Four Groups Patents (Class 359/686)
  • Patent number: 10495856
    Abstract: A wide-angle lens system that includes four lens groups arranged from object to image and having a field of view greater than 90 degrees is described. The lens elements within each of the four groups are selected for optimization of performance factors of low chromatic aberration, low optical distortion and manufacturability. Design methods are included and shown through exemplary optimized designs.
    Type: Grant
    Filed: October 25, 2015
    Date of Patent: December 3, 2019
    Inventor: Alex Ning
  • Patent number: 10409044
    Abstract: A zoom optical system and automated luminaire are provided. The zoom optical system includes a light source and compensator, variator, and objective lens groups. The light source illuminates an object in an object plane. The compensator lens group is optically coupled to the object without intervening lenses, has a positive optical power, six lenses, and moves relative to the object plane. The variator lens group is optically coupled to the compensator lens group without intervening lenses, has a negative optical power, three lenses, and moves relative to the object plane and the compensator group. The objective lens group is optically coupled to the variator lens group without intervening lenses, has a second positive optical power, three lenses, remains in a fixed position relative to the object plane, and projects an image of the object without intervening lenses between the objective lens group and the projected image.
    Type: Grant
    Filed: October 10, 2018
    Date of Patent: September 10, 2019
    Assignee: Robe Lighting s.r.o.
    Inventors: Jan Vilem, Josef Valchar
  • Patent number: 10379319
    Abstract: A zoom lens includes, in order from an object along an optical axis: a first lens group having a negative refractive power; a second lens group having a positive refractive power; a third lens group having a negative refractive power; a fourth lens group; and a fifth lens group. When the zoom lens performs varying magnification, the distance between the first and second lens groups changes, the distance between the second and third lens groups changes, the distance between the third and fourth lens groups changes, the distance between the fourth and fifth lens groups changes, the second and fourth lens groups move along the same trajectory along the optical axis, and at least the third lens group moves along the optical axis.
    Type: Grant
    Filed: January 29, 2016
    Date of Patent: August 13, 2019
    Assignee: Nikon Corporation
    Inventor: Takeshi Umeda
  • Patent number: 10310255
    Abstract: A zoom lens including: a positive first lens unit; a negative second lens unit; and a positive rear lens group, an interval of adjacent lens units is changed during zooming, the rear lens group includes from an object side: a positive lens system; an aperture stop; and a negative partial lens system, the first lens unit and the aperture stop are positioned closer to the object side at a telephoto end than at a wide angle end, and a combined focal length of a front lens system between the first lens unit and the aperture stop at the wide angle end, an absolute value of a distance on an optical axis from a first lens surface to the aperture stop at the wide angle end, a focal length of the first lens unit, and a focal length of the zoom lens at the wide angle end is appropriately set.
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: June 4, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yoshihisa Tashiro
  • Patent number: 10295805
    Abstract: A zooming optical system includes 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 that order from an object side. The first lens group has at least one cemented lens having positive refractive power. Each of the first lens group, the second lens group, the third lens group, and the fourth lens group are configured to move along a direction of an optical axis in zooming. Conditional expression (1) below is satisfied: ?10.0<f2/f1<?2.0??(1), where f1 is a focal length of the first lens group, and f2 is a focal length of the second lens group.
    Type: Grant
    Filed: November 29, 2017
    Date of Patent: May 21, 2019
    Assignee: Ricoh Company, Ltd.
    Inventor: Takahiko Ohishi
  • Patent number: 10288856
    Abstract: A variable magnification optical system includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and at least one lens unit. A second predetermined positive lens element satisfies conditional expressions (1) and (2) and a second predetermined negative lens element satisfies the following conditional expressions (3) and (4). The second lens unit includes three sub-lens units and the following conditional expressions (5) and (6) are satisfied: 0.520<(?g,F)G2p<0.610??(1), 0.680<(?C,t)G2p<0.900??(2), 0.520<(?g,F)G2n<0.560??(3), 0.750<(?C,t)G2n<0.900??(4), ?0.25<fG21/fG22<0.90??(5), and ?0.70<fG21/fG23<0.40??(6).
    Type: Grant
    Filed: April 9, 2018
    Date of Patent: May 14, 2019
    Assignee: OLYMPUS CORPORATION
    Inventors: Takashi Fujikura, Yuki Zen, Tomoyuki Satori, Tetsuya Yanai
  • Patent number: 10258437
    Abstract: An apparatus is described for determining surface topography of a three-dimensional structure. The apparatus can include a probe and an illumination unit configured to output a plurality of light beams. In many embodiments, the apparatus includes a light focusing assembly. The light focusing assembly can receive and focus each of a plurality of light beams to a respective external focal point. The light focusing assembly can be configured to overlap the plurality of light beams within a focus changing assembly in order to move the external focal points along a direction of propagation of the light beams. The apparatus can include a detector having an array of sensing elements configured to measure a characteristic of each of a plurality of light beams returning from the illuminated spots and a processor coupled to the detector and configured to generate data representative of topography of the structure based on the measured characteristic.
