CN118011593A - Optical imaging system - Google Patents

Abstract

The optical imaging system includes a first lens, a second lens, a third lens, a reflecting member, and an image sensor arranged in order from an object side. The reflecting member includes at least two reflecting surfaces to change a path of light passing through the first lens to the third lens and incident on the reflecting member at least twice.

Description

Optical imaging system

Cross Reference to Related Applications

The present application claims the benefit of priority from korean patent application No. 10-2022-0148695 filed on the korean intellectual property office at 11/9 of 2022 and korean patent application No. 10-2023-0035167 filed on the korean intellectual property office at 3/17 of 2023, the entire disclosures of which are incorporated herein by reference for all purposes.

Technical Field

The following description relates to optical imaging systems.

Background

Various types of camera modules have been mounted in portable terminals, and in particular, demands for folded camera modules to which a tele lens having a long focal length is applied are increasing. Since the tele lens has a long focal length, a sufficient Back Focal Length (BFL) must be ensured. However, for longer BFL, the size of the camera module inevitably increases, which is disadvantageous.

Disclosure of Invention

This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

In one general aspect, an optical imaging system includes a first lens, a second lens, a third lens, a reflective member, and an image sensor arranged in order from an object side. The reflecting member includes at least two reflecting surfaces configured to change a path of light passing through the first lens to the third lens and incident on the reflecting member at least twice.

The reflecting member may be a parallelogram prism.

The first lens and the second lens may each have positive refractive power, and the third lens may have positive refractive power or negative refractive power.

At least one of the first to third lenses may be made of a plastic material.

Any one of the first to third lenses may be made of a plastic material, the other one of the first to third lenses may be made of a glass material, and the remaining one of the first to third lenses may be made of a glass material or a plastic material.

The optical imaging system may satisfy 50< v1<90, where v1 is the abbe number of the first lens.

The optical imaging system may satisfy 1< TTL/f <1.4, where TTL is a distance from an object side surface of the first lens to an imaging surface of the image sensor, and f is a focal length of the optical imaging system.

The optical imaging system may satisfy 0.1< LL/PL <0.4, where LL is a distance from an object side surface of the first lens to an image side surface of the third lens, and PL is a length of a path of light in the reflecting member.

At least one of the object side surface of the first lens and the object side surface of the third lens may be convex.

At least one of the image side surface of the second lens and the image side surface of the third lens may be concave.

In another general aspect, an optical imaging system includes: a plurality of lenses including a first lens, a second lens, and a third lens; an image sensor having an imaging table; and a prism disposed between the plurality of lenses and the image sensor and including a plurality of reflective surfaces, each of the plurality of reflective surfaces configured to reflect light, wherein 0.1< LL/PL <0.4, wherein LL is a distance from an object side of the first lens to an image side of the third lens, and PL is a length of a path of the light in the prism.

The prism may have a parallelogram shape including a first reflective surface and a second reflective surface.

The first lens may have positive refractive power, and an object side surface of the first lens may be convex.

The optical imaging system may satisfy 50< v1<90, where v1 is the abbe number of the first lens.

The optical imaging system may satisfy 0.ltoreq.v1-v2 <56, where v1 is the Abbe number of the first lens and v2 is the Abbe number of the second lens.

The optical imaging system may satisfy 0.02< BFL/f <1.0, where BFL is a distance on the optical axis from the image side of the third lens to the imaging surface of the image sensor, and f is a focal length of the optical imaging system.

Other features and aspects will become apparent from the appended claims, the accompanying drawings, and the following detailed description.

Drawings

Fig. 1 is a diagram showing an optical imaging system according to a first example.

Fig. 2 shows an aberration curve of the optical imaging system shown in fig. 1.

Fig. 3 is a diagram showing an optical imaging system according to a second example.

Fig. 4 shows an aberration curve of the optical imaging system shown in fig. 3.

Fig. 5 is a diagram showing an optical imaging system according to a third example.

Fig. 6 shows an aberration curve of the optical imaging system shown in fig. 5.

Fig. 7 is a diagram showing an optical imaging system according to a fourth example.

Fig. 8 shows an aberration curve of the optical imaging system shown in fig. 7.

Fig. 9 is a diagram showing an optical imaging system according to a fifth example.

Fig. 10 shows an aberration curve of the optical imaging system shown in fig. 9.

Fig. 11 is a diagram showing an optical imaging system according to a sixth example.

Fig. 12 shows an aberration curve of the optical imaging system shown in fig. 11.

Fig. 13 is a diagram showing an optical imaging system according to a seventh example.

Fig. 14 shows an aberration curve of the optical imaging system shown in fig. 13.

Fig. 15 is a diagram showing an optical imaging system according to an eighth example.

Fig. 16 shows an aberration curve of the optical imaging system shown in fig. 15.

Fig. 17 is a diagram showing an optical imaging system according to a ninth example.

Fig. 18 shows an aberration curve of the optical imaging system shown in fig. 17.

Fig. 19 is a view showing an optical imaging system according to a tenth example.

Fig. 20 shows an aberration curve of the optical imaging system shown in fig. 19.

Fig. 21 is a diagram showing an optical imaging system according to an eleventh example.

Fig. 22 shows an aberration curve of the optical imaging system shown in fig. 21.

Fig. 23 is a diagram showing an optical imaging system according to a twelfth example.

Fig. 24 shows an aberration curve of the optical imaging system shown in fig. 23.

Fig. 25 is a view showing an optical imaging system according to a thirteenth example.

Fig. 26 shows an aberration curve of the optical imaging system shown in fig. 25.

Fig. 27 is a diagram showing an optical imaging system according to a fourteenth example.

Fig. 28 shows an aberration curve of the optical imaging system shown in fig. 27.

Like reference numerals refer to like elements throughout the drawings and detailed description. The figures may not be drawn to scale and the relative sizes, proportions, and depictions of elements in the figures may be exaggerated for clarity, illustration, and convenience.

Detailed Description

The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatus, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and/or systems described herein will be apparent to those of ordinary skill in the art. The order of the operations described herein is merely an example and is not limited to the order set forth herein except for operations that must occur in a particular order, but may be altered as would be apparent to one of ordinary skill in the art. In addition, descriptions of functions and structures well known to those of ordinary skill in the art may be omitted for the sake of clarity and conciseness.

The features described herein may be embodied in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein have been provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It should be noted that the use of the phrase "may" (e.g., in connection with what the example or embodiment may include or implement) with respect to the example or embodiment herein means that there is at least one example or embodiment in which such features are included or implemented, and all examples and embodiments are not so limited.

Throughout the specification, when an element such as a layer, region or substrate is described as being "on," connected to, "or" coupled to "another element, the element may be directly on," directly "connected to," or directly "coupled to" the other element, or there may be one or more other elements interposed between the element and the other element. In contrast, when an element is referred to as being "directly on," "directly connected to," or "directly coupled to" another element, there are no other elements intervening elements present.

As used herein, the term "and/or" includes any one of the listed items associated and any combination of any two or more.

Although terms such as "first," "second," and "third" may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first member, first component, first region, first layer, or first portion referred to in these examples may also be referred to as a second member, second component, second region, second layer, or second portion without departing from the teachings of the examples described herein.

