Imaging lens system, camera module, and electronic apparatus

Abstract

The present disclosure relates to an imaging lens system comprising: an optical path folding member comprising a foremost reflective surface disposed closest to an object side, a rearmost reflective surface disposed closest to an imaging plane, and a rearmost reflective surface disposed closest to an object side; and a rear reflective surface disposed at an acute angle with the last reflective surface and configured to reflect light reflected by the last reflective surface to the imaging plane; and a first lens group disposed on the object side of the foremost reflective surface or on the image side of the foremost reflective surface, in which an angle between a first virtual plane including the foremost reflective surface and a second virtual plane including the last reflective surface is 15 degrees to 27 degrees. The present disclosure also relates to a camera module comprising the imaging lens system and an electronic device comprising the camera module.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2021-0133480, filed on October 7, 2021, with the Korean Intellectual Property Office, and Korean Patent Application No. 10-2022-0043821, filed on April 8, 2022, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

[0003] This disclosure relates to a telephoto imaging lens system that can be mounted on a portable electronic device. Background Technology

[0004] Achieving an imaging lens system with a long focal length and reduced thickness and size (hereinafter referred to as a telephoto imaging lens system) can be challenging, and therefore such a system may be difficult to install in small terminals. However, the growing demand for functional and performance improvements in small terminals (e.g., smartphones) may lead to an increasing need for installing telephoto imaging lens systems in such small terminals.

[0005] The above information is presented as background information only to aid in understanding this disclosure. No determination or assertion is made as to whether any of the above content can be used as prior art with respect to this disclosure. Summary of the Invention

[0006] The summary portion of this invention is intended to provide a brief overview of the chosen inventive concepts, which will be further described in the detailed description portion below. This summary portion is not intended to identify key or essential features of the claimed subject matter, nor to help determine the scope of the claimed subject matter.

[0007] In one general aspect, the imaging lens system includes: an optical path folding member including a foremost reflecting surface, a last reflecting surface, and a rear reflecting surface, wherein the foremost reflecting surface is disposed closest to the object side, the last reflecting surface is disposed closest to the imaging surface, and the rear reflecting surface is disposed at an acute angle with the last reflecting surface and configured to reflect light reflected by the last reflecting surface to the imaging surface; and a first lens group disposed on the object side of the foremost reflecting surface or on the image side of the foremost reflecting surface, including an angle of 15 degrees to 27 degrees between a first virtual plane of the foremost reflecting surface and a second virtual plane including the last reflecting surface.

[0008] The first lens group may include a first lens and a second lens arranged sequentially from the object side.

[0009] The first lens can have positive refractive power, and the second lens can have negative refractive power.

[0010] V1-V2 can be greater than 30, where V1 is the Abbe number of the first lens and V2 is the Abbe number of the second lens.

[0011] The angle between the final reflecting surface and the back reflecting surface can be between 18 and 30 degrees.

[0012] The optical path folding component may further include a first optical path folding component and a second optical path folding component, wherein the first optical path folding component has a foremost reflecting surface and the second optical path folding component has a rear reflecting surface and a final reflecting surface.

[0013] The imaging lens system may also include a second lens group disposed on the object side or image side of the foremost reflecting surface, where the first lens group is not disposed.

[0014] The second lens group may include one or more lenses.

[0015] BFL / TTL can be less than 0.9, where BFL is the distance from the image side of the last lens in the first lens group to the imaging plane, and TTL is the distance from the object side of the first lens in the first lens group to the imaging plane.

[0016] The camera module may include an imaging lens system and an image sensor, wherein the imaging surface may be set on the image sensor.

[0017] The electronic device may include a camera module, wherein an image sensor is positioned diagonally relative to the thickness direction of the electronic device.

[0018] In another general aspect, the imaging lens system includes: a first optical path folding member having a reflective surface and a right-angled triangular cross-sectional shape; a second optical path folding member having two or more reflective surfaces and a right-angled triangular cross-sectional shape; a lens unit configured to face the incident or exit surface of the first optical path folding member; and an imaging surface configured to face the total internal reflection surface of the second optical path folding member, wherein the first optical path folding member, the second optical path folding member, and the imaging surface are arranged sequentially along the optical axis of the lens unit.

[0019] The second optical path folding member may include a first reflective surface that reflects light emitted from the first optical path folding member, and a second reflective surface that reflects light reflected from the first reflective surface back to the first reflective surface.

[0020] The angle between the first reflective surface and the second reflective surface can be between 16 degrees and 32 degrees.

[0021] The maximum length of the incident surface of the first optical path folding component can be less than the maximum length of the exit surface of the second optical path folding component.

[0022] The distance from the exit surface of the first optical path folding component to the incident surface of the second optical path folding component can be greater than the distance from the exit surface of the second optical path folding component to the imaging surface.

[0023] The lens unit may include a first lens group disposed on the object side of the first optical path folding member.

[0024] The lens unit may include a first lens group disposed between the first optical path folding member and the second optical path folding member.

[0025] The lens unit may include a first lens group disposed on the object side of the first optical path folding member, and a second lens group disposed between the first optical path folding member and the second optical path folding member.

[0026] The camera module may include an imaging lens system.

[0027] The electronic device may include a camera module, wherein the imaging surface may be disposed on an image sensor, and the image sensor may be disposed diagonally relative to the thickness direction of the electronic device.

[0028] In another general aspect, the imaging lens system includes: an optical path folding member comprising a first reflective surface, a second reflective surface, and a third reflective surface configured to sequentially reflect light incident from the object side; and a first lens group disposed on the object side or image side of the first reflective surface, wherein a first angle of incidence of the first reflective surface is smaller than a second angle of incidence of the second reflective surface, and a third angle of incidence of the third reflective surface is smaller than a first angle of incidence of the first reflective surface.

[0029] The first and second incident angles can be greater than the critical angles of the first and second reflecting surfaces, respectively, and the third incident angle can be less than the critical angle of the third reflecting surface.

[0030] The first and second angles of incidence can be greater than 36 degrees and less than 90 degrees, respectively.

[0031] The third angle of incidence can be greater than 28 degrees and less than 56 degrees.

[0032] The imaging surface can be set to face the second reflective surface.

[0033] The electronic device may include: a camera module, including an imaging lens system; and an image sensor, including an imaging surface configured to face the second reflective surface, wherein the image sensor may be diagonally positioned relative to the thickness direction of the electronic device.

[0034] In another general aspect, the imaging lens system includes: a first lens having positive refractive power; a second lens having negative refractive power, a convex object-side surface, and a concave image-side surface; a third lens having refractive power and a concave image-side surface; and a first reflective surface, a second reflective surface, and a third reflective surface arranged sequentially from the object side along the optical axis, wherein the first lens, the second lens, the third lens, the second reflective surface, and the third reflective surface are arranged sequentially from the object side along the optical axis.

[0035] The angle between the first virtual plane including the first reflective surface and the second virtual plane including the second reflective surface can be between 15 degrees and 27 degrees.

[0036] The imaging lens system may also include an imaging plane that is positioned along the optical axis and parallel to a virtual plane including a second reflective surface.

[0037] The first incident angle of the first reflecting surface may be less than the second incident angle of the second reflecting surface, and the third incident angle of the third reflecting surface may be less than the first incident angle of the first reflecting surface.

[0038] The imaging lens system may also include a fourth lens, which has refractive power and is disposed along the optical axis between the first reflective surface and the second reflective surface.

[0039] The imaging lens system may also include a fourth and a fifth reflecting surface disposed along the optical axis between the first and second reflecting surfaces.

[0040] The optical axis can be extended multiple times between the second and third reflecting surfaces.

[0041] The third lens can be positioned between the first and second reflecting surfaces along the optical axis.

[0042] The electronic device may include: a camera module, including an imaging lens system; and an image sensor, including an imaging surface configured to face the second reflective surface, wherein the image sensor may be diagonally positioned relative to the thickness direction of the electronic device.

[0043] Other features and aspects will become apparent from the appended claims, the accompanying drawings, and the detailed description below. Attached Figure Description

[0044] Figure 1 This is a diagram of an imaging lens system according to a first exemplary embodiment.

[0045] Figure 2 yes Figure 1 The aberration curves of the imaging lens system are shown.

[0046] Figure 3 yes Figure 1The diagram shows a modified example configuration of the imaging lens system.

[0047] Figure 4 yes Figure 1 A configuration diagram of another modified example of the imaging lens system shown.

[0048] Figure 5 This is a diagram of an imaging lens system according to a second exemplary embodiment.

[0049] Figure 6 yes Figure 5 The aberration curves of the imaging lens system are shown.

[0050] Figure 7 This is a diagram of an imaging lens system according to a third exemplary embodiment.

[0051] Figure 8 yes Figure 7 The aberration curves of the imaging lens system are shown.

[0052] Figure 9 yes Figure 7 The diagram shows a modified example configuration of the imaging lens system.

[0053] Figure 10 yes Figure 7 A configuration diagram of another modified example of the imaging lens system shown.

[0054] Figure 11 This is a diagram of an imaging lens system according to a fourth exemplary embodiment.

[0055] Figure 12 yes Figure 11 The aberration curves of the imaging lens system are shown.

[0056] Figure 13 This is a diagram of an imaging lens system according to a fifth exemplary embodiment.

[0057] Figure 14 yes Figure 13 The aberration curves of the imaging lens system are shown.

[0058] Figure 15 This is a diagram of an imaging lens system according to a sixth exemplary embodiment.

[0059] Figure 16 yes Figure 15 The aberration curves of the imaging lens system are shown.

[0060] Figure 17 This is a diagram of an imaging lens system according to a seventh exemplary embodiment.

[0061] Figure 18 yes Figure 17The aberration curves of the imaging lens system are shown.

[0062] Figure 19 This is a diagram of an imaging lens system according to an eighth exemplary embodiment.

[0063] Figure 20 yes Figure 19 The aberration curves of the imaging lens system are shown.

[0064] Figure 21 This is a perspective view of an electronic device according to an exemplary embodiment.

[0065] Figure 22 It is along Figure 21 The diagram shows a partial cross-sectional view of the electronic device taken by line II.

[0066] Throughout the accompanying drawings and detailed embodiments, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative dimensions, scale, and depiction of elements in the drawings may be exaggerated. Detailed Implementation

[0067] In the following description, while exemplary embodiments of the present disclosure will be illustrated, for example, with reference to the accompanying drawings, it should be noted that the exemplary embodiments are not limited thereto. The terms used to denote components of the present disclosure may be named in consideration of the function of each component. Therefore, these terms should not be construed as limiting technical components of the present disclosure.

[0068] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents to the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein, except for operations that must occur in a specific order, as will become apparent upon understanding this disclosure. Furthermore, for clarity and brevity, descriptions of features well-known in the art may be omitted.

[0069] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways in which the methods, apparatuses, and / or systems described herein will become apparent upon understanding this disclosure.

[0070] Throughout the disclosure, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "attached to" another element, the element may be directly "on," directly "connected to," or directly "attached to" the other element, or there may be one or more other elements between the element and the other element. Conversely, when an element is described as being "directly on," "directly connected to," or "directly attached to" another element, there are no other elements between the element and the other element.

[0071] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more of them; similarly, “at least one” includes any one of the associated listed items and any combination of any two or more of them.

[0072] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited by these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, the first component, first part, first region, first layer, or first section mentioned in these examples may also be referred to as a second component, second part, second region, second layer, or second section.

[0073] Spatial relative terms such as “above,” “above,” “below,” and “below” may be used herein for descriptive convenience to describe the relationship of one element relative to another, as shown in the accompanying drawings. In addition to covering the orientation depicted in the drawings, these spatial relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “above” another element would be located “below” or “below” that other element. Thus, depending on the spatial orientation of the device, the term “above” covers both orientations of “above” and “below”. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0074] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the articles “a,” “an,” and “the” are intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the stated features, numbers, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, components, elements, and / or combinations thereof.

[0075] Variations in the shapes shown in the figures may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the figures, but include shape variations that may occur during manufacturing.

[0076] It should be noted that in this document, the term "may" is used relative to examples, such as regarding what an example may include or implement, meaning that there exists at least one example that includes or implements such a feature, but not all examples are limited to this.

[0077] The features of the examples described herein can be combined in various ways that will become apparent upon understanding this disclosure. Furthermore, although the examples described herein have multiple configurations, other configurations that will become apparent upon understanding this disclosure are also possible.

[0078] One aspect of this disclosure provides a telephoto imaging lens system with a long focal length, which can be mounted in a small terminal.

