Canon Kabushiki Kaisha

Sony Corporation

Kazuya Shimomura

Tomoyuki Nakamura

Masao Hori

Naotoshi Ogawa

Tsuyoshi Wakazono

Yu Inomoto

Akihiko Yuki

Haruko Kono

Chifumi Matsuura

Takeshi Ono

Masayuki Miyamoto

Nobuyuki Miyazawa

Shoichi Takemoto

Masato Hirose

Fumiaki Usui

Naoki Hasegawa

Takahiro Yoshimi

Yotaro Sanjo

Mari Sasaki

Masanobu Kimoto

Yuji Anami

Yoshinori Ota

Hideyuki Yoshimura

Kaoru Kamiyama

Hiroshige Hayakawa

Atsuro Hirakawa

Akihiro Shironouchi

A zoom lens includes, in order from an object side to an image side, a lens unit closest to the object side and having a positive refractive power, an intermediate unit including at least three lens units and an aperture stop, and a lens unit closest to the image side and having a positive refractive power. A distance between each pair of adjacent lens units changes in zooming. The lens unit closest to the object side is configured not to move for zooming, and the at least three lens units and the aperture stop are configured to move in zooming. The lens unit closest to the image side includes a first positive lens. A predetermined condition is satisfied.

Zoom lens and image pickup apparatus

A reduction optical system disposed on an image side of a main optical system, a composite focal length of the main optical system and the reduction optical system being shorter than a focal length of the main optical system, includes a first lens element disposed closest to an object side and having a positive refractive power, a second lens element disposed closest to an image side and having a positive refractive power, and a positive lens and a negative lens disposed between the first lens element and the second lens element.

Reduction optical system and image pickup apparatus

A reduction optical system (Gr) disposed on an image side of a main optical system is configured such that a composite focal length of the main optical system and the reduction optical system is shorter than a focal length of the main optical system. The reduction optical system has a positive refractive power, and includes a plurality of positive lenses and a plurality of negative lenses. The reduction optical system satisfies inequalities with respect to a lateral magnification of the reduction optical system disposed on the image side of the main optical system, a focal length of the reduction optical system, a focal length of a positive lens Gp1 included in the plurality of positive lenses, and a refractive index of the positive lens Gp1.

A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, and a subsequent unit including a plurality of lens units, The first lens unit is configured not to move for zooming. A distance between each pair of adjacent lens units changes in zooming. The subsequent unit includes, in order from the image side to the object side, a lens having a positive refractive power and configured not to move for zooming, a moving positive lens unit consisting of one or two lenses, having a positive refractive power, and configured to move in zooming, and a diaphragm configured to move in zooming. The diaphragm is closer to the object side at the wide-angle end than at the telephoto end. A predetermined condition is satisfied.

A zoom lens consists of in order from an object side to an image side: a first lens unit having a positive refractive power and configured not to move for zooming; three or four moving lens units configured to move in zooming; an aperture stop; and one or two rear lens units including a rear lens unit closest to the object side and configured not to move for zooming. An interval between each pair of adjacent lens units is changed in zooming. The three or four moving lens units include a moving lens unit having a negative refractive power. The three or four moving lens units include a rear positive lens unit closest to the image side and having a positive refractive power. The first lens unit includes three positive lenses. Conditional expressions are satisfied by the zoom lens.

Provided is a zoom lens including, in order from an object side: a positive first unit not moving for zooming; one or two moving units move for zooming and including a negative unit; a negative unit moving for zooming; a positive unit including a stop and moving for zooming; and a positive final unit not moving for zooming. The distances on the optical axis, from surface, closest to the object side, of the first unit to a surface, closest to an image side, of the first unit, from the surface, closest to the object side, of the first unit to the stop at the wide angle end, from the surface, closest to the image side, of the first unit to the stop at the wide angle end, and the maximum distance from the surface, closest to the image side, of the first unit to the stop are appropriately set.

A zoom lens includes, from the object side, a positive first lens unit not moving for zooming, a negative second lens unit moving for zooming, and a positive third lens unit moving for zooming. The second lens unit includes a negative lens closest to the object side, the third lens unit consists of a-sub-lens unit and a-sub-lens unit from the object side. Conditional expressions&#x2212;18.0&#x3c;1/2&#x3c;&#x2212;3.0,0.2&#x3c;21/2&#x3c;3.6,&#x2212;0.95&#x3c;21/2&#x3c;&#x2212;0.25,7.0&#x3c;&#x3b2;2/&#x3b2;2&#x3c;125.0, and0.3&#x3c;31/32&#x3c;2.5,are satisfied where f1, f2, and f21 are the focal lengths of the first lens unit, the second lens unit, and the negative lens, r2 is an image-side radius of curvature of the negative lens, &#x3b2;2w and &#x3b2;2t are the lateral magnifications of the second lens unit at the wide angle end and the telephoto end, and f31 and f32 are the focal lengths of the-sub-lens unit and the-sub-lens unit.