Spatially relative terms such as "above … …," "upper," "below … …," and "lower" may be used herein for descriptive convenience to describe one element's relationship to another element as illustrated in the figures. In addition to the orientations depicted in the drawings, these spatially relative terms are intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is turned over, elements described as "on" or "above" relative to another element would then be oriented "under" or "below" the other element. Thus, the expression "above … …" encompasses both orientations of "above" and "below" depending on the spatial orientation of the device. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. The articles "a," "an," and "the" are intended to also include the plural forms unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" specify the presence of stated features, integers, operations, elements, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, operations, elements, and/or groups thereof.

Variations from the shapes of the illustrations as a result, of manufacturing techniques and/or tolerances, are to be expected. Accordingly, examples described herein are not limited to the specific shapes shown in the drawings, but include shape variations that occur during manufacture.

The features of the examples described herein may be combined in various ways that will be apparent after an understanding of the present disclosure. Furthermore, while the examples described herein have a variety of configurations, other configurations are possible that will be apparent upon an understanding of the present disclosure.

In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for convenience of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape shown in the drawings.

An optical imaging system according to various examples disclosed herein may include three lenses arranged along an optical axis. For example, the optical imaging system may include a first lens, a second lens, and a third lens arranged in order from the object side.

In various examples, the first lens refers to the lens closest to the object (or subject), and the third lens refers to the lens closest to the imaging surface (or image sensor).

Further, the first surface of each lens refers to a surface (or object side) near the object side, and the second surface of each lens refers to a surface (or image side) near the image side.

In each example, the radius of curvature and thickness of the lens, TTL (distance from the object side of the first lens to the imaging surface), LL (distance from the object side of the first lens to the image side of the third lens), PL (length of the path of light in the prism), f (focal length), and IMG HT (half of the diagonal length of the imaging surface) are expressed in millimeters (mm).

Further, in the description of each of the lenses of the examples, one surface of the lens is convex means that a paraxial region of the corresponding surface (a very small region in the vicinity of the optical axis) is convex, and one surface of the lens is concave means that a paraxial region of the corresponding surface is concave. Therefore, even in the case where one surface of the lens is described as being convex, the edge portion of the lens may be concave. Also, even in the case where one surface of the lens is described as being concave, the edge portion of the lens may be convex.

An optical imaging system according to various examples may include an optical path changing unit that refracts incident light. For example, the optical path changing unit may be a prism and may be disposed on the image side. For example, a prism may be disposed behind the third lens (or on the image side of the third lens).

Further, the optical imaging system according to various examples may include an image sensor (or an imaging element) for converting an image of an object incident through the optical system into an electrical signal and an infrared cut filter for blocking infrared rays. An infrared cut filter may be disposed between the prism and the image sensor.

Further, the optical imaging system according to various examples may include a diaphragm for adjusting the amount of light. For example, the diaphragm may be disposed on the object side of the first lens or between the second lens and the third lens.

According to various examples, the plurality of lenses may be formed of a material having a refractive index different from that of air. For example, the first to third lenses may be formed of a plastic material or a glass material. Further, optical imaging systems according to various examples may include lenses formed from plastic materials, and may optionally include lenses formed from glass materials.

At least one of the plurality of lenses may have an aspherical surface. For example, at least one of the first to third lenses may have an aspherical surface. Alternatively, at least one of the first surface or the second surface of each of the first to third lenses may be aspherical. The aspherical surface of each of the first to third lenses may be represented by the following equation 1.

Equation 1:

In equation 1, c is the inverse of the radius of curvature of the lens, K is a conic constant, Y is a distance from a certain point on the aspherical surface of the lens to the optical axis, a to H and J are fourth order aspherical constants to twenty order aspherical constants, and Z (or SAG) is a distance from a certain point on the aspherical surface of the lens to the vertex of the aspherical surface of the lens in the optical axis direction.

The first to third lenses included in the optical imaging system according to various examples may have positive refractive power/negative refractive power/positive refractive power or negative refractive power in order from the object side. Further, at least one of the first to third lenses may be formed of a plastic material, and may optionally be formed of a glass material. An optical imaging system according to various examples may include a reflective member having at least two reflective surfaces. For example, the reflecting member may be a prism in the shape of a parallelogram, and the prism may be disposed on the image side of the third lens, in other words, between the third lens and the image sensor (or infrared cut filter).

The optical imaging system according to various examples may satisfy at least one of the following conditional expression 1 to conditional expression 9.

Conditional expression 1:1< TTL/f <1.4

Conditional expression 2:50< v1<90

Conditional expression 3:0.1< LL/PL <0.4

Conditional expression 4:0.2< f1/f <0.8

Conditional expression 5: -20< f2/f < -0.3

Conditional expression 6: -3.5< f3/f <6.2

Conditional expression 7: v1-v2<56 > 0%

Conditional expression 8: PL/f is more than or equal to 0.80 and less than or equal to 0.98

Conditional expression 9: BFL/f < 0.02< 1.0

In the above conditional expression, TTL is a distance from the object side surface of the first lens to the imaging surface, f is a focal length of the optical imaging system, v1 is an abbe number of the first lens, LL is a distance from the object side surface of the first lens to the image side surface of the third lens, PL is a length of a path of light in the prism, and BFL is a distance from the image side surface of the third lens to the imaging surface.

According to various examples, the prism may have a parallelogram shape and include an incident surface on which light is incident, first and second reflection surfaces that change a path of the light, and an exit surface from which the light exits. PL may be the sum of the distance on the optical axis between the incident surface and the first reflective surface, the distance on the optical axis between the first reflective surface and the second reflective surface, and the distance on the optical axis between the second reflective surface and the exit surface. Further, TTL may be a sum of an optical axis distance between an object side surface of the first lens and the first reflective surface, an optical axis distance between the first reflective surface and the second reflective surface, and an optical axis distance between the second reflective surface and the imaging surface, and BFL may be a sum of an optical axis distance between an image side surface of the third lens and the first reflective surface, an optical axis distance between the first reflective surface and the second reflective surface, and an optical axis distance between the second reflective surface and the imaging surface.

Hereinafter, an optical imaging system according to various exemplary examples will be described.

First, an optical imaging system according to a first example will be described with reference to fig. 1 and 2.

The optical imaging system 100 according to the first example may include a first lens 110, a second lens 120, and a third lens 130 arranged in order from the object side.

The first lens 110 may have positive refractive power, and both surfaces thereof may be convex. For example, the first and second surfaces of the first lens 110 may be convex in the paraxial region. The second lens 120 may have a negative refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of the second lens 120 may be convex in the paraxial region and the second surface of the second lens 120 may be concave in the paraxial region. The third lens 130 may have a positive refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of the third lens 130 may be convex in the paraxial region and the second surface of the third lens 130 may be concave in the paraxial region.

The optical imaging system 100 may include a lens formed of a plastic material. For example, all of the first, second and third lenses 110, 120 and 130 may be formed of a plastic material. In addition, the first, second and third lenses 110, 120 and 130 may be formed of plastic materials having different optical characteristics. For example, the abbe numbers of the first lens 110, the second lens 120, and the third lens 130 may be different from one another.

In addition, the optical imaging system 100 may include a diaphragm (not shown), a prism P, an infrared cut filter 140, and an image sensor 150. For example, a diaphragm may be disposed at the object side of the first lens 110. The prism P may be disposed between the third lens 130 and the infrared cut filter 140, and the path of light incident on the prism P may be changed twice in total.

