Olympus Corporation

Olympus Imaging Corporation

Nec Corporation

Olympus Optical Company, Ltd.

Masahiro Imamura

Toshihide Nozawa

Minoru Ueda

Shinichi Mihara

Hisashi Goto

Yuji Miyauchi

Toyoharu Hanzawa

Tsutomu Uzawa

Yuko Kobayashi

Kouki Hozumi

Mayu Miki

Takuji Horie

Masahito Watanabe

Takahiro Amanai

Tomoyuki Satori

Akinori Nishio

Takayuki Mimura

Masaru Morooka

Yuji Kamo

Tetsuya Yanai

Toyoki Kon

Koji Nakagawa

Kazuya Nishimura

Kazuteru Kawamura

Kenji Ono

Takashi Kasahara

Toru Miyajima

Masanobu Arai

Hiroyasu Ozaki

A variable magnification optical system includes: in order from an 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; and an image-side lens unit. The image-side lens unit includes a lens belonging to a first region and a lens belonging to a second region. At a time of changing magnification, the second lens unit and the third lens unit move.

Variable magnification optical system and image pickup apparatus using the same

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

A zoom lens includes in order from an object side to an image 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, and a fourth lens unit having a negative refractive power, and includes an aperture stop which is disposed between the second lens unit and the fourth lens unit, and the first lens unit includes a negative lens and a plurality of positive lenses, and 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, and a distance between the third lens unit and the fourth lens unit changes, and the zoom lens satisfies predetermined conditional expressions.

Zoom lens and image pickup apparatus using the same

A wide angle lens includes in order from an object side, a front lens unit having a positive refractive power, one focusing lens having a negative refractive power, and a rear lens unit having a positive refractive power, and at the time of focusing, the focusing lens moves on an optical axis, and the following conditional expressions (1) and (2) are satisfied.0.1&#x3c;&#x3c;0.5&#x2003;&#x2003;(1)3.0&#x2266;&#x2003;&#x2003;(2)

Wide angle lens and image pickup apparatus using the same

A zoom lens comprises a first lens unit Ghaving a positive refractive power, a second lens unit Ghaving a negative refractive power, and a plurality of lens units Gand GZooming from a wide angle end to a telephoto end is carried out by changing a distance between the lens units. One of the first lens unit Gand the second lens unit Ghas, or both the first lens unit Gand the second lens unit Ghave a specific arrangement.

A zoom lens comprising, 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. Each distance between the first lens unit and the second lens unit, between the third lens unit and the fourth lens unit, and between the fourth lens unit and the fourth lens unit at the telephoto end is longer than at the wide angle end, and a distance between the second lens unit and the third lens unit at the telephoto end is shorter than at the wide angle end, and the following conditional expressions are satisfied.2&#x3c;&#x3c;61.2&#x3c;&#x3c;40.02&#x3c;&#x3c;0.12

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.

During zooming from the wide angle end to the telephoto end, the distance between the first lens unit having a positive refractive power and the second lens unit having a negative refractive power, the distance between the second lens unit and the third lens unit having a positive refractive power, and the distance between the third lens unit and the fourth lens unit having a negative refractive power vary. In zooming from the wide angle end to the telephoto end, the first lens unit is located closer to the object side at the telephoto end than at the wide angle end. The first lens unit consists of two lenses including a negative lens and a positive lens. The first lens unit has at least one aspheric surface in the optical path. The zoom lens satisfies the following conditional expression (1):0.5&#x3c;(/&#x3b2;)/&#x3c;1.0&#x2003;&#x2003;(1).

A zoom lens comprises a first lens unit Ghaving a positive refractive power, a second lens unit Ghaving a negative refractive power, and a plurality of lens units Gand G. Zooming from a wide angle end to a telephoto end is carried out by changing a distance between the lens units. One of the first lens unit Gand the second lens unit Ghas, or both the first lens unit Gand the second lens unit Ghave a specific arrangement.

A zoom lens comprises, in order from its object side, a first lens unit having a negative refractive power and a second lens unit having a positive refractive power. The first lens unit comprises a first lens having a negative refractive power and a second lens having a positive refractive power. The zoom lens satisfies the following conditional expressions (1), (2), and (3):&#x2266;1.70&#x2003;&#x2003;(1),&#x2266;1.70&#x2003;&#x2003;(2), and|&#x3bd;&#x2212;&#x3bd;&#x2267;31&#x2003;&#x2003;(3),where nis the refractive index of the first lens having a negative refractive power in the first lens unit for the d-line, &#x3bd;is the Abbe constant of the first lens having a negative refractive power in the first lens unit, nis the refractive index of the second lens having a positive refractive power in the first lens unit for the d-line, and &#x3bd;is the Abbe constant of the second lens having a positive refractive power in the first lens unit.

A zoom lens system having, in order from an 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; and a fourth lens unit having a positive refractive power, wherein during magnification change from a wide-angle end to a telephoto end, an interval between the first lens unit and the second lens unit, an interval between the second lens unit and the third lens unit and an interval between the third lens unit and the fourth lens unit change.

Zoom lens system and image pickup apparatus using the same

A zoom lens system includes, in order from an 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, and a fourth lens unit having a positive refractive power; and in a telephoto end as compared with a wide-angle end, a space between the first lens unit and the second lens unit increases, a space between the second lens unit and the third lens unit decreases, and a space between the third lens unit and the fourth lens unit changes.

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Hachioji, Japan

Masahiro Imamura