Reverse Telephoto Patents (Class 359/680)
  • Patent number: 10330898
    Abstract: An imaging optical system of the present invention includes first and second optical elements arranged in order from an object side and an aperture stop. Each of the first and second optical elements includes an aspherical surface which is rotationally asymmetric with respect to an optical axis. A curvature of the aspherical surface in a first cross section including the optical axis changes from the optical axis in a first direction perpendicular to the first cross section. A total length of the imaging optical system, a distance between the aspherical surface closest to the object side and the aperture stop, and Abbe numbers of the first and second optical elements are appropriately set.
    Type: Grant
    Filed: April 4, 2017
    Date of Patent: June 25, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Takayuki Sugiyama
  • Patent number: 10330901
    Abstract: The zoom lens according to the present invention includes, in order from an object side to an image side, a negative first lens unit, an aperture stop, a positive second lens unit, and a positive rear lens group. The rear lens group includes a negative lens unit LN and a positive lens unit LP. During zooming, the first lens unit does not move, the second lens unit moves so as to be closer to object side at a telephoto end (TE) than at a wide-angle end (WE), the lens unit LP moves so as to be closer to image side at TE than at WE, and an interval between every adjacent two of lens units changes. Focal lengths of second lens unit and lens unit LP, and an amount by which each of second lens unit and lens unit LP moves for zooming from WE to TE are appropriately set.
    Type: Grant
    Filed: November 6, 2017
    Date of Patent: June 25, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Shin Kuwashiro
  • Patent number: 10302898
    Abstract: An imaging lens system includes first and second lens groups each having a positive optical power (P1, P2) and a third lens group. During focusing, the second lens group moves. When the first lens group is divided into two groups across, as a boundary, the longest aerial distance (t1) among the axial lens-to-lens distances located on the image side of the position of half the total length of the first lens group, the object-side group being a front group and the image-side group being a rear group, the most image-side surface in the front group and the most image-side surface in the rear group are lens surfaces concave to the image side. The conditional formulae 0.2<P1/P<0.6, 0.3<P1/P2<0.9, 0.03<t1/t<0.1, and 0.05<t2/t<0.14 are fulfilled (P, the optical power of the entire system; t2, the aerial distance between the first and second lens groups in the infinity-object-distance condition; t, the total length of the system.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: May 28, 2019
    Assignee: KONICA MINOLTA, INC.
    Inventor: Yasunari Fukuta
  • Patent number: 10295890
    Abstract: The zoom lens (1) includes an aperture stop (ST1), at least three front side movable lens units (B2 to B4) disposed on an enlargement conjugate side further than the aperture stop and movable for zooming, and a front side fixed lens unit (B1) disposed on the enlargement conjugate side further than the at least three front side movable lens units and fixed for the zooming. The at least three front side movable lens units include two first front side movable lens units (B2 and B3) movable to the enlargement conjugate side for zooming from a wide-angle end to a telephoto end, and a second front side movable lens unit (B4) disposed on the reduction conjugate side further than the first front side movable lens units and movable to the reduction conjugate side for the zooming from the wide-angle end to the telephoto end.
    Type: Grant
    Filed: July 2, 2018
    Date of Patent: May 21, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Makoto Takahashi
  • Patent number: 10295780
    Abstract: The imaging lens consists of a positive first lens group remaining stationary during focusing, a negative second lens group, a positive third lens group, and a negative fourth lens group remaining stationary during focusing, in order from an object side. During focusing from the infinite object to the closest object, the second lens group moves to an image side, the third lens group moves to the object side, and the fourth lens group consists of a fourth-a lens group which is a vibration-proof lens group and a fourth-b lens group, in order from the object side. In the imaging lens, predetermined conditional expressions are satisfied.
    Type: Grant
    Filed: February 27, 2018
    Date of Patent: May 21, 2019
    Assignee: FUJIFILM Corporation
    Inventors: Ryoko Tomioka, Daiki Kawamura
  • Patent number: 10281682
    Abstract: An optical imaging system includes a first lens group having a first group of lenses. A foremost lens of the first group of lenses is a lens closest to an object side and has a positive refractive power. The optical imaging system also includes a second lens group having a second group of lenses. A rearmost lens of the second group of lenses is a lens closest to an imaging plane and has convex surfaces. The first and second lens groups are sequentially disposed from the object side to an imaging plane. An expression TL/f1<2.0 is satisfied, where TL represents a distance from an object-side surface of the foremost lens to the imaging plane and f1 represents a focal length of the foremost lens.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: May 7, 2019
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Tae Youn Lee, Yong Joo Jo
  • Patent number: 10197767
    Abstract: A five-piece wide-angle lens module includes, from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens has negative power, a convex surface on the object side and a concave surface on the image side. The second lens, the third lens and the fifth lens all have positive power and two convex surfaces on both sides. The fourth lens has negative power and two concave surfaces on both sides. The five-piece wide-angle lens module further satisfies the following relationship: 30?(T5+T7+T9)/(T6+T8+T10)?10. Thereby, the incident light can have smaller refraction angle when transmitting through the lenses, and thus the five-piece wide-angle lens module can be provided with characteristics of low manufacturing sensitivity, wide angle, low distortion, high photosensitivity efficiency and high image quality.
