Imaging lens system

Abstract

The imaging lens system includes a first lens group, an optical path conversion element, and a second lens group arranged in this order from an object side. The optical axis of the second lens group is eccentrically disposed in one direction with respect to the geometric optical axis of the optical path conversion element.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2023-0113700 filed on August 29, 2023, in the Korean Intellectual Property Office, and Korean Patent Application No. 10-2023-0188666 filed on December 21, 2023, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein by reference in their entirety for all purposes. Technical Field

[0003] The present disclosure relates to an imaging lens system having an optical path conversion element. Background Art

[0004] A portable electronic device may include a camera module for capturing still images or moving video images. The camera module may be mounted on a portable phone, a notebook computer, a game console, and the like. To enhance user convenience, portable electronic devices are generally manufactured to be thinner or smaller in size. For example, a camera module mounted in a portable electronic device may be configured to have an imaging lens system in the form of an optical path conversion element. The optical path conversion element may separate the optical path of the imaging lens system that is elongated in one direction into two or more directions, thereby enabling the camera module to be thinned and miniaturized. However, an optical path conversion element such as a prism may cause a flicker phenomenon due to internal reflection, thereby reducing the resolution of the imaging lens system and the camera module.

[0005] The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with respect to the present disclosure. Summary of the invention

[0006] The purpose of providing this summary is to introduce a selection of inventive concepts in a concise form, and these inventive concepts will be further described in the following detailed description. This summary is not intended to identify the key features or essential features of the subject matter claimed, nor is it intended to help determine the scope of the subject matter claimed.

[0007] In a general aspect, an imaging lens system includes: a first lens group, an optical path conversion element, and a second lens group arranged in sequence from an object side. The optical axis of the second lens group is eccentrically arranged in one direction relative to the geometric optical axis of the optical path conversion element.

[0008] The optical axis of the first lens group may be eccentrically arranged in one direction relative to the geometric optical axis of the optical path conversion element.

[0009] The first lens group may include a plurality of lenses.

[0010] In the first lens group, the front lens disposed closest to the optical path conversion element may have positive refractive power.

[0011] In the first lens group, a frontmost lens disposed closest to the object may have a convex object-side surface.

[0012] The second lens group may include a plurality of lenses.

[0013] In the second lens group, the rear lens disposed closest to the optical path conversion element may have positive refractive power.

[0014] In the second lens group, the rearmost lens disposed closest to the imaging plane may have a positive refractive power or a convex image-side surface.

[0015] DPP / DPF can be greater than 1, where DPF is the distance of a light path extending from the object side surface of the optical path conversion element to the reflective surface of the optical path conversion element along the first optical axis of the first lens group, and DPR is the distance of a light path extending from the reflective surface of the optical path conversion element to the image side surface of the optical path conversion element along the second optical axis of the second lens group.

[0016] In another general aspect, the imaging lens system comprises: a first lens group, an optical path conversion element, and a second lens group arranged in sequence from the object side, wherein 0.060<(P B2 -P B1 ) / L B1 <0.20, where P B1 is the shortest distance from the point where the optical axis of the second lens group intersects the exit surface of the optical path conversion element to one side of the exit surface, P B2 is the shortest distance from the point where the optical axis of the second lens group intersects the exit surface of the optical path conversion element to the other side of the exit surface, and L B1 It is the effective radius of the object side surface of the rear lens closest to the exit surface in the second lens group.

[0017] Wherein, f is the focal length of the imaging lens system, and ImgH is the height of the imaging plane, and f / ImgH may be greater than 2.0 and less than 3.60.

[0018] In another general aspect, an imaging lens system includes: a first lens group, an optical path conversion element, and a second lens group arranged in sequence from an object side, wherein an optical axis of the second lens group intersects with an optical axis of the first lens group on a reflective surface at a position spaced apart from the center of the reflective surface of the optical path conversion element.

[0019] The above center may be the geometric optical axis of the optical path conversion element.

[0020] The optical axis of the second lens group may intersect the optical axis of the first lens group at a position closer to the center to the first lens group.

