Patents by Inventor Shinichi Mihara

Shinichi Mihara 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: 20210255440
    Abstract: A wide-angle optical system is a wide-angle optical system having a lens component, and includes in order from an object side, a first lens unit having a negative refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power. At the time of carrying out a focal-position adjustment from a far point to a near point, the second lens unit is moved from a first position toward a second position. The third lens unit includes not less than three lens components. Not less than three lens components include a first lens component and a second lens component. Each of the first lens component and the second lens component has a positive refractive power, and following conditional expression (1) is satisfied: 0.8<f3L12/fL<6.0??(1).
    Type: Application
    Filed: March 2, 2021
    Publication date: August 19, 2021
    Applicant: OLYMPUS CORPORATION
    Inventors: Keisuke ICHIKAWA, Takashi FUJIKURA, Shinichi MIHARA, Yoshihiro UCHIDA
  • Publication number: 20210255439
    Abstract: A wide-angle optical system includes a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a positive refractive power. At the time of carrying out a focal-position adjustment, the second lens unit is moved. The third lens unit includes a positive single lens on an image side of a cemented surface Sc having a negative refractive power nearest to an image in the third lens unit, and has a plurality of refractive surfaces having a negative refractive power on the object side of the cemented surface Sc. The third lens unit has at least one refractive surface Sp having a positive refractive power which satisfies following conditional expression (1): 0.02<fL/Rsp<1.20??(1).
    Type: Application
    Filed: March 2, 2021
    Publication date: August 19, 2021
    Applicant: OLYMPUS CORPORATION
    Inventors: Takashi FUJIKURA, Keisuke ICHIKAWA, Shinichi MIHARA
  • Publication number: 20210239950
    Abstract: A wide-angle optical system includes in order from an object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third unit having a positive refractive power. At the time of carrying out a focal-position adjustment from a far point to a near point, the second lens unit is moved from a first position toward a second position. The third lens unit includes not less than three lens components, and not less than three lens components include a first lens component and a second lens component. The first lens component is a single lens and the second lens component is a cemented lens. Following conditional expression (1) is satisfied: ?0.60<(n2C??n2C)/r2C<?0.05??(1).
    Type: Application
    Filed: February 25, 2021
    Publication date: August 5, 2021
    Applicant: OLYMPUS CORPORATION
    Inventors: Keisuke ICHIKAWA, Takashi FUJIKURA, Shinichi MIHARA
  • Publication number: 20210181488
    Abstract: A wide-angle optical system is a wide-angle optical system having a lens component. The lens component has a plurality of optical surfaces, in the lens component, two optical surfaces are in contact with air, and at least one optical surface is a curved surface. The wide-angle optical system includes in order from an object side, a first lens unit having a negative refractive power, a second lens unit, and a third lens unit having a positive refractive power. The second lens unit, for a focal-position adjustment, is moved between a first position and a second position along an optical axis. The third lens unit includes a cemented lens having a positive refractive power and a cemented lens having a negative refractive power, and following conditional expression (1) is satisfied: 0.05<fL/R31F<1.0 ??(1).
    Type: Application
    Filed: March 3, 2021
    Publication date: June 17, 2021
    Applicant: OLYMPUS CORPORATION
    Inventors: Takashi FUJIKURA, Keisuke ICHIKAWA, Shinichi MIHARA
  • Patent number: 10830991
    Abstract: A single-focus optical system includes a front lens unit and a rear lens unit. The front lens unit either includes a predetermined sub lens unit or includes an enlargement-side sub lens unit and a predetermined sub lens unit. The rear lens unit includes a first sub lens unit, a second sub lens unit, a third sub lens unit, and a fourth sub lens unit. The enlargement-side sub lens unit includes a negative lens component. The predetermined sub lens unit includes an enlargement-side meniscus lens component and a reduction-side meniscus lens component. The first sub lens unit includes positive lenses and a first predetermined negative lens. The second sub lens unit includes a predetermined negative lens component. The third sub lens unit includes a predetermined positive lens component. The fourth sub lens unit includes all lens components positioned on the reduction side of the predetermined positive lens component.