    Type: Grant
    Filed: August 22, 2016
    Date of Patent: February 5, 2019
    Assignee: KINKO-OPTICAL CO., LTD
    Inventor: Yi-Chih Lin
  • Patent number: 10191251
    Abstract: An optical lens includes a first lens group with negative refractive power, a second lens group with positive refractive power, and an aperture stop disposed between the first lens group and the second lens group. A number of lenses with refractive power of the first lens group is smaller than three, and a number of lenses with refractive power of the second lens group is smaller than five. The second lens group has a lens with a diffractive optical surface, and the lens with a diffractive optical surface satisfies the condition: 0<|(?d*V)/?r|<2, where ?d denotes refractive power of the diffractive optical surface, ?r denotes refractive power of the lens, and V denotes an Abbe number of the lens with a diffractive optical surface.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: January 29, 2019
    Assignee: RAYS OPTICS INC.
    Inventor: Sheng-Tang Lai
  • Patent number: 10185131
    Abstract: A zoom lens includes in order from an object side, 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, and at the time of zooming, movement of the first lens unit includes at least a movement toward an image side, the second lens unit moves integrally with an aperture stop, and the third lens unit moves toward the object side, and the first lens unit includes at least a negative lens and a positive lens, and the negative lens is disposed nearest to an object, and the following conditional expressions are satisfied: 0.75<(?2t/?2w)/(?3t/?3w)<1.38 ?0.70<?2w<?0.32 0.96<f2/fw<1.80.
    Type: Grant
    Filed: January 28, 2016
    Date of Patent: January 22, 2019
    Assignee: OLYMPUS CORPORATION
    Inventors: Takashi Fujikura, Keisuke Takada, Keisuke Ichikawa
  • Patent number: 10168514
    Abstract: The zoom lens consists of, in order from the object side, a first lens group that has a positive refractive power and remains stationary during zooming, a plurality of movable lens groups that move during zooming, and a final lens group that has a positive refractive power and remains stationary during zooming. The first lens group consists of, in order from the object side, a first lens group front group that has a negative refractive power and remains stationary during focusing, a first lens group intermediate group that has a positive refractive power and moves during focusing, and a first lens group rear group that has a positive refractive power. The first lens group front group has, successively in order from a position closest to the object side, a negative meniscus lens that is concave toward the image side and a negative lens.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: January 1, 2019
    Assignee: FUJIFILM Corporation
    Inventors: Masaru Yonezawa, Takuya Tanaka
  • Patent number: 10156708
    Abstract: First through third lens groups constituting a projection zoom lens can be configured as a zoom lens of the type in which the first and second lens groups, for example, are moved when zooming, and the first lens group, for example, is moved when focusing. Further, by fulfilling the conditional formula (1), it is possible to achieve that the back focus is prevented from becoming too short, and the back focus is prevented from becoming too long while ensuring the sufficient space on the reduction side, and the lens diameter on the reduction side is prevented from becoming too large in the case of adopting a roughly telecentric configuration on the reduction side.
    Type: Grant
    Filed: October 6, 2017
    Date of Patent: December 18, 2018
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Nobutaka Minefuji
  • Patent number: 10146032
    Abstract: The zoom lens consists of, in order from the object side, a first lens group that has a positive refractive power and remains stationary during zooming, a plurality of movable lens groups that move during zooming, and a final lens group that has a positive refractive power and remains stationary during zooming. The final lens group has two or more positive ED lenses formed of a material satisfying predetermined conditional expressions. The predetermined conditional expressions, which relate to extraordinary low dispersion and temperature coefficients of the refractive indices of the positive lenses in the movable lens group closest to the image side and the final lens group, are satisfied.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: December 4, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Masaru Yonezawa, Takuya Tanaka
  • Patent number: 10139590
    Abstract: Provided are an imaging lens, which has a small F number and in which various aberrations are satisfactorily corrected, and an imaging apparatus including the imaging lens. The imaging lens includes, in order from an object side: a first lens that has a biconcave shape; a second lens that is convex toward an image side and has a positive refractive power; a third lens that has a biconvex shape; a fourth lens that has a negative refractive power; a fifth lens that has a positive refractive power; and a sixth lens that has a negative refractive power. Assuming that L1f and L1r are paraxial radii of curvature of an object side surface and an image side surface of the first lens, Conditional Expression (1) is satisfied. 0.1<(L1f+L1r)/(L1f?L1r)<0.
