# US 10,502,936 B2 · Zoom lens, an optical apparatus, and a manufacturing method of the zoom lens

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- Number: US 10,502,936 B2
- Document ID: US10502936B2
- Status: Granted
- Kind: B2
- Application number: 15/727,359
- Filed: 2017-10-06
- Published: 2018-02-01
- Granted: 2019-12-10
- Earliest claimed: 2013-11-21
- Assignees: Nikon Corporation
- Applicants: Nikon Corporation
- Inventors: Atsushi Suzuki
- Web page: https://patentgrep.com/patent/US10502936B2

## CPC

- G02B 15/145121: {arranged +-+-+}
- G02B 5/005: {Diaphragms (for cameras G03B9/02)}
- G02B 15/173: arranged +-+
- G02B 27/646: {compensating for small deviations, e.g. due to vibration or shake (movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A first lens group (G1) having a positive refractive power, a second lens group (G2) having a negative refractive power, a third lens group (G3) having a positive refractive power, a fourth lens group (G4) having a negative refractive power, and a fifth lens group (G5) having a positive refractive power are arranged in order along an optical axis from an object, and distances between each lens group change when zooming, and the first lens group (G1) is composed of two lenses, and the following expression (1) is satisfied: 0.07<D1/fw<0.46 where D1 denotes a thickness on the optical axis of the first lens group (G1), and fw denotes a focal length of the zoom lens (ZL) in a wide-angle end state.

## Claims

### Claim 1

A zoom lens comprising, in order on an optical axis from an object, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a fifth lens group having a positive refractive power, each distance between adjacent lens groups changing when zooming, and a distance between the third lens group and the fifth lens group changing when zooming,
the first lens group consisting of two lenses, and
the following conditional expression being satisfied:
0.07<D1/fw<0.46
where D1 denotes a thickness on the optical axis of the first lens group, and
fw denotes a focal length of the zoom lens in a wide-angle end state.

### Claim 2 (depends on 1)

A zoom lens according to claim 1, wherein all the lens groups move on the optical axis when zooming.

### Claim 3 (depends on 1)

A zoom lens according to claim 1, wherein a distance on the optical axis from a surface closest to the object in the fifth lens group to an image surface is larger in a telephoto end state than the wide-angle end state.

### Claim 4 (depends on 1)

A zoom lens according to claim 1, wherein the following conditional expression is satisfied:
0.23<(TL5−WL5)/ft<1.20
where WL5 denotes a distance on the optical axis from a surface closest to the object in the fifth lens group to an image surface in the wide-angle end state,
TL5 denotes a distance on the optical axis from the surface closest to the object in the fifth lens group to the image surface in a telephoto end state, and
ft denotes a focal length of the zoom lens in the telephoto end state.

### Claim 5 (depends on 1)

A zoom lens according to claim 1, wherein the first lens group consists of, in order from the object, a negative lens and a positive lens.

### Claim 6 (depends on 1)

A zoom lens according to claim 1, wherein the first lens group is a cemented lens consisting of the two lenses.

### Claim 7 (depends on 1)

A zoom lens according to claim 1, wherein the second lens group consists of, in order from the object, a negative lens, a negative lens, and a positive lens.

### Claim 8 (depends on 1)

A zoom lens according to claim 1, wherein the following conditional expression is satisfied:
0.08<|(W45β−T45β)/(ft/fw)|
where W45β denotes a composite magnification of the fourth lens group and the fifth lens group in the wide-angle end state,
T45β denotes a composite magnification of the fourth lens group and the fifth lens group in the telephoto end state, and
ft denotes a focal length of the zoom lens in the telephoto end state.

### Claim 9 (depends on 1)

An optical apparatus equipped with the zoom lens according to claim 1.

### Claim 10

A manufacturing method of a zoom lens, comprising:
disposing in a lens barrel, in order on an optical axis from an object, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having negative refractive power, and a fifth lens group having positive refractive power, such that each distance between adjacent lens groups changes when zooming,
the first lens group consisting of two lenses, and
the method comprising at least one of the following features (A), (B) and (C):
(A) disposing the third lens group and the fifth lens group such that a distance between the third lens group and the fifth lens group changes when zooming, and satisfying the following conditional expression:
0.07<D1/fw<0.46
where D1 denotes a thickness on the optical axis of the first lens group, and fw denotes a focal length of the zoom lens in a wide-angle end state,
(B) disposing an aperture stop between the second lens group and the third lens group, and satisfying the following conditional expression:
0.07<D1/fw<0.46
where D1 denotes a thickness on the optical axis of the first lens group, and fw denotes a focal length of the zoom lens in wide-angle end state,
(C) satisfying the following conditional expression:
0.07<D1/fw≤0.365
where D1 denotes a thickness on the optical axis of the first lens group, and fw denotes a focal length of the zoom lens in a wide-angle end state.

### Claim 11 (depends on 10)

A manufacturing method of the zoom lens according to claim 10, wherein the lens groups are disposed in the lens barrel so that a distance on the optical axis from a surface closest to the object in the fifth lens group to an image surface is larger in a telephoto end state than the wide-angle end state.

### Claim 12 (depends on 10)

A manufacturing method of the zoom lens according to claim 10, wherein the lens groups are disposed in the lens barrel so that the following conditional expression is satisfied:
0.23<(TL5−WL5)/ft<1.20
WL5 denotes a distance on the optical axis from a surface closest to the object in the fifth lens group to an image surface in the wide-angle end state,
TL5 denotes a distance on the optical axis from the surface closest to the object in the fifth lens group to the image surface in a telephoto end state, and
ft denotes a focal length of the zoom lens in the telephoto end state.

### Claim 13 (depends on 10)

A manufacturing method of the zoom lens according to claim 10, wherein the lens groups are disposed in the lens barrel so that the following conditional expression is satisfied:
0.08<|(W45β−T45β)/(ft/fw)|
where W45β denotes a composite magnification of the fourth lens group and the fifth lens group in the wide-angle end state,
T45β denotes a composite magnification of the fourth lens group and the fifth lens group in a telephoto end state, and
ft denotes a focal length of the zoom lens in the telephoto end state.

### Claim 14

A zoom lens comprising, in order on an optical axis from an object, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a fifth lens group having a positive refractive power, each distance between adjacent lens groups changing when zooming,
an aperture stop being disposed between the second lens group and the third lens group,
the first lens group consisting of two lenses, and
the following conditional expression being satisfied:
0.07<D1/fw<0.46
where D1 denotes a thickness on the optical axis of the first lens group, and
fw denotes a focal length of the zoom lens in a wide-angle end state.

### Claim 15

A zoom lens comprising, in order on an optical axis from an object, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a fifth lens group having a positive refractive power, each distance between adjacent lens groups changing when zooming,
the first lens group consisting of two lenses, and
the following conditional expression being satisfied:
0.07<D1/fw≤0.365
where D1 denotes a thickness on the optical axis of the first lens group, and
fw denotes a focal length of the zoom lens in a wide-angle end state.