Zoom lens and imaging apparatus
AssigneeSony Corporation
InventorMasaharu Hosoi
Life of this patent
Estimating the term…
Abstract
There is provided a zoom lens including a first lens group having negative refractive power, a second lens group having positive refractive power, a third lens group having negative refractive power, and a fourth lens group having positive refractive power, the lens groups being arranged in order from an object side to an image side. The second lens group includes a front group having positive refractive power, and a rear group having positive refractive power, the front and rear groups being arranged in order from the object side to the image side. The front group includes a positive lens, a positive lens, a negative lens, and a positive lens, the lenses being arranged in order from the object side to the image side. The rear group includes at least one positive lens.
Claims10
A zoom lens comprising:
- a first lens group having negative refractive power;
- a second lens group having positive refractive power;
- a third lens group having negative refractive power;
- and
- a fourth lens group having positive refractive power, the lens groups being arranged in order from an object side to an image side,
- wherein the second lens group includes
- a front group having positive refractive power, and
- a rear group having positive refractive power, the front and rear groups being arranged in order from the object side to the image side,
- wherein the front group includes
- a positive lens,
- a positive lens,
- a negative lens, and
- a positive lens, the lenses being arranged in order from the object side to the image side, and
- wherein the rear group includes at least one positive lens, and
- wherein, when magnification is changed between a wide angle end state and a telephoto end state, the first lens group, the second lens group, the third lens group and the fourth lens group are moved in an optical axis direction.
An imaging apparatus comprising:
- a zoom lens;
- and
- an image sensor configured to convert an optical image formed by the zoom lens into an electrical signal,
- wherein the zoom lens include
- a first lens group having negative refractive power,
- a second lens group having positive refractive power,
- a third lens group having negative refractive power, and
- a fourth lens group having positive refractive power, the lens groups being arranged in order from an object side to an image side,
- wherein the second lens group include
- a front group having positive refractive power, and
- a rear group having positive refractive power, the front group and the rear group being arranged in order from the object side to the image side,
- wherein the front group includes
- a positive lens,
- a positive lens,
- a negative lens, and
- a positive lens, the lenses being arranged in order from the object side to the image side, and
- wherein the rear group includes at least one positive lens, and
- wherein, when magnification is changed between a wide angle end state and a telephoto end state, the first lens group, the second lens group, the third lens group and the fourth lens group are moved in an optical axis direction.
Dependencies are inferred from the claim text.