Olympus Corporation

Olympus Imaging Corporation

Toyoki Kon

Yasuharu Yamada

Kazuteru Kawamura

Tetsuya Yanai

Minoru Ueda

Toshio Takahashi

Keisuke Ichikawa

Masaru Morooka

Yasuji Ogata

Masahiro Imamura

Yuki Kubota

Daichi Murakami

Shinichi Mihara

Hisashi Goto

Mayu Miki

Yasutaka Kashiki

Koji Nakagawa

Masaki Arakawa

A zoom optical system includes a front-side lens unit, an intermediate lens unit, and a rear-side lens unit. The front-side lens unit includes a first front unit and a second front unit, and a distance between the first front unit and the second front unit is wider at a telephoto end than at a wide angle end. The intermediate lens unit includes a first intermediate unit and a second intermediate unit, and a distance between the first intermediate unit and the second intermediate unit is narrower at the telephoto end than at the wide angle end. A distance between the second intermediate unit and a lens unit adjacent to the second intermediate unit varies. The second intermediate unit moves at the time of focusing, and the following conditional expressions (1) and (2) are satisfied:0.9&#x2264;&#x2264;1.17&#x2003;&#x2003;(1)4.2&#x2264;&#x2264;20.0&#x2003;&#x2003;(2).

Zoom optical system, image pickup optical system, and image pickup apparatus using the same

A zoom lens 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, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power. The first lens unit includes a positive lens, and the second lens unit includes a positive lens, and the following conditional expressions (1), (2), (3), and (4) are satisfied:&#x2212;0.015&#x2264;&#x2264;0.015&#x2003;&#x2003;(1),70.3&#x2264;&#x3bd;&#x2003;&#x2003;(2),1.76&#x2264;&#x2264;2.3&#x2003;&#x2003;(3), and0.3&#x2264;||&#x2264;0.9&#x2003;&#x2003;(4).

Zoom lens and image pickup apparatus using the same

A zoom lens includes a front-side lens unit, a rear-side lens unit, and an aperture stop. The front-side lens unit includes either one lens unit having a negative refractive power or two lens units having a negative refractive power, and has a negative refractive power as a whole. The rear-side lens unit is disposed on an image side of the front-side lens unit, and has a positive refractive power as a whole at a telephoto end. The rear-side lens unit includes a plurality of lens units, and includes an object-side positive lens unit having a positive refractive power which is disposed nearest to object and the following conditional expressions (1), (2), and (3) are satisfied:1.2&#x2264;||&#x2264;6&#x2003;&#x2003;(1),10&#x2264;&#x3bd;&#x2264;27&#x2003;&#x2003;(2), and&#x2212;0.03&#x2264;&#x2264;0.014&#x2003;&#x2003;(3).

A zoom lens includes, in order from the object side, a first lens unit having a positive focal length, a second lens unit having a negative focal length, a third lens unit having a positive focal length, a fourth lens unit having a negative focal length, and a fifth lens unit having a positive focal length, wherein following Conditional Expressions (1) and (2) are satisfied:0.3&#x2264;3445&#x2264;1&#x2003;&#x2003;(1), and0.2&#x2264;(3445)/(3445)&#x2264;0.6&#x2003;&#x2003;(2).

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 comprises in order from an object side a first lens unit having a positive refractive power. The first lens unit consist one positive lens. The zoom lens satisfies the following conditional expressions (1) and (2).Fno&#x3c;2.7&#x2003;&#x2003;(1)3.1&#x3c;where,

The invention provides a zoom lens, characterized by comprising, a zoom lens, which comprises, in order from an object side thereof: a first lens group of negative refracting power, a second lens group of positive refracting power, a third lens group of negative refracting power, and a fourth lens group of positive refracting power, wherein: upon zooming from a wide-angle end to a telephoto end of the zoom lens, a separation between the respective lens groups changes, upon focusing from a focusing-on-infinity state to a close-range focusing state, the third lens group moves in an optical axis direction, and the conditions (1) and (2) are satisfied at the wide-angle end.

Zoom lens, and imaging apparatus incorporating the same

The zoom lens of the invention comprises, in order from an object side thereof, a first lens group having positive refracting power, a second lens group having negative refracting power, a third lens group having positive refracting power, a fourth lens group having positive refracting power, a fifth lens group having negative refracting power, and a sixth lens group having positive refracting power. The first lens group includes a reflective optical element, and the lens component in, and on the most image side of, the fourth lens group has negative refracting power.

Zoom lens and electronic imaging apparatus incorporating the same

The invention provides a zoom lens, characterized by comprising, in order from an object side thereof,

The zoom lens of the invention comprises, in order from an object side thereof, a first lens group having positive refracting power, a second lens group having negative refracting power, a third lens group having positive refracting power, a fourth lens group having positive refracting power, a fifth lens group having negative refracting power, and a sixth lens group having positive refracting power. The first lens group includes a reflective optical element, and the lens in and on the most image side of the fourth lens group comprises a negative lens concave on its image side.

An image pickup apparatus includes in order from an object side 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, and a fourth lens group having a negative refractive power. The fourth lens group includes an image forming optical system which comprises two lens components namely, a positive meniscus lens having a convex surface directed toward an image side, and a biconcave negative lens in order from the object side, or, one lens component in which, the positive meniscus lens having the convex surface directed toward the image side, and the biconcave negative lens are cemented, and the fourth lens group satisfies a predetermined conditional expression.

Image pickup apparatus

An image forming optical system 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, which includes an aperture stop, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power. The first lens group, in order from the object side, includes a negative sub-group and a positive sub-group. The third lens group is a focusing group which includes only a cemented lens having a convex surface directed toward the object side, of a negative lens and a positive meniscus lens, in order from the object side.

Image forming optical system and image pick up apparatus using the same

A lens component of the present invention is made by cementing a lens LA and a lens LB having a refracting power smaller than a refracting power of the lens LA, and satisfies predetermined conditional expressions. Moreover, in an image forming optical system of the present invention which includes a lens group B having a negative refracting power, a lens group C having a positive refracting power and which moves only toward an object side at the time of zooming from a wide angle end to a telephoto end, and one or two more lens groups additionally, one of the lens components of the present invention is used in the lens group B.

Growing community of inventors

Hachioji, Japan

Toyoki Kon