# US 7,466,911 B2 · Image taking lens

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- Number: US 7,466,911 B2
- Document ID: US7466911B2
- Status: Granted
- Kind: B2
- Application number: 11/449,467
- Filed: 2006-06-08
- Published: 2006-12-28
- Granted: 2008-12-16
- Earliest claimed: 2005-06-23
- Assignees: Konica Minolta Opto, Inc.
- Inventors: Masashi Isono
- Web page: https://patentgrep.com/patent/US7466911B2

## CPC

- G02B 13/0035: {having three lenses}
- G02B 13/18: with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An image taking lens forming an optical image on an solid-state image pickup element according to the present invention, is provided with, in order from an object side thereof: a first lens with a positive power; a second lens with a negative power; and a third lens with a negative power. Third lens includes an image side surface in an aspheric shape such that a region around an optical axis in the aspheric shape is formed in a concave shape facing an image side of the image taking lens and a peripheral region in the aspheric shape surrounding the region around the optical axis is formed in a convex shape facing the image side of the image taking lens. The image taking lens fulfills a predefined conditional formula.

## Claims

### Claim 1

An image taking lens forming an optical image on an solid-state image pickup element, the image taking lens comprising, in order from an object side thereof:
an aperture stop;
a first lens with a positive power;
a second lens with a negative power; and
a third lens with a negative power,
wherein the third lens comprises an image side surface in an aspheric shape such that a region around an optical axis in the aspheric shape is formed in a concave shape facing an image side of the image taking lens and a peripheral region in the aspheric shape surrounding the region around the optical axis is formed in a convex shape facing the image side of the image taking lens, and
the image taking lens fulfills a following conditional formula:
−0.48<f/f3<−0.02,
where f is a focal length of a total system of the image taking lens, and
f3 is a focal length of the third lens.

### Claim 2 (depends on 1)

The image taking lens of claim 1,
wherein the first lens is a glass lens.

### Claim 3 (depends on 1)

The image taking lens of claim 1,
wherein each of the first lens, the second lens and the third lens comprises a homogeneous material.

### Claim 4

An image taking lens forming an optical image on an solid-state image pickup element, the image taking lens comprising, in order from an object side thereof:
a first lens with a positive power;
a second lens with a negative power; and
a third lens with a negative power,
wherein the third lens comprises an image side surface in an aspheric shape such that a region around an optical axis in the aspheric shape is formed in a concave shape facing an image side of the image taking lens and a peripheral region in the aspheric shape surrounding the region around the optical axis is formed in a convex shape facing the image side of the image taking lens, and
the image taking lens fulfills following conditional formulas:
0.01<f2/f3<0.29,
0.1<(r11+r12)/(r11−r12)<1.0,
where f2 is a focal length of the second lens,
f3 is a focal length of the third lens,
r11 is a curvature radius of an object side surface of the first lens and
r12 is a curvature radius of an image side surface of the first lens.

### Claim 5 (depends on 4)

The image taking lens of claim 4, further comprising:
an aperture stop arranged at a closer position to an object side of the image taking lens than a position of the first lens.

### Claim 6 (depends on 4)

The image taking lens of claim 4,
wherein the first lens is a glass lens.

### Claim 7 (depends on 4)

The image taking lens of claim 4,
wherein each of the first lens, the second lens and the third lens comprises a homogeneous material.