Olympus Corporation

Olympus Imaging Corporation

Nec Corporation

Olympus Optical Company, Ltd.

Other

Mitsubishi Gas Chemical Company, Inc.

Olympus Imaging Corp. and Olympus Corporation

Resonac Corporation

Masahito Watanabe

Shinichi Mihara

Hirokazu Konishi

Yuji Miyauchi

Toyoharu Hanzawa

Toru Miyajima

Minoru Eguchi

Tetsuhide Takeyama

Tomoyuki Satori

Atsujiro Ishii

Ayami Imamura

Mayu Miki

Hisashi Goto

Takahiro Amanai

Toshihide Nozawa

Kazuteru Kawamura

Masashi Hankawa

Masahiro Imamura

Eiji Shirota

Minoru Ueda

Kazuya Nishimura

Shigeru Kato

Akinori Nishio

Kouki Hozumi

Azusa Noguchi

Takeshi Hosoya

Makoto Kobayashi

Akitoshi Sugio

Tetsuya Toyoda

Hiroshi Kodama

Tetsuya Yanai

Takao Kawaki

Mitsuhiro Horikawa

Masaya Ota

Katsushige Hayashi

Takuji Ishii

Takashi Kumaki

Souroku Kawanishi

Toshiki Tamura

Tsubasa Niiyama

Miyamoto Yuki

A zoom lens includes, in order from the 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 positive refractive power. The first lens unit includes a negative lens and a positive lens. The zoom lens satisfies the following conditional expression (1):&#x3a3;d/f&#x3c;0.4&#x2003;&#x2003;(1)where &#x3a3;d3 is the total sum of the thickness of the lenses included in the first to third lens units of the zoom lens on the optical axis, and fis the focal length of the entire zoom lens system at the telephoto end.

Zoom lens and image pickup apparatus equipped with same

The invention relates to an electronic image pickup system whose depth dimension is extremely reduced, taking advantage of an optical system type that can overcome conditions imposed on the movement of a zooming movable lens group while high specifications and performance are kept. The electronic image pickup system comprises an optical path-bending zoom optical system comprising, in order from its object side, a 1-1st lens group G-comprising a negative lens group and a reflecting optical element P for bending an optical path, a 1-2nd lens group G-comprising one positive lens and a second lens group Ghaving positive refracting power. For zooming from the wide-angle end to the telephoto end, the second lens group Gmoves only toward the object side. The electronic image pickup system also comprises an electronic image pickup device I located on the image side of the zoom optical system.

Electronic image pickup system

The invention relates to an electronic image pickup system whose depth dimension is extremely reduced, taking advantage of an optical system type that can overcome conditions imposed on the movement of a zooming movable lens group while high specifications and performance are kept. The electronic image pickup system comprises an optical path-banding zoom optical system comprising, in order from its object side, a 1-1st lens group G-comprising a negative lens group and a reflecting optical element P for bending an optical path, a 1-2nd lens group G-comprising one positive lens and a second lens group Ghaving positive refracting power. For zooming from the wide-angle end to the telephoto end, the second lens group Gmoves only toward the object side. The electronic image pickup system also comprises an electronic image pickup device I located on the image side of the zoom optical system.

A lens barrel of the present invention is a lens barrel holding a photographing optical system which is a zoom lens constituted by five groups and includes: a cylindrical cam barrel arranged to be rotatable around an optical axis; a first lens driving section driving the cam barrel around the optical axis; a plurality of first cam grooves carved on an outer circumferential surface of the cam barrel; and a plurality of second cam grooves carved on an inner circumferential surface of the cam barrel. A first lens group holding barrel has a plurality of cam followers that are recessed in the first cam grooves; and each of a second lens group holding barrel and a third lens group holding barrel has a plurality of cam followers that are recessed in the second cam grooves.

Lens barrel and electronic apparatus

The invention relates to an electronic image pickup system whose depth dimension is extremely reduced, taking advantage of an optical system type that can overcome conditions imposed on the movement of a zooming movable lens group while high specifications and performance are kept. The electronic image pickup system comprises an optical path-bending zoom optical system comprising, in order from its object side, a-st lens group G-comprising a negative lens group and a reflecting optical element P for bending an optical path, a-nd lens group G-comprising one positive lens and a second lens group Ghaving positive refracting power. For zooming from the wide-angle end to the telephoto end, the second lens group Gmoves only toward the object side. The electronic image pickup system also comprises an electronic image pickup device I located on the image side of the zoom optical system.