[0079] In this disclosure, the first lens may indicate the lens closest to the object (or subject). Furthermore, the lens number may indicate the order in which the lenses are positioned from the object side along the optical axis. For example, the second lens may indicate the lens positioned at a second location from the object side, and the third lens may indicate the lens positioned at a third location from the object side. In this disclosure, the radius of curvature and thickness of the lens, TTL (i.e., the distance from the object side of the first lens to the imaging plane), 2IMG HT (i.e., the diagonal length of the imaging plane), IMG HT (i.e., the height of the imaging plane or half of 2IMG HT), and focal length may be expressed in millimeters (mm).

[0080] The lens thickness, the distance between lenses, the TTL (Time To Live), and the angle of incidence can all be dimensions calculated along the optical axis of the imaging lens system. Furthermore, in the description of the lens shape, a convex surface of the lens can indicate that the paraxial region of the corresponding surface is convex, and a concave surface of the lens can indicate that the paraxial region of the corresponding surface is concave. Therefore, even when describing a lens with one convex surface, the edge portion of the lens can be concave. Similarly, even when describing a lens with one concave surface, the edge portion of the lens can be convex.

[0081] The imaging lens system described herein can be installed in portable electronic devices. For example, it can be installed in smartphones, laptops, augmented reality devices, virtual reality devices, portable game consoles, etc. However, the scope and examples of use of the imaging lens system described herein are not limited to the aforementioned electronic devices. For instance, the imaging lens system can be applied to electronic devices that may require high-resolution imaging while providing a narrow mounting space.

[0082] The imaging lens system described herein can reduce the external size of the imaging lens system while ensuring a long back focal length (BFL, i.e., the distance from the image-side surface of the last lens to the imaging plane). For example, the imaging lens system of this disclosure can reduce the external size of the imaging lens system by using reflective elements while ensuring the BFL required to achieve a telephoto imaging lens system. In another example, the imaging lens system of this disclosure can provide an imaging plane with a relatively large size for achieving high resolution. In yet another example, the imaging lens system of this disclosure can have an integrated form that ensures both a long focal length and a long BFL when mounted in a portable terminal.

[0083] In this disclosure, the term "optical path folding member" can refer to any member that allows light to be reflected. For example, "optical path folding member" can collectively refer to all reflectors, prisms, etc. Therefore, in this disclosure, reflectors, prisms, and optical path folding members can all refer to the same or interchangeable components.

[0084] An imaging lens system according to a first exemplary embodiment of the present disclosure may include an optical path folding member and a first lens group. In the imaging lens system according to the first exemplary embodiment, the optical path folding member may include a plurality of reflective surfaces. For example, the optical path folding member may include a foremost reflective surface, a last reflective surface, and a rear reflective surface. The foremost reflective surface may be positioned closest to the object side, and the last reflective surface may be positioned closest to the imaging surface. The rear reflective surface may be positioned to form an acute angle with the last reflective surface and reflect light reflected by the last reflective surface to the imaging surface.

[0085] In the imaging lens system according to this exemplary embodiment, the first lens group may be disposed on the object side of the foremost reflecting surface or on the image side of the foremost reflecting surface. However, the first lens group is not limited to the above-described arrangement. The first lens group may include multiple lenses. For example, the first lens group may include a first lens and a second lens arranged sequentially from the object side. In the above-described arrangement, the first lens may have positive refractive power, and the second lens may have negative refractive power.

[0086] In the imaging lens system according to this exemplary embodiment, the reflective surfaces of the optical path folding members can have unique geometric relationships. For example, the angle between the foremost reflective surface and the last reflective surface can be 15 degrees to 27 degrees. In another example, the angle between a first virtual plane including the foremost reflective surface and a second virtual plane including the last reflective surface can be 15 degrees to 27 degrees. In yet another example, the angle between the last reflective surface and the rear reflective surface can be 18 degrees to 30 degrees.

[0087] The optical path folding component may include multiple components. For example, the optical path folding component may include a first optical path folding component having a foremost reflecting surface and a second optical path folding component having a rear reflecting surface and a final reflecting surface. The first and second optical path folding components may each have a prism shape. However, the first and second optical path folding components are not limited to a prism shape. For example, the first and second optical path folding components may each have a reflector shape.

[0088] An imaging lens system according to this exemplary embodiment may include multiple lens groups. For example, the imaging lens system may also include a second lens group disposed on the object side or image side of the foremost reflecting surface where the first lens group is not disposed. As a specific example, the imaging lens system may include a first lens group disposed on the object side of the foremost reflecting surface and a second lens group disposed on the image side of the foremost reflecting surface. The first lens group and the second lens group may each include one or more lenses. For example, the first lens group may include two lenses, and the second lens group may include one lens. In another example, the first lens group may include three lenses, and the second lens group may include two lenses. In yet another example, the first lens group may include two lenses, and the second lens group may include three lenses. However, the number of lenses included in the first lens group or the second lens group is not limited to the above-described numbers.

[0089] An imaging lens system according to a second exemplary embodiment of the present disclosure may include a first optical path folding member, a second optical path folding member, and an imaging surface arranged sequentially from the object side. In the imaging lens system according to the second exemplary embodiment, the first optical path folding member and the second optical path folding member may each have a right-angled triangular cross-sectional shape. For example, the first optical path folding member and the second optical path folding member may each be a prism with a right-angled triangular cross-sectional shape. The imaging lens system according to the second exemplary embodiment may also include a component for converging (or imaging) incident light onto the imaging surface. For example, the imaging lens system according to the second exemplary embodiment may also include a lens unit disposed facing the incident surface or exit surface of the first optical path folding member. In the imaging lens system according to the second exemplary embodiment, the imaging surface may be disposed on one side of the second optical path folding member. For example, the imaging surface may be disposed facing the hypotenuse (or total internal reflection surface) of the second optical path folding member.

[0090] The first and second optical path folding components may each include one or more reflective surfaces. For example, the first optical path folding component may have one reflective surface, and the second optical path folding component may have two or more reflective surfaces. As a specific example, the first optical path folding component may include a total internal reflection surface, and the second optical path folding component may include a total internal reflection surface and a specular reflection surface (or a specular reflection surface). The total internal reflection surface of the second optical path folding component can reflect light emitted from the first optical path folding component, and the specular reflection surface can reflect light emitted from the total internal reflection surface back to the total internal reflection surface (or imaging surface).

[0091] In the imaging lens system according to this exemplary embodiment, the second optical path folding member can have a unique shape. For example, the angle between the total internal reflection surface and the specular reflection surface of the second optical path folding member can be between 16 degrees and 32 degrees. As a specific example, the angle between the total internal reflection surface and the specular reflection surface of the second optical path folding member can be 30 degrees or 18 degrees.

[0092] In the imaging lens system according to this exemplary embodiment, the second optical path folding member can achieve multiple internal reflections. More specifically, the second optical path folding member can allow an even number of internal reflections. For example, the second optical path folding member can allow two or four internal reflections.

[0093] In the imaging lens system according to this exemplary embodiment, the angle (θP2) between the first reflective surface and the second reflective surface of the second optical path folding member can be represented by the following conditional expression.

[0094] θP2 = 90 / (2n+1), 2n = N

[0095] In the above conditional expression, "n" can represent a positive integer, and "N" can represent the number of internal reflections of the second optical path folding component. For example, when the number of internal reflections of the second optical path folding component is two, the angle (θP2) can be 30 degrees. In another example, when the number of internal reflections of the second optical path folding component is four, the angle (θP2) can be 18 degrees.

[0096] The number of internal reflections of the second optical path folding member according to this exemplary embodiment can be six or more. However, the number of internal reflections of the second optical path folding member can not exceed four. More specifically, when the number of internal reflections of the second optical path folding member increases to six or more, the angle (θP2) can decrease to 12.9 degrees or less. In this case, the amount of light incident on the second optical path folding member may also decrease, and the imaging lens system may therefore have a significantly reduced resolution. Therefore, the number of internal reflections of the second optical path folding member can be two or four.

[0097] In the imaging lens system according to this exemplary embodiment, the first optical path folding member and the second optical path folding member may have a unique dimensional relationship. For example, the maximum length of the incident surface of the first optical path folding member may be less than the maximum length of the exit surface of the second optical path folding member. In another example, the total internal reflection surface of the first optical path folding member may be less than the total internal reflection surface of the second optical path folding member.

[0098] In the imaging lens system according to this exemplary embodiment, the second optical path folding member may be disposed adjacent to the imaging surface. For example, the distance from the exit surface of the second optical path folding member to the imaging surface may be less than the distance from the exit surface of the first optical path folding member to the incident surface of the second optical path folding member.

[0099] In the imaging lens system according to this exemplary embodiment, the lens unit may include multiple lens groups. For example, the lens unit may include a first lens group disposed on the object side of the first optical path folding member and a second lens group disposed between the first optical path folding member and the second optical path folding member.

[0100] An imaging lens system according to a third exemplary embodiment of the present disclosure may include an optical path folding member and a first lens group. In the imaging lens system according to the present exemplary embodiment, the optical path folding member may include a unique configuration. For example, the optical path folding member may include a first reflective surface, a second reflective surface, and a third reflective surface that sequentially reflect light incident from the object side. Based on the angle of incidence, the first reflective surface, the second reflective surface, and the third reflective surface may have a predetermined dimensional relationship. For example, the first angle of incidence of the first reflective surface may be smaller than the second angle of incidence of the second reflective surface, and the third angle of incidence of the third reflective surface may be smaller than the first angle of incidence of the first reflective surface.

[0101] The first to third angles of incidence can each have a predetermined size. For example, the first and second angles of incidence can be greater than 36 degrees and less than 90 degrees, respectively. In another example, the third angle of incidence can be greater than 28 degrees and less than 56 degrees.

[0102] The imaging lens system according to this exemplary embodiment may have an imaging surface formed at a specific location. For example, in the imaging lens system according to this exemplary embodiment, the imaging surface may be configured to face the second reflective surface of the optical path folding member.

[0103] The imaging lens system according to the fourth exemplary embodiment of this disclosure can satisfy one or more of the following conditional expressions. However, it is not only the imaging lens system according to the fourth exemplary embodiment that can satisfy the following conditional expressions. For example, the imaging lens systems according to the first to third exemplary embodiments described above can satisfy one or more of the following conditional expressions.

[0104] BFL / TTL < 0.9

[0105] 30 < V1-V2

[0106] 10 mm < f

[0107] 15 mm < TTL

[0108] In the above conditional expressions, BFL can represent the distance from the image side of the lens closest to the imaging plane (hereinafter referred to as the last lens) to the imaging plane, TTL can represent the distance from the object side of the lens closest to the object (hereinafter referred to as the foremost lens or first lens) to the imaging plane, V1 can represent the Abbe number of the first lens (or foremost lens), V2 can represent the Abbe number of the second lens (or the lens closest to the image side of the first lens), and f is the focal length of the imaging lens system.

[0109] The imaging lens system according to this disclosure can satisfy the above conditional expression in a more limited form as follows.

[0110] 0.4 < BFL / TTL < 0.9

[0111] 30 < V1-V2 < 36

[0112] 12 mm < f < 24 mm

[0113] 15 mm < TTL < 26 mm

[0114] An imaging lens system according to a fifth exemplary embodiment of this disclosure may independently satisfy one or more of the following conditional expressions in addition to the above conditional expressions.

[0115] 0.8 < TTL / f < 1.5

[0116] 1.8 < TTL / f1 < 2.6

[0117] -3.4 < TTL / f2 < -0.2

[0118] -1.4 < TTL / f3 < 1.4

[0119] -1.0 < TTL / f4 < 1.0

[0120] 0.4 < BFL / f < 1.0

[0121] 0.9 < BFL / f1 < 2.1

[0122] -3.0 < BFL / f2 < -0.1

[0123] -1.0 < BFL / f3 < 1.0

[0124] -0.3 < BFL / f4 < 0.4

[0125] 5.0 mm < PID < 8.0 mm

[0126] 2.3 < PID / IMG HT < 6.0

[0127] In the above conditional expressions, f1 can represent the focal length of the first lens, f2 can represent the focal length of the second lens, f3 can represent the focal length of the lens closest to the image side of the second lens (hereinafter referred to as the third lens), f4 can represent the focal length of the lens closest to the image side of the third lens (hereinafter referred to as the fourth lens), PID can represent the optical path distance from the incident surface of the optical path folding member closest to the imaging plane to its exit surface, and IMG HT can represent the height of the imaging plane.

[0128] If desired, the imaging lens system according to the first to fourth exemplary embodiments may include one or more lenses having the following characteristics. For example, the imaging lens system according to the first exemplary embodiment may include one of the first to fourth lenses having the following characteristics. In another example, the imaging lens system according to the second exemplary embodiment may include two or more of the first to fourth lenses having the following characteristics. However, the imaging lens system according to the above exemplary embodiments may not necessarily include lenses having the following characteristics.

