Patents by Inventor Yoshihiro Ohashi
Yoshihiro Ohashi 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).
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Patent number: 9068111Abstract: Provided is a scintillator used for radiation detection in an X-ray CT scanner or the like, the scintillator having a unidirectional phase separation structure having an optical waveguide function, which eliminates the need of formation of banks for preventing crosstalk. The scintillator has a waveguide function instead of the banks or the like. The scintillator includes: a first crystal phase including multiple columnar crystals having unidirectionality; and a second crystal phase for covering a side of the first crystal phase. The first crystal phase includes a perovskite type oxide material including at least one element selected from the group consisting of Lu and Gd, and a rare earth element as an emission center. The first crystal phase emits light by radiation excitation.Type: GrantFiled: July 27, 2012Date of Patent: June 30, 2015Assignee: Canon Kabushiki KaishaInventors: Yoshihiro Ohashi, Nobuhiro Yasui, Toru Den
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Patent number: 8993969Abstract: In a scintillator used for radiation detection, such as an X-ray CT scanner, a scintillation crystal body having a unidirectional phase separation structure is provided which has a light guide function for crosstalk prevention without using partitions. The phase separation structure includes a first crystal phase and a second crystal phase having a refractive index larger than that of the first crystal phase and which have a first principal surface and a second principal surface, these principal surfaces being not located on the same plane, the first principal surface and the second principal surface have portions to which the second crystal phase is exposed, and a portion of the second crystal phase exposed to the first principal surface and a portion of the second crystal phase exposed to the second principal surface are connected to each other.Type: GrantFiled: December 19, 2013Date of Patent: March 31, 2015Assignee: Canon Kabushiki KaishaInventors: Nobuhiro Yasui, Yoshihiro Ohashi, Toru Den, Ryoko Ueyama
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Publication number: 20140319362Abstract: In a scintillator used for radiation detection, such as an X-ray CT scanner, a scintillation crystal body having a unidirectional phase separation structure is provided which has a light guide function for crosstalk prevention without using partitions. The phase separation structure includes a first crystal phase and a second crystal phase having a refractive index larger than that of the first crystal phase and which have a first principal surface and a second principal surface, these principal surfaces being not located on the same plane, the first principal surface and the second principal surface have portions to which the second crystal phase is exposed, and a portion of the second crystal phase exposed to the first principal surface and a portion of the second crystal phase exposed to the second principal surface are connected to each other.Type: ApplicationFiled: December 19, 2013Publication date: October 30, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Nobuhiro Yasui, Yoshihiro Ohashi, Toru Den, Ryoko Horie
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Publication number: 20140110587Abstract: Provided is a scintillator used for radiation detection in an X-ray CT scanner or the like, the scintillator having a unidirectional phase separation structure having an optical waveguide function, which eliminates the need of formation of banks for preventing crosstalk. The scintillator has a waveguide function instead of the banks or the like. The scintillator includes: a first crystal phase including multiple columnar crystals having unidirectionality; and a second crystal phase for covering a side of the first crystal phase. The first crystal phase includes a perovskite type oxide material including at least one element selected from the group consisting of Lu and Gd, and a rare earth element as an emission center. The first crystal phase emits light by radiation excitation.Type: ApplicationFiled: July 27, 2012Publication date: April 24, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Yoshihiro Ohashi, Nobuhiro Yasui, Toru Den
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Publication number: 20140084167Abstract: Provided is a scintillator having a function of waveguiding scintillation light to a photodetector and having a structure for increasing an amount of absorption of radiation. The scintillator has a first surface and a second surface which are not located on a same surface, and includes: a first phase; and a second phase having a refractive index higher than that of the first phase and having a linear attenuation coefficient different from that of the first phase, in which one of the first phase and the second phase includes multiple columnar portions arranged in a direction from the first surface to the second surface, and the multiple columnar portions are stacked in a state in which end faces of the columnar portions are partly offset with respect to each other in a direction parallel to the first surface or the second surface.Type: ApplicationFiled: July 24, 2012Publication date: March 27, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Yoshihiro Ohashi, Nobuhiro Yasui, Toru Den
