First Component Negative Patents (Class 359/781)
  • Patent number: 10185129
    Abstract: A telecentric lens including a first lens group, an aperture stop, and a second lens group arranged in order from a magnified side to a minified side is provided. The first lens group has an outmost lens facing the magnified side, and the second lens group has an outmost lens facing the minified side. At least one of the outmost lens of the first lens group and the outmost lens of the second lens group is formed of glass. At least one of the first lens group and the second lens group has a lens having negative refractive power and being composed of plurality of lenses being mutually contacted to each other. The condition: TTL<100 mm is satisfied, wherein TTL denotes a length measured along an optical axis and between two outmost opposite lens surfaces of the telecentric lens.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: January 22, 2019
    Assignee: Young Optics Inc.
    Inventors: Hung-You Cheng, Kai-Yun Chen, Yu-Hung Chou
  • Patent number: 9891410
    Abstract: An imaging lens includes a first lens having negative refractive power; a second lens having positive refractive power; a third lens having positive refractive power; and a fourth lens, arranged in this order from an object side to an image plane side. The second lens is arranged to face the third lens. The first lens has a focal length f1 and the fourth lens has an Abbe's number ?d4 so that the specific conditional expressions are satisfied.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: February 13, 2018
    Assignees: OPTICAL LOGIC INC., KANTATSU CO., LTD.
    Inventors: Yoji Kubota, Kenichi Kubota, Hitoshi Hirano, Tomohiro Yonezawa
  • Patent number: 9432557
    Abstract: An imaging lens includes first to fourth lens elements arranged from an object side to an image side in the given order. Through designs of surfaces of the lens elements and relevant lens parameters, a short system length of the imaging lens may be achieved while maintaining good optical performance.
    Type: Grant
    Filed: May 16, 2014
    Date of Patent: August 30, 2016
    Assignee: Genius Electronic Optical Co., Ltd.
    Inventors: Kai-Lun Wang, Ta-Cheng Fan, Jin-Hui Gong
  • Patent number: 9244255
    Abstract: A miniature image pickup lens includes a first lens, a second lens, an aperture, a third lens, a fourth lens, and a fifth lens in sequence along an optical axis from an object side to an image side. The first lens is a negative meniscus lens with a convex aspheric surface toward the object side and a concave aspheric surface toward the image side. The second lens has both aspheric surfaces including a convex surface toward the object side. The third lens is a positive biconvex lens. The fourth lens is a positive biconvex lens. The fifth lens is a negative lens with a concave surface toward the object side.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: January 26, 2016
    Assignee: KINKO OPTICAL CO., LTD.
    Inventors: Sze-Ying Chen, Yi-Fang Chen
  • Patent number: 9052495
    Abstract: Provided is a zoom lens in which a variation in aberration with respect to a temperature change is small and excellent optical characteristics can be easily obtained. The zoom lens includes multiple lens units in which a distance between adjacent ones of the multiple lens units changes for zooming. When an average value of a change in refractive index with respect to a temperature change within a temperature range of from 0° C. to 40° C. is ?Nav, at least one lens unit L of the multiple lens units includes multiple optical elements A made of materials satisfying a conditional expression: |?Nav|>5.0×10?5. When an anomalous partial dispersion ratio for a g-line and an F-line is ??gF??, at least one optical element A? of the multiple optical elements A satisfies a conditional expression: |??gF??|>0.0272.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: June 9, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yoshiaki Ida
  • Patent number: 9042039
    Abstract: An imaging lens includes negative first lens, negative second lens, third lens of a plano-convex shape having a convex surface directed toward an object side or of a positive meniscus shape having a convex surface directed toward the object side, and a fourth lens of a plano-convex shape having a convex surface directed toward an image side or of a positive meniscus shape having a convex surface directed toward the image side, which are arranged in this order from the object side. Further, the following conditional formula (6) is satisfied: 0.75?(R8?R9)/(R8+R9)?1.0??(6), where R8: a curvature radius of an object-side surface of the fourth lens, and R9: a curvature radius of an image-side surface of the fourth lens.
