Patents by Inventor Daichi Murakami
Daichi Murakami 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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Publication number: 20240162817Abstract: A signal generation circuit includes: a reference voltage generation circuit configured to generate a reference voltage; a ramp voltage generation circuit configured to generate a ramp voltage that varies within a predetermined voltage range; and a comparison circuit configured to output a comparison result signal that indicates the magnitude relationship between the reference voltage and the ramp voltage. The reference voltage generation circuit gives the reference voltage a waveform of a triangular wave and varies the frequency of the triangular wave.Type: ApplicationFiled: December 21, 2023Publication date: May 16, 2024Inventors: Daichi YURUKI, Kazuhiro MURAKAMI
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Non-oriented electrical steel sheet and method for manufacturing non-oriented electrical steel sheet
Patent number: 11970750Abstract: There is provided a non-oriented electrical steel sheet in which, in a cross section of a base material in a sheet thickness direction, the number density N2-5 of precipitates with an equivalent circle diameter of 50 to 500 nm present in a range of 2.0 to 5.0 ?m from the surface of the base material in the sheet thickness direction is 0.30 pieces/?m2 or less, and the relationship between the number density N2-5 and the number density N0-2 of precipitates with an equivalent circle diameter of 50 to 500 nm present in a range from the surface of the base material to 2.0 ?m satisfies Formula (1): (N2-5)/(N0-2)?0.5??Formula (1).Type: GrantFiled: March 31, 2022Date of Patent: April 30, 2024Assignee: NIPPON STEEL CORPORATIONInventors: Nobusato Morishige, Takeru Ichie, Masato Yasuda, Masahide Urago, Fuminobu Murakami, Daichi Hamada, Atsushi Shibayama, Kazumi Mizukami, Daisuke Itabashi -
Publication number: 20240113558Abstract: A power system supervisory control apparatus, a power system supervisory control system, and a power system supervisory control method for reducing social cost and improving resilience of a power system are provided. The power system supervisory control apparatus including multiple renewable energy power supplies includes: a system influence degree evaluation section that evaluates a system influence degree when a renewable energy fluctuation or an assumed fault has an influence on the power system by using, as computation conditions, system data for obtaining a state of the power system, renewable energy fluctuation data indicative of a fluctuation of a power generation output, and assumed fault data of an assumed fault in the power system, and calculates system influence degree evaluation result data; a computation condition selection index calculation section that calculates a selection index for the computation conditions; and a condition selection section that selects the computation conditions.Type: ApplicationFiled: October 25, 2021Publication date: April 4, 2024Applicant: HITACHI, LTD.Inventors: Daichi Kato, Masahiro Watanabe, Takahisa Matsuzaki, Yohei Murakami
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Patent number: 10690895Abstract: A zoom lens includes in order from an object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power. The first lens unit includes a positive lens, and the second lens unit includes a positive lens, and the following conditional expressions (1), (2), (3), and (4) are satisfied: ?0.015?Tp2G_min_p?0.015??(1), 70.3??d1G_max_p??(2), 1.76?nd2G_max_p?2.3??(3), and 0.3?|f2/f3|?0.9??(4).Type: GrantFiled: September 27, 2017Date of Patent: June 23, 2020Assignee: OLYMPUS CORPORATIONInventors: Toyoki Kon, Kazuteru Kawamura, Yasuharu Yamada, Tetsuya Yanai, Daichi Murakami
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Patent number: 10061106Abstract: A zoom lens includes, in order from the object side, a first lens unit having a positive focal length, a second lens unit having a negative focal length, a third lens unit having a positive focal length, a fourth lens unit having a negative focal length, and a fifth lens unit having a positive focal length, wherein following Conditional Expressions (1) and (2) are satisfied: 0.3?D34W/D45W?1??(1), and 0.2?(D34W/D45W)/(D34T/D45T)?0.6??(2).Type: GrantFiled: November 1, 2016Date of Patent: August 28, 2018Assignee: OLYMPUS CORPORATIONInventors: Tetsuya Yanai, Toyoki Kon, Daichi Murakami, Yuki Kubota