    Type: Grant
    Filed: November 13, 2017
    Date of Patent: April 16, 2019
    Assignee: Align Technology, Inc.
    Inventors: Yossef Atiya, Tal Verker
  • Patent number: 10247928
    Abstract: A zoom lens includes, in order from the object side, a first lens unit having negative refractive power, a second lens unit having positive refractive power, a third lens unit having negative refractive power, and a fourth lens unit having positive refractive power. At a time of zooming from a wide-angle end to a telephoto end, the distance between the first lens unit and the second lens unit is reduced, the distance between the third lens unit and the fourth lens unit is increased, and the fourth lens unit is fixed.
    Type: Grant
    Filed: December 13, 2017
    Date of Patent: April 2, 2019
    Assignee: OLYMPUS CORPORATION
    Inventors: Akinori Nishio, Koji Nakagawa
  • Patent number: 10215973
    Abstract: A zoom lens unit includes, in order from an object side to an image side, a first lens group having positive refractive power and a focus function, a second lens group having negative refractive power, which moves when changing a magnification, a third lens group which moves when changing a magnification, and a fourth lens group having positive refractive power, which is fixed when changing a magnification, wherein the following condition (1) is fulfilled: |M2W·M3W·M4W|<0.14 ??(1) where M2W represents an imaging magnification of the second lens group at a wide-angle end, M3W represents an imaging magnification.the third lens group at the wide-angle end, and M4W represents an imaging magnification of the fourth lens group at the wide-angle end.
    Type: Grant
    Filed: May 2, 2017
    Date of Patent: February 26, 2019
    Assignee: RICOH COMPANY, LTD.
    Inventor: Kazuyasu Ohashi
  • Patent number: 10209484
    Abstract: A photographing 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 positive refractive power. The second lens element has negative refractive power. The third lens element having positive refractive power has an image-side surface being concave, and an object-side surface and the image-side surface thereof being aspheric. The fourth lens element has an object-side surface being concave, and the object-side surface and an image-side surface thereof being aspheric. The photographing lens system further includes an aperture stop, and no lens elements are disposed between the aperture stop and the first lens element. The photographing lens system has a total of four lens elements.
    Type: Grant
    Filed: July 21, 2017
    Date of Patent: February 19, 2019
    Assignee: LARGAN PRECISION CO., LTD.
    Inventor: Hsin-Hsuan Huang
  • Patent number: 10101641
    Abstract: Provided are a zoom lens, a projection display device including the zoom lens, and an imaging apparatus including the zoom lens. The zoom lens forms an intermediate image at a position conjugate to a reduction side imaging plane and forms the intermediate image again on a magnification side imaging plane. The zoom lens includes: a first optical system on the magnification side; and a second optical system on the reduction side. The intermediate image is formed between the magnification side and the reduction side. The second optical system includes two movable lens groups, which move by changing spacings between the groups adjacent to each other in a direction of an optical axis during zooming, and two stationary lens groups which remain stationary with respect to the reduction side imaging plane during zooming. One stationary lens group is disposed to be closest to the reduction side, and has a positive refractive power.
    Type: Grant
    Filed: August 28, 2017
    Date of Patent: October 16, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Yukiko Nagatoshi, Kazuki Inoue, Akiko Nagahara
  • Patent number: 9946054
    Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a rear lens group including a lens unit having negative refractive power arranged along an optical axis thereof. A focal length fw of the zoom lens at a wide-angle end, a focal length ft of the zoom lens at a telephoto end, an amount of movement M1 of the first lens unit on the optical axis in zooming from the wide-angle end to the telephoto end, and a focal length frn of a lens unit Lrn that is a lens unit having a shortest focal length among lens units having negative refractive power included in the rear lens group are appropriately set based on predetermined mathematical conditions.
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: April 17, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toyokatsu Fujisaki, Hiroshi Saruwatari
  • Patent number: 9915807
    Abstract: An optical imaging lens includes a plurality of lens elements arranged in order from an object side to an image side along an optical axis, and each lens element has an object-side surface and an image-side surface. There is at least one variable gap between the lens elements, and one of the lens elements closest to the object side has positive refracting power. The optical imaging lens satisfies: ?G/Gv?0.1. Here, ?G is an absolute value of a difference between a first value and a second value of the length of the at least one variable gap along the optical axis when an object having an infinite object distance and an object having an object distance of 500 millimeters are focused respectively, and Gv is the second value.
