CN118033877A

CN118033877A - Optical imaging system

Info

Publication number: CN118033877A
Application number: CN202311446466.XA
Authority: CN
Inventors: 许宰赫; 郑有镇; 金炳贤; 梁召渼
Original assignee: Samsung Electro Mechanics Co Ltd
Current assignee: Samsung Electro Mechanics Co Ltd
Priority date: 2022-11-11
Filing date: 2023-11-02
Publication date: 2024-05-14

Abstract

The present disclosure relates to an optical imaging system comprising: a first lens having a positive refractive power; a second lens having a refractive power; a third lens having a refractive power; a fourth lens having a refractive power; a fifth lens having a negative refractive power, wherein the first lens to the fifth lens are disposed in order from the object side; and a reflecting member having a plurality of reflecting surfaces to reflect light refracted by the fifth lens a plurality of times, wherein 3< BFL/TL <7 is satisfied, wherein BFL is a distance on an optical axis from an image side surface of the fifth lens to an imaging surface, and TL is a distance on the optical axis from an object side surface of the first lens to the image side surface of the fifth lens.

Description

Optical imaging system

Cross Reference to Related Applications

The present application claims priority from korean patent application No. 10-2022-0150877 filed on 11 months 2022 and korean patent application No. 10-2023-0034745 filed on 16 months 2023, which are all incorporated herein by reference for all purposes.

Technical Field

The present disclosure relates to optical imaging systems.

Background

The portable terminal may include a camera including an optical imaging system composed of a plurality of lenses to make video calls and capture images.

Further, as functions performed by cameras in portable terminals gradually increase, demands for cameras with high resolution for portable terminals may increase.

For example, in order to achieve clearer image quality, an image sensor having high pixels (e.g., 1300 ten thousand to 1 hundred million pixels, etc.) may be employed in a camera for a portable terminal.

Further, since the portable terminal may be miniaturized and a slim camera for the portable terminal may be required, it may be required to develop an optical imaging system capable of achieving high resolution while being slim.

For example, in the case of a camera for a portable terminal having a telephoto characteristic, optical axes of a plurality of lenses may be disposed in parallel in a length direction or a width direction of the portable terminal, and a reflection member may be disposed in front of the plurality of lenses to prevent an overall track length of the optical imaging system from affecting a thickness of the portable terminal.

However, in such a structure, the thickness of the portable terminal may increase with an increase in the diameters of the plurality of lenses.

The above information is presented merely as background information to aid in the understanding of the present disclosure. No determination is made as to whether any of the above can be applied as prior art with respect to the present disclosure, and no assertion is made.

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 having a positive refractive power; a second lens having a refractive power; a third lens having a refractive power; a fourth lens having a refractive power; a fifth lens having a negative refractive power, wherein the first lens to the fifth lens are disposed in order from the object side; and a reflecting member having a plurality of reflecting surfaces to reflect light refracted by the fifth lens a plurality of times, wherein 3< BFL/TL <7 is satisfied, wherein BFL is a distance on an optical axis from an image side surface of the fifth lens to an imaging surface, and TL is a distance on the optical axis from an object side surface of the first lens to the image side surface of the fifth lens.

Conditional expression 1< TTL/BFL <2 may be satisfied, where TTL is a distance on the optical axis from the object side surface to the imaging surface of the first lens.

The reflection member may include an incident surface on which the light refracted by the fifth lens is incident, a first reflection surface for reflecting the light, a second reflection surface for reflecting the light reflected from the first reflection surface, and an exit surface from which the light reflected from the second reflection surface exits, wherein PL/TTL <0.8 may be satisfied, wherein PL is a distance on an optical axis from the incident surface of the reflection member to the exit surface.

Conditional expression 1.3< f/f1<2.1 may be satisfied, where f is the total focal length of the first lens to the fifth lens, and f1 is the focal length of the first lens.

The conditional expression |f1/f2| <0.6 may be satisfied, where f2 is the focal length of the second lens.

Conditional expression 0< f1/|f23| <0.3 may be satisfied, where f23 is a combined focal length of the second lens and the third lens.

Conditional expression 1< TTL/f <1.5 can be satisfied.

Conditional expression 1.63< avg_n23<1.7 may be satisfied, wherein avg_n23 is an average value of the refractive index of the second lens and the refractive index of the third lens.

Conditional expression 2.7< Fno <4.6 can be satisfied, where Fno is the F-number of the optical imaging system.

Conditional expression 9< v1- (v2+v3) <37 may be satisfied, where v1 is the abbe number of the first lens, v2 is the abbe number of the second lens, and v3 is the abbe number of the third lens.

Each of the second lens and the third lens may have a refractive index greater than 1.61 and an abbe number less than 30.

Either one of the second lens and the third lens may have a refractive index greater than 1.66.

The difference in abbe number between the first lens and the second lens may be greater than 29, and the difference in abbe number between the second lens and the third lens may be less than 7.

The first lens may be formed of a glass material having an abbe number greater than 80, and the second to fifth lenses may be formed of a plastic material.

The first lens may be formed of a glass material having an abbe number greater than 80, the second lens may be formed of a glass material having an abbe number less than 30, and the third to fifth lenses may be formed of a plastic material.

The first lens may have a convex object side and a concave image side, the second lens may have a convex object side and a concave image side, the third lens may have a concave image side, and the fourth lens may have a convex object side.

In another general aspect, an optical imaging system includes: a first lens having a positive refractive power; a second lens having a refractive power; a third lens having a refractive power; a fourth lens having a refractive power; a fifth lens having a negative refractive power, wherein the first lens to the fifth lens are disposed in order from the object side; and a reflecting member having a plurality of reflecting surfaces to reflect light refracted by the fifth lens a plurality of times, wherein 2.7< Fno <4.6 is satisfied, wherein Fno is an F-number of the optical imaging system, and wherein 1< TTL/BFL <2 is satisfied, wherein BFL is a distance on an optical axis from an image side surface to an imaging surface of the fifth lens, and TTL is a distance on the optical axis from an object side surface to the imaging surface of the first lens.

The conditional expression PL/TTL <0.8 may be satisfied, where PL is a distance on the optical axis from the incident surface to the exit surface of the reflecting member.

In another general aspect, an optical imaging system includes: a first lens having a positive refractive power, a convex object side, and a concave image side; a second lens having a refractive power, a convex object side and a concave image side; a third lens having optical power and a concave image side surface; a fourth lens having optical power and a convex object side; a fifth lens having a negative refractive power and a concave image side surface, wherein the first lens to the fifth lens are disposed in order from the object side; and a reflecting member having a plurality of reflecting surfaces to reflect light refracted by the fifth lens a plurality of times, wherein 1.3< f/f1<2.1 is satisfied, where f is a total focal length of the first lens to the fifth lens, and f1 is a focal length of the first lens.

Conditional expression 3< BFL/TL <7 may be satisfied, where BFL is a distance on the optical axis from the image side surface of the fifth lens to the imaging surface, and TL is a distance on the optical axis from the object side surface of the first lens to the image side surface of the fifth lens.