Table 1 below shows the characteristics of the optical imaging system 100, and table 2 shows the values of the aspherical surface of the optical imaging system 100.

TABLE 1

Face numbering	Marking	Radius of curvature	Thickness or spacing of	Refractive index	Abbe number
						0	Object	Infinity of infinity	Infinity of infinity
1		Infinity of infinity	0.000
						2*	First lens	4.847	2.555	1.54	55.7
3*		-62.967	0.254
						4*	Second lens	32.115	0.988	1.62	26.0
5*		4.258	0.216
						6*	Third lens	8.198	0.346	1.68	19.2
7*		13.030	1.000
						8	Prism	Infinity of infinity	2.500	1.519	64.2
9		Infinity of infinity	11.500	1.519	64.2
						10		Infinity of infinity	3.000	1.519	64.2
11		Infinity of infinity	0.500
						12	Optical filter	Infinity of infinity	0.210	1.519	64.2
13		Infinity of infinity	0.091
						14	Imaging surface	Infinity of infinity	0.009

Aspherical surface

TABLE 2

Face numbering

2

3

4

5

6

7

K

0.247

-99.000

45.321

0.285

-2.019

12.657

A

9.E-05

-6.E-03

-2.E-02

-2.E-02

-4.E-03

5.E-03

B

2.E-04

2.E-02

3.E-02

3.E-02

8.E-03

-4.E-03

C

-1.E-04

-1.E-02

-3.E-02

-3.E-02

-1.E-02

2.E-03

D

4.E-05

8.E-03

2.E-02

2.E-02

6.E-03

-6.E-04

E

-7.E-06

-3.E-03

-6.E-03

-8.E-03

-5.E-04

4.E-04

F

7.E-07

5.E-04

1.E-03

1.E-03

-6.E-04

-2.E-04

G

-3.E-08

-6.E-05

-2.E-04

-1.E-04

2.E-04

3.E-05

H

-4.E-10

4.E-06

2.E-05

-3.E-06

-3.E-05

-4.E-06

J

3.E-11

-1.E-07

-5.E-07

7.E-07

2.E-06

2.E-07

Next, an optical imaging system according to a second example will be described with reference to fig. 3 and 4.

The optical imaging system 200 according to the second example may include a first lens 210, a second lens 220, and a third lens 230 arranged in order from the object side.

The first lens 210 may have positive refractive power, and both surfaces thereof may be convex. For example, the first and second surfaces of the first lens 210 may be convex in the paraxial region. The second lens 220 may have a negative refractive power, and both surfaces thereof may be concave. For example, the first and second surfaces of the second lens 220 may be concave in the paraxial region. The third lens 230 may have a negative refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of the third lens 230 may be convex in the paraxial region and the second surface of the third lens 230 may be concave in the paraxial region.

The optical imaging system 200 may include a lens formed of a plastic material. For example, all of the first, second and third lenses 210, 220 and 230 may be formed of a plastic material. Further, according to a second example, at least some of the first lens 210, the second lens 220, and the third lens 230 may be formed of plastic materials having different optical characteristics. For example, the abbe number of the third lens 230 may be different from the abbe numbers of the first lens 210 and the second lens 220.

In addition, the optical imaging system 200 may include a diaphragm (not shown), a prism P, an infrared cut filter 240, and an image sensor 250. For example, a diaphragm may be disposed on the object side of the first lens 210. The prism P may be disposed between the third lens 230 and the infrared cut filter 240, and the path of light incident on the prism P may be changed twice in total.

Table 3 below shows the characteristics of the optical imaging system 200, and table 4 shows the values of the aspherical surface of the optical imaging system 200.

TABLE 3 Table 3

Face numbering	Marking	Radius of curvature	Thickness or spacing of	Refractive index	Abbe number
						0	Object	Infinity of infinity	Infinity of infinity
1		Infinity of infinity	0.000
						2*	First lens	4.011	1.214	1.54	55.7
3*		-12.748	0.100
						4*	Second lens	-10.941	0.925	1.54	55.7
5*		58.696	0.100
						6*	Third lens	8.691	0.609	1.62	26.0
7*		3.678	1.000
						8	Prism	Infinity of infinity	2.500	1.519	64.2
9		Infinity of infinity	11.500	1.519	64.2
						10		Infinity of infinity	3.000	1.519	64.2
11		Infinity of infinity	0.500
						12	Optical filter	Infinity of infinity	0.210	1.519	64.2
13		Infinity of infinity	0.085
						14	Imaging surface	Infinity of infinity	0.015

Aspherical surface

TABLE 4 Table 4

Face numbering

2

3

4

5

6

7

K

0.303

0.000

0.000

-99.000

-12.268

0.507

A

1.E-04

-2.E-06

4.E-06

-5.E-03

-1.E-02

-6.E-03

B

2.E-04

-8.E-06

8.E-06

2.E-02

1.E-02

-6.E-03

C

-9.E-05

-2.E-06

2.E-06

-1.E-02

-7.E-03

2.E-02

D

3.E-05

-4.E-07

4.E-07

8.E-03

-2.E-03

-4.E-02

E

-7.E-06

-4.E-08

2.E-08

-3.E-03

4.E-03

3.E-02

F

5.E-07

-1.E-09

-3.E-09

5.E-04

-2.E-03

-2.E-02

G

-1.E-08

-2.E-10

1.E-09

-6.E-05

6.E-04

4.E-03

H

2.E-08

-3.E-10

2.E-09

3.E-06

-7.E-05

-7.E-04

J

-4.E-09

-2.E-10

7.E-10

1.E-07

3.E-06

4.E-05

An optical imaging system according to a third example will be described with reference to fig. 5 and 6.

The optical imaging system 300 according to the third example may include a first lens 310, a second lens 320, and a third lens 330 arranged in order from the object side.

The first lens 310 may have a positive refractive power, and may have a meniscus shape protruding toward the object side. For example, a first surface of the first lens 310 may be convex in the paraxial region and a second surface of the first lens 310 may be concave in the paraxial region. The second lens 320 may have a negative refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of the second lens 320 may be convex in the paraxial region and the second surface of the second lens 320 may be concave in the paraxial region. The third lens 330 may have a positive refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of the third lens 330 may be convex in the paraxial region and the second surface of the third lens 330 may be concave in the paraxial region.

The optical imaging system 300 may include a lens formed of a plastic material. For example, the first lens 310 and the second lens 320 may be formed of a plastic material, and the third lens 330 may be formed of a glass material. Further, according to a third example, the first lens 310 and the second lens 320 may be formed of plastic materials having different optical characteristics. For example, abbe numbers of the first lens 310 and the second lens 320 may be different from each other.

In addition, the optical imaging system 300 may include a diaphragm (not shown), a prism P, an infrared cut filter 340, and an image sensor 350. For example, a diaphragm may be disposed on the image side of the second lens 320. The prism P may be disposed between the third lens 330 and the infrared cut filter 340, and the path of light incident on the prism P may be changed twice in total.

Table 5 below shows the characteristics of the optical imaging system 300, and table 6 shows the values of the aspherical surface of the optical imaging system 300.

