CN117310942A

CN117310942A - Imaging lens system

Info

Publication number: CN117310942A
Application number: CN202311500064.3A
Authority: CN
Inventors: 许宰赫; 郑有镇; 梁召渼
Original assignee: Samsung Electro Mechanics Co Ltd
Current assignee: Samsung Electro Mechanics Co Ltd
Priority date: 2022-11-24
Filing date: 2023-11-01
Publication date: 2023-12-29

Abstract

An imaging lens system is provided. The imaging lens system includes: a lens group including a plurality of lenses; and an optical path conversion member disposed between the lens group and the imaging surface. The lens group may include a first lens, a second lens, a third lens, and a fourth lens disposed in order from the object side toward the imaging surface. The optical path conversion member may reflect light emitted from the lens group twice or more to increase a back focal length of the lens group (or a distance from an image side surface to an imaging surface of a lens disposed on a rearmost side of the lens group).

Description

Imaging lens system

Cross Reference to Related Applications

The present application claims the priority rights of korean patent application No. 10-2022-0159541 filed at the korean intellectual property office at 11 months of 2022 and korean patent application No. 10-2023-0036426 filed at the korean intellectual property office at 21 months of 2023, the disclosures of which are incorporated herein by reference for all purposes.

Technical Field

The following description relates to tele imaging lens systems.

Background

For an imaging lens system having a long focal length (for example, a telephoto imaging lens system), it is difficult to have a small thickness and a minute size, and thus it is difficult to install the system in a small-sized terminal. However, there is an increasing demand for improvement in operation and improvement in performance of small terminals (e.g., smart phones), which results in an increasing demand for installation of a telephoto imaging lens system in the small terminals.

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 a general aspect, an imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, and an optical path conversion member disposed in order from an object side toward an imaging surface, wherein 0.70< PL/TTL <0.90, wherein PL is a distance from an incident surface of the optical path conversion member to an exit surface of the optical path conversion member, and TTL is a distance from an object side surface of the first lens to the imaging surface.

The first lens may have a convex object side.

The first lens may have a convex image side.

The second lens may have a concave object-side surface.

The second lens may have a concave image side surface.

The third lens may have a convex object side.

The third lens may have a concave image side surface.

The fourth lens may have a convex image side.

The fourth lens may have a concave image side surface.

In a general aspect, an imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, and an optical path conversion member disposed in order from an object side toward an imaging surface, wherein 0.80< f/PL <1.20, wherein PL is a distance from an incident surface of the optical path conversion member to an exit surface of the optical path conversion member, and f is a focal length of the imaging lens system.

The first lens may have positive refractive power.

3.0< f-number <5.0.

1.60< f/f1<3.20, where f1 is the focal length of the first lens.

1.0< TTL/f <1.40, where TTL is the distance from the object side of the first lens to the imaging plane.

0.40< (r1+r8)/PL <0.60, where R1 is the radius of curvature of the object-side surface of the first lens and R8 is the radius of curvature of the image-side surface of the fourth lens.

0.10< IMG HT/PL <0.18, wherein IMG HT is the height of the imaging plane.

The second lens may have positive refractive power.

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

Drawings

FIG. 1 illustrates a configuration diagram of an exemplary imaging lens system in accordance with one or more embodiments.

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

FIG. 3 illustrates a configuration diagram of an exemplary imaging lens system in accordance with one or more embodiments.

Fig. 4 shows aberration curves of the exemplary imaging lens system shown in fig. 3.

Fig. 5 illustrates a configuration diagram of an exemplary imaging lens system in accordance with one or more embodiments.

Fig. 6 shows aberration curves of the exemplary imaging lens system shown in fig. 5.

Fig. 7 illustrates a configuration diagram of an exemplary imaging lens system in accordance with one or more embodiments.

Fig. 8 shows aberration curves of the exemplary imaging lens system shown in fig. 7.

Fig. 9 illustrates a configuration diagram of an exemplary imaging lens system in accordance with one or more embodiments.

Fig. 10 shows aberration curves of the exemplary imaging lens system shown in fig. 9.

FIG. 11 illustrates a configuration diagram of an exemplary imaging lens system in accordance with one or more embodiments.

Fig. 12 shows aberration curves of the exemplary imaging lens system shown in fig. 11.

Fig. 13 illustrates a configuration diagram of an exemplary imaging lens system in accordance with one or more embodiments.

Fig. 14 shows aberration curves of the exemplary imaging lens system shown in fig. 13.

Fig. 15 illustrates a configuration diagram of an exemplary imaging lens system in accordance with one or more embodiments.

Fig. 16 shows aberration curves of the exemplary imaging lens system shown in fig. 15.

Fig. 17 shows a configuration diagram of a modification of the exemplary imaging lens system.

FIG. 18 illustrates a perspective view of an exemplary electronic device in accordance with one or more embodiments.

Throughout the drawings and detailed description, the same reference numerals will be understood to refer to the same or similar elements, features and structures unless otherwise described or provided. 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 alterations, modifications and equivalents of the methods, devices and/or systems described herein will be apparent upon an understanding of the disclosure of the present application. For example, the order in which operations are described herein and/or the order in which operations are described herein is merely an example, and is not limited to the order set forth herein, except in which operations must occur in a particular sequence and/or order of operations, but may be varied as will be apparent upon review of the disclosure of the present application. As another example, an order of operations and/or an order of operations may be performed in parallel, except for an order of operations and/or an order of operations that must occur in one sequence (e.g., a particular sequence). In addition, descriptions of features that are known after understanding the present disclosure may be omitted for 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 are provided solely to illustrate some of the many possible ways of implementing the methods, devices, and/or systems described herein that will be apparent after an understanding of the present disclosure. Herein, the use of the word "may" (e.g., what may be included or implemented with respect to an example or embodiment) means that there is at least one example or embodiment in which such features are included or implemented, and all examples or embodiments are not so limited. The phrase "example" or "embodiment" as used herein has the same meaning, e.g., the phrase "in one example" has the same meaning as "in one embodiment" and "in one or more examples" has the same meaning as "in one or more embodiments".

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. As used herein, the term "and/or" includes any one of the listed items associated and any combination of any two or more. As a non-limiting example, 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, or groups thereof. Furthermore, although an embodiment may describe the presence of the stated features, numbers, operations, components, elements, and/or combinations thereof, other embodiments may exist where one or more of the stated features, numbers, operations, components, elements, and/or combinations thereof may not exist.