A zoom lens consists of, in order from the object side to the image side, a first lens unit having a positive refractive power and configured not to be moved for zooming, a second lens unit having a negative refractive power and configured to be moved for zooming, and a rear lens group including at least one lens unit. The first lens unit includes at least six lenses, a lens closest to the object side included in the first lens unit is a negative lens, and the zoom lens satisfies conditional expressions: &#x2212;1.65&#x3c;f1n/f1&#x3c;&#x2212;1.10; 37&#x3c;&#x3bd;1n&#x3c;48; and 87&#x3c;&#x3bd;pave&#x3c;100, where f1n is a focal length of the negative lens, &#x3bd;1n is an Abbe number of the negative lens with respect to d-line, f1 is a focal length of the first lens unit, and &#x3bd;pave is an average of Abbe numbers of positive lenses included in the first lens unit with respect to d-line.

An apparatus includes, in order from an object side to an image side, a focusing lens group, a zoom lens group, and a relay lens group. The relay lens group includes an extender group and a correction lens group. The apparatus includes a temperature detector, a storage storing information relating to a moving amount of the correction lens group, and a controller configured to control a position of the correction lens group. The storage stores first information relating to the moving amount for correction of focus movement due to change in a temperature and insertion of the extender group. The controller obtains the moving amount based on the temperature and the first information. A specific conditional expression is satisfied.

Lens apparatus and image pickup apparatus

A zoom lens includes, in order from the object side, a positive first lens unit not moving for zooming, a negative second lens unit moving for zooming, positive third and fourth lens units moving for zooming, and a positive fifth lens unit not moving for zooming. Intervals between adjacent ones of the first to fifth lens units change for zooming. The third lens unit consists of positive, positive, and negative lenses in order from the object side. Appropriate settings are made to the zoom lens's focal lengths at the wide angle and telephoto ends, the lateral magnifications of the second lens unit at the wide angle and telephoto ends, the focal lengths of the third lens unit and the negative lens in the third lens unit, and the average Abbe number of the positive lenses and the Abbe number of the negative lens in the third lens unit.

A zoom lens includes in order from an object side: a positive first lens unit not moving for zooming; a negative second lens unit moving for zooming; a negative third lens unit moving for zooming; an intermediate lens group including a lens unit and moving for zooming; and a rear lens group including a lens unit, a lens unit, closest to an object of the zoom lens, not moving for zooming, an aperture stop being placed on a side of the object to or in the rear lens group, a distances between each pair of adjacent lens units changes for zooming, and a distance between the second and third lens units at a wide angle end, a distance between the second and third lens units at a telephoto end, and a maximum distance between the second and third lens units in a certain zoom range are appropriately set.

Zoom lens and image pickup apparatus having the same

An image pickup apparatus includes: a mount to which an interchangeable lens is mountable; an image sensor; an optical system having a refractive power and imaging an object point located on an image side of a most-object-side surface of the optical system onto the image sensor; and an optical filter arranged between the optical system and the image sensor, and a distance on an optical axis from a flange surface of the mount to the object point located on the image side of the most-object-side surface, a distance on the optical axis from the flange surface of the mount to the image pickup element, and a lateral magnification of the optical system when the interchangeable lens is mounted to the image pickup apparatus and the object point located on the image side of the most-object-side surface, is imaged onto the image pickup element, are appropriately set.

Image pickup apparatus, rear attachment lens, and image pickup system including the same

A zoom lens, includes, in order from object side: a front unit including a unit including a first unit arranged closest to the object side and not moving for zooming; an Nf unit including three or more lenses and having a negative refractive power; an stop; a first rear unit moving during zooming; a second rear unit moving during zooming; and a third rear unit not moving for zooming, in which: the front unit includes four or more lenses and includes one or more units having a positive refractive power; and a difference between positions of the first rear unit at a wide angle end and a telephoto end, a difference between positions of the second rear unit at the wide angle end and the telephoto end, a focal length of the second rear unit, and a focal length of the zoom at the wide angle end are appropriately set.

Zoom lens and image pickup apparatus including the same

A zoom lens includes, in order from object side: a positive first unit not moving for zooming; a second unit moving during zooming; a positive third unit; a positive fourth unit; and a rear unit including at least one unit, the second unit including one or more lens sub-units and having a negative refractive power as a whole, the fourth unit moving during zooming, the zoom lens including a stop between the second and third units or between the third and fourth units. Lateral magnifications of the second unit at a wide angle end and a telephoto end when beam enters from infinity, focal lengths at the wide angle end and the telephoto end, a focal length of the first unit, and a focal length of the second unit at the wide angle end are appropriately set.

Growing community of inventors

Utsunomiya, Japan

Kazuya Shimomura