    Type: Grant
    Filed: September 22, 2017
    Date of Patent: November 27, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Ryoko Otomo, Michio Cho
  • Patent number: 10139600
    Abstract: The imaging lens includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power. During focusing, only the second lens group moves in the direction of the optical axis. A lens closest to the object side in the first lens group and a lens adjacent to the lens on the image side have positive refractive powers, and the second lens group includes two or three lenses. Further, predetermined Conditional Expressions (1), (2), (3a), and (3b) are satisfied.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: November 27, 2018
    Assignee: FUJIFILM Corporation
    Inventor: Masato Kondo
  • Patent number: 10114201
    Abstract: A zoom lens system includes, in the following order from an object side toward an image side, a first lens group with negative power, a second lens group with positive power, a third lens group with negative power, and a fourth lens group with positive power. The first lens group includes, in the following order from the object side toward the image side, a first lens element having a negative meniscus shape with a concave surface facing the image side, a second lens element having a negative meniscus shape with a concave surface facing the image side, a third lens element with a concave surface facing the image side, a fourth lens element with a convex surface facing the object side, and a fifth lens element with a concave surface facing the object side. The third lens element and the fourth lens element compose a cemented lens.
    Type: Grant
    Filed: March 21, 2017
    Date of Patent: October 30, 2018
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Isamu Izuhara, Naoto Nishimura
  • Patent number: 10095012
    Abstract: A zoom lens system comprising, in order from an object side: a first lens group G1 having negative refractive power; and a second lens group G2 having positive refractive power, a distance between the first lens group and the second lens group varying upon zooming from a wide-angle end state to a telephoto end state, the first lens group G1 including, in order from the object side, a first lens component having negative refractive power, a second lens component having negative refractive power, a third lens component having positive refractive power, and a fourth lens component having positive refractive power, thereby providing a downsized zoom lens system having excellent optical performance, an optical apparatus equipped therewith and a method for manufacturing the zoom lens system.
    Type: Grant
    Filed: June 25, 2015
    Date of Patent: October 9, 2018
    Assignee: Nikon Corporation
    Inventor: Akira Yamagami
  • Patent number: 9983389
    Abstract: Disclosed are an optical lens assembly and an electronic apparatus including the disclosed lens assembly. The optical lens assembly includes a first lens group having positive refractive power, an iris diaphragm, and a second lens group having positive refractive power, which are arranged from an object side to an image side of an optical axis, the object side facing an object for image capture and the image side facing an imaging surface of an image sensor. The first lens group includes a first air lens having negative refractive power and a convex surface facing the object side and a second air lens having negative refractive power and two convex surfaces. The second lens group includes a lens closest to the image side of the optical axis that has positive refractive power and a convex surface facing the image side. The closest image-side lens includes an aspherical surface. The optical lens assembly has a maximum viewing angle of 130 degrees or more.
    Type: Grant
    Filed: February 7, 2017
    Date of Patent: May 29, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Tae-kun Lee
  • Patent number: 9983392
    Abstract: A projection zoom lens includes, sequentially from an enlargement conjugate side: a first lens group having negative refractive power; a second lens group having positive or negative refractive power; a third lens group having positive refractive power; a fourth lens group having negative refractive power; a fifth lens group having positive refractive power; and a sixth lens group having positive refractive power, and configured to perform a magnification variation by changing the interval between the respective lens groups, wherein the fourth lens group includes at least one positive lens and at least one negative lens, at least one of the positive lenses included in the fourth lens group satisfies the following Conditional Expressions: 0.71??g_Fp+0.004×?dp?0.73 and 15??dp?25, and the back focus of the entire projection zoom lenses satisfies the following Conditional Expression 1.0?BF/Fw?2.7.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: May 29, 2018
    Assignee: KONICA MINOLTA, INC.
    Inventors: Kazuhiko Inoue, Yusuke Imai
  • Patent number: 9977227
    Abstract: A zoom lens includes in order from an object side to an image side, 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 a distance between the first lens unit and the second lens unit at a wide angle end, and an aperture stop is disposed on an image side of an image-side surface of the first lens unit, and on an object side of an image-side surface of the second lens unit, and the zoom lens satisfies the conditional expressions.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: May 22, 2018
    Assignee: OLYMPUS CORPORATION
    Inventors: Kazuteru Kawamura, Akiko Naito, Keitaro Yokoyama, Toshio Takahashi
  • Patent number: 9958655
    Abstract: A projection lens system includes a first lens group including a 1a-th lens group having a negative refractive power, a 1b-th lens group having a positive or negative refractive power, and a 1c-th lens group having a positive or negative refractive power. During a zoom, the first lens group remains stationary on an optical axis. During a focus from a remote distance side to a close distance side, the 1a-th lens group remains stationary on the optical axis while the 1b-th and 1c-th lens groups move toward the enlargement conjugate side along different loci respectively. Conditional formula ?4.7<fl/fw<?2.5 is fulfilled at both the remote and close distance sides, where fl represents a focal length of the first lens group, and fw represents a focal length of the entire system at a wide-angle end.