    Type: Grant
    Filed: July 19, 2016
    Date of Patent: March 13, 2018
    Assignee: GENIUS ELECTRONIC OPTICAL (XIAMEN) CO., LTD.
    Inventors: Kuo-Wen Chang, Baina Chen
  • Patent number: 9864176
    Abstract: A zoom lens including a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power; a fourth lens group having a negative refractive power; and a fifth lens group having a positive refractive power. The first through fifth lens groups are arranged sequentially from an object side to an image side of the zoom lens, and the first lens group includes a doublet lens and a lens having a positive refractive power. The second lens group includes a first sub-lens group having a negative refractive power and a second sub-lens group having a negative refractive power that is arranged to perform a focusing function. Each of the lens groups is arranged to move when the zoom lens is zoomed.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: January 9, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Min Heu
  • Patent number: 9817218
    Abstract: A zoom lens includes, in order from an object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a positive refractive power, and a fourth lens group having a negative refractive power, the fourth lens group having at least two positive lenses, the zoom lens satisfying a conditional expression (a) of ?2.0<f3/f4<?0.35 where f3 indicates a focal length of the third lens group and f4 indicates a focal length of the fourth lens group.
    Type: Grant
    Filed: February 24, 2015
    Date of Patent: November 14, 2017
    Assignee: SONY CORPORATION
    Inventor: Masaharu Hosoi
  • Patent number: 9810878
    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, wherein 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, the fourth lens unit has at least one positive lens, at the time of focusing on an object at a short distance from an object at infinity, the third lens unit moves to an image side so as to lengthen a distance to the second lens unit and to shorten a distance to the fourth lens unit, and the following conditional expression (1) is satisfied: ?6<f3/f<?1??(1).
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: November 7, 2017
    Assignee: OLYMPUS CORPORATION
    Inventor: Masaru Morooka
  • Patent number: 9791677
    Abstract: This disclosure is directed to an inner focus macrolens. The inner focus macrolens can include sequentially from an object 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, wherein the first lens unit comprises a negative lens as the closest powered lens to the object side and a positive lens, the second lens unit comprises an object side negative lens as the closest powered lens to the object side and a positive lens, the third lens unit comprises a negative lens, and the fourth lens unit comprises a positive lens.
    Type: Grant
    Filed: November 17, 2015
    Date of Patent: October 17, 2017
    Assignee: OLYMPUS CORPORATION
    Inventor: Masaru Morooka
  • Patent number: 9753247
    Abstract: A photographing 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 positive refractive power. The second lens element has negative refractive power. The third lens element having positive refractive power has an image-side surface being concave, and an object-side surface and the image-side surface thereof being aspheric. The fourth lens element has an object-side surface being concave, and the object-side surface and an image-side surface thereof being aspheric. The photographing lens system further includes an aperture stop, and no lens elements are disposed between the aperture stop and the first lens element. The photographing lens system has a total of four lens elements.
    Type: Grant
    Filed: July 30, 2015
    Date of Patent: September 5, 2017
    Assignee: LARGAN PRECISION CO., LTD.
    Inventor: Hsin-Hsuan Huang
  • Patent number: 9720212
    Abstract: A variable focal length lens system includes: first to fourth lens groups alternately having negative and positive refractive power; and an aperture stop; the first to fourth lens group being arranged to allow a space between the first and second lens groups to be decreased and spaces between the second and third lens groups and between the third and fourth lens groups to be varied, the third lens group travelling to allow image-plane position variation caused by subject position variation to be compensated and satisfying a following conditional expression, 0.05<Da/R3a<0.5??(1) where Da is a distance from the aperture stop to a most image-sided lens surface in the third lens group in the wide end state, and R3a is a curvature radius of the most-image sided lens surface in the third lens group.
    Type: Grant
    Filed: June 18, 2013
    Date of Patent: August 1, 2017
    Assignee: SONY CORPORATION
    Inventors: Motoyuki Otake, Naoki Miyagawa
  • Patent number: 9709779
    Abstract: Comprising, in order from an object side: a first lens group G1 having positive refractive power; a second lens group G2 having negative refractive power; an aperture stop S; a third lens group G3 having positive refractive power; and a fourth lens group G4 having positive refractive power; upon zooming from a wide-angle end state to a telephoto end state, the distance between the first lens group G1 and the second lens group G2, the distance between the second lens group G2 and the aperture stop S, the distance between the aperture stop S and the third lens group G3, and the distance between the third lens group G3 and the fourth lens group G4 being varied, and the distance between the aperture stop S and the fourth lens group G4 being constant; and a predetermined conditional expression being satisfied, thereby providing a variable magnification optical system which is compact in size and has a high variable magnification ratio and high optical performance, an optical apparatus, and a method for manufacturi
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: July 18, 2017
    Assignee: Nikon Corporation
    Inventor: Akihiko Obama
  • Patent number: 9690083
    Abstract: A zoom lens system includes first through fourth lens groups. Upon zooming from the short to long focal length extremities, the second and third lens groups move while the distance between the first and second lens groups increases, and the distance between the second and third lens groups decreases. The fourth lens group includes a positive lens element having a convex surface on the object side; a cemented lens having a positive lens element and a negative lens element; a biconvex positive lens element, and a negative meniscus lens element having a convex surface on the image side. The following condition (1) is satisfied: 1.6<f1/f4<3.0. . . ??(1), wherein f1 and f4 designate the focal lengths of the first and fourth lens groups, respectively.