    Type: Grant
    Filed: September 29, 2018
    Date of Patent: November 10, 2020
    Assignee: OLYMPUS CORPORATION
    Inventors: Keisuke Ichikawa, Shinichi Mihara
  • Patent number: 10663705
    Abstract: A single-focus optical system includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power. The first lens unit includes either a first sub unit, a second sub unit, and a third sub unit, or one positive lens component in addition to the first sub unit, the second sub unit, and the third sub unit. The first sub-unit includes one negative lens component or a plurality of negative lens components, the second sub-unit includes two meniscus lens components, and the third sub-unit includes a plurality of positive lens components. The third lens unit includes a front side sub-unit and a rear side sub-unit. The front side sub-unit includes only a positive lens component.
    Type: Grant
    Filed: July 3, 2018
    Date of Patent: May 26, 2020
    Assignee: OLYMPUS CORPORATION
    Inventors: Keisuke Ichikawa, Shinichi Mihara
  • Patent number: 10551617
    Abstract: An image pickup apparatus includes an image forming optical system having an aperture stop, a first lens, and a second lens, and an imager having a light-receiving surface that is curved to be concave toward the image forming optical system, and a relative partial dispersion for a medium of the first lens differs from a relative partial dispersion for a medium of the second lens, and when a straight line indicated by ?gFLA=?×?dLA+?LA (where ?=?0.00163) has been set, ?gFLA and ?dLA for the medium of the first lens are included in both of an area determined by the following conditional expression (1) and an area determined by the following conditional expression (2), and the following conditional expression (3) is satisfied: 0.68<?LA??(1), ?dLA<50??(2), and 0<|f/Rimg|?1.5??(3).
    Type: Grant
    Filed: March 8, 2017
    Date of Patent: February 4, 2020
    Assignee: OLYMPUS CORPORATION
    Inventors: Takahiro Amanai, Ayami Imamura, Shinichi Mihara
  • Patent number: 10274705
    Abstract: A single-focus optical system includes in order from an enlargement side, a first lens unit, and a second lens unit having a positive refractive power. A lens component is one of a single lens and a cemented lens. The first lens unit includes a reduction-side negative lens component closest to the reduction side, and in addition, the first lens unit includes not less than three negative lens components including the reduction-side negative lens component. The second lens unit includes in order from the enlargement side, a front side sub-unit and a rear side sub-unit. The front side sub-unit includes only a positive lens component, and the rear side sub-unit includes at least a negative lens.
    Type: Grant
    Filed: November 1, 2017
    Date of Patent: April 30, 2019
    Assignee: OLYMPUS CORPORATION
    Inventors: Keisuke Ichikawa, Shinichi Mihara
  • Patent number: 10197768
    Abstract: A single-focus optical system includes a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a positive refractive power. The first lens unit includes a reduction-side lens component closest to the reduction side, and a shape of the reduction-side lens component is a meniscus shape having a convex surface directed toward the enlargement side. The second lens unit includes a cemented lens of a meniscus shape having a convex surface directed toward the reduction side, and a plurality of positive lens components. The cemented lens in the second lens unit includes a negative lens and a positive lens. The third lens unit includes a negative lens component closest to the enlargement side. All air spaces in the first lens unit and in the second lens unit are constant at the time of focusing.
    Type: Grant
    Filed: November 1, 2017
    Date of Patent: February 5, 2019
    Assignee: OLYMPUS CORPORATION
    Inventors: Keisuke Ichikawa, Shinichi Mihara
  • Patent number: 10197769
    Abstract: A single-focus optical system includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power. The first lens unit includes at least a first sub-unit, a second sub-unit, and a third sub-unit. The first sub-unit includes one of, a one negative lens component and a plurality of negative lens components that are continuous, the second sub-unit includes two meniscus lens components having respective concave surfaces thereof facing mutually, and the third sub-unit includes a plurality of positive lens components disposed closest to the reduction side in the third sub unit. The second lens unit includes one negative lens component. The third lens unit includes negative lens, and also includes a positive lens component closest to the enlargement side. All air spaces in the first lens unit are constant.