    Type: Grant
    Filed: September 14, 2016
    Date of Patent: May 1, 2018
    Assignee: Konica Minolta, Inc.
    Inventors: Yusuke Imai, Kazuhiko Inoue
  • Patent number: 9927684
    Abstract: A projection optical system projects onto a projection surface an image ray bundle formed on an image display element, and includes a transmissive optical system positioned on a side of an emission surface of the image display element and having positive power, and a reflective optical system including at least one mirror for reflecting, toward the projection surface, light rays emitted from the transmissive optical system. The transmissive optical system includes at least one positive lens disposed closer to the image display element than an aperture stop, along with first and second positive lenses having a meniscus shape, and a negative lens disposed therebetween, which are closer to the projection surface than the aperture stop is. During focusing, spacing between the first positive lens and the negative lens and spacing between the second positive lens and the negative lens remain unchanged.
    Type: Grant
    Filed: March 21, 2017
    Date of Patent: March 27, 2018
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Tsuneo Uchida, Katsu Yamada
  • Patent number: 9915811
    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, in that order from the object side. Upon zooming from the short to long focal length extremities, at least the first lens group, the second lens group and the fourth lens group are moved in the optical axis direction. The third lens group includes a negative first sub-lens group and a negative second sub-lens group, in that order from the object side. The second sub-lens group is provided with a negative single lens element and a positive single lens element, wherein an air lens is formed between the negative single lens element and the positive single lens element.
    Type: Grant
    Filed: October 27, 2014
    Date of Patent: March 13, 2018
    Assignee: RICOH IMAGING COMPANY, LTD.
    Inventor: Tatsuyuki Onozaki
  • Patent number: 9904044
    Abstract: A zoom lens, including, in order from an object side: a negative first unit being not moved for zooming; a second unit including at least one sub-unit that is moved during zooming, and having a positive refractive power as a whole; a negative third unit including an aperture stop, being not moved for zooming; a fourth unit including at least one sub-unit and being moved during zooming; and a fifth unit being not moved for zooming, at least three sub-units among the sub-units included in the second and fourth units being moved during zooming, in which focal lengths of the first and third units, and a movement amount of a sub-unit that is moved most in the second unit and a movement amount of a sub-unit that is moved most in the fourth unit during zooming from a wide angle end to a telephoto end satisfy predetermined conditions.
    Type: Grant
    Filed: October 19, 2016
    Date of Patent: February 27, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shohei Kikuchi, Shoichi Takemoto
  • Patent number: 9897780
    Abstract: An optical imaging lens includes a first lens element, a second lens element, a third lens element, and a fourth lens element from an object side to an image side in order along an optical axis. The first lens element to the fourth lens element each include an object-side surface and an image-side surface. The first lens element has positive refracting power. The second lens element has negative refracting power. At least one of the object-side surface and the image-side surface of the third lens element is an aspheric surface. At least one of the object-side surface and the image-side surface of the fourth lens element is an aspheric surface. A maximum distance between the image-side surface of the first lens element and the object-side surface of the second lens element in a direction parallel to the optical axis is less than 0.2 mm.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: February 20, 2018
    Assignee: GENIUS ELECTRONIC OPTICAL (XIAMEN) CO., LTD.
    Inventors: Matthew Bone, Maozong Lin, Zhenfeng Xie
  • Patent number: 9897788
    Abstract: An optical system includes an aperture stop, a unit A configured to move during a distortion adjustment, and a unit B disposed at an image side relative to the unit A and configured to move with a locus different from a locus of the unit A during the distortion adjustment, the optical system changes from a first optical state having a first distortion to a second optical state having a second distortion larger than the first distortion, and focal lengths of the units A and B, moving amounts of the units A and B during a change from the first to second optical states, distances from the aperture stop to the units A and B, distances from a lens surface of the unit A closest to the object side to an image plane, and a total optical length of the optical system satisfy a predetermined condition.
    Type: Grant
    Filed: October 13, 2015
    Date of Patent: February 20, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yuichi Gyoda
  • Patent number: 9864177
    Abstract: An optical system includes a reflective optical system on a magnification side along an optical path of the projection optical system and a refractive optical system on a reduction side along the optical path. The reflective optical system includes one reflective optical element having a power. The refractive optical system includes a front group on the magnification side and a rear group on the reduction side. The front group having, in order from the magnification side toward the reduction side, a first lens group with a positive or negative refractive power, a second lens group, and a third lens group with a positive refractive power. The rear group has a positive refractive power. The first lens group moves to the magnification side, and the second lens group and the third lens group move to the reduction side in a change in focus from a long distance to a short distance.