    Type: Grant
    Filed: February 26, 2013
    Date of Patent: June 27, 2017
    Assignee: RICOH IMAGING COMPANY, LTD.
    Inventor: Masakazu Saori
  • Patent number: 9678319
    Abstract: In a zoom lens of a fixed total length, at the time of changing the magnification from the wide-angle end toward the telephoto end, the first lens group is anchored while the second lens group is moved, and the third and fourth lens groups are moved so as to be located at the object side of the telephoto end relative to the wide-angle end, such that: the interval between the second and third lens groups is decreased at the telephoto end relative to the wide-angle end; the interval between the third and fourth lens groups is increased at the telephoto end relative to the wide-angle end; and the interval between the fourth and fifth lens groups is increased at the telephoto end relative to the wide-angle end, and at the time of focusing a near object point from a remote object point, the second lens group is moved.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: June 13, 2017
    Assignee: OLYMPUS CORPORATION
    Inventors: Hirohiko Kimata, Yasuharu Yamada, Kenichi Nagasawa, Hiroshi Kodama, Toshio Takahashi, Kento Kokubu
  • Patent number: 9664883
    Abstract: An image display device includes a high-performance projection zoom lens with a very wide field angle and an image display device including a projection zoom lens of a five-lens-group type, which achieves high performance across the entire zoom area. The image display device is configured to project an image onto a target projection surface and display a magnified image of the image, which uses a projection zoom lens having a five-lens-group configuration in which first to fifth lens groups G1 to G5 are arranged from the magnification side toward the reduction side, and each of the constituent lens groups or lenses included in the lens groups has a combination of negative and positive refractive powers, and in the lens configuration, focal lengths of the constituent lens groups, relative travel distances, lens distances to the image display element, and constituent lens shapes are properly selected.
    Type: Grant
    Filed: December 27, 2013
    Date of Patent: May 30, 2017
    Assignee: RICOH COMPANY, LTD.
    Inventor: Takashi Kubota
  • Patent number: 9645382
    Abstract: An objective lens for an endoscope focuses from a farthest point object to a nearest point object by moving, along optical axis Z, at least one lens group excluding a most object-side lens group. The objective lens satisfies the formulae: 1.2?ft/fw, and 0.0<(fm?fw)/(ft?fw)?0.5, where ft is a focal length of an entire system when the objective lens has been focused on the nearest point object, fw is a focal length of the entire system when the objective lens has been focused on the farthest point object, and fm is a focal length of the entire system when the objective lens has been focused on the middle point object.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: May 9, 2017
    Assignee: FUJIFILM Corporation
    Inventor: Chikara Yamamoto
  • Patent number: 9638917
    Abstract: A zoom lens includes a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a negative refractive power. At the time of zooming, distances between the lens units change, and a distance between the first lens unit and the second lens unit at a telephoto end is shorter than at a wide angle end. An aperture stop is disposed on the image side of an image-side surface of the first lens unit, and on the object side of an image-side surface of the second lens unit. The second lens unit includes two sub lens units. The object-side sub lens unit in the second lens unit includes one lens component. The following conditional expressions are satisfied. 3.0<?D12/ERS<4.5 1.05<|f3/fUN21|<2.
    Type: Grant
    Filed: August 10, 2016
    Date of Patent: May 2, 2017
    Assignee: Olympus Corporation
    Inventors: Kazuteru Kawamura, Akiko Naito, Keitaro Yokoyama, Toshio Takahashi
  • Patent number: 9602733
    Abstract: An image forming optical system includes, a negative first lens unit, a positive second lens unit, a negative third lens unit, and a positive fourth lens unit, and the first lens unit either includes a negative lens and a positive lens, or includes a negative lens, a negative lens, and a positive lens, and the second lens unit includes a first lens component and a second lens component, and the second lens component includes a cemented lens, and the third lens unit includes either one lens or two lenses as a whole, and a lens having a curvature of a surface on an image side larger than a curvature of a surface on the object is disposed nearest to an object, and the fourth lens unit includes one positive lens component.