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Patent number: 8674309Abstract: In a scintillator used for radiation detection, such as an X-ray CT scanner, a scintillation crystal body having a unidirectional phase separation structure is provided which has a light guide function for crosstalk prevention without using partitions. The phase separation structure includes a first crystal phase and a second crystal phase having a refractive index larger than that of the first crystal phase and which have a first principal surface and a second principal surface, these principal surfaces being not located on the same plane, the first principal surface and the second principal surface have portions to which the second crystal phase is exposed, and a portion of the second crystal phase exposed to the first principal surface and a portion of the second crystal phase exposed to the second principal surface are connected to each other.Type: GrantFiled: January 12, 2011Date of Patent: March 18, 2014Assignee: Canon Kabushiki KaishaInventors: Nobuhiro Yasui, Yoshihiro Ohashi, Toru Den, Ryoko Horie
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Patent number: 8669527Abstract: Provided is a scintillator used for detecting radiation in an X-ray CT scanner or the like, the scintillator having a unidirectional phase separation structure having an optical waveguide function, which eliminates the need of formation of partition walls for preventing crosstalks. The scintillator has the phase separation structure including: a first crystal phase including multiple columnar crystals having unidirectionality; and a second crystal phase filling space on the side of the first crystal phase. The second crystal phase includes a material represented by Cs3Cu2[XaY1-a]5, where X and Y are elements which are different from each other and which are selected from the group consisting of I, Br, and Cl, and 0?a?1 is satisfied.Type: GrantFiled: October 8, 2013Date of Patent: March 11, 2014Assignee: Canon Kabushiki KaishaInventors: Ryoko Ueyama, Nobuhiro Yasui, Yoshihiro Ohashi, Toru Den
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Publication number: 20140034839Abstract: Provided is a scintillator used for detecting radiation in an X-ray CT scanner or the like, the scintillator having a unidirectional phase separation structure having an optical waveguide function, which eliminates the need of formation of partition walls for preventing crosstalks. The scintillator has the phase separation structure including: a first crystal phase including multiple columnar crystals having unidirectionality; and a second crystal phase filling space on the side of the first crystal phase. The second crystal phase includes a material represented by Cs3Cu2[XaY1-a]5, where X and Y are elements which are different from each other and which are selected from the group consisting of I, Br, and Cl, and 0?a?1 is satisfied.Type: ApplicationFiled: October 8, 2013Publication date: February 6, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Ryoko Horie, Nobuhiro Yasui, Yoshihiro Ohashi, Toru Den
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Patent number: 8637825Abstract: In a scintillator used for radiation detection, such as an X-ray CT scanner, a scintillation crystal body having a unidirectional phase separation structure is provided which has a light guide function for crosstalk prevention without using partitions. The phase separation structure includes a first crystal phase and a second crystal phase having a refractive index larger than that of the first crystal phase and which have a first principal surface and a second principal surface, these principal surfaces being not located on the same plane, the first principal surface and the second principal surface have portions to which the second crystal phase is exposed, and a portion of the second crystal phase exposed to the first principal surface and a portion of the second crystal phase exposed to the second principal surface are connected to each other.Type: GrantFiled: January 12, 2011Date of Patent: January 28, 2014Assignee: Canon Kabushiki KaishaInventors: Nobuhiro Yasui, Yoshihiro Ohashi, Toru Den, Ryoko Horie