    Type: Grant
    Filed: October 28, 2013
    Date of Patent: May 26, 2015
    Assignee: FUJIFILM CORPORATION
    Inventor: Taro Asami
  • Patent number: 9036278
    Abstract: An imaging lens consists of a negative first lens, a negative second lens, a third lens of a plano-convex shape having a convex surface directed toward an object side or of a positive meniscus shape having a convex surface directed toward the object side, and a fourth lens of a plano-convex shape having a convex surface directed toward an image side or of a positive meniscus shape having a convex surface directed toward the image side, which are arranged in this order from the object side. Further, the following conditional formula (1) is satisfied: 2.25<?d2/?d3??(1), where ?d2: an Abbe number of a material of the second lens for d-line, and ?d3: an Abbe number of a material of the third lens for d-line.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: May 19, 2015
    Assignee: FUJIFILM CORPORATION
    Inventor: Taro Asami
  • Patent number: 9036279
    Abstract: An imaging lens provided with a negative first lens group and a positive second lens group disposed in order from the object side. The first lens group is composed of a first group first lens which is a negative biconcave single lens, and the second lens group is composed of a positive second group first lens, an aperture stop, a positive second group second lens, and a negative second group third lens disposed in order from the object side. The second group second lens and second group third lens are cemented together to form a cemented lens. The imaging lens is configured to satisfy a conditional expression (3) 0.9<dt3/f<1.3, and further configured to satisfy conditional expression (1) 31<?d2<55 or (1?): 35<?d2 and a conditional expression (2): ?10<?d1??d2<25.
    Type: Grant
    Filed: January 13, 2014
    Date of Patent: May 19, 2015
    Assignee: FUJIFILM CORPORATION
    Inventors: Katsuhisa Tsutsumi, Yoshiaki Ishii
  • Patent number: 9013811
    Abstract: An imaging lens formed of 4 lenses, in which a negative first lens having a meniscus shape with a convex surface on the object side, a biconvex positive second lens, a negative third lens having a concave surface on the image side, and a positive fourth lens having a convex surface on the object side, arranged in order from the object side, and the imaging lens satisfies conditional expressions (1): L12/f<0.82; (2): 2.3<L12×R2F2/f2<10.0; (5): ?1.3<f1/f<?0.9; and (6): 48<v1 simultaneously, where, L12 is the air equivalent distance between the first lens and the second lens, f is the focal length of the entire lens system, R2F is the radius of curvature of the object side lens surface of the second lens, f1 is the focal length of the first lens, and v1 is the Abbe number of the first lens with respect to the d-line.
    Type: Grant
    Filed: January 8, 2014
    Date of Patent: April 21, 2015
    Assignee: FUJIFILM Corporation
    Inventor: Masao Mori
  • Patent number: 9013812
    Abstract: An imaging lens includes a first lens group having negative refractive power; a stop; and a second lens group having positive refractive power, arranged in the order from the object side to the image plane side. The first lens group includes a first lens having a strong concave surface facing the image plane side and negative refractive power; and a second lens having negative refractive power and a biconcave lens shape near the optical axis. The second lens group includes a third lens having a biconvex shape; and a lens group that is composed of a lens having positive refractive power and a lens having negative refractive power, and has negative refractive power as a whole. The first lens group has a focal length F1 and the second lens group has a focal length F2 so that the following conditional expression is satisfied: ?1.0<F1/F2<?0.5.
    Type: Grant
    Filed: February 17, 2014
    Date of Patent: April 21, 2015
    Assignee: Optical Logic Inc.
    Inventors: Yoji Kubota, Kenichi Kubota, Hitoshi Hirano
  • Patent number: 8985776
    Abstract: A projector for projecting light onto a projection surface includes a first group (1) with a negative meniscus, a second group (2) with positive refractive power, a third group (3) with a single lens, a fourth group (4) with a lens with positive refractive power, and a field lens (5) with positive refractive power, such that the light passes through the projection objective from the fourth to the first group. In order to be provide a high image quality with a small number of optical components and the smallest dimensions, the projector is configured so the common focal width of the fourth group (4) and the field lens (5) is smaller than twice the image circle diameter (9) of the projection objective and the maximum free diameter (8) is smaller than the overall focal width, and in particular smaller than 0.8 times the overall focal width of the projection objective.
    Type: Grant
    Filed: October 7, 2009
    Date of Patent: March 24, 2015
    Assignee: Sypro Optics GmbH
    Inventors: Guenther Benedix, Gudrun Schroeter, Gertrud Blei, Rainer Fischer, Eberhard Piehler
  • Patent number: 8988796
    Abstract: An image capturing lens system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element has refractive power. The second lens element with positive refractive power has a convex image-side surface in a paraxial region thereof. The third lens element with negative refractive power has a concave object-side surface in a paraxial region thereof and a convex image-side surface in a paraxial region thereof. The fourth lens element with refractive power has a concave image-side surface in a paraxial region thereof, wherein both of an object-side surface and the image-side surface thereof are aspheric, and the image-side surface thereof has at least one convex shape in an off-axis region thereof. The image capturing lens system has a total of four lens elements with refractive power.
    Type: Grant
    Filed: December 13, 2013
    Date of Patent: March 24, 2015
    Assignee: Largan Precision Co., Ltd.