    Type: Grant
    Filed: May 5, 2015
    Date of Patent: March 21, 2017
    Assignee: Olympus Corporation
    Inventors: Keisuke Ichikawa, Shinichi Mihara
  • Patent number: 9594235
    Abstract: Provided is a zoom lens system, sequentially arranged in an order from an object side to an image side, including: a first lens group having a positive refractive power; a second lens group having a negative refractive power; an aperture stop; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; and a fifth lens group having a positive refractive power, wherein each of the second lens group, the third lens group, and the fourth lens group has an anomalous dispersion ?Pct of ?0.1 or less.
    Type: Grant
    Filed: December 8, 2014
    Date of Patent: March 14, 2017
    Assignee: Hanwha Techwin Co., Ltd.
    Inventor: Yasuhiko Abe
  • Patent number: 9513559
    Abstract: An objective lens system having a high numerical aperture, a large working distance, and low optical aberrations over a wide spectral band of wavelengths is disclosed. The objective lens system includes a first lens group, a second lens group, and a third lens group. The first lens group includes first and second positive meniscus lenses that are positioned at a distance from each other along an optical axis of the objective lens system. The distance may be dependent on a focal length of the objective lens system. The second lens group includes first and second meniscus lenses and a bi-convex lens. The third lens group includes a bi-concave lens and a doublet lens.
    Type: Grant
    Filed: August 5, 2015
    Date of Patent: December 6, 2016
    Assignee: ASML Holding N.V.
    Inventor: Lev Ryzhikov
  • Patent number: 9507130
    Abstract: A zoom lens with a bent optical path includes, in order from the object side to the image side, a first lens unit including the reflecting member and having a negative refractive power, 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. During zooming from the wide angle end to the telephoto end, the second lens unit moves closer to the first lens unit only toward the object side, the third lens unit moves in such a way that it becomes closest to the second lens unit at an intermediate focal length position in the course of zooming as compared to the state at the wide angle end and the state at the telephoto end, and the fourth lens unit moves. The zoom lens satisfies a certain condition.
    Type: Grant
    Filed: October 19, 2015
    Date of Patent: November 29, 2016
    Assignee: Olympus Corporation
    Inventors: Kenji Ono, Tetsuya Yanai, Masato Katayose
  • Patent number: 9448392
    Abstract: A zoom lens includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, a fifth lens unit having a positive refractive power, and an aperture stop disposed between the second lens unit and the third lens unit. At the time of zooming, the aperture stop moves and the fifth lens unit is fixed. At the time of zooming from a wide angle end to a telephoto end, a distance between the first lens unit and the second lens unit widens, a distance between the second lens unit and the third lens unit narrows, a distance between the third lens unit and the fourth lens unit fluctuates, and a distance between the fourth lens unit and the fifth lens unit fluctuates.
    Type: Grant
    Filed: August 7, 2015
    Date of Patent: September 20, 2016
    Assignee: Olympus Corporation
    Inventor: Keisuke Ichikawa
  • Patent number: 9429738
    Abstract: Provided is a zoom lens having, in order from an object: a first lens group (G1) having positive refractive power; a second lens group (G2) having negative refractive power; and a third lens group (G3) having positive refractive power. The first lens group (G1) and the third lens group (G3) respectively move toward the object upon zooming from the wide-angle end state to the telephoto end state. The first lens group (G1) includes a diffraction optical element (DOE) in which two optical elements, constituted by optical materials of which refractive index difference at the d-line is 0.45 or less, are cemented and a diffraction optical surface (corresponding to the optical surface with the radius of curvature R8 in FIG. 1) on which diffraction grating grooves are formed, exists on the interface of the two optical elements. The zoom lens satisfies the following conditional expressions: 0.05<?1/ft<1.00, and 3.0<?d/y<10.
    Type: Grant
    Filed: October 24, 2014
    Date of Patent: August 30, 2016
    Assignee: Nikon Corporation
    Inventor: Kenzaburo Suzuki
  • Patent number: 9395523
    Abstract: A zoom lens consists of, in order from the object side, a positive first group, a negative second group, one or two middle groups including a positive mp group, and a positive rearmost group disposed at the most image-side position of the entire system. Zooming is effected by changing all distances between the adjacent groups. An A cemented lens formed by a positive lens and a negative lens which are cemented together in this order from the object side is disposed at the most object-side position of the second group, a B cemented lens formed by one positive lens and one negative lens is disposed on the image side of the A cemented lens and on the object side of the mp group, and a C cemented lens formed by one positive lens and one negative lens is disposed in the mp group. The zoom lens satisfies given condition expressions.