Throughout the specification, when a component, element, or layer is referred to as being "on," "connected to," "coupled to," or "joined to" another component, element, or layer, it can be directly "on," "connected to," "coupled to," or "joined to" the other component, element, or layer (e.g., in contact with the other component, element, or layer), or one or more other components, elements, layers may reasonably be present between the component, element, or layer and the other component, element, or layer. When a component, element, or layer is referred to as being "directly on," "directly connected to," "directly coupled to," or "directly engaged to" another component, element, or layer, there are no other components, elements, or layers intervening between the component, element, or layer and the other component, element, or layer. Also, expressions such as "between …" and "directly between …" element "adjacent" and "directly adjacent" can be interpreted as described previously.

Although terms such as "first," "second," and "third," or A, B, (a), (b), etc., may be used herein to describe various elements, components, regions, layers, or sections, these elements, components, regions, layers, or sections are not limited by these terms. Each of these terms is not intended to limit, for example, the importance, sequence, or order of the corresponding member, component, region, layer, or section, but is only used to distinguish the corresponding member, component, region, layer, or section from other members, components, regions, layers, or sections. 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.

As used herein, the term "and/or" includes any one of the listed items associated and any combination of any two or more. The phrases "at least one of A, B and C", "at least one of A, B or C", etc. are intended to have separate meanings, and these phrases "at least one of A, B and C", "at least one of A, B or C", etc. also include examples in which one or more of each of A, B and/or C may be present (e.g., any combination of one or more of each of A, B and C), unless the respective description and embodiment requires interpretation of the list (e.g., "at least one of A, B and C") as having a combined meaning.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs and especially after understanding the disclosure of this application. Terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art, particularly in the context of the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

In an example, a tele-imaging lens system may be installed in a portable electronic device.

One or more examples may provide a tele imaging lens system having a long focal length and that may be installed in a small terminal.

In one or more examples, the first lens may indicate a lens closest to the object (or subject). In addition, the numbers of the lenses may indicate the order in which the lenses are arranged from the object side to the imaging surface in the optical axis direction. For example, the second lens may indicate a lens disposed second from the object side, and the third lens may indicate a lens disposed third from the object side. In one or more examples, the radius of curvature, thickness, distance from the object side surface to the imaging surface (TTL) of the lens, height IMG HT of the imaging surface, and focal length of the lens are expressed in millimeters (mm).

Each of the thickness of the lenses, the distance between the lenses, TTL, and the incident angle may be a size calculated based on the optical axis of the imaging lens system. Further, in describing the shape of the lens, a convex surface of the lens may indicate that the paraxial region of the corresponding surface is convex, and a concave surface of the lens may indicate that the paraxial region of the corresponding surface is concave. Thus, while one or more examples may describe one surface of the lens as being convex, an edge portion of the lens may be concave. Also, while one or more examples may describe the surface of the lens as concave, the edge portion of the lens may be convex.

In an example, the imaging lens system described herein may be installed in a portable electronic device. For example, by way of example only, the imaging lens system may be installed in a smart phone (or portable terminal), a laptop computer, an augmented reality device, a virtual reality device, a portable game machine, or the like. However, the range of use and the use examples of the imaging lens system described herein may not be limited to the above-described electronic apparatus. In an example, the imaging lens system may be applied to electronic devices that may require high resolution imaging while providing a narrow installation space.

The imaging lens system described herein may reduce the external dimensions of the imaging lens system while ensuring a long Back Focal Length (BFL) (or distance from the image side to the imaging side of the final lens). In an example, the imaging lens system described herein may reduce the outer dimensions of the imaging lens system while ensuring the BFL required to achieve a tele imaging lens system by using reflective members. In another example, the imaging lens system described herein may provide an imaging surface having a substantial size for achieving high resolution. In yet another example, the imaging lens system described herein may have an integrated form that is installed in a portable terminal while ensuring a long focal length or long BFL.

In one or more examples, the light path conversion member may refer to any member that may allow light to be reflected. In an example, the optical path conversion member may be collectively referred to as a reflector, a prism, or the like, as just an example. Thus, in one or more examples, the reflector, prism, and light path conversion member may all refer to the same component or interchangeable components.

The imaging lens system according to the first aspect of the present disclosure may include a lens group and an optical path conversion member. In the imaging lens system according to the first aspect, the lens group may include a plurality of lenses. In an example, the lens group may include a first lens, a second lens, a third lens, and a fourth lens disposed in order from the object side to the imaging surface. In the imaging lens system according to the first aspect, the optical path conversion member may include a plurality of reflecting surfaces. In a non-limiting example, the light path conversion member may include two reflective surfaces. As a specific example, the optical path conversion member may include a first reflection surface and a second reflection surface. The light path conversion member may include a pair of incident surfaces and an exit surface. The entrance surface may be disposed closest to the lens group and the exit surface may be disposed closest to the imaging plane.

The imaging lens system according to the second aspect of the present disclosure may include a lens group and an optical path conversion member. In the imaging lens system according to the second aspect, the lens group may include a plurality of lenses. In an example, the lens group may include a first lens, a second lens, a third lens, and a fourth lens disposed in order from the object side to the imaging surface. In the imaging lens system according to the second aspect, the optical path conversion member may include a plurality of reflecting surfaces substantially parallel to each other. For example, the first and second reflecting surfaces of the optical path conversion member may be parallel to each other.

The imaging lens system according to the third aspect of the present disclosure may include a lens group and an optical path conversion member. In the imaging lens system according to the third aspect, the lens group may include a plurality of lenses. In an example, the lens group may include a first lens, a second lens, a third lens, and a fourth lens disposed in order from the object side to the imaging surface. In the imaging lens system according to the third aspect, the optical path conversion member may include an incident surface and an exit surface that are substantially parallel to each other. In an example, the incident surface and the exit surface of the light path conversion member may be parallel to each other. In the imaging lens system according to the third aspect, the optical path conversion member may include a plurality of reflecting surfaces. For example, the light path conversion member may include two reflection surfaces disposed between the incident surface and the exit surface.

The imaging lens system according to the fourth aspect of the present disclosure may include a lens group and an optical path conversion member. The lens group and the optical path conversion member may be disposed sequentially from the object side to the imaging plane. In other words, the optical path conversion member may be disposed between the lens group and the imaging plane, or on the image side of the last lens in the lens group. In the imaging lens system according to the fourth aspect, the lens group may include a plurality of lenses. For example, the lens group may include a first lens, a second lens, a third lens, and a fourth lens disposed in order from the object side to the imaging surface. In the imaging lens system according to the fourth aspect, the optical path conversion member may include a pair of an incident surface and an exit surface. The entrance surface may be disposed closest to the lens group and the exit surface may be disposed closest to the imaging plane. The imaging lens system according to the fourth aspect may satisfy a unique conditional expression. For example, the imaging lens system according to the fourth aspect may satisfy the following conditional expression: 0.70< PL/TTL <0.90. For reference, in the conditional expression, TTL is a distance from the object side surface to the imaging surface of the foremost lens (or first lens) in the lens group, and PL is a distance (based on the optical path) from the incident surface to the exit surface of the optical path conversion member.