    Inventor: Wei-Yu Chen
  • Patent number: 8982479
    Abstract: A wide-angle image capturing lens assembly includes four lens elements with refractive power, in order from an object side to an image side, a first lens element, a second lens element, a third lens element and a fourth lens element and each of the first through fourth lens elements is single and non-cemented. The first lens element with negative refractive power has a concave image-side surface. The second lens element with refractive power has a concave object-side surface and a convex image-side surface. The third lens element with positive refractive power has a convex image-side surface. The fourth to lens element with negative refractive power has a concave object-side surface and a convex image-side surface, wherein both of the object-side surface and the image-side surface of the fourth lens element are aspheric.
    Type: Grant
    Filed: March 10, 2013
    Date of Patent: March 17, 2015
    Assignee: Largan Precision Co., Ltd.
    Inventors: Dung-Yi Hsieh, Wei-Yu Chen
  • Patent number: 8964310
    Abstract: An imaging lens includes a negative first lens, a negative second lens, a third lens of a plano-convex shape having a convex surface directed toward an object side or of a positive meniscus shape having a convex surface directed toward the object side, and a fourth lens of a plano-convex shape having a convex surface directed toward an image side or of a positive meniscus shape having a convex surface directed toward the image side, which are arranged in this order from the object side. Further, the following conditional formula (4) is satisfied: 1.0<D2/f<2.5??(4), where f: a focal length of an entire system, and D2: a distance on an optical axis between the first lens and the second lens.
    Type: Grant
    Filed: October 22, 2013
    Date of Patent: February 24, 2015
    Assignee: FUJIFILM Corporation
    Inventor: Taro Asami
  • Patent number: 8947785
    Abstract: The endoscope objective lens is configured such that focusing from the farthest object to the nearest object is achieved by moving at least one lens group other than the most object-side lens group along the optical axis. One of the at least one lens group to be moved during focusing is a negative lens group. The one negative lens group that is moved during the focusing consists of a cemented lens that is formed by a positive lens and a negative lens cemented together in this order from the object side. The cemented surface of the cemented lens is oriented such that the concave surface faces the object side. Given conditional expressions are satisfied.
    Type: Grant
    Filed: April 14, 2014
    Date of Patent: February 3, 2015
    Assignee: FUJIFILM Corporation
    Inventor: Chikara Yamamoto
  • Patent number: 8947793
    Abstract: An inner focus lens system comprises, in order from an object side to an image side, a first lens unit, an aperture stop, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive refractive power. The first lens unit has at least one negative lens and at least one positive lens, the second lens unit has at least one negative lens and at least one positive lens, the third lens unit has at least one negative lens, and the fourth lens unit has at least one positive lens. When focusing on an object at a short distance from an object at infinity, the third lens unit moves to lengthen a distance to the second lens unit and to shorten a distance to the fourth lens unit.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: February 3, 2015
    Assignee: Olympus Imaging Corp.
    Inventor: Masaru Morooka
  • Patent number: 8922916
    Abstract: An endoscope objective lens substantially consists of four lens groups consisting of, in order from the object side, a negative first lens group, a positive second lens group, a negative third lens group and a positive fourth lens group. During focusing from the farthest object to the nearest object, the first lens group is fixed, and the second lens group and the third lens group are moved along the optical axis. The third lens group includes a cemented lens that is formed by a positive lens and a negative lens cemented together in this order from the object side, and the cemented surface of the cemented lens is oriented such that the concave surface faces the object side.
    Type: Grant
    Filed: May 6, 2014
    Date of Patent: December 30, 2014
    Assignee: FUJIFILM Corporation
    Inventors: Chikara Yamamoto, Yoshiaki Ishii
  • Patent number: 8879173
    Abstract: An imaging lens includes a first lens and a third lens having negative refractive power, and a second lens and a fourth lens having positive refractive power. Curvature radiuses of surfaces of the first lens on an object side and an image plane side are positive. A curvature radius of a surface of the second lens on the object side is positive. Curvature radiuses of surfaces of the third lens on the object side and the image plane side are negative. Curvature radiuses of surfaces of the fourth lens on the object side and the image plane side are positive. The first lens has a focal length f1 and the second lens has a focal length f2, so that the following conditional expression is satisfied: ?0.6<f2/f1<?0.1.
    Type: Grant
    Filed: October 24, 2012
    Date of Patent: November 4, 2014
    Assignees: Optical Logic Inc., Kantatsu Co., Ltd.
    Inventors: Yoji Kubota, Kenichi Kubota, Hitoshi Hirano, Tomohiro Yonezawa
  • Patent number: 8879901
    Abstract: An optical attachment configured to be operably attached to the image side of an objective lens to reduce the focal length and focal ratio of the objective lens. The focal-reducing attachment includes four lens elements and has a magnification of between 0.5 and 1. The focal-reducing lens can work with objective lenses having relatively large working distances for a large format size as well as with cameras having a smaller format size and relatively small permissible working distance.
    Type: Grant
    Filed: August 20, 2012
    Date of Patent: November 4, 2014
    Assignee: Caldwell Photographic, Inc.
