Patents by Inventor Miho Matsumoto
Miho Matsumoto 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: 10921583Abstract: An ocular optical system (EL) comprises, in order from an eye point (EP), a first lens group (G1) having a positive refractive power and a second lens group (G2) having a positive refractive power. The second lens group (G2) includes a cemented lens having two optical members cemented together. A cemented surface of the cemented lens is a diffraction optical surface configuring a diffraction grating. A lens surface on one side in a lens constituting the first lens group (G1) is a first Fresnel surface (FSa), and a lens surface on one side in the cemented lens of the second lens group (G2) is a second Fresnel surface (FSb).Type: GrantFiled: November 6, 2018Date of Patent: February 16, 2021Assignee: NIKON CORPORATIONInventors: Miho Matsumoto, Atsushi Sekine, Hidetsugu Takagi
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Patent number: 10585225Abstract: A transparent film includes: a base material; and at least one scratch resistant layer of which indentation hardness is 300 MPa or greater and of which a thickness is 50 to 1,000 nm on an outermost surface of the transparent film at one side or both sides of the base material, and a number of times of folding endurance of the transparent film measured by an MIT testing machine according to JIS P8115 (2001) is 1,000 times or greater.Type: GrantFiled: October 6, 2017Date of Patent: March 10, 2020Assignee: FUJIFILM CorporationInventors: Miho Asahi, Ayako Matsumoto, Shuntaro Ibuki, Shinya Watanabe, Hajime Nakayama, Naoya Shibata
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Publication number: 20200040423Abstract: A non-oriented electrical steel sheet includes, as a chemical composition, by mass %: C: 0.0015% to 0.0040%; Si: 3.5% to 4.5%; Al: 0.65% or less; Mn: 0.2% to 2.0%; Sn: 0% to 0.20%; Sb: 0% to 0.20%; P: 0.005% to 0.150%; S: 0.0001% to 0.0030%; Ti: 0.0030% or less; Nb: 0.0050% or less; Zr: 0.0030% or less; Mo: 0.030% or less; V: 0.0030% or less; N: 0.0010% to 0.0030%; O: 0.0010% to 0.0500%; Cu: less than 0.10%; Ni: less than 0.50%; and a remainder including Fe and impurities, in which a product sheet thickness is 0.10 mm to 0.30 mm, an average grain size is 10 ?m to 40 ?m, an iron loss W10/800 is 50 W/Kg or less, a tensile strength is 580 MPa to 700 MPa, and a yield ratio is 0.82 or more.Type: ApplicationFiled: July 19, 2018Publication date: February 6, 2020Applicant: NIPPON STEEL CORPORATIONInventors: Yoshiaki NATORI, Kazutoshi TAKEDA, Hiroyoshi YASHIKI, Miho TOMITA, Hiroshi FUJIMURA, Takeaki WAKISAKA, Tesshu MURAKAWA, Takuya MATSUMOTO, Hiroki HORI, Yuuya GOHMOTO, O UYAMA
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Patent number: 10488633Abstract: An imaging lens (PL) has an image surface (I) curved to have a concave surface facing an object and comprises, in order from the object along the optical axis (Ax): a first lens (L1) having positive refractive power; a second lens (L2) having negative refractive power; a third lens (L3) having positive refractive power; a fourth lens (L4) having positive or negative refractive power; and a fifth lens (L5) having at least one lens surface formed as an aspherical surface and having negative refractive power. The following conditional expression is satisfied: 0.005<f/|f4|<0.5 where, f denotes a focal length of the imaging lens (PL), and f4 denotes a focal length of the fourth lens (L4).Type: GrantFiled: June 24, 2017Date of Patent: November 26, 2019Assignee: Nikon CorporationInventor: Miho Matsumoto
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Patent number: 10399309Abstract: An antireflection film includes: a substrate; and an antireflection layer formed with a composition containing metal oxide particles having surface hydroxyl groups as particles for forming a moth eye structure, and two compounds having (meth)acryloyl groups, where the antireflection layer contains a binder resin including at least one of a structure derived from the two (meth)acryloyl groups, and the moth eye structure has an irregular shape formed with the metal oxide particles on a surface on a side opposite to an interface on the substrate side, and in the irregular shape of the antireflection layer, B/A is a ratio between a distance A between peaks of adjacent convex portions and a distance B between a center between peaks of the adjacent convex portions and a concave portion is 0.5 or greater.Type: GrantFiled: September 29, 2016Date of Patent: September 3, 2019Assignee: FUJIFILM CorporationInventors: Miho Asahi, Ayako Matsumoto, Shuntaro Ibuki, Makoto Uchimura
