# US 2016/0259154 A1 · Zoom lens and photographing apparatus including the same

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- Number: US 2016/0259154 A1
- Document ID: US20160259154A1
- Status: Published application
- Kind: A1
- Application number: 15/060,784
- Filed: 2016-03-04
- Published: 2016-09-08
- Earliest claimed: 2015-03-05
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Min HEU
- Web page: https://patentgrep.com/patent/US20160259154A1

## CPC

- G02B 15/145121: {arranged +-+-+}
- G02B 9/60: having five components only
- G02B 13/002: {having at least one aspherical surface}
- G02B 13/009: {having zoom function}
- G02B 15/173: arranged +-+
- G02B 27/0025: {for optical correction, e.g. distorsion, aberration}
- 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 zoom lens comprising: 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, wherein the first through fifth lens groups are arranged sequentially from an object side to an image side of the zoom lens, wherein the first lens group comprises a doublet lens and a lens having a positive refractive power, wherein the second lens group comprises a first sub-lens group having a negative refractive power and a second sub-lens group having a negative refractive power that is arranged to perform a focusing function; wherein each of the lens groups is arranged to move when the zoom lens is zoomed.

## Claims

### Claim 1

A zoom lens comprising:
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,
wherein the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group are arranged sequentially from an object side to an image side of the zoom lens,
wherein the first lens group comprises a doublet lens and a lens having a positive refractive power,
wherein the second lens group comprises a first sub-lens group having a negative refractive power and a second sub-lens group having a negative refractive power that is arranged to perform a focusing function,
wherein each of the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group is arranged to move when the zoom lens is zoomed, and
wherein the zoom lens satisfies the following condition:
0.4<BFw/FLw<1.1,
where FLw denotes a total focal length of the zoom lens when the zoom lens is in a wide-angle mode and BFw denotes a back focal length of the zoom lens when the zoom lens is in the wide-angle mode.

### Claim 2 (depends on 1)

The zoom lens of claim 1, further comprising an iris diaphragm disposed between the second lens group and the third lens group.

### Claim 3 (depends on 1)

The zoom lens of claim 1, wherein the zoom lens satisfies the following condition:
0.9<FL_RGw/BFw<1.35,
where FL_RGw denotes a combined focal length of the third lens group, the fourth lens group, and the fifth lens group when the zoom lens is in the wide-angle mode.

### Claim 4 (depends on 1)

The zoom lens of claim 1, wherein the zoom lens satisfies the following condition:
0.75
<
FL_Fr
W
FL_RG
W
<
1.25
,
where FL_RGw denotes a combined focal length of the third lens group, the fourth lens group, and the fifth lens group when the zoom lens is in the wide-angle mode and FL_FGw denotes a combined focal length of the first lens group and the second lens group when the zoom lens is in the wide-angle mode.

### Claim 5 (depends on 1)

The zoom lens of claim 1, wherein the third lens group comprises at least one positive lens and a doublet lens.

### Claim 6 (depends on 1)

The zoom lens of claim 1, wherein the fourth lens group comprises at least one negative lens.

### Claim 7 (depends on 1)

The zoom lens of claim 1, wherein the fifth lens group comprises at least one positive lens and a doublet lens.

### Claim 8 (depends on 1)

The zoom lens of claim 1, wherein the fourth lens group performs image stabilization.

### Claim 9 (depends on 1)

The zoom lens of claim 1, wherein the fifth lens group comprises at least one aspherical lens.

### Claim 10 (depends on 9)

The zoom lens of claim 9, wherein the aspherical lens satisfies the following condition:
80<vd3C_ASP,
where vd3C_ASP denotes an Abbe number of the aspherical lens.

### Claim 11 (depends on 1)

The zoom lens of claim 1, wherein the fourth lens group comprises at least one aspherical lens.

### Claim 12 (depends on 1)

The zoom lens of claim 1, wherein when zooming from the wide angle mode to the telephoto mode, the third lens group and the fifth lens group move such that a distance between the third lens group and the fifth lens group does not change.

### Claim 13 (depends on 1)

The zoom lens of claim 1, wherein the first sub-lens group of the second lens group comprises at least one negative lens having a refractive index of 1.73 or more.

### Claim 14 (depends on 1)

The zoom lens of claim 1, wherein the second sub-lens group of the second lens group comprises only one lens.

### Claim 15

A photographic apparatus comprising:
a zoom lens; and
an image sensor receiving an image formed by the zoom lens,
wherein the zoom lens comprises 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,
wherein the first lens group comprises a doublet lens and a lens having a positive refractive power,
wherein the second lens group comprises a first sub-lens group having a negative refractive power and a second sub-lens group having a negative refractive power that is arranged to perform a focusing function,
wherein each of the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group is arranged to move when the zoom lens is zoomed from a wide-angle mode to a telephoto mode, and
wherein the zoom lens satisfies the following condition:
0.4<BFw/FLw<1.1,
where FLw denotes a total focal length of the zoom lens when the zoom lens is in a wide-angle mode and BFw denotes a back focal length of the zoom lens when the zoom lens is in the wide-angle mode.