The imaging lens system according to the fifth aspect of the present disclosure may include a first lens, a second lens, a third lens, a fourth lens, and an optical path conversion member disposed in order from the object side to the imaging surface. In the imaging lens system according to the fifth aspect, the optical path conversion member may include a pair of an incident surface and an exit surface. The entrance surface may be disposed closest to the fourth lens, and the exit surface may be disposed closest to the imaging plane. The imaging lens system according to the fifth aspect may satisfy a unique conditional expression. For example, the imaging lens system according to the fifth aspect may satisfy the following conditional expression: 0.80< f/PL <1.20. For reference, in the conditional expression, f is a focal length of the imaging lens system.

The imaging lens system according to the sixth aspect of the present disclosure may satisfy one or more of the following conditional expressions. However, the imaging lens system according to not only the sixth aspect may satisfy the following conditional expression. For example, the imaging lens system according to the first to fifth aspects and the seventh or eighth aspects described below may satisfy one or more of the following conditional expressions:

3.0< f-number <5.0

1.60<f/f1<3.20

16mm<f

1.0<TTL/f<1.40

0.70<PL/TTL<0.90。

In the conditional expression, f is a focal length of the imaging lens system, f1 is a focal length of a foremost lens (or first lens) in the lens group, TTL is a distance from an object side surface of the foremost lens (or first lens) in the lens group to the imaging surface, and PL is a distance (based on an optical path) from an incident surface to an exit surface of the optical path conversion member.

The imaging lens system according to the seventh aspect of the present disclosure may satisfy one or more of the following conditional expressions. However, the imaging lens system according to not only the seventh aspect may satisfy the following conditional expression. For example, the imaging lens system according to the first to sixth aspects described above and the eighth aspect described below may satisfy one or more of the following conditional expressions:

16mm<PL

11mm<PD12

0.61<PD12/f<0.68。

in the conditional expression, the PD12 is a distance from the first reflecting surface to the second reflecting surface of the optical path conversion member (alternatively, a distance from the reflecting surface of the optical path conversion member closest to the last lens in the lens group to the reflecting surface of the optical path conversion member closest to the imaging surface).

The imaging lens system according to the eighth aspect of the present disclosure may satisfy one or more of the following conditional expressions. However, the imaging lens system according to not only the eighth aspect may satisfy the following conditional expression. For example, the imaging lens system according to the first to seventh aspects described above may satisfy one or more of the following conditional expressions:

0.80<f/PL<1.20

0.70<(|f1|+|f4|)/PL<2.4

1.8<(|f3|+|f4|)/PL<6.0

2.0<(|f1|+|f3|+|f4|)/PL<6.2

0.30<|f4/PL|<2.0

0.10<|R7/PL|<3.0

0.10<|R8/PL|<1.0

0.40<(R1+R8)/PL<0.60

0.10<TL14/PL<0.30

0.10<IMG HT/PL<0.18

2.10<(TTL+IMG HT)/PL<2.60

1.20<(TTL+f)/PL<1.60。

In the conditional expression, f1 is the focal length of the first lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, R1 is the radius of curvature of the object side of the first lens, R7 is the radius of curvature of the object side of the fourth lens, R8 is the radius of curvature of the image side of the fourth lens, TL14 is the distance from the object side of the first lens to the image side of the fourth lens, and IMG HT is the height of the imaging plane.

The imaging lens system according to the first to eighth aspects may include one or more lenses having the following characteristics, if necessary. For example, the imaging lens system according to the first aspect may include one of the first to fourth lenses having the following characteristics. In another example, the imaging lens system according to the second aspect may include two or more of the first to fourth lenses having the following characteristics. However, the imaging lens system according to the above aspect may not necessarily include a lens having the following characteristics.

The first lens may have optical power. For example, the first lens may have positive refractive power. The first lens may have a convex surface. For example, the first lens may have a convex object side. The first lens may have a predetermined refractive index. For example, the refractive index of the first lens may be 1.4 or more. As a specific example, the refractive index of the first lens may be greater than 1.4 and less than 1.6. The first lens may have a predetermined abbe number. For example, the abbe number of the first lens may be 50 or more. As a specific example, the abbe number of the first lens may be greater than 50 and less than 90. The first lens may have a predetermined focal length. For example, the focal length of the first lens may be determined in the range of 5.0mm to 12.0 mm.

The second lens may have optical power in its paraxial region or in its peripheral region. For example, the second lens may have positive or negative refractive power in the paraxial region. In another example, the second lens may have positive or negative refractive power in the edge region (in this example, the object-side and image-side surfaces of the second lens may be substantially flat (only in the paraxial region)). The second lens may have a concave surface or a flat surface. For example, the second lens may have a concave image side. In another example, the second lens may have a flat image side. The second lens may have a predetermined refractive index. For example, the refractive index of the second lens may be 1.5 or more. As a specific example, the refractive index of the second lens may be greater than 1.5 and less than 1.7. The second lens may have a predetermined abbe number. For example, the abbe number of the second lens may be 20 or more.

The third lens may have a refractive power. For example, the third lens may have positive or negative refractive power. The third lens may have a convex surface. For example, the third lens may have a convex object side. The third lens may have a predetermined refractive index. For example, the refractive index of the third lens may be 1.5 or more. As a specific example, the refractive index of the third lens may be greater than 1.5 and less than 1.70. The third lens may have a predetermined abbe number.

The fourth lens may have a refractive power. For example, the fourth lens may have positive or negative refractive power. The fourth lens may have a convex surface. For example, the fourth lens may have a convex object side. The fourth lens may have a predetermined refractive index. For example, the refractive index of the fourth lens may be 1.5 or more. As a specific example, the refractive index of the fourth lens may be greater than 1.5 and less than 1.7.

The aspherical surfaces of the first to fourth lenses may be represented by equation 1. In equation 1, c is the inverse of the radius of curvature of the corresponding lens, k is a conic constant, r is the distance from any point on the aspherical surface of the lens to the optical axis, a to J represent the aspherical constants, and Z (or SAG) is the height in the optical axis direction from any point on the aspherical surface to the vertex of the aspherical surface.

Equation 1:

the electronic device according to the first aspect of the present disclosure may have a thin form factor for easy carrying or storage. For example, by way of example only, an electronic device according to an aspect may be a smart phone, a laptop computer, or the like. An electronic device according to one aspect may include a camera module having a long focal length while achieving high resolution. For example, the electronic device may be equipped with a camera module including one of the imaging lens systems according to the first to fifth aspects described above. However, the imaging lens system included in the camera module may not be limited to the imaging lens systems according to the first to fifth aspects described above.

