Nikon Corporation

Komatsu Corporation

Fujitsu Corporation

Ajinomoto Co., Ltd.

Canon Kabushiki Kaisha

The University of Tokyo

Fujitsu Vlsi Limited

Fuji Electric Co., Ltd.

Nippon Kogaku K.k.

Nok Corporation

Tamron Company, Ltd.

Howa Textile Industry Co., Ltd.

Nkon Corporation

Hiroshi Yamamoto

Tomoki Ito

Ryota Yoshimoto

Kohei Yoshimoto

Takeshi Suzuki

Satoshi Miwa

Morikazu Kito

Tatsunori Kawashima

Tsuyoshi Kobayashi

Yukio Furukawa

Jun Maruyama

Motoi Ueda

Ryuusuke Komura

Mitsuyo Nagano

Teiji Yamamoto

Nobutsugu Fujino

Masashi Yamashita

Koji Nakamichi

Satoru Shibata

Akira Hashimoto

Takeru Uehara

Ayumu Makida

Hiroshi Yabumoto

Keisuke Tsubonoya

Satoshi Imai

Haruo Sato

Toshinobu Tokita

Akihiko Obama

Toshio Soumiya

Hirotaka Oshima

Naoyuki Fukuchi

Kazumasa Ushiki

Hidenori Nomura

Kenji Nagai

Taku Matsuo

Toshiaki Funakubo

Tadanobu Tsunoda

Atsunobu Masuno

Masami Nakashima

Kensuke Uchida

Isaya Sobue

Hiroyuki Inoue

Satoshi Yamaguchi

Atsushi Shibayama

Kazuo Sasaki

Koichi Ishii

Kazuhiro Hatake

Issei Tanaka

Hiroshi Nishihara

Shigeki Fukuta

Toru Matsuyama

Dayong Li

Seiji Niwa

Hiroki Harada

Shinji Kaneko

Hidehiko Hizuka

Shunsuke Kikuchi

Norikazu Yokoi

Shingo Makino

Keiko Mizuguchi

Tatsuo Aira

Kazuo Kuroki

Takashi Kayahara

Motohide Sugihara

Satoshi Iwayama

Tomoko Takeda

Shinichi Fujita

Taishi Oiwa

Kiyonori Ogura

Takashi Horii

Masataka Shoji

Hajime Koganei

Yasuhiro Okuma

Akiko Tanaka

Hiroyuki Tokunaga

Atsushi Nagato

Kenji Maeda

Shunsuke Kageyama

Takeshi Nishinomiya

Shinji Hiramatsu

Jiro Kataoka

Yohko Kawai

Kiyoaki Watanabe

Hideyuki Hiraiwa

Toshiyuki Kamei

Akihiro Horiuchi

Hideaki Kihara

Harumi Arisaka

Akinobu Iwasaki

Yasunori Sato

Tetsuya Koide

Shunichi Shibata

Hirofumi Mitome

Natsuo Masuda

Shuichi Mizata

Tsuyoshi Takehiro

Manabu Matsumoto

Haruhiko Horizoe

Toshihiko Motoseko

An optical glass includes, in terms of mol % of cations, a total amount of La, Y, and Gdcomponents falling within a range of from 5% to 65% and a total amount of Zr, Hf, and Tacomponents falling within a range of from 5% to 65%, and a relationship expressed in Expression (1) given below is satisfied. (La+Y+Gd)×(Zr+Hf+Ta)≥400(%).

Optical glass, optical element composed of optical glass, optical system interchangeable lens, and optical device

A variable-power optical system (ZL) comprises a first lens group (G) having a negative refractive power and a succeeding lens group (GR), which are disposed on an optical axis in that order from the object side. When varying magnification from wide angle to telephoto, the space between the adjacent lens groups changes. The succeeding lens group (GR) comprises: a first focusing lens group (G) having a positive refractive power; and a second focusing lens group (G) having a positive refractive power. When focusing from infinity to a proximate distance, the first focusing lens group (G) moves toward the object side, and the second focusing lens group (G) moves toward the image side.

Zoom optical system, optical apparatus and method for manufacturing the zoom optical system

Provided is optical glass containing, in terms of mol % of cations: 10 to 60% of a Lacomponent; more than 0% and up to 75% of a Gacomponent; and 5 to 75% of a Nbcomponent, in which a total amount of the Lacomponent, Gacomponent, and Nbcomponent is 60 to 100%.

Optical glass, optical element including optical glass, and optical apparatus

A zoom optical system includes, in order from an object, a first lens group, a second lens group, and a third lens group having positive, negative, and positive refractive powers, respectively. The first lens group moves toward the object and air distances between the first to third lens groups vary upon zooming from a wide-angle end state to a tele-photo end state. The first lens group comprises a cemented lens consisting of a negative lens and a positive lens in order from the object. The following conditional expressions are satisfied:4.40<1/(−2)<8.000.60<3/<3.500.60<(−2)/3<1.0530.00°<ω<80.000f1, f2, and f3 denoting focal lengths of the first to third lens groups, respectively, and fw and ow denoting a focal length of the zoom optical system and a half angle of view in the wide-angle end state, respectively.