TABLE 5

Aspherical surface

TABLE 6

Face numbering	2	3	4	5	6	7
							K	-0.408	86.522	-0.913	-0.675	0.000	0.000
A	-3.E-04	5.E-05	-4.E-04	-1.E-03	0.000	0.000
							B	1.E-05	-4.E-06	-6.E-05	-1.E-04	0.000	0.000
C	0.000	0.000	0.000	0.000	0.000	0.000
							D	0.000	0.000	0.000	0.000	0.000	0.000
E	0.000	0.000	0.000	0.000	0.000	0.000
							F	0.000	0.000	0.000	0.000	0.000	0.000
G	0.000	0.000	0.000	0.000	0.000	0.000
							H	0.000	0.000	0.000	0.000	0.000	0.000
J	0.000	0.000	0.000	0.000	0.000	0.000

An optical imaging system according to a fourth example will be described with reference to fig. 7 and 8.

The optical imaging system 400 according to the fourth example may include a first lens 410, a second lens 420, and a third lens 430 arranged in order from the object side.

The first lens 410 may have a positive refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of the first lens 410 may be convex in the paraxial region and the second surface of the first lens 410 may be concave in the paraxial region. The second lens 420 may have a negative refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of the second lens 420 may be convex in the paraxial region and the second surface of the second lens 420 may be concave in the paraxial region. The third lens 430 may have a positive refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of third lens 430 may be convex in the paraxial region and the second surface of third lens 430 may be concave in the paraxial region.

The optical imaging system 400 may include a lens formed of a plastic material. For example, the first lens 410 may be formed of a glass material, and the second lens 420 and the third lens 430 may be formed of a plastic material. Further, according to the fourth example, the second lens 420 and the third lens 430 may be formed of plastic materials having different optical characteristics. For example, abbe numbers of the second lens 420 and the third lens 430 may be different from each other.

In addition, the optical imaging system 400 may include a diaphragm (not shown), a prism P, an infrared cut filter 440, and an image sensor 450. For example, a diaphragm may be disposed at the object side of the first lens 410. The prism P may be disposed between the third lens 430 and the infrared cut filter 440, and the path of light incident on the prism P may be changed twice in total.

Table 7 below shows the characteristics of the optical imaging system 400, and table 8 shows the values of the aspherical surface of the optical imaging system 400.

TABLE 7

Face numbering	Marking	Radius of curvature	Thickness or spacing of	Refractive index	Abbe number
						0	Object	Infinity of infinity	Infinity of infinity
1		Infinity of infinity	0.000
						2	First lens	5.513	2.000	1.498	81.6
3		58.302	0.500
						4*	Second lens	16.160	0.737	1.620	25.9
5*		6.717	0.173
						6*	Third lens	8.479	1.562	1.677	19.2
7*		8.849	1.000
						8	Prism	Infinity of infinity	2.500	1.519	64.2
9		Infinity of infinity	11.500	1.519	64.2
						10		Infinity of infinity	3.000	1.519	64.2
11		Infinity of infinity	0.500
						12	Optical filter	Infinity of infinity	0.210	1.519	64.2
13		Infinity of infinity	0.100
						14	Imaging surface	Infinity of infinity	0.000

Aspherical surface

TABLE 8

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An optical imaging system according to a fifth example will be described with reference to fig. 9 and 10.

The optical imaging system 500 according to the fifth example may include a first lens 510, a second lens 520, and a third lens 530 arranged in order from the object side.

The first lens 510 may have positive refractive power, and both surfaces thereof may be convex. For example, the first and second surfaces of the first lens 510 may be convex in the paraxial region. The second lens 520 may have a negative refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of the second lens 520 may be convex in the paraxial region and the second surface of the second lens 520 may be concave in the paraxial region. The third lens 530 may have a negative refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of the third lens 530 may be convex in the paraxial region and the second surface of the third lens 530 may be concave in the paraxial region.

The optical imaging system 500 may include a lens formed of a plastic material. For example, the first lens 510 and the second lens 520 may be formed of a glass material, and the third lens 530 may be formed of a plastic material.

In addition, the optical imaging system 500 may include a diaphragm (not shown), a prism P, an infrared cut filter 540, and an image sensor 550. For example, a diaphragm may be disposed on the object side of the first lens 510. The prism P may be disposed between the third lens 530 and the infrared cut filter 540, and the path of light incident on the prism P may be changed twice in total.

Table 9 below shows the characteristics of the optical imaging system 500, and table 10 shows the values of the aspherical surface of the optical imaging system 500.

TABLE 9

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Aspherical surface

Table 10

Face numbering	2	3	4	5	6	7
							K	0.000	0.000	0.000	0.000	-3.928	0.849
A	0.000	0.000	0.000	0.000	-6.E-04	-1.E-03
							B	0.000	0.000	0.000	0.000	-6.E-05	-5.E-05
C	0.000	0.000	0.000	0.000	0.000	0.000
							D	0.000	0.000	0.000	0.000	0.000	0.000
E	0.000	0.000	0.000	0.000	0.000	0.000
							F	0.000	0.000	0.000	0.000	0.000	0.000
G	0.000	0.000	0.000	0.000	0.000	0.000
							H	0.000	0.000	0.000	0.000	0.000	0.000
J	0.000	0.000	0.000	0.000	0.000	0.000

Next, an optical imaging system according to a sixth example will be described with reference to fig. 11 and 12.

The optical imaging system 600 according to the sixth example may include a first lens 610, a second lens 620, and a third lens 630 arranged in order from the object side.

The first lens 610 may have positive refractive power, and both surfaces thereof may be convex. For example, the first and second surfaces of the first lens 610 may be convex in the paraxial region. The second lens 620 may have a negative refractive power, and may have a meniscus shape protruding toward the image side. For example, the first surface of the second lens 620 may be concave in the paraxial region and the second surface of the second lens 620 may be convex in the paraxial region. The third lens 630 may have a negative refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of the third lens 630 may be convex in the paraxial region and the second surface of the third lens 630 may be concave in the paraxial region.

The optical imaging system 600 may include a lens formed of a plastic material. For example, the first lens 610 may be formed of a plastic material, and the second and third lenses 620 and 630 may be formed of a glass material.

In addition, the optical imaging system 600 may include a diaphragm (not shown), a prism P, an infrared cut filter 640, and an image sensor 650. For example, a diaphragm may be disposed at the object side of the first lens 610. The prism P may be disposed between the third lens 630 and the infrared cut filter 640, and the path of light incident on the prism P may be changed twice in total.

Table 11 below shows the characteristics of the optical imaging system 600, and table 12 shows the values of the aspherical surface of the optical imaging system 600.

TABLE 11

Face numbering	Marking	Radius of curvature	Thickness or spacing of	Refractive index	Abbe number
						0	Object	Infinity of infinity	Infinity of infinity
1		Infinity of infinity	0.000
						2*	First lens	5.243	1.319	1.537	55.7
3*		-7.598	0.102
						4	Second lens	-7.613	1.000	1.630	35.7
5		-20.207	0.100
						6	Third lens	11.774	1.456	1.630	35.7
7		3.877	1.000
						8	Prism	Infinity of infinity	2.500	1.519	64.2
9		Infinity of infinity	11.500	1.519	64.2
						10		Infinity of infinity	3.000	1.519	64.2
11		Infinity of infinity	0.500
						12	Optical filter	Infinity of infinity	0.210	1.519	64.2
13		Infinity of infinity	0.097
						14	Imaging surface	Infinity of infinity	0.003

Aspherical surface

Table 12

Next, an optical imaging system according to a seventh example will be described with reference to fig. 13 and 14.

