Nikon Corporation

Konica Minolta, Inc.

Nkon Corporation

Nikor Corp.

Haruo Sato

Issei Tanaka

Mami Muratani

Takeshi Suzuki

Yoko Kimura

Hiroshi Yamamoto

Satoshi Miwa

Hideo Kanno

Atsushi Shibayama

Kenzaburo Suzuki

Yoshinari Hamanishi

Mamoru Terada

Keiko Yamada

Kiyotaka Inadome

Taku Matsuo

Masahiro Nakatsuji

Motohisa Mouri

Wataru Tatsuno

Yoshikazu Sugiyama

Ryosuke Imajima

Kana Inoue

An imaging lens comprises in order from an object, a first lens group of positive refractive power, a second lens group of positive refractive power, and a third lens group of negative refractive power. In focusing from infinity to a close object, the first lens group is fixed in position, and the second lens group and the third lens group are moved so that the distance between the first lens group and the second lens group is reduced, and the distance between the second lens group and the third lens group is increased. Further, the following conditional expression (1) is satisfied:1.0&#x3c;1/&#x3c;2.5&#x2003;&#x2003;(1)

Imaging lens, imaging optical device, digital device, and method of manufacturing imaging lens

The art has, disposed in order from an object, a first lens group (G) having positive refractive power, a second lens group (G) having negative refractive power, a third lens group (G) having negative refractive power, and a fourth lens group (G) having positive refractive power, in which zooming is made by varying an air distance between the first lens group (G) and the second lens group (G), and the following conditional expression (1) is satisfied:0.60&#x3c;4/&#x3c;1.15&#x2003;&#x2003;(1)where f4 denotes a focal distance of the fourth lens group (G), and fw denotes a focal distance of a zoom lens in a wide-angle end state upon focusing on infinity.

Zoom lens, imaging device and method for manufacturing the zoom lens

An optical system includes, disposed in sequence along an optical axis starting on an object side: a first lens group having a positive refractive power, which remains fixed relative to an image surface upon focusing; and a second lens group having a positive refractive power, which moves along the optical axis upon focusing, wherein: the first lens group includes: a first partial lens group that comprises at least two positive lenses and has a positive refractive power; and a negative lens, the second lens group includes: at least one meniscus lens with a convex surface thereof facing the object side; a second partial lens group that includes at least one negative lens and at least one positive lens, and has a positive refractive power; and a cemented lens that is formed by bonding together a plurality of lenses and has a positive refractive power, wherein: a predetermined conditional expression is satisfied.

Optical system, image-capturing device comprising optical system and method for manufacturing optical system

A zoom lens has, in order from an object: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having positive refractive power. Zooming is performed by changing an air gap between the lens groups. The fourth lens group includes, in order from the object, a first positive lens component, a second positive lens component having a convex surface facing the object, and a negative lens component. A specified conditional expression is satisfied.

A zoom lens including, from an object: a front group having negative power; and a rear group having positive power, the rear group including, from the object, a positive lens, a negative lens having a concave surface facing the object, a cemented positive lens constructed by a negative lens and a positive lens, and a cemented lens constructed by a positive lens and a negative lens, the rear group further including a focusing group disposed to the object side of the positive lens La for focusing from infinity to a close object by moving from the object side to an image side, a distance between the front group and the rear group being varied thereby zooming from a wide-angle end state to a telephoto end state, and given condition being satisfied, thereby providing a downsized zoom lens having wide angle of view and excellent optical performance with fewer lenses.

Zoom lens, imaging apparatus, and method for manufacturing zoom lens

A zoom lens has, in order from an object, a first lens group (G) having positive refractive power; a second lens group (G) having negative refractive power; a third lens group (G) having positive refractive power; and a fourth lens group (G) having positive refractive power. Zooming is performed by changing an air gap between the lens groups. The fourth lens group (G) includes, in order from the object, a lens component (La) having positive or negative refractive power, a positive lens component (Lb), and a positive lens component (Lc) having a convex surface facing the object. Specified conditional expressions are satisfied.

A zoom lens system having a negative first lens group and a positive second lens group, from an object side, and achieving zooming by varying a group-to-group distance. The second lens group includes a three-element cemented lens which is a set of three lens elements cemented together including, from the object side, a negative first lens, a positive second lens, and a negative third lens, and the three-element cemented lens fulfills conditional formulas 0.08&#x3c;(rs+rs)/(rs&#x2212;rs)&#x3c;0.5, 27&#x3c;v-v&#x3c;40, 20&#x3c;v-v&#x3c;38 (rs, rsrepresent the curvature radius of the sides of cemented surfaces of the three-element cemented lens on the object side and the image side respectively, and v-represent the Abbe numbers of the first to third lenses of the three-element cemented lens).