    Type: Grant
    Filed: August 6, 2015
    Date of Patent: July 19, 2016
    Assignee: FUJIFILM Corporation
    Inventor: Daiki Kawamura
  • Patent number: 9329372
    Abstract: A zoom lens includes, in order from an object side: a negative first lens unit which does not move for zooming; a positive second lens unit which moves during the zooming; a negative third lens unit which moves during the zooming; and a positive fourth lens unit, wherein the following expressions are satisfied: ?0.80<f1/f2<?0.25, ?1.2<f2/f3<?0.4, and 0.5<|m2/m3|<3.0, where f1 represents a focal length of the first lens unit, f2 represents a focal length of the second lens unit, f3 represents a focal length of the third lens unit, m2 represents a moving amount of the second lens unit during the zooming from a wide angle end to a telephoto end, and m3 represents a moving amount of the third lens unit during the zooming from the wide angle end to the telephoto end.
    Type: Grant
    Filed: August 6, 2014
    Date of Patent: May 3, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Kazuya Shimomura
  • Patent number: 9316822
    Abstract: There is provided a zoom lens including 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, the lens groups being arranged in order from an object side to an image side. The second lens group includes a front group having positive refractive power, and a rear group having positive refractive power, the front and rear groups being arranged in order from the object side to the image side. The front group includes a positive lens, a positive lens, a negative lens, and a positive lens, the lenses being arranged in order from the object side to the image side. The rear group includes at least one positive lens.
    Type: Grant
    Filed: April 15, 2013
    Date of Patent: April 19, 2016
    Assignee: Sony Corporation
    Inventor: Masaharu Hosoi
  • Patent number: 9285573
    Abstract: A zoom lens system comprising: a positive first lens unit; a negative second lens unit; a positive third lens unit; and a subsequent lens unit, wherein the first to third lens units move along an optical axis in zooming, a part of the third lens unit is a third-b lens unit moving in a direction perpendicular to the optical axis, and the conditions: 1.5<(D2+D3b+DB)/Ir<2.4, BF/Ir<1.45 and Z=fT/fW>9.0 (D2, D3b: optical axial thicknesses of the second and third-b lens units, DB: an optical axial total thickness of the subsequent lens units, BF: a shortest optical axial distance between an apex of a most image side lens surface and an image surface, Ir=fT×tan(?T), fT, fW: focal lengths of the entire system at a telephoto limit and a wide-angle limit, ?T: a half view angle at a telephoto limit) are satisfied.
    Type: Grant
    Filed: August 16, 2012
    Date of Patent: March 15, 2016
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Takakazu Bito, Shinji Yamaguchi, Yasunori Tochi
  • Patent number: 9274326
    Abstract: A zoom lens system, in order from an object side to an image side, comprising: a first lens unit having negative optical power; a second lens unit having positive optical power; a third lens unit having negative optical power; and a fourth lens unit having positive optical power, wherein the third lens unit is composed of two or less lens elements, the fourth lens unit is composed of two or less lens elements, the first lens unit has at least one air space between lens elements constituting the first lens unit, and the condition: Dair/fW>0.75 (Dair: an air space located on the most object side in the first lens unit, fW: a focal length of the entire system at a wide-angle limit) is satisfied; an imaging device; and a camera are provided.
    Type: Grant
    Filed: April 6, 2012
    Date of Patent: March 1, 2016
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Satoshi Kuzuhara, Yoshio Matsumura
  • Patent number: 9261686
    Abstract: A zoom lens includes first to fourth lens groups having negative, positive, negative, and positive refractive power, respectively, and arranged in order from an object side. The first lens group includes negative lenses. The fourth lens group is configured of one positive lens. A zooming operation from wide end to telephoto end allows the first to third lens groups to travel along an optical axis, and allows the fourth lens group to be fixed. A focusing operation allows the third lens group to travel along the optical axis. The conditional expressions 1<(R1a+R1b)/(R1a?R1b)<5 and 2<(R4a+R4b)/(R4a31 R4b)<7 are satisfied where R1a and R1b are curvature radii on the object side and on the image side of a most-object-sided negative lens in the first lens group, respectively, and R4a and R4b are curvature radii on the object side and on the image side of the positive lens in the fourth lens group, respectively.