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Publication number: 20180017770Abstract: A zoom lens includes in order from an object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power. The first lens unit includes a positive lens, and the second lens unit includes a positive lens, and the following conditional expressions (1), (2), (3), and (4) are satisfied: ?0.015?Tp2G_min_p?0.015??(1), 70.3??d1G_max_p??(2), 1.76?nd2G_max_p?2.3??(3), and 0.3?|f2/f3|?0.9??(4).Type: ApplicationFiled: September 27, 2017Publication date: January 18, 2018Applicant: OLYMPUS CORPORATIONInventors: Toyoki KON, Kazuteru KAWAMURA, Yasuharu YAMADA, Tetsuya YANAI, Daichi MURAKAMI
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Publication number: 20170123193Abstract: A zoom lens includes, in order from the object side, a first lens unit having a positive focal length, a second lens unit having a negative focal length, a third lens unit having a positive focal length, a fourth lens unit having a negative focal length, and a fifth lens unit having a positive focal length, wherein following Conditional Expressions (1) and (2) are satisfied: 0.3?D34W/D45W?1??(1), and 0.2?(D34W/D45W)/(D34T/D45T)?0.6??(2).Type: ApplicationFiled: November 1, 2016Publication date: May 4, 2017Applicant: OLYMPUS CORPORATIONInventors: Tetsuya YANAI, Toyoki KON, Daichi MURAKAMI, Yuki KUBOTA
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Patent number: 8810713Abstract: An image pickup apparatus includes: an image pickup device that includes a pixel used for focus detection, a plurality of the pixels being arranged in a matrix; a correction memory that stores correction information used for correcting a difference in amounts of received light that depend on pixel positions of the pixels used for focus detection; a correcting section that reads the correction information to correct a pixel value of the pixel used for focus detection; and a focus detecting section that detects a focal point by using the pixel value corrected by the correcting section. Focus accuracy is increased by correcting the pixel value for an AF pixel depending on the pixel position.Type: GrantFiled: July 10, 2012Date of Patent: August 19, 2014Assignees: Olympus Imaging Corp., Olympus CorporationInventors: Keigo Matsuo, Hisashi Goto, Yoshikazu Ichikawa, Ryuhi Okubo, Hiroshi Takase, Toshio Takahashi, Daichi Murakami
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Patent number: 8755125Abstract: A zoom lens unit 1 includes a zoom lens L operable to move a plurality of lens groups in an optical axis direction upon zooming from a wide-angle end to a telephoto end, a first lens group frame 7 for supporting the first lens group G1 positioned on the most object side of the zoom lens L, and a drive 3 operable to move the first lens group frame 7 in a direction vertical to the optical axis.Type: GrantFiled: January 9, 2013Date of Patent: June 17, 2014Assignee: Olympus Imaging Corp.Inventors: Akinori Nishio, Daichi Murakami
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Publication number: 20130242409Abstract: A zoom lens unit 1 includes a zoom lens L operable to move a plurality of lens groups in an optical axis direction upon zooming from a wide-angle end to a telephoto end, a first lens group frame 7 for supporting the first lens group G1 positioned on the most object side of the zoom lens L, and a drive 3 operable to move the first lens group frame 7 in a direction vertical to the optical axis.Type: ApplicationFiled: January 9, 2013Publication date: September 19, 2013Applicant: OLYMPUS IMAGING CORP.Inventors: Akinori Nishio, Daichi Murakami
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Publication number: 20130016274Abstract: An image pickup apparatus includes: an image pickup device that includes a pixel used for focus detection, a plurality of the pixels being arranged in a matrix; a correction memory that stores correction information used for correcting a difference in amounts of received light that depend on pixel positions of the pixels used for focus detection; a correcting section that reads the correction information to correct a pixel value of the pixel used for focus detection; and a focus detecting section that detects a focal point by using the pixel value corrected by the correcting section. Focus accuracy is increased by correcting the pixel value for an AF pixel depending on the pixel position.Type: ApplicationFiled: July 10, 2012Publication date: January 17, 2013Applicants: OLYMPUS CORPORATION, OLYMPUS IMAGING CORP.Inventors: Keigo Matsuo, Hisashi Goto, Yoshikazu Ichikawa, Ryuhi Okubo, Hiroshi Takase, Toshio Takahashi, Daichi Murakami
