010
    Assignee: Asahi Glass Company, Limited
    Inventors: Yoshiharu Ooi, Masahiro Murakawa, Hiromasa Sato, Masao Miyamura
  • Publication number: 20100061441
    Abstract: A serial-parallel converter/encoder unit 11 inputs a transmission symbol data at a transmission symbol rate that is one-Nth of a base-point symbol rate. A precoder/collator 13 creates a transmission symbol waveform at the base-point symbol rate. The transmission symbol waveform becomes a transmission signal after passing through a roll-off filter 14 with a band corresponding to the base-point symbol rate and a modulator 15. A reception signal demodulated by a demodulator 33 is input to a fractionally-spaced equalizer 38 that operates at the base-point symbol rate and is forcibly equalized at the transmission symbol rate by using a reference signal. A level of a signal output from the fractionally-spaced equalizer 38 at the transmission symbol rate is determined by a level determining unit 39 and becomes a reception symbol data by a sawtooth-function output unit 40.
    Type: Application
    Filed: February 13, 2007
    Publication date: March 11, 2010
    Applicant: National Institute of Advanced Industrial Science and Technology
    Inventors: Yoichi Sato, Tetsuya Higuchi, Masahiro Murakawa
  • Publication number: 20100020671
    Abstract: The present invention provides a phase correction element which can be used for recording and/or reproducing an information of three types of optical disks for HD, DVD and CD by employing a single objective lens for HD, and an optical head device.
    Type: Application
    Filed: January 31, 2005
    Publication date: January 28, 2010
    Applicant: ASAHI GLASS COMPANY LIMITED
    Inventors: Yoshiharu Ooi, Masahiro Murakawa, Hiromasa Sato, Masao Miyamura