Minolta Company, Ltd.

Konica Minolta Photo Imaging, Inc.

Minolta Camera Kabushiki Kaisha

Konica Minolta Opto, Inc.

Konica Minolta Advanced Layers, Inc.

Sony Corporation

Nikon Corporation

Minolta Camera Co., Ltd.

Hiroyuki Matsumoto

Atsuo Masui

Tetsuo Kohno

Takashi Okada

Tsutomu Honda

Manabu Inoue

Katsuyuki Nanba

Shigeru Wada

Yuichiro Ori

Yoshihito Souma

Hirokazu Yagura

Kouji Hamaguchi

Akio Miyata

Osamu Okubo

Hideki Nagata

Kazuhiko Ishimaru

Hiromu Mukai

Soh Ohzawa

Hitoshi Hagimori

Masafumi Sueyoshi

Mamoru Terada

Hideo Kajita

Tetsuya Arimoto

Hiroki Harada

Masaharu Hosoi

Shoji Kogo

Hisanori Itoh

Tatsuya Suzuki

Hiromichi Nose

Yutaka Inoue

Mitsuko Date

Takuya Ueno

Junji Mori

Kyoko Yamaguchi

Yasushi Hasegawa

Masakuni Tai

Tomoo Doi

Kana Inoue

A large aperture zoom optical system and an image pickup apparatus have a five-lens-group arrangement of positive-negative-positive-negative-positive refractive powers. At the time of zooming, the fifth lens group is fixed, and at least the second lens group, the third lens group and the fourth lens group are moved. The third lens group for use in focusing is composed of a single lens element.

Large aperture zoom optical system and image pickup apparatus

A zoom lens system is composed of negative, positive, negative, and positive lens groups, of which at least the first to third move during zooming. During zooming from the wide-angle end to the telephoto end, the distance between the first and second lens groups decreases, the distance between the second and third lens groups varies, and the distance between the third and fourth lens groups increases. The conditional formulae 1.0&#x2266;|f2/f1|&#x2266;1.5 and 2.0&#x2266;|f4/f1|&#x2266;5.0 are fulfilled (f1, f2, and f4 representing the focal lengths of the first, second, and fourth lens groups).

Zoom lens system, imaging optical device, and digital appliance

A zoom lens including first, second, and third lens groups having positive, negative, and positive refractive powers, respectively, which are arranged in that order from the object side to the image side such that, when zooming from wide-angle to telephoto, the first lens group moves to the object side, and spacings between the lens groups change. The third lens group has at least two lenses including a first lens, which is a positive lens arranged closer to the object side than the other lenses of the third lens group. Blur correction is performed by moving the first lens perpendicularly to the optical axis. The third lens group is configured such that the following conditional expression is satisfied: 0.3&#x3c;(1&#x2212;&#x3b2;kFW)&#xb7;&#x3b2;kRW&#x3c;1.9, where &#x3b2;kFW and &#x3b2;kRW are the lateral magnifications at wide-angle of, respectively, the first lens and the remaining lenses of the third lens group.

Zoom lens and imaging apparatus

A wide-angle lens LN consists of, in order from an object side: a first lens group Grhaving positive refractive power; and a second lens group Grhaving positive refractive power; the second lens group Gris movable toward the object side with fixing the first lens group Gr, thereby carrying out focusing on a close object, and a given conditional expression is satisfied. Therefore, a wide-angle lens having high optical performance with suppressing variation in aberrations upon focusing in spite of being a large aperture, an imaging optical apparatus equipped therewith, and a digital equipment are provided.

Wide-angle lens, imaging optical apparatus and digital equipment

A zoom lens system includes, in order from an object side: a first lens group having a negative optical power, a second lens group having a negative optical power, and, a third lens group having a positive optical power. The position of the first lens group is fixed during zooming, and the third lens group includes three single lenses including, in order from the object side, a third-first lens being a single lens having a positive optical power, a third-second lens being a single lens having a negative optical power and a third-third lens being a single lens having a positive optical power. The zoom lens system satisfies the following conditional expression: 0.35&#x3c;L/f&#x3c;1.5 where Lrepresents the axial air gap distance between the third-second lens and the third-third lens and frepresents the focal length of the third lens group.