Other features and aspects will be apparent from the following detailed description, the drawings, and the claims.

Drawings

Fig. 1 is a configuration diagram of an optical imaging system according to a first embodiment of the present disclosure.

Fig. 2 is a diagram showing aberration characteristics of the optical imaging system shown in fig. 1.

Fig. 3 is a configuration diagram of an optical imaging system according to a second embodiment of the present disclosure.

Fig. 4 is a diagram showing aberration characteristics of the optical imaging system shown in fig. 3.

Fig. 5 is a configuration diagram of an optical imaging system according to a third embodiment of the present disclosure.

Fig. 6 is a diagram showing aberration characteristics of the optical imaging system shown in fig. 5.

Fig. 7 is a configuration diagram of an optical imaging system according to a fourth embodiment of the present disclosure.

Fig. 8 is a diagram showing aberration characteristics of the optical imaging system shown in fig. 7.

Fig. 9 is a configuration diagram of an optical imaging system according to a fifth embodiment of the present disclosure.

Fig. 10 is a diagram showing aberration characteristics of the optical imaging system shown in fig. 9.

Fig. 11 is a configuration diagram of an optical imaging system according to a sixth embodiment of the present disclosure.

Fig. 12 is a diagram showing aberration characteristics of the optical imaging system shown in fig. 11.

Fig. 13 is a configuration diagram of an optical imaging system according to a seventh embodiment of the present disclosure.

Fig. 14 is a diagram showing aberration characteristics of the optical imaging system shown in fig. 13.

Fig. 15 is a configuration diagram of an optical imaging system according to an eighth embodiment of the present disclosure.

Fig. 16 is a diagram showing aberration characteristics of the optical imaging system shown in fig. 15.

Fig. 17 is a configuration diagram of an optical imaging system according to a ninth embodiment of the present disclosure.

Fig. 18 is a diagram showing aberration characteristics of the optical imaging system shown in fig. 17.

Fig. 19 is a configuration diagram of an optical imaging system according to a tenth embodiment of the present disclosure.

Fig. 20 is a diagram showing aberration characteristics of the optical imaging system shown in fig. 19.

Fig. 21 is a diagram of the optical imaging system shown in fig. 1 viewed from another angle.

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

Detailed Description

Hereinafter, although examples of the present disclosure will be described in detail with reference to the accompanying drawings, it should be noted that examples are not limited thereto.

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 after an understanding of the present disclosure. For example, the order of operations described herein is merely an example and is not limited to the order set forth herein, but may be altered as will be apparent after an understanding of the disclosure, except for operations that must occur in a certain order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

The features described herein may be implemented in different forms and are not to be construed as limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways to implement the methods, devices, and/or systems described herein that will be apparent upon an understanding of the present disclosure.

Throughout the specification, when an element (such as a layer, region or substrate) is referred to as being "on," "connected to" or "coupled to" another element, it can be directly on, connected to or coupled to the other element or one or more other elements intervening therebetween. 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 therebetween.

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

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 mentioned in examples described herein 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.

Spatially relative terms, such as "above," "upper," "lower," and the like, may be used herein for ease of description to describe one element's relationship to another element as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "upper" relative to another element would then be "below" or "lower" relative to the other element. Thus, the term "above" includes both above and below orientations, depending on the spatial orientation of the device. The device may also be oriented in other ways (rotated 90 degrees or at 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, amounts, operations, components, elements, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, amounts, operations, components, elements, and/or groups thereof.

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

In this document, it is noted that the term "may" is used with respect to an example, for example with respect to what an example may include or implement, meaning that there is at least one example that includes or implements this feature, and all examples and embodiments are not limited thereto.

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

One aspect of the present disclosure may provide an optical imaging system capable of achieving a small size and high resolution.

In the following lens arrangement diagrams, the thickness, size and shape of the lens may be shown in a slightly exaggerated manner for the purpose of illustration, and in particular, spherical or aspherical shapes presented in the lens arrangement diagrams are presented as examples only and are not limited thereto.

An optical imaging system according to embodiments of the present disclosure may include a plurality of lenses disposed on an optical axis. Each of the plurality of lenses may be disposed to be spaced apart from each other by a predetermined distance along the optical axis.

For example, the optical imaging system may include five lenses.

Among the plurality of lenses of the optical imaging system, the foremost lens means a lens closest to the object side, and the rearmost lens means a lens closest to the reflecting member.

For example, in an embodiment consisting of five lenses, the first lens refers to the lens closest to the object side, and the fifth lens refers to the lens closest to the reflecting member.

In addition, in each lens, the first surface means a surface (or object side) closest to the object side, and the second surface means a surface (or image side) closest to the image side. Further, in this specification, units of all numerical values of radius of curvature, thickness, distance, focal length, and the like are expressed in millimeters, and units of field of view (FOV) are expressed in degrees.

Further, in the present specification, in the explanation of the shape of each lens, a convex shape on one surface may mean that a paraxial region of the surface is convex, and a concave shape on one surface may mean that a paraxial region of the surface is concave. Therefore, even when one surface of the lens is described as having a convex shape, the edge portion of the lens may be concave. Similarly, even when one surface of the lens is described as having a concave shape, the edge portion of the lens may be convex.

Meanwhile, the paraxial region refers to a very narrow region near and including the optical axis.

The imaging plane may refer to an imaginary plane on which a focal point is formed by the optical imaging system. Alternatively, the imaging plane may refer to one surface of the image sensor through which light is received. The imaging plane may be a plane perpendicular to the optical axis of the optical imaging system.

An optical imaging system according to an embodiment of the present disclosure includes five lenses.

For example, an optical imaging system according to an embodiment of the present disclosure includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens disposed in order from an object side. Each of the first to fifth lenses is disposed to be spaced apart from each other by a predetermined distance along the first optical axis.

However, the optical imaging system according to the embodiment of the present disclosure includes not only 5 lenses, but also other components.

For example, the optical imaging system may further include a reflecting member having a plurality of reflecting surfaces for changing the optical path. Each reflective surface of the reflective member may be configured to change the optical path by 90 ° (degrees).

The reflecting member may be disposed at the rear of the plurality of lenses. For example, the reflecting member may be disposed between the fifth lens and the imaging plane (or the image sensor). The reflecting member may be a mirror or a prism having a plurality of reflecting surfaces.

Referring to fig. 21, when the reflecting member P is a prism, the prism includes an incident surface IP on which light is incident, a first reflecting surface P1 for reflecting light passing through the incident surface IP, a second reflecting surface P2 for reflecting light reflected by the first reflecting surface P1, and an exit surface EP from which light exits. For example, the prism may be configured to have a parallelogram shape when viewed from the side.

The light passing through the first to fifth lenses may pass through an incident surface of the reflective member, and the optical path may be changed by 90 ° on the first reflective surface, and the optical path may be changed by 90 ° on the second reflective surface, and the light may pass through an exit surface of the reflective member and be incident on the imaging plane.

The optical imaging system may further comprise an image sensor for converting an incident image of the object into an electrical signal.

