Patents by Inventor Michio Cho

Michio Cho 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: 20210341709
    Abstract: An imaging lens includes, successively in order from a position closest to an object side, a positive first lens group that does not move during focusing, a stop, and a positive second lens group that moves during focusing. The second lens group consists of all lenses that integrally move during focusing. The imaging lens satisfies predetermined conditional expressions.
    Type: Application
    Filed: July 16, 2021
    Publication date: November 4, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Daiki KAWAMURA, Michio CHO
  • Publication number: 20210325646
    Abstract: A lens 1 has unevenness within an optical effective diameter D of an optical surface 2, an arithmetic mean roughness Ra within the optical effective diameter D of the optical surface 2 is 20 nm or more and 50 nm or less, and an average value of widths W of protrusion portions 3 of the unevenness on an average line C2 of a roughness curve C1 of the optical surface 2 is 1/200 or more and 1/50 or less of the optical effective diameter D of the optical surface 2. The lens 1 is suitably used as a lens that composes a zoom lens or an imaging lens.
    Type: Application
    Filed: June 23, 2021
    Publication date: October 21, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Kenji ITO, Toshio SASAKI, Masayasu KONISHI, Michio CHO
  • Publication number: 20210255442
    Abstract: An imaging lens consists of, in order from the object side, a first lens group, a stop, a positive second lens group, and a third lens group. During focusing, at least the second lens group moves and the third lens group does not move. The second lens group includes at least two negative lenses. The third lens group consists of one negative lens and one positive lens.
    Type: Application
    Filed: February 3, 2021
    Publication date: August 19, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Masato KONDO, Tetsuya ORI, Michio CHO
  • Patent number: 11095824
    Abstract: A finder display unit displays a live view image based on a captured image generated by an imaging unit. A digital signal processing unit detects a movement vector between frames in the live view image for a predetermined portion in the captured image. A digital signal processing unit changes a display range of the live view image on the finder display unit based on the detected movement vector of a peripheral portion in the captured image.
    Type: Grant
    Filed: March 27, 2020
    Date of Patent: August 17, 2021
    Assignee: FUJIFILM Corporation
    Inventors: Takeshi Misawa, Michio Cho, Shigeru Kondou, Atsushi Misawa, Shunsuke Miyagishima, Nanae Sakuma
  • Patent number: 11079576
    Abstract: There are provided a lens, a zoom lens, and an imaging lens capable of eliminating blurriness of a ring zone without reducing resolution and increasing the number of steps of processing. A lens 1 has random unevenness within an optical effective diameter D of an optical surface 2, an arithmetic mean roughness Ra within the optical effective diameter D of the optical surface 2 is 20 nm or more and 50 nm or less, and an average value of widths W of protrusion portions 3 of the unevenness on an average line C2 of a roughness curve C1 of the optical surface 2 is 1/200 or more and 1/50 or less of the optical effective diameter D of the optical surface 2. The lens 1 is suitably used as a lens that composes a zoom lens or an imaging lens.
    Type: Grant
    Filed: August 22, 2019
    Date of Patent: August 3, 2021
    Assignee: FUJIFILM Corporation
    Inventors: Kenji Ito, Toshio Sasaki, Masayasu Konishi, Michio Cho
  • Publication number: 20210231927
    Abstract: An imaging lens includes a positive first lens group and a second lens group, which are continuous in order from the position closest to the object side, as lens groups. During focusing, the distance between the first lens group and the second lens group changes. A stop is disposed closer to the image side than a lens which is second from the object side. A combined refractive power of all lenses closer to the object side than the stop is positive. The imaging lens includes an LA positive lens and an LB positive lens that satisfy a predetermined conditional expression at a position closer to the object side than the stop. An Abbe number of the LB positive lens is the maximum among Abbe numbers of all positive lenses closer to the object side than the stop.
    Type: Application
    Filed: January 22, 2021
    Publication date: July 29, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Daiki KAWAMURA, Michio CHO
  • Patent number: 10976529
    Abstract: The variable magnification optical system includes, in order from an object side, a positive first lens group disposed at a position closest to the object side, a variable magnification lens group which is disposed at a position closest to the object side among negative lens groups and moves during changing magnification, an intermediate group including at least one lens group, and a positive final lens group which is disposed at a position closest to the image side. The variable magnification lens group, the intermediate group, and the final lens group are continuously disposed. The variable magnification optical system includes at least one LA lens. This LA lens satisfies predetermined conditional expressions relating to a refractive index, an Abbe number, and a partial dispersion ratio, and is located from the variable magnification lens group to the intermediate group.
