Canon Kabushiki Kaisha

Kenji Shinohara

Akihisa Horiuchi

Kenji Obu

Daisuke Ito

Ken Wada

Nobuyuki Miyazawa

Takeo Mori

A zoom lens includes, in order from an object side to an image side, a first lens unit having negative refractive power and a second lens unit having positive refractive power. A distance between adjacent lens units changes during zooming. The first lens unit includes a plurality of lenses, the plurality of lenses consisting of a negative lens having a concave lens surface on the image side, and a positive lens having a convex lens surface on the object side and disposed on the image side of the negative lens via an air gap. A predetermined condition is satisfied.

Zoom lens, image pickup apparatus having the same, and imaging system

An optical system includes, in order from an object side to an image side, a positive first lens unit (L1), a negative second lens unit (L2), a positive third lens unit (L3), and a negative fourth lens unit (L4), wherein distances between adjacent lens units change during focusing, at least the L2 and the L4 move during focusing, the L4 consists of negative and positive partial units, an air distance between the negative and positive partial units is the largest among those between adjacent lenses in the L4, and 0.45&#x3c;D4np/D4&#x3c;0.95 is satisfied, D4 being a distance on an optical axis from a most object-side lens surface to a most image-side lens surface in the L4 and D4np being the air distance between the negative partial unit and the positive partial unit in L4.

Optical system and optical apparatus

A zoom lens according to the present invention includes, in order from an object side to an image 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, in which a distance between adjacent lens units varies during zooming, the configuration of the second lens unit, the curvature radius Rbobj of a lens surface of a cemented lens GRbon the object side included in the second lens unit, the curvature radius Rbimg of a lens surface of the cemented lens GRbon the image side, the focal length f2img of the cemented lens GRband the focal length fof the second lens unit are appropriately set.

Zoom lens and image pickup apparatus including the same

A zoom lens includes, in order from an object side to an image side thereof, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power. A distance between adjacent ones of the lens units changes during zooming. The first lens unit consists of, in order from the object side to the image side thereof, one negative lens element and one positive lens element. Lengths of travel M1 and M2 of the first lens unit and the second lens unit, respectively, during zooming from a wide-angle end to a telephoto end, focal lengths f1 and f2 of the first lens unit and the second lens unit, respectively, and a zoom ratio Z of the zoom lens are set appropriately.

A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power, and is configured to move the second lens unit, the third lens unit, and the fourth lens unit during a zooming operation to change an interval between adjacent lens units. A moving amount of the second lens unit during a zooming operation from a wide angle end to a telephoto end, a focal length of the second lens unit, and transverse magnification of the third lens unit at the wide angle end and the telephoto end are individually set appropriately.

Zoom lens and image pickup device including the same

A zoom lens includes, in order from an object side to an image side, a first lens unit having negative refractive power, a second lens unit having positive refractive power, a third lens unit having negative refractive power, and a fourth lens unit having positive refractive power. During zooming, a distance between every adjacent lens unit from the first to fourth lens units varies. A focal length fw of the entire zoom lens at a wide-angle end, a focal length f1 of the first lens unit, and a focal length f4 of the fourth lens unit are appropriately set according to predetermined mathematical conditions.

Zoom lens and image pickup apparatus having the same

A zoom lens including first to fifth lens units in order from an object side toward an image. The refractive powers of the first to the fifth lens units are positive, negative, positive, negative and positive, respectively. The distance between the first and the second lens units is increased at the time of zooming from the wide angle end to the telephoto end, and the distance between the second and the third lens unit is decreased at the time of zooming from the wide angle end to the telephoto end. The first lens unit and the fourth lens unit are fixed for the zooming. When M2 and M3 are the amounts of movement of the second lens unit and the third lens unit at the time of zooming from the wide angle end to the telephoto end, respectively, the conditional expression; 0.2&#x3c;|M2/M3|&#x3c;5.0 is satisfied.

Zoom lens and image pickup apparatus equipped with zoom lens

A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power. The second lens unit and the fourth lens unit move during zooming. The third lens unit includes at least one positive lens and at least one negative lens. When Rnf and Rnr are radiuses of curvature of surfaces on the object side and the image side respectively of one negative lens of the second lens unit, Rpf and Rpr are radiuses of curvature on the object side and the image side respectively of one positive lens of the second lens unit, the following conditions are satisfied:3.4&#x3c;()/()&#x3c;4.4&#x2212;0.7&#x3c;()/()&#x3c;&#x2212;0.5.