    Type: Grant
    Filed: November 9, 2017
    Date of Patent: February 5, 2019
    Assignee: OLYMPUS CORPORATION
    Inventors: Keisuke Ichikawa, Shinichi Mihara
  • Publication number: 20190033563
    Abstract: A single-focus optical system includes a front lens unit and a rear lens unit. The front lens unit either includes a predetermined sub lens unit or includes an enlargement-side sub lens unit and a predetermined sub lens unit. The rear lens unit includes a first sub lens unit, a second sub lens unit, a third sub lens unit, and a fourth sub lens unit. The enlargement-side sub lens unit includes a negative lens component. The predetermined sub lens unit includes an enlargement-side meniscus lens component and a reduction-side meniscus lens component. The first sub lens unit includes positive lenses and a first predetermined negative lens. The second sub lens unit includes a predetermined negative lens component. The third sub lens unit includes a predetermined positive lens component. The fourth sub lens unit includes all lens components positioned on the reduction side of the predetermined positive lens component.
    Type: Application
    Filed: September 29, 2018
    Publication date: January 31, 2019
    Applicant: OLYMPUS CORPORATION
    Inventors: Keisuke ICHIKAWA, Shinichi MIHARA
  • Patent number: 10191258
    Abstract: A single-focus optical system includes in order from an enlargement side, a first lens unit, and a second lens unit having a positive refractive power. A lens component is one of a single lens and a cemented lens. The first lens unit includes a reduction-side negative lens component closest to the reduction side, and in addition, the first lens unit includes not less than three negative lens components including the reduction-side negative lens component. The second lens unit includes in order from the enlargement side, a first positive lens, a second positive lens, a first negative lens, and a third positive lens, and all airspaces in the second lens unit are constant at a time of focusing.
    Type: Grant
    Filed: November 1, 2017
    Date of Patent: January 29, 2019
    Assignee: OLYMPUS CORPORATION
    Inventors: Keisuke Ichikawa, Shinichi Mihara
  • Patent number: 10191253
    Abstract: A single-focus optical system includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power. The first lens unit includes at least a first sub-unit, a second sub-unit, and a third sub-unit. The first sub-unit includes a negative lens component, the second sub-unit includes two meniscus lens components, and the third sub-unit includes a plurality of positive lens components. The third lens unit includes a front side sub-unit and a rear side sub-unit, and the front side sub-unit includes only a positive lens component. At the time of focusing, the first lens unit is fixed, the second lens unit is movable, and the rear side sub-unit is fixed.
    Type: Grant
    Filed: November 1, 2017
    Date of Patent: January 29, 2019
    Assignee: OLYMPUS CORPRATION
    Inventors: Keisuke Ichikawa, Shinichi Mihara
  • Publication number: 20180314043
    Abstract: A single-focus optical system includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power. The first lens unit includes either a first sub unit, a second sub unit, and a third sub unit, or one positive lens component in addition to the first sub unit, the second sub unit, and the third sub unit. The first sub-unit includes one negative lens component or a plurality of negative lens components, the second sub-unit includes two meniscus lens components, and the third sub-unit includes a plurality of positive lens components. The third lens unit includes a front side sub-unit and a rear side sub-unit. The front side sub-unit includes only a positive lens component.
    Type: Application
    Filed: July 3, 2018
    Publication date: November 1, 2018
    Applicant: OLYMPUS CORPORATION
    Inventors: Keisuke ICHIKAWA, Shinichi MIHARA
  • Patent number: 10031322
    Abstract: The invention relates to an electronic image pickup system whose depth dimension is extremely reduced, taking advantage of an optical system type that can overcome conditions imposed on the movement of a zooming movable lens group while high specifications and performance are kept. The electronic image pickup system comprises an optical path-bending zoom optical system comprising, in order from its object side, a 1-1st lens group G1-1 comprising a negative lens group and a reflecting optical element P for bending an optical path, a 1-2nd lens group G1-2 comprising one positive lens and a second lens group G2 having positive refracting power. For zooming from the wide-angle end to the telephoto end, the second lens group G2 moves only toward the object side. The electronic image pickup system also comprises an electronic image pickup device I located on the image side of the zoom optical system.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: July 24, 2018
    Assignee: OLYMPUS CORPORATION
    Inventors: Shinichi Mihara, Hirokazu Konishi, Toyoharu Hanzawa, Masahito Watanabe, Atsujiro Ishii, Tetsuhide Takeyama, Ayami Imamura
  • Publication number: 20180074289
    Abstract: A single-focus optical system includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power. The first lens unit includes at least a first sub-unit, a second sub-unit, and a third sub-unit. The first sub-unit includes one of, a one negative lens component and a plurality of negative lens components that are continuous, the second sub-unit includes two meniscus lens components having respective concave surfaces thereof facing mutually, and the third sub-unit includes a plurality of positive lens components disposed closest to the reduction side in the third sub unit. The second lens unit includes one negative lens component. The third lens unit includes negative lens, and also includes a positive lens component closest to the enlargement side. All air spaces in the first lens unit are constant.
