Zoom lens and imaging apparatus
AssigneeSony Corporation
InventorYoshito Iwasawa
Life of this patent
Estimating the term…
Abstract
A zoom lens having at least a first lens group including a reflection member for bending an optical axis fixedly during zooming and having a negative refractive power, a second lens group having a negative refractive power, and a third lens group arranged in the order from an object side is provided. In the zoom lens, an image can be shifted into a direction perpendicular to the optical axis by moving either of the second and the third lens groups (“shift lens group”) in a direction perpendicular to the optical axis, and a following conditional expression (1) is satisfied, 0.5<(1−βα)×βb<3.0, (1) where: βα: a magnification of the shift lens group in a maximum telephoto state, and βb: a magnification of a lens group arranged on an image surface side of the shift lens group in the maximum telephoto state.
Claims6
A zoom lens comprising at least a first lens group, a second lens group, and a third lens group arranged in the order from an object side, in which said first lens group includes a reflection member for bending an optical axis fixedly during zooming and has a negative refractive power, and said second lens group has a negative refractive power, wherein:
- an image can be shifted in a direction perpendicular to said optical axis by moving either of said second and said third lens groups (hereinafter referred to as a “shift lens group”) in a direction perpendicular to the optical axis, and
- a following conditional expression (1) is satisfied,
- 0.5<(1−βα)×βb<3.0, (1)
- where:
- βα:
- a magnification of said shift lens group in a maximum telephoto state, and
- βb:
- a magnification of a lens group arranged on an image surface side of said shift lens group in the maximum telephoto state.
An imaging apparatus equipped with a zoom lens and an imaging device which converts an optical image formed by said zoom lens into an electric signal, wherein:
- said zoom lens includes at least a first lens group, a second lens group and a third lens group, arranged in the order from an object, in which said first lens group includes a reflection member for bending an optical axis fixedly during zooming and has a negative refractive power, and said second lens group has a negative refractive power, wherein:
- an image can be shifted in a direction perpendicular to said optical axis by moving either of said second and said third lens groups (hereinafter referred to as a “shift lens group”) in a direction perpendicular to said optical axis, and
- a following conditional expression (1) is satisfied,
- 0.5<(1−βα)×βb<3.0 (1)
- where:
- βα:
- a magnification of said shift lens group in a maximum telephoto state, and
- βb:
- a magnification of a lens group arranged on an image surface side of said shift lens group in the maximum telephoto state.
Dependencies are inferred from the claim text.