In addition, the optical imaging system may further include an infrared cut filter (hereinafter referred to as "filter") for blocking infrared rays. The filter is disposed between the reflecting member and the imaging surface.

In addition, the optical imaging system may further include a diaphragm for adjusting the amount of light.

The effective radius of the first lens may be greater than the effective radius of the other lenses. That is, among the first to fifth lenses, the first lens may have the largest effective radius.

A portion of the plurality of lenses has at least one aspheric surface.

For example, at least one of the first and second surfaces of the fourth and fifth lenses may be aspherical. Here, the aspherical surface of each lens may be represented by formula 1.

1 (1)

In equation 1, c is the curvature (inverse of the radius of curvature) of the lens, K is a conic constant, and Y is the distance from an arbitrary point on the aspherical surface of the lens to the optical axis. Further, constants a to D mean aspherical surface coefficients. Z (SAG) represents a distance in the optical axis direction between an arbitrary point on the aspherical surface of the lens and an apex of the aspherical surface.

The optical imaging system according to the embodiment of the present disclosure may satisfy at least one of the following conditional expressions.

(Conditional expression 1) 1.3< f/f1<2.1

(Conditional expression 2) 1< TTL/f <1.5

(Conditional expression 3) PL/TTL <0.8

(Conditional expression 4) 0.6< PL/TTL <0.8

(Conditional expression 5) |f1/f2| <0.6

(Conditional expression 6) 0< f1/|f23| <0.3

(Conditional expression 7) 1.63< avg_n23<1.7

(Conditional expression 8) 1< TTL/BFL <2

(Conditional expression 9) 3< BFL/TL <7

(Conditional expression 10) 2.7< FNo <4.6

(Conditional expression 11) 9< v1- (v2+v3) <37

In the conditional expression, f is the total focal length of the optical imaging system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f23 is the combined focal length of the second lens and the third lens.

TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface, and PL is the distance on the optical axis from the incident surface to the exit surface of the reflecting member.

BFL is the distance on the optical axis from the image side of the fifth lens element to the image plane, and TL is the distance on the optical axis from the object side of the first lens element to the image side of the fifth lens element.

Fno is the F-number of the optical imaging system, v1 is the abbe number of the first lens, v2 is the abbe number of the second lens, v3 is the abbe number of the third lens, and avg_n23 is the average of the refractive index of the second lens and the refractive index of the third lens.

In this specification, TTL may mean the sum of the distance between the object side surface of the first lens and the first reflective surface of the reflective member, the distance between the first reflective surface and the second reflective surface of the reflective member, and the distance between the second reflective surface of the reflective member and the imaging surface. BFL may mean the sum of the distance between the image side surface of the fifth lens and the first reflective surface of the reflective member, the distance between the first reflective surface and the second reflective surface of the reflective member, and the distance between the second reflective surface of the reflective member and the imaging surface, and PL may represent the sum of the distance between the incident surface and the first reflective surface, the distance between the first reflective surface and the second reflective surface, and the distance between the second reflective surface and the exit surface of the reflective member.

In one or more examples, the at least two lenses disposed in succession may be high refractive lenses. For example, each of the second lens and the third lens has a refractive index greater than 1.61. For example, any one of the at least two high refractive lenses disposed in succession has a refractive index greater than 1.66.

Each of the at least two lenses disposed in succession may have an abbe number of less than 30. For example, each of the second lens and the third lens may have an abbe number of less than 30.

In addition, the first to third lenses may be formed of materials having different optical characteristics. For example, the first lens may be a material having a relatively large abbe number, and each of the second lens and the third lens may be formed of a material having a smaller abbe number than that of the first lens. Therefore, the chromatic aberration correction capability can be improved. The difference in abbe number between the first lens and the second lens may be greater than 29. The difference in abbe number between the second lens and the third lens may be less than 7.

In an embodiment, all of the first to fifth lenses may be formed of a plastic material.

In an embodiment, any one of the first to fifth lenses may be formed of a glass material, and the other lenses may be formed of a plastic material. For example, the first lens may be formed of a glass material, and the second to fifth lenses may be formed of a plastic material. In this case, the first lens has an abbe number greater than 80.

In an embodiment, two of the first to fifth lenses may be formed of a glass material, and the remaining lenses may be formed of a plastic material. For example, the first lens and the second lens may be formed of a glass material, and the third lens to the fifth lens may be formed of a plastic material. In this case, the first lens may have an abbe number greater than 80, and the second lens may have an abbe number less than 30.

An optical imaging system according to embodiments of the present disclosure may have the characteristics of a telephoto lens having a relatively narrow field of view and a long focal length.

Further, the optical imaging system according to the embodiment of the present disclosure may be configured such that the diagonal length of the imaging plane is relatively large. For example, the effective capture area of the image sensor may be wider (i.e., a high pixel image sensor).

Therefore, when a captured image is cropped, images according to various magnifications can be captured without degrading image quality.

An optical imaging system according to a first embodiment of the present disclosure will be described with reference to fig. 1 and 2.

The optical imaging system according to the first embodiment of the present disclosure may include an optical system including a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, and a fifth lens 150, and the optical imaging system may further include a filter 160 and an image sensor.

The optical imaging system according to the first embodiment of the present disclosure may form a focal point on the imaging plane 170. Imaging plane 170 may refer to the surface on which the focal point is formed by the optical imaging system. For example, imaging plane 170 may refer to one surface of an image sensor through which light is received.

The optical imaging system may further include a reflecting member P disposed between the fifth lens 150 and the imaging plane 170 and having a plurality of reflecting surfaces for changing an optical path. For example, the reflective member P includes a first reflective surface P1 and a second reflective surface P2. The reflecting member P may be a prism, but may also be provided as a mirror.

Table 1 shows lens characteristics (radius of curvature, thickness of lenses or distance between lenses, refractive index, abbe number, and focal length) of each lens.

TABLE 1

According to a first embodiment of the present disclosure, the total focal length (f) is 17.9357mm, the combined focal length (f 23) of the second lens 120 and the third lens 130 is 355.675mm, the field of view (FOV) is 18.93 °, and Fno is 4.5.

In a first embodiment of the present disclosure, the first lens 110 has a positive refractive power, the first surface of the first lens 110 is convex, and the second surface of the first lens 110 is concave. The second lens 120 has a negative refractive power, the first surface of the second lens 120 is convex, and the second surface of the second lens 120 is concave. The third lens 130 has a positive refractive power, the first surface of the third lens 130 is convex, and the second surface of the third lens 130 is concave. The fourth lens 140 has a positive refractive power, the first surface of the fourth lens 140 is convex, and the second surface of the fourth lens 140 is concave. The fifth lens 150 has a negative refractive power, the first surface of the fifth lens 150 is convex, and the second surface of the fifth lens 150 is concave.

According to the first embodiment of the present disclosure, each surface of the fourth lens 140 and the fifth lens 150 has an aspherical surface coefficient as shown in table 2. For example, the object-side surface of the fourth lens element 140 and the image-side surface of the fifth lens element 150 are aspheric.

TABLE 2

Further, the optical imaging system configured as described above may have the aberration characteristics shown in fig. 2.