[0021] The optical axis of the second lens group may intersect the optical axis of the first lens group at a position farther from the second lens group than the center.

[0022] Other features and aspects will be apparent from the following detailed description, the accompanying drawings, and the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of a first example of an imaging lens system according to one or more embodiments of the present disclosure.

[0024] FIG. 2A to FIG. 2C is a schematic diagram of a second example of an imaging lens system according to one or more embodiments of the present disclosure.

[0025] Figure 3 is a schematic diagram of a third example of an imaging lens system according to one or more embodiments of the present disclosure.

[0026] Figure 4 is a schematic diagram of a fourth example of an imaging lens system according to one or more embodiments of the present disclosure.

[0027] Figure 5 is a schematic diagram of a fifth example of an imaging lens system according to one or more embodiments of the present disclosure.

[0028] Figure 6 is a schematic diagram of a sixth example of an imaging lens system according to one or more embodiments of the present disclosure.

[0029] Figure 7 is a schematic diagram of a seventh example of the imaging lens system according to one or more embodiments of the present disclosure.

[0030] Figure 8 is a schematic diagram of an eighth example of the imaging lens system according to one or more embodiments of the present disclosure.

[0031] Throughout the drawings and detailed description, unless otherwise described, the same reference numerals may be understood to refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0032] Hereinafter, although examples of the present disclosure will be described in detail with reference to the accompanying drawings, it should be noted that the examples are not limited thereto.

[0033] In describing the exemplary embodiments of the present disclosure, since terms related to components of the present disclosure are named in consideration of the function of each component, the terms should not be understood as meaning to limit the technical components of the present disclosure.

[0034] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described in this application. However, various changes, modifications and equivalents of the methods, devices and / or systems described in this application will be apparent after understanding the present disclosure. For example, the order of operations described in this application is merely an example, and except for operations that must occur in a specific order, it is not limited to the order set forth in this application, but can be changed, which will be apparent after understanding the present disclosure. In addition, for greater clarity and brevity, the description of features known in the art may be omitted.

[0035] The features described in this application may be implemented in different forms and are not to be construed as being limited to the examples described in this application. Rather, the examples described in this application are provided only to illustrate some of the many possible ways to implement the methods, devices and / or systems described in this application, which will be apparent after understanding this disclosure.

[0036] Throughout the specification, when an element such as a layer, a region, or a substrate is described as being “on,” “connected to,” or “coupled to” another element, the element may be directly “on,” “connected to,” or “coupled to” the other element, or one or more other elements may be present between the element and the other element. Conversely, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, no other elements may be present between the element and the other element.

[0037] As used in this application, the wording "and / or" includes any one of the associated listed items and any combination of any two or more items. Similarly, "at least one" includes any one of the associated listed items and any combination of any two or more items.

[0038] Although the terms "first", "second" and "third" may be used in this application to describe various components, components, regions, layers or sections, these components, components, regions, layers or sections are not limited by these terms. More specifically, these terms are only used to distinguish one component, component, region, layer or section from another component, component, region, layer or section. Therefore, without departing from the teachings of the examples described in this application, the first component, first component, first region, first layer or first section mentioned in these examples may also be referred to as the second component, second component, second region, second layer or second section.

[0039] Spatially relative terms such as "above", "higher", "below", "lower" and the like may be used in this application for descriptive convenience to describe the relationship of one element relative to another element as shown in the accompanying drawings. In addition to covering the orientations depicted in the accompanying drawings, these spatially relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the accompanying drawings is flipped, an element described as being "above" or "higher" relative to another element will be "below" or "lower" relative to the other element. Therefore, depending on the spatial orientation of the device, the term "above" covers both "above" and "below" orientations. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used in this application should be interpreted accordingly.

[0040] The terms used in this application are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the words "a", "an" and "the" are intended to include plural forms as well. The words "comprise", "include" and "have" indicate the presence of stated features, numbers, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, components, elements and / or combinations thereof.

