# US 11,079,572 B2 · Optical imaging system having prism, fixed lens groups, movable lens groups and correction lens group

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- Number: US 11,079,572 B2
- Document ID: US11079572B2
- Status: Granted
- Kind: B2
- Application number: 16/460,232
- Filed: 2019-07-02
- Published: 2019-10-31
- Granted: 2021-08-03
- Earliest claimed: 2015-10-14
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Applicants: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Hag Chul Kim
- Web page: https://patentgrep.com/patent/US11079572B2

## CPC

- G02B 13/0065: {having a beam-folding prism or mirror}
- A61B 18/042: {using additional gas becoming plasma}
- A61B 18/1402: {Probes for open surgery}
- G02B 13/002: {having at least one aspherical surface}
- G02B 13/006: {at least one element being a compound optical element, e.g. cemented elements}
- G02B 15/144: {having four groups only}
- 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)}
- A61B 2018/00744: {Fluid flow}
- G02B 15/167: having an additional fixed front lens or group of lenses
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

There is provided an optical imaging system including a prism, a first fixed lens group, a first movable lens group, a second movable lens group, and a second fixed lens group. The prism is configured to refract light reflected from an object side toward an imaging plane and a reflecting member. The prism is disposed on the first fixed lens group and the first movable lens group is configured to change a position of the imaging plane so that an overall focal length is changed. The second movable lens group is configured to adjust a position of the imaging plane so that a focal length for an object is adjusted. The imaging plane is disposed on the second fixed lens group.

## Claims

### Claim 1

An optical imaging system, comprising:
a first fixed lens group comprising lenses having different refractive powers;
a prism disposed between the lenses of the first fixed lens group;
a first movable lens group configured to be movable to change an overall focal length;
a correction lens group configured to move in an optical axis direction or a direction intersecting with the optical axis;
a second movable lens group configured to be movable to finely adjust the overall focal length; and
a second fixed lens group,
wherein a distance between the first movable lens group and the correction lens group is longest at a wide angle end and is shortest at a telephoto end,
wherein a distance between the correction lens group and the second movable lens group is longest at the wide angle end and shortest at the telephoto end,
wherein the correction lens group is disposed between the first movable lens group and the second movable lens group, and
wherein the second movable lens group includes two lenses each having positive refractive power.

### Claim 2 (depends on 1)

The optical imaging system of claim 1, wherein a distance between the first fixed lens group and the first movable lens group is shortest at the wide angle end and is longest at the telephoto end.

### Claim 3 (depends on 1)

The optical imaging system of claim 1, wherein a distance between the second movable lens group and the second fixed lens group are shortest at the wide angle end and longest at the telephoto end.

### Claim 4 (depends on 1)

The optical imaging system of claim 1, wherein a distance between the second fixed lens group and the image sensor is constant or substantially constant.

### Claim 5 (depends on 1)

The optical imaging system of claim 1, wherein 4.5<BFL, in which BFL is a distance from an image-side surface of a lens closest to an imaging plane in the second fixed lens group to the imaging plane.

### Claim 6 (depends on 1)

The optical imaging system of claim 1, wherein the correction lens group consists essentially of two lenses.

### Claim 7 (depends on 1)

The optical imaging system of claim 1, wherein the first fixed lens group, the first movable lens group, the correction lens group, the second movable lens group, and the second fixed lens group are disposed in this order from an object side toward an image side of the optical imaging system.

### Claim 8

An optical imaging system, comprising:
a first fixed lens group comprising lenses having different refractive powers;
a prism disposed between the lenses of the first fixed lens group;
a first movable lens group configured to be movable to change an overall focal length;
a correction lens group configured to move in an optical axis direction or a direction intersecting with the optical axis;
a second movable lens group configured to be movable to finely adjust the overall focal length; and
a second fixed lens group,
wherein a distance between the first movable lens group and the correction lens group is longest at a wide angle end and is shortest at a telephoto end,
wherein a distance between the correction lens group and the second movable lens group is longest at the wide angle end and shortest at the telephoto end,
wherein the correction lens group consists essentially of two lenses, and
wherein the second movable lens group includes two lenses each having positive refractive power.

### Claim 9 (depends on 8)

The optical imaging system of claim 8, wherein a distance between the first fixed lens group and the first movable lens group is shortest at the wide angle end and is longest at the telephoto end.

### Claim 10 (depends on 8)

The optical imaging system of claim 8, wherein a distance between the second movable lens group and the second fixed lens group are shortest at the wide angle end and longest at the telephoto end.

### Claim 11 (depends on 8)

The optical imaging system of claim 8, wherein a distance between the second fixed lens group and the image sensor is constant or substantially constant.

### Claim 12 (depends on 8)

The optical imaging system of claim 8, wherein 4.5<BFL, in which BFL is a distance from an image-side surface of a lens closest to an imaging plane in the second fixed lens group to the imaging plane.

### Claim 13 (depends on 8)

The optical imaging system of claim 8, wherein the first fixed lens group, the first movable lens group, the correction lens group, the second movable lens group, and the second fixed lens group are disposed in this order from an object side toward an image side of the optical imaging system.

### Claim 14

An optical imaging system, comprising:
a first fixed lens group comprising lenses having different refractive powers;
a prism disposed between the lenses of the first fixed lens group;
a first movable lens group configured to be movable to change an overall focal length;
a correction lens group configured to move in an optical axis direction or a direction intersecting with the optical axis;
a second movable lens group configure d to be movable to finely adjust the overall focal length; and
a second fixed lens group,
wherein the first fixed lens group, the first movable lens group, the correction lens group, the second movable lens group, and the second fixed lens group are disposed in this order from an object side toward an image side of the optical imaging system,
wherein a distance between the first movable lens group and the correction lens group is longest at a wide angle end and is shortest at a telephoto end,
wherein a distance between the correction lens group and the second movable lens group is longest at the wide angle end and shortest at the telephoto end, and
wherein the second movable lens group includes two lenses each having positive refractive power.

### Claim 15 (depends on 14)

The optical imaging system of claim 14, wherein a distance between the first fixed lens group and the first movable lens group is shortest at the wide angle end and is longest at the telephoto end.

### Claim 16 (depends on 14)

The optical imaging system of claim 14, wherein a distance between the second movable lens group and the second fixed lens group are shortest at the wide angle end and longest at the telephoto end.

### Claim 17 (depends on 14)

The optical imaging system of claim 14, wherein a distance between the second fixed lens group and the image sensor is constant or substantially constant.

### Claim 18 (depends on 14)

The optical imaging system of claim 14, wherein 4.5<BFL, in which BFL is a distance from an image-side surface of a lens closest to an imaging plane in the second fixed lens group to the imaging plane.