Hereinafter, one or more examples will now be described in detail with reference to the accompanying drawings.

An exemplary imaging lens system according to a first embodiment will be described with reference to fig. 1.

The imaging lens system 100 according to the first embodiment may include a lens group LG and a prism P, which is one type of optical path conversion member. However, the components of the imaging lens system 100 are not limited to the above-described components. For example, the imaging lens system 100 may further include a filter IF and an imaging plane IP. The lens group LG and the prism P may be disposed sequentially from the object side to the imaging plane IP. In an example, the lens group LG may be disposed on the object side of the prism P, and the prism P may be disposed between the lens group LG and the imaging plane IP.

Next, the above-described components are described in order.

The lens group LG may include a plurality of lenses. For example, the lens group LG may include a first lens 110, a second lens 120, a third lens 130, and a fourth lens 140 disposed in order from the object side to the imaging plane IP. The first to fourth lenses 110 to 140 may be disposed at predetermined intervals. For example, the image side of the first lens element 110 may not be in contact with the object side of the second lens element 120, and the image side of the second lens element 120 may not be in contact with the object side of the third lens element 130. However, this is merely an example, and the first to fourth lenses 110 to 140 may not necessarily be disposed spatially apart from each other. For example, the image side of the first lens element 110 can be in contact with the object side of the second lens element 120, and the image side of the second lens element 120 can be in contact with the object side of the third lens element 130.

Next, characteristics of the first lens 110 to the fourth lens 140 will be described.

The first lens 110 may have a positive refractive power, and may have a convex object side and a convex image side. The second lens 120 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The third lens 130 may have a positive refractive power, and may have a convex object side and a concave image side. The fourth lens 140 may have a negative refractive power, and may have a convex object side and a concave image side.

Next, the prism P as the optical path conversion member will be described. For reference, the prism described below may be one type of the optical path conversion member, and may be changed to another member.

The prism P may include a plurality of reflecting surfaces. For example, the prism P may include a first reflective surface and a second reflective surface. In an example, the first reflective surface and the second reflective surface may be substantially parallel to each other. The first reflective surface and the second reflective surface may have a substantial distance therebetween. In an example, a distance from the first reflective surface to the second reflective surface may be greater than a height IMG HT of the imaging plane IP. In another example, the distance from the first reflective surface to the second reflective surface may be greater than four times the height IMG HT of the imaging plane IP.

The filter IF and the imaging plane IP may be disposed adjacent to the exit surface of the prism P.

The filter IF may block light of a specific wavelength. For example, the filter IF according to one or more embodiments may block infrared light. However, the type of light blocked by the filter IF is not limited to infrared light. In an example, the filter IF may block ultraviolet light or visible light.

The imaging plane IP may be disposed at a point where light reflected from the prism P IS condensed or an image IS formed, and may be formed by an image sensor IS or the like. In an example, the imaging plane IP may be formed on or inside the image sensor IS.

The imaging lens system 100 configured as above may exhibit the aberration characteristics shown in fig. 2. Tables 1 and 2 below each show lens characteristics and aspherical values of the imaging lens system according to the first embodiment.

TABLE 1

Face number	Component part	Radius of curvature	Thickness/distance	Refractive index	Abbe number
						S1	First lens	4.011	1.199	1.537	55.7
S2		-14.850	0.100
						S3	Second lens	-12.671	0.897	1.537	55.7
S4		61.237	0.100
						S5	Third lens	8.7443	0.281	1.619	26.0
S6		14.0998	0.090
						S7	Fourth lens	13.9517	0.300	1.619	26.0
S8		3.61527	1.000
						S9	Prism	Infinity of infinity	2.500	1.518	64.2
S10		Infinity of infinity	11.500	1.518	64.2
						S11		Infinity of infinity	3.000	1.518	64.2
S12		Infinity of infinity	0.300
						S13	Optical filter	Infinity of infinity	0.210	1.518	64.2
S14		Infinity of infinity	0.293
						S15	Imaging surface	Infinity of infinity	-0.005

TABLE 2

An exemplary imaging lens system according to a second embodiment will be described with reference to fig. 3.

The exemplary imaging lens system 200 according to the second embodiment may include a lens group LG and a prism P, which is one type of optical path conversion member. However, the components of the imaging lens system 200 are not limited to the above-described components. In an example, the imaging lens system 200 may further include a filter IF and an imaging plane IP. The lens group LG and the prism P may be disposed sequentially from the object side to the imaging plane IP. In an example, the lens group LG may be disposed on the object side of the prism P, and the prism P may be disposed between the lens group LG and the imaging plane IP.

Next, the above-described components are described in order.

The lens group LG may include a plurality of lenses. In an example, the lens group LG may include a first lens 210, a second lens 220, a third lens 230, and a fourth lens 240 disposed in order from the object side to the imaging plane IP. In an example, the first to fourth lenses 210 to 240 may be disposed at predetermined intervals. In a non-limiting example, the image side of the first lens 210 may not be in contact with the object side of the second lens 220, and the image side of the second lens 220 may not be in contact with the object side of the third lens 230. However, this is merely an example, and the first lens 210 to the fourth lens 240 may not necessarily be disposed spatially apart from each other. For example, the image side of the first lens element 210 can be in contact with the object side of the second lens element 220, and the image side of the second lens element 220 can be in contact with the object side of the third lens element 230.

Next, characteristics of the first lens 210 to the fourth lens 240 will be described.

The first lens 210 may have a positive refractive power, and may have a convex object side and a convex image side. The second lens 220 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The third lens 230 may have a negative refractive power, and may have a concave object side surface and a convex image side surface. The fourth lens 240 may have a negative refractive power and may have a concave object side surface and a concave image side surface.

Next, the prism P as the optical path conversion member will be described. For reference, the prism described below is one type of the optical path conversion member, and may be changed to another member.

The prism P may include a plurality of reflecting surfaces. For example, the prism P may include a first reflective surface and a second reflective surface. In an example, the first reflective surface and the second reflective surface may be substantially parallel to each other. The first reflective surface and the second reflective surface may have a substantial distance therebetween. For example, a distance from the first reflective surface to the second reflective surface may be greater than a height IMG HT of the imaging plane IP. In another example, the distance from the first reflective surface to the second reflective surface may be greater than four times the height IMG HT of the imaging plane IP.

The filter IF may block light of a specific wavelength. In an example, the filter IF according to one or more embodiments may block infrared light. However, the type of light blocked by the filter IF is not limited to infrared light. For example, the filter IF may block ultraviolet light or visible light.

