# Kentaro Nagai, Yokohama-Shi JP

## Kentaro Nagai, Yokohama-Shi JP

Patent application number | Description | Published |
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20090029220 | FUEL CELL - A fuel cell including an electrolyte film, a catalyst layer, two diffusion layers, a fuel supply layer, an oxygen supply layer, a water-absorbing layer, and a collector. The fuel cell has an opening at least in a part of a side surface parallel to a proton conduction direction of the electrolyte film among side surfaces of the fuel cell. The water-absorbing layer is present between the oxygen supply layer and the collector. An end portion of the water-absorbing layer is present on one of a plane including the opening and an opposite side of the fuel cell with the plane including the opening being a reference. A fuel cell system having a fuel cell stack including the fuel cells. The fuel cell has a high water discharging ability and is capable of maintaining stable high generation efficiency and providing a high output even while being small-sized and light-weight. | 01-29-2009 |

20100290590 | X-RAY IMAGING APPARATUS, X-RAY IMAGING METHOD, AND X-RAY IMAGING PROGRAM - An X-ray imaging apparatus includes a phase grating, an absorption grating, a detector, and an arithmetic unit. The arithmetic unit executes a Fourier transform step of performing Fourier transform for an intensity distribution of a Moiré acquired by the detector, and acquiring a spatial frequency spectrum. Also, the arithmetic unit executes a phase retrieval step of separating a spectrum corresponding to a carrier frequency from a spatial frequency spectrum acquired in the Fourier transform step, performing inverse Fourier transform for the separated spectrum, and acquiring a differential phase image. | 11-18-2010 |

20110158493 | ANALYSIS METHOD, RADIATION IMAGING APPARATUS USING ANALYSIS METHOD, AND ANALYSIS PROGRAM FOR EXECUTING ANALYSIS METHOD - An analysis method for use in a radiation imaging apparatus employing intensity information of interference fringes of radiation rays that have passed through a detected object includes the steps of generating first phase information of the detected object wrapped into a range of 2π from the intensity information of the interference fringes; generating information on an absorption intensity gradient of the detected object from the intensity information of the interference fringes; generating a weighting function on the basis of an absolute value of a gradient in the information on the absorption intensity gradient; and generating second phase information by unwrapping the first phase information by using the weighting function. | 06-30-2011 |

20110200168 | IMAGING APPARATUS AND IMAGING METHOD - An imaging apparatus analyzes a periodic pattern of a Moiré due to Talbot interference by the Fourier transform method and forms an image. The imaging apparatus includes a first grating having a structure that transmits light beams from a beam source to refract or diffract the light beams and forms a self image based on a first periodic pattern by the Talbot interference at a predetermined position; a second grating that absorbs part of the first periodic pattern and causes a Moiré to be generated based on a second periodic pattern when the second grating is arranged at a position at which the self image is formed. All cross sections of the Moiré with axes in differential directions of a wavefront for the analysis by the Fourier transform method have a two-dimensional periodic structure in which periods of patterns in the second periodic pattern are the same. | 08-18-2011 |

20110280368 | X-RAY IMAGING APPARATUS, X-RAY IMAGING METHOD, AND X-RAY IMAGING PROGRAM - An X-ray imaging apparatus includes a phase grating, an absorption grating, a detector, and an arithmetic unit. The arithmetic unit executes a Fourier transform step of performing Fourier transform for an intensity distribution of a Moiré acquired by the detector, and acquiring a spatial frequency spectrum. Also, the arithmetic unit executes a phase retrieval step of separating a spectrum corresponding to a carrier frequency from a spatial frequency spectrum acquired in the Fourier transform step, performing inverse Fourier transform for the separated spectrum, and acquiring a differential phase image. | 11-17-2011 |

20120188556 | IMAGING APPARATUS AND IMAGING METHOD - An imaging apparatus includes a diffraction grating configured to produce an interference pattern by diffracting diverging light from a light source, an absorption grating configured to block part of the interference pattern, a detector configured to detect light transmitted through the absorption grating, and a moving unit configured to move the diffraction grating and the absorption grating. The moving unit causes relative movement of the interference pattern and the absorption grating by moving the diffraction grating and the absorption grating such that the diffraction grating and the absorption grating are not moved relative to each other. | 07-26-2012 |

20120294420 | ANALYZING METHOD OF PHASE INFORMATION, ANALYZING PROGRAM OF THE PHASE INFORMATION, STORAGE MEDIUM, AND X-RAY IMAGING APPARATUS - An analyzing method for deriving phase information by analyzing a periodic pattern of moiré comprises steps of: subjecting at least a part of the periodic pattern of moiré to a windowed Fourier transform by a window function; calculating analytically, based on the moiré subjected to the windowed Fourier transform, information of a first spectrum carrying the phase information, and information of a second spectrum superimposed on the information of the first spectrum; and separating the information of the first spectrum from the information of the second spectrum, to derive the phase information. | 11-22-2012 |