[0129] The first lens may have refractive 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 surface. The first lens may have a predetermined refractive index. For example, the refractive index of the first lens may be 1.5 or greater. As a specific example, the refractive index of the first lens may be greater than 1.5 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 greater. As a specific example, the Abbe number of the first lens may be greater than 52 and less than 62. 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 7.6 mm to 10.0 mm.

[0130] The second lens may have refractive power. For example, the second lens may have negative refractive power. The second lens may have a convex surface. For example, the second lens may have a convex object-side surface. The second lens may have a predetermined refractive index. For example, the refractive index of the second lens may be 1.6 or greater. As a specific example, the refractive index of the second lens may be greater than 1.6 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 greater. As a specific example, the Abbe number of the second lens may be greater than 20 and less than 30. The second lens may have a predetermined focal length. For example, the focal length of the second lens may be determined in the range of -60 mm to -6.0 mm.

[0131] The third lens may have refractive power. For example, the third lens may have positive or negative refractive power. The third lens may have a concave surface. For example, the third lens may have a concave image-side surface. The third lens may have a predetermined refractive index. For example, the refractive index of the third lens may be 1.5 or greater. As a specific example, the refractive index of the third lens may be greater than 1.5 and less than 1.7. The third lens may have a predetermined Abbe number. For example, the Abbe number of the third lens may be 18 or greater. As a specific example, the Abbe number of the third lens may be greater than 18 and less than 60. The third lens may have a predetermined focal length. For example, the focal length of the third lens may be less than -10 mm or greater than 10 mm.

[0132] The fourth lens may have 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 surface. The fourth lens may have a predetermined refractive index. For example, the refractive index of the fourth lens may be 1.5 or greater. As a specific example, the refractive index of the fourth lens may be greater than 1.5 and less than 1.6. The fourth lens may have a predetermined Abbe number. For example, the Abbe number of the fourth lens may be 50 or greater. As a specific example, the Abbe number of the fourth lens may be greater than 50 and less than 60. The fourth lens may have a predetermined focal length. For example, the focal length of the fourth lens may be less than -20 mm or greater than 20 mm.

[0133] The aspherical surfaces of the first to fourth lenses can be represented by Equation 1. In Equation 1, "c" can represent the reciprocal of the radius of curvature of the corresponding lens, "k" can represent the quadratic curve constant, "r" can represent the distance from a specific point on the aspherical surface of the lens to the optical axis, "A to H" and "J" can represent the aspherical constant, and "Z" (or SAG) can represent the height from a specific point on the aspherical surface of the lens to the vertex of the aspherical surface of the corresponding lens in the direction of the optical axis.

[0134] Equation 1

[0135] An electronic device according to a first exemplary embodiment of this disclosure may have a reduced thickness for ease of carrying or storage. For example, an electronic device according to an exemplary embodiment may be a smartphone, a laptop computer, etc. An electronic device according to an exemplary embodiment may include a camera module having a long focal length and capable of 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 fourth exemplary embodiments described above. However, the imaging lens system included in the camera module is not limited to the imaging lens systems according to the first to fourth exemplary embodiments described above.

[0136] An electronic device according to a second exemplary embodiment may include a camera module with a unique shape. For example, the camera module may include an image sensor configured to be tilted relative to the output unit (e.g., a liquid crystal display) of the electronic device. As a specific example, a plate on which the image sensor is mounted may be configured to be tilted at an angle of 16 to 32 degrees relative to the output unit of the electronic device.

[0137] In the following, exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings.

[0138] First, refer to Figure 1 An imaging lens system according to a first exemplary embodiment is described.

[0139] The imaging lens system 100 according to this exemplary embodiment may include a lens group LG, a first prism P1, and a second prism P2. 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 also include a filter IF and an imaging plane IP. The lens group LG, the first prism P1, and the second prism P2 may be arranged sequentially from the object side. For example, the lens group LG may be disposed on the object side of the first prism P1, and the second prism P2 may be disposed on the image side of the first prism P1. However, the lens group LG, the first prism P1, and the second prism P2 are not limited to the above arrangement. For example, the lens group LG may be disposed on the image side of the first prism P1, that is, between the first prism P1 and the second prism P2.

[0140] Next, the above components will be described in turn.

[0141] The lens group LG may include multiple lenses. For example, the lens group LG may include a first lens 110, a second lens 120, and a third lens 130 arranged sequentially from the object side. The first lens 110 to the third lens 130 may be arranged at predetermined intervals. For example, the image-side surface of the first lens 110 may not contact the object-side surface of the second lens 120, and the image-side surface of the second lens 120 may not contact the object-side surface of the third lens 130. However, the first lens 110 to the third lens 130 need not be arranged so that they do not contact each other. For example, the image-side surface of the first lens 110 may contact the object-side surface of the second lens 120, or the image-side surface of the second lens 120 may contact the object-side surface of the third lens 130.

[0142] Next, the characteristics of the first lens 110 to the third lens 130 will be described.

[0143] The first lens 110 may have refractive power. For example, the first lens 110 may have positive refractive power. The first lens 110 may have a convex object-side surface and a concave image-side surface. The first lens 110 may have a spherical surface. For example, both surfaces of the first lens 110 may be spherical. The second lens 120 may have refractive power. For example, the second lens 120 may have negative refractive power. The second lens 120 may have a convex object-side surface and a concave image-side surface. The second lens 120 may have an aspherical surface. For example, both surfaces of the second lens 120 may be aspherical. The third lens 130 may have refractive power. For example, the third lens 130 may have positive refractive power. The third lens 130 may have a convex object-side surface and a concave image-side surface. The third lens 130 may have an aspherical surface. For example, both surfaces of the third lens 130 may be aspherical.

[0144] Next, the first prism P1 and the second prism P2, serving as optical path folding components, will be described. For reference, the prisms described below are one type of optical path folding component described in the claims and may be changed to another component.

[0145] The first prism P1 and the second prism P2 can be configured such that light incident through the first lens 110 to the third lens 130 is imaged on the imaging surface IP. For example, the first prism P1 and the second prism P2 can be sequentially arranged along the optical path between the third lens 130 and the imaging surface IP.

[0146] The first prism P1 may have a triangular cross-section. For example, the cross-section cut by the first prism P1 in the optical path direction may have a right-angled triangular shape. The incident surface S7 and the projection surface S9 of the first prism P1 may form a generally right angle. For example, the incident surface S7 and the projection surface S9 of the first prism P1 may be formed in the portion of the right-angled triangular cross-section shape excluding the hypotenuse.

[0147] The first prism P1 may include a reflective surface. For example, the first prism P1 may include a first reflective surface S8. The first reflective surface S8 can achieve total internal reflection. For example, the first incident angle θ1 of the first reflective surface S8 may be greater than the critical angle of the first reflective surface S8. More specifically, the first incident angle θ1 may be 45 degrees, which is greater than 41.2 degrees (i.e., the critical angle of the first reflective surface S8). The first prism P1 configured as described above can reflect light incident from the third lens 130 to the second prism P2 as is.

[0148] The second prism P2 may have a triangular cross-section. For example, the cross-section cut by the second prism P2 in the optical path direction may have a right-angled triangular shape. The second prism P2 may include multiple reflective surfaces. For example, the second prism P2 may include a second reflective surface S11 and a third reflective surface S12.

[0149] The second prism P2 can achieve both total internal reflection and specular reflection. For example, the second reflecting surface S11 of the second prism P2 can achieve total internal reflection, and the third reflecting surface S12 of the second prism P2 can achieve either specular reflection or mirror reflection. As a specific example, the second incident angle θ2 of the second reflecting surface S11 can be greater than the critical angle of the second reflecting surface S11, and the third incident angle θ3 of the third reflecting surface S12 can be less than the critical angle of the third reflecting surface S12.

[0150] The second reflecting surface S11 and the third reflecting surface S12 can form an acute angle. For example, the angle θP2 between the second reflecting surface S11 and the third reflecting surface S12 can be from 16 degrees to 32 degrees. The second reflecting surface S11 and the third reflecting surface S12 can each have a predetermined angle with the incident surface S10 of the second prism P2. For example, the angle between the second reflecting surface S11 and the incident surface S10 of the second prism P2 can be from 58 degrees to 74 degrees, and the angle between the third reflecting surface S12 and the incident surface S10 of the second prism P2 can be approximately 90 degrees.

[0151] The second prism P2 can achieve multiple internal reflections. For example, light incident through the incident surface S10 of the second prism P2 can be reflected by the second reflecting surface S11, and then reflected again by the third reflecting surface S12.

[0152] One surface of the second prism P2 can both reflect and project light. For example, the second reflecting surface S11 of the second prism P2 can reflect light incident through the incident surface S10 to the third reflecting surface S12 while simultaneously transmitting light incident from the third reflecting surface S12.

[0153] The first reflecting surface S8, the second reflecting surface S11, and the third reflecting surface S12 of the first prism P1 and the second prism P2 can have a predetermined dimensional relationship. For example, the first incident angle θ1 can be smaller than the second incident angle θ2, and the third incident angle θ3 can be smaller than the first incident angle θ1.

[0154] The first prism P1 and the second prism P2 configured as described above can miniaturize and integrate the imaging lens system 100 by folding the optical path connected from the object side to the imaging plane IP. For example, the first prism P1 can fold the optical path extending along the first optical axis C1 in the direction of the second optical axis C2 intersecting the first optical axis C1, thereby reducing the length of the imaging lens system 100 in the direction of the first optical axis C1. In another example, the second prism P2 can fold the optical path extending along the second optical axis C2 two or more times through total internal reflection and specular reflection, thereby reducing the length of the imaging lens system 100 in the direction of the second optical axis C2.

[0155] The filter IF and the imaging surface IP can be disposed on one side of the second prism P2. For example, the filter IF and the imaging surface IP can be disposed facing the inclined side with the maximum length in the cross-sectional shape of the second prism P2. As a specific example, the filter IF and the imaging surface IP can be disposed facing the second reflective surface S11 of the second prism P2.

[0156] A filter IF can block light of a specific wavelength. For example, a filter IF according to this exemplary embodiment can block infrared light. However, the type of light blocked by the filter IF is not limited to infrared light. For example, a filter IF can block ultraviolet light or visible light.

[0157] The imaging surface IP can be located at the point where the light reflected by the third reflecting surface S12 converges or forms an image, and can be formed by an image sensor IS, etc. For example, the imaging surface IP can be formed on the image sensor IS or inside the image sensor IS.

[0158] The imaging lens system 100 configured as described above can display... Figure 2 The aberration characteristics are shown. Tables 1 and 2 respectively show the lens characteristics and aspherical values ​​of the imaging lens system according to this exemplary embodiment.

[0159] Table 1

[0160] Table 2

[0161] Next, refer to Figure 3 and Figure 4 This describes a modified example of the imaging lens system according to the first exemplary embodiment. For reference, in the following description, components identical to those in the above exemplary embodiments are indicated by the same reference numerals as those in the above exemplary embodiments, and detailed descriptions of these components are omitted.

[0162] First, refer to Figure 3 The imaging lens system 101 is described according to the first modified example.

[0163] The imaging lens system 101 according to the first modified example may include an optical path folding member P, in which a first prism and a second prism are configured as follows: Figure 3 They are integrally formed as shown. For example, the optical path folding component P can have... Figure 1 The first prism P1 and the second prism P2 are combined with each other.

[0164] The optical path folding component P may include three reflective surfaces. For example, the optical path folding component P may include a first reflective surface PS1, a second reflective surface PS2, and a third reflective surface PS3. The first reflective surface PS1, the second reflective surface PS2, and the third reflective surface PS3 may be arranged sequentially along the optical path.

[0165] The optical path folding component P can achieve both total internal reflection and specular reflection (or mirror reflection). For example, the first reflecting surface PS1 and the second reflecting surface PS2 can achieve total internal reflection, and the third reflecting surface PS3 can achieve specular reflection.

[0166] The first reflecting surface PS1, the second reflecting surface PS2, and the third reflecting surface PS3 can each have a predetermined incident angle. For example, the first incident angle θ1 of the first reflecting surface PS1 can be 45 degrees, the second incident angle θ2 of the second reflecting surface PS2 can be 60 degrees, and the third incident angle θ3 of the third reflecting surface PS3 can be 30 degrees.

[0167] The imaging lens system 101 configured as described above can use a single optical path folding member P to replace multiple prisms, thereby simplifying the assembly process of the imaging lens system 101.

[0168] Next, refer to Figure 4 The imaging lens system 102 is described according to the second modified example.

[0169] The imaging lens system 102 according to the second modified example can achieve a considerably long back focal length. For example, the imaging lens system 102 according to this modified example may include features that enable... Figure 4 The second prism P2 is shown to perform two or more internal reflections. As a specific example, the second prism P2 can achieve four internal reflections. For reference, the angle θP2 between the second reflecting surface S11 and the third reflecting surface S12 can be 18 degrees.