An optical imaging system according to a second embodiment of the present disclosure will be described with reference to fig. 3 and 4.

The optical imaging system according to the second embodiment of the present disclosure may include an optical system including a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, and a fifth lens 250, and the optical imaging system may further include an optical filter 260 and an image sensor.

The optical imaging system according to the second embodiment of the present disclosure may form a focal point on the imaging surface 270. Imaging surface 270 may refer to the surface on which the focal point is formed by the optical imaging system. For example, imaging plane 270 may refer to one surface of an image sensor through which light is received.

The optical imaging system may further include a reflecting member P disposed between the fifth lens 250 and the imaging plane 270 and having a plurality of reflecting surfaces for changing an optical path. For example, the reflective member P includes a first reflective surface P1 and a second reflective surface P2. The reflecting member P may be a prism, but may also be provided as a mirror.

Table 3 shows lens characteristics (radius of curvature, thickness of lenses or distance between lenses, refractive index, abbe number, and focal length) of each lens.

TABLE 3 Table 3

According to a second embodiment of the present disclosure, the total focal length (f) is 17.5745mm, the combined focal length (f 23) of the second lens 220 and the third lens 230 is-45.374 mm, the field of view (FOV) is 19.36 °, and Fno is 3.5.

In a second embodiment of the present disclosure, the first lens 210 has a positive refractive power, the first surface of the first lens 210 is convex, and the second surface of the first lens 210 is concave. The second lens 220 has a negative refractive power, the first surface of the second lens 220 is convex, and the second surface of the second lens 220 is concave. The third lens 230 has a positive refractive power, the first surface of the third lens 230 is convex, and the second surface of the third lens 230 is concave. The fourth lens 240 has a negative refractive power, the first surface of the fourth lens 240 is convex, and the second surface of the fourth lens 240 is concave. The fifth lens 250 has a negative refractive power, the first surface of the fifth lens 250 is convex, and the second surface of the fifth lens 250 is concave.

According to the second embodiment of the present disclosure, each surface of the fourth lens 240 and the fifth lens 250 has an aspherical surface coefficient as shown in table 4. For example, the object-side surface of the fourth lens element 240 and the image-side surface of the fifth lens element 250 are aspheric.

TABLE 4 Table 4

	S1	S2	S3	S4	S5
						Cone constant (K)	0.000	0.000	0.000	0.000	0.000
Fourth order coefficient (A)	0.000	0.000	0.000	0.000	0.000
						Sixth order coefficient (B)	0.000	0.000	0.000	0.000	0.000
Eighth order coefficient (C)	0.000	0.000	0.000	0.000	0.000
						Tenth order coefficient (D)	0.000	0.000	0.000	0.000	0.000
	S6	S7	S8	S9	S10
						Cone constant (K)	0.000	-1.097	0.000	0.000	7.245
Fourth order coefficient (A)	0.000	3.3029E-02	0.000	0.000	-2.4027E-02
						Sixth order coefficient (B)	0.000	9.2861E-03	0.000	0.000	-7.5562E-03
Eighth order coefficient (C)	0.000	1.0741E-03	0.000	0.000	5.4256E-03
						Tenth order coefficient (D)	0.000	-1.8004E-05	0.000	0.000	2.6493E-03

Further, the optical imaging system configured as described above may have the aberration characteristics shown in fig. 4.

An optical imaging system according to a third embodiment of the present disclosure will be described with reference to fig. 5 and 6.

The optical imaging system according to the third embodiment of the present disclosure may include an optical system including a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, and a fifth lens 350, and the optical imaging system may further include a filter 360 and an image sensor.

The optical imaging system according to the third embodiment of the present disclosure may form a focal point on the imaging plane 370. Imaging plane 370 may refer to the surface on which the focal point is formed by the optical imaging system. For example, the imaging plane 370 may refer to one surface of the image sensor through which light is received.

The optical imaging system may further include a reflecting member P disposed between the fifth lens 350 and the imaging plane 370 and having a plurality of reflecting surfaces for changing an optical path. For example, the reflective member P includes a first reflective surface P1 and a second reflective surface P2. The reflecting member P may be a prism, but may also be provided as a mirror.

Table 5 shows lens characteristics (radius of curvature, thickness of lenses or distance between lenses, refractive index, abbe number, and focal length) of each lens.

TABLE 5

According to a third embodiment of the present disclosure, the total focal length (f) is 27.0295mm, the combined focal length (f 23) of the second lens 320 and the third lens 330 is-54.912 mm, the field of view (FOV) is 18.87 °, and Fno is 3.7.

In a third embodiment of the present disclosure, the first lens 310 has a positive refractive power, the first surface of the first lens 310 is convex, and the second surface of the first lens 310 is concave. The second lens 320 has a negative refractive power, the first surface of the second lens 320 is convex, and the second surface of the second lens 320 is concave. The third lens 330 has a negative refractive power, the first surface of the third lens 330 is convex, and the second surface of the third lens 330 is concave. The fourth lens 340 has positive refractive power, and the first and second surfaces of the fourth lens 340 are convex. The fifth lens 350 has a negative refractive power, and the first and second surfaces of the fifth lens 350 are concave.

According to the third embodiment of the present disclosure, each surface of the fourth lens 340 and the fifth lens 350 has an aspherical surface coefficient as shown in table 6. For example, the object side surface of the fourth lens element 340 and the image side surface of the fifth lens element 350 are aspheric.

TABLE 6

	S1	S2	S3	S4	S5
						Cone constant (K)	0.000	0.000	0.000	0.000	0.000
Fourth order coefficient (A)	0.000	0.000	0.000	0.000	0.000
						Sixth order coefficient (B)	0.000	0.000	0.000	0.000	0.000
Eighth order coefficient (C)	0.000	0.000	0.000	0.000	0.000
						Tenth order coefficient (D)	0.000	0.000	0.000	0.000	0.000
	S6	S7	S8	S9	S10
						Cone constant (K)	0.000	6.754	0.000	0.000	6.966
Fourth order coefficient (A)	0.000	4.6569E-02	0.000	0.000	-3.7082E-02
						Sixth order coefficient (B)	0.000	1.5805E-02	0.000	0.000	-1.1260E-02
Eighth order coefficient (C)	0.000	1.9874E-03	0.000	0.000	8.0653E-03
						Tenth order coefficient (D)	0.000	5.2633E-05	0.000	0.000	4.0137E-03

Further, the optical imaging system configured as described above may have the aberration characteristics shown in fig. 6.

An optical imaging system according to a fourth embodiment of the present disclosure will be described with reference to fig. 7 and 8.

The optical imaging system according to the fourth embodiment may include an optical system including a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, and a fifth lens 450, and the optical imaging system may further include a filter 460 and an image sensor.

The optical imaging system according to the fourth embodiment of the present disclosure may form a focal point on the imaging plane 470. Imaging plane 470 may refer to the surface on which the focal point is formed by the optical imaging system. For example, the imaging plane 470 may refer to one surface of the image sensor through which light is received.