Zoom optical system, imaging device and method for manufacturing the zoom optical system

An optical system (LS) includes lenses (L,L) satisfying the following conditional expressions,νLZ<35.0, and0.702<θFLZ+(0.00316×νLZ),

Optical system, optical apparatus, and method of manufacturing optical system

An optical system (LS) includes lenses (L,L) satisfying the following conditional expressions,+(0.01425×)<2.12, andν35.0,where ndLZ: a refractive index of the lens with reference to d-line, and

An optical system (LS) Includes lenses (L22,L23) satisfying the following conditional expressions,&#x3c;35.0, and0.702&#x3c;&#x3b8;+(0.00316&#xd7;&#x3bd;),where &#x3bd;dLZ: Abbe number of the lens with reference to d-line, and

A zoom optical system includes, disposed in order from an object, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power. At least a part of the third lens group is arranged to be movable along an optical axis as a focusing lens group, and the focusing lens group is moved toward an image when a focusing state on a long-distance object is changed to a focusing state on a short-distance object. The following conditional expression is satisfied: 0.90&#x3c;f3/fw&#x3c;1.50, where f3 denotes a focal length of the third lens group and fw denotes a focal length of the zoom optical system in a wide-angle end state.

Provided is a variable magnification optical system comprising, in order from an object side along an optical axis, a first lens group Ghaving positive refractive power, a second lens group Ghaving negative refractive power, a third lens group Ghaving positive refractive power, and a fourth lens group G; upon zooming from a wide angle end state to a telephoto end state, a distance between the first lens group Gand the second lens group Gbeing varied, a distance between the second lens group Gand the third lens group Gbeing varied, and a distance between the third lens group and the fourth lens group being varied; the third lens group Gcomprising, in order from the object side along the optical axis, a 3a-th lens group Ghaving positive refractive power, an aperture S, and a 3b-th lens group Ghaving positive refractive power; a lens group having negative refractive power within the 3b-th lens group Gbeing used as a vibration reduction lens group and moved so as to include a component in a direction orthogonal to the optical axis, whereby image plane correction is performed when image blurring occurs; and predetermined conditions being satisfied. Whereby, a small-size and high-performance variable magnification optical system, capable of realizing a small variation in aberration and attaining a sufficient brightness even in the telephoto state, an imaging apparatus, and a method for manufacturing the variable magnification optical system are provided.

Variable magnification optical system, imaging apparatus, and method for manufacturing variable magnification optical system

An optical glass includes, in terms of mol % of cations, a total amount of La, Y, and Gdcomponents falling within a range of from 5% to 65% and a total amount of Zr, Hf, and Tacomponents failing within a range of from 5% to 65%, and a relationship expressed in Expression (1) given below is satisfied. (La+Y+Gd)&#xd7;(ZrHf+Ta)&#x2265;400(%).

A variable magnification optical system includes: a positive first lens group; a negative lens group closer to an image than the first lens group; a positive lens group closer to the image than the negative lens group and including at least one lens closer to the image than an aperture stop; and a focusing group between the negative lens group and the positive lens group. When varying magnification, the first lens group moves with respect to an image plane, and distances between the first lens group and the negative lens group and between the negative lens group and the positive lens group are changed. When focusing, a distance between the focusing group and a lens facing an object-side of the focusing group is changed, and a distance between the focusing group and a lens facing an image-side of the focusing group is changed. Predetermined conditional expressions are satisfied.

Variable magnification optical system, optical apparatus, and variable magnification optical system manufacturing method

A zoom optical system includes, disposed in order from an object, a first lens group (G) having positive refractive power, a second lens group (G) having negative refractive power, and a third lens group (G) having positive refractive power, wherein at least a part of the second lens group (G) or at least a part of the third lens group (G) is configured to be movable, as a vibration-proofing lens group for correcting an image blur, so as to have a movement component in a direction perpendicular to an optical axis, and the following conditional expression is satisfied:4.40&#x3c;1/(&#x2212;2)&#x3c;8.00where f1 denotes a focal length of the first lens group (G), and f2 denotes a focal length of the second lens group (G).

Providing a zoom lens system having excellent optical performance with a high zoom ratio, an imaging apparatus, and a method for zooming the zoom lens system. The system including, in order from an object, a first group Ghaving negative refractive power, a second group Ghaving positive refractive power, a third group Ghaving negative refractive power, and a fourth group Ghaving positive refractive power. An aperture stop S is disposed between the second group Gand the fourth group G. Upon zooming from a wide-angle end state to a telephoto end state, each group is moved such that a distance between the second group Gand the third group Gincreases, a distance between the third group Gand the fourth group Gdecreases, and the aperture stop S is moved together with the third group G. Given conditions are satisfied.

Zoom lens system, imaging apparatus, and method for zooming the zoom lens system

Growing community of inventors

Kawasaki, Japan

Hiroshi Yamamoto