[0170] The imaging lens system 102 configured as described above can have an increased back focal length through multiple internal reflections achieved by the second prism P2 as described above, thereby improving the telephoto characteristics of the imaging lens system 102.

[0171] Next, refer to Figure 5 An imaging lens system according to a second exemplary embodiment is described.

[0172] The imaging lens system 200 according to this exemplary embodiment may include a lens group LG, a first prism P1, and a second prism P2. However, the components of the imaging lens system 200 are not limited to the above-described components. For example, the imaging lens system 200 may also include a filter IF and an imaging plane IP. The lens group LG, the first prism P1, and the second prism P2 may be arranged sequentially from the object side. For example, the lens group LG may be disposed on the object side of the first prism P1, and the second prism P2 may be disposed on the image side of the first prism P1. However, the lens group LG, the first prism P1, and the second prism P2 are not limited to the above arrangement. For example, the lens group LG may be disposed on the image side of the first prism P1, that is, between the first prism P1 and the second prism P2.

[0173] Next, the above components will be described in turn.

[0174] The lens group LG may include multiple lenses. For example, the lens group LG may include a first lens 210, a second lens 220, and a third lens 230 arranged sequentially from the object side. The first lens 210 to the third lens 230 may be arranged at predetermined intervals. For example, the image-side surface of the first lens 210 may not contact the object-side surface of the second lens 220, and the image-side surface of the second lens 220 may not contact the object-side surface of the third lens 230. However, the first lens 210 to the third lens 230 need not be arranged so that they do not contact each other. For example, the image-side surface of the first lens 210 may contact the object-side surface of the second lens 220, or the image-side surface of the second lens 220 may contact the object-side surface of the third lens 230.

[0175] Next, the characteristics of the first lens 210 to the third lens 230 will be described.

[0176] The first lens 210 may have refractive power. For example, the first lens 210 may have positive refractive power. The first lens 210 may have a convex object-side surface and a convex image-side surface. The first lens 210 may have a spherical surface. For example, both surfaces of the first lens 210 may be spherical. The second lens 220 may have refractive power. For example, the second lens 220 may have negative refractive power. The second lens 220 may have a convex object-side surface and a concave image-side surface. The second lens 220 may have an aspherical surface. For example, both surfaces of the second lens 220 may be aspherical. The third lens 230 may have refractive power. For example, the third lens 230 may have positive refractive power. The third lens 230 may have a convex object-side surface and a concave image-side surface. The third lens 230 may have an aspherical surface. For example, both surfaces of the third lens 230 may be aspherical.

[0177] Next, the first prism P1 and the second prism P2, serving as optical path folding components, will be described. For reference, the prisms described below are one type of optical path folding component described in the claims and may be changed to another component.

[0178] The first prism P1 and the second prism P2 can be configured such that light incident through the first lens 210 to the third lens 230 forms an image on the imaging surface IP. For example, the first prism P1 and the second prism P2 can be sequentially arranged along the optical path between the third lens 230 and the imaging surface IP.

[0179] The first prism P1 may have a triangular cross-section. For example, the cross-section cut by the first prism P1 in the optical path direction may have a right-angled triangular shape. The incident surface S7 and the projection surface S9 of the first prism P1 may form a generally right angle. For example, the incident surface S7 and the projection surface S9 of the first prism P1 may be formed in the portion of the right-angled triangular cross-section shape excluding the hypotenuse.

[0180] The first prism P1 may include a reflective surface. For example, the first prism P1 may include a first reflective surface S8. The first reflective surface S8 can achieve total internal reflection. For example, the first incident angle θ1 of the first reflective surface S8 may be greater than the critical angle of the first reflective surface S8. More specifically, the first incident angle θ1 may be 45 degrees, which is greater than 41.2 degrees (i.e., the critical angle of the first reflective surface S8). The first prism P1 configured as described above can reflect light incident from the third lens 230 to the second prism P2 as is.

[0181] The second prism P2 may have a triangular cross-section. For example, the cross-section cut by the second prism P2 in the optical path direction may have a right-angled triangular shape. The second prism P2 may include multiple reflective surfaces. For example, the second prism P2 may include a second reflective surface S11 and a third reflective surface S12.

[0182] The second prism P2 can achieve both total internal reflection and specular reflection. For example, the second reflecting surface S11 of the second prism P2 can achieve total internal reflection, and the third reflecting surface S12 of the second prism P2 can achieve either specular reflection or mirror reflection. As a specific example, the second incident angle θ2 of the second reflecting surface S11 can be greater than the critical angle of the second reflecting surface S11, and the third incident angle θ3 of the third reflecting surface S12 can be less than the critical angle of the third reflecting surface S12.

[0183] The second reflecting surface S11 and the third reflecting surface S12 can form an acute angle. For example, the angle θP2 between the second reflecting surface S11 and the third reflecting surface S12 can be from 16 degrees to 32 degrees. The second reflecting surface S11 and the third reflecting surface S12 can have a predetermined angle with the incident surface S10 of the second prism P2. For example, the angle between the second reflecting surface S11 and the incident surface S10 of the second prism P2 can be from 58 degrees to 74 degrees, and the angle between the third reflecting surface S12 and the incident surface S10 of the second prism P2 can be approximately 90 degrees.

[0184] The second prism P2 can achieve multiple internal reflections. For example, light incident through the incident surface S10 of the second prism P2 can be reflected by the second reflecting surface S11, and then reflected again by the third reflecting surface S12.

[0185] One surface of the second prism P2 can both reflect and project light. For example, the second reflecting surface S11 of the second prism P2 can reflect light incident through the incident surface S10 to the third reflecting surface S12 while simultaneously transmitting light incident from the third reflecting surface S12.

[0186] The first reflecting surface S8, the second reflecting surface S11, and the third reflecting surface S12 of the first prism P1 and the second prism P2 can have a predetermined dimensional relationship. For example, the first incident angle θ1 can be smaller than the second incident angle θ2, and the third incident angle θ3 can be smaller than the first incident angle θ1.

[0187] The first prism P1 and the second prism P2 configured as described above can miniaturize and integrate the imaging lens system 200 by folding the optical path connected from the object side to the imaging plane IP. For example, the first prism P1 can fold the optical path extending along the first optical axis C1 in the direction of the second optical axis C2 intersecting the first optical axis C1, thereby reducing the length of the imaging lens system 200 in the direction of the first optical axis C1. In another example, the second prism P2 can fold the optical path extending along the second optical axis C2 two or more times through total internal reflection and specular reflection, thereby reducing the length of the imaging lens system 200 in the direction of the second optical axis C2.

[0188] The imaging surface IP can be disposed on one side of the second prism P2. For example, the imaging surface IP can be disposed facing the inclined side with the maximum length in the cross-sectional shape of the second prism P2. As a specific example, the imaging surface IP can be disposed facing the second reflecting surface S11 of the second prism P2.

[0189] The imaging surface IP can be located at the point where the light reflected by the third reflecting surface S12 converges or forms an image, and can be formed by an image sensor IS, etc. For example, the imaging surface IP can be formed on or inside the image sensor IS.

[0190] In the imaging lens system 200 according to this exemplary embodiment, a filter (not shown) may be integrally formed on a surface of the second prism P2. For example, the filter may be integrally formed on the incident surface S10 or the projection surface S11 of the second prism P2. As a specific example, the filter may be manufactured in the shape of a film and attached to the incident surface S10 or the projection surface S11 of the second prism P2.

[0191] The imaging lens system 200 configured as described above can display... Figure 6 The aberration characteristics are shown. Tables 3 and 4 respectively show the lens characteristics and aspherical values ​​of the imaging lens system according to this exemplary embodiment.

[0192] Table 3

[0193] Table 4

[0194] Next, refer to Figure 7 An imaging lens system according to a third exemplary embodiment is described.

[0195] The imaging lens system 300 according to this exemplary embodiment may include a first lens group LG1, a first prism P1, a second lens group LG2, and a second prism P2. 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 also include a filter IF and an imaging plane IP. The first lens group LG1, the first prism P1, the second lens group LG2, and the second prism P2 may be arranged sequentially from the object side. For example, the first lens group LG1 may be disposed on the object side of the first prism P1, and the second lens group LG2 may be disposed between the first prism P1 and the second prism P2.

[0196] Next, the above components will be described in turn.

[0197] The first lens group LG1 may include multiple lenses. For example, the first lens group LG1 may include a first lens 310, a second lens 320, and a third lens 330 arranged sequentially from the object side. The first lens 310 to the third lens 330 may be arranged at predetermined intervals. For example, the image-side surface of the first lens 310 may not contact the object-side surface of the second lens 320, and the image-side surface of the second lens 320 may not contact the object-side surface of the third lens 330. However, the first lens 310 to the third lens 330 need not be arranged so that they do not contact each other. For example, the image-side surface of the first lens 310 may contact the object-side surface of the second lens 320, or the image-side surface of the second lens 320 may contact the object-side surface of the third lens 330.

[0198] The second lens group LG2 may include one or more lenses. For example, the second lens group LG2 may include a fourth lens 340. However, the lenses included in the second lens group LG2 are not limited to the fourth lens 340. For example, the second lens group LG2 may also include a lens or may include the filter IF described above.

[0199] Next, the characteristics of the first lens 310 to the fourth lens 340, which are included in the first lens group LG1 and the second lens group LG2, will be described.

[0200] The first lens 310 may have refractive power. For example, the first lens 310 may have positive refractive power. The first lens 310 may have a convex object-side surface and a convex image-side surface. The first lens 310 may have a spherical surface. For example, both surfaces of the first lens 310 may be spherical. The second lens 320 may have refractive power. For example, the second lens 320 may have negative refractive power. The second lens 320 may have a convex object-side surface and a concave image-side surface. The second lens 320 may have an aspherical surface. For example, both surfaces of the second lens 320 may be aspherical. The third lens 330 may have refractive power. For example, the third lens 330 may have positive refractive power. The third lens 330 may have a convex object-side surface and a concave image-side surface. The third lens 330 may have an aspherical surface. For example, both surfaces of the third lens 330 may be aspherical. The fourth lens 340 may have refractive power. For example, the fourth lens 340 may have positive refractive power. The fourth lens 340 may have a convex object-side surface and a convex image-side surface. The fourth lens 340 may have a spherical surface. For example, both surfaces of the fourth lens 340 may be spherical.

[0201] Next, the first prism P1 and the second prism P2, serving as optical path folding components, will be described. For reference, the prisms described below are one type of optical path folding component described in the claims and may be changed to another component.

[0202] The first prism P1 and the second prism P2 can be configured such that light incident through the first lens 310 to the fourth lens 340 forms an image on the imaging surface IP. For example, the first prism P1 and the second prism P2 can be sequentially arranged along the optical path between the third lens 330 and the imaging surface IP.

[0203] The first prism P1 may have a triangular cross-section. For example, the cross-section cut by the first prism P1 in the optical path direction may have a right-angled triangular shape. The incident surface S7 and the projection surface S9 of the first prism P1 may form a generally right angle. For example, the incident surface S7 and the projection surface S9 of the first prism P1 may be formed in the portion of the right-angled triangular cross-section shape excluding the hypotenuse.

[0204] The first prism P1 may include a reflective surface. For example, the first prism P1 may include a first reflective surface S8. The first reflective surface S8 can achieve total internal reflection. For example, the first incident angle θ1 of the first reflective surface S8 may be greater than the critical angle of the first reflective surface S8. More specifically, the first incident angle θ1 may be 45 degrees, which is greater than 41.2 degrees (i.e., the critical angle of the first reflective surface S8). The first prism P1 configured as described above can reflect light incident from the third lens 330 to the second prism P2 as is.

[0205] The second prism P2 may have a triangular cross-section. For example, the cross-section cut by the second prism P2 in the optical path direction may have a right-angled triangular shape. The second prism P2 may include multiple reflective surfaces. For example, the second prism P2 may include a second reflective surface S13 and a third reflective surface S14.

[0206] The second prism P2 can achieve both total internal reflection and specular reflection. For example, the second reflecting surface S13 of the second prism P2 can achieve total internal reflection, and the third reflecting surface S14 of the second prism P2 can achieve either specular reflection or mirror reflection. As a specific example, the second incident angle θ2 of the second reflecting surface S13 can be greater than the critical angle of the second reflecting surface S13, and the third incident angle θ3 of the third reflecting surface S14 can be less than the critical angle of the third reflecting surface S14.