20130070893 | X-RAY IMAGING APPARATUS, X-RAY IMAGING METHOD, AND X-RAY IMAGING PROGRAM - An X-ray imaging apparatus includes a phase grating, an absorption grating, a detector, and an arithmetic unit. The arithmetic unit executes a Fourier transform step of performing Fourier transform for an intensity distribution of a Moiré acquired by the detector, and acquiring a spatial frequency spectrum. Also, the arithmetic unit executes a phase retrieval step of separating a spectrum corresponding to a carrier frequency from a spatial frequency spectrum acquired in the Fourier transform step, performing inverse Fourier transform for the separated spectrum, and acquiring a differential phase image. | 03-21-2013 |

20130163717 | IMAGING APPARATUS - An imaging apparatus includes a light source unit; a diffraction grating diffracting light from the light source unit; and a detector detecting light from the diffraction grating, wherein the light source unit includes first light-emitting parts emitting light forming a first interference pattern by being diffracted at the diffraction grating, and second light-emitting parts emitting light forming a second interference pattern by being diffracted at the diffraction grating, wherein the first and the second light-emitting parts are disposed so that at least part of the first and second interference pattern overlap and the positions of light regions in the first interference pattern differ from the positions of light regions in the second interference pattern, and wherein a combined pattern is formed by the first interference pattern and the second interference pattern. | 06-27-2013 |

20130181130 | IMAGING APPARATUS USING TALBOT INTERFERENCE AND ADJUSTING METHOD FOR IMAGING APPARATUS - An imaging apparatus includes a diffraction grating which diffracts electromagnetic waves from an electromagnetic wave source, a shield grating which shields a part of the electromagnetic waves diffracted by the diffraction grating, a detector which detects an intensity distribution of the electromagnetic waves through the shield grating, and an adjusting unit which adjusts the attitude of at least one of the diffraction grating and the shield grating on the basis of the detection result by the detector, wherein the adjusting unit divides the intensity distribution detected by the detector into a plurality of regions and adjusts the attitude of at least one of the diffraction grating and the shield grating on the basis of the intensity distributions of the plurality of regions. | 07-18-2013 |

20130301795 | ANALYSIS METHOD, RADIATION IMAGING APPARATUS USING ANALYSIS METHOD, AND ANALYSIS PROGRAM FOR EXECUTING ANALYSIS METHOD - An analysis method for use in a radiation imaging apparatus employing intensity information of interference fringes of radiation rays that have passed through a detected object includes the steps of generating first phase information of the detected object wrapped into a range of 2π from the intensity information of the interference fringes; generating information on an absorption intensity gradient of the detected object from the intensity information of the interference fringes; generating a weighting function on the basis of an absolute value of a gradient in the information on the absorption intensity gradient; and generating second phase information by unwrapping the first phase information by using the weighting function. | 11-14-2013 |

20130314714 | APPARATUS FOR ACQUIRING INFORMATION OF OBJECT, AND PROGRAM - An apparatus for acquiring information of an object includes an interferometer and an arithmetic unit. The interferometer includes an optical device that forms an interference pattern with light from a light source, and a detector that detects the interference pattern. The arithmetic unit acquires information related to a phase of an object using a first detection result and a second detection result detected by the detector. The arithmetic unit acquires the information related to the phase of the object using information on distribution of changes of the interferometer acquired from the first detection result and the second detection result. | 11-28-2013 |

20140114615 | IMAGING APPARATUS AND PROGRAM AND METHOD FOR ANALYZING INTERFERENCE PATTERN - An imaging apparatus includes a shearing interferometer and a calculation unit configured to calculate information on an object from an interference pattern obtained by the shearing interferometer, wherein the calculation unit solves, as simultaneous equations, three or more equations that express Fourier components at coordinates in a wave number space obtained by performing a windowed Fourier transform on the interference pattern. | 04-24-2014 |

20140241632 | IMAGING APPARATUS AND IMAGE PROCESSING METHOD - Disclosed is an imaging apparatus for generating data of a phase image based on an interference pattern acquired by a shearing interferometer, including: a differential phase data calculating unit that calculates first differential phase data expressing a change of a phase in a first direction and second differential phase data expressing a change of a phase in a second direction, based on interference pattern data generated by an electromagnetic wave transmitted through a subject; a second-order differential phase data calculating unit that calculates first second-order differential phase data by differentiating the first differential phase data in the first direction, and calculates second second-order differential phase data by differentiating the second differential phase data in the second direction; and a phase data calculating unit that calculates the phase image by solving a second-order differential equation including the first and second second-order differential phase data as functions. | 08-28-2014 |