    Type: Grant
    Filed: September 17, 2018
    Date of Patent: April 13, 2021
    Assignee: FUJIFILM Corporation
    Inventors: Yasutaka Shimada, Michio Cho
  • Patent number: 10948701
    Abstract: A variable magnification optical system consists of, in order from an object side, a first optical system remaining stationary during changing magnification and a second optical system including a plurality of lens groups moving during changing magnification. The first optical system includes a first mirror and a second mirror having reflective surfaces arranged to face each other. The first mirror has a reflective surface concave toward the object side. The second mirror has a reflective surface convex toward the image side. An intermediate image is formed between the second mirror and the second optical system. Predetermined conditional expressions relating to the partial dispersion ratios of the lenses included in the second optical system are satisfied.
    Type: Grant
    Filed: February 12, 2019
    Date of Patent: March 16, 2021
    Assignee: FUJIFILM Corporation
    Inventor: Michio Cho
  • Publication number: 20210048652
    Abstract: The imaging lens consists of, in order from the object side, a first positive lens group, a stop, a second positive lens group, and a third negative lens group. The first lens group includes a negative lens which has a concave surface on the image side, and two positive lenses which are disposed to be closer to the image side than the negative lens and which have respective convex surfaces on the object side, convex surfaces on the object side. The second lens group includes an aspheric lens, and two sets of cemented lenses disposed to be closer to the image side than the aspheric lens. The third lens group consists of one lens component.
    Type: Application
    Filed: August 5, 2020
    Publication date: February 18, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Takashi SUZUKI, Michio CHO
  • Publication number: 20210048651
    Abstract: A zoom lens includes a positive first lens group, a negative second lens group, a positive third lens group, a positive fourth lens group, and a fifth lens group in order from an object side. In a case of zooming, an interval with an adjacent lens group is changed. The third lens group includes two positive lenses consecutively arranged in order from a side closest to the object side to an image side. The fifth lens group consists of a negative meniscus lens having a concave surface toward the object side and a positive lens having a convex surface toward the object side in order from the object side to the image side.
    Type: Application
    Filed: August 4, 2020
    Publication date: February 18, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Taiga NODA, Michio CHO
  • Publication number: 20210006708
    Abstract: Provided are an imaging apparatus, an imaging method, and a program that can directly determine a sensor position at which an image with good image quality is obtained from obtained image information. The imaging apparatus moves an image sensor to a plurality of sensor positions in the optical axis direction of an imaging lens, and focuses a subject at each of the plurality of sensor positions. Image data of the subject focused at each of the plurality of sensor positions is acquired, and the image data is analyzed to calculate an image evaluation value at each of the plurality of sensor positions.
    Type: Application
    Filed: September 21, 2020
    Publication date: January 7, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Tetsu WADA, Michio CHO, Kensuke MASUI
  • Patent number: 10795162
    Abstract: The image displayable eyeglasses include: a first transmissive optical element 13 that transmits an image of a subject and is capable of changing a refractive power; and a second transmissive optical element 13 that displays or reflects an image using an image signal and transmits the image of the subject. The image displayable eyeglasses are capable of switching between an image display mode, in which the image is displayed or reflected by the second transmissive optical element 12 so as to be incident on eyes of a wearer of the eyeglass body, and an eyeglass mode, in which the image of the subject transmitted through the first transmissive optical element 12 and the second transmissive optical element 13 is incident on the eyes of the wearer. The first transmissive optical element 12 is disposed closer to the wearer than the second transmissive optical element 13.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: October 6, 2020
    Assignee: FUJIFILM Corporation
    Inventor: Michio Cho
  • Publication number: 20200249430
    Abstract: The imaging lens comprises, successively in order from the object side, a positive first lens group that does not move during focusing, a second lens group that moves during focusing, a stop, and a positive third lens group that consists of all lenses moving integrally with the second lens group during focusing. The composite focal length of the second lens group and the third lens group is positive. The first lens group includes four or more positive lenses and three or more negative lenses. The imaging lens satisfies predetermined conditional expressions.
    Type: Application
    Filed: January 28, 2020
    Publication date: August 6, 2020
    Applicant: FUJIFILM Corporation
    Inventors: Daiki KAWAMURA, Michio CHO
  • Publication number: 20200228726
    Abstract: A finder display unit displays a live view image based on a captured image generated by an imaging unit. A digital signal processing unit detects a movement vector between frames in the live view image for a predetermined portion in the captured image. A digital signal processing unit changes a display range of the live view image on the finder display unit based on the detected movement vector of a peripheral portion in the captured image.