The optical imaging system may further include a reflecting member P disposed between the fifth lens 450 and the imaging plane 470 and having a plurality of reflecting surfaces for changing an optical path. For example, the reflective member P includes a first reflective surface P1 and a second reflective surface P2. The reflecting member P may be a prism, but may also be provided as a mirror.

Table 7 shows lens characteristics (radius of curvature, thickness of lenses or distance between lenses, refractive index, abbe number, and focal length) of each lens.

TABLE 7

According to a fourth embodiment of the present disclosure, the total focal length (f) is 25.7516mm, the combined focal length (f 23) of the second lens 420 and the third lens 430 is-53.767 mm, the field of view (FOV) is 17.04 °, and Fno is 4.3.

In a fourth embodiment of the present disclosure, the first lens 410 has a positive refractive power, the first surface of the first lens 410 is convex, and the second surface of the first lens 410 is concave. The second lens 420 has a positive refractive power, the first surface of the second lens 420 is convex, and the second surface of the second lens 420 is concave. The third lens 430 has a negative refractive power, and the first and second surfaces of the third lens 430 are concave. The fourth lens 440 has positive refractive power, and the first and second surfaces of the fourth lens 440 are convex. The fifth lens 450 has a negative refractive power, and the first and second surfaces of the fifth lens 450 are concave.

According to a fourth embodiment of the present disclosure, each surface of the fourth lens 440 and the fifth lens 450 has an aspherical surface coefficient as shown in table 8. For example, the object-side surface of the fourth lens element 440 and the image-side surface of the fifth lens element 450 are aspheric.

TABLE 8

	S1	S2	S3	S4	S5
						Cone constant (K)	0.000	0.000	0.000	0.000	0.000
Fourth order coefficient (A)	0.000	0.000	0.000	0.000	0.000
						Sixth order coefficient (B)	0.000	0.000	0.000	0.000	0.000
Eighth order coefficient (C)	0.000	0.000	0.000	0.000	0.000
						Tenth order coefficient (D)	0.000	0.000	0.000	0.000	0.000
	S6	S7	S8	S9	S10
						Cone constant (K)	0.000	7.001	0.000	0.000	6.169
Fourth order coefficient (A)	0.000	4.4983E-02	0.000	0.000	-4.2604E-02
						Sixth order coefficient (B)	0.000	1.4691E-02	0.000	0.000	-1.0321E-02
Eighth order coefficient (C)	0.000	1.2177E-03	0.000	0.000	7.4719E-03
						Tenth order coefficient (D)	0.000	-7.2996E-05	0.000	0.000	3.0641E-03

Further, the optical imaging system configured as described above may have the aberration characteristics shown in fig. 8.

An optical imaging system according to a fifth embodiment of the present disclosure will be described with reference to fig. 9 and 10.

The optical imaging system according to the fifth embodiment of the present disclosure may include an optical system including a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, and a fifth lens 550, and the optical imaging system may further include a filter 560 and an image sensor.

The optical imaging system according to the fifth embodiment of the present disclosure may form a focus on the imaging plane 570. Imaging plane 570 may refer to the surface on which the focal point is formed by the optical imaging system. For example, the imaging plane 570 may refer to one surface of the image sensor through which light is received.

The optical imaging system may further include a reflecting member P disposed between the fifth lens 550 and the imaging plane 570 and having a plurality of reflecting surfaces for changing an optical path. For example, the reflective member P includes a first reflective surface P1 and a second reflective surface P2. The reflecting member P may be a prism, but may also be provided as a mirror.

Table 9 shows the lens characteristics (radius of curvature, thickness of lenses or distance between lenses, refractive index, abbe number, and focal length) of each lens.

TABLE 9

According to a fifth embodiment of the present disclosure, the total focal length (f) is 25.6925mm, the combined focal length (f 23) of the second lens 520 and the third lens 530 is-59.894 mm, the field of view (FOV) is 19.84 °, and Fno is 3.6.

In a fifth embodiment of the present disclosure, the first lens 510 has a positive refractive power, the first surface of the first lens 510 is convex, and the second surface of the first lens 510 is concave. The second lens 520 has a positive refractive power, the first surface of the second lens 520 is convex, and the second surface of the second lens 520 is concave. The third lens 530 has a negative refractive power, the first surface of the third lens 530 is convex, and the second surface of the third lens 530 is concave. The fourth lens 540 has a negative refractive power, the first surface of the fourth lens 540 is convex, and the second surface of the fourth lens 540 is concave. The fifth lens 550 has a negative refractive power, a first surface of the fifth lens 550 is convex, and a second surface of the fifth lens 550 is concave.

According to a fifth embodiment of the present disclosure, each surface of the fourth lens 540 and the fifth lens 550 has an aspherical surface coefficient as shown in table 10. For example, the object-side surface of the fourth lens 540 and the image-side surface of the fifth lens 550 are aspherical.

Table 10

	S1	S2	S3	S4	S5
						Cone constant (K)	0.000	0.000	0.000	0.000	0.000
Fourth order coefficient (A)	0.000	0.000	0.000	0.000	0.000
						Sixth order coefficient (B)	0.000	0.000	0.000	0.000	0.000
Eighth order coefficient (C)	0.000	0.000	0.000	0.000	0.000
						Tenth order coefficient (D)	0.000	0.000	0.000	0.000	0.000
	S6	S7	S8	S9	S10
						Cone constant (K)	0.000	6.326	0.000	0.000	5.802
Fourth order coefficient (A)	0.000	4.5885E-02	0.000	0.000	-4.3638E-02
						Sixth order coefficient (B)	0.000	1.2610E-02	0.000	0.000	-8.5422E-03
Eighth order coefficient (C)	0.000	-4.6826E-04	0.000	0.000	6.5223E-03
						Tenth order coefficient (D)	0.000	-4.0156E-04	0.000	0.000	2.6836E-03

Further, the optical imaging system configured as described above may have the aberration characteristics shown in fig. 10.

An optical imaging system according to a sixth embodiment of the present disclosure will be described with reference to fig. 11 and 12.

The optical imaging system according to the sixth embodiment of the present disclosure may include an optical system including a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, and a fifth lens 650, and the optical imaging system may further include a filter 660 and an image sensor.

The optical imaging system according to the sixth embodiment of the present disclosure may form a focal point on the imaging plane 670. Imaging plane 670 may refer to a surface on which a focal point is formed by an optical imaging system. For example, the imaging plane 670 may refer to one surface of the image sensor through which light is received.

The optical imaging system may further include a reflecting member P disposed between the fifth lens 650 and the imaging plane 670 and having a plurality of reflecting surfaces for changing an optical path. For example, the reflective member P includes a first reflective surface P1 and a second reflective surface P2. The reflecting member P may be a prism, but may also be provided as a mirror.

The lens characteristics (radius of curvature, thickness of lenses or distance between lenses, refractive index, abbe number, and focal length) of each lens are shown in table 11.

TABLE 11

According to a sixth embodiment of the present disclosure, the total focal length (f) is 25.6924mm, the combined focal length (f 23) of the second lens 620 and the third lens 630 is-60.422 mm, the field of view (FOV) is 19.84 °, and Fno is 3.6.

