# US 11,994,744 B2 · Optical imaging system

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- Number: US 11,994,744 B2
- Document ID: US11994744B2
- Status: Granted
- Kind: B2
- Application number: 17/007,637
- Filed: 2020-08-31
- Published: 2021-03-04
- Granted: 2024-05-28
- Earliest claimed: 2019-08-30
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Applicants: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Kil Soo Shin; Yong Joo Jo; Il Yong Park; Hyo Jin Hwang
- Web page: https://patentgrep.com/patent/US11994744B2

## CPC

- G02B 9/60: having five components only
- G02B 13/0065: {having a beam-folding prism or mirror}
- G02B 5/04: Prisms
- G02B 7/38: measured at different points on the optical axis {, e.g. focussing on two or more planes and comparing image data}
- G02B 13/0045: {having five or more lenses}
- G02B 13/18: with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)}
- G02B 27/0012: {Optical design, e.g. procedures, algorithms, optimisation routines}
- G03B 30/00: Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
- G02B 3/04: with continuous faces that are rotationally symmetrical but deviate from a true sphere {, e.g. so called "aspheric" lenses}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)

## Abstract

An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially disposed in ascending numerical order along an optical axis from an object-side surface of the first lens toward an imaging plane of the optical imaging system, wherein the conditional expression 11≤TTL/IMG_HT is satisfied, where TTL is a distance along the optical axis from the object-side surface of the first lens to the imaging plane, and IMG_HT is one-half of a diagonal length of the imaging plane.

## Claims

### Claim 1

An optical imaging system comprising:
a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially disposed in ascending numerical order along an optical axis from an object-side surface of the first lens toward an imaging plane of the optical imaging system,
wherein the first to fifth lenses are the only lenses disposed between the object-side surface of the first lens and the imaging plane, and
the following conditional expression is satisfied:
11≤TTL/IMG_HT
where TTL is a distance along the optical axis from the object-side surface of the first lens to the imaging plane, and IMG_HT is one-half of a diagonal length of the imaging plane.

### Claim 2 (depends on 1)

The optical imaging system of claim 1, further comprising a first prism disposed between an object side of the optical imaging system and the object-side surface of the first lens,
wherein the first prism comprises a reflective surface configured to receive incident light from an object and reflect the incident light toward the first lens.

### Claim 3 (depends on 2)

The optical imaging system of claim 2, wherein the following conditional expression is satisfied:
8.0 mm<DPL1<12.0 mm
where DPL1 is a distance in millimeters (mm) along the optical axis from an image-side surface of the first prism to the object-side surface of the first lens.

### Claim 4 (depends on 2)

The optical imaging system of claim 2, wherein the following conditional expression is satisfied:
40 mm<PTTL<70 mm
where PTTL is a distance in millimeters (mm) along the optical axis from the reflective surface of the first prism to the imaging plane.

### Claim 5 (depends on 1)

The optical imaging system of claim 1, wherein the first lens has a positive refractive power.

### Claim 6 (depends on 1)

The optical imaging system of claim 1, wherein the second lens has a negative refractive power.

### Claim 7 (depends on 1)

The optical imaging system of claim 1, wherein the fourth lens has a convex image-side surface.

### Claim 8

An optical imaging system comprising:
a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially disposed in ascending numerical order along an optical axis from an object-side surface of the first lens toward an imaging plane of the optical imaging system,
wherein the first to sixth lenses are the only lenses disposed between the object-side surface of the first lens and the imaging plane and are each constituted by a single lens, and
the following conditional expression is satisfied:
11≤TTL/IMG_HT
where TTL is a distance along the optical axis from the object-side surface of the first lens to the imaging plane, and IMG_HT is one-half of a diagonal length of the imaging plane.

### Claim 9 (depends on 8)

The optical imaging system of claim 8, wherein the sixth lens has a concave object-side surface.

### Claim 10 (depends on 1)

The optical imaging system of claim 1, further comprising a second prism disposed in an optical path between the fifth lens and the imaging plane,
wherein the second reflective member comprises a reflective surface configured to receive light from the fifth lens and reflect the light toward the imaging plane.

### Claim 11 (depends on 1)

The optical imaging system of claim 1, wherein the first lens has a positive refractive power,
the object-side surface of the first lens is convex, and
the fourth lens has a convex image-side surface.