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Patent number: 10338276Abstract: There is provided an antireflective film, including: a plastic substrate; a infiltration layer; and an antireflective layer containing metallic oxide fine particles with an average primary particle diameter of 50 nm to 250 nm and a viscosity increasing compound, in this order, wherein the infiltration layer contains a polymer of a (meth)acrylate compound having a molecular weight of 400 or less, and the antireflective layer has a moth-eye structure including an uneven shape formed by the metallic oxide fine particles.Type: GrantFiled: September 11, 2015Date of Patent: July 2, 2019Assignee: FUJIFILM CORPORATIONInventors: Miho Asahi, Kazuo Kamohara, Shuntaro Ibuki, Ayako Matsumoto, Daiki Wakizaka
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Publication number: 20190072763Abstract: An ocular optical system (EL) comprises, in order from an eye point (EP), a first lens group (G1) having a positive refractive power and a second lens group (G2) having a positive refractive power. The second lens group (G2) includes a cemented lens having two optical members cemented together. A cemented surface of the cemented lens is a diffraction optical surface configuring a diffraction grating. A lens surface on one side in a lens constituting the first lens group (G1) is a first Fresnel surface (FSa), and a lens surface on one side in the cemented lens of the second lens group (G2) is a second Fresnel surface (FSb).Type: ApplicationFiled: November 6, 2018Publication date: March 7, 2019Applicant: NIKON CORPORATIONInventors: Miho MATSUMOTO, Atsushi SEKINE, Hidetsugu TAKAGI
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Patent number: 9869879Abstract: An objective lens (OL) according to the present invention comprises, in order from an object side, a first lens group (G1) having positive refractive power, and a second lens group (G2) having negative refractive power. The first lens group (G1) comprises a positive meniscus lens (L1) having a concave surface facing the object side, a positive lens (L2) dispose close to an image of the positive meniscus lens (L1), and a diffractive optical element (DOE) having a diffractive optical surface (D). The second lens group (G2) is composed of three cemented lenses (CL21 to CL23) which are configured with a positive lens and a negative lens cemented each other. When d00 denotes a distance from the object side to the positive meniscus lens (L1), and TL0 denotes a distance from the object side to the objective lens rear end surface, 0.11?d00/TL0?0.19 is satisfied.Type: GrantFiled: January 9, 2015Date of Patent: January 16, 2018Assignee: Nikon CorporationInventors: Miho Matsumoto, Kotaro Yamaguchi
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Publication number: 20170293116Abstract: An imaging lens (PL) has an image surface (I) curved to have a concave surface facing an object and comprises, in order from the object along the optical axis (Ax): a first lens (L1) having positive refractive power; a second lens (L2) having negative refractive power; a third lens (L3) having positive refractive power; a fourth lens (L4) having positive or negative refractive power; and a fifth lens (L5) having at least one lens surface formed as an aspherical surface and having negative refractive power. The following conditional expression is satisfied: 0.005<f/|f4|<0.5 where, f denotes a focal length of the imaging lens (PL), and f4 denotes a focal length of the fourth lens (L4).Type: ApplicationFiled: June 24, 2017Publication date: October 12, 2017Inventor: Miho MATSUMOTO
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Patent number: 9625733Abstract: A zoom optical system has, in order from an object: a first lens group G1 having positive refractive power; a second lens group G2 having negative refractive power; a third lens group G3 having positive refractive power; and a fourth lens group G4 having negative refractive power, wherein the mutual distance between the lens groups G1 to G4 change upon zooming, and one of the third lens group G3 and the fourth lens group G4 includes at least one diffractive optical element PF.Type: GrantFiled: March 14, 2012Date of Patent: April 18, 2017Assignee: Nikon CorporationInventor: Miho Matsumoto
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Patent number: 9535240Abstract: Provided is a zoom optical system which includes, in order from an object, a first lens group having negative refractive power and other lens groups, and in which an interval between each lens group changes upon zooming, wherein the first lens group includes a first negative lens which is disposed closest to the object and has a diffractive optical element on an image side lens surface, and a positive lens disposed closer to the image than the first negative lens, and the glass material used for the positive lens satisfies the following conditions expressions: ?1p?35 and ?(?g, F)?0.Type: GrantFiled: May 30, 2014Date of Patent: January 3, 2017Assignee: Nikon CorporationInventors: Yoshikazu Hirayama, Miho Matsumoto