The imaging lens system 200 configured as above may exhibit the aberration characteristics shown in fig. 4. Tables 3 and 4 below each show lens characteristics and aspherical values of the imaging lens system according to the second embodiment.

TABLE 3 Table 3

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Table 4:

face number	S1	S2	S3	S4
					K	-0.427289636	-10.96366395	-6.51352873	-37.04127429
A	0.000135352	7.23892E-05	0.000529063	-8.64E-06
					B	-3.6135E-05	8.20897E-05	0.00016957	0.000303313
C	0	0	0	0
					D	0	0	0	0
E	0	0	0	0
					F	0	0	0	0
G	0	0	0	0
					H	0	0	0	0
J	0	0	0	0
					Face number	S5	S6	S7	S8
K	-10.76862408	-98.79646204	-94.95677185	-12.94419926
					A	0.003678668	0.001369146	0.001178011	0.004860345
B	0.000338754	0.000535777	0.000220387	-1.42782E-05
					C	0	0	0	0
D	0	0	0	0
					E	0	0	0	0
F	0	0	0	0
					G	0	0	0	0
H	0	0	0	0
					J	0	0	0	0

An exemplary imaging lens system according to a third embodiment will be described with reference to fig. 5.

The imaging lens system 300 according to the third embodiment may include a lens group LG and a prism P, which is one type of optical path conversion member. However, the components of the imaging lens system 300 are not limited to the above-described components. For example, the imaging lens system 300 may further include a filter IF and an imaging plane IP. The lens group LG and the prism P may be disposed sequentially from the object side to the imaging plane IP. In an example, the lens group LG may be disposed on the object side of the prism P, and the prism P may be disposed between the lens group LG and the imaging plane IP.

Next, the above-described components are described in order.

The lens group LG may include a plurality of lenses. For example, the lens group LG may include a first lens 310, a second lens 320, a third lens 330, and a fourth lens 340 disposed in order from the object side to the imaging plane IP. The first to fourth lenses 310 to 340 may be disposed at predetermined intervals. In a non-limiting example, the image side of the first lens element 310 may not be in contact with the object side of the second lens element 320, and the image side of the second lens element 320 may not be in contact with the object side of the third lens element 330. However, this is merely an example, and the first to fourth lenses 310 to 340 may not necessarily be spatially disposed apart from each other. In an example, the image side of the first lens 310 can be in contact with the object side of the second lens 320, and the image side of the second lens 320 can be in contact with the object side of the third lens 330.

Next, characteristics of the first lens 310 to the fourth lens 340 will be described.

The first lens 310 may have a positive refractive power, and may have a convex object side and a convex image side. The second lens 320 may have a negative refractive power, and may have a convex object side and a concave image side. The third lens 330 may have a negative refractive power, and may have a convex object side and a concave image side. The fourth lens 340 may have a negative refractive power, and may have a convex object side and a concave image side.

The filter IF may block light of a specific wavelength. In an example, the filter IF according to one or more embodiments may block infrared light. However, the type of light blocked by the filter IF is not limited to infrared light. In an example, the filter IF may block ultraviolet light or visible light.

The imaging lens system 300 configured as above may exhibit the aberration characteristics shown in fig. 6. Tables 5 and 6 below each show lens characteristics and aspherical values of the imaging lens system according to the third embodiment.

TABLE 5

Face number	Component part	Radius of curvature	Thickness/distance	Refractive index	Abbe number
						S1	First lens	5.229	1.001	1.498	81.6
S2		-46.247	0.148
						S3	Second lens	25.712	0.400	1.537	55.7
S4		15.826	0.300
						S5	Third lens	15.8359	0.400	1.537	55.7
S6		11.0379	0.145
						S7	Fourth lens	4.50157	0.800	1.644	23.5
S8		3.202	1.000
						S9	Prism	Infinity of infinity	2.500	1.518	64.2
S10		Infinity of infinity	11.500	1.518	64.2
						S11		Infinity of infinity	3.000	1.518	64.2
S12		Infinity of infinity	0.300
						S13	Optical filter	Infinity of infinity	0.210	1.518	64.2
S14		Infinity of infinity	0.297
						S15	Imaging surface	Infinity of infinity	0.004

TABLE 6

An exemplary imaging lens system according to a fourth embodiment will be described with reference to fig. 7.

The exemplary imaging lens system 400 according to the fourth embodiment may include a lens group LG and a prism P, which is one type of optical path conversion member. However, the components of the imaging lens system 400 are not limited to the above-described components. In an example, the imaging lens system 400 may further include a filter IF and an imaging plane IP. The lens group LG and the prism P may be disposed sequentially from the object side to the imaging plane IP. For example, the lens group LG may be disposed on the object side of the prism P, and the prism P may be disposed between the lens group LG and the imaging plane IP.

Next, the above-described components are described in order.

The lens group LG may include a plurality of lenses. In an example, the lens group LG may include a first lens 410, a second lens 420, a third lens 430, and a fourth lens 440 disposed in order from the object side to the imaging plane IP. The first to fourth lenses 410 to 440 may be disposed at predetermined intervals. In a non-limiting example, the image side of the first lens 410 may not be in contact with the object side of the second lens 420, and the image side of the second lens 420 may not be in contact with the object side of the third lens 430. However, the first to fourth lenses 410 to 440 may not necessarily be spatially disposed apart from each other. For example, the image side of the first lens 410 can be in contact with the object side of the second lens 420, and the image side of the second lens 420 can be in contact with the object side of the third lens 430.

Next, characteristics of the first lens 410 to the fourth lens 440 will be described.

The first lens 410 may have a positive refractive power, and may have a convex object side and a convex image side. The second lens 420 may have a negative refractive power and may have a convex object side and a concave image side. The third lens 430 may have positive refractive power and may have a convex object side and a concave image side. The fourth lens 440 may have a negative refractive power, and may have a convex object side and a concave image side.

The prism P may include a plurality of reflecting surfaces. In an example, the prism P may include a first reflective surface and a second reflective surface. The first reflective surface and the second reflective surface may be substantially parallel to each other. The first reflective surface and the second reflective surface may have a substantial distance therebetween. In an example, a distance from the first reflective surface to the second reflective surface may be greater than a height IMG HT of the imaging plane IP. In an example, the distance from the first reflective surface to the second reflective surface may be greater than four times the height IMG HT of the imaging plane IP.

The filter IF may block light of a specific wavelength. For example, the filter IF may block infrared light. However, the type of light blocked by the filter IF is not limited to infrared light. In an example, the filter IF may block ultraviolet light or visible light.

The imaging plane IP may be disposed at a point where light reflected from the prism P IS condensed or an image IS formed, and may be formed by an image sensor IS or the like. For example, the imaging plane IP may be formed on or inside the image sensor IS.

