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).

  • Zoom lens and imaging apparatus
    Patent number: 9001431
    Abstract: A zoom lens substantially consists of, in order from the object side, a positive first lens group, a negative second lens group, a positive third lens group, a positive fourth lens group, and a negative fifth lens group. When varying magnification, the distances between adjacent lens groups are changed, while all of the lens groups are moved with respect to an image formation position. If ?5T represents the image formation magnification of the fifth lens group when focusing on infinity at the telephoto end, fw represents the focal length of the entire lens system at the wide angle end, and f3 represents the focal length of the third lens group, formula (Ca): ?5.00?1?(?5T)2??3.30 and formula (H): 0.10<fw/f3<0.50 are satisfied.
    Type: Grant
    Filed: December 16, 2013
    Date of Patent: April 7, 2015
    Assignee: Fujifilm Corporation
    Inventors: Takashi Tanaka, Michio Cho
  • IMAGING LENS AND IMAGING DEVICE PROVIDED WITH THE SAME
    Publication number: 20150085385
    Abstract: An imaging lens substantially consists of five lenses consisting of, in order from the object side: a first lens having a positive refractive power and having a meniscus shape with a convex surface toward the object side; a second lens having a biconcave shape; a third lens having a positive refractive power and having a meniscus shape with a convex surface toward the image side; a fourth lens having a meniscus shape with a convex surface toward the image side; and a fifth lens having a negative refractive power and having a concave surface toward the object side.
    Type: Application
    Filed: September 18, 2014
    Publication date: March 26, 2015
    Inventors: Takuya TANAKA, Tatsuro IWASAKI, Michio CHO
  • IMAGING LENS AND IMAGING DEVICE PROVIDED WITH THE SAME
    Publication number: 20150085386
    Abstract: An imaging lens substantially consists of five lenses consisting of, in order from the object side: a first lens having a positive refractive power and having a meniscus shape with the convex surface toward the object side; a second lens having a biconcave shape; a third lens having a positive refractive power and having a meniscus shape with the convex surface toward the image side; a fourth lens having a positive refractive power and having a convex surface toward the image side; and a fifth lens having a negative refractive power, wherein a predetermined conditional expression is satisfied.
    Type: Application
    Filed: September 22, 2014
    Publication date: March 26, 2015
    Inventors: Takuya TANAKA, Tatsuro IWASAKI, Michio CHO
  • IMAGING LENS AND IMAGING DEVICE PROVIDED WITH THE SAME
    Publication number: 20150085381
    Abstract: An imaging lens substantially consists of five lenses consisting of, in order from the object side: a first lens having a positive refractive power and having a meniscus shape with the convex surface toward the object side; a second lens having a biconcave shape; a third lens having a negative refractive power and having a meniscus shape with the convex surface toward the image side; a fourth lens having a positive refractive power; and a fifth lens having a negative refractive power, wherein an image-side surface of the fifth lens includes a concave surface and at least one inflection point, wherein a predetermined conditional expression is satisfied.
    Type: Application
    Filed: September 17, 2014
    Publication date: March 26, 2015
    Inventors: Motoari OTA, Takuya TANAKA, Sumihiro NISHIHATA, Michio CHO
  • Zoom lens and imaging apparatus
    Patent number: 8988784
    Abstract: A zoom lens substantially consists of, in order from the object side, a positive first lens group, a negative second lens group, a positive third lens group, a positive fourth lens group, and a negative fifth lens group. When varying magnification, the distances between adjacent lens groups are changed, while all of the lens groups are moved with respect to an image formation position. When focusing, only the fifth lens group is shifted. The fifth lens group has at least one negative lens and at least one positive lens.
