Olympus Corporation

Olympus Imaging Corporation

Mayu Miki

Tetsuya Yanai

Minoru Ueda

Masahito Watanabe

Masahiro Imamura

Akinori Nishio

Tomoyuki Satori

Toshihide Nozawa

Toyoki Kon

Masaya Ota

Koji Nakagawa

Takeshi Hosoya

Tsubasa Niiyama

Akiko Naito

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 comprises in order from an object side,

Zoom lens and image pickup apparatus using the same

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

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).

A zoom lens comprises in order from an object side, a first lens unit having a positive refractive power, and at the time of zooming from a wide angle end to a telephoto end, the first lens unit moves, and the zoom lens satisfies the following conditional expression (1).()&#x3c;1.64&#x2003;&#x2003;(1)

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,

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 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 at the time of zooming, the first lens unit moves, and the zoom lens satisfies the following conditional expressions (1-1a), (1-2a), and (1-3a).0.43&#x3c;(&#x3b2;/&#x3b2;)/(&#x3b2;/&#x3b2;)&#x3c;0.68&#x2003;&#x2003;(1-1a)0.4&#x3c;(&#x394;)/(&#x394;)&#x3c;2.3&#x2003;&#x2003;(1-2a)2.1&#x3c;&#x3c;4.1&#x2003;&#x2003;(1-3a)

A zoom lens comprises in order from an object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a negative refractive power. The second lens unit comprises in order from the object side, a positive lens, a negative lens, and a positive lens. At the time of zooming from a wide angle end to a telephoto end, the first lens unit moves toward the object side, and the fourth lens unit moves, and a distance between the first lens unit and the second lens unit decreases monotonically, a distance between the second lens unit and the third lens unit increases monotonically, and a distance between the third lens unit and the fourth lens unit increases monotonically.

A zoom lens comprises in order from an object side, a first lens unit, a second lens unit, a third lens unit, a fourth lens unit, and a fifth lens unit having, respectively, a positive, negative, positive, negative, and positive refractive power. At the time of zooming from a wide angle end to a telephoto end, the first, third, and fourth lens units move toward the object side. A distance between the first and second lens units increase, a distance between the second and third lens units decrease, a distance between the third lens unit and the fourth lens unit changes, and a distance between the fourth lens unit and the fifth lens unit increases. The zoom lens satisfies the following expressions:1.54&#x3c;&#x3b2;/&#x3b2;&#x3c;3.0&#x2003;&#x2003;(1a)1.0&#x3c;&#x3b2;/&#x3b2;&#x3c;5.0&#x2003;&#x2003;(2)1.0&#x3c;&#x3b2;/&#x3b2;&#x3c;3.0&#x2003;&#x2003;(3).

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Tokyo, Japan

Mayu Miki