    Type: Grant
    Filed: August 8, 2016
    Date of Patent: January 9, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Yohei Takano, Hibiki Tatsuno, Yasuyuki Shibayama
  • Patent number: 9835835
    Abstract: A projection zoom lens assembly for a digital cinema projection system includes three optical groups. A first optical group includes one or more wide angle lenses for projecting digital cinema images. A second optical group includes a set of zoom optical groups each comprising two or more lenses, including a first independently movable zoom group, a second independently movable zoom group, and a third zoom group. A third optical group includes multiple lenses for receiving images for projection.
    Type: Grant
    Filed: April 11, 2016
    Date of Patent: December 5, 2017
    Assignee: Navitar Industries, LLC
    Inventors: Russell Hudyma, Michael Thomas, Arash Ghorbani
  • Patent number: 9753263
    Abstract: A zoom lens system includes: a first lens group having a negative refractive power; a second lens group having a positive refractive power; and an aperture between the first and second lens groups, wherein the first lens group and the second lens group are sequentially arranged from an object side to an image side, wherein the zoom lens system performs zooming and focusing by moving the second and first lens groups, respectively, along an optical axis, and satisfies 2.5<(fw/ft)×(Tw/Y)<4.5, where fw denotes an entire focal length at a wide-angle end, ft denotes an entire focal length at a telephoto end, and Tw denotes a distance between an image plane and an object side lens surface of a lens closest to the object side of the first lens group at the wide-angle end, and Y denotes a radical axis image height.
    Type: Grant
    Filed: September 16, 2015
    Date of Patent: September 5, 2017
    Assignee: Hanwha Techwin Co., Ltd.
    Inventor: Jiyeong Yoo
  • Patent number: 9746648
    Abstract: A four-piece infrared single wavelength lens system includes, in order from the object side to the image side: a first lens element with a refractive power, a stop, a second lens element with a positive refractive power, a third lens element with a positive refractive power, and a fourth lens element with a positive refractive power. The focal length of the first lens element is f1, the focal length of the second lens element and the third lens element combined is f23, and they satisfy the relation: ?210<f1/f23<365. When the above relation is satisfied, a wide field of view can be obtained and the resolution can be improved evidently.
    Type: Grant
    Filed: February 11, 2016
    Date of Patent: August 29, 2017
    Assignee: NEWMAX TECHNOLOGY CO., LTD.
    Inventors: Fei-Hsin Tsai, Chun-Sheng Lee
  • Patent number: 9726867
    Abstract: A variable magnification optical system consists of a first lens-group having negative refractive-power, a stop and a second lens-group having positive refractive-power in this order from an object-side. The first lens-group includes an L11 negative meniscus lens, an L12 negative lens and a C11 cemented lens, in which a biconcave lens and a positive lens are cemented together in this order from the object-side, in this order from the object-side. The second lens-group includes an L21 positive lens that is arranged closest to the object-side and includes at least one aspheric surface, and an object-side surface of which is convex, and only two cemented lenses toward an image-side of the L21 positive lens, and each of which consists of a negative lens and a positive lens cemented together in this order from the object-side. The following conditional expressions (1) and (2) are satisfied: ?1.0<Rf11/Rf12<0.7??(1); and 55.0<?dave1??(2).
    Type: Grant
    Filed: May 11, 2015
    Date of Patent: August 8, 2017
    Assignee: FUJIFILM Corporation
    Inventor: Ukyo Tomioka
  • Patent number: 9726863
    Abstract: A wide angle zoom lens includes sequentially from the object side, a first lens group having a negative refractive power overall and three lenses, including first to third lenses, having a negative refractive power and disposed farthest on the object side; a second lens group having a positive refractive power overall and one or more sets of cemented lenses; and a third lens group having a negative refractive power. This ultra wide angle zoom lens varies intervals between the first lens group, the second lens group, and the third lens group on the optical axis to zoom from the wide angle end to the telephoto end and satisfies given conditions to thereby enable a high zoom ratio, large diameter, and high resolution.
    Type: Grant
    Filed: August 19, 2015
    Date of Patent: August 8, 2017
    Assignee: TAMRON CO., LTD.
    Inventors: Takayuki Noda, Takahiro Mitsuhashi, Seigou Nakai
  • Patent number: 9690080
    Abstract: A wide angle lens may include a first lens having a negative power with a convex surface on an object side and a concave surface on an image side, a second lens having a negative power with a concave surface on the image side, a third lens having a positive power with a convex surface on the image side, a fourth lens having a positive power with a convex surface on the image side, a fifth lens being a plastic lens with a negative power with a concave surface on the object side and a concave surface on the image side, a sixth lens being a plastic lens with a positive power with a convex surface on the object side and a convex surface on the image side, and a diaphragm disposed between the third and fourth lenses. The fifth and sixth lenses constitute a cemented lens.