    Type: Grant
    Filed: December 3, 2013
    Date of Patent: March 24, 2015
    Assignee: FUJIFILM Corporation
    Inventors: Takashi Tanaka, Michio Cho
  • IMAGING LENS AND IMAGING APPARATUS EQUIPPED WITH THE IMAGING LENS
    Publication number: 20150077863
    Abstract: An imaging lens is constituted by: a first lens having a positive refractive power and is of a meniscus shape with a convex surface toward the object side; a second lens having a negative refractive power; a third lens having a positive refractive power and a convex surface toward the object side; a fourth lens having a positive refractive power and a convex surface toward the object side; and a fifth lens having a negative refractive power, a concave surface toward the image side on the surface thereof toward the image side in the vicinity of the optical axis, and an inflection point on the surface thereof toward the image side, provided in this order from the object side.
    Type: Application
    Filed: November 19, 2014
    Publication date: March 19, 2015
    Inventors: Yoshikazu SHINOHARA, Kazuya YONEYAMA, Michio CHO
  • IMAGING LENS AND IMAGING APPARATUS EQUIPPED WITH THE IMAGING LENS
    Publication number: 20150077864
    Abstract: An imaging lens is substantially constituted by five lenses, including: a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a negative refractive power; a fourth lens having a negative refractive power; a fifth lens having a negative refractive power and an inflection point on the surface thereof toward the image side. All of the first lens through the fifth lens are single lenses, and the imaging lens satisfies predetermined conditional formulae.
    Type: Application
    Filed: November 20, 2014
    Publication date: March 19, 2015
    Inventors: Takayuki NODA, Michio CHO
  • Imaging lens and imaging apparatus equipped with the imaging lens
    Patent number: 8982478
    Abstract: An imaging lens substantially includes five lenses, constituted by: a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power and a convex surface that faces an object side; a fourth lens having a negative refractive power and a meniscus shape with a concave surface that faces the object side; and a fifth lens having a positive refractive power, a meniscus shape with a convex surface that faces the object side, and at least one inflection point on the surface thereof toward an image side.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: March 17, 2015
    Assignee: FUJIFILM Corporation
    Inventors: Masato Kondo, Michio Cho
  • Imaging lens and imaging apparatus equipped with the imaging lens
    Patent number: 8941928
    Abstract: An imaging lens substantially includes six lenses, constituted by: a first lens having a positive refractive power and a convex surface that faces an object side; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens having a positive refractive power; a fifth lens having a negative refractive power and a concave surface that faces the object side; and an aspherical sixth lens having a negative refractive power, the surface of which is concave toward an image side in the vicinity of an optical axis and convex toward the image side at the peripheral portion thereof. The imaging lens satisfies a predetermined conditional formula.
    Type: Grant
    Filed: March 10, 2014
    Date of Patent: January 27, 2015
    Assignee: FUJIFILM Corporation
    Inventors: Yoshikazu Shinohara, Michio Cho, Sumihiro Nishihata
  • IMAGING LENS AND IMAGING APPARATUS EQUIPPED WITH THE IMAGING LENS
    Publication number: 20150022905
    Abstract: An imaging lens substantially includes six lenses, constituted by: a first lens having a negative refractive power, which is of a meniscus shape having a concave surface toward an image side; a second lens; a third lens; a fourth lens; a fifth lens having a positive refractive power; and a sixth lens having a negative refractive power, a concave surface toward the image side, and at least one inflection point in the surface toward the image side; provided in this order from an object side. The imaging lens satisfies a predetermined conditional formula.
    Type: Application
    Filed: July 21, 2014
    Publication date: January 22, 2015
    Inventors: YOSHIKAZU SHINOHARA, MICHIO CHO
  • ZOOM LENS AND IMAGING APPARATUS
    Publication number: 20150022901
    Abstract: A zoom-lens substantially consists of a positive-first-lens-group, fixed during magnification-change, a negative-second-lens-group, which moves from object-side toward image-side during magnification change from wide-angle-end to telephoto-end, a negative-third-lens-group, which corrects movement of an image-plane during magnification-change, and a positive-fourth-lens-group, which is fixed during magnification-change and includes a stop, in this order from object-side. The first-lens-group substantially consists of a negative-1a-th-lens-group, fixed during focusing, a positive-1b-th-lens-group, which moves during focusing, and a positive-1c-th-lens-group, fixed during focusing, in this order from object-side. The second-lens-group substantially consists of a negative-2a-th-lens-group and a positive-2b-th-lens-group, and a distance therebetween is changed during magnification-change.