In the sixth embodiment of the present disclosure, the first lens 610 has a positive refractive power, the first surface of the first lens 610 is convex, and the second surface of the first lens 610 is concave. The second lens 620 has a negative refractive power, the first surface of the second lens 620 is convex, and the second surface of the second lens 620 is concave. The third lens 630 has a negative refractive power, the first surface of the third lens 630 is convex, and the second surface of the third lens 630 is concave. The fourth lens 640 has a negative refractive power, a first surface of the fourth lens 640 is convex, and a second surface of the fourth lens 640 is concave. The fifth lens 650 has a negative refractive power, a first surface of the fifth lens 650 is convex, and a second surface of the fifth lens 650 is concave.

According to the sixth embodiment of the present disclosure, each surface of the fourth lens 640 and the fifth lens 650 has an aspherical surface coefficient as shown in table 12. For example, the object-side surface of the fourth lens element 640 and the image-side surface of the fifth lens element 650 are aspheric.

Table 12

	S1	S2	S3	S4	S5
						Cone constant (K)	0.000	0.000	0.000	0.000	0.000
Fourth order coefficient (A)	0.000	0.000	0.000	0.000	0.000
						Sixth order coefficient (B)	0.000	0.000	0.000	0.000	0.000
Eighth order coefficient (C)	0.000	0.000	0.000	0.000	0.000
						Tenth order coefficient (D)	0.000	0.000	0.000	0.000	0.000
	S6	S7	S8	S9	S10
						Cone constant (K)	0.000	6.390	0.000	0.000	5.724
Fourth order coefficient (A)	0.000	4.6140E-02	0.000	0.000	-4.3353E-02
						Sixth order coefficient (B)	0.000	1.2653E-02	0.000	0.000	-8.2880E-03
Eighth order coefficient (C)	0.000	-5.2151E-04	0.000	0.000	6.4432E-03
						Tenth order coefficient (D)	0.000	-4.4183E-04	0.000	0.000	2.6185E-03

Further, the optical imaging system configured as described above may have aberration characteristics shown in fig. 12.

An optical imaging system according to a seventh embodiment of the present disclosure will be described with reference to fig. 13 and 14.

The optical imaging system according to the seventh embodiment of the present disclosure may include an optical system including a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, and a fifth lens 750, and the optical imaging system may further include a filter 760 and an image sensor.

The optical imaging system according to the seventh embodiment of the present disclosure may form a focal point on the imaging plane 770. Imaging plane 770 may refer to the surface on which the focal point is formed by the optical imaging system. For example, the imaging plane 770 may refer to one surface of the image sensor through which light is received.

The optical imaging system may further include a reflecting member P disposed between the fifth lens 750 and the imaging plane 770 and having a plurality of reflecting surfaces for changing an optical path. For example, the reflective member P includes a first reflective surface P1 and a second reflective surface P2. The reflecting member P may be a prism, but it may also be provided as a mirror.

The lens characteristics (radius of curvature, thickness of lenses or distance between lenses, refractive index, abbe number, and focal length) of each lens are shown in table 13.

TABLE 13

According to a seventh embodiment of the present disclosure, the total focal length (f) is 26.3794mm, the combined focal length (f 23) of the second lens 720 and the third lens 730 is 67.384mm, the field of view (FOV) is 19.31 °, and Fno is 3.7.

In a seventh embodiment of the present disclosure, the first lens 710 has a positive refractive power, a first surface of the first lens 710 is convex, and a second surface of the first lens 710 is concave. The second lens 720 has a positive refractive power, the first surface of the second lens 720 is convex, and the second surface of the second lens 720 is concave. The third lens 730 has a negative refractive power, the first surface of the third lens 730 is convex, and the second surface of the third lens 730 is concave. The fourth lens 740 has a positive refractive power, a first surface of the fourth lens 740 is convex, and a second surface of the fourth lens 740 is concave. The fifth lens 750 has a negative refractive power, a first surface of the fifth lens 750 is convex, and a second surface of the fifth lens 750 is concave.

According to a seventh embodiment of the present disclosure, each surface of the fourth lens 740 and the fifth lens 750 has an aspherical surface coefficient as shown in table 14. For example, the object-side surface of the fourth lens 740 and the image-side surface of the fifth lens 750 are aspheric.

TABLE 14

	S1	S2	S3	S4	S5
						Cone constant (K)	0.000	0.000	0.000	0.000	0.000
Fourth order coefficient (A)	0.000	0.000	0.000	0.000	0.000
						Sixth order coefficient (B)	0.000	0.000	0.000	0.000	0.000
Eighth order coefficient (C)	0.000	0.000	0.000	0.000	0.000
						Tenth order coefficient (D)	0.000	0.000	0.000	0.000	0.000
	S6	S7	S8	S9	S10
						Cone constant (K)	0.000	-6.343	0.000	0.000	4.660
Fourth order coefficient (A)	0.000	5.3589E-02	0.000	0.000	-1.9858E-02
						Sixth order coefficient (B)	0.000	1.8425E-02	0.000	0.000	-1.3145E-02
Eighth order coefficient (C)	0.000	1.8890E-03	0.000	0.000	7.5008E-03
						Tenth order coefficient (D)	0.000	-5.6871E-05	0.000	0.000	3.8089E-03

Further, the optical imaging system configured as described above may have the aberration characteristics shown in fig. 14.

An optical imaging system according to an eighth embodiment of the present disclosure will be described with reference to fig. 15 and 16.

The optical imaging system according to the eighth embodiment of the present disclosure may include an optical system including a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, and a fifth lens 850, and the optical imaging system may further include a filter 860 and an image sensor.

The optical imaging system according to the eighth embodiment of the present disclosure may form a focal point on the imaging surface 870. Imaging surface 870 may refer to a surface on which a focal point is formed by an optical imaging system. For example, the imaging surface 870 may refer to one surface of the image sensor through which light is received.

The optical imaging system may further include a reflecting member P disposed between the fifth lens 850 and the imaging surface 870 and having a plurality of reflecting surfaces for changing an optical path. For example, the reflective member P includes a first reflective surface P1 and a second reflective surface P2. The reflecting member P may be a prism, but it may also be provided as a mirror.

The lens characteristics (radius of curvature, thickness of lenses or distance between lenses, refractive index, abbe number, and focal length) of each lens are shown in table 15.

TABLE 15

According to an eighth embodiment of the present disclosure, the total focal length (f) is 22.1449mm, the combined focal length (f 23) of the second lens 820 and the third lens 830 is 65.433mm, the field of view (FOV) is 22.80 °, and Fno is 3.

In an eighth embodiment of the present disclosure, the first lens 810 has a positive refractive power, the first surface of the first lens 810 is convex, and the second surface of the first lens 810 is concave. The second lens 820 has a positive refractive power, a first surface of the second lens 820 is convex, and a second surface of the second lens 820 is concave. The third lens 830 has a negative refractive power, the first surface of the third lens 830 is convex, and the second surface of the third lens 830 is concave. The fourth lens 840 has a positive refractive power, a first surface of the fourth lens 840 is convex, and a second surface of the fourth lens 840 is concave. The fifth lens 850 has a negative refractive power, a first surface of the fifth lens 850 is convex, and a second surface of the fifth lens 850 is concave.