    Type: Grant
    Filed: August 12, 2015
    Date of Patent: June 27, 2017
    Assignee: NIDEC SANKYO CORPORATION
    Inventor: Tadashi Komiyama
  • Patent number: 9684157
    Abstract: A projection zoom lens includes: a first lens group having a negative refractive power provided most toward the magnification side, which is fixed when changing magnification; and at least two movable lens groups that move to change the relative distance therebetween in the direction of an optical axis when changing magnification. The first lens group is constituted by, in order from the magnification side to the reduction side, a front group having a negative refractive power and a rear group having a negative refractive power. The front group is fixed and only the rear group moves in the direction of the optical axis during focusing operations. Conditional Formula (1) related to the focal length f1a of the front group and the focal length f1b of the rear group is satisfied: f1b/f1a<0.8??(1).
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: June 20, 2017
    Assignee: FUJIFILM Corporation
    Inventor: Yukiko Nagatoshi
  • Patent number: 9678412
    Abstract: A zoom lens is a projection lens which is composed of a negative first lens group, a negative second lens group, a positive third lens group, a negative fourth lens group, a fifth lens group, and a positive sixth lens group in order from the enlargement conjugate side, and changes magnification by changing the intervals between the lens groups. At least the second, third, and fifth lens groups move when the magnification is changed, and the third lens group moves from the enlargement conjugate side to the reduction conjugate side when the magnification is changed from a telephoto end to a wide angle end. An aperture stop is disposed between the surface closest to the reduction conjugate side of the third lens group and the surface closest to the enlargement conjugate side of the fifth lens group, and is approximately telecentric on the reduction conjugate side.
    Type: Grant
    Filed: December 25, 2013
    Date of Patent: June 13, 2017
    Assignee: Konica Minolta, Inc.
    Inventors: Yusuke Imai, Kazuhiko Inoue
  • Patent number: 9638902
    Abstract: The projection zoom lens essentially consists of a positive first lens group fixed while changing magnification and the second lens group through the fourth lens group which move while changing magnification, and a fifth lens group fixed while changing magnification; and an aperture stop positioned between adjacent moving lens groups or within one moving lens group, wherein the numerical number of the zoom lens is set to be constant over the entire zoom range, the reduction side is configured to be telecentric, and the projection zoom lens satisfies conditional formulas (4) and (5): 2.0<Bf/Im???(4) L/Im?<12??(5), where, Bf: the back focus (air converted length) at the reduction side of the entire system at the wide angle end, Im?: the maximum effective image circle diameter, and L: the distance between the most-magnification-side lens surface and the most-reduction-side lens surface along the optical axis when the projection distance is infinite.
    Type: Grant
    Filed: May 15, 2015
    Date of Patent: May 2, 2017
    Assignee: FUJFILM Corporation
    Inventor: Yukiko Nagatoshi
  • Patent number: 9632290
    Abstract: A wide-angle lens system includes a first lens group, an aperture stop, and a second lens group having positive optical power. The first lens group includes, at least, a first lens element that has a meniscus shape convex on the object side, and has negative optical power, a second lens element that has a meniscus shape convex on the object side, and has negative optical power, a third lens element that is concave on the image side and has negative optical power, and a posterior lens element. The second lens element is an aspherical lens, and the second lens element satisfies a conditional expression: 0.3<(R21?R22)/(R21+R22)<0.8 where R21 is a radius of paraxial curvature on the object side of the second lens element, and R22 is a radius of paraxial curvature on the image side of the second lens element.
    Type: Grant
    Filed: September 9, 2015
    Date of Patent: April 25, 2017
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Naoto Nishimura, Isamu Izuhara
  • Patent number: 9575297
    Abstract: A projection lens 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, a fourth lens group having negative refractive power, a fifth lens group having positive refractive power, and a sixth lens group having positive refractive power, in sequence from an enlargement conjugate side, the projection lens performing magnification by changing the spacing between the lens groups, wherein at the time of magnification from the telephoto end to the wide-angle end, the second, third, fourth, and fifth lens groups are moved, and an aperture stop is arranged between the surface of the third lens group closest to a reduction conjugate side and the surface of the fifth lens group closest to the enlargement conjugate side.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: February 21, 2017
    Assignee: Konica Minolta, Inc.
    Inventors: Yusuke Imai, Kazuhiko Inoue
  • Patent number: 9557539
    Abstract: A fixed focal-length lens system includes a negative first lens group, a positive second and third lens groups. The first and second lens groups move toward the object side during focusing from an object at infinity to an object at a close-up distance. The first lens group includes a negative lens element having a concave surface on the image side, at least two positive lens elements, and a negative lens element having a concave surface on the image side. The second lens group includes a negative lens element having a concave surface on the object side, and at least two positive lens elements. The third lens group includes at least one negative lens element, and at least one positive lens element. The following condition (1) is satisfied: ?0.3<fG2/fG1<?0.05??(1), wherein fG1 and fG2 designate the focal lengths of the first and second lens groups.
    Type: Grant
    Filed: May 1, 2014
    Date of Patent: January 31, 2017
    Assignee: RICOH IMAGING COMPANY, LTD.