    Type: Application
    Filed: March 27, 2020
    Publication date: July 16, 2020
    Applicant: FUJIFILM Corporation
    Inventors: Takeshi MISAWA, Michio CHO, Shigeru KONDOU, Atsushi MISAWA, Shunsuke MIYAGISHIMA, Nanae SAKUMA
  • Publication number: 20190377167
    Abstract: There are provided a lens, a zoom lens, and an imaging lens capable of eliminating blurriness of a ring zone without reducing resolution and increasing the number of steps of processing. A lens 1 has random unevenness within an optical effective diameter D of an optical surface 2, an arithmetic mean roughness Ra within the optical effective diameter D of the optical surface 2 is 20 nm or more and 50 nm or less, and an average value of widths W of protrusion portions 3 of the unevenness on an average line C2 of a roughness curve C1 of the optical surface 2 is 1/200 or more and 1/50 or less of the optical effective diameter D of the optical surface 2. The lens 1 is suitably used as a lens that composes a zoom lens or an imaging lens.
    Type: Application
    Filed: August 22, 2019
    Publication date: December 12, 2019
    Applicant: FUJIFILM Corporation
    Inventors: Kenji ITO, Toshio SASAKI, Masayasu KONISHI, Michio CHO
  • Patent number: 10437016
    Abstract: The imaging lens includes, in order from the object side, a first lens group that remains stationary during focusing; a diaphragm; and a positive second lens group that moves to the object side during focusing from a long range to a close range. The first lens group includes, in order from the object side: a negative meniscus lens that has an absolute value of a radius of curvature of an image side surface smaller than that of an object side surface, a negative lens, a positive lens, and a negative lens. The second lens group includes five or less lenses, and includes: a positive Z lens that is formed continuously in order from a most image side; a negative Y lens that has an absolute value of a radius of curvature of an object side surface smaller than that of an image side surface; and a positive X lens.
    Type: Grant
    Filed: January 23, 2017
    Date of Patent: October 8, 2019
    Assignee: FUJIFILM Corporation
    Inventors: Takashi Kunugise, Kazuyoshi Okada, Michio Cho
  • Patent number: 10401593
    Abstract: The imaging lens includes, in order from the object side, a first lens group that remains stationary during focusing; a diaphragm; and a positive second lens group that moves to the object side during focusing from a long range to a close range. The second lens group includes a positive Z lens that is formed continuously in order from a most image side, a negative Y lens that has an absolute value of a radius of curvature of an object side surface smaller than an absolute value of a radius of curvature of an image side surface, a positive X lens, and a negative W lens that has an absolute value of a radius of curvature of an image side surface smaller than that of an object side surface. The imaging lens satisfies a conditional expression about of the radii of curvature of the X lens and the W lens.
    Type: Grant
    Filed: January 23, 2017
    Date of Patent: September 3, 2019
    Assignee: FUJIFILM Corporation
    Inventors: Toshihiro Aoi, Takashi Kunugise, Kazuyoshi Okada, Michio Cho
  • Publication number: 20190265449
    Abstract: A variable magnification optical system consists of, in order from an object side, a first optical system remaining stationary during changing magnification and a second optical system including a plurality of lens groups moving during changing magnification. The first optical system includes a first mirror and a second mirror having reflective surfaces arranged to face each other. The first mirror has a reflective surface concave toward the object side. The second mirror has a reflective surface convex toward the image side. An intermediate image is formed between the second mirror and the second optical system. Predetermined conditional expressions relating to the partial dispersion ratios of the lenses included in the second optical system are satisfied.
    Type: Application
    Filed: February 12, 2019
    Publication date: August 29, 2019
    Applicant: FUJIFILM Corporation
    Inventor: Michio CHO
  • Publication number: 20190265446
    Abstract: A variable magnification optical system consists of, in order from an object side, a first optical system remaining stationary during changing magnification and a second optical system including a plurality of lens groups moving during changing magnification. The first optical system includes a first mirror and a second mirror having reflective surfaces arranged to face each other. The first mirror is an optical element having a power at a position closest to the object side on an optical path and has a reflective surface concave toward the object side. The second mirror has a reflective surface convex toward the image side. An intermediate image is formed between the second mirror and the second optical system.
    Type: Application
    Filed: February 12, 2019
    Publication date: August 29, 2019
    Applicant: FUJIFILM Corporation
    Inventor: Michio CHO
  • Publication number: 20190113758
    Abstract: The image displayable eyeglasses include: a first transmissive optical element 13 that transmits an image of a subject and is capable of changing a refractive power; and a second transmissive optical element 13 that displays or reflects an image using an image signal and transmits the image of the subject. The image displayable eyeglasses are capable of switching between an image display mode, in which the image is displayed or reflected by the second transmissive optical element 12 so as to be incident on eyes of a wearer of the eyeglass body, and an eyeglass mode, in which the image of the subject transmitted through the first transmissive optical element 12 and the second transmissive optical element 13 is incident on the eyes of the wearer. The first transmissive optical element 12 is disposed closer to the wearer than the second transmissive optical element 13.
    Type: Application
    Filed: December 13, 2018
    Publication date: April 18, 2019
    Applicant: FUJIFILM Corporation
    Inventor: Michio CHO