According to an eighth embodiment of the present disclosure, each surface of the fourth lens 840 and the fifth lens 850 has an aspherical surface coefficient as shown in table 16. For example, the object-side surface of the fourth lens 840 and the image-side surface of the fifth lens 850 are aspherical.

Table 16

	S1	S2	S3	S4	S5
						Cone constant (K)	0.000	0.000	0.000	0.000	0.000
Fourth order coefficient (A)	0.000	0.000	0.000	0.000	0.000
						Sixth order coefficient (B)	0.000	0.000	0.000	0.000	0.000
Eighth order coefficient (C)	0.000	0.000	0.000	0.000	0.000
						Tenth order coefficient (D)	0.000	0.000	0.000	0.000	0.000
	S6	S7	S8	S9	S10
						Cone constant (K)	0.000	-7.101	0.000	0.000	3.470
Fourth order coefficient (A)	0.000	5.2727E-02	0.000	0.000	-2.3865E-02
						Sixth order coefficient (B)	0.000	1.9801E-02	0.000	0.000	-1.3209E-02
Eighth order coefficient (C)	0.000	8.9334E-04	0.000	0.000	7.0935E-03
						Tenth order coefficient (D)	0.000	-1.8426E-04	0.000	0.000	2.3433E-03

Further, the optical imaging system configured as described above may have the aberration characteristics shown in fig. 16.

An optical imaging system according to a ninth embodiment of the present disclosure will be described with reference to fig. 17 and 18.

The optical imaging system according to the ninth embodiment of the present disclosure may include an optical system including a first lens 910, a second lens 920, a third lens 930, a fourth lens 940, and a fifth lens 950, and the optical imaging system may further include a filter 960 and an image sensor.

The optical imaging system according to the ninth embodiment of the present disclosure may form a focal point on the imaging plane 970. Imaging plane 970 may refer to the surface on which the focal point is formed by the optical imaging system. For example, imaging plane 970 may refer to one surface of an image sensor through which light is received.

The optical imaging system may further include a reflecting member P disposed between the fifth lens 950 and the imaging surface 970, and having a plurality of reflecting surfaces for changing an optical path. For example, the reflective member P includes a first reflective surface P1 and a second reflective surface P2. The reflecting member P may be a prism, but may also be provided as a mirror.

The lens characteristics (radius of curvature, thickness of lenses or distance between lenses, refractive index, abbe number, and focal length) of each lens are shown in table 17.

TABLE 17

According to a ninth embodiment of the present disclosure, the total focal length (f) is 20.6629mm, the combined focal length (f 23) of the second and third lenses 920, 930 is 120.107mm, the field of view (FOV) is 24.24 °, and Fno is 2.9.

In a ninth embodiment of the present disclosure, the first lens 910 has a positive refractive power, the first surface of the first lens 910 is convex, and the second surface of the first lens 910 is concave. The second lens 920 has a positive refractive power, a first surface of the second lens 920 is convex, and a second surface of the second lens 920 is concave. The third lens 930 has a negative refractive power, a first surface of the third lens 930 is convex, and a second surface of the third lens 930 is concave. The fourth lens 940 has positive refractive power, and the first and second surfaces of the fourth lens 940 are convex. The fifth lens 950 has a negative refractive power, and the first and second surfaces of the fifth lens 950 are concave.

According to a ninth embodiment of the present disclosure, each surface of the fourth lens 940 and the fifth lens 950 has an aspherical surface coefficient shown in table 18. For example, the object-side surface of the fourth lens 940 and the image-side surface of the fifth lens 950 are aspherical.

TABLE 18

	S1	S2	S3	S4	S5
						Cone constant (K)	0.000	0.000	0.000	0.000	0.000
Fourth order coefficient (A)	0.000	0.000	0.000	0.000	0.000
						Sixth order coefficient (B)	0.000	0.000	0.000	0.000	0.000
Eighth order coefficient (C)	0.000	0.000	0.000	0.000	0.000
						Tenth order coefficient (D)	0.000	0.000	0.000	0.000	0.000
	S6	S7	S8	S9	S10
						Cone constant (K)	0.000	-7.041	0.000	0.000	2.511
Fourth order coefficient (A)	0.000	5.7406E-02	0.000	0.000	-2.6976E-02
						Sixth order coefficient (B)	0.000	2.7334E-02	0.000	0.000	-1.1861E-02
Eighth order coefficient (C)	0.000	2.3004E-03	0.000	0.000	6.1575E-03
						Tenth order coefficient (D)	0.000	-2.3473E-04	0.000	0.000	6.7858E-03

Further, the optical imaging system configured as described above may have aberration characteristics shown in fig. 18.

An optical imaging system according to a tenth embodiment of the present disclosure will be described with reference to fig. 19 and 20.

The optical imaging system according to the tenth embodiment of the present disclosure may include an optical system including a first lens 1010, a second lens 1020, a third lens 1030, a fourth lens 1040, and a fifth lens 1050, and may further include a filter 1060 and an image sensor.

The optical imaging system according to the tenth embodiment of the present disclosure may form a focal point on the imaging surface 1070. Imaging surface 1070 may refer to the surface on which the focal point is formed by the optical imaging system. For example, the imaging surface 1070 may refer to one surface of the image sensor through which light is received.

The optical imaging system may further include a reflecting member P disposed between the fifth lens 1050 and the imaging surface 1070 and having a plurality of reflecting surfaces for changing an optical path. For example, the reflective member P includes a first reflective surface P1 and a second reflective surface P2. The reflecting member P may be a prism, but it may also be provided as a mirror.

The lens characteristics (radius of curvature, thickness of lenses or distance between lenses, refractive index, abbe number, and focal length) of each lens are shown in table 19.

TABLE 19

According to a tenth embodiment of the present disclosure, the total focal length (f) is 20.6295mm, the combined focal length (f 23) of the second and third lenses 1020, 1030 is-106.897 mm, the field of view (FOV) is 24.71 °, and Fno is 2.8.

In a tenth embodiment of the present disclosure, the first lens 1010 has a positive refractive power, the first surface of the first lens 1010 is convex, and the second surface of the first lens 1010 is concave. The second lens 1020 has a positive refractive power, the first surface of the second lens 1020 is convex, and the second surface of the second lens 1020 is concave. The third lens 1030 has a negative refractive power, and the first and second surfaces of the third lens 1030 are concave. The fourth lens 1040 has positive refractive power, and the first and second surfaces of the fourth lens 1040 are convex. The fifth lens 1050 has a negative refractive power, and the first and second surfaces of the fifth lens 1050 are concave.

According to a tenth embodiment of the present disclosure, each surface of the fourth lens 1040 and the fifth lens 1050 has an aspherical surface coefficient as shown in table 20. For example, the object-side surface of the fourth lens 1040 and the image-side surface of the fifth lens 1050 are aspherical.