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Patent number: 8624194Abstract: A radiation detecting device is manufactured by a method that includes forming a scintillator layer on a substrate carrying a plurality of photodetectors and a plurality of convex patterns each including a plurality of convexities, the plurality of convex patterns coinciding with the respective photodetectors, the scintillator layer being formed in such a manner as to extend over the plurality of convex patterns; and forming a crack in a portion of the scintillator layer that coincides, in a stacking direction, with a gap between adjacent ones of the convex patterns by cooling the substrate carrying the scintillator layer. The plurality of convex patterns satisfy specific conditions.Type: GrantFiled: April 4, 2012Date of Patent: January 7, 2014Assignee: Canon Kabushiki KaishaInventors: Ryoko Ueyama, Nobuhiro Yasui, Yoshihiro Ohashi, Toru Den
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Patent number: 8618489Abstract: A scintillator crystal to be used for a radiation detector such as X-ray CT apparatus has a unidirectional phase-separated structure and provides a light guiding function without forming partitions to prevent any crosstalk. The scintillator crystal comprises a phase-separated structure including a plurality of first crystal phases of the columnar crystals with unidirectionality and a second crystal phase covering lateral surfaces of the first crystal phases. At least the second crystal phase comprises CuI and emits light when excited by radiation.Type: GrantFiled: March 16, 2012Date of Patent: December 31, 2013Assignee: Canon Kabushiki KaishaInventors: Yoshihiro Ohashi, Nobuhiro Yasui, Toru Den
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Publication number: 20130341512Abstract: A porous scintillator crystal capable of suppressing scattering of light that represents a high spatial resolution is provided. The porous scintillator crystal comprises a porous structure including voids, wherein the porous structure is a phase-separated structure having voids formed therein and comprises materials constituting a eutectic composition of the phase-separated structure and at least one void in the porous structure extend in a direction perpendicular to a principal plane of the porous scintillator crystal.Type: ApplicationFiled: March 22, 2012Publication date: December 26, 2013Applicant: CANON KABUSHIKI KAISHAInventors: Yoshihiro Ohashi, Nobuhiro Yasui, Toru Den
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Patent number: 8586931Abstract: Provided is a scintillator used for detecting radiation in an X-ray CT scanner or the like, the scintillator having a unidirectional phase separation structure having an optical waveguide function, which eliminates the need of formation of partition walls for preventing crosstalks. The scintillator has the phase separation structure including: a first crystal phase including multiple columnar crystals having unidirectionality; and a second crystal phase filling space on the side of the first crystal phase. The second crystal phase includes a material represented by Cs3Cu2[XaY1-a]5, where X and Y are elements which are different from each other and which are selected from the group consisting of I, Br, and Cl, and 0?a?1 is satisfied.Type: GrantFiled: July 3, 2012Date of Patent: November 19, 2013Assignee: Canon Kabushiki KaishaInventors: Ryoko Horie, Nobuhiro Yasui, Yoshihiro Ohashi, Toru Den
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Patent number: 8574955Abstract: Provided is a light-emitting film having controllable resistivity, and a high-luminance light-emitting device, which can be driven at a low voltage, using such light-emitting film. The light-emitting film includes Cu as an addition element in a zinc sulfide compound which is a base material, wherein the zinc sulfide compound includes columnar ZnS crystals, and sites formed of copper sulfide on a grain boundary where the ZnS crystals are in contact with each other.Type: GrantFiled: November 15, 2011Date of Patent: November 5, 2013Assignee: Canon Kabushiki KaishaInventors: Tomoyuki Oike, Tatsuya Iwasaki, Yoshihiro Ohashi
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Patent number: 8506845Abstract: A scintillator material contains a compound represented by a general formula [Cs1-zRbz][I1-x-yBrxCly]:In. In the general formula, x, y, and z satisfy any one of conditions (1), (2), and (3) below. (1) When 0<x+y<1 and z=0, at least one of Mathematical formula 1 and Mathematical formula 2 is satisfied. (2) When 0<x+y<1 and 0<z<1, at least one of Mathematical formula 3 and 0<y<1 is satisfied. (3) When x=y=0, the relationship 0<z<1 is satisfied. The content of indium (In) is 0.00010 mole percent or more and 1.0 mole percent or less relative to [Cs1-zRbz][I1-x-yBrxCly]. [Math. 1] 0<x?0.7??(Math. 1) 0<y?0.8??(Math. 2) 0<x?0.8??(Math.Type: GrantFiled: August 31, 2010Date of Patent: August 13, 2013Assignee: Canon Kabushiki KaishaInventors: Yoshihiro Ohashi, Nobuhiro Yasui, Toru Den