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Publication number: 20160334634Abstract: An objective lens (OL) according to the present invention comprises, in order from an object side, a first lens group (G1) having positive refractive power, and a second lens group (G2) having negative refractive power. The first lens group (G1) comprises a positive meniscus lens (L1) having a concave surface facing the object side, a positive lens (L2) dispose close to an image of the positive meniscus lens (L1), and a diffractive optical element (DOE) having a diffractive optical surface (D). The second lens group (G2) is composed of three cemented lenses (CL21 to CL23) which are configured with a positive lens and a negative lens cemented each other. When d00 denotes a distance from the object side to the positive meniscus lens (L1), and TL0 denotes a distance from the object side to the objective lens rear end surface, 0.11?d00/TL0?0.19 is satisfied.Type: ApplicationFiled: January 9, 2015Publication date: November 17, 2016Inventors: Miho MATSUMOTO, Kotaro YAMAGUCHI
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Patent number: 9395525Abstract: A catadioptric imaging lens includes: a first reflecting mirror; a second reflecting mirror; and a lens group. A reflecting surface of the first reflecting mirror is a rotationally asymmetrical aspherical, with concavity on the object side within the reference and the first orthogonal plane. A reflecting surface of the second reflecting mirror is a rotationally asymmetrical aspherical, with convexity toward the first reflecting mirror within the reference and within the second orthogonal plane. A surface in the lens group closest to the second reflecting mirror is a rotationally asymmetrical aspherical, with concavity toward the second reflecting mirror within the reference plane and convexity toward the second reflecting mirror within the third orthogonal plane.Type: GrantFiled: December 30, 2013Date of Patent: July 19, 2016Assignee: Nikon CorporationInventors: Miho Matsumoto, Yoshikazu Hirayama, Kinya Kato, Yoshikazu Sugiyama
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Patent number: 9097887Abstract: A telescope optical system having an objective lens system and an eyepiece lens system; wherein: the objective lens system includes a multi-layer-type diffractive optical element (PFo), and cemented lenses (So1) provided with a lens having positive refractive power and a lens having negative refractive power; the eyepiece lens system includes a multi-layer-type diffractive optical element (PFe), and cemented lenses (Se1) provided with a lens having negative refractive power and a lens having positive refractive power; and the condition represented by: 2?|(Po/FNO)/{Pe/(?×m)}|?15 is satisfied, where Ko represents the power of the objective lens system, Kodoe represents the power of the diffractive optical element (PFo) of the objective lens system, and Po is defined as Po=Kodoe/Ko; Ke represents the power of the eyepiece lens system, Kedoe represents the power of the diffractive optical element (PFe) of the eyepiece lens system, and Pe is defined as Pe=Kedoe/Ke; and FNO represents the F-number of the objectiveType: GrantFiled: May 10, 2011Date of Patent: August 4, 2015Assignee: Nikon CorporationInventor: Miho Matsumoto
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Publication number: 20140268363Abstract: Provided is a zoom optical system which includes, in order from an object, a first lens group having negative refractive power and other lens groups, and in which an interval between each lens group changes upon zooming, wherein the first lens group includes a first negative lens which is disposed closest to the object and has a diffractive optical element on an image side lens surface, and a positive lens disposed closer to the image than the first negative lens, and the glass material used for the positive lens satisfies the following conditions expressions: ?1p?35 and ?(?g, F)?0.Type: ApplicationFiled: May 30, 2014Publication date: September 18, 2014Applicant: Nikon CorporationInventors: Yoshikazu Hirayama, Miho Matsumoto
