Imaging lens and imaging apparatus
AssigneeFUJIFILM Corporation
InventorTaro Asami
Life of this patent
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Abstract
An imaging lens consists of negative first lens, negative second lens of a biconcave shape, third lens of a plano-convex shape having a convex surface directed toward an object side or of a positive meniscus shape having a convex surface directed toward the object side, and a fourth lens of a plano-convex shape having a convex surface directed toward an image side or of a positive meniscus shape having a convex surface directed toward the image side, which are arranged in this order from the object side. Further, the following conditional formula (11) is satisfied: 3.1<R4/f (11), where R4: a curvature radius of an image-side surface of the second lens, and f: a focal length of an entire system.
Claims16
An imaging lens consisting of:
- a negative first lens;
- a negative second lens of a biconcave shape;
- a third lens of a plano-convex shape having a convex surface directed toward an object side or of a positive meniscus shape having a convex surface directed toward the object side;
- and
- a fourth lens of a plano-convex shape having a convex surface directed toward an image side or of a positive meniscus shape having a convex surface directed toward the image side, which are arranged in this order from the object side,
- wherein the following conditional formula (11) is satisfied:
- 3.1<R4/f (11),
- where
- R4:
- a curvature radius of an image-side surface of the second lens, and
- f:
- a focal length of an entire system.
An imaging lens consisting of:
- a negative first lens;
- a second lens of a negative meniscus shape having a convex surface directed toward an object side;
- a third lens of a plano-convex shape having a convex surface directed toward the object side or of a positive meniscus shape having a convex surface directed toward the object side;
- and
- a fourth lens of a plano-convex shape having a convex surface directed toward an image side or of a positive meniscus shape having a convex surface directed toward the image side, which are arranged in this order from the object side,
- wherein the following conditional formula (11-1) is satisfied:
- R4/f<1.3 (11-1),
- where
- R4:
- a curvature radius of an image-side surface of the second lens, and
- f:
- a focal length of an entire system.
Dependencies are inferred from the claim text.