    Inventor: Yoichi Nomura
  • Patent number: 9541743
    Abstract: A projection zoom lens is constituted by: a negative first lens group; a positive moving second lens group; a positive moving third lens group; a positive final lens group; at least one lens group positioned between the final lens group and the third lens group; and an aperture stop provided between adjacent moving lens groups. The aperture stop is a variable stop, of which the aperture diameter changes such that the numerical aperture of the zoom lens becomes constant. The zoom lens satisfies Conditional Formulae below: 2.8<Bf/Im???(1?) L/Im?<12??(2) wherein Bf is the back focus of the entire system at the reduction side at the wide angle end, Im? is the maximum effective image circle diameter at the reduction side, and L is the distance from the lens surface most toward the magnification side to the lens surface most toward the reduction side when the projection distance is infinity.
    Type: Grant
    Filed: May 14, 2015
    Date of Patent: January 10, 2017
    Assignee: FUJIFILM Corporation
    Inventors: Masaru Amano, Yukiko Nagatoshi, Masanao Kawana
  • Patent number: 9453991
    Abstract: A wide-angle lens having a field angle larger than 180 degrees includes, in order from an object side to an image side, a front group, a reflection surface, and a back group, wherein the front group includes three lenses having a negative refractive power, the reflection surface is configured to curve an optical axis of the front group at 90 degrees toward the back group, the back group includes four lenses having a positive refractive power, a front principle point is set between a second lens and a third lens from the object side in the front group, and a focal length of an entire system f and a distance between an intersection of the reflection surface and the optical axis of the front group and the front principle point d satisfy the following condition (1). 7.0<d/f<9.
    Type: Grant
    Filed: March 18, 2015
    Date of Patent: September 27, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hiroyuki Satoh, Noriyuki Terao, Yoshiaki Irino, Tomonori Tanaka, Nozomi Imae, Toru Harada, Hirokazu Takenaka, Hideaki Yamamoto, Kensuke Masuda, Satoshi Sawaguchi, Daisuke Bessho
  • Patent number: 9442278
    Abstract: A zoom lens consists of a negative first lens group, a stop, a positive second lens group, a negative third lens group, a positive fourth lens group, and a positive fifth lens group in this order from the object side. The first lens group through the fourth lens group move along the optical axis while changing magnification such that the distance between the first lens group and the second lens group is reduced and the distance between the second lens group and the third lens group is increased. The fifth lens group is fixed with respect to an image surface while changing magnification. The first lens group consists of a first lens, a second lens, a third lens, and a fourth lens in this order from the object side.
    Type: Grant
    Filed: November 12, 2014
    Date of Patent: September 13, 2016
    Assignee: FUJIFILM Corporation
    Inventor: Taiga Noda
  • Patent number: 9442277
    Abstract: A wide-angle lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first, second lens are convex-concave lenses with negative refractive power and include a convex surface facing the object side and a concave surface facing the image side respectively. The third lens is with positive refractive power and includes a convex surface facing the image side. The fourth, seventh lens are biconvex lenses. The fifth, sixth lens are with refractive power. The fifth lens and the sixth lens satisfy: ?10<f56/f<?2 wherein f56 is an effective focal length of a combination of the fifth lens and the sixth lens, and f is an effective focal length of the wide-angle lens.
    Type: Grant
    Filed: May 2, 2016
    Date of Patent: September 13, 2016
    Assignees: AO Ether Optronics (Shenzhen) Limited, AO Ether Corporation
    Inventor: Po-Yuan Shih
  • Patent number: 9423596
    Abstract: A retrofocus-type wide-angle lens consists of a negative first lens-group, a positive second lens-group, and a positive third lens-group in this order from an object-side. The first lens-group consists of a positive meniscus-lens with its convex surface facing the object-side and three negative meniscus-lenses with their convex surfaces facing the object-side in this order from the object-side. The second lens-group includes two cemented lenses, and a lens closest to an image-side in the second lens-group is one of the at least two cemented lenses. The third lens-group consists of a 3a-th lens-group, which consists of a positive meniscus-lens with its convex surface facing the object-side and a negative meniscus-lens with its convex surface facing the object-side, and a 3b-th lens-group, which includes at least two cemented lenses and has positive refractive power as a whole, in this order from the object-side.
    Type: Grant
    Filed: June 10, 2015
    Date of Patent: August 23, 2016
    Assignee: FUJIFILM Corporation
    Inventor: Yasutaka Shimada
  • Patent number: 9377607
    Abstract: A zoom lens substantially consists of a negative first lens group, a positive second lens group, a negative third lens group, a positive fourth lens group, and a positive fifth lens group in this order from the object side; wherein the first lens group through the fourth lens group move along the optical axis while changing magnification from the wide angle end to the telephoto end so as to change the distances among one another such that the distance between the first lens group and the second lens group is reduced and the distance between the second lens group and the third lens group is increased; the fifth lens group is fixed with respect to an image surface while changing magnification; and conditional formulas (1) and (2) below are satisfied: 0.15<|f1|/f2<1.00??(1) 0.1<f4/f5<1.1??(2).