The optical imaging system 700 according to the seventh example may include a first lens 710, a second lens 720, and a third lens 730 arranged in order from the object side.

The first lens 710 may have positive refractive power, and both surfaces thereof may be convex. For example, the first and second surfaces of the first lens 710 may be convex in the paraxial region. The second lens 720 may have a negative refractive power, and may have a meniscus shape protruding toward the image side. For example, the first surface of the second lens 720 may be concave in the paraxial region and the second surface of the second lens 720 may be convex in the paraxial region. The third lens 730 may have a negative refractive power, and both surfaces thereof may be concave. For example, the first and second surfaces of the third lens 730 may be concave in the paraxial region.

The optical imaging system 700 may include a lens formed of a plastic material. For example, all of the first, second and third lenses 710, 720 and 730 may be formed of a plastic material. Further, according to a seventh example, at least some of the first, second, and third lenses 710, 720, and 730 may be formed of plastic materials having different optical characteristics. For example, the abbe number of the first lens 710 may be different from the abbe numbers of the second lens 720 and the third lens 730.

In addition, the optical imaging system 700 may include a diaphragm (not shown), a prism P, an infrared cut filter 740, and an image sensor 750. For example, a diaphragm may be disposed at the object side of the first lens 710. The prism P may be disposed between the third lens 730 and the infrared cut filter 740, and the path of light incident on the prism P may be changed twice in total.

Table 13 below shows the characteristics of the optical imaging system 700, and table 14 shows the values of the aspherical surface of the optical imaging system 700.

TABLE 13

Face numbering	Marking	Radius of curvature	Thickness or spacing of	Refractive index	Abbe number
						0	Object	Infinity of infinity	Infinity of infinity
1		Infinity of infinity	0.000
						2*	First lens	5.066	0.200	1.537	55.7
3*		-6.667	0.100
						4*	Second lens	-8.208	0.663	1.571	37.4
5*		-30.077	0.263
						6*	Third lens	-9.136	1.491	1.571	37.4
7*		12.243	1.000
						8	Prism	Infinity of infinity	2.500	1.519	64.2
9		Infinity of infinity	11.500	1.519	64.2
						10		Infinity of infinity	3.000	1.519	64.2
11		Infinity of infinity	0.500
						12	Optical filter	Infinity of infinity	0.210	1.519	64.2
13		Infinity of infinity	0.096
						14	Imaging surface	Infinity of infinity	0.004

Aspherical surface

TABLE 14

Face numbering	2	3	4	5	6	7
							K	-0.239	0.749	4.251	58.723	-13.033	6.220
A	3.E-04	2.E-03	-3.E-04	-4.E-04	4.E-03	5.E-03
							B	1.E-05	8.E-05	4.E-04	4.E-04	-4.E-05	-8.E-05
C	0.000	0.000	0.000	0.000	0.000	0.000
							D	0.000	0.000	0.000	0.000	0.000	0.000
E	0.000	0.000	0.000	0.000	0.000	0.000
							F	0.000	0.000	0.000	0.000	0.000	0.000
G	0.000	0.000	0.000	0.000	0.000	0.000
							H	0.000	0.000	0.000	0.000	0.000	0.000
J	0.000	0.000	0.000	0.000	0.000	0.000

An optical imaging system according to an eighth example will be described with reference to fig. 15 and 16.

The optical imaging system 800 according to the eighth example may include a first lens 810, a second lens 820, and a third lens 830 arranged in order from the object side.

The first lens 810 may have positive refractive power, and both surfaces thereof may be convex. For example, the first and second surfaces of the first lens 810 may be convex in the paraxial region. The second lens 820 may have a negative refractive power, and both surfaces thereof may be concave. For example, the first and second surfaces of the second lens 820 may be concave in the paraxial region. The third lens 830 may have a negative refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of the third lens 830 may be convex in the paraxial region and the second surface of the third lens 830 may be concave in the paraxial region.

The optical imaging system 800 may include a lens formed of a plastic material. For example, all of the first, second and third lenses 810, 820, 830 may be formed of a plastic material. Further, according to an eighth example, at least some of the first lens 810, the second lens 820, and the third lens 830 may be formed of plastic materials having different optical characteristics. For example, the abbe number of the third lens 830 may be different from the abbe numbers of the first lens 810 and the second lens 820.

In addition, the optical imaging system 800 may include a diaphragm (not shown), a prism P, an infrared cut filter 840, and an image sensor 850. For example, a diaphragm may be disposed at the object side of the third lens 830. The prism P may be disposed between the third lens 830 and the infrared cut filter 840, and the path of light incident on the prism P may be changed twice in total.

Table 15 below shows the characteristics of the optical imaging system 800, and table 16 shows the values of the aspherical surface of the optical imaging system 800.

TABLE 15

Face numbering	Marking	Radius of curvature	Thickness or spacing of	Refractive index	Abbe number
						0	Object	Infinity of infinity	Infinity of infinity
1		Infinity of infinity	0.000
						2*	First lens	5.921	0.200	1.537	55.7
3*		-15.418	0.100
						4*	Second lens	-1248.125	1.367	1.537	55.7
5*		16.994	0.163
						6*	Third lens	67.177	1.500	1.646	23.5
7*		7.765	1.000
						8	Prism	Infinity of infinity	2.500	1.519	64.2
9		Infinity of infinity	11.500	1.519	64.2
						10		Infinity of infinity	3.000	1.519	64.2
11		Infinity of infinity	0.500
						12	Optical filter	Infinity of infinity	0.210	1.519	64.2
13		Infinity of infinity	0.196
						14	Imaging surface	Infinity of infinity	0.004

Aspherical surface

Table 16

Face numbering	2	3	4	5	6	7
							K	-0.128	7.933	-99.000	10.022	99.000	-0.580
A	1.E-04	2.E-03	8.E-05	-3.E-03	1.E-03	4.E-03
							B	8.E-06	7.E-05	3.E-04	4.E-04	-9.E-05	-2.E-04
C	0.000	0.000	0.000	0.000	0.000	0.000
							D	0.000	0.000	0.000	0.000	0.000	0.000
E	0.000	0.000	0.000	0.000	0.000	0.000
							F	0.000	0.000	0.000	0.000	0.000	0.000
G	0.000	0.000	0.000	0.000	0.000	0.000
							H	0.000	0.000	0.000	0.000	0.000	0.000
J	0.000	0.000	0.000	0.000	0.000	0.000

An optical imaging system according to a ninth example will be described with reference to fig. 17 and 18.

The optical imaging system 900 according to the ninth example may include a first lens 910, a second lens 920, and a third lens 930 arranged in order from the object side.

The first lens 910 may have positive refractive power, and both surfaces thereof may be convex. For example, the first and second surfaces of the first lens 910 may be convex in the paraxial region. The second lens 920 may have a negative refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of the second lens 920 may be convex in the paraxial region and the second surface of the second lens 920 may be concave in the paraxial region. The third lens 930 may have a negative refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of the third lens 930 may be convex in the paraxial region and the second surface of the third lens 930 may be concave in the paraxial region.

