Olympus Corporation

Sharp Kabushiki Kaisha Corporation

Olympus Imaging Corporation

Quarrymen&co. Inc.

Minoru Ueda

Mayu Miki

Tetsuya Yanai

Masahiro Imamura

Masahito Watanabe

Toyoki Kon

Masaru Morooka

Tomoyuki Satori

Kuniaki Okada

Akinori Nishio

Koji Nakagawa

Takeshi Hosoya

Ryo Abe

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 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.

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 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, 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).

When focal lengths are discretely set, zoom positions are set, relative to a focal length fr at a position at which a movement direction of a correction group, is reversed, such that a difference value between a focal length which is the closest to the focal length fr and falling between a focal length fw at a wide angle end and the focal length fr, and a next focal length is larger than a difference value between any remaining adjacent focal lengths. By moving from the zoom position of the closest focal length directly to the zoom position of the next focal length, a movement range of the correction group can be made smaller than a movement range in the case where the lens position of the focal length fr is set as the zoom position.

Driving method for zoom lens device, image pickup device using the method, and mobile information device

A zoom lens in the present invention is composed of a first lens group Ghaving a fixed distance from the image plane side and negative refracting power, a second lens group Ghaving positive refracting power and moving during zooming, a third lens group Ghaving positive refracting power and moving during zooming, and a fourth lens group Ghaving a fixed distance from the image plane side and positive refracting power. The first, the second, the third and the fourth lens groups G-Gare arranged in order from the object side to the image plane side. The third lens group Gincludes an aperture stop s, a lenshaving positive refracting power and a lenshaving negative refracting power, being arranged in order from the object side to the image plane side. The zoom lens is high performance and large in zoom ratio and is compact due to the simple structure.

Zoom lens, digital camera and portable information device

First, second, third and fourth lens groups of a zoom lens portion are arranged on an optical axis in order from an object to be imaged side toward an electronic imaging device. The first lens group has a negative refracting power and a fixed position on the optical axis. The second lens group has a positive refracting power and is moved along the optical axis to effect focusing. The third lens group has a positive refracting power and is moved along the optical axis during a magnification change. The fourth lens group has a fixed position on the optical axis. An angle of incidence of a ray of a maximum image height when the zoom lens portion is in a state at a telephoto end is not greater than the angle of incidence of the ray of the maximum image height incident on the electronic imaging device when the zoom lens portion is in a state at a wide angle end. The angle of incidence of the ray of the maximum image height incident on the electronic imaging device when the zoom lens portion is in the state at the telephoto end is not smaller than 5&#xb0;.

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Kanagawa, Japan

Minoru Ueda