    Inventors: J. Brian Caldwell, Wilfried Bittner
  • Patent number: 8842380
    Abstract: An imaging lens includes: a first lens group; a second lens group having positive refractive power; and a third lens group having negative refractive power, which are arranged in order from an object side, wherein the first lens group includes a former lens group having a negative lens in a most object side, a diaphragm, and a rear lens group, and wherein, when focusing is performed, the second lens group is moved in the optical axis direction.
    Type: Grant
    Filed: May 29, 2012
    Date of Patent: September 23, 2014
    Assignee: Sony Corporation
    Inventor: Toshihiro Sunaga
  • Patent number: 8842210
    Abstract: There is provided a zoom lens including in order from an object side to an image side, a first lens group having negative refractive power, a second lens group having positive refractive power, a third lens group having negative refractive power, and a fourth lens group having positive refractive power. In zooming from a wide-angle end to a telescopic end, the first lens group moves to the object side in a manner that a distance toward the second lens group narrows, and a distance between the third lens group and the fourth lens group widens. The third lens group includes a single lens or a single cemented lens.
    Type: Grant
    Filed: April 3, 2013
    Date of Patent: September 23, 2014
    Assignee: Sony Corporation
    Inventors: Hiroki Hagiwara, Atsushi Oohata
  • Patent number: 8842379
    Abstract: An image capturing lens assembly includes, in order from an object-side to an image-side along an optical axis, a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element with negative refractive power has an image-side surface being concave at a paraxial region. The second lens element with positive refractive power has an image-side surface being convex at a paraxial region. The third lens element with negative refractive power has an object-side surface being concave at a paraxial region, and an image-side surface being convex at a paraxial region. The fourth lens element with positive refractive power has an object-side surface being convex at a paraxial region, and an image-side surface being concave at a paraxial region, and at least one of the object-side surface and the image-side surface is aspheric.
    Type: Grant
    Filed: February 8, 2013
    Date of Patent: September 23, 2014
    Assignee: Largan Precision Co., Ltd.
    Inventors: Chih-Wen Hsu, Tsung-Han Tsai, Wei-Yu Chen
  • Publication number: 20140240855
    Abstract: An endoscope objective lens substantially consists of four lens groups consisting of, in order from the object side, a negative first lens group, a positive second lens group, a negative third lens group and a positive fourth lens group. During focusing from the farthest object to the nearest object, the first lens group is fixed, and the second lens group and the third lens group are moved along the optical axis. The third lens group includes a cemented lens that is formed by a positive lens and a negative lens cemented together in this order from the object side, and the cemented surface of the cemented lens is oriented such that the concave surface faces the object side.
    Type: Application
    Filed: May 6, 2014
    Publication date: August 28, 2014
    Applicant: FUJIFILM Corporation
    Inventors: Chikara YAMAMOTO, Yoshiaki ISHII
  • Patent number: 8817387
    Abstract: An imaging lens includes a first lens having negative refractive power; a second lens having positive refractive power; a third lens having positive refractive power; and a fourth lens having negative refractive power, arranged from an object side to an image plane side. In the first lens, a curvature radius of an image-side surface is positive. In the second lens, curvature radii of the object-side surface and the image-side surface are both negative. In the third lens, a curvature radius of the object-side surface is positive and a curvature radius of the image-side surface is negative. When a whole lens system has a focal length f and the first lens has a focal length f1, the imaging lens satisfies the following conditional expression: ?3.0<f1/f<?1.
    Type: Grant
    Filed: October 10, 2012
    Date of Patent: August 26, 2014
    Assignee: Optical Logic Inc.
    Inventors: Yoji Kubota, Kenichi Kubota, Hitoshi Hirano
  • Publication number: 20140233112
    Abstract: The angle of view of an objective optical system is widened, while suppressing generation of lateral chromatic aberration. An objective optical system includes: a first lens group having a negative power; an aperture stop; and a second lens group having a positive power, in this order from an object side. The first lens group includes a negative single first lens, and a cemented lens formed by cementing a positive lens and a negative lens together, provided in this order from the object side. The second lens group includes a positive single fourth lens, and a cemented lens formed by cementing a positive lens and a negative lens together, provided in this order from the object side. The objective optical system satisfies Conditional Formula (1): 15.0<?d(RN)<18.6, wherein ?d(RN) is the Abbe's number of the negative lens in the cemented lens within the second lens group with respect to the d line.
