Canon Kabushiki Kaisha

Norihiro Nanba

Makoto Sekita

Takeshi Akiyama

Tsunefumi Tanaka

Keisuke Araki

Hiroshi Saruwatari

Kenichi Kimura

Hiroyuki Hamano

Koji Hoshi

Nobuhiro Takeda

Toshikazu Yanai

Shigeo Ogura

Yoshihiro Uchino

Toshiya Kurihashi

Hideki Morishima

Masao Suzuki

Sadahiko Tsuji

Naosato Taniguchi

Yoko Yoshinaga

Shin Kobayashi

Kazuyuki Matoba

Daisuke Ito

Susumu Matsumura

Toshiyuki Sudo

Tadashi Kaneko

Rei Iwama

Michiharu Aratani

Toshitaka Higuchi

Provided is a zoom lens, including, in order from an object side to an image side: a positive first lens unit; a negative second lens unit; a positive third lens unit; a fourth lens unit having one of positive and negative refractive powers; and an aperture stop arranged one of between the second lens unit and the third lens unit, within the third lens unit, and between the third lens unit and the fourth lens unit. In the zoom lens, a shift image stabilizing unit configured to be moved in a direction perpendicular to an optical axis to perform image blur correction and a tilt image stabilizing unit configured to be rotated with one of a point on the optical axis and a point near the optical axis as a rotation center to perform image blur correction are arranged in appropriate positions, respectively.

Zoom lens and image pickup apparatus including the same

A zoom lens includes, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, and a rear lens group having a plurality of lens units at least one of which has positive refractive power. The distance between the first lens unit and the second lens unit is greater at a telephoto end than at a wide angle end. The first lens unit includes a positive lens and a negative lens. The rear lens group includes a lens unit R comprising a positive lens and a negative lens. The lens unit R has the highest zoom ratio among the lens units included in the rear lens group. The materials of the positive and negative lenses included in the first lens unit and in the lens unit R are selected appropriately based on predetermined mathematical conditions.

Zoom lens and image pickup apparatus having the same

A zoom lens includes, in order from its 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. At a time of zooming from the wide angle end to the telephoto end, the lens units move in such a way that the distance between the first lens unit and the second lens unit decreases and the distance between the second lens unit and the third lens unit increases. The zoom lens satisfies the conditions '0.35&#x3c;|f1|/ft&#x3c;0.55' and '1.80&#x3c;Npa', where ft is the focal length of the entire system at the telephoto end, f1 is the focal length of the first lens unit, and Npa is the average of the refractive indices of the materials of all the positive lenses in the entire system.

Zoom lens and image pickup apparatus equipped with same

A zoom lens includes first to fifth lens units arranged sequentially from object to image sides and having respective refractive powers. Compared to a wide-angle end, at a telephoto end, the distance between the first and second lens units, the distance between the third and fourth lens units, and the distance between the fourth and fifth lens units are increased, and the distance between the second and third lens units is decreased. Compared to the wide-angle end, at the telephoto end, the first lens unit is positioned closer to the object side. The first and second lens units each consist of a positive lens element and a negative lens element. The distances between the third and fourth lens units at the wide-angle and telephoto ends Dand Dand the focal length of the entire zoom lens at the wide-angle end fw are appropriately set.

Zoom lens and image pickup apparatus using the same

A zoom lens includes, in order from an object side to an image side, first to fifth lens units respectively having positive, negative, positive, negative, and positive refractive powers. During zooming from a wide-angle end to a telephoto end, each of the lens units moves in such a way that a distance between the first and second lens units increases, a distance between the second and third lens units decreases, a distance between the third and fourth lens units increases, and a distance between the fourth and fifth lens units increases. The distances Dand Dbetween the third and fourth lens units, the distances Dand Dbetween the fourth and fifth lens units, focal lengths fw and ft of the entire zoom lens, and focal lengths fand fof the first and fourth lens units are appropriately set.

A zoom lens includes, from an object side to an image side, first to fifth lens units having positive, negative, positive, negative, and positive refractive powers. A distance between the first and second lens units is longer, a distance between the second and third lens units is shorter, and a distance between the fourth and fifth lens units is longer at a telephoto end than at a wide angle end, and a distance between the third and fourth lens units differs between the telephoto end and the wide angle end. Focal lengths of the first and fourth lens units and the entire zoom lens at the wide angle end, a moving amount of the first lens unit during zooming, and a distance from a lens surface closest to the object side in the first lens unit to an image plane at the wide angle end are set properly.