    Type: Application
    Filed: October 6, 2014
    Publication date: January 22, 2015
    Inventors: Daiki KOMATSU, Michio CHO
  • Zoom lens and imaging apparatus
    Patent number: 8922904
    Abstract: A zoom lens substantially consists of, in order from the object side, a positive first lens group, a negative second lens group, a positive third lens group, a positive fourth lens group, and a negative fifth lens group. When varying magnification from the wide angle end to the telephoto end, a distance between the first lens group and the second lens group is always increased, a distance between the second lens group and the third lens group is always decreased, a distance between the third lens group and the fourth lens group is always decreased, and a distance between the fourth lens group and the fifth lens group is changed, while all of the lens groups are moved with respect to an image formation position. Formulas (Ca): ?5.00?1?(?5T)2<?2.5 and (D): 0.10<fw/f1<0.25 are satisfied.
    Type: Grant
    Filed: November 29, 2013
    Date of Patent: December 30, 2014
    Assignee: FUJIFILM Corporation
    Inventors: Takashi Tanaka, Michio Cho
  • Zoom lens and imaging apparatus
    Patent number: 8922906
    Abstract: A zoom lens includes a positive first lens group fixed during zooming, a negative second lens moved to the image side upon zooming from the wide angle end to the telephoto end, a negative third lens group for image plane correction during zooming, and a positive fourth lens group fixed during zooming. The first lens group is composed of a negative first lens group front group, a positive first lens group middle group, and a positive first lens group rear group, disposed in order from the object side. The first lens group front group is composed of two negative lenses and one positive lens, disposed in order from the object side. Focusing is performed by moving only the first lens group middle group in an optical axis direction. The zoom lens satisfies a predetermined conditional expression.
    Type: Grant
    Filed: March 18, 2014
    Date of Patent: December 30, 2014
    Assignee: FUJIFILM Corporation
    Inventors: Daiki Komatsu, Michio Cho
  • IMAGING LENS AND IMAGING APPARATUS EQUIPPED WITH THE IMAGING LENS
    Publication number: 20140368931
    Abstract: An imaging lens substantially includes six lenses, constituted by: a first lens having a negative refractive power; a second lens having a positive refractive power; a third lens having a positive refractive power; a fourth lens having a negative refractive power; a fifth lens having a positive refractive power; and a sixth lens having a negative refractive power, a concave surface toward an image side, and at least one inflection point in the surface toward the image side; provided in this order from an object side. The imaging lens satisfies a predetermined conditional formula.
    Type: Application
    Filed: June 10, 2014
    Publication date: December 18, 2014
    Inventors: Takayuki NODA, Michio CHO
  • IMAGING LENS AND IMAGING APPARATUS INCLUDING THE SAME
    Publication number: 20140362455
    Abstract: The imaging lens substantially consists of a front group having positive refractive power, an aperture stop, a rear group having positive refractive power in this order from the object side. The front group substantially consists of a lens having a negative meniscus shape with a convex surface toward the object side, a negative lens, and a positive lens in this order from the object side. The rear group substantially consists of a positive lens, a negative lens, a positive lens, and a positive lens in this order from the object side. In the case that the Abbe numbers with respect to the d-line of the first lens and the second lens from the object side in the front group are respectively ?1 and ?2, conditional expressions (1) and (2) below are satisfied: 10.0<?2??1??(1) 40<?2??(2).
    Type: Application
    Filed: August 22, 2014
    Publication date: December 11, 2014
    Inventors: Ping SUN, Katsuhisa TSUTSUMI, Kazunori ONO, Michio CHO
  • Real-image variable-magnification viewfinder and imaging apparatus
    Patent number: 8896927
    Abstract: A real-image variable-magnification viewfinder substantially consists of, in order from the object side: an objective lens system substantially consisting of a positive first lens, a negative second lens, a positive third lens, and a positive fourth lens; an erect optical system formed by a plurality of optical members; and a positive eyepiece lens system. The first lens and the third lens are fixed relative to the optical axis direction during magnification change, and the second lens and the fourth lens are moved in the optical axis direction during magnification change. All optical surfaces of all the optical members forming the erect optical system are planar surfaces. At least one of the optical members forming the erect optical system is made of a glass material. A predetermined conditional expression is satisfied.