Table 20

	S1	S2	S3	S4	S5
						Cone constant (K)	0.000	0.000	0.000	0.000	0.000
Fourth order coefficient (A)	0.000	0.000	0.000	0.000	0.000
						Sixth order coefficient (B)	0.000	0.000	0.000	0.000	0.000
Eighth order coefficient (C)	0.000	0.000	0.000	0.000	0.000
						Tenth order coefficient (D)	0.000	0.000	0.000	0.000	0.000
	S6	S7	S8	S9	S10
						Cone constant (K)	0.000	-7.474	0.000	0.000	2.922
Fourth order coefficient (A)	0.000	5.4355E-02	0.000	0.000	-5.5165E-02
						Sixth order coefficient (B)	0.000	2.5566E-02	0.000	0.000	-9.8109E-03
Eighth order coefficient (C)	0.000	2.6907E-03	0.000	0.000	5.1140E-03
						Tenth order coefficient (D)	0.000	4.1402E-05	0.000	0.000	6.9618E-03

Further, the optical imaging system configured as described above may have the aberration characteristics shown in fig. 20.

As described above, according to the optical imaging system according to one or more embodiments of the present disclosure, the size of the optical imaging system can be reduced, and a high-resolution image can be captured.

While specific examples have been shown and described above, it will be apparent after an understanding of the present disclosure that various changes in form and details may be made therein without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered as illustrative only and not for the purpose of limitation. The descriptions of features or aspects in each example are considered to be applicable to similar features or aspects in other examples. Suitable results may also be obtained if the described techniques are performed in a different order and/or if components in the described systems, architectures, devices or circuits are combined in a different manner and/or are replaced or supplemented by other components or their equivalents. Therefore, the scope of the present disclosure is defined not by the detailed description but by the claims and their equivalents, and all changes within the scope of the claims and their equivalents are to be construed as being included in the present disclosure.

Claims

1. An optical imaging system, comprising:

A first lens having a positive refractive power;

a second lens having a refractive power;

a third lens having a refractive power;

A fourth lens having a refractive power;

a fifth lens having a negative refractive power, wherein the first lens to the fifth lens are disposed in order from an object side; and

A reflecting member having a plurality of reflecting surfaces to reflect the light refracted by the fifth lens a plurality of times,

Wherein 3< BFL/TL <7 is satisfied, wherein BFL is a distance on an optical axis from an image side surface of the fifth lens to an imaging surface, and TL is a distance on the optical axis from an object side surface of the first lens to the image side surface of the fifth lens, and

Wherein the total of five lenses with refractive power in the optical imaging system.

2. The optical imaging system of claim 1, wherein 1< TTL/BFL <2 is satisfied, wherein TTL is a distance on the optical axis from the object side surface of the first lens to the imaging surface.

3. The optical imaging system according to claim 1, wherein the reflecting member includes an incident surface on which the light refracted by the fifth lens is incident, a first reflecting surface for reflecting the light, a second reflecting surface for reflecting the light reflected from the first reflecting surface, and an exit surface from which the light reflected from the second reflecting surface exits,

Wherein PL/TTL <0.8 is satisfied, wherein PL is a distance on the optical axis from the incident surface to the exit surface of the reflecting member, and TTL is a distance on the optical axis from the object side surface to the imaging surface of the first lens.

4. The optical imaging system of claim 1, wherein 1.3< f/f1<2.1 is satisfied, where f is a total focal length of the first lens to the fifth lens, and f1 is a focal length of the first lens.

5. The optical imaging system of claim 1, wherein |f1/f2| <0.6 is satisfied, wherein f1 is a focal length of the first lens and f2 is a focal length of the second lens.

6. The optical imaging system of claim 1, wherein 0< f1/|f23| <0.3 is satisfied, wherein f1 is a focal length of the first lens, and f23 is a combined focal length of the second lens and the third lens.

7. The optical imaging system of claim 1, wherein 1< TTL/f <1.5 is satisfied, wherein TTL is a distance on the optical axis from the object side surface of the first lens to the imaging surface, and f is a total focal length of the first lens to the fifth lens.

8. The optical imaging system of claim 1, wherein 1.63< avg_n23<1.7 is satisfied, wherein avg_n23 is an average of the refractive index of the second lens and the refractive index of the third lens.

9. The optical imaging system of claim 1, wherein 2.7< Fno <4.6 is satisfied, wherein Fno is an F-number of the optical imaging system.

10. The optical imaging system of claim 1, wherein 9< v1- (v2+v3) <37 is satisfied, wherein v1 is an abbe number of the first lens, v2 is an abbe number of the second lens, and v3 is an abbe number of the third lens.

11. The optical imaging system of claim 1, wherein each of the second lens and the third lens has a refractive index greater than 1.61 and an abbe number less than 30.

12. The optical imaging system of claim 11, wherein any of the second lens and the third lens has a refractive index greater than 1.66.

13. The optical imaging system of claim 11, wherein a difference in abbe number between the first lens and the second lens is greater than 29 and a difference in abbe number between the second lens and the third lens is less than 7.

14. The optical imaging system of claim 13, wherein the first lens is formed of a glass material having an abbe number greater than 80 and the second to fifth lenses are formed of a plastic material.

15. The optical imaging system of claim 13, wherein the first lens is formed of a glass material having an abbe number greater than 80, the second lens is formed of a glass material having an abbe number less than 30, and the third to fifth lenses are formed of a plastic material.

16. The optical imaging system of claim 1, wherein the first lens has a convex object side and a concave image side, the second lens has a convex object side and a concave image side, the third lens has a concave image side, and the fourth lens has a convex object side.

17. An optical imaging system, comprising:

A first lens having a positive refractive power;

a second lens having a refractive power;

a third lens having a refractive power;

A fourth lens having a refractive power;

Wherein the total of five lenses with refractive power in the optical imaging system,

Wherein 2.7< FNo <4.6 is satisfied, wherein FNo is the F-number of the optical imaging system, and

Wherein 1< TTL/BFL <2 is satisfied, wherein BFL is a distance on the optical axis from an image side surface to an imaging surface of the fifth lens, and TTL is a distance on the optical axis from an object side surface to the imaging surface of the first lens.

18. The optical imaging system of claim 17, wherein PL/TTL <0.8 is satisfied, wherein PL is a distance on the optical axis from an entrance surface to an exit surface of the reflecting member.

19. An optical imaging system, comprising:

A first lens having a positive refractive power, a convex object side, and a concave image side;

A second lens having a refractive power, a convex object side and a concave image side;

a third lens having optical power and a concave image side surface;

a fourth lens having optical power and a convex object side;

a fifth lens having a negative refractive power and a concave image side surface, wherein the first lens to the fifth lens are disposed in order from the object side; and

Wherein 1.3< f/f1<2.1 is satisfied, where f is the total focal length of the first lens to the fifth lens, and f1 is the focal length of the first lens, and

20. The optical imaging system of claim 19, wherein 3< BFL/TL <7 is satisfied, where BFL is a distance on the optical axis from an image side surface to an imaging surface of the fifth lens, and TL is a distance on the optical axis from an object side surface of the first lens to the image side surface of the fifth lens.