[0207] The second reflecting surface S13 and the third reflecting surface S14 can form an acute angle. For example, the angle θP2 between the second reflecting surface S13 and the third reflecting surface S14 can be from 16 degrees to 32 degrees. The second reflecting surface S13 and the third reflecting surface S14 can have a predetermined angle with the incident surface S12 of the second prism P2. For example, the angle between the second reflecting surface S13 and the incident surface S12 of the second prism P2 can be from 58 degrees to 74 degrees, and the angle between the third reflecting surface S14 and the incident surface S12 of the second prism P2 can be approximately 90 degrees.

[0208] The second prism P2 can achieve multiple internal reflections. For example, light incident through the incident surface S12 of the second prism P2 can be reflected by the second reflecting surface S13, and then reflected again by the third reflecting surface S14.

[0209] One surface of the second prism P2 can both reflect and project light. For example, the second reflecting surface S13 of the second prism P2 can reflect light incident through the incident surface S12 to the third reflecting surface S14 while simultaneously transmitting light incident from the third reflecting surface S14.

[0210] The first reflecting surface S8, the second reflecting surface S13, and the third reflecting surface S14 of the first prism P1 and the second prism P2 can have a predetermined dimensional relationship. For example, the first incident angle θ1 can be smaller than the second incident angle θ2, and the third incident angle θ3 can be smaller than the first incident angle θ1.

[0211] The first prism P1 and the second prism P2 configured as described above can miniaturize and integrate the imaging lens system 300 by folding the optical path connected from the object side to the imaging plane IP. For example, the first prism P1 can fold the optical path extending along the first optical axis C1 in the direction of the second optical axis C2 intersecting the first optical axis C1, thereby reducing the length of the imaging lens system 300 in the direction of the first optical axis C1. In another example, the second prism P2 can fold the optical path extending along the second optical axis C2 two or more times through total internal reflection and specular reflection, thereby reducing the length of the imaging lens system 300 in the direction of the second optical axis C2.

[0212] The filter IF and the imaging surface IP can be disposed on one side of the second prism P2. For example, the filter IF and the imaging surface IP can be disposed facing the inclined side with the maximum length in the cross-sectional shape of the second prism P2. As a specific example, the filter IF and the imaging surface IP can be disposed facing the second reflective surface S13 of the second prism P2.

[0213] A filter IF can block light of a specific wavelength. For example, a filter IF according to this exemplary embodiment can block infrared light. However, the type of light blocked by the filter IF is not limited to infrared light. For example, a filter IF can block ultraviolet light or visible light.

[0214] The imaging surface IP can be located at the point where the light reflected by the third reflecting surface S14 converges or forms an image, and can be formed by an image sensor IS, etc. For example, the imaging surface IP can be formed on or inside the image sensor IS.

[0215] The imaging lens system 300 configured as described above can display... Figure 8 The aberration characteristics are shown. Tables 5 and 6 respectively show the lens characteristics and aspherical values ​​of the imaging lens system according to this exemplary embodiment.

[0216] Table 5

[0217] Table 6

[0218] Next, refer to Figure 9 and Figure 10 This describes a modified example of an imaging lens system according to a third exemplary embodiment. For reference, in the following description, components identical to those in the above exemplary embodiments are indicated by the same reference numerals as those in the above exemplary embodiments, and detailed descriptions of these components are omitted.

[0219] First, refer to Figure 9The imaging lens system 301 is described according to the first modified example.

[0220] The imaging lens system 301 according to the first modified example may also include a third prism P3. For example, the imaging lens system 301 may also include a third prism P3 disposed between the second lens group LG2 and the second prism P2.

[0221] The third prism P3 may include a reflective surface. For example, the third prism P3 may include a reflective surface P3SR. The reflective surface P3SR of the third prism P3 can achieve total internal reflection. For example, the angle of incidence of the reflective surface P3SR may be greater than the critical angle of the reflective surface P3SR. The third prism P3 may have a shape that is substantially the same as or similar to that of the first prism P1. However, the first prism P1 and the third prism P3 do not necessarily have to have the same or similar shapes.

[0222] The imaging lens system 301 configured as described above can achieve the desired effect without deforming the second prism P2. Figure 4 The shape shown has an easily extendable back focal length (BFL, i.e., the distance from the image side of the fourth lens 340 to the imaging plane IP).

[0223] Next, refer to Figure 10 The imaging lens system 302 is described according to the second modified example.

[0224] The imaging lens system 302 according to the second modified example may further include a third prism P3 and a fourth prism P4. For example, the imaging lens system 302 may also include a third prism P3 disposed between the first prism P1 and the second lens group LG2, and a fourth prism P4 disposed between the second lens group LG2 and the second prism P2.

[0225] The third prism P3 may include a reflective surface. For example, the third prism P3 may include a reflective surface P3SR. The reflective surface P3SR of the third prism P3 can achieve total internal reflection. For example, the angle of incidence of the reflective surface P3SR may be greater than the critical angle of the reflective surface P3SR. The third prism P3 may have a shape that is substantially the same as or similar to that of the first prism P1. However, the first prism P1 and the third prism P3 do not necessarily have to have the same or similar shapes.

[0226] The fourth prism P4 may include a reflective surface. For example, the fourth prism P4 may include a reflective surface P4SR. The reflective surface P4SR of the fourth prism P4 can achieve total internal reflection. For example, the angle of incidence of the reflective surface P4SR may be greater than the critical angle of the reflective surface P4SR. The fourth prism P4 may have a shape substantially the same as or similar to that of the first prism P1 or the third prism P3. However, the fourth prism P4 may not necessarily have a shape the same as or similar to that of the first prism P1 or the third prism P3.

[0227] The imaging lens system 302 configured as described above can have multiple lens groups LG1 and LG2 and imaging surface IP integrated in a limited space through multiple prisms P1, P2, P3 and P4, and can therefore be easily installed in electronic devices (e.g., portable terminals) with narrow installation space.

[0228] Next, refer to Figure 11 An imaging lens system according to a fourth exemplary embodiment is described.

[0229] The imaging lens system 400 according to this exemplary embodiment may include a first lens group LG1, a first prism P1, a second lens group LG2, and a second prism P2. However, the components of the imaging lens system 400 are not limited to the above-described components. For example, the imaging lens system 400 may also include a filter IF and an imaging plane IP. The first lens group LG1, the first prism P1, the second lens group LG2, and the second prism P2 may be arranged sequentially from the object side. For example, the first lens group LG1 may be disposed on the object side of the first prism P1, and the second lens group LG2 may be disposed between the first prism P1 and the second prism P2.

[0230] Next, the above components will be described in turn.

[0231] The first lens group LG1 may include multiple lenses. For example, the first lens group LG1 may include a first lens 410 and a second lens 420 arranged sequentially from the object side. The first lens 410 and the second lens 420 may be arranged at a predetermined interval. For example, the image-side surface of the first lens 410 may not be in contact with the object-side surface of the second lens 420. However, the first lens 410 and the second lens 420 do not necessarily have to be arranged so that they are not in contact with each other. For example, the image-side surface of the first lens 410 may be in contact with the object-side surface of the second lens 420.

[0232] The second lens group LG2 may include one or more lenses. For example, the second lens group LG2 may include a third lens 430. However, the lenses included in the second lens group LG2 are not limited to the third lens 430.

[0233] Next, the characteristics of the first lens 410 to the third lens 430 included in the first lens group LG1 and the second lens group LG2 will be described.

[0234] The first lens 410 may have refractive power. For example, the first lens 410 may have positive refractive power. The first lens 410 may have a convex object-side surface and a convex image-side surface. The first lens 410 may have a spherical surface. For example, both surfaces of the first lens 410 may be spherical. The second lens 420 may have refractive power. For example, the second lens 420 may have negative refractive power. The second lens 420 may have a convex object-side surface and a concave image-side surface. The second lens 420 may have an aspherical surface. For example, both surfaces of the second lens 420 may be aspherical. The third lens 430 may have refractive power. For example, the third lens 430 may have positive refractive power. The third lens 430 may have a convex object-side surface and a concave image-side surface. The third lens 430 may have both a spherical and an aspherical surface. For example, the object-side surface of the third lens 430 may be spherical, and the image-side surface of the third lens 430 may be aspherical.

[0235] Next, the first prism P1 and the second prism P2, serving as optical path folding components, will be described. For reference, the prisms described below are one type of optical path folding component described in the claims and may be changed to another component.

[0236] The first prism P1 and the second prism P2 can be configured such that light incident through the first lens 410 to the third lens 430 forms an image on the imaging surface IP. For example, the first prism P1 and the second prism P2 can be sequentially arranged along the optical path between the second lens 420 and the imaging surface IP.

[0237] The first prism P1 may have a triangular cross-section. For example, the cross-section cut by the first prism P1 in the optical path direction may have a right-angled triangle shape. The incident surface S5 and the projection surface S7 of the first prism P1 may form a generally right angle. For example, the incident surface S5 and the projection surface S7 of the first prism P1 may be formed in the portion of the right-angled triangle cross-section shape excluding the hypotenuse.

[0238] The first prism P1 may include a reflective surface. For example, the first prism P1 may include a first reflective surface S6. The first reflective surface S6 can achieve total internal reflection. For example, the first incident angle θ1 of the first reflective surface S6 may be greater than the critical angle of the first reflective surface S6. More specifically, the first incident angle θ1 may be 45 degrees, which is greater than 41.2 degrees (i.e., the critical angle of the first reflective surface S6). The first prism P1 configured as described above can reflect light incident from the second lens 420 to the third lens 430 and the second prism P2.

[0239] The second prism P2 may have a triangular cross-section. For example, the cross-section cut by the second prism P2 in the optical path direction may have a right-angled triangular shape. The second prism P2 may include multiple reflective surfaces. For example, the second prism P2 may include a second reflective surface S11 and a third reflective surface S12.

[0240] The second prism P2 can achieve both total internal reflection and specular reflection. For example, the second reflecting surface S11 of the second prism P2 can achieve total internal reflection, and the third reflecting surface S12 of the second prism P2 can achieve either specular reflection or mirror reflection. As a specific example, the second incident angle θ2 of the second reflecting surface S11 can be greater than the critical angle of the second reflecting surface S11, and the third incident angle θ3 of the third reflecting surface S12 can be less than the critical angle of the third reflecting surface S12.

[0241] The second reflecting surface S11 and the third reflecting surface S12 can form an acute angle. For example, the angle θP2 between the second reflecting surface S11 and the third reflecting surface S12 can be from 16 degrees to 32 degrees. The second reflecting surface S11 and the third reflecting surface S12 can have a predetermined angle with the incident surface S10 of the second prism P2. For example, the angle between the second reflecting surface S11 and the incident surface S10 of the second prism P2 can be from 58 degrees to 74 degrees, and the angle between the third reflecting surface S12 and the incident surface S10 of the second prism P2 can be approximately 90 degrees.

[0242] The second prism P2 can achieve multiple internal reflections. For example, light incident through the incident surface S10 of the second prism P2 can be reflected by the second reflecting surface S11, and then reflected again by the third reflecting surface S12.

[0243] One surface of the second prism P2 can both reflect and project light. For example, the second reflecting surface S11 of the second prism P2 can reflect light incident through the incident surface S10 to the third reflecting surface S12 while simultaneously transmitting light incident from the third reflecting surface S12.

[0244] The first reflecting surface S6, the second reflecting surface S11, and the third reflecting surface S12 of the first prism P1 and the second prism P2 can have a predetermined dimensional relationship. For example, the first incident angle θ1 can be smaller than the second incident angle θ2, and the third incident angle θ3 can be smaller than the first incident angle θ1.

[0245] The first prism P1 and the second prism P2 configured as described above can miniaturize and integrate the imaging lens system 400 by folding the optical path connected from the object side to the imaging plane IP. For example, the first prism P1 can fold the optical path extending along the first optical axis C1 in the direction of the second optical axis C2 intersecting the first optical axis C1, thereby reducing the length of the imaging lens system 400 in the direction of the first optical axis C1. In another example, the second prism P2 can fold the optical path extending along the second optical axis C2 two or more times through total internal reflection and specular reflection, thereby reducing the length of the imaging lens system 400 in the direction of the second optical axis C2.

[0246] The filter IF and the imaging surface IP can be disposed on one side of the second prism P2. For example, the filter IF and the imaging surface IP can be disposed facing the inclined side with the maximum length in the cross-sectional shape of the second prism P2. As a specific example, the filter IF and the imaging surface IP can be disposed facing the second reflective surface S11 of the second prism P2.

[0247] A filter IF can block light of a specific wavelength. For example, a filter IF according to this exemplary embodiment can block infrared light. However, the type of light blocked by the filter IF is not limited to infrared light. For example, a filter IF can block ultraviolet light or visible light.