The optical imaging system 900 may include a lens formed of a plastic material. For example, the first lens 910 may be formed of a glass material, and the second lens 920 and the third lens 930 may be formed of a plastic material. Further, according to the ninth example, the second lens 920 and the third lens 930 may be formed of plastic materials having different optical characteristics. For example, abbe numbers of the second lens 920 and the third lens 930 may be different from each other.

In addition, the optical imaging system 900 may include a diaphragm (not shown), a prism P, an infrared cut filter 940, and an image sensor 950. For example, a stop may be disposed on the image side of the second lens 920. The prism P may be disposed between the third lens 930 and the infrared cut filter 940, and the path of light incident on the prism P may be changed twice in total.

Table 17 below shows the characteristics of the optical imaging system 900, and table 18 shows the values of the aspherical surface of the optical imaging system 900.

TABLE 17

Face numbering	Marking	Radius of curvature	Thickness or spacing of	Refractive index	Abbe number
						0	Object	Infinity of infinity	Infinity of infinity
1		Infinity of infinity	0.000
						2	First lens	5.238	1.794	1.498	81.6
3		-76.751	0.100
						4*	Second lens	18.184	1.016	1.571	37.4
5*		5.789	0.250
						6*	Third lens	5.348	1.500	1.668	20.4
7*		4.230	1.000
						8	Prism	Infinity of infinity	2.500	1.519	64.2
9		Infinity of infinity	11.500	1.519	64.2
						10		Infinity of infinity	3.000	1.519	64.2
11		Infinity of infinity	0.500
						12	Optical filter	Infinity of infinity	0.210	1.519	64.2
13		Infinity of infinity	0.096
						14	Imaging surface	Infinity of infinity	0.004

Aspherical surface

TABLE 18

Face numbering	2	3	4	5	6	7
							K	0.000	0.000	-1.871	1.283	-0.265	-1.417
A	0.000	0.000	1.E-03	2.E-03	-2.E-04	8.E-04
							B	0.000	0.000	-6.E-05	2.E-05	2.E-05	-3.E-05
C	0.000	0.000	0.000	0.000	0.000	0.000
							D	0.000	0.000	0.000	0.000	0.000	0.000
E	0.000	0.000	0.000	0.000	0.000	0.000
							F	0.000	0.000	0.000	0.000	0.000	0.000
G	0.000	0.000	0.000	0.000	0.000	0.000
							H	0.000	0.000	0.000	0.000	0.000	0.000
J	0.000	0.000	0.000	0.000	0.000	0.000

An optical imaging system according to a tenth example will be described with reference to fig. 19 and 20.

The optical imaging system 1000 according to the tenth example may include a first lens 1010, a second lens 1020, and a third lens 1030 arranged in order from the object side.

The first lens 1010 may have positive refractive power, and both surfaces thereof may be convex. For example, the first and second surfaces of the first lens 1010 may be convex in the paraxial region. The second lens 1020 may have a negative refractive power, and both surfaces thereof may be concave. For example, the first and second surfaces of the second lens 1020 may be concave in the paraxial region. The third lens 1030 may have a positive refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of the third lens 1030 may be convex in the paraxial region and the second surface of the third lens 1030 may be concave in the paraxial region.

The optical imaging system 1000 may include a lens formed of a plastic material. For example, the first lens 1010 and the second lens 1020 may be formed of a plastic material, and the third lens 1030 may be formed of a glass material. Further, according to a tenth example, the first lens 1010 and the second lens 1020 may be formed of plastic materials having different optical characteristics. For example, the abbe numbers of the first lens 1010 and the second lens 1020 may be different from each other.

In addition, the optical imaging system 1000 may include a diaphragm (not shown), a prism P, an infrared cut filter 1040, and an image sensor 1050. For example, a stop may be provided on the object side of the first lens 1010. The prism P may be disposed between the third lens 1030 and the infrared cut filter 1040, and the path of light incident on the prism P may be changed twice in total.

Table 19 below shows the characteristics of the optical imaging system 1000, and table 20 shows the values of the aspherical surface of the optical imaging system 1000.

TABLE 19

Aspherical surface

Table 20

Face numbering	2	3	4	5	6	7
							K	0.330	-8.070	-33.071	2.896	0.000	0.000
A	-1.E-04	2.E-03	3.E-03	4.E-03	0.000	0.000
							B	-4.E-05	-6.E-05	-2.E-04	-2.E-04	0.000	0.000
C	0.000	0.000	0.000	0.000	0.000	0.000
							D	0.000	0.000	0.000	0.000	0.000	0.000
E	0.000	0.000	0.000	0.000	0.000	0.000
							F	0.000	0.000	0.000	0.000	0.000	0.000
G	0.000	0.000	0.000	0.000	0.000	0.000
							H	0.000	0.000	0.000	0.000	0.000	0.000
J	0.000	0.000	0.000	0.000	0.000	0.000

Next, an optical imaging system according to an eleventh example will be described with reference to fig. 21 and 22.

The optical imaging system 1100 according to the eleventh example may include a first lens 1110, a second lens 1120, and a third lens 1130 arranged in order from the object side.

The first lens 1110 may have positive refractive power, and both surfaces thereof may be convex. For example, the first and second surfaces of the first lens 1110 may be convex in the paraxial region. The second lens 1120 may have a negative refractive power, and may have a meniscus shape protruding toward the image side. For example, the first surface of the second lens 1120 may be concave in the paraxial region and the second surface of the second lens 1120 may be convex in the paraxial region. The third lens 1130 may have a negative refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of the third lens 1130 may be convex in the paraxial region and the second surface of the third lens 1130 may be concave in the paraxial region.

The optical imaging system 1100 may include a lens formed of a plastic material. For example, the first lens 1110 may be formed of a glass material, and the second lens 1120 and the third lens 1130 may be formed of a plastic material. Further, according to an eleventh example, the second lens 1120 and the third lens 1130 may be formed of plastic materials having different optical characteristics. For example, abbe numbers of the second lens 1120 and the third lens 1130 may be different from each other.

In addition, the optical imaging system 1100 may include a diaphragm (not shown), a prism P, an infrared cut filter 1140, and an image sensor 1150. For example, a diaphragm may be disposed on the object side of the first lens 1110. The prism P may be disposed between the third lens 1130 and the infrared cut filter 1140, and the path of light incident on the prism P may be changed twice in total.

Table 21 below shows the characteristics of the optical imaging system 1100, and table 22 shows the values of the aspherical surface of the optical imaging system 1100.

Table 21

Face numbering	Marking	Radius of curvature	Thickness or spacing of	Refractive index	Abbe number
						0	Object	Infinity of infinity	Infinity of infinity
1		Infinity of infinity	0.000
						2	First lens	5.414	1.924	1.498	81.6
3		-22.598	0.300
						4	Second lens	-8.908	0.400	1.537	55.7
5		-9.567	0.300
						6*	Third lens	7.220	1.107	1.571	37.4
7*		3.298	1.000
						8	Prism	Infinity of infinity	2.500	1.519	64.2
9		Infinity of infinity	11.500	1.519	64.2
						10		Infinity of infinity	3.000	1.519	64.2
11		Infinity of infinity	0.500
						12	Optical filter	Infinity of infinity	0.210	1.519	64.2
13		Infinity of infinity	0.097
						14	Imaging surface	Infinity of infinity	0.003

Aspherical surface

Table 22

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Next, an optical imaging system according to a twelfth example will be described with reference to fig. 23 and 24.