    Type: Application
    Filed: April 28, 2014
    Publication date: August 21, 2014
    Applicant: FUJIFILM Corporation
    Inventor: Keisuke HARADA
  • Publication number: 20140233114
    Abstract: An objective optical system includes: a first lens group having a negative power; an aperture stop; and a second lens group having a positive power, provided in this order from an object side. The first lens group includes a first lens, which is a negative single lens, and a cemented lens formed by a positive lens and a negative lens, provided in this order from the object side. The second lens group includes a fourth lens, which is a positive single lens, and a cemented lens formed by a positive lens and a negative lens, provided in this order from the object side. The objective optical system simultaneously satisfies Conditional Formulae (1) ?1.5<f123/f<?0.5 and (2) 1.8<f456/f<2.1, wherein f is the focal length of the entire system, f123 is the combined focal system of the first lens group, and f456 is the combined focal length of the second lens group.
    Type: Application
    Filed: April 30, 2014
    Publication date: August 21, 2014
    Applicant: FUJIFILM Corporation
    Inventors: Keisuke HARADA, Yoshiaki ISHII
  • Publication number: 20140233113
    Abstract: An objective optical system includes: a negative first lens group; an aperture stop; and a positive second lens group, provided in this order from an object side. The first lens group includes a first lens, which is a negative single lens, and a cemented lens formed by cementing a positive lens and a negative lens together, provided in this order from the object side. The second lens group includes a fourth lens, which is a positive single lens, and a cemented lens formed by cementing a positive lens and a negative lens together, provided in this order from the object side. The objective optical system satisfies Conditional Formula (1): f1/f<1.1, wherein f1 is the focal length of the lens provided most toward the object side, and f is the focal length of the entire lens system.
    Type: Application
    Filed: April 30, 2014
    Publication date: August 21, 2014
    Applicant: FUJIFILM Corporation
    Inventors: Keisuke HARADA, Yoshiaki ISHII
  • Patent number: 8810926
    Abstract: Disclosed herein is an imaging lens. The imaging lens according to a preferred embodiment of the present invention includes a first lens having positive (+) power and having both sides formed to be convex, a second lens having negative (?) power and formed to be concave toward a top side, a third lens having positive power and having both sides formed to be convex, a fourth lens having positive (+) power and formed to be convex toward a top side, and a fifth lens having negative (?) power and formed to be concave toward the top side, wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are disposed in order from an object side.
    Type: Grant
    Filed: April 18, 2012
    Date of Patent: August 19, 2014
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Tae Young Kim
  • Publication number: 20140226222
    Abstract: A wide-angle image capturing lens assembly includes four lens elements with refractive power, in order from an object side to an image side, a first lens element, a second lens element, a third lens element and a fourth lens element and each of the first through fourth lens elements is single and non-cemented. The first lens element with negative refractive power has a concave image-side surface. The second lens element with refractive power has a concave object-side surface and a convex image-side surface. The third lens element with positive refractive power has a convex image-side surface. The fourth to lens element with negative refractive power has a concave object-side surface and a convex image-side surface, wherein both of the object-side surface and the image-side surface of the fourth lens element are aspheric.
    Type: Application
    Filed: March 10, 2013
    Publication date: August 14, 2014
    Applicant: LARGAN PRECISION CO., LTD.
    Inventors: Dung-Yi HSIEH, Wei-Yu CHEN
  • Patent number: 8780451
    Abstract: A zoom lens system comprising a negative first lens unit, a positive second lens unit, a negative third lens unit, and a positive fourth lens unit, wherein the second lens unit is composed of an object-side second lens unit and an image-side second lens unit, the object-side second lens unit has positive optical power, an aperture diaphragm is located between the object-side second lens unit and the image-side second lens unit, and the conditions: ?0.5<f2O/f2I<1.0 and 0.12<d2O/fW<0.35 (f2O: a composite focal length of the object-side second lens unit, f2I: a composite focal length of the image-side second lens unit, d2O: an optical axial distance from a most object side lens surface of the object-side second lens unit to the aperture diaphragm, fW: a focal length of the entire system at a wide-angle limit) are satisfied.
    Type: Grant
    Filed: January 30, 2013
    Date of Patent: July 15, 2014
    Assignee: Panasonic Corporation
    Inventor: Takuya Imaoka
  • Publication number: 20140098432
    Abstract: An imaging lens includes a first lens having negative refractive power; a second lens having positive refractive power; a third lens having positive refractive power; and a fourth lens having negative refractive power, arranged from an object side to an image plane side. In the first lens, a curvature radius of an image-side surface is positive. In the second lens, curvature radii of the object-side surface and the image-side surface are both negative. In the third lens, a curvature radius of the object-side surface is positive and a curvature radius of the image-side surface is negative. When a whole lens system has a focal length f and the first lens has a focal length f1, the imaging lens satisfies the following conditional expression: ?3.0<f1/f<?1.
    Type: Application
    Filed: October 10, 2012
    Publication date: April 10, 2014
    Applicant: OPTICAL LOGIC INC.