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Patent number: 7978417Abstract: The invention relates to an eyepiece optical system that, albeit being of small size, works in favor of gaining an angle of field and optical performance, and an electronic view finder incorporating such an eyepiece optical system. Specifically, the invention is characterized by comprising, in order from an object side to an exit side thereof, a first lens group that is a single lens that has positive refracting power and is in a meniscus configuration concave on its object side, a second lens group that is a single lens that has negative refracting power and is in a meniscus configuration concave on its object side, and a third lens group that is a single lens that has positive refracting power, wherein an object-side concave lens surface in the first lens group is an aspheric surface, an object-side concave lens surface in the second lens group is an aspheric surface, and an exit-side lens surface in the third lens group is an aspheric surface.Type: GrantFiled: January 24, 2011Date of Patent: July 12, 2011Assignee: Olympus Imaging Corp.Inventors: Akinori Nishio, Keitaro Yokohama, Daichi Murakami
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Patent number: 7969658Abstract: The invention relates to an eyepiece optical system that, albeit being of small size, works in favor of gaining an angle of field and optical performance, and an electronic view finder incorporating such an eyepiece optical system. Specifically, the invention is characterized by comprising, in order from an object side to an exit side thereof, a first lens group that is a single lens that has positive refracting power and is in a meniscus configuration concave on its object side, a second lens group that is a single lens that has negative refracting power and is in a meniscus configuration concave on its object side, and a third lens group that is a single lens that has positive refracting power, wherein an object-side concave lens surface in the first lens group is an aspheric surface, an object-side concave lens surface in the second lens group is an aspheric surface, and an exit-side lens surface in the third lens group is an aspheric surface.Type: GrantFiled: May 7, 2010Date of Patent: June 28, 2011Assignee: Olympus Imaging Corp.Inventors: Akinori Nishio, Keitaro Yokoyama, Daichi Murakami
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Publication number: 20110122502Abstract: The invention relates to an eyepiece optical system that, albeit being of small size, works in favor of gaining an angle of field and optical performance, and an electronic view finder incorporating such an eyepiece optical system. Specifically, the invention is characterized by comprising, in order from an object side to an exit side thereof, a first lens group that is a single lens that has positive refracting power and is in a meniscus configuration concave on its object side, a second lens group that is a single lens that has negative refracting power and is in a meniscus configuration concave on its object side, and a third lens group that is a single lens that has positive refracting power, wherein an object-side concave lens surface in the first lens group is an aspheric surface, an object-side concave lens surface in the second lens group is an aspheric surface, and an exit-side lens surface in the third lens group is an aspheric surface.Type: ApplicationFiled: January 24, 2011Publication date: May 26, 2011Inventors: Akinori Nishio, Keitaro Yokohama, Daichi Murakami
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Publication number: 20100290129Abstract: The invention relates to an eyepiece optical system that, albeit being of small size, works in favor of gaining an angle of field and optical performance, and an electronic view finder incorporating such an eyepiece optical system. Specifically, the invention is characterized by comprising, in order from an object side to an exit side thereof, a first lens group that is a single lens that has positive refracting power and is in a meniscus configuration concave on its object side, a second lens group that is a single lens that has negative refracting power and is in a meniscus configuration concave on its object side, and a third lens group that is a single lens that has positive refracting power, wherein an object-side concave lens surface in the first lens group is an aspheric surface, an object-side concave lens surface in the second lens group is an aspheric surface, and an exit-side lens surface in the third lens group is an aspheric surface.Type: ApplicationFiled: May 7, 2010Publication date: November 18, 2010Inventors: Akinori Nishio, Keitaro Yokoyama, Daichi Murakami