[0248] The imaging surface IP can be located at the point where the light reflected by the third reflecting surface S12 converges or forms an image, and can be formed by an image sensor IS, etc. For example, the imaging surface IP can be formed on or inside the image sensor IS.

[0249] The imaging lens system 400 configured as described above can display... Figure 12 The aberration characteristics are shown. Tables 7 and 8 respectively show the lens characteristics and aspherical values ​​of the imaging lens system according to this exemplary embodiment.

[0250] Table 7

[0251] Table 8

[0252] Next, refer to Figure 13 An imaging lens system according to a fifth exemplary embodiment is described.

[0253] The imaging lens system 500 according to this exemplary embodiment may include a first lens group LG1, a first prism P1, a second lens group LG2, and a second prism P2. However, the components of the imaging lens system 500 are not limited to the above-described components. For example, the imaging lens system 500 may also include a filter IF and an imaging plane IP. The first lens group LG1, the first prism P1, the second lens group LG2, and the second prism P2 may be arranged sequentially from the object side. For example, the first lens group LG1 may be disposed on the object side of the first prism P1, and the second lens group LG2 may be disposed between the first prism P1 and the second prism P2.

[0254] Next, the above components will be described in turn.

[0255] The first lens group LG1 may include multiple lenses. For example, the first lens group LG1 may include a first lens 510 and a second lens 520 arranged sequentially from the object side. The first lens 510 and the second lens 520 may be arranged at a predetermined interval. For example, the image-side surface of the first lens 510 may not contact the object-side surface of the second lens 520. However, the first lens 510 and the second lens 520 do not necessarily have to be arranged so that they do not contact each other. For example, the image-side surface of the first lens 510 may contact the object-side surface of the second lens 520.

[0256] The second lens group LG2 may include one or more lenses. For example, the second lens group LG2 may include a third lens 530. However, the lenses included in the second lens group LG2 are not limited to the third lens 530.

[0257] Next, the characteristics of the first lens 510 to the third lens 530 included in the first lens group LG1 and the second lens group LG2 will be described.

[0258] The first lens 510 may have refractive power. For example, the first lens 510 may have positive refractive power. The first lens 510 may have a convex object-side surface and a convex image-side surface. The first lens 510 may have a spherical surface. For example, both surfaces of the first lens 510 may be spherical. The second lens 520 may have refractive power. For example, the second lens 520 may have negative refractive power. The second lens 520 may have a convex object-side surface and a concave image-side surface. The second lens 520 may have an aspherical surface. For example, both surfaces of the second lens 520 may be aspherical. The third lens 530 may have refractive power. For example, the third lens 530 may have negative refractive power. The third lens 530 may have a convex object-side surface and a concave image-side surface. The third lens 530 may have both a spherical and an aspherical surface. For example, the object-side surface of the third lens 530 may be spherical, and the image-side surface of the third lens 530 may be aspherical.

[0259] Next, the first prism P1 and the second prism P2, serving as optical path folding components, will be described. For reference, the prisms described below are one type of optical path folding component described in the claims and may be changed to another component.

[0260] The first prism P1 and the second prism P2 can be configured such that light incident through the first lens 510 to the third lens 530 forms an image on the imaging surface IP. For example, the first prism P1 and the second prism P2 can be sequentially arranged between the second lens 520 and the imaging surface IP along the optical path.

[0261] The first prism P1 may have a triangular cross-section. For example, the cross-section cut by the first prism P1 in the optical path direction may have a right-angled triangle shape. The incident surface S5 and the projection surface S7 of the first prism P1 may form a generally right angle. For example, the incident surface S5 and the projection surface S7 of the first prism P1 may be formed in the portion of the right-angled triangle cross-section shape excluding the hypotenuse.

[0262] The first prism P1 may include a reflective surface. For example, the first prism P1 may include a first reflective surface S6. The first reflective surface S6 can achieve total internal reflection. For example, the first incident angle θ1 of the first reflective surface S6 may be greater than the critical angle of the first reflective surface S6. More specifically, the first incident angle θ1 may be 45 degrees, which is greater than 41.2 degrees (i.e., the critical angle of the first reflective surface S6). The first prism P1 configured as described above can reflect light incident from the second lens 520 to the third lens 530 and the second prism P2.

[0263] The second prism P2 may have a triangular cross-section. For example, the cross-section cut by the second prism P2 in the optical path direction may have a right-angled triangular shape. The second prism P2 may include multiple reflective surfaces. For example, the second prism P2 may include a second reflective surface S11 and a third reflective surface S12.

[0264] The second prism P2 can achieve both total internal reflection and specular reflection. For example, the second reflecting surface S11 of the second prism P2 can achieve total internal reflection, and the third reflecting surface S12 of the second prism P2 can achieve either specular reflection or mirror reflection. As a specific example, the second incident angle θ2 of the second reflecting surface S11 can be greater than the critical angle of the second reflecting surface S11, and the third incident angle θ3 of the third reflecting surface S12 can be less than the critical angle of the third reflecting surface S12.

[0265] The second reflecting surface S11 and the third reflecting surface S12 can form an acute angle. For example, the angle θP2 between the second reflecting surface S11 and the third reflecting surface S12 can be from 16 degrees to 32 degrees. The second reflecting surface S11 and the third reflecting surface S12 can have a predetermined angle with the incident surface S10 of the second prism P2. For example, the angle between the second reflecting surface S11 and the incident surface S10 of the second prism P2 can be from 58 degrees to 74 degrees, and the angle between the third reflecting surface S12 and the incident surface S10 of the second prism P2 can be approximately 90 degrees.

[0266] The second prism P2 can achieve multiple internal reflections. For example, light incident through the incident surface S10 of the second prism P2 can be reflected by the second reflecting surface S11, and then reflected again by the third reflecting surface S12.

[0267] One surface of the second prism P2 can both reflect and project light. For example, the second reflecting surface S11 of the second prism P2 can reflect light incident through the incident surface S10 to the third reflecting surface S12 while simultaneously transmitting light incident from the third reflecting surface S12.

[0268] The first reflecting surface S6, the second reflecting surface S11, and the third reflecting surface S12 of the first prism P1 and the second prism P2 can have a predetermined dimensional relationship. For example, the first incident angle θ1 can be smaller than the second incident angle θ2, and the third incident angle θ3 can be smaller than the first incident angle θ1.

[0269] The first prism P1 and the second prism P2 configured as described above can miniaturize and integrate the imaging lens system 500 by folding the optical path connected from the object side to the imaging plane IP. For example, the first prism P1 can fold the optical path extending along the first optical axis C1 in the direction of the second optical axis C2 intersecting the first optical axis C1, thereby reducing the length of the imaging lens system 500 in the direction of the first optical axis C1. In another example, the second prism P2 can fold the optical path extending along the second optical axis C2 two or more times through total internal reflection and specular reflection, thereby reducing the length of the imaging lens system 500 in the direction of the second optical axis C2.

[0270] The filter IF and the imaging surface IP can be disposed on one side of the second prism P2. For example, the filter IF and the imaging surface IP can be disposed facing the inclined side with the maximum length in the cross-sectional shape of the second prism P2. As a specific example, the filter IF and the imaging surface IP can be disposed facing the second reflective surface S11 of the second prism P2.

[0271] A filter IF can block light of a specific wavelength. For example, a filter IF according to this exemplary embodiment can block infrared light. However, the type of light blocked by the filter IF is not limited to infrared light. For example, a filter IF can block ultraviolet light or visible light.

[0272] The imaging surface IP can be located at the point where the light reflected by the third reflecting surface S12 converges or forms an image, and can be formed by an image sensor IS, etc. For example, the imaging surface IP can be formed on or inside the image sensor IS.

[0273] The imaging lens system 500 configured as described above can display... Figure 14 The aberration characteristics are shown. Tables 9 and 10 respectively show the lens characteristics and aspherical values ​​of the imaging lens system according to this exemplary embodiment.

[0274] Table 9

[0275] Table 10

[0276] Next, refer to Figure 15 An imaging lens system according to a sixth exemplary embodiment is described.

[0277] The imaging lens system 600 according to this exemplary embodiment may include a first lens group LG1, a first prism P1, a second lens group LG2, and a second prism P2. However, the components of the imaging lens system 600 are not limited to the above-described components. For example, the imaging lens system 600 may also include a filter IF and an imaging plane IP. The first lens group LG1, the first prism P1, the second lens group LG2, and the second prism P2 may be arranged sequentially from the object side. For example, the first lens group LG1 may be disposed on the object side of the first prism P1, and the second lens group LG2 may be disposed between the first prism P1 and the second prism P2.

[0278] Next, the above components will be described in turn.

[0279] The first lens group LG1 may include multiple lenses. For example, the first lens group LG1 may include a first lens 610 and a second lens 620 arranged sequentially from the object side. The first lens 610 and the second lens 620 may be arranged at a predetermined interval. For example, the image-side surface of the first lens 610 may not contact the object-side surface of the second lens 620. However, the first lens 610 and the second lens 620 do not necessarily have to be arranged so that they do not contact each other. For example, the image-side surface of the first lens 610 may contact the object-side surface of the second lens 620.

[0280] The second lens group LG2 may include multiple lenses. For example, the second lens group LG2 may include a third lens 630 and a fourth lens 640 arranged sequentially from the object side. The third lens 630 and the fourth lens 640 may be arranged at a predetermined interval. For example, the image-side surface of the third lens 630 may not be in contact with the object-side surface of the fourth lens 640. However, the third lens 630 and the fourth lens 640 do not necessarily have to be arranged so that they are not in contact with each other. For example, the image-side surface of the third lens 630 may be in contact with the object-side surface of the fourth lens 640.

[0281] Next, the characteristics of the first lens 610 to the fourth lens 640, which are included in the first lens group LG1 and the second lens group LG2, will be described.

[0282] The first lens 610 may have refractive power. For example, the first lens 610 may have positive refractive power. The first lens 610 may have a convex object-side surface and a convex image-side surface. The first lens 610 may have a spherical surface. For example, both surfaces of the first lens 610 may be spherical. The second lens 620 may have refractive power. For example, the second lens 620 may have negative refractive power. The second lens 620 may have a convex object-side surface and a concave image-side surface. The second lens 620 may have an aspherical surface. For example, both surfaces of the second lens 620 may be aspherical. The third lens 630 may have refractive power. For example, the third lens 630 may have negative refractive power. The third lens 630 may have a concave object-side surface and a concave image-side surface. The third lens 630 may have a spherical surface. For example, both surfaces of the third lens 630 may be spherical. The fourth lens 640 may have refractive power. For example, the fourth lens 640 may have negative refractive power. The fourth lens 640 may have a convex object-side surface and a concave image-side surface. The fourth lens 640 may have aspherical surfaces. For example, both surfaces of the fourth lens 640 may be aspherical.

[0283] Next, the first prism P1 and the second prism P2, serving as optical path folding components, will be described. For reference, the prisms described below are one type of optical path folding component described in the claims and may be changed to another component.

[0284] The first prism P1 and the second prism P2 can be configured such that light incident through the first lens 610 to the fourth lens 640 forms an image on the imaging surface IP. For example, the first prism P1 and the second prism P2 can be sequentially arranged along the optical path between the second lens 620 and the imaging surface IP.

[0285] The first prism P1 may have a triangular cross-section. For example, the cross-section cut by the first prism P1 in the optical path direction may have a right-angled triangle shape. The incident surface S5 and the projection surface S7 of the first prism P1 may form a generally right angle. For example, the incident surface S5 and the projection surface S7 of the first prism P1 may be formed in the portion of the right-angled triangle cross-section shape excluding the hypotenuse.

[0286] The first prism P1 may include a reflective surface. For example, the first prism P1 may include a first reflective surface S6. The first reflective surface S6 can achieve total internal reflection. For example, the first incident angle θ1 of the first reflective surface S6 may be greater than the critical angle of the first reflective surface S6. More specifically, the first incident angle θ1 may be 45 degrees, which is greater than 41.2 degrees (i.e., the critical angle of the first reflective surface S6). The first prism P1 configured as described above can reflect light incident from the second lens 620 to the second prism P2.

[0287] The second prism P2 may have a triangular cross-section. For example, the cross-section cut by the second prism P2 in the optical path direction may have a right-angled triangular shape. The second prism P2 may include multiple reflective surfaces. For example, the second prism P2 may include a second reflective surface S13 and a third reflective surface S14.

[0288] The second prism P2 can achieve both total internal reflection and specular reflection. For example, the second reflecting surface S13 of the second prism P2 can achieve total internal reflection, and the third reflecting surface S14 of the second prism P2 can achieve either specular reflection or mirror reflection. As a specific example, the second incident angle θ2 of the second reflecting surface S13 can be greater than the critical angle of the second reflecting surface S13, and the third incident angle θ3 of the third reflecting surface S14 can be less than the critical angle of the third reflecting surface S14.