    Inventors: Yoji KUBOTA, Kenichi KUBOTA, Hitoshi HIRANO
  • Publication number: 20140078604
    Abstract: An imaging lens consists of a negative first lens, a negative second lens, a third lens of a plano-convex shape having a convex surface directed toward an object side or of a positive meniscus shape having a convex surface directed toward the object side, and a fourth lens of a plano-convex shape having a convex surface directed toward an image side or of a positive meniscus shape having a convex surface directed toward the image side, which are arranged in this order from the object side. Further, the following conditional formula (1) is satisfied: 2.25<?d2/?d3??(1), where ?d2: an Abbe number of a material of the second lens for d-line, and ?d3: an Abbe number of a material of the third lens for d-line.
    Type: Application
    Filed: April 27, 2012
    Publication date: March 20, 2014
    Applicant: FUJIFILM CORPORATION
    Inventor: Taro Asami
  • Patent number: 8670193
    Abstract: An optical system includes a negative lens unit including one or more negative lenses located closest to an object side, and a positive lens unit having positive refractive power including a plurality of lenses on an image side of the negative lens unit. When the one or more negative lenses are denoted by negative lenses LNi (i=1, 2, . . . ) in order from the object side, and a portion of lenses among the plurality of the lenses constituting the positive lens unit is denoted by lenses LAj (j=1, 2, . . . ) in order from the object side, a focal length fni of the negative lens LNi, a refractive index Nni of a material thereof, a focal length fAj of the lens LAj, a refractive index NAj, and partial dispersion ratio ?gFAj of a material of the lens LAj are set to satisfy respective predetermined conditions.
    Type: Grant
    Filed: August 28, 2012
    Date of Patent: March 11, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hironobu Koga
  • Patent number: 8665528
    Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit of a negative refractive power, a second lens unit of a positive refractive power, and a third lens unit of a positive refractive power, an interval between the first lens unit and the second lens unit and an interval between the second lens unit and the third lens unit being configured to change in zooming from a wide angle end to a telephoto end. The first lens unit includes, in order from the object side to the image side, a negative lens and a positive lens. The predetermined conditions are satisfied.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: March 4, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Akihiko Yuki
  • Patent number: 8654458
    Abstract: The present invention provides a wide-angle imaging lens assembly comprising, in order from an object side to an image side: a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a third lens element with positive refractive power; a fourth lens element with negative refractive power having a concave image-side surface; and a fifth lens element with positive refractive power; wherein the two lens elements with refractive power closest to the object side are the first lens element and the second lens element; and wherein the number of lens elements with refractive power does not exceed six.
    Type: Grant
    Filed: December 27, 2010
    Date of Patent: February 18, 2014
    Assignee: Largan Precision Co., Ltd.
    Inventors: Tsung Han Tsai, Hsiang Chi Tang
  • Patent number: 8605371
    Abstract: A Miniature zoom lens, in particular for use in mobile telephones, in which the zoom lens, as viewed from the object plane, has the following in the stated sequence: at least one negative first optical lens group, at least one negative second optical lens group, at least one positive third optical lens group, and at least one positive fourth optical lens group. The second, third, and fourth optical lens groups are configured in such a way that focusing is achieved solely by displacement of the fourth optical lens group, and during the focusing the positions of the second and third lens groups remain unchanged.
    Type: Grant
    Filed: June 10, 2011
    Date of Patent: December 10, 2013
    Assignee: Qioptiq Photonics GmbH & Co. KG
    Inventor: Witold Hackemer
  • Publication number: 20130317299
    Abstract: An endoscope optical system, including a front group and a rear group arranged in this order from an object side such that an aperture stop is arranged between the front and rear groups, wherein the front group includes a negative lens and a positive lens arranged in this order from the object side, the rear group includes a positive lens and a cemented lens arranged in this order from the object side, and when f (unit: mm) denotes a focal length of an entire endoscope optical system, EX (unit: mm) denotes a distance (which takes a minus sign on the object side with respect to an image plane) from the image plane to an exit pupil, and f2 (unit: mm) denotes a focal length of the rear group, the endoscope optical system satisfies conditions: ?10<EX/f<?6??(1), and 1.15<f2/f<1.35??(2).
    Type: Application
    Filed: February 7, 2012
    Publication date: November 28, 2013
    Applicant: HOYA CORPORATION
    Inventor: Hiroaki Fujii
  • Patent number: 8531780
    Abstract: An optical imaging lens assembly comprises, in order from an object side to an image side, a first lens element, a second lens element, a third lens element and a fourth lens element. There is a stop disposed between the first lens element and the third lens element. The first lens element has negative refractive power, the second lens element has positive refractive power, the third lens element has negative refractive power, and the fourth lens element has positive refractive power. The first lens element has a convex object-side surface and a concave image-side surface. The third lens element and the fourth lens element both have at least one of its object-side surface and its image-side surface being aspheric. With the aforementioned arrangement, the optical imaging lens assembly of the present invention can obtain a larger viewing angle, lower sensitivity and higher resolution.
