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US 8,842,380 B2Granted
Imaging lens and imaging apparatus
AssigneeSony Corporation
InventorToshihiro Sunaga
Life of this patent
Estimating the term…
Abstract
An imaging lens includes: a first lens group; a second lens group having positive refractive power; and a third lens group having negative refractive power, which are arranged in order from an object side, wherein the first lens group includes a former lens group having a negative lens in a most object side, a diaphragm, and a rear lens group, and wherein, when focusing is performed, the second lens group is moved in the optical axis direction.
Claims10
An imaging lens comprising:
- a first lens group;
- a second lens group having positive refractive power;
- and
- a third lens group having negative refractive power, which are arranged in order from an object side,
- wherein the first lens group includes a former lens group having a negative lens in a most object side, a diaphragm, and a rear lens group,
- wherein, when focusing is performed, the second lens group is moved in the optical axis direction,
- wherein the imaging lens satisfies the following Conditional Equation:
- −2.0<f3/f<−0.8 (1),
- wherein
- f3:
- a focal length of the third lens group, and
- f:
- a focal length of a whole lens system.
10 more elements
An imaging apparatus comprising:
- an imaging lens;
- and
- an imaging device which outputs a photographing signal based on an optical image formed by the imaging lens,
- wherein the imaging lens includes a first lens group, a second lens group having positive refractive power, a third lens group having negative refractive power, which are arranged in order from an object side,
- wherein the first lens group includes a former lens group having a negative lens in a most object side, a diaphragm, and a rear lens group,
- wherein, when focusing is performed, the second lens group is moved in an optical axis direction,
- wherein the imaging lens satisfies the following Conditional Equation:
- −2.0<f3/f<−0.8 (1),
- wherein
- f3:
- a focal length of the third lens group, and
- f:
- a focal length of a whole lens system.
10 more elements
Dependencies are inferred from the claim text.