[0289] The second reflecting surface S13 and the third reflecting surface S14 can form an acute angle. For example, the angle θP2 between the second reflecting surface S13 and the third reflecting surface S14 can be from 16 degrees to 32 degrees. The second reflecting surface S13 and the third reflecting surface S14 can have a predetermined angle with the incident surface S12 of the second prism P2. For example, the angle between the second reflecting surface S13 and the incident surface S12 of the second prism P2 can be from 58 degrees to 74 degrees, and the angle between the third reflecting surface S14 and the incident surface S12 of the second prism P2 can be approximately 90 degrees.

[0290] The second prism P2 can achieve multiple internal reflections. For example, light incident through the incident surface S12 of the second prism P2 can be reflected by the second reflecting surface S13, and then reflected again by the third reflecting surface S14.

[0291] One surface of the second prism P2 can both reflect and project light. For example, the second reflecting surface S13 of the second prism P2 can reflect light incident through the incident surface S12 to the third reflecting surface S14 while simultaneously transmitting light incident from the third reflecting surface S14.

[0292] The first reflecting surface S6, the second reflecting surface S13, and the third reflecting surface S14 of the first prism P1 and the second prism P2 can have a predetermined dimensional relationship. For example, the first incident angle θ1 can be smaller than the second incident angle θ2, and the third incident angle θ3 can be smaller than the first incident angle θ1.

[0293] The first prism P1 and the second prism P2 configured as described above can miniaturize and integrate the imaging lens system 600 by folding the optical path connected from the object side to the imaging plane IP. For example, the first prism P1 can fold the optical path extending along the first optical axis C1 in the direction of the second optical axis C2 intersecting the first optical axis C1, thereby reducing the length of the imaging lens system 600 in the direction of the first optical axis C1. In another example, the second prism P2 can fold the optical path extending along the second optical axis C2 two or more times through total internal reflection and specular reflection, thereby reducing the length of the imaging lens system 600 in the direction of the second optical axis C2.

[0294] The filter IF and the imaging surface IP can be disposed on one side of the second prism P2. For example, the filter IF and the imaging surface IP can be disposed facing the inclined side with the maximum length in the cross-sectional shape of the second prism P2. As a specific example, the filter IF and the imaging surface IP can be disposed facing the second reflective surface S13 of the second prism P2.

[0295] A filter IF can block light of a specific wavelength. For example, a filter IF according to this exemplary embodiment can block infrared light. However, the type of light blocked by the filter IF is not limited to infrared light. For example, a filter IF can block ultraviolet light or visible light.

[0296] The imaging surface IP can be located at the point where the light reflected by the third reflecting surface S14 converges or forms an image, and can be formed by an image sensor IS, etc. For example, the imaging surface IP can be formed on or inside the image sensor IS.

[0297] The imaging lens system 600 configured as described above can be shown. Figure 16 The aberration characteristics are shown. Tables 11 and 12 respectively show the lens characteristics and aspherical values ​​of the imaging lens system according to this exemplary embodiment.

[0298] Table 11

[0299] Table 12

[0300] Next, refer to Figure 17 An imaging lens system according to a seventh exemplary embodiment is described.

[0301] The imaging lens system 700 according to this exemplary embodiment may include a first lens group LG1, a first prism P1, a second lens group LG2, and a second prism P2. However, the components of the imaging lens system 700 are not limited to the above-described components. For example, the imaging lens system 700 may also include a filter IF and an imaging plane IP. The first lens group LG1, the first prism P1, the second lens group LG2, and the second prism P2 may be arranged sequentially from the object side. For example, the first lens group LG1 may be disposed on the object side of the first prism P1, and the second lens group LG2 may be disposed between the first prism P1 and the second prism P2.

[0302] Next, the above components will be described in turn.

[0303] The first lens group LG1 may include multiple lenses. For example, the first lens group LG1 may include a first lens 710 and a second lens 720 arranged sequentially from the object side. The first lens 710 and the second lens 720 may be arranged at a predetermined interval. For example, the image-side surface of the first lens 710 may not be in contact with the object-side surface of the second lens 720. However, the first lens 710 and the second lens 720 do not necessarily have to be arranged so that they are not in contact with each other. For example, the image-side surface of the first lens 710 may be in contact with the object-side surface of the second lens 720.

[0304] The second lens group LG2 may include multiple lenses. For example, the second lens group LG2 may include a third lens 730 and a fourth lens 740 arranged sequentially from the object side. The third lens 730 and the fourth lens 740 may be arranged at a predetermined interval. For example, the image-side surface of the third lens 730 may not be in contact with the object-side surface of the fourth lens 740. However, the third lens 730 and the fourth lens 740 do not necessarily have to be arranged so that they are not in contact with each other. For example, the image-side surface of the third lens 730 may be in contact with the object-side surface of the fourth lens 740.

[0305] Next, the characteristics of the first lens 710 to the fourth lens 740, which are included in the first lens group LG1 and the second lens group LG2, will be described.

[0306] The first lens 710 may have refractive power. For example, the first lens 710 may have positive refractive power. The first lens 710 may have a convex object-side surface and a convex image-side surface. The first lens 710 may have an aspherical surface. For example, both surfaces of the first lens 710 may be aspherical. The second lens 720 may have refractive power. For example, the second lens 720 may have negative refractive power. The second lens 720 may have a convex object-side surface and a concave image-side surface. The second lens 720 may have an aspherical surface. For example, both surfaces of the second lens 720 may be aspherical. The third lens 730 may have refractive power. For example, the third lens 730 may have negative refractive power. The third lens 730 may have a convex object-side surface and a concave image-side surface. The third lens 730 may have a spherical surface. For example, both surfaces of the third lens 730 may be spherical. The fourth lens 740 may have refractive power. For example, the fourth lens 740 may have negative refractive power. The fourth lens 740 may have a convex object-side surface and a concave image-side surface. The fourth lens 740 may have aspherical surfaces. For example, both surfaces of the fourth lens 740 may be aspherical.

[0307] Next, the first prism P1 and the second prism P2, serving as optical path folding components, will be described. For reference, the prisms described below are one type of optical path folding component described in the claims and may be changed to another component.

[0308] The first prism P1 and the second prism P2 can be configured such that light incident through the first lens 710 to the fourth lens 740 is imaged on the imaging surface IP. For example, the first prism P1 and the second prism P2 can be sequentially arranged between the second lens 720 and the imaging surface IP along the optical path.

[0309] The first prism P1 may have a triangular cross-section. For example, the cross-section cut by the first prism P1 in the optical path direction may have a right-angled triangular shape. The incident surface S5 and the projection surface S7 of the first prism P1 may form a substantially right angle. For example, the incident surface S5 and the projection surface S7 of the first prism P1 may be formed in the portion of the right-angled triangular cross-section shape excluding the hypotenuse.

[0310] The first prism P1 may include a reflective surface. For example, the first prism P1 may include a first reflective surface S6. The first reflective surface S6 can achieve total internal reflection. For example, the first incident angle θ1 of the first reflective surface S6 may be greater than the critical angle of the first reflective surface S6. More specifically, the first incident angle θ1 may be 45 degrees, which is greater than 41.2 degrees (i.e., the critical angle of the first reflective surface S6). The first prism P1 configured as described above can reflect light incident from the second lens 720 to the second prism P2.

[0311] The second prism P2 may have a triangular cross-section. For example, the cross-section cut by the second prism P2 in the optical path direction may have a right-angled triangular shape. The second prism P2 may include multiple reflective surfaces. For example, the second prism P2 may include a second reflective surface S13 and a third reflective surface S14.

[0312] The second prism P2 can achieve both total internal reflection and specular reflection. For example, the second reflecting surface S13 of the second prism P2 can achieve total internal reflection, and the third reflecting surface S14 of the second prism P2 can achieve either specular reflection or mirror reflection. As a specific example, the second incident angle θ2 of the second reflecting surface S13 can be greater than the critical angle of the second reflecting surface S13, and the third incident angle θ3 of the third reflecting surface S14 can be less than the critical angle of the third reflecting surface S14.

[0313] The second reflecting surface S13 and the third reflecting surface S14 can form an acute angle. For example, the angle θP2 between the second reflecting surface S13 and the third reflecting surface S14 can be from 16 degrees to 32 degrees. The second reflecting surface S13 and the third reflecting surface S14 can have a predetermined angle with the incident surface S12 of the second prism P2. For example, the angle between the second reflecting surface S13 and the incident surface S12 of the second prism P2 can be from 58 degrees to 74 degrees, and the angle between the third reflecting surface S14 and the incident surface S12 of the second prism P2 can be approximately 90 degrees.

[0314] The second prism P2 can achieve multiple internal reflections. For example, light incident through the incident surface S12 of the second prism P2 can be reflected by the second reflecting surface S13, and then reflected again by the third reflecting surface S14.

[0315] One surface of the second prism P2 can both reflect and project light. For example, the second reflecting surface S13 of the second prism P2 can reflect light incident through the incident surface S12 to the third reflecting surface S14 while simultaneously transmitting light incident from the third reflecting surface S14.

[0316] The first reflecting surface S6, the second reflecting surface S13, and the third reflecting surface S14 of the first prism P1 and the second prism P2 can have a predetermined dimensional relationship. For example, the first incident angle θ1 can be smaller than the second incident angle θ2, and the third incident angle θ3 can be smaller than the first incident angle θ1.

[0317] The first prism P1 and the second prism P2 configured as described above can miniaturize and integrate the imaging lens system 700 by folding the optical path connected from the object side to the imaging plane IP. For example, the first prism P1 can fold the optical path extending along the first optical axis C1 in the direction of the second optical axis C2 intersecting the first optical axis C1, thereby reducing the length of the imaging lens system 700 in the direction of the first optical axis C1. In another example, the second prism P2 can fold the optical path extending along the second optical axis C2 two or more times through total internal reflection and specular reflection, thereby reducing the length of the imaging lens system 700 in the direction of the second optical axis C2.

[0318] The filter IF and the imaging surface IP can be disposed on one side of the second prism P2. For example, the filter IF and the imaging surface IP can be disposed facing the inclined side with the maximum length in the cross-sectional shape of the second prism P2. As a specific example, the filter IF and the imaging surface IP can be disposed facing the second reflective surface S13 of the second prism P2.

[0319] A filter IF can block light of a specific wavelength. For example, a filter IF according to this exemplary embodiment can block infrared light. However, the type of light blocked by the filter IF is not limited to infrared light. For example, a filter IF can block ultraviolet light or visible light.

[0320] The imaging surface IP can be located at the point where the light reflected by the third reflecting surface S14 converges or forms an image, and can be formed by an image sensor IS, etc. For example, the imaging surface IP can be formed on or inside the image sensor IS.

[0321] The imaging lens system 700 configured as described above can display... Figure 18 The aberration characteristics are shown. Tables 13 and 14 respectively show the lens characteristics and aspherical values ​​of the imaging lens system according to this exemplary embodiment.

[0322] Table 13

[0323] Table 14

[0324] Next, refer to Figure 19 An imaging lens system according to an eighth exemplary embodiment is described.

[0325] The imaging lens system 800 according to this exemplary embodiment may include a first lens group LG1, a first prism P1, a second lens group LG2, and a second prism P2. However, the components of the imaging lens system 800 are not limited to the above-described components. For example, the imaging lens system 800 may also include a filter IF and an imaging plane IP. The first lens group LG1, the first prism P1, the second lens group LG2, and the second prism P2 may be arranged sequentially from the object side. For example, the first lens group LG1 may be disposed on the object side of the first prism P1, and the second lens group LG2 may be disposed between the first prism P1 and the second prism P2.

[0326] Next, the above components will be described in turn.

[0327] The first lens group LG1 may include multiple lenses. For example, the first lens group LG1 may include a first lens 810 and a second lens 820 arranged sequentially from the object side. The first lens 810 and the second lens 820 may be arranged at a predetermined interval. For example, the image-side surface of the first lens 810 may not be in contact with the object-side surface of the second lens 820. However, the first lens 810 and the second lens 820 do not necessarily have to be arranged so that they are not in contact with each other. For example, the image-side surface of the first lens 810 may be in contact with the object-side surface of the second lens 820.

[0328] The second lens group LG2 may include multiple lenses. For example, the second lens group LG2 may include a third lens 830 and a fourth lens 840 arranged sequentially from the object side. The third lens 830 and the fourth lens 840 may be arranged at a predetermined interval. For example, the image-side surface of the third lens 830 may not be in contact with the object-side surface of the fourth lens 840. However, the third lens 830 and the fourth lens 840 do not necessarily have to be arranged so that they are not in contact with each other. For example, the image-side surface of the third lens 830 may be in contact with the object-side surface of the fourth lens 840.