    Type: Grant
    Filed: July 31, 2014
    Date of Patent: February 16, 2016
    Assignee: Sony Corporation
    Inventors: Fumikazu Kanetaka, Kodai Nagamatsu
  • Patent number: 9261681
    Abstract: A zoom lens includes, in order from an object side to an image side, first to fourth lens units having negative, positive, negative, and positive refractive power, respectively. During zooming from a wide-angle end to a telephoto end, at least the first, second, and third lens units move. The focal lengths of the first, second, and third lens units, the amount of movement of the second lens unit during zooming from the wide-angle end to the telephoto end, a lateral magnification at the wide-angle end of the second lens unit, a lateral magnification at the wide-angle end of the third lens unit, a lateral magnification at the telephoto end of the second lens unit, and the lateral magnification at the telephoto end of the third lens unit are appropriately set.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: February 16, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventor: Shin Kuwashiro
  • Patent number: 9261682
    Abstract: A zoom lens comprises a first lens unit G1 having a positive refractive power, a second lens unit G2 having a negative refractive power, a third lens unit G3 having a positive refractive power, a fourth lens unit G4 having a negative refractive power, a fifth lens unit G5, and a sixth lens unit G6 having a positive refractive power. Zooming from a wide angle end to a telephoto end is carried out by changing a distance between the lens units, and a distance between the first lens unit G1 and the third lens unit G3 narrows at the telephoto end than at the wide angle end, and the first lens unit G1 is stationary at the time of zooming from the wide angle end to the telephoto end, and lens units from the second lens unit G2 to the fifth lens unit G5 move.
    Type: Grant
    Filed: February 4, 2014
    Date of Patent: February 16, 2016
    Assignee: OLYMPUS CORPORATION
    Inventors: Yasuji Ogata, Hirohiko Kimata
  • Patent number: 9244251
    Abstract: A wide-angle photographic lens system enabling correction of distortion composed of four lenses, in which a first lens, an iris, a second lens, a third lens and a fourth lens sequentially arranged along an optical axis from an object, wherein the first lens has weak refractivity, the second lens has positive refractivity, the third lens has strong positive refractivity, and the fourth lens has negative refractivity, wherein the lens system satisfies relations, |f1/f|>4, f3/f<1.5, and te/tc<0.5, wherein f1 is a focal length of the first lens, f is a total focal length of all the lenses, f3 is a focal length of the third lens, to is a lens thickness on an effective diameter of a rear surface of the third lens, and tc is a center thickness of the third lens.
    Type: Grant
    Filed: December 19, 2013
    Date of Patent: January 26, 2016
    Assignee: Sekonix Co., Ltd.
    Inventors: Soon Chul Choi, Seung Nam Nam, Ki Youn Noh
  • Patent number: 9223119
    Abstract: A zoom lens includes a first lens unit having a negative refractive power, 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, disposed in order from an object side to an image side, and an aperture stop between a lens surface closest to the object side of the second lens unit and a lens surface closest to the object side of the third lens unit, the third lens unit is moved to the image side during a focusing operation from an infinite object to a short distance object, the first lens unit is configured by at most two negative lenses and one positive lens, the third lens unit is configured by a single lens or a cemented lens, and an appropriate conditional expression are met.
    Type: Grant
    Filed: November 26, 2012
    Date of Patent: December 29, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshihisa Tashiro, Yasuaki Hagiwara
  • Patent number: 9213173
    Abstract: A zoom lens system includes a negative first lens group, a positive second lens group, a negative third lens group, and a positive fourth lens group. Upon zooming from the short to the long focal length extremities, the distance between the first and second lens groups decreases, the distance between the second and third lens groups increases, and the distance between the third and fourth lens groups decreases. The following conditions (1) and (2) are satisfied: ?2.50<f1/f2<?1.57??(1), and f3/f3B<?0.1??(2), wherein f1, f2 and f3 designate the focal lengths of the first, second and third lens groups, respectively, and f3B designates the focal length of a bonding surface in the cemented lens of the third lens group.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: December 15, 2015
    Assignee: RICOH IMAGING COMPANY, LTD.
    Inventor: Masakazu Saori
  • Patent number: 9213172
    Abstract: A zoom lens unit comprises a first and fourth lens groups with positive refractive power, a second and third lens groups with negative refractive power. The first and the fourth lens groups are fixed, the second lens group moves toward an image side and the fourth lens group moves when changing a magnification ratio from a wide-angle end to a telephoto end. The fourth lens group includes a positive lens L41 having a convex surface on the object side, a negative lens L42 having a concave surface on an image side, positive lenses L43, L45, and a negative lens L44. A following condition is fulfilled: 0.1<(R411?R422)/(R411+R422)<0.6 where R411 represents a curvature radius of the object-side surface of the positive lens L41, and R422 represents a curvature radius of the image-side surface of the negative lens L42.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: December 15, 2015
    Assignee: RICOH COMPANY, LTD.
    Inventor: Yoshifumi Sudoh
  • Patent number: 9195032
    Abstract: A zoom lens with a bent optical path includes, in order from the object side to the image side, a first lens unit including the reflecting member and having a negative refractive power, 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. During zooming from the wide angle end to the telephoto end, the second lens unit moves closer to the first lens unit only toward the object side, the third lens unit moves in such a way that it becomes closest to the second lens unit at an intermediate focal length position in the course of zooming as compared to the state at the wide angle end and the state at the telephoto end, and the fourth lens unit moves. The zoom lens satisfies a certain condition.