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Patent number: 8797649Abstract: An achromatic lens system is provided with a cemented resin lens having positive refractive power constructed by a resin lens L11 having positive refractive power cemented with a resin lens L12 having negative refractive power, and a close-contact multi-layer type diffractive optical element L11E, the diffractive optical element L11E being disposed to an image side of the cemented resin lens, the diffractive optical element L11E being constructed by cementing two diffractive element members DE11, DE12 each made of different optical materials with each other, and the cemented surface thereof being a diffractive optical surface Gf on which grooves of a diffraction grating are formed, there by being lightweight and easily manufactured, capable of excellently correcting chromatic aberration and spherical aberration at the same time.Type: GrantFiled: March 3, 2011Date of Patent: August 5, 2014Assignee: Nikon Vision Co., Ltd.Inventors: Miho Matsumoto, Akiko Miyakawa, Toshihiko Kurata
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Publication number: 20140211330Abstract: A catadioptric imaging lens includes: a first reflecting mirror; a second reflecting mirror; and a lens group. A reflecting surface of the first reflecting mirror is a rotationally asymmetrical aspherical, with concavity on the object side within the reference and the first orthogonal plane. A reflecting surface of the second reflecting mirror is a rotationally asymmetrical aspherical, with convexity toward the first reflecting mirror within the reference and within the second orthogonal plane. A surface in the lens group closest to the second reflecting mirror is a rotationally asymmetrical aspherical, with concavity toward the second reflecting mirror within the reference plane and convexity toward the second reflecting mirror within the third orthogonal plane.Type: ApplicationFiled: December 30, 2013Publication date: July 31, 2014Inventors: Miho Matsumoto, Yoshikazu Hirayama, Kinya Kato, Yoshikazu Sugiyama
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Publication number: 20140204462Abstract: A zoom optical system has, in order from an object: a first lens group G1 having positive refractive power; a second lens group G2 having negative refractive power; a third lens group G3 having positive refractive power; and a fourth lens group G4 having negative refractive power, wherein the mutual distance between the lens groups G1 to G4 change upon zooming, and one of the third lens group G3 and the fourth lens group G4 includes at least one diffractive optical element PF.Type: ApplicationFiled: March 14, 2012Publication date: July 24, 2014Inventor: Miho Matsumoto
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Publication number: 20130063812Abstract: A telescope optical system having an objective lens system and an eyepiece lens system; wherein: the objective lens system includes a multi-layer-type diffractive optical element (PFo), and cemented lenses (So1) provided with a lens having positive refractive power and a lens having negative refractive power; the eyepiece lens system includes a multi-layer-type diffractive optical element (PFe), and cemented lenses (Se1) provided with a lens having negative refractive power and a lens having positive refractive power; and the condition represented by: 2?|(Po/FNO)/{Pe/(?×m)}|?15 is satisfied, where Ko represents the power of the objective lens system, Kodoe represents the power of the diffractive optical element (PFo) of the objective lens system, and Po is defined as Po=Kodoe/Ko; Ke represents the power of the eyepiece lens system, Kedoe represents the power of the diffractive optical element (PFe) of the eyepiece lens system, and Pe is defined as Pe=Kedoe/Ke; and FNO represents the F-number of the objectiveType: ApplicationFiled: May 10, 2011Publication date: March 14, 2013Inventor: Miho Matsumoto
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Patent number: 8004778Abstract: An achromatic lens system is provided with a cemented resin lens having positive refractive power constructed by a resin lens L11 having positive refractive power cemented with a resin lens L12 having negative refractive power, and a close-contact multi-layer type diffractive optical element L11E, the diffractive optical element L11E being disposed to an image side of the cemented resin lens, the diffractive optical element L11E being constructed by cementing two diffractive element members DE11, DE12 each made of different optical materials with each other, and the cemented surface thereof being a diffractive optical surface Gf on which grooves of a diffraction grating are formed, there by being lightweight and easily manufactured, capable of excellently correcting chromatic aberration and spherical aberration at the same time.Type: GrantFiled: August 11, 2009Date of Patent: August 23, 2011Assignee: Nikon Vision Co., Ltd.Inventors: Miho Matsumoto, Akiko Miyakawa, Toshihiko Kurata