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).

  • Patent number: 10921583
    Abstract: 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: Grant
    Filed: November 6, 2018
    Date of Patent: February 16, 2021
    Assignee: NIKON CORPORATION
    Inventors: Miho Matsumoto, Atsushi Sekine, Hidetsugu Takagi
  • Patent number: 10585225
    Abstract: 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: Grant
    Filed: October 6, 2017
    Date of Patent: March 10, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Miho Asahi, Ayako Matsumoto, Shuntaro Ibuki, Shinya Watanabe, Hajime Nakayama, Naoya Shibata
  • Publication number: 20200040423
    Abstract: 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: Application
    Filed: July 19, 2018
    Publication date: February 6, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Yoshiaki NATORI, Kazutoshi TAKEDA, Hiroyoshi YASHIKI, Miho TOMITA, Hiroshi FUJIMURA, Takeaki WAKISAKA, Tesshu MURAKAWA, Takuya MATSUMOTO, Hiroki HORI, Yuuya GOHMOTO, O UYAMA
  • Patent number: 10488633
    Abstract: 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: Grant
    Filed: June 24, 2017
    Date of Patent: November 26, 2019
    Assignee: Nikon Corporation
    Inventor: Miho Matsumoto
  • Patent number: 10399309
    Abstract: 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: Grant
    Filed: September 29, 2016
    Date of Patent: September 3, 2019
    Assignee: FUJIFILM Corporation
    Inventors: Miho Asahi, Ayako Matsumoto, Shuntaro Ibuki, Makoto Uchimura
  • Patent number: 10338276
    Abstract: 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: Grant
    Filed: September 11, 2015
    Date of Patent: July 2, 2019
    Assignee: FUJIFILM CORPORATION
    Inventors: Miho Asahi, Kazuo Kamohara, Shuntaro Ibuki, Ayako Matsumoto, Daiki Wakizaka
  • Publication number: 20190072763
    Abstract: 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: Application
    Filed: November 6, 2018
    Publication date: March 7, 2019
    Applicant: NIKON CORPORATION
    Inventors: Miho MATSUMOTO, Atsushi SEKINE, Hidetsugu TAKAGI
  • Patent number: 9869879
    Abstract: 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: Grant
    Filed: January 9, 2015
    Date of Patent: January 16, 2018
    Assignee: Nikon Corporation
    Inventors: Miho Matsumoto, Kotaro Yamaguchi
  • Publication number: 20170293116
    Abstract: 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: Application
    Filed: June 24, 2017
    Publication date: October 12, 2017
    Inventor: Miho MATSUMOTO
  • Patent number: 9625733
    Abstract: 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: Grant
    Filed: March 14, 2012
    Date of Patent: April 18, 2017
    Assignee: Nikon Corporation
    Inventor: Miho Matsumoto
  • Patent number: 9535240
    Abstract: 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: Grant
    Filed: May 30, 2014
    Date of Patent: January 3, 2017
    Assignee: Nikon Corporation
    Inventors: Yoshikazu Hirayama, Miho Matsumoto
  • Publication number: 20160334634
    Abstract: 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: Application
    Filed: January 9, 2015
    Publication date: November 17, 2016
    Inventors: Miho MATSUMOTO, Kotaro YAMAGUCHI
  • Patent number: 9395525
    Abstract: 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: Grant
    Filed: December 30, 2013
    Date of Patent: July 19, 2016
    Assignee: Nikon Corporation
    Inventors: Miho Matsumoto, Yoshikazu Hirayama, Kinya Kato, Yoshikazu Sugiyama
  • Patent number: 9097887
    Abstract: 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 objective
    Type: Grant
    Filed: May 10, 2011
    Date of Patent: August 4, 2015
    Assignee: Nikon Corporation
    Inventor: Miho Matsumoto
  • Publication number: 20140268363
    Abstract: 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: Application
    Filed: May 30, 2014
    Publication date: September 18, 2014
    Applicant: Nikon Corporation
    Inventors: Yoshikazu Hirayama, Miho Matsumoto
  • Patent number: 8797649
    Abstract: 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: Grant
    Filed: March 3, 2011
    Date of Patent: August 5, 2014
    Assignee: Nikon Vision Co., Ltd.
    Inventors: Miho Matsumoto, Akiko Miyakawa, Toshihiko Kurata
  • Publication number: 20140211330
    Abstract: 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: Application
    Filed: December 30, 2013
    Publication date: July 31, 2014
    Inventors: Miho Matsumoto, Yoshikazu Hirayama, Kinya Kato, Yoshikazu Sugiyama
  • Publication number: 20140204462
    Abstract: 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: Application
    Filed: March 14, 2012
    Publication date: July 24, 2014
    Inventor: Miho Matsumoto
  • Publication number: 20130063812
    Abstract: 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 objective
    Type: Application
    Filed: May 10, 2011
    Publication date: March 14, 2013
    Inventor: Miho Matsumoto
  • Patent number: 8004778
    Abstract: 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: Grant
    Filed: August 11, 2009
    Date of Patent: August 23, 2011
    Assignee: Nikon Vision Co., Ltd.
    Inventors: Miho Matsumoto, Akiko Miyakawa, Toshihiko Kurata