Zoom lens and optical apparatus having the zoom lens

A zoom lens comprising, in order from an object side to an image side, a first lens unit of a positive refractive power, a second lens unit of a negative refractive power, a third lens unit of a positive refractive power, and a fourth lens unit of a positive refractive power. In zooming, the first lens unit is configured fixed and the second, third, and fourth lens units are configured movable. The following conditions are satisfied where f3st is a movement amount of the third lens unit associated with zooming from a wide angle end to a telephoto end, f3 is a focal length of the third lens unit, &#x3b2;2w is a lateral magnification of the second lens unit at the wide angle end, and z is a zoom ratio, 0.010&#x3c;(|f3st|/f3)/z&#x3c;0.045, and &#x2212;0.33&#x3c;&#x3b2;2w&#x3c;&#x2212;0.20.

A small zoom lens having a high zoom ratio and high optical performance over an entire zoom range is obtained. The zoom lens includes, in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; a fourth lens unit having a negative refractive power; and a fifth lens unit having a positive refractive power, wherein intervals between the first lens unit, the second lens unit, the third lens unit, the fourth lens unit, and the fifth lens unit are changed during zooming, in which a focal length (fw) of an entire system at a wide angle end and a focal length (fn) of an n-th lens unit are set appropriately.

A zoom lens including four lens units having positive, negative, positive, and positive refractive power in order from an object side to an image side thereof, wherein the distance between the adjacent lens units changes when zooming: wherein the third lens unit includes, in order from the object side to the image side, a first lens subunit having negative refractive power and a second lens subunit having positive refractive power. The zoom lens is configured to displace an image formed by the zoom lens in a direction perpendicular to its optical axis by moving the second lens subunit so as to have a component perpendicular to the optical axis, wherein the curvature radius of a surface, closest to the object, of the first lens subunit and the curvature radius of a surface second closest to the object, of the first lens subunit are set at appropriate values.

Zoom lens and camera having the same

A zoom lens includes a first lens unit with a negative refractive power, a second lens unit with a positive refractive power, and a third lens unit with a positive refractive power in order from the object side to the image side. The first lens unit includes a negative lens and a positive lens. When the curvature radius of the object side surface and that of the image side surface of the negative lens are respectively defined as Rand Rand the curvature radius of the object side surface and that of the image side surface of the positive lens are respectively defined as Rand R, the following conditional expression is satisfied: &#x2212;5.6&#x3c;(R+R)/(R&#x2212;R)&#x3c;&#x2212;4.7 and 1.5&#x3c;(R+R)/(R&#x2212;R)&#x3c;2.3.

Zoom lens and image pickup apparatus using the same

A zoom lens includes, in order from an object side to an image side, first through fourth lens units. The first lens unit has positive refractive power, and the second lens unit has negative refractive power. The third lens unit has positive refractive power, the third lens unit having at least one positive lens and a plurality of negative lenses that include, in order from the object side to the image side, a first positive lens, a first negative lens, and a second negative lens. The fourth lens unit has positive refractive power. The zoom lens performs zooming by changing the distance between the lens units. The first positive lens is a positive lens closest to the object side among the at least one positive lens. The first negative lens is a negative lens closest to the object side among the plurality of negative lenses.

Zoom lens and image pickup apparatus having zoom lens

A zoom lens system includes, in order from an object side to an image side, first, second, third, and fourth lens units having positive, negative, positive, and positive optical powers, respectively. The first lens unit includes one negative lens element and two positive lens elements, and moves during zooming. The zoom lens system satisfies the following condition:0.05&#x3c;1/(1&#xd7;)&#x3c;0.21.5&#x3c;&#x3b2;3/&#x3b2;3&#x3c;3.6where fdenotes a focal length of the first lens unit, stdenotes a distance between positions of the first lens unit at a wide-angle end and at a telephoto end, fw and ft denote focal lengths of the entire system at the wide-angle end and at the telephoto end, respectively, and &#x3b2;W and &#x3b2;T denote lateral magnifications of the third lens unit at the wide-angle end and at the telephoto end, respectively.

Zoom lens system and image pickup apparatus including the same

A zoom lens device includes, from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power. The zoom lens device is formed so that a distance Ximg between a position of the first lens unit at the wide-angle end and a position of the first lens unit that is maximally moved towards the image side, a distance Xobj between the position of the first lens unit at the wide-angle end and a position of the first lens unit that is maximally moved towards the object side, and a focal length fw of the zoom lens device at the wide-angle end are suitable values.

Growing community of inventors

Utsunomiya, Japan

Kenji Shinohara