The exemplary imaging lens system 400 configured as above may exhibit the aberration characteristics shown in fig. 8. Tables 7 and 8 below each show lens characteristics and aspherical values of an exemplary imaging lens system according to the fourth embodiment.

TABLE 7

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TABLE 8

Face number	S1	S2	S3	S4
					K	0	0	0	0
A	0	0	0	0
					B	0	0	0	0
C	0	0	0	0
					D	0	0	0	0
E	0	0	0	0
					F	0	0	0	0
G	0	0	0	0
					H	0	0	0	0
J	0	0	0	0
					Face number	S5	S6	S7	S8
K	4.89320034	18.18801156	-1.511431563	-1.24492589
					A	0.002643782	0.004347627	0.003472447	0.004113889
B	-0.000224367	-0.0002907	0.0001343	0.000479743
					C	0	0	0	0
D	0	0	0	0
					E	0	0	0	0
F	0	0	0	0
					G	0	0	0	0
H	0	0	0	0
					J	0	0	0	0

An exemplary imaging lens system according to a fifth embodiment will be described with reference to fig. 9.

The exemplary imaging lens system 500 according to the fifth embodiment may include a lens group LG and a prism P, which is one type of optical path conversion member. However, the components of the imaging lens system 500 are not limited to the above-described components. In an example, the imaging lens system 500 may further include a filter IF and an imaging plane IP. The lens group LG and the prism P may be disposed sequentially from the object side to the imaging plane IP. In an example, the lens group LG may be disposed on the object side of the prism P, and the prism P may be disposed between the lens group LG and the imaging plane IP.

Next, the above-described components are described in order.

The lens group LG may include a plurality of lenses. For example, the lens group LG may include a first lens 510, a second lens 520, a third lens 530, and a fourth lens 540 disposed in order from the object side to the imaging plane IP. The first to fourth lenses 510 to 540 may be disposed at predetermined intervals. In an example, the image side of the first lens 510 may not be in contact with the object side of the second lens 520, and the image side of the second lens 520 may not be in contact with the object side of the third lens 530. However, the first to fourth lenses 510 to 540 may not necessarily be spatially disposed apart from each other. In an example, the image side of the first lens 510 can be in contact with the object side of the second lens 520, and the image side of the second lens 520 can be in contact with the object side of the third lens 530.

Next, characteristics of the first lens 510 to the fourth lens 540 will be described.

The first lens 510 may have a positive refractive power, and may have a convex object side and a convex image side. The second lens 520 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The third lens 530 may have a negative refractive power, and may have a convex object side and a concave image side. The fourth lens 540 may have a positive refractive power, and may have a convex object side and a concave image side.

The prism P may include a plurality of reflecting surfaces. For example, the prism P may include a first reflective surface and a second reflective surface. The first reflective surface and the second reflective surface may be substantially parallel to each other. The first reflective surface and the second reflective surface may have a substantial distance therebetween. In an example, a distance from the first reflective surface to the second reflective surface may be greater than a height IMG HT of the imaging plane IP. In another example, the distance from the first reflective surface to the second reflective surface may be greater than four times the height IMG HT of the imaging plane IP.

The filter IF may block light of a specific wavelength. In an example, the filter IF according to this embodiment may block infrared light. However, the type of light blocked by the filter IF is not limited to infrared light. In an example, the filter IF may block ultraviolet light or visible light.

The imaging lens system 500 configured as above may exhibit the aberration characteristics shown in fig. 10. Tables 9 and 10 below each show lens characteristics and aspherical values of the imaging lens system according to the present embodiment.

TABLE 9

Face number	Component part	Radius of curvature	Thickness/distance	Refractive index	Abbe number
						S1	First lens	3.920	1.248	1.537	55.7
S2		-20.796	0.100
						S3	Second lens	-16.640	0.866	1.537	55.7
S4		42.684	0.100
						S5	Third lens	8.24427	0.276	1.619	26.0
S6		3.09409	0.090
						S7	Fourth lens	3.13333	0.300	1.619	26.0
S8		3.65333	1.000
						S9	Prism	Infinity of infinity	2.500	1.518	64.2
S10		Infinity of infinity	11.500	1.518	64.2
						S11		Infinity of infinity	3.000	1.518	64.2
S12		Infinity of infinity	0.300
						S13	Optical filter	Infinity of infinity	0.210	1.518	64.2
S14		Infinity of infinity	0.174
						S15	Imaging surface	Infinity of infinity	0.012

Table 10

An exemplary imaging lens system according to a sixth embodiment will be described with reference to fig. 11.

The exemplary imaging lens system 600 according to the sixth embodiment may include a lens group LG and a prism P, which is one type of optical path conversion member. However, the components of the imaging lens system 600 are not limited to the above-described components. In an example, the imaging lens system 600 may further include a filter IF and an imaging plane IP. The lens group LG and the prism P may be disposed sequentially from the object side to the imaging plane IP. In an example, the lens group LG may be disposed on the object side of the prism P, and the prism P may be disposed between the lens group LG and the imaging plane IP.

Next, the above-described components are described in order.

The lens group LG may include a plurality of lenses. For example, the lens group LG may include a first lens 610, a second lens 620, a third lens 630, and a fourth lens 640 disposed in order from the object side to the imaging plane IP. The first to fourth lenses 610 to 640 may be disposed at predetermined intervals. In an example, the image side of the first lens 610 may not be in contact with the object side of the second lens 620, and the image side of the second lens 620 may not be in contact with the object side of the third lens 630. However, the first to fourth lenses 610 to 640 may not necessarily be spatially disposed apart from each other. In an example, the image side of the first lens 610 can be in contact with the object side of the second lens 620, and the image side of the second lens 620 can be in contact with the object side of the third lens 630.

Next, characteristics of the first lens 610 to the fourth lens 640 will be described.

The first lens 610 may have a positive refractive power and may have a convex object side and a concave image side. The second lens 620 may have a positive refractive power, and may have a convex object side and a concave image side. The third lens 630 may have positive refractive power, and may have a convex object side and a concave image side. The fourth lens 640 may have a negative refractive power, and may have a convex object side and a concave image side.

The filter IF may block light of a specific wavelength. In an example, the filter IF according to the present embodiment may block infrared light. However, the type of light blocked by the filter IF is not limited to infrared light. In an example, the filter IF may block ultraviolet light or visible light.

The imaging lens system 600 configured as above may exhibit the aberration characteristics shown in fig. 12. Tables 11 and 12 below each show lens characteristics and aspherical values of the imaging lens system according to the present embodiment.