Zoom lens system, image pickup device and digital device

In zooming, an optical unit moves the lens unit located at the most image side and the image sensor along the optical axis while not moving at least one lens unit, of a plurality of lens units, other than the lens unit located at the most image side.

Optical unit and image capturing apparatus including the same

A zoom lens system includes, in order from an object side: a first lens group having negative power, a second lens group having negative power, a third lens group having positive power, and, a fourth lens group having positive power. The position of the first lens group is fixed during zooming, and the third lens group includes three single lenses including, in order from the object side, a third-first single lens having positive power, a third-second single lens having negative power and a third-third single lens having negative power. The zoom lens system satisfies the following conditional expression:0.4&#x3c;3/&#x3c;1.2where Lrepresents the axial air gap distance between the third-second lens and the third-third lens and fw represents the focal length of the entire system of the zoom lens system at a wide angle end position.

Zoom lens system and image pickup device

In a lens unit including a plurality of lens groups, the first, most object-side lens group includes a prism that changes the optical axis. In this lens unit, during zooming, while the first lens group is kept stationary, an image-sensing device is moved along the optical axis.

Lens unit and an image-sensing apparatus therewith

An image-taking lens unit has an image-taking lens system that forms an optical image of an object and an image sensor that receives the optical image in a rectangular image-sensing region and converts the optical image into an electrical signal. The image-taking lens system includes a reflective optical element that bends the optical path. Of the lens elements constituting the image-taking lens system, the most image-side lens element called the last lens element is molded of resin, and is given a non-circular outer shape fulfilling a prescribed condition.

Image-taking lens unit

A variable magnification optical system includes lens units that focus a ray of light from an object side on an image sensor, in which the lens unit located at a first position from the object side toward the image side includes an optical path changing element for changing an optical path. The variable magnification optical system performs magnification variation by changing gaps between the lens units, and satisfies predetermined conditional formulae.

Variable magnification optical system and image taking apparatus provided therewith

A variable-magnification optical system has, from the object side to the image side, at least a first lens group having a positive optical power, a second lens group having a negative optical power, and a third lens group having a positive optical power. The first lens group includes an optical prism that changes the optical path, and a prescribed conditional formula is fulfilled.

Variable-magnification optical system and image-taking apparatus therewith

A variable magnification optical system for forming an optical image of an object on the light receiving surface of the image sensor so that the magnification is variable includes from the object side: a first lens unit GRhaving negative optical power; a second lens unit GRhaving positive optical power; a third lens unit GRhaving positive optical power; and a fourth lens unit GRhaving positive or negative optical power. In magnification variation from the wide-angle end (W) to the telephoto end (T), at least first lens unit GRand the second lens unit GRare movable, and the fourth lens unit GRis stationary. An optical member having a wavelength selecting property is included in the fourth lens unit GR

Variable magnification optical system

A plurality of lens units in an optical unit has at least: from the object side toward the 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. When at least the first lens unit moves from the image side to the object side in zooming from the wide-angle end position to the telephoto end position, at least one gap between the lens units varies. Predetermined conditional formulae are satisfied.

Optical unit, and image taking apparatus provided therewith

A optical device has a zoom lens system that is comprised of a plurality of lens units and that achieves zooming by varying unit-to-unit distances and an image sensor that converts an optical image formed by the zoom lens system into an electrical signal. The zoom lens system is comprised of, from the object side, a first lens unit having a negative 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 zoom lens system achieves zooming by varying the distances between the first to fourth lens units.

Taking lens device

An optical device has zoom lens system comprised of plurality of lens units which achieves zooming by varying unit-to-unit distances and an image sensor that converts optical image formed by zoom lens system into an electrical signal. The zoom lens system is comprised of, from the object side, at least first lens unit having a negative optical power and second lens unit having a positive optical power. Following conditional formulae are fulfilled: 2<&verbar;f1/fw&verbar;<4, and 0.058<(tan &ohgr;w) &times;fw/TLw<0.9, where f1 represents focal length of first lens unit, fw represents focal length of entire optical system at wide-angle end, tan &ohgr;w represents half view angle at wide-angle end, and TLw represents total length (the distance from first vertex to image plane) at wide-angle end.

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Kishiwada, Japan

Hiroyuki Matsumoto