    Type: Grant
    Filed: June 25, 2012
    Date of Patent: November 24, 2015
    Assignee: OLYMPUS CORPORATION
    Inventors: Kenji Ono, Tetsuya Yanai, Masato Katayose
  • Patent number: 9151936
    Abstract: The invention relates to an optical inspecting system designed to image an object to be inspected with a variable imaging scale, comprising a variation system for imaging the object into infinity, a lens group downstream of the variation system for imaging the object from infinity into the image plane of the whole system, and a light source for generating light in order to illuminate the object, means for imaging the illuminating light into the exit pupil of the variation system being provided in the airspace between the fifth lens group and the subsequent lens group. Of the five lens groups of the variation system, the first, second, and fourth lens groups, when seen in the imaging direction, are arranged in a movable manner in the direction of the optical axis, whereas the third and fifth lens groups are not movable.
    Type: Grant
    Filed: November 7, 2011
    Date of Patent: October 6, 2015
    Assignee: Carl Zeiss Microscopy GmbH
    Inventors: Rolf Wartmann, Kerstin Winkler, Joerg Sprenger
  • Patent number: 9122042
    Abstract: A zoom lens including a first lens group, a second lens group, a third lens group, and a fourth lens group with positive, negative, positive, and positive refractive powers respectively arranged in sequence from an object side to an image side is provided. The first lens group includes a first lens and a second lens. The second lens group includes a third lens, a fourth lens, and a fifth lens. The third lens group includes a sixth lens. The fourth lens group includes a seventh lens, an eighth lens, and a ninth lens. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens respectively having negative, positive, negative, negative, positive, positive, positive, negative, and positive refractive powers are arranged in sequence from the object side to the image side.
    Type: Grant
    Filed: December 19, 2013
    Date of Patent: September 1, 2015
    Assignee: Young Optics Inc.
    Inventors: Yuan-Long Cai, Chien-Hsiung Tseng, Yu-Hung Chou
  • Patent number: 9063322
    Abstract: A zoom lens includes: a first lens group having a positive power; a second lens group having a negative power; a third lens group having a positive power; and a fourth lens group having a negative power, in this order from an object side. All of the groups move along an optical axis such that the distance between the first group and the second group gradually becomes greater, the distance between the second group and the third group gradually becomes smaller, and the distance between the third group and the fourth group gradually becomes greater, when changing magnification from a wide angle to a telephoto end. The zoom lens satisfies the conditional formulae: ?2.0<fw/f2<?0.8; and ?1.0<fw/f4<?0.2, wherein fw is the focal length of the entire system at the wide angle end, f2 is the focal length of the second group, and f4 is the focal length of the fourth group.
    Type: Grant
    Filed: December 13, 2013
    Date of Patent: June 23, 2015
    Assignee: FUJIFILM CORPORATION
    Inventor: Michio Cho
  • Patent number: 9036267
    Abstract: A zoom lens includes a first lens-group having positive refractive power, a second lens-group having negative refractive power, a third lens-group having positive refractive power, and a fourth lens-group having positive refractive power, in this order from an object side, and a stop located between a most image-side surface of the second lens-group and a most image-side surface of the third lens-group. Distances between the lens-groups change when magnification is changed from a wide-angle end to a telephoto end. The second lens-group consists of a negative lens, a biconcave lens and a positive lens in this order from the object side. The third lens-group consists of a positive lens, a cemented lens of a positive lens and a negative lens, a negative meniscus lens with its concave surface facing the object side, and a biconvex lens in this order from the object side. A predetermined conditional formula is satisfied.
    Type: Grant
    Filed: January 22, 2014
    Date of Patent: May 19, 2015
    Assignee: FUJIFILM CORPORATION
    Inventors: Taiga Noda, Michio Cho
  • 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: 9030753
    Abstract: A zoom lens includes, in order from the object side, a negative first lens group, a positive second lens group and a positive third lens group, wherein, during magnification change from the wide-angle end to the telephoto end, at least the first and second lens groups are moved such that the interval between the first and second lens groups decreases and the interval between the second and third lens groups increases. The first lens group includes a negative meniscus first-group first lens with a convex object-side surface, a negative meniscus first-group second lens with a convex object-side surface, and a positive first-group third lens with a convex object-side surface, and the second lens group includes a positive lens, a cemented lens formed by a positive lens and a negative lens, a positive lens and a negative lens, in order from the object side. The zoom lens satisfies given conditional expressions.
    Type: Grant
    Filed: June 6, 2014
    Date of Patent: May 12, 2015
    Assignee: FUJIFILM Corporation
    Inventors: Taiga Noda, Michio Cho