The optical imaging system 1200 according to the twelfth example may include a first lens 1210, a second lens 1220, and a third lens 1230, which are arranged in order from the object side.

The first lens 1210 may have positive refractive power, and both surfaces thereof may be convex. For example, the first and second surfaces of the first lens 1210 may be convex in the paraxial region. The second lens 1220 may have a negative refractive power, and both surfaces thereof may be concave. For example, the first and second surfaces of the second lens 1220 may be concave in the paraxial region. The third lens 1230 may have a negative refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of the third lens 1230 may be convex in the paraxial region and the second surface of the third lens 1230 may be concave in the paraxial region.

The optical imaging system 1200 may include a lens formed of a plastic material. For example, the first lens 1210 may be formed of a glass material, and the second lens 1220 and the third lens 1230 may be formed of a plastic material. Further, according to a twelfth example, the second lens 1220 and the third lens 1230 may be formed of plastic materials having different optical characteristics. For example, abbe numbers of the second lens 1220 and the third lens 1230 may be different from each other.

In addition, the optical imaging system 1200 may include a diaphragm (not shown), a prism P, an infrared cut filter 1240, and an image sensor 1250. For example, a stop may be disposed on the object side of the first lens 1210. The prism P may be disposed between the third lens 1230 and the infrared cut filter 1240, and the path of light incident on the prism P may be changed twice in total.

Table 23 below shows the characteristics of the optical imaging system 1200, and table 24 shows the values of the aspherical surface of the optical imaging system 1200.

Table 23

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Aspherical surface

Table 24

Face numbering	2	3	4	5	6	7
							K	0.000	0.000	88.493	-10.109	-4.311	-1.187
A	0.000	0.000	-2.E-04	2.E-03	-5.E-04	-3.E-03
							B	0.000	0.000	-6.E-05	-2.E-04	-1.E-04	2.E-04
C	0.000	0.000	0.000	0.000	0.000	0.000
							D	0.000	0.000	0.000	0.000	0.000	0.000
E	0.000	0.000	0.000	0.000	0.000	0.000
							F	0.000	0.000	0.000	0.000	0.000	0.000
G	0.000	0.000	0.000	0.000	0.000	0.000
							H	0.000	0.000	0.000	0.000	0.000	0.000
J	0.000	0.000	0.000	0.000	0.000	0.000

An optical imaging system according to a thirteenth example will be described with reference to fig. 25 and 26.

The optical imaging system 1300 according to the thirteenth example may include a first lens 1310, a second lens 1320, and a third lens 1330 arranged in order from the object side.

The first lens 1310 may have positive refractive power, and both surfaces thereof may be convex. For example, the first and second surfaces of the first lens 1310 may be convex in the paraxial region. The second lens 1320 may have a negative refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of the second lens 1320 may be convex in the paraxial region and the second surface of the second lens 1320 may be concave in the paraxial region. The third lens 1330 may have a negative refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of the third lens 1330 may be convex in the paraxial region and the second surface of the third lens 1330 may be concave in the paraxial region.

The optical imaging system 1300 may include a lens formed of a plastic material. For example, all of the first, second and third lenses 1310, 1320 and 1330 may be formed of a plastic material. Further, according to a thirteenth example, at least some of the first, second, and third lenses 1310, 1320, 1330 may be formed of plastic materials having different optical characteristics. For example, the abbe number of the third lens 1330 may be different from the abbe numbers of the first and second lenses 1310 and 1320.

In addition, the optical imaging system 1300 may include a diaphragm (not shown), a prism P, an infrared cut filter 1340, and an image sensor 1350. For example, the aperture may be disposed on the object side of the first lens 1310. The prism P may be disposed between the third lens 1330 and the infrared cut filter 1340, and the path of light incident on the prism P may be changed twice in total.

Table 25 below shows the characteristics of the optical imaging system 1300, and table 26 shows the values of the aspherical surface of the optical imaging system 1300.

Table 25

Face numbering	Marking	Radius of curvature	Thickness or spacing of	Refractive index	Abbe number
						0	Object	Infinity of infinity	Infinity of infinity
1		Infinity of infinity	0.000
						2*	First lens	6.770	1.898	1.537	55.7
3*		-14.433	0.100
						4*	Second lens	78.050	1.327	1.537	55.7
5*		15.204	0.117
						6*	Third lens	28.675	1.500	1.646	23.5
7*		7.169	1.000
						8	Prism	Infinity of infinity	2.500	1.519	64.2
9		Infinity of infinity	13.000	1.519	64.2
						10		Infinity of infinity	3.500	1.519	64.2
11		Infinity of infinity	0.500
						12	Optical filter	Infinity of infinity	0.210	1.519	64.2
13		Infinity of infinity	0.095
						14	Imaging surface	Infinity of infinity	0.005

Aspherical surface

Table 26

Face numbering	2	3	4	5	6	7
							K	-0.395	5.972	99.000	9.742	71.736	-0.686
A	-5.E-05	2.E-03	1.E-04	-3.E-03	1.E-03	4.E-03
							B	4.E-07	5.E-05	3.E-04	3.E-04	-1.E-03	-2.E-04
C	0.000	0.000	0.000	0.000	0.000	0.000
							D	0.000	0.000	0.000	0.000	0.000	0.000
E	0.000	0.000	0.000	0.000	0.000	0.000
							F	0.000	0.000	0.000	0.000	0.000	0.000
G	0.000	0.000	0.000	0.000	0.000	0.000
							H	0.000	0.000	0.000	0.000	0.000	0.000
J	0.000	0.000	0.000	0.000	0.000	0.000

An optical imaging system according to a fourteenth example will be described with reference to fig. 27 and 28.

The optical imaging system 1400 according to the fourteenth example may include a first lens 1410, a second lens 1420, and a third lens 1430 arranged in order from the object side.

The first lens 1410 may have a positive refractive power, and may have a meniscus shape protruding toward the object side. For example, a first surface of the first lens 1410 may be convex in the paraxial region and a second surface of the first lens 1410 may be concave in the paraxial region. The second lens 1420 may have a negative refractive power, and may have a meniscus shape protruding toward the object side. For example, the first surface of the second lens 1420 may be convex in the paraxial region and the second surface of the second lens 1420 may be concave in the paraxial region. The third lens 1430 may have positive refractive power and may have a meniscus shape protruding toward the object side. For example, the first surface of the third lens 1430 may be convex in the paraxial region and the second surface of the third lens 1430 may be concave in the paraxial region.

The optical imaging system 1400 may include a lens formed of a plastic material. For example, the first lens 1410 may be formed of a glass material, and the second lens 1420 and the third lens 1430 may be formed of a plastic material. Further, according to a fourteenth example, the second lens 1420 and the third lens 1430 may be formed of plastic materials having different optical characteristics. For example, abbe numbers of the second lens 1420 and the third lens 1430 may be different from each other.