[0329] Next, the characteristics of the first lens 810 to the fourth lens 840, which are included in the first lens group LG1 and the second lens group LG2, will be described.

[0330] The first lens 810 may have refractive power. For example, the first lens 810 may have positive refractive power. The first lens 810 may have a convex object-side surface and a convex image-side surface. The first lens 810 may have a spherical surface and an aspherical surface. For example, the object-side surface of the first lens 810 may be spherical, and the image-side surface of the first lens 810 may be aspherical. The second lens 820 may have refractive power. For example, the second lens 820 may have negative refractive power. The second lens 820 may have a convex object-side surface and a concave image-side surface. The second lens 820 may have an aspherical surface. For example, both surfaces of the second lens 820 may be aspherical. The third lens 830 may have refractive power. For example, the third lens 830 may have negative refractive power. The third lens 830 may have a convex object-side surface and a concave image-side surface. The third lens 830 may have an aspherical surface. For example, both surfaces of the third lens 830 may be aspherical. The fourth lens 840 may have refractive power. For example, the fourth lens 840 can have positive refractive power. The fourth lens 840 can have a convex object-side surface and a concave image-side surface. The fourth lens 840 can have an aspherical surface. For example, both surfaces of the fourth lens 840 can be aspherical.

[0331] Next, the first prism P1 and the second prism P2, serving as optical path folding components, will be described. For reference, the prisms described below are one type of optical path folding component described in the claims, and may be modified to another type.

[0332] The first prism P1 and the second prism P2 can be configured such that light incident through the first lens 810 to the fourth lens 840 forms an image on the imaging surface IP. For example, the first prism P1 and the second prism P2 can be sequentially arranged along the optical path between the second lens 820 and the imaging surface IP.

[0333] The first prism P1 may have a triangular cross-section. For example, the cross-section cut by the first prism P1 in the optical path direction may have a right-angled triangle shape. The incident surface S5 and the projection surface S7 of the first prism P1 may form a generally right angle. For example, the incident surface S5 and the projection surface S7 of the first prism P1 may be formed in the portion of the right-angled triangle cross-section shape excluding the hypotenuse.

[0334] The first prism P1 may include a reflective surface. For example, the first prism P1 may include a first reflective surface S6. The first reflective surface S6 can achieve total internal reflection. For example, the first incident angle θ1 of the first reflective surface S6 may be greater than the critical angle of the first reflective surface S6. More specifically, the first incident angle θ1 may be 45 degrees, which is greater than 41.2 degrees (i.e., the critical angle of the first reflective surface S6). The first prism P1 configured as described above can reflect light incident from the second lens 820 to the second prism P2.

[0335] The second prism P2 may have a triangular cross-section. For example, the cross-section cut by the second prism P2 in the optical path direction may have a right-angled triangular shape. The second prism P2 may include multiple reflective surfaces. For example, the second prism P2 may include a second reflective surface S13 and a third reflective surface S14.

[0336] The second prism P2 can achieve both total internal reflection and specular reflection. For example, the second reflecting surface S13 of the second prism P2 can achieve total internal reflection, and the third reflecting surface S14 of the second prism P2 can achieve either specular reflection or mirror reflection. As a specific example, the second incident angle θ2 of the second reflecting surface S13 can be greater than the critical angle of the second reflecting surface S13, and the third incident angle θ3 of the third reflecting surface S14 can be less than the critical angle of the third reflecting surface S14.

[0337] The second reflecting surface S13 and the third reflecting surface S14 can form an acute angle. For example, the angle θP2 between the second reflecting surface S13 and the third reflecting surface S14 can be from 16 degrees to 32 degrees. The second reflecting surface S13 and the third reflecting surface S14 can have a predetermined angle with the incident surface S12 of the second prism P2. For example, the angle between the second reflecting surface S13 and the incident surface S12 of the second prism P2 can be from 58 degrees to 74 degrees, and the angle between the third reflecting surface S14 and the incident surface S12 of the second prism P2 can be approximately 90 degrees.

[0338] The second prism P2 can achieve multiple internal reflections. For example, light incident through the incident surface S12 of the second prism P2 can be reflected by the second reflecting surface S13, and then reflected again by the third reflecting surface S14.

[0339] One surface of the second prism P2 can both reflect and project light. For example, the second reflecting surface S13 of the second prism P2 can reflect light incident through the incident surface S12 to the third reflecting surface S14 while simultaneously transmitting light incident from the third reflecting surface S14.

[0340] The first reflecting surface S6, the second reflecting surface S13, and the third reflecting surface S14 of the first prism P1 and the second prism P2 can have a predetermined dimensional relationship. For example, the first incident angle θ1 can be smaller than the second incident angle θ2, and the third incident angle θ3 can be smaller than the first incident angle θ1.

[0341] The first prism P1 and the second prism P2 configured as described above can miniaturize and integrate the imaging lens system 800 by folding the optical path connected from the object side to the imaging plane IP. For example, the first prism P1 can fold the optical path extending along the first optical axis C1 in the direction of the second optical axis C2 intersecting the first optical axis C1, thereby reducing the length of the imaging lens system 800 in the direction of the first optical axis C1. In another example, the second prism P2 can fold the optical path extending along the second optical axis C2 two or more times through total internal reflection and specular reflection, thereby reducing the length of the imaging lens system 800 in the direction of the second optical axis C2.

[0342] The filter IF and the imaging surface IP can be disposed on one side of the second prism P2. For example, the filter IF and the imaging surface IP can be disposed facing the inclined side with the maximum length in the cross-sectional shape of the second prism P2. As a specific example, the filter IF and the imaging surface IP can be disposed facing the second reflective surface S13 of the second prism P2.

[0343] A filter IF can block light of a specific wavelength. For example, a filter IF according to this exemplary embodiment can block infrared light. However, the type of light blocked by the filter IF is not limited to infrared light. For example, a filter IF can block ultraviolet light or visible light.

[0344] The imaging surface IP can be located at the point where the light reflected by the third reflecting surface S14 converges or forms an image, and can be formed by an image sensor IS, etc. For example, the imaging surface IP can be formed on or inside the image sensor IS.

[0345] The imaging lens system 800 configured as described above can display... Figure 20 The aberration characteristics are shown. Tables 15 and 16 respectively show the lens characteristics and aspherical values ​​of the imaging lens system according to this exemplary embodiment.

[0346] Table 15

[0347] Table 16

[0348] Tables 17 and 18 respectively show the optical characteristic values ​​and conditional expression values ​​of the imaging lens systems according to the first exemplary embodiment to the eighth exemplary embodiment described above.

[0349] Table 17

[0350] Table 18

[0351] Next, an electronic device according to this disclosure will be described.

[0352] An electronic device according to this disclosure may include an imaging lens system according to an exemplary embodiment. For example, the electronic device may include one or more imaging lens systems according to a first exemplary embodiment to an eighth exemplary embodiment. As a specific example, the electronic device may include an imaging lens system 100 according to a first exemplary embodiment. In another example, the electronic device may include an imaging lens system 100 according to a first exemplary embodiment and an imaging lens system 800 according to an eighth exemplary embodiment. In another example, the electronic device may include two imaging lens systems 200 according to a second exemplary embodiment and an imaging lens system 600 according to a sixth exemplary embodiment. However, the imaging lens systems that may be located in the electronic device according to the exemplary embodiments are not limited to the types described above.

[0353] Next, refer to Figure 21 and Figure 22 Describes an electronic device according to an exemplary embodiment.

[0354] The electronic device 1000 according to an exemplary embodiment may be a portable terminal. For example, the electronic device 1000 may be a smartphone. However, the type of electronic device 1000 is not limited to a smartphone. For example, the electronic device according to another exemplary embodiment may be a laptop computer.

[0355] Electronic device 1000 may include one or more camera modules 10 and 20. For example, two camera modules 10 and 20 may be mounted in electronic device 1000. The first camera module 10 and the second camera module 20 may be configured to image an object in the same direction. For example, the first camera module 10 and the second camera module 20 may be mounted on a surface of electronic device 1000 so that they are parallel to each other.

[0356] At least one of the first camera module 10 and the second camera module 20 may include an imaging lens system according to the first exemplary embodiment to the eighth exemplary embodiment. For example, the first camera module 10 may include an imaging lens system 100 according to the first exemplary embodiment.

[0357] The first camera module 10 can achieve high resolution. Specifically, as... Figure 22As shown, the first camera module 10 may have an image sensor IS diagonally positioned relative to the thickness direction of the electronic device 1000, and thus have a large image sensor IS required to achieve high resolution. More specifically, the image sensor IS may be positioned at an angle of 18 to 30 degrees relative to the front of the electronic device 1000 or the display device (e.g., a display panel).

[0358] The electronic device 1000 configured as described above can accommodate an image sensor and a camera module including the image sensor that are larger than the internal space (especially its thickness), and thus can simultaneously improve the performance of the camera module and reduce the thickness of the electronic device.

[0359] As described above, this disclosure provides an imaging lens system that can be installed in a small or thin terminal.

[0360] In addition, this disclosure can provide a camera module with a telephoto imaging lens system.

[0361] While specific exemplary embodiments have been shown and described above, it will be apparent upon understanding this disclosure that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be understood in a descriptive sense only and not for purposes of limitation. The description of features or aspects in each example should be considered 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 system, architecture, device, or circuit are combined in different ways and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of this disclosure is not limited by the specific embodiments but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in this disclosure.

Claims

1. An imaging lens system, comprising: An optical path folding component includes a first reflective surface, a second reflective surface, and a third reflective surface, wherein the first reflective surface, the second reflective surface, and the third reflective surface are configured to sequentially reflect light incident from the object side; as well as The first lens group is disposed on the object side or image side of the first reflecting surface; The first lens group includes a first lens with positive refractive power, a second lens with a convex object-side surface, and a third lens with a convex object-side surface. The first lens, the second lens, the third lens, the second reflective surface, and the third reflective surface are arranged sequentially from the object side along the optical axis. Where 15 mm < TTL < 26 mm, and TTL is the distance from the object side of the first lens to the imaging surface.

2. The imaging lens system according to claim 1, wherein, The angle between the first virtual plane including the first reflective surface and the second virtual plane including the second reflective surface is 15 degrees to 27 degrees.

3. The imaging lens system according to claim 1, wherein, 0.4 < BFL / TTL < 0.9 Wherein, BFL is the distance from the image side of the last lens in the imaging lens system that is closest to the imaging surface to the imaging surface.

4. The imaging lens system according to claim 1, wherein, 0.8 < TTL / f < 1.5, Where f is the focal length of the imaging lens system.

5. The imaging lens system according to claim 1, wherein, 0.4 < BFL / f < 1.0 Where f is the focal length of the imaging lens system, and BFL is the distance from the image side of the last lens in the imaging lens system that is closest to the imaging surface to the imaging surface.

6. The imaging lens system according to claim 1, wherein, 0.9 < BFL / f1 < 2.1 Where f1 is the focal length of the first lens, and BFL is the distance from the image side of the last lens in the imaging lens system that is closest to the imaging surface to the imaging surface.

7. An imaging lens system, including: An optical path folding component includes a first reflective surface, a second reflective surface, and a third reflective surface, wherein the first reflective surface, the second reflective surface, and the third reflective surface are configured to sequentially reflect light incident from the object side; as well as The first lens group is disposed on the object side or image side of the first reflecting surface; The first lens group includes a first lens with positive refractive power, a second lens with a convex object-side surface, and a third lens with a concave image-side surface. The first lens, the second lens, the third lens, the second reflective surface, and the third reflective surface are arranged sequentially from the object side along the optical axis. Where 15 mm < TTL < 26 mm, and TTL is the distance from the object side of the first lens to the imaging surface.

8. The imaging lens system according to claim 7, wherein, The angle between the first virtual plane including the first reflective surface and the second virtual plane including the second reflective surface is 15 degrees to 27 degrees.

9. The imaging lens system according to claim 7, wherein, 0.4 < BFL / TTL < 0.9 Wherein, BFL is the distance from the image side of the last lens in the imaging lens system that is closest to the imaging surface to the imaging surface.

10. The imaging lens system according to claim 7, wherein, 0.8 < TTL / f < 1.5, Where f is the focal length of the imaging lens system.

11. The imaging lens system according to claim 7, wherein, 0.4 < BFL / f < 1.0, Where f is the focal length of the imaging lens system, and BFL is the distance from the image side of the last lens in the imaging lens system that is closest to the imaging surface to the imaging surface.

12. The imaging lens system according to claim 7, wherein, 0.9 < BFL / f1 < 2.1 Where f1 is the focal length of the first lens, and BFL is the distance from the image side of the last lens in the imaging lens system that is closest to the imaging surface to the imaging surface.

Images