    Type: Grant
    Filed: November 13, 2014
    Date of Patent: June 28, 2016
    Assignee: FUJIFILM Corporation
    Inventor: Taiga Noda
  • Patent number: 9350919
    Abstract: Provided is an image pickup apparatus including a zoos lens and a solid-state image pickup element. The zoom lens includes a first lens unit having a negative refractive power, an aperture stop, and a second lens unit having a positive refractive power. The first lens unit consists of a first lens sub-unit having a negative refractive power, which consists of two negative lenses, and a second lens sub-unit having a positive refractive power. The first lens unit and the second lens unit are configured to move in different loci for zooming. Each of a full-open f-number (Fnow) of the zoom lens, a focal length of the zoom lens, a focal length of the first lens sub-unit, and a pixel pitch (P) of the solid-state image pickup element is appropriately set.
    Type: Grant
    Filed: April 28, 2015
    Date of Patent: May 24, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Shinji Yamasaki
  • Patent number: 9332181
    Abstract: An f-theta lens system for a camera that provides a wide field-of-view, relatively low distortion, and a compact footprint. The lens system comprises four molded plastic elements with seven aspheric surfaces. Within a total thickness of 2.5 millimeters, the system is able to provide an image that is 1.2 millimeters across with a horizontal field of view of 127 degrees. The images produced by the system are well-suited for use with conventional face tracking algorithms designed to process rectilinear images produced by cameras with a narrower field of view.
    Type: Grant
    Filed: November 5, 2014
    Date of Patent: May 3, 2016
    Assignee: Amazon Technologies, Inc.
    Inventors: Eric Gifford Marason, Miguel Virgen
  • Patent number: 9316818
    Abstract: In a zoom lens in which a first lens group having a negative refractive power and a second lens group having a positive refractive power are disposed in order from the object side and zooming is performed by moving the first and the second lens groups, the first lens group is formed of a first lens having a negative refractive power, a second lens, a third lens having a negative refractive power, and a fourth lens having a positive refractive power. Then, when the focal length of the second lens, the focal length of the entire system at the wide angle end, the focal length of the first lens group, and the focal length of the second lens group are taken as fG12, fw, f1, and f2 respectively, the zoom lens is configured to satisfy conditional expressions give below: 0.00<fw/f2<0.50??(1-1); and ?0.19<f1/fG12<0.16??(2-1).
    Type: Grant
    Filed: February 5, 2014
    Date of Patent: April 19, 2016
    Assignee: FUJIFILM Corporation
    Inventors: Hiroki Saito, Michio Cho, Toru Ito
  • Patent number: 9291805
    Abstract: A zoom lens includes a first lens group having negative refractive power, a second lens group having positive refractive power and a third lens group having positive refractive power. The second lens group is disposed between the first lens group and the third lens group. The second lens group includes at least an aspheric glass lens. Through using the aspheric glass lens, the imaging quality of the disclosed zoom lens is not sensitive to temperatures changes.
    Type: Grant
    Filed: November 24, 2014
    Date of Patent: March 22, 2016
    Assignee: A-OPTRONICS TECHNOLOGY INC.
    Inventor: Chao-Hung Lin
  • Patent number: 9261685
    Abstract: A zoom lens substantially consists of a first lens group having a negative refractive power and a second lens group having a positive refractive power arranged in order from the object side; that changes magnification by moving the first lens group and the second lens group; and wherein the first lens group is configured by a first lens having a negative refractive power, a second lens, a third lens having a negative refractive power, and a fourth lens having a positive refractive power, arranged in order from the object side. The zoom lens satisfies a predetermined conditional expression.
    Type: Grant
    Filed: February 10, 2014
    Date of Patent: February 16, 2016
    Assignee: FUJIFILM Corporation
    Inventors: Hiroki Saito, Michio Cho, Toru Ito
  • Patent number: 9256059
    Abstract: A zoom lens system having a negative first lens group and a positive second lens group, from an object side, and achieving zooming by varying a group-to-group distance. The second lens group includes a three-element cemented lens which is a set of three lens elements cemented together including, from the object side, a negative first lens, a positive second lens, and a negative third lens, and the three-element cemented lens fulfills conditional formulas 0.08<(rs2+rs1)/(rs2?rs1)<0.5, 27<v2-v1<40, 20<v2-v3<38 (rs1, rs2 represent the curvature radius of the sides of cemented surfaces of the three-element cemented lens on the object side and the image side respectively, and v1-3 represent the Abbe numbers of the first to third lenses of the three-element cemented lens).
    Type: Grant
    Filed: July 4, 2013
    Date of Patent: February 9, 2016
    Assignees: KONICA MINOLTA, INC., NIKON CORPORATION
    Inventors: Kana Inoue, Mamoru Terada, Haruo Sato