TABLE 11

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Table 12

Face number	S1	S2	S3	S4
					K	0.344928349	0	0	-99
A	9.70164E-05	-1.76601E-05	2.55457E-05	-0.001531536
					B	2.73181E-05	-2.14958E-06	6.19014E-06	0.002042309
C	-4.91204E-06	-2.90562E-07	8.79374E-07	-0.000863204
					D	9.3407E-07	-8.86232E-09	6.91697E-08	0.000207981
E	-8.39693E-08	1.21392E-09	3.18914E-09	-2.99433E-05
					F	2.35343E-09	1.51258E-10	1.24428E-10	2.68181E-06
G	-5.10444E-11	-5.95195E-13	2.71575E-11	-1.43975E-07
					H	2.31185E-11	-1.48893E-12	6.20088E-12	3.15609E-09
J	-1.5758E-12	-1.59842E-13	8.88953E-13	7.55353E-11
					Face number	S5	S6	S7	S8
K	-1.17E+01	0	0	5.900E-01
					A	-2.948E-03	6.24731E-05	-0.000103984	-1.125E-03
B	2.041E-03	1.08429E-05	-1.15055E-05	-1.025E-03
					C	-6.022E-04	1.98602E-06	-1.68379E-06	1.389E-03
D	-1.099E-05	2.64153E-07	-2.29467E-07	-9.991E-04
					E	4.42323E-05	1.79879E-08	-2.61396E-08	0.00039859
F	-1.05033E-05	-3.00074E-09	-1.60817E-09	-9.29334E-05
					G	1.13117E-06	-1.53564E-09	1.86611E-10	1.25407E-05
H	-5.9262E-08	-4.38528E-10	-8.04452E-11	-9.0042E-07
					J	1.22222E-09	-1.07522E-10	-1.71932E-11	2.64504E-08

An exemplary imaging lens system according to a seventh embodiment will be described with reference to fig. 13.

The exemplary imaging lens system 700 according to the present embodiment may include a lens group LG and a prism P, which is one type of optical path conversion member. However, the components of the imaging lens system 700 are not limited to the above-described members. In an example, the imaging lens system 700 may further include a filter IF and an imaging plane IP. The lens group LG and the prism P may be disposed sequentially from the object side to the imaging plane IP. In an example, the lens group LG may be disposed on the object side of the prism P, and the prism P may be disposed between the lens group LG and the imaging plane IP.

Next, the above-described components are described in order.

The lens group LG may include a plurality of lenses. For example, the lens group LG may include a first lens 710, a second lens 720, a third lens 730, and a fourth lens 740 disposed in order from the object side to the imaging plane IP. The first to fourth lenses 710 to 740 may be disposed at predetermined intervals. For example, the image side of the first lens element 710 may not be in contact with the object side of the second lens element 720, and the image side of the second lens element 720 may not be in contact with the object side of the third lens element 730. However, the first to fourth lenses 710 to 740 may not necessarily be spatially disposed apart from each other. In an example, the image side of the first lens 710 can be in contact with the object side of the second lens 720, and the image side of the second lens 720 can be in contact with the object side of the third lens 730.

Next, characteristics of the first lens 710 to the fourth lens 740 will be described.

The first lens 710 may have a positive refractive power, and may have a convex object side and a concave image side. The second lens 720 may have a positive refractive power, and may have a convex object side and a concave image side. The third lens 730 may have positive refractive power and may have a convex object side and a concave image side. The fourth lens 740 may have a negative refractive power, and may have a convex object side and a concave image side.

The prism P may include a plurality of reflecting surfaces. In an example, the prism P may include a first reflective surface and a second reflective surface. The first reflective surface and the second reflective surface may be substantially parallel to each other. The first reflective surface and the second reflective surface may have a substantial distance therebetween. For example, a distance from the first reflective surface to the second reflective surface may be greater than a height IMG HT of the imaging plane IP. In another example, the distance from the first reflective surface to the second reflective surface may be greater than four times the height IMG HT of the imaging plane IP.

The imaging lens system 700 configured as above may exhibit the aberration characteristics shown in fig. 14. Tables 13 and 14 below each show lens characteristics and aspherical values of the imaging lens system according to the present embodiment.

TABLE 13

Face number	Component part	Radius of curvature	Thickness/distance	Refractive index	Abbe number
						S1	First lens	5.735	1.809	1.537	55.7
S2		25.245	0.100
						S3	Second lens	17.877	1.094	1.667	20.3
S4		28.068	0.100
						S5	Third lens	9.63366	0.756	1.537	55.7
S6		17.9257	0.128
						S7	Fourth lens	68.0174	0.350	1.619	26.0
S8		5.34746	1.200
						S9	Prism	Infinity of infinity	3.750	1.518	64.2
S10		Infinity of infinity	17.250	1.518	64.2
						S11		Infinity of infinity	4.500	1.518	64.2
S12		Infinity of infinity	0.500
						S13	Optical filter	Infinity of infinity	0.210	1.518	64.2
S14		Infinity of infinity	0.394
						S15	Imaging surface	Infinity of infinity	0.006

TABLE 14

An exemplary imaging lens system according to an eighth embodiment will be described with reference to fig. 15.

The imaging lens system 800 according to the eighth embodiment may include a lens group LG and a prism P, which is one type of optical path conversion member. However, the components of the imaging lens system 800 are not limited to the above-described components. For example, imaging lens system 800 may also include a filter IF and an imaging plane IP. The lens group LG and the prism P may be disposed sequentially from the object side to the imaging plane IP. In an example, the lens group LG may be disposed on the object side of the prism P, and the prism P may be disposed between the lens group LG and the imaging plane IP.

Next, the above-described components are described in order.

The lens group LG may include a plurality of lenses. For example, the lens group LG may include a first lens 810, a second lens 820, a third lens 830, and a fourth lens 840 disposed in order from the object side to the imaging plane IP. The first to fourth lenses 810 to 840 may be disposed at predetermined intervals. In an example, the image side of the first lens 810 may not be in contact with the object side of the second lens 820, and the image side of the second lens 820 may not be in contact with the object side of the third lens 830. However, the first lens 810 to the fourth lens 840 may not necessarily be spatially disposed apart from each other. In an example, the image side of the first lens 810 can be in contact with the object side of the second lens 820, and the image side of the second lens 820 can be in contact with the object side of the third lens 830.

Next, characteristics of the first lens 810 to the fourth lens 840 will be described.

The first lens 810 may have a positive refractive power, and may have a convex object side and a convex image side. The second lens 820 may have two surfaces that are flat in the paraxial region. However, the second lens 820 may have a predetermined shape in an edge region. For example, the image side of the second lens 820 may be concave in the edge region. The third lens 830 may have a negative refractive power, and may have a convex object side and a concave image side. The fourth lens 840 may have a negative refractive power, and may have a convex object side and a concave image side.