Zoom lens system, imaging optical device, and digital appliance

A zoom lens system includes, in order from an object, a front group G1 having negative refractive power, a rear group G2 having positive refractive power, zooming being conducted by varying a distance between the front group G1 and the rear group G2, the front group G1 including at least a negative lens and a positive lens, and the rear group G2 including, in order from an object side, a first partial group LA having positive refractive power, a second partial group LB having negative refractive power, a third partial group LC having positive refractive power and a negative lens LD, and predetermined conditions being satisfied, thereby providing a zoom lens system which is compact in size, and has small back focus and excellent optical property.

Zoom lens system, imaging apparatus, and method for manufacturing zoom lens system

Including: a front lens group Gf disposed to an object side of an aperture stop; and a rear lens group Gr disposed to an image side of the aperture stop; the front lens group including a sub-lens group Ga having negative refractive power, the sub-lens group Ga including, in order from the most object side, at least three negative lenses, at least one of the three negative lens being an aspherical negative meniscus lens, the aspherical negative meniscus lens having a shape that negative refractive power is getting smaller from the center to the periphery, a cemented lens constructed by a positive lens, a negative lens, and a positive lens being disposed to the image side of the sub-lens group Ga, and given conditional expressions being satisfied, thereby providing a wide-angle lens having high optical performance with a wide angle of view.

Wide-angle lens, imaging apparatus, and method for manufacturing wide-angle lens

The present invention relates to a zoom lens which can shift images using a movable optical system so as to have components orthogonal to the optical axis, and can correct hand motion blur, and minimizes the deterioration of performance while attempting higher variable power. This zoom lens has, in order from an object, a first lens group Ghaving positive refractive power, a second lens group Ghaving negative refractive power, a third lens group Ghaving positive refractive power, a fourth lens group Ghaving negative refractive power, and a fifth lens group Ghaving positive refractive power, and at least a part of the fourth lens group Gcan move so as to have components orthogonal to the optical axis, and a distance between each lens group is changed upon zooming from a wide-angle end state to a telephoto end state, and the following conditional expression is satisfied, 0.01&#x3c;f/ft&#x3c;0.30, where fdenotes a focal length of the fifth lens group, and ft denotes a focal length of the zoom lens upon focusing on infinity in the telephoto end state.

Zoom lens, optical apparatus having same, and method of manufacturing zoom lens

An imaging lens SL mounted in a digital single lens reflex camerais composed of, in order from an object side, a first lens group Ghaving negative refractive power, a second lens group Ghaving positive refractive power, and a third lens group Ghaving positive refractive power, wherein upon focusing on a near-distance object point from an infinite-distance object point, at least one of the first lens group Gand the second lens group Gis moved so as to change a distance between the first lens group Gand the second lens group Gand the imaging lens satisfies a given conditional expression, thereby providing a downsized imaging lens suited to an imaging apparatus such as a single lens reflex camera, having a less of change in overall length and optimal to driving an intra-lens-barrel motor.

Imaging lens, optical apparatus including imaging lens and method for manufacturing imaging lens

The zoom lens is configured having, in order from an object, a first lens group (G) having positive refractive power, a second lens group (G) having negative refractive power, a third lens group (G) having positive refractive power, and a fourth lens group (G) having positive refractive power. The distance between each lens group is changed upon zooming from a wide-angle end state to a telephoto end state, the third lens group (G) has, in order from the object, a thirty first lens group (G) having positive refractive power (positive lens group), and a thirty second lens group (G) having negative refractive power (negative lens group), the thirty second lens group (G) is moved so as to have components orthogonal to the optical axis, and the condition of the expression 2.6&#x3c;|X|/fw&#x3c;8.0 is satisfied, where Xdenotes a moving distance of the first lens group (G) upon zooming from the wide-angle end state to the telephoto end state, and fw denotes a focal length of the zoom lens in the wide-angle end state.

A zoom lens system ZL mounted in an electronic still cameraetc is constructed to include, in order from an object side, a first lens group Ghaving negative refractive power and a second lens group Ghaving positive refractive power, in which the second lens group Ghas two cemented lenses. A distance between the first lens group Gand the second lens group Gchanges when a lens position state changes from a wide-angle end state to a telephoto end state, thereby providing the zoom lens system exhibiting preferable optical performance, an optical apparatus including the zoom lens system and a magnification varying method using the zoom lens system.

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Kawaguchi, Japan

Haruo Sato