Zoom lens and image pickup device
AssigneeSony Corporation
InventorsMakoto Kanai, Daisuke Kuroda, Takumi Matsui, Hiroki Yamano
Life of this patent
Estimating the term…
Abstract
Disclosed herein is a zoom lens formed by arranging a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power in order from an object side to an image side, wherein at a time of varying power from a wide-angle end to a telephoto end, the first lens group is moved, and the second lens group is moved to the object side such that an air interval between the first lens group and the second lens group is decreased and such that an air interval between the second lens group and the third lens group is increased.
Claims6
A zoom lens formed by arranging a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power in order from an object side to an image side, wherein
- at a time of varying power from a wide-angle end to a telephoto end, said first lens group is moved, and said second lens group is moved to the object side such that an air interval between said first lens group and said second lens group is decreased and such that an air interval between said second lens group and said third lens group is increased, and
- said first lens group is formed by arranging a first lens as a negative lens having both surfaces formed as aspheric surfaces and having a concave surface facing the image side and a second lens as a positive meniscus lens having both surfaces formed as aspheric surfaces and having a convex surface facing the object side in order from the object side to the image side.
An image pickup device comprising:
- a zoom lens;
- and
- an image pickup element for converting an optical image formed by the zoom lens into an electric signal, wherein
- said zoom lens is formed by arranging a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power in order from an object side to an image side,
- at a time of varying power from a wide-angle end to a telephoto end, said first lens group is moved, and said second lens group is moved to the object side such that an air interval between said first lens group and said second lens group is decreased and such that an air interval between said second lens group and said third lens group is increased, and
- said first lens group is formed by arranging a first lens as a negative lens having both surfaces formed as aspheric surfaces and having a concave surface facing the image side and a second lens as a positive meniscus lens having both surfaces formed as aspheric surfaces and having a convex surface facing the object side in order from the object side to the image side.
Dependencies are inferred from the claim text.