    Type: Grant
    Filed: July 13, 2011
    Date of Patent: September 10, 2013
    Assignee: Largan Precision Co., Ltd.
    Inventors: Tsung-Han Tsai, Hsin-Hsuan Huang
  • Patent number: 8508853
    Abstract: A projection lens consists of first and second les groups and a stop. The first lens group is formed of a negative lens. The second lens group is formed of three positive lenses and a negative lens. The stop is disposed between the first and second lens groups or in the second lens group. The first and second lens groups are arranged in order from a magnification side. The projection lens is telecentric on a reduction side. The projection lens is configured to satisfy the following conditional expressions (1) and (2): 1.0?f2h/f?5.0??(1) ?2.5?f1/f??0.8??(2) where f2h is a focal length of an aspheric lens of at least one of the first and second positive lenses of the second lens group, f is a focal length of the whole system, and f1 is a focal length of the first lens group.
    Type: Grant
    Filed: August 24, 2010
    Date of Patent: August 13, 2013
    Assignee: FUJIFILM Corporation
    Inventor: Masaru Amano
  • Patent number: 8432622
    Abstract: An image capturing lens system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element with negative refractive power has a convex object-side surface and a concave image-side surface. The second lens element with positive refractive power has a concave object-side surface and a convex image-side surface. The third lens element with negative refractive power is made of plastic material, and has a concave image-side surface, wherein an object-side surface and the image-side surface of the third lens element are aspheric. The fourth lens element with positive refractive power is made of plastic material, wherein an object-side surface and an image-side surface of the fourth lens element are aspheric.
    Type: Grant
    Filed: December 26, 2011
    Date of Patent: April 30, 2013
    Assignee: Largan Precision Co., Ltd.
    Inventors: Hsin-Hsuan Huang, Tsung-Han Tsai
  • Patent number: 8422150
    Abstract: An objective optical system including an objective optical system having a field angle of 140° or larger and including a front group, an aperture stop, and a positive rear group arranged in that order from an object side. The front group has at least one aspherical surface and includes a negative first lens disposed closest to the object side and satisfying the following conditional expression: 0?r2/r1<0.24, 0.1<|g2/g1|<2.2 and ?1.8<f1/fl<?0.8, where r1 denotes the radius of curvature of the object side of the first lens, r2 denotes the radius of curvature of an image side of the first lens, g1 denotes the focal length of the front group, g2 denotes the focal length of the rear group, f1 denotes a focal length of the first lens, and fl denotes the focal length of the entire system.
    Type: Grant
    Filed: January 11, 2012
    Date of Patent: April 16, 2013
    Assignee: Olympus Medical Systems Corp.
    Inventor: Hideyasu Takato
  • Patent number: 8416511
    Abstract: An imaging lens is provided and includes: in order from the object side, a negative first lens, a negative second lens, a positive third lens, a stop, and a positive fourth lens. In the lens, each of the second lens, the third lens, and the fourth lens has at least one aspheric surface, and an Abbe number of a material of the third lens at the d-line is 35 or less. In addition, the imaging lens satisfies the following Conditional Expression (1): ?0.2<(R3+R4)/(R3?R4)<0.2??(1) where R3 is a paraxial radius of curvature of the object side surface of the second lens, and R4 is a paraxial radius of curvature of the image side surface of the second lens.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: April 9, 2013
    Assignee: FUJIFILM Corporation
    Inventor: Taro Asami
  • Patent number: 8411378
    Abstract: A zoom lens includes a negative first lens unit G1 and a positive second lens unit G2. The second lens unit G2 includes first and second cemented lens components that are arranged adjacent to each other. The first and second cemented lens components are each made up of a plurality of lens elements having different refractive indices and different Abbe constants. The image side surface of the first cemented lens component and the object side surface of the second cemented lens component are both concave surfaces.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: April 2, 2013
    Assignee: Olympus Imaging Corp.
    Inventors: Nobumasa Kanbayashi, Masato Miyata
  • Publication number: 20130064532
    Abstract: An optical attachment configured to be operably attached to the image side of an objective lens to reduce the focal length and focal ratio of the objective lens. The focal-reducing attachment includes four lens elements and has a magnification of between 0.5 and 1. The focal-reducing lens can work with objective lenses having relatively large working distances for a large format size as well as with cameras having a smaller format size and relatively small permissible working distance.