    Type: Application
    Filed: November 9, 2017
    Publication date: March 15, 2018
    Applicant: OLYMPUS CORPORATION
    Inventors: Keisuke ICHIKAWA, Shinichi MIHARA
  • Publication number: 20180067281
    Abstract: A single-focus optical system includes in order from an enlargement side, a first lens unit, and a second lens unit having a positive refractive power. A lens component is one of a single lens and a cemented lens. The first lens unit includes a reduction-side negative lens component closest to the reduction side, and in addition, the first lens unit includes not less than three negative lens components including the reduction-side negative lens component. The second lens unit includes in order from the enlargement side, a front side sub-unit and a rear side sub-unit. The front side sub-unit includes only a positive lens component, and the rear side sub-unit includes at least a negative lens.
    Type: Application
    Filed: November 1, 2017
    Publication date: March 8, 2018
    Applicant: OLYMPUS CORPORATION
    Inventors: Keisuke ICHIKAWA, Shinichi MIHARA
  • Publication number: 20180067282
    Abstract: A single-focus optical system includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power. The first lens unit includes at least a first sub-unit, a second sub-unit, and a third sub-unit. The first sub-unit includes a negative lens component, the second sub-unit includes two meniscus lens components, and the third sub-unit includes a plurality of positive lens components. The third lens unit includes a front side sub-unit and a rear side sub-unit, and the front side sub-unit includes only a positive lens component. At the time of focusing, the first lens unit is fixed, the second lens unit is movable, and the rear side sub-unit is fixed.
    Type: Application
    Filed: November 1, 2017
    Publication date: March 8, 2018
    Applicant: OLYMPUS CORPORATION
    Inventors: Keisuke ICHIKAWA, Shinichi MIHARA
  • Publication number: 20180052310
    Abstract: A single-focus optical system includes in order from an enlargement side, a first lens unit, and a second lens unit having a positive refractive power. A lens component is one of a single lens and a cemented lens. The first lens unit includes a reduction-side negative lens component closest to the reduction side, and in addition, the first lens unit includes not less than three negative lens components including the reduction-side negative lens component. The second lens unit includes in order from the enlargement side, a first positive lens, a second positive lens, a first negative lens, and a third positive lens, and all airspaces in the second lens unit are constant at a time of focusing.
    Type: Application
    Filed: November 1, 2017
    Publication date: February 22, 2018
    Applicant: OLYMPUS CORPORATION
    Inventors: Keisuke ICHIKAWA, Shinichi MIHARA
  • Publication number: 20180052300
    Abstract: A single-focus optical system includes a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a positive refractive power. The first lens unit includes a reduction-side lens component closest to the reduction side, and a shape of the reduction-side lens component is a meniscus shape having a convex surface directed toward the enlargement side. The second lens unit includes a cemented lens of a meniscus shape having a convex surface directed toward the reduction side, and a plurality of positive lens components. The cemented lens in the second lens unit includes a negative lens and a positive lens. The third lens unit includes a negative lens component closest to the enlargement side. All air spaces in the first lens unit and in the second lens unit are constant at the time of focusing.
    Type: Application
    Filed: November 1, 2017
    Publication date: February 22, 2018
    Applicant: OLYMPUS CORPORATION
    Inventors: Keisuke ICHIKAWA, Shinichi MIHARA