In addition, the optical imaging system 1400 may include a diaphragm (not shown), a prism P, an infrared cut filter 1440, and an image sensor 1450. For example, a diaphragm may be disposed on the image side of the second lens 1420. The prism P may be disposed between the third lens 1430 and the infrared cut filter 1440, and the path of light incident on the prism P may be changed twice in total.

Table 27 below shows the characteristics of the optical imaging system 1400 and table 28 shows the values of the aspherical surface of the optical imaging system 1400.

Table 27

Face numbering	Marking	Radius of curvature	Thickness or spacing of	Refractive index	Abbe number
						0	Object	Infinity of infinity	Infinity of infinity
1		Infinity of infinity	0.000
						2*	First lens	5.040	2.436	1.585	59.5
3*		66.923	0.500
						4*	Second lens	23.956	0.675	1.621	26.0
5*		4.169	0.500
						6*	Third lens	6.635	0.500	1.679	19.2
7*		10.301	0.100
						8	Prism	Infinity of infinity	2.500	1.519	64.2
9		Infinity of infinity	13.000	1.519	64.2
						10		Infinity of infinity	3.500	1.519	64.2
11		Infinity of infinity	0.500
						12	Optical filter	Infinity of infinity	0.210	1.519	64.2
13		Infinity of infinity	0.622
						14	Imaging surface	Infinity of infinity	-0.010

Aspherical surface

Table 28

Face numbering

2

3

4

5

6

7

K

0.215

-99.000

37.702

0.233

-1.286

10.147

A

3.E-05

-6.E-03

-3.E-02

-3.E-02

4.E-03

1.E-02

B

2.E-04

2.E-02

5.E-02

6.E-02

-2.E-03

-2.E-02

C

-1.E-04

-1.E-02

-5.E-02

-8.E-02

-9.E-03

1.E-02

D

4.E-05

8.E-03

4.E-02

7.E-02

1.E-02

-7.E-03

E

-7.E-06

-3.E-03

-1.E-02

-3.E-02

-7.E-03

3.E-03

F

7.E-07

5.E-04

3.E-03

9.E-03

2.E-03

-6.E-04

G

-3.E-08

-6.E-05

-5.E-04

-2.E-03

-3.E-04

1.E-04

H

-4.E-10

4.E-06

4.E-05

1.E-04

3.E-05

-9.E-06

J

4.E-11

-1.E-07

-1.E-06

-6.E-06

-9.E-07

3.E-07

The following table 29 shows characteristics of the optical imaging systems according to the first to fourteenth examples.

Table 29

Marking	Example 1	Example 2	Example 3	Example 4	Example 5	Example 6	Example 7
								f	19.00	17.62	19.00	19.00	21.00	19.00	19.00
f1	8.49	5.83	13.43	12.06	10.81	5.99	5.70
								f2	-8.02	-17.09	-13.43	-19.11	-33.39	-20.00	-20.00
f3	31.62	-10.78	23.11	110.28	-23.29	-9.88	-8.94
								TTL	23.169	21.758	23.716	23.782	24.510	22.786	23.327
PL	17.000	17.000	17.000	17.000	17.000	17.000	17.000
								BFL	18.80	18.80	18.81	18.80	18.90	18.80	18.80
	Example 8	Example 9	Example 10	Example 11	Example 12	Example 13	Example 14
								f	20.00	22.00	18.00	19.00	21.00	21.00	19.96
f1	8.23	9.91	6.63	8.97	8.86	8.86	9.18
								f2	-31.20	-15.34	-6.76	-305.55	-31.73	-35.41	-8.24
f3	-13.74	-65.49	51.26	-11.85	-15.49	-15.22	26.01
								TTL	24.040	25.470	21.053	22.840	25.739	25.751	25.934
PL	17.000	19.000	15.000	17.000	20.000	19.000	19.000
								BFL	18.90	20.80	19.80	18.80	21.80	20.80	21.30

As described above, the optical imaging system according to various examples can have a small size (small thickness) while having a long focal length.

While this disclosure includes particular examples, it will be apparent to those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be construed in an illustrative, and not a restrictive sense. The description of features or aspects in each example should be considered as applicable to similar features or aspects in other examples. Suitable results may still be achieved if the described techniques are performed to have different orders and/or if components in the described systems, architectures, devices or circuits are combined in different ways and/or replaced or supplemented by other components or their equivalents. Thus, the scope of the disclosure is not to be limited by the specific embodiments, but by the claims and their equivalents, and all modifications within the scope of the claims and their equivalents are to be construed as being included in the disclosure.

Claims (16)

1. An optical imaging system, comprising:

A first lens, a second lens, a third lens, a reflecting member, and an image sensor arranged in order from the object side,

Wherein the reflecting member comprises at least two reflecting surfaces configured to change the path of light passing through the first lens to the third lens and incident on the reflecting member at least twice, and

Wherein the optical imaging system has a total of three lenses.

2. The optical imaging system of claim 1, wherein the reflective member is a parallelogram prism.

3. The optical imaging system of claim 1, wherein the first lens and the second lens each have positive refractive power and the third lens has positive or negative refractive power.

4. The optical imaging system of claim 1, wherein at least one of the first to third lenses is composed of a plastic material.

5. The optical imaging system of claim 1, wherein any one of the first to third lenses is composed of a plastic material, another one of the first to third lenses is composed of a glass material, and the remaining ones of the first to third lenses are composed of a glass material or a plastic material.

6. The optical imaging system of claim 1, wherein 50< v1<90, wherein v1 is an abbe number of the first lens.

7. The optical imaging system of claim 1, wherein 1< TTL/f <1.4, wherein TTL is a distance from an object side surface of the first lens to an imaging surface of the image sensor, and f is a focal length of the optical imaging system.

8. The optical imaging system of claim 1, wherein 0.1< LL/PL <0.4, wherein LL is a distance from an object side of the first lens to an image side of the third lens, and PL is a length of the path of the light in the reflective member.

9. The optical imaging system of claim 1, wherein at least one of the object side of the first lens and the object side of the third lens is convex.

10. The optical imaging system of claim 1, wherein at least one of an image side of the second lens and an image side of the third lens is concave.

11. An optical imaging system, comprising:

a plurality of lenses including a first lens, a second lens, and a third lens;

An image sensor comprising an imaging surface; and

A prism disposed between the plurality of lenses and the image sensor and including a plurality of reflective surfaces each configured to reflect light,

Wherein 0.1< LL/PL <0.4, wherein LL is the distance from the object side of the first lens to the image side of the third lens, and PL is the length of the path of the light in the prism, and

Wherein the optical imaging system has a total of three lenses.

12. The optical imaging system of claim 11, wherein the prism has a parallelogram shape including a first reflective surface and a second reflective surface.

13. The optical imaging system of claim 11, wherein the first lens has positive refractive power and the object side of the first lens is convex.

14. The optical imaging system of claim 11, wherein 50< v1<90, wherein v1 is an abbe number of the first lens.

15. The optical imaging system of claim 11, wherein 0 +.v1-v 2<56, wherein v1 is the abbe number of the first lens and v2 is the abbe number of the second lens.

16. The optical imaging system of claim 11, wherein 0.02< BFL/f <1.0, wherein BFL is a distance on an optical axis from the image side of the third lens to the imaging surface of the image sensor, and f is a focal length of the optical imaging system.