Patents by Inventor Taeko Toshi

Taeko Toshi 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).

  • Publication number: 20250013006
    Abstract: An optical system comprising, in order from an object side, a first lens group, an aperture stop, and a rear group that includes a first cemented lens comprising a positive lens and a negative lens is configured so as to satisfy the following conditional expressions: 0.350<Bf/y<0.700 1.350<TL/y<2.000 0.050<Np1?Nn1<0.400 where Bf is a back focal length in air; y is maximum image height; TL is the distance from a lens surface closest to the object side to an image plane; and Np1 and Nn1 are the refractive indices of the positive and negative lenses constituting the first cemented lens, respectively.
    Type: Application
    Filed: September 20, 2024
    Publication date: January 9, 2025
    Applicant: NIKON CORPORATION
    Inventors: Ayumu Makida, Taeko Toshi
  • Publication number: 20240210656
    Abstract: An optical system is configured to include, in order from an object side, a first lens group, a stop, and a rear group including at least one cemented lens, and to satisfy all of the following conditional expressions: 0 . 3 ? 5 < Bf / y < 0 .70 1.35 < TL / y < 1.85 where Bf is a back focus in air-equivalent length, and y is a maximum image height. Further, an optical system is configured to include, in order from an object side, a first lens group, a stop, and a rear group having an air gap between a lens disposed closest to an image-plane side of one or more lenses included in the first lens group and the stop, and to satisfy the following conditional expression: 1.35 < TL / y < 1.85 where TL is the distance from a lens surface closest to the object side to an image plane at focusing on an object at infinity, and y is a maximum image height.
    Type: Application
    Filed: May 19, 2022
    Publication date: June 27, 2024
    Inventors: Ayumu MAKIDA, Taeko TOSHI, Tomoki ITO, Keigo KOIDA, Miwako YOSHIDA
  • Patent number: 10281703
    Abstract: Provided is a microscope objective lens that sufficiently corrects on-axis and off-axis chromatic aberrations and that has a long working distance. A microscope objective lens OL includes, in order from an object side, a first lens group G1 with positive refractive power and a second lens group G2 with negative refractive power. The first lens group G1 of the microscope objective lens OL includes a diffractive optical element GD including a diffractive optical surface D, and the diffractive optical element GD is arranged at a position closer to the image than a section where a diameter of a light flux passing through the first lens group G1 is the largest.
    Type: Grant
    Filed: November 13, 2017
    Date of Patent: May 7, 2019
    Assignee: NIKON CORPORATION
    Inventors: Taeko Toshi, Kazuhiro Takasago
  • Publication number: 20180081158
    Abstract: Provided is a microscope objective lens that sufficiently corrects on-axis and off-axis chromatic aberrations and that has a long working distance. A microscope objective lens OL includes, in order from an object side, a first lens group G1 with positive refractive power and a second lens group G2 with negative refractive power. The first lens group G1 of the microscope objective lens OL includes a diffractive optical element GD including a diffractive optical surface D, and the diffractive optical element GD is arranged at a position closer to the image than a section where a diameter of a light flux passing through the first lens group G1 is the largest.
    Type: Application
    Filed: November 13, 2017
    Publication date: March 22, 2018
    Applicant: NIKON CORPORATION
    Inventors: Taeko TOSHI, Kazuhiro TAKASAGO
  • Patent number: 9851546
    Abstract: Provided is a microscope objective lens that sufficiently corrects on-axis and off-axis chromatic aberrations and that has a long working distance. A microscope objective lens OL includes, in order from an object side, a first lens group G1 with positive refractive power and a second lens group G2 with negative refractive power. The first lens group G1 of the microscope objective lens OL includes a diffractive optical element GD including a diffractive optical surface D, and the diffractive optical element GD is arranged at a position closer to the image than a section where a diameter of a light flux passing through the first lens group G1 is the largest.
    Type: Grant
    Filed: April 26, 2016
    Date of Patent: December 26, 2017
    Assignee: NIKON CORPORATION
    Inventors: Taeko Toshi, Kazuhiro Takasago
  • Publication number: 20160238828
    Abstract: Provided is a microscope objective lens that sufficiently corrects on-axis and off-axis chromatic aberrations and that has a long working distance. A microscope objective lens OL includes, in order from an object side, a first lens group G1 with positive refractive power and a second lens group G2 with negative refractive power. The first lens group G1 of the microscope objective lens OL includes a diffractive optical element GD including a diffractive optical surface D, and the diffractive optical element GD is arranged at a position closer to the image than a section where a diameter of a light flux passing through the first lens group G1 is the largest.
    Type: Application
    Filed: April 26, 2016
    Publication date: August 18, 2016
    Applicant: NIKON CORPORATION
    Inventors: Taeko TOSHI, Kazuhiro TAKASAGO
  • Patent number: 9366850
    Abstract: Provided is a microscope objective lens that sufficiently corrects on-axis and off-axis chromatic aberrations and that has a long working distance. A microscope objective lens OL includes, in order from an object side, a first lens group G1 with positive refractive power and a second lens group G2 with negative refractive power. The first lens group G1 of the microscope objective lens OL includes a diffractive optical element GD including a diffractive optical surface D, and the diffractive optical element GD is arranged at a position closer to the image than a section where a diameter of a light flux passing through the first lens group G1 is the largest.
    Type: Grant
    Filed: December 10, 2012
    Date of Patent: June 14, 2016
    Assignee: NIKON CORPORATION
    Inventors: Taeko Toshi, Kazuhiro Takasago