Panasonic Intellectual Property Management Co., Ltd.

Takahiro Kitada

Yoshiaki Kurioka

Takakazu Bito

Kunio Dohno

Yoshio Matsumura

Masafumi Sueyoshi

Shunichiro Yoshinaga

Takehiro Nishioka

Yuka Kudo

Yuka Ikegami

Jindong Li

An imaging optical system consists of: a first lens group having positive power; a second lens group having negative power; and a third lens group having positive power. The first lens group and the third lens group are fixed with respect to an image plane, with the second lens group moving along an optical axis, while the imaging optical system is focusing to make a transition from an infinity in-focus state toward a close-object in-focus state. The first lens group consists of: a sub-lens group GA; an aperture stop; and a sub-lens group GB. The sub-lens group GA includes: a lens LAhaving negative power; a lens LAhaving negative power; and a lens LAhaving negative power.

Imaging optical system, image capture device, and camera system

An imaging optical system includes lens group Gm located on that is closest to an object among lens groups in which a distance between the lens groups changes during zooming, the lens groups having negative power. Lens group Gm includes, in order from the object side toward an image side, lens element LGmFhaving the negative power, lens element LGmFhaving the negative power, both surfaces of lens element LGmFhaving an aspherical shape, and at least two lens elements having power. The present disclosure provides the imaging optical system having good various aberrations such as spherical aberration, astigmatism, and distortion and an imaging device and a camera system that are provided with the imaging optical system.

Imaging optical system, and imaging device and camera system provided with same

An imaging optical system includes: a first lens group having negative power; a second lens group having positive power; a third lens group having negative power; and a fourth lens group having power, which are arranged in this order such that the first lens group is located closest to an object and the fourth lens group is located closest to an optical image. The first lens group includes: a first negative lens; a second negative lens; and a third negative lens which is a meniscus lens having negative power and a convex surface facing the optical image, which are arranged in this order such that the first negative lens is located closest to the object and the third negative lens is located closest to the optical image. During focusing from an infinity focus point toward a close focus point, the third lens group moves along an optical axis.

A zoom lens system includes at least six lens groups, each of which has power. An interval between each pair of lens groups that are adjacent to each other among the at least six lens groups changes while the zoom lens system is zooming. Each of three lens groups, which are respectively located closest, second closest, and third closest to an image plane, out of the at least six lens groups consists of one or more bonded lenses.

Zoom lens system, and image capture device and interchangeable lens unit including the zoom lens system

A zoom lens system includes: a first lens group having positive power; a second lens group having negative power; a third lens group having positive power; a fourth lens group having negative power; and a fifth lens group having positive power. The first lens group is made up of a single lens. The second lens group is made up of four lenses. The zoom lens system is configured to zoom from a wide-angle end toward a telephoto end such that the fifth lens group does not move but the first to fourth lens groups move to change intervals between the lens groups.

Zoom lens system, image capture device, and camera system

An imaging optical system of the present disclosure includes a first lens group having positive power, a second lens group having negative power, a third lens group having the positive power, and a succeeding lens group including one or more lens groups in order from an object side toward an image side. The third lens group includes a lens having the positive power and a lens having the positive power in order from the object side toward the image side, and includes a lens L3R1 having the positive power, a lens L3R2 having the positive power, and a lens L3R3 having the negative power in order from the image side toward the object side. The lens L3R2 and the lens L3R3 are bonded, the lens L3R1 moves to optically correct image blur, and at least a distance between the second lens group and the third lens group changes during zooming from a wide angle end to a telephoto end.

Imaging optical system, and imaging device and camera system provided with imaging optical system

The zoom lens system includes a first lens group with positive power, a second lens group with negative power, a third lens group with positive power, a fourth lens group with negative power, and a fifth lens group with positive power. An aperture stop is provided between the second and the third lens groups. The third lens group includes lens element Land Lwith positive power, lens element Lwith negative power, and lens element Lwith positive power. The lens elements Land Lare cemented. The lens element Lcorrects image blurring. The fourth lens group moves when focusing. When zooming, the first to the fourth lens group move. Here, condition (1) below is satisfied.0.24&#x3c;33&#x3c;3.0&#x2003;&#x2003;(1)

Growing community of inventors

Osaka, Japan

Takahiro Kitada