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Publication number: 20130015357Abstract: Provided is a scintillator used for detecting radiation in an X-ray CT scanner or the like, the scintillator having a unidirectional phase separation structure having an optical waveguide function, which eliminates the need of formation of partition walls for preventing crosstalks. The scintillator has the phase separation structure including: a first crystal phase including multiple columnar crystals having unidirectionality; and a second crystal phase filling space on the side of the first crystal phase. The second crystal phase includes a material represented by Cs3Cu2[XaY1-a]5, where X and Y are elements which are different from each other and which are selected from the group consisting of I, Br, and Cl, and 0?a?1 is satisfied.Type: ApplicationFiled: July 3, 2012Publication date: January 17, 2013Applicant: CANON KABUSHIKI KAISHAInventors: Ryoko Horie, Nobuhiro Yasui, Yoshihiro Ohashi, Toru Den
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Publication number: 20120312999Abstract: Provided is a radiation detecting element, including: needle crystal scintillators and a protruding pattern in which: one end of the needle crystal scintillators is in contact with of upper surfaces of the multiple protrusions; a gap corresponding to a gap between the multiple protrusions is provided between portions of the needle crystal scintillators in contact with the upper surfaces of the multiple protrusions; and a number of the needle crystal scintillators in contact with one of the upper surfaces is 5 or less. Conventionally, since the needle crystals exhibit a state of a polycrystalline film in an early stage of vapor deposition, and light also spreads in a horizontal direction, the light received by a photodetector portion and the spatial resolution was lower than ideal values. The present invention enables the deviating region to be the ideal state in an early stage of growth.Type: ApplicationFiled: May 16, 2012Publication date: December 13, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Tomoyuki Oike, Nobuhiro Yasui, Toru Den, Yoshihiro Ohashi, Ryoko Horie
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Publication number: 20120292516Abstract: In a scintillator used for radiation detection, such as an X-ray CT scanner, a scintillation crystal body having a unidirectional phase separation structure is provided which has a light guide function for crosstalk prevention without using partitions. The phase separation structure includes a first crystal phase and a second crystal phase having a refractive index larger than that of the first crystal phase and which have a first principal surface and a second principal surface, these principal surfaces being not located on the same plane, the first principal surface and the second principal surface have portions to which the second crystal phase is exposed, and a portion of the second crystal phase exposed to the first principal surface and a portion of the second crystal phase exposed to the second principal surface are connected to each other.Type: ApplicationFiled: January 12, 2011Publication date: November 22, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Nobuhiro Yasui, Yoshihiro Ohashi, Toru Den, Ryoko Horie
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Publication number: 20120256093Abstract: A radiation detecting device is manufactured by a method that includes forming a scintillator layer on a substrate carrying a plurality of photodetectors and a plurality of convex patterns each including a plurality of convexities, the plurality of convex patterns coinciding with the respective photodetectors, the scintillator layer being formed in such a manner as to extend over the plurality of convex patterns; and forming a crack in a portion of the scintillator layer that coincides, in a stacking direction, with a gap between adjacent ones of the convex patterns by cooling the substrate carrying the scintillator layer. The plurality of convex patterns satisfy specific conditions.Type: ApplicationFiled: April 4, 2012Publication date: October 11, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Ryoko Ueyama, Nobuhiro Yasui, Yoshihiro Ohashi, Toru Den
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Publication number: 20120248317Abstract: A scintillator crystal to be used for a radiation detector such as X-ray CT apparatus has a unidirectional phase-separated structure and provides a light guiding function without forming partitions to prevent any crosstalk. The scintillator crystal comprises a phase-separated structure including a plurality of first crystal phases of the columnar crystals with unidirectionality and a second crystal phase covering lateral surfaces of the first crystal phases. At least the second crystal phase comprises CuI and emits light when excited by radiation.Type: ApplicationFiled: March 16, 2012Publication date: October 4, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Yoshihiro Ohashi, Nobuhiro Yasui, Toru Den