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).
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Publication number: 20240103256Abstract: 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: ApplicationFiled: October 31, 2023Publication date: March 28, 2024Applicant: FUJIFILM CorporationInventors: Daiki KAWAMURA, Michio CHO
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Publication number: 20240077707Abstract: 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: ApplicationFiled: October 27, 2023Publication date: March 7, 2024Applicant: FUJIFILM CorporationInventors: Daiki KAWAMURA, Michio CHO
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Patent number: 11860346Abstract: 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: GrantFiled: June 23, 2021Date of Patent: January 2, 2024Assignee: FUJIFILM CorporationInventors: Kenji Ito, Toshio Sasaki, Masayasu Konishi, Michio Cho
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Patent number: 11841486Abstract: 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: GrantFiled: January 22, 2021Date of Patent: December 12, 2023Assignee: FUJIFILM CorporationInventors: Daiki Kawamura, Michio Cho
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Patent number: 11828923Abstract: 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: GrantFiled: February 3, 2021Date of Patent: November 28, 2023Assignee: FUJIFILM CorporationInventors: Masato Kondo, Tetsuya Ori, Michio Cho
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Publication number: 20230156318Abstract: An imaging apparatus that can display information to be checked by a user at an easily viewed position on a display device of an observation unit is provided. An imaging apparatus according to one embodiment of the present invention includes an imaging element, an observation unit including a display device and an observation optical system, and a processor configured to display a captured image based on an imaging signal read out from the imaging element and related information related to generation of the captured image, on the display device. The processor is configured to display the related information at a first display position and a second display position on the display device during imaging performed by the imaging element. The second display position is present on an inner side of the display device than the first display position. Types of the related information to be displayed at the second display position are set in advance before imaging.Type: ApplicationFiled: January 17, 2023Publication date: May 18, 2023Applicant: FUJIFILM CorporationInventors: Shigeru KONDO, Michio CHO, Shoki KASAHARA
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Publication number: 20220390724Abstract: 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: ApplicationFiled: August 3, 2022Publication date: December 8, 2022Applicant: FUJIFILM CorporationInventors: Taiga NODA, Michio CHO
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Patent number: 11500184Abstract: 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: GrantFiled: August 5, 2020Date of Patent: November 15, 2022Assignee: FUJIFILM CorporationInventors: Takashi Suzuki, Michio Cho
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Patent number: 11454789Abstract: 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: GrantFiled: August 4, 2020Date of Patent: September 27, 2022Assignee: FUJIFILM CorporationInventors: Taiga Noda, Michio Cho
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Patent number: 11353682Abstract: 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: GrantFiled: January 28, 2020Date of Patent: June 7, 2022Assignee: FUJIFILM CorporationInventors: Daiki Kawamura, Michio Cho
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Patent number: 11290634Abstract: 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: GrantFiled: September 21, 2020Date of Patent: March 29, 2022Assignee: FUJIFILM CorporationInventors: Tetsu Wada, Michio Cho, Kensuke Masui
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Patent number: 11221470Abstract: 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: GrantFiled: February 12, 2019Date of Patent: January 11, 2022Assignee: FUJIFILM CorporationInventor: Michio Cho
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Publication number: 20210341709Abstract: 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: ApplicationFiled: July 16, 2021Publication date: November 4, 2021Applicant: FUJIFILM CorporationInventors: Daiki KAWAMURA, Michio CHO
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Publication number: 20210325646Abstract: 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: ApplicationFiled: June 23, 2021Publication date: October 21, 2021Applicant: FUJIFILM CorporationInventors: Kenji ITO, Toshio SASAKI, Masayasu KONISHI, Michio CHO
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Publication number: 20210255442Abstract: 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: ApplicationFiled: February 3, 2021Publication date: August 19, 2021Applicant: FUJIFILM CorporationInventors: Masato KONDO, Tetsuya ORI, Michio CHO
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Patent number: 11095824Abstract: 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: GrantFiled: March 27, 2020Date of Patent: August 17, 2021Assignee: FUJIFILM CorporationInventors: Takeshi Misawa, Michio Cho, Shigeru Kondou, Atsushi Misawa, Shunsuke Miyagishima, Nanae Sakuma
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Patent number: 11079576Abstract: 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: GrantFiled: August 22, 2019Date of Patent: August 3, 2021Assignee: FUJIFILM CorporationInventors: Kenji Ito, Toshio Sasaki, Masayasu Konishi, Michio Cho
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Publication number: 20210231927Abstract: 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: ApplicationFiled: January 22, 2021Publication date: July 29, 2021Applicant: FUJIFILM CorporationInventors: Daiki KAWAMURA, Michio CHO
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Patent number: 10976529Abstract: 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: GrantFiled: September 17, 2018Date of Patent: April 13, 2021Assignee: FUJIFILM CorporationInventors: Yasutaka Shimada, Michio Cho
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Patent number: 10948701Abstract: 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: GrantFiled: February 12, 2019Date of Patent: March 16, 2021Assignee: FUJIFILM CorporationInventor: Michio Cho