### Claim 12 (depends on 1)

A portable electronic device comprising:
a first camera module comprising the optical imaging system of claim 1, and an image sensor disposed at the imaging plane of the optical imaging system;
a second camera module; and
a third camera module,
wherein the image sensor of the first camera module is configured to convert light incident onto the image sensor through the first to fifth lenses of the optical imaging system of the first camera module into an electrical signal,
the optical axis of the optical imaging system of the first camera module along which the first to fifth lenses are disposed is oriented in a first direction,
an optical axis of the second camera module is oriented in a second direction substantially perpendicular to the first direction, and
an optical axis of the third camera module is oriented in a third direction substantially parallel to the second direction and substantially perpendicular to the first direction.

### Claim 13 (depends on 12)

The portable electronic device of claim 12, wherein the first camera module has a first angle of view and a first focal length,
the second camera module has a second angle of view wider than the first angle of view and a second focal length shorter than the first focal length, and
the third camera module has a third angle of view wider than the second angle of view and a third focal length shorter than the second focal length.

### Claim 14

An optical imaging system comprising:
a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially disposed in ascending numerical order along an optical axis from an object-side surface of the first lens toward an imaging plane of the optical imaging system,
wherein the first to fifth lenses are the only lenses disposed between the object-side surface of the first lens and the imaging plane,
the following conditional expression is satisfied:
11≤TTL/IMG_HT
where TTL is a distance along the optical axis from the object-side surface of the first lens to the imaging plane, and IMG_HT is one-half of a diagonal length of the imaging plane,
the first lens has a non-circular shape when viewed in a direction of the optical axis,
an image-side surface of the first lens has an effective radius that varies from a minimum effective radius that is a short axis effective radius L1S2es in a first direction perpendicular to the optical axis to a maximum effective radius that is a long axis effective radius L1S2el in a second direction perpendicular to the first direction and perpendicular to the optical axis, and
the following conditional expression is satisfied:
0.8<L1S2es/L1S2el<1.0.

### Claim 15 (depends on 14)

The optical imaging system of claim 14, wherein the following conditional expression is satisfied:
0<D12/f≤0.05
where D12 is a distance along the optical axis from the image-side surface of the first lens to an object-side surface of the second lens, and f is a focal length of the optical imaging system.

### Claim 16 (depends on 14)

The optical imaging system of claim 14, wherein the following conditional expression is satisfied:
0.5<L1S2eMax/IMG_HT<2.20
where L1S2eMax is the maximum effective radius of the image-side surface of the first lens and is equal to L1S2el, and IMG_HT is one-half of the diagonal length of the imaging plane.

### Claim 17 (depends on 14)

The optical imaging system of claim 14, further comprising a first prism disposed between an object side of the optical imaging system and the object-side surface of the first lens,
wherein the first prism comprises a reflective surface configured to receive incident light from an object and reflect the incident light toward the first lens.

### Claim 18 (depends on 17)

The optical imaging system of claim 17, wherein the object-side surface of the first lens has an effective radius that varies from a minimum effective radius that is a short axis effective radius L1S1es in the first direction perpendicular to the optical axis to a maximum effective radius that is a long axis effective radius L1S1el in the second direction perpendicular to the first direction and perpendicular to the optical axis, and
the following conditional expression is satisfied:
0.07<L1S1es/PTTL<0.12
where PTTL is a distance along the optical axis from the reflective surface of the first prism to the imaging plane.

### Claim 19 (depends on 14)

The optical imaging system of claim 14, further comprising a second prism disposed in an optical path between the fifth lens and the imaging plane,
wherein the second reflective member comprises a reflective surface configured to receive light from the fifth lens and reflect the light toward the imaging plane.

### Claim 20 (depends on 14)

The optical imaging system of claim 14, wherein the first lens has a positive refractive power,
the object-side surface of the first lens is convex, and
the fourth lens has a convex image-side surface.

### Claim 21 (depends on 14)

A portable electronic device comprising:
a first camera module comprising the optical imaging system of claim 14 and an image sensor disposed at the imaging plane of the optical imaging system;
a second camera module; and
a third camera module,
wherein the image sensor of the first camera module is configured to convert light incident onto the image sensor through the first to fifth lenses of the optical imaging system of the first camera module into an electrical signal,
the optical axis of the optical imaging system of the first camera module along which the first to fifth lenses are disposed is oriented in a first direction,
an optical axis of the second camera module is oriented in a second direction substantially perpendicular to the first direction, and
an optical axis of the third camera module is oriented in a third direction substantially parallel to the second direction and substantially perpendicular to the first direction.

### Claim 22 (depends on 21)

The portable electronic device of claim 21, wherein the first camera module has a first angle of view and a first focal length,
the second camera module has a second angle of view wider than the first angle of view and a second focal length shorter than the first focal length, and
the third camera module has a third angle of view wider than the second angle of view and a third focal length shorter than the second focal length.