A zoom lens includes, in order from the 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 positive refractive power. The first lens unit includes a negative lens and a positive lens. The zoom lens satisfies the following conditional expression (1):&#x3a3;&#x3c;0.4&#x2003;&#x2003;(1)where &#x3a3;d3 is the total sum of the thickness of the lenses included in the first to third lens units of the zoom lens on the optical axis, and fis the focal length of the entire zoom lens system at the telephoto end.

A zoom lens consists of, in order from the object side, 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, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power. The first lens unit and the second lens unit move during zooming from the wide angle end to the telephoto end. The zoom lens satisfies the following conditional expressions (1), (2), and (3):&#x3e;6.0&#x2003;&#x2003;(1),Fno&#x3c;3.5&#x2003;&#x2003;(2),and&#x3a3;&#x3c;0.6&#x2003;&#x2003;(3).

An image pickup apparatus includes: a zoom lens; an image pickup element having an image pickup surface which receives an image which has been formed by the zoom lens, and converts to an electric signal; a shading correction parameter storage section which stores a shading correction parameter which differs at a front-surface side and a rear-surface side with respect to a center of an image, which is for correcting asymmetric shading at the front-surface side and the rear-surface side of the zoom lens; and a shading correction section which carries out correction operation of an image which has been picked up by the image pickup element, based on the shading correction parameter of the shading correction parameter storage section. When an object having a uniform brightness is captured, at any state from the wide angle end to the telephoto end, the zoom lens satisfies conditional expression (A).

Image pickup apparatus having optical path reflecting zoom lens

An image pickup apparatus includes a zoom lens, and an image pickup element having an image pickup surface which receives optically an image formed by the zoom lens, and which converts the image received to an electric signal. The image pickup apparatus satisfies the following conditional expressions (1) Lv 1 Er/Lv 1 EL&#x3c;0.49, (2) 0.93&#x3c;Lv 1 Ef/IHs, and (3) Lv 1 Ef/Lv 1 Er&#x3c;0.99.

An image pickup apparatus, which comprises, in order from the object side, an aperture member having an opening section, a zoom lens changing a magnification by properly changing distances between a plurality of lens units, and an image pickup device, is provided with a flare stop which has an opening section with a set shape and is integrated with the most object side lens unit in the plurality of the lens units, the opening section of the aperture member does not intercept an effective light beam in the wide-angle position and intercepts a part of the effective light beam in the telephoto position, and the flare stop does not intercept in the wide-angle position the effective light beam having passed through the opening section of the aperture member and intercepts in the telephoto position a light ray which is included in the effective light beam passing through the opening section of the aperture member and strikes the edge of the opening section of the aperture member to be scattered.

Image pickup apparatus provided with zoom lens

An electronic image pickup apparatus includes a zoom lens system which is a taking optical system, an electronic image pickup element which is disposed at an image side of the taking optical system (zoom lens system), and which converts an image formed by the taking optical system (zoom lens system) to an electric signal, and an image restoring section which restores electrically a photographed image according to a difference in occurrence of an aberration by the taking optical system (zoom lens system) in an air environment photography and in a underwater environment photography.

Electronic image pickup apparatus

The invention relates to an electronic image pickup system whose depth dimension is extremely reduced, taking advantage of an optical system type that can overcome conditions imposed on the movement, of a zooming movable lens group while high specifications and performance are kept. The electronic image pickup system comprises an optical path-bending zoom optical system comprising, in order from its object side, a 1-1st lens group G-comprising a negative lens group and a reflecting optical element P for bending an optical path, a 1-2nd lens group G-comprising one positive lens and a second lens group Ghaving positive refracting power. For zooming from the wide-angle end to the telephoto end, the second lens group Gmoves only toward the object side. The electronic image pickup system also comprises an electronic image pickup device I located on the image side of the zoom optical system.

Growing community of inventors

Hachioji, Japan

Masahito Watanabe