Zoom lens and imaging apparatus
AssigneeSony Corporation
InventorHiroki YAMANO
Life of this patent
Estimating the term…
Abstract
A zoom lens includes: a first lens group having positive refracting power; a second lens group having negative refracting power; a third lens group having positive refracting power; a fourth lens group having positive refracting power; and a fifth lens group having positive refracting power arranged in this order from an object side toward an image side, wherein when the zoom lens undergoes zooming operation from a wide-angle end toward a telescopic end, the first lens group moves away from the second lens group toward an object to be imaged, the third lens group approaches the second lens group toward the object, and the fourth lens group approaches the third lens group toward the object, and the zoom lens satisfies the following conditional expression (1) 4.5<100×D(T,2−3)/fW<15. (1)
Claims10
A zoom lens comprising:
- a first lens group having positive refracting power;
- a second lens group having negative refracting power;
- a third lens group having positive refracting power;
- a fourth lens group having positive refracting power;
- and
- a fifth lens group having positive refracting power arranged in this order from an object side toward an image side,
- wherein when the zoom lens undergoes zooming operation from a wide-angle end toward a telescopic end, the first lens group moves away from the second lens group toward an object to be imaged, the third lens group approaches the second lens group toward the object, and the fourth lens group approaches the third lens group toward the object, and
- the zoom lens satisfies the following conditional expression (1)
- 4.5<100×D(T,2−3)/fW<15 (1)
- where D(T, 2−3) represents the distance along an optical axis between the surface in the second lens group that is closest to an image to be formed and the surface in the third lens group that is closest to the object to be imaged in the telescopic-end zoom position, and fW represents the focal length of the entire optical system in the wide-angle-end zoom position.
An imaging apparatus comprising:
- a zoom lens;
- and
- an imaging device that converts an optical image formed by the zoom lens into an electric signal,
- the zoom lens including
- a first lens group having positive refracting power,
- a second lens group having negative refracting power,
- a third lens group having positive refracting power,
- a fourth lens group having positive refracting power, and
- a fifth lens group having positive refracting power arranged in this order from an object side toward an image side,
- wherein when the zoom lens undergoes zooming operation from a wide-angle end toward a telescopic end, the first lens group moves away from the second lens group toward an object to be imaged, the third lens group approaches the second lens group toward the object, and the fourth lens group approaches the third lens group toward the object, and
- the zoom lens satisfies the following conditional expression (1)
- 4.5<100×D(T,2−3)/fW<15 (1)
- where D(T, 2−3) represents the distance along an optical axis between the surface in the second lens group that is closest to an image to be formed and the surface in the third lens group that is closest to the object to be imaged in the telescopic-end zoom position, and fW represents the focal length of the entire optical system in the wide-angle-end zoom position.
Dependencies are inferred from the claim text.