Zoom lens system and imaging device
AssigneePanasonic Intellctual Property Management Co., Ltd.
InventorGenki NAKAZAWA
Life of this patent
Estimating the term…
Abstract
A zoom lens system includes, in order from an object side to an image side: 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; a fifth lens group having positive power; and a sixth lens group having power. During zooming from wide angle extremity to telephoto extremity, the distance between respective lens groups changes. The fifth lens group is composed of at most two lens elements, at least one of which is a concave meniscus lens element having a convex surface facing the object side.
Claims9
A zoom lens system, comprising, in order from an object side to an image side:
- 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;
- a fifth lens group having positive power;
- and
- a sixth lens group having power, wherein
- during zooming from a wide angle extremity to a telephoto extremity, distances between lens groups change,
- the fifth lens group includes at most two lens elements, at least one of which is a convex meniscus lens having a concave surface on the object side, and
- the following condition (4) is satisfied:
- 10.2<fT/fW (4)
- where:
- fT denotes a focal length at the telephoto extremity;
- and
- fW denotes a focal length at the wide angle extremity.
An imaging device configured to output an optical image of an object as an electrical image signal, the imaging device comprising:
- a zoom lens system configured to form the optical image of the object;
- and
- an imaging element configured to convert the optical image formed by the zoom lens system into the electrical image signal, wherein
- the zoom lens system includes, in order from an object side to an image side:
- 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;
- a fifth lens group having positive power;
- and
- a sixth lens group having power, wherein
- during zooming from a wide angle extremity to a telephoto extremity, distances between lens groups change,
- the fifth lens group includes at most two lens elements, at least one of which is a convex meniscus lens element having a concave surface on the object side, and
- the following condition (4) is satisfied:
- 10.2<fT/fW (4)
- where:
- fT denotes a focal length at the telephoto extremity;
- and
- fW denotes a focal length at the wide angle extremity.
Dependencies are inferred from the claim text.