    Type: Application
    Filed: August 20, 2012
    Publication date: March 14, 2013
    Inventors: J. Brian Caldwell, Wilfried Bittner
  • Patent number: 8379326
    Abstract: An imaging lens includes a first lens, a second lens, a third lens, an aperture stop, and a fourth lens, sequentially arranged from the object-side of the imaging lens. The first lens has negative power, and an object-side surface is convex and an image-side surface is concave. Both surfaces of the second lens are aspheric, and in the vicinity of the optical axis, the second lens has negative power, and the object-side surface is convex and the image-side surface is concave. Both surfaces of the third lens are aspheric, and in the vicinity of the optical axis, the third lens has positive power, and the object-side surface is convex, and the image-side surface is concave. Both surfaces of the fourth lens are aspheric, and in the vicinity of the optical axis, the fourth lens has positive power, and the object-side surface is concave, and the image-side surface is convex.
    Type: Grant
    Filed: February 3, 2011
    Date of Patent: February 19, 2013
    Assignee: Fujifilm Corporation
    Inventor: Hiromitsu Yamakawa
  • Patent number: 8369022
    Abstract: A variable magnification optical system of the present invention and an image pickup device and a digital apparatus including this are provided with a four-component optical system of negative-negative-positive-negative arrangement, wherein a first lens group thereof includes only one negative lens as a lens having an optical power, and a third lens group thereof satisfies a conditional expression of 1.4<?3t/?3w<4 when ?3t and ?3w respectively denote image magnifications of the third lens group at a telephoto end and at a wide-angle end. The variable magnification optical system, the image pickup device and the digital apparatus having such a construction can be further downsized.
    Type: Grant
    Filed: May 18, 2010
    Date of Patent: February 5, 2013
    Assignee: Konica Minolta Opto, Inc.
    Inventor: Keiji Matsusaka
  • Patent number: 8331033
    Abstract: A zoom optical system comprising, in order from the object side, a first lens unit with negative power, a second lens unit with positive power, a third lens unit with positive power, and a fourth lens unit, wherein spacing between the first lens unit and the fourth lens unit is fixed to an image surface, and the second lens unit and the third lens unit are moved on an optical axis so as to change spacings between the respective lens units when the magnification of the zoom optical system is changed. The third lens unit comprises lens elements more than three, including an aperture stop, at least a lens element with positive power and at least a lens element with negative power, and the most image-side lens element of the third lens unit is a meniscus lens element with a concave surface facing the image side.
    Type: Grant
    Filed: March 22, 2010
    Date of Patent: December 11, 2012
    Assignee: Olympus Corporation
    Inventor: Keigo Matsuo
  • Patent number: 8325422
    Abstract: A zoom lens disposed between an object side and an image side and including a first, second, third, and fourth lens group is provided. The first lens group has a negative refractive power and includes a first lens and a prism arranged in sequence from the object side to the image side. The first lens is an aspheric lens. A distance between the first lens and the prism is L, an effective focal length of the zoom lens at a wide-end is fw, and 1.58<L/fw<1.88. The second lens group disposed between the first lens group and the image side has a positive power and includes a first double cemented lens. The third lens group disposed between the second lens group and the image side has a negative power and includes a second double cemented lens. The fourth lens group has a positive power.
    Type: Grant
    Filed: July 20, 2011
    Date of Patent: December 4, 2012
    Assignee: Young Optics Inc.
    Inventors: Kuo-Chuan Wang, Hsin-Te Chen
  • Patent number: 8314998
    Abstract: Disclosed is an imaging lens that has a wide angle of view, a small size in the diametric direction of a lens system, and a good optical performance. An imaging lens includes a first negative lens having a meniscus shape in which a concave surface faces an image side, a second negative lens having a meniscus shape in which a concave surface faces the image side and including at least one aspheric surface, a third positive lens including at least one aspheric surface, an aperture diaphragm, and a fourth positive lens including at least one aspheric surface, which are arranged in this order from an object side. The imaging lens satisfies the following Conditional expression 1: f2/f<?4.5, where f indicates the focal length of the entire system and f2 indicates the focal length of the second lens.
    Type: Grant
    Filed: July 28, 2010
    Date of Patent: November 20, 2012
    Assignee: Fujifilm Corporation
    Inventor: Taro Asami
  • Patent number: 8270097
    Abstract: An imaging lens includes a first lens, a second lens, a third lens, an aperture stop, and a fourth lens, sequentially arranged from the object-side. The first lens has negative power, and an object-side surface is convex and an image-side surface is concave. Both surfaces of the second lens are aspheric, and in the vicinity of the optical axis, the second lens has negative power, and the object-side surface is concave and the image-side surface is convex. Both surfaces of the third lens are aspheric, and in the vicinity of the optical axis, the third lens has positive power, and the object-side surface is convex, and the image-side surface is convex. Both surfaces of the fourth lens are aspheric, and in the vicinity of the optical axis, the fourth lens has positive power, and the object-side surface is concave, and the image-side surface is convex.
    Type: Grant
    Filed: January 25, 2011
    Date of Patent: September 18, 2012
    Assignee: Fujifilm Corporation
    Inventor: Hiromitsu Yamakawa