    Type: Grant
    Filed: January 23, 2014
    Date of Patent: November 25, 2014
    Assignee: FUJIFILM Corporation
    Inventors: Hiroki Saito, Michio Cho
  • IMAGING LENS AND IMAGING APPARATUS
    Publication number: 20140340764
    Abstract: An imaging lens includes: a positive first lens group; a positive second lens group which moves while focusing; and a third lens group. The first lens group includes a positive lens having a convex surface with a radius of curvature having a small absolute value toward the image side, a positive biconvex lens, a negative lens having a concave surface with a radius of curvature having a small absolute value toward the object side, and a positive lens having a convex surface with a radius of curvature having a small absolute value toward the object side, in this order from the object side. The second lens group includes a positive lens having a convex surface with a radius of curvature having a small absolute value toward the object side. The third lens group includes two positive lenses and one negative lens. The imaging lens satisfies a predetermined conditional formula.
    Type: Application
    Filed: August 4, 2014
    Publication date: November 20, 2014
    Inventors: UKYO TOMIOKA, MICHIO CHO
  • SUPER WIDE ANGLE LENS AND IMAGING APPARATUS USING IT
    Publication number: 20140340769
    Abstract: A super wide angle lens substantially consists of a positive first lens group in which a positive first lens, a negative second lens, a negative third lens, a negative fourth lens, a positive fifth lens, a sixth lens unit that is a cemented lens, a seventh lens, an aperture stop, and an eighth lens unit that is a cemented lens are arranged in this order from an object side, a second lens group in which a first lens unit that is a positive single lens or a cemented lens and a second lens unit that is a cemented lens are arranged in this order from the object side, and a third lens group including a positive lens. The super wide angle lens is structured in such a manner to satisfy conditional formula (1): 0.8<(T16+T17)/f<2.5.
    Type: Application
    Filed: August 6, 2014
    Publication date: November 20, 2014
    Inventors: Yasutaka SHIMADA, Michio CHO
  • WIDE ANGLE LENS AND IMAGING APPARATUS
    Publication number: 20140340563
    Abstract: A wide angle lens includes: a positive first lens group, a second lens group, constituted by two or fewer lenses, that moves during focusing operations, and a third lens group that includes at least one positive lens, provided in this order from the object side. The first lens group includes at least a positive meniscus lens with a convex surface toward the object side, a negative meniscus lens with a convex surface toward the object side, a lens having a concave surface with a radius of curvature having a smaller absolute value toward the image side, a negative lens, a cemented lens formed by a positive lens and a negative lens, and an aperture stop provided adjacent to the cemented lens toward the image side thereof, provided in this order from the object side. The wide angle lens satisfies a predetermined conditional formula.
    Type: Application
    Filed: August 5, 2014
    Publication date: November 20, 2014
    Inventors: Hiroshi YAMADA, Michio CHO
  • IMAGING LENS AND IMAGING APPARATUS
    Publication number: 20140334011
    Abstract: An imaging lens includes: a first lens group having a positive refractive power which is fixed during focusing operations; a second lens group having a positive refractive power which moves during focusing operations; and a third lens group which is fixed during focusing operations. The first lens group includes a 1a lens group having a positive refractive power, an aperture stop, and a 1b lens group having a positive refractive power. The 1a lens group includes a positive lens, a negative meniscus lens, a negative meniscus lens, a positive meniscus lens, a negative lens, a positive lens, a negative lens, and a cemented lens formed by a positive lens and a negative lens.
    Type: Application
    Filed: July 30, 2014
    Publication date: November 13, 2014
    Inventors: Ukyo TOMIOKA, Michio CHO