Provided is a zoom lens including, in order from an object side to an image side: a positive first lens unit having two positive lenses and a negative lens; a negative second lens unit having positive and negative lenses; a positive third lens unit; and a rear group including lens unit, wherein: with respect to a wide angle end, at a telephoto end, intervals between the first and second lens units, the second and third lens units, and the third lens unit and the rear group respectively change; and a focal length and an Abbe number of a material of the positive lens of the first lens unit that has a largest Abbe number among positive lenses, a refractive index and an Abbe number of a material of the positive lens of the second lens unit, and a focal length of the first lens unit are set appropriately.

An image capturing apparatus includes a zoom lens, a solid-state image sensor which photoelectrically converts an image formed by the zoom lens, a processing unit which processes image data obtained by the solid-state image sensor, and a correction units which processes the image data from the processing unit to correct distortion aberration of the image formed by the zoom lens, and outputs the corrected image data. The lens arrangement of the zoom lens, and the length of the diagonal line of the image capturing area in correcting distortion aberration are appropriately set.

Zoom lens and image capturing apparatus having a correction unit to correct distortion aberration of the image formed by the zoom lens and to output corrected image data

A zoom lens system comprises, from an object to an image side: a first, a second, a third, a fourth, and a fifth lens units, wherein all units move during zooming so that an interval between the first and second lens units is larger, an interval between the second and third lens units is smaller, an interval between the fourth and fifth lens units is larger, at a telephoto end than those at a wide angle end, and an interval between the third and fourth lens units varies; and a focal length of the second lens unit, a focal length of an entire system at the wide angle end, a movement amount of the fourth lens unit in zooming from wide angle end to telephoto end, and intervals between the third and fourth lens units at the wide angle end and at the telephoto end are set appropriately.

Zoom lens system and image pickup apparatus including the same

Provided is a compact and high optical performance zoom lens system, including, in order of from an object side toward an image side: a first lens unit with a negative refractive power; a second lens unit with a positive refractive power; and a third lens unit with the positive refractive power, the first, second, and third lens units moving to perform zooming. The first lens unit includes a first lens element with the negative refractive power, and a second lens element with the positive refractive power in order of from the object side toward the image side, and in which a refractive index of a material of the first lens element (N), an Abbe number of a material of the second lens element (&#x3bd;), and the radii of curvatures of lens surfaces of the first lens element on the object side and the image side (R, R) are appropriately set.

A zoom lens easily performs image stabilization with a compact and light image-stabilizing lens unit, properly corrects an aberration change during image stabilization, and achieves high optical performance. The zoom lens includes a first positive lens unit, a second negative lens unit, a third positive lens unit, a fourth negative lens unit, and a fifth positive lens. These lens units are arranged in order from an object side toward an image side, and are moved during zooming. The fourth lens unit is formed by one lens component, and is moved in a direction having a component that is perpendicular to the optical axis for image shifting. The Abbe number of a negative lens that forms the fourth lens unit, the thickness of the fourth lens unit on the optical axis, and the focal length of the entire zoom lens at the wide angle end are set appropriately.

Zoom lens and image pickup apparatus including the lens

A zoom lens system includes, in order from an object side to an image side, a first lens unit having a positive optical power, a second lens unit having a negative optical power, a third lens unit having a positive optical power, and a fourth lens unit having a positive optical power. The distances between the adjacent lens units are changed during zooming. By appropriately setting the lens configurations and focal lengths of the first lens unit and the second lens unit, a compact zoom lens system is realized.

Zoom lens system and camera including the same

A zoom lens system includes a first lens unit having a negative optical power and a second lens unit having a positive optical power in order from the object side to the image side. In a zooming operation, the distance between the first lens unit and the second lens unit at the telephoto end is smaller than that at the wide angle end. The first lens unit includes a single negative lens element and a single positive lens element, and materials of the lens elements are adequately set.

A zoom lens, including, in order from an object side to an image side (a) a first lens unit of negative optical power, (b) a second lens unit of positive optical power, and (c) a third lens unit of positive optical power, wherein a separation between the first lens unit and the second lens unit and a separation between the second lens unit and the third lens unit are varied to effect variation of magnification, and wherein the zoom lens satisfies the following conditions: ndp3&#x3c;1.5 and &#x3bd;dp3&#x3e;70.0, where ndp3 and &#x3bd;dp3 are a refractive index and Abbe number, respectively, of material of the positive lens in the third lens unit.

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Utsunomiya, Japan

Norihiro Nanba