The exemplary imaging lens system 800 configured as above may exhibit the aberration characteristics shown in fig. 16. Tables 15 and 16 below each show lens characteristics and aspherical values of the imaging lens system according to the present embodiment.

TABLE 15

Face number	Component part	Radius of curvature	Thickness/distance	Refractive index	Abbe number
						S1	First lens	5.904	2.365	1.498	81.6
S2		-174.092	0.621
						S3	Second lens	Infinity of infinity	0.378	1.667	20.3
S4		Infinity of infinity	0.143
						S5	Third lens	12.1578	0.583	1.570	37.3
S6		6.34693	0.300
						S7	Fourth lens	10.1574	0.726	1.537	55.7
S8		6.01581	1.200
						S9	Prism	Infinity of infinity	3.750	1.518	64.2
S10		Infinity of infinity	17.250	1.518	64.2
						S11		Infinity of infinity	4.500	1.518	64.2
S12		Infinity of infinity	0.500
						S13	Optical filter	Infinity of infinity	0.210	1.518	64.2
S14		Infinity of infinity	0.396
						S15	Imaging surface	Infinity of infinity	0.006

Table 16

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Tables 17 to 19 below each show optical characteristic values and conditional expression values of exemplary imaging lens systems according to the first to eighth embodiments described above.

TABLE 17

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TABLE 18

Conditional expressions	First embodiment	Second embodiment	Third embodiment	Fourth embodiment
					f/f1	3.005	2.161	1.896	1.837
TTL/f	1.203	1.274	1.222	1.213
					PL/TTL	0.781	0.741	0.773	0.779
PD12/f	0.636	0.639	0.639	0.639
					Conditional expressions	Fifth embodiment	Sixth embodiment	Seventh embodiment	Eighth embodiment
f/f1	2.842	1.994	2.035	2.457
					TTL/f	1.219	1.187	1.179	1.164
PL/TTL	0.784	0.790	0.793	0.774
					PD12/f	0.647	0.634	0.633	0.610

TABLE 19

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Next, a modification of the exemplary imaging lens system will be described with reference to fig. 17.

Each of the exemplary imaging lens systems according to the first to eighth embodiments may further include an optical path conversion member, if necessary. For example, as shown in fig. 17, the exemplary imaging lens system 102 according to the modification may further include a prism PF provided on the object side of the lens group LG. The imaging lens system 102 configured as described above is advantageous in reducing the thickness of the camera module.

Next, an exemplary electronic device in accordance with one or more embodiments will be described with reference to fig. 18.

An exemplary electronic device according to one or more embodiments may include an imaging lens system according to an example. In an example, the electronic device may include one or more exemplary imaging lens systems according to the first to eighth embodiments. As a specific example, the electronic device may include the imaging lens system 100 according to the first embodiment.

An exemplary electronic device according to one or more embodiments may be a portable terminal 1000 as shown in fig. 18. However, the type of the electronic device is not limited to the portable terminal 1000. In an example, an electronic device in accordance with one or more embodiments may be a laptop computer merely as an example.

Exemplary portable terminal 1000 may include one or more camera modules 10 and 20. In a non-limiting example, two camera modules 10 and 20 may be installed in the main body 1002 of the portable terminal 1000 at predetermined intervals. In an example, the first camera module 10 and the second camera module 20 may photograph an object in the same direction. For example, the first camera module 10 and the second camera module 20 may be mounted on one surface of the portable terminal 1000.

At least one of the first camera module 10 and the second camera module 20 may include an exemplary imaging lens system according to one of the first to fourth embodiments. For example, the first camera module 10 may include the exemplary imaging lens system 100 according to the first embodiment.

In an example, the first camera module 10 may capture an image of an object disposed at a long distance. In other words, in an example, the focal length of the first camera module 10 may be greater than the focal length of the second camera module 20.

As described above, one or more examples may provide an imaging lens system that may be installed in a small-sized terminal or a slim-type terminal.

Additionally, one or more examples may provide a camera module having a tele-imaging lens system.

While this disclosure includes particular examples, it will be apparent to those skilled in the art after understanding the disclosure of this application 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 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 in a different order and/or if components in the described systems, architectures, devices or circuits are combined in a different manner and/or replaced or supplemented by other components or their equivalents.

Therefore, the scope of the present disclosure may be defined by the claims and their equivalents in addition to the above disclosure, and all modifications within the scope of the claims and their equivalents should be construed as being included in the present disclosure.

Claims

1. An imaging lens system comprising:

a first lens, a second lens, a third lens, a fourth lens, and an optical path conversion member disposed in order from the object side toward the imaging surface,

wherein 0.70< PL/TTL <0.90,

wherein PL is a distance from an incident surface of the light path conversion member to an exit surface of the light path conversion member, and TTL is a distance from an object side surface of the first lens to the imaging surface, and

wherein the imaging lens system has a total of four lenses.

2. The imaging lens system of claim 1 wherein said first lens has a convex object side.

3. The imaging lens system of claim 1 wherein said first lens has a convex image side.

4. The imaging lens system of claim 1 wherein said second lens has a concave object-side surface.

5. The imaging lens system of claim 1 wherein said second lens has a concave image side.

6. The imaging lens system of claim 1 wherein said third lens has a convex object side.

7. The imaging lens system of claim 1 wherein said third lens has a concave image side.

8. The imaging lens system of claim 1 wherein said fourth lens has a convex image side.

9. The imaging lens system of claim 1 wherein said fourth lens has a concave image side.

10. An imaging lens system comprising:

wherein 0.80< f/PL <1.20,

wherein PL is a distance from an incident surface of the light path conversion member to an exit surface of the light path conversion member, and f is a focal length of the imaging lens system, and

wherein the imaging lens system has a total of four lenses.

11. The imaging lens system of claim 10 wherein said first lens has positive refractive power.

12. The imaging lens system as claimed in claim 10, wherein,

3.0< f-number <5.0.

13. The imaging lens system as claimed in claim 10, wherein,

1.60<f/f1<3.20，

wherein f1 is the focal length of the first lens.

14. The imaging lens system as claimed in claim 10, wherein,

1.0<TTL/f<1.40，

wherein TTL is the distance from the object side surface of the first lens to the imaging surface.

15. The imaging lens system as claimed in claim 10, wherein,

0.40<(R1+R8)/PL<0.60，

wherein R1 is the radius of curvature of the object-side surface of the first lens and R8 is the radius of curvature of the image-side surface of the fourth lens.

16. The imaging lens system as claimed in claim 10, wherein,

0.10<IMG HT/PL<0.18，

wherein IMG HT is the height of the imaging plane.

17. The imaging lens system of claim 10 wherein said second lens has positive refractive power.