Sony Corporation

Motoyuki Otake

Toshihiro Sunaga

Masaharu Hosoi

Naoki Miyagawa

Yoshito Iwasawa

Daisuke Kuroda

Makoto Kanai

Takeshi Hatakeyama

Masaki Maruyama

Yumiko Uehara

Kouji Katou

A variable focal length lens system includes: first to fourth lens groups alternately having negative and positive refractive power; and an aperture stop; the first to fourth lens group being arranged to allow a space between the first and second lens groups to be decreased and spaces between the second and third lens groups and between the third and fourth lens groups to be varied, the third lens group travelling to allow image-plane position variation caused by subject position variation to be compensated and satisfying a following conditional expression,0.05&#x3c;3&#x3c;0.5&#x2003;&#x2003;(1) where Da is a distance from the aperture stop to a most image-sided lens surface in the third lens group in the wide end state, and R3is a curvature radius of the most-image sided lens surface in the third lens group.

Variable focal length lens system and image pickup unit

Disclosed herein is a variable focal length lens system including: a first lens group having a positive refracting power; a second lens group having a negative refracting power; a third lens group having a negative refracting power; a fourth lens group having a positive refracting power; and a fifth lens group having a positive refracting power; all of the first to fifth lens groups moving, when a positional state of the variable focal length lens system changes from a wide angle end state to a telephoto end state; the fifth lens group being configured from a first sub lens group and a second sub lens group; and the variable focal length lens system satisfying the following expression (1):0.5&#x3c;sub/&#x3c;0.9.

Variable focal length lens system and image pickup apparatus

There is provided An imaging lens including a first lens group having a positive refractive power, an aperture stop, and a second lens group having a positive refractive power that are configured to be arranged sequentially from an object side to an image side. Focus is achieved by fixing the first lens group in an optical axis direction and moving the second lens group from the image side to the object side when a subject distance is changed from infinity to proximity. The first lens group includes an object-side lens group having a negative refractive power and an image-side lens group having a positive refractive power that are configured to be arranged sequentially from the object side to the image side. In an air space of the first lens group, an air space between the object-side lens group and the image-side lens group is set to be maximum.

Imaging lens and imaging apparatus

A zoom lens includes: first, second, third and fourth lens groups having negative power, positive power, negative power and positive power, respectively, and sequentially arranged from an object side toward an image side. When the magnification at a wide angle side is changed to the magnification at a telescopic side, the first lens group is so moved along an optical axis that the distance between the first lens group and the second lens group decreases, and the second third and fourth lens groups are moved from the image side toward the object side, the third lens group is moved along the optical axis for focusing, and the zoom lens satisfies the following conditional expression (1)&#x2212;2.0&#x3c;3/&#x221a;()&#x3c;&#x2212;0.3&#x2003;&#x2003;(1)where f3, fw and ft represent the focal lengths of the third lens group, the entire lens system at the wide angle end, and the entire lens system at the telescopic end, respectively.

Zoom lens and imaging apparatus

Provided is an imaging lens including a fixed first lens group having a positive refractive power and including a plurality of lenses, a second lens group serving as a focus group and including a negative lens, and a third lens group having a positive refractive power that are arranged sequentially from an object side to an image side. A stop is disposed between predetermined lenses of the first lens group, and, on an assumption that a lens group located closer to the object side than the stop of the first lens group is a 1alens group and a lens group located closer to the image side than the stop is a 1blens group, Condition Equation (1) below is satisfied:0.7&#x3c;1&#x3c;2.0,&#x2003;&#x2003;(1)where f is a focal distance of an entire system and f1b is a focal distance of the 1blens group.

Provided is an imaging lens including a fixed first lens group having a negative refractive power, a second lens group having a positive refractive power, a stop, a third lens group including a cemented lens, a fourth lens group including a positive lens, a fifth lens group serving as a focus group and including a negative lens, and a sixth lens group including a positive lens that are arranged sequentially from an object side to an image side.

A zoom lens includes: a first lens group having negative refractive power; a diaphragm; a second lens group having positive refractive power; a third lens group having negative refractive power; and a fourth lens group having positive refractive power, arranged in order from an object side. The first lens group is configured by at least one negative lens and one positive lens. The third lens group is configured by one negative lens. Then power is changed from a wide angle end state to a telephoto end state, the first, second, and third lens groups are moved in the direction of an optical axis, and the fourth lens group is fixed. When focusing, the third lens group is moved in the direction of the optical axis so as to satisfy the following Conditional Equations,&#x2212;2.8&#x3c;3/&#x3c;&#x2212;0.5&#x2003;&#x2003;(1)2.0&#x3c;4/&#x3c;15.0&#x2003;&#x2003;(2).

An object is to reduce the effect of defocusing due to the movement of an image plane when a shifting lens group movable in a direction perpendicular to the optical axis for correcting hand jiggling is positionally deviated along the optical axis, thereby maintaining high optical performance at the time of correcting hand jiggling. A zoom lensincludes a plurality of lens groups with distances between the lens groups being changed for variable power. A final lens group Lwhich is positioned most closely to an image side has a sub lens group GS (G) having a positive refractive power and a sub lens group GR (G) disposed adjacent to the sub lens group GS (G) on the image side and having a positive refractive power. The sub lens group GS is shiftable in a direction perpendicular to the optical axis for correcting image blurs. The sub lens group GS has a lateral magnification &#x3b2;s and the sub lens group GR has a lateral magnification &#x3b2;R, the lateral magnifications satisfying the following conditional expressions (), ():&#x3b2;s&#x3c;1&#x2003;&#x2003;(1)0&#x3c;&#x3b2;R&#x3c;1&#x2003;&#x2003;(2)

Zoom lens and imaging capturing device

A zoom lens wherein the image plane movement upon lens shifting is minimized. A power variation section and a final lens group are disposed in order from an object side. The power variation section includes at least two lens groups movable in an optical axis direction to vary a lens position state. The final lens group is fixed in the optical axis direction and includes first to third sub groups having negative, positive and positive refracting powers and disposed in order from the object side. The second sub group is shiftable substantially perpendicularly to the optical axis to shift an image. A conditional expression 0.2&#x3c;ft/fBt&#x3c;0.8 is satisfied where ft and fBt are the focal distances of the lens system and entire lens groups disposed on the object side of the third sub group in the telephoto end state.

Zoom lens and image pickup apparatus

A varifocal zoom lens includes: a first lens group having a negative refractive power; a second lens group having a positive refractive power, including a cemented lens component Lformed by combining a positive lens having a convex surface on the object side and a negative lens having a concave surface on an image side and a positive lens component Ldisposed on the image side with respect to the cemented lens component L, spaced from the cemented lens component Lby an air space and having a convex surface on the object side and disposed behind the first lens group with respect to an object side; and a third lens group having a positive refractive power and disposed behind the second lens group with respect to the object side. At least the first and the second lens group are moved and the second lens group is moved toward the object side so as to decrease an interval between the first and the second lens group, when a lens state is changed from a shortest-focal-length lens state to a longest-focal-length lens state, an aperture stop is disposed between the first and the second lens group, and the second lens group includes and satisfies conditions expressed by:0.02&#x3c;/()&#x3c;0.1&#x2003;&#x2003;(1)0.6&#x3c;&#x3c;0.8&#x2003;&#x2003;(2)where Dis the length of an air space between the cemented lens component Land the positive lens component L, Ris the radius of curvature of the surface on the object side of the positive lens component L, Ris the radius of curvature of the surface on the image side of the cemented lens component L, and Dis the distance between the aperture stop and the surface on the image side of the cemented lens component L

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Saitama, Japan

Motoyuki Otake