[0041] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described in the present application are not limited to the specific shapes shown in the drawings, but include variations in shapes that occur during manufacturing.

[0042] In this application, it should be noted that use of the wording “may” with respect to examples, such as regarding what an example may include or implement, means that there is at least one example in which such feature is included or implemented, and all examples are not limited thereto.

[0043] The features of the examples described in this application can be combined in various ways, which will be apparent after understanding the present disclosure. In addition, although the examples described in this application have multiple configurations, it will be apparent after understanding the present disclosure that other configurations are also possible.

[0044] The present disclosure can solve the above-mentioned problems, although the present disclosure is not limited thereto. An object of the present disclosure is to provide an imaging lens system configured to reduce a scintillation phenomenon caused by an optical path conversion element.

[0045] In this specification, the frontmost lens or the first lens refers to the lens closest to the object (or subject), and the rearmost lens refers to the lens closest to the imaging plane (or image sensor). In this specification, the unit of the radius of curvature, thickness, TTL (the distance from the object side of the first lens to the imaging plane), ImgH (or Y: the height of the imaging plane) and focal length of the lens is mm (millimeter).

[0046] The thickness of the lens, the distance between the lenses, and TTL are the distances of the lenses on the optical axis. In addition, in the description of the lens shape, a convex shape on one surface means that the paraxial area on that side is convex, and a concave shape on one surface means that the paraxial portion on that side is concave. Therefore, even if one surface of the lens is described as having a convex shape, the edge portion of the lens may be concave. Similarly, even if one surface of the lens is described as having a concave shape, the edge portion of the lens may be convex.

[0047] The paraxial region of the lens surface is the central portion of the lens surface surrounding and including the optical axis of the lens surface, where light incident on the lens surface forms a smaller angle θ with the optical axis and the approximations of sinθ≈θ, tanθ≈θ and cosθ≈1 are valid.

[0048] The imaging lens system according to the first embodiment of the present disclosure may include a first lens group, an optical path conversion element, and a second lens group arranged in sequence from the object side. However, the number of lens groups constituting the imaging lens system according to the first embodiment is not limited to two. For example, the imaging lens system according to the first embodiment may also include a third lens group arranged on the image side of the second lens group. In the imaging lens system according to the first embodiment, the optical path conversion element and the second lens group may form a unique arrangement relationship. For example, in the imaging lens system according to the first embodiment, the optical axis of the second lens group may be eccentrically arranged relative to the geometric optical axis of the optical path conversion element. For reference, the geometric optical axis of the optical path conversion element may be determined based on the reflective surface. For example, the geometric optical axis of the optical path conversion element may be a normal connecting the incident surface and the exit surface of the optical path conversion element from the center of the reflective surface (the point where different diagonals of the reflective surface intersect).

[0049] The imaging lens system according to the first embodiment may also optionally include one or more of the following features.

[0050] As an example, in the imaging lens system according to the first embodiment, the optical axis of the first lens group may be disposed eccentrically with respect to the geometrical optical axis of the optical path conversion element.

[0051] As another example, in the imaging lens system according to the first embodiment, the first lens group may include at least one lens. As a specific example, the first lens group may include three or more lenses.

[0052] As another example, in the imaging lens system according to the first embodiment, the first lens group may include a lens having positive refractive power. As a specific example, the front lens disposed closest to the optical path conversion element in the first lens group may have positive refractive power.

[0053] As another example, in the imaging lens system according to the first embodiment, the first lens group may include a lens having a convex object-side surface. As a specific example, the frontmost lens disposed closest to the object in the first lens group may have a convex object-side surface.

[0054] As another example, in the imaging lens system according to the first embodiment, the second lens group may include a plurality of lenses. As a specific example, the second lens group may include two or more lenses.

[0055] As another example, in the imaging lens system according to the first embodiment, the second lens group may include a lens having positive refractive power. As a specific example, the rear lens disposed closest to the optical path conversion element in the second lens group may have positive refractive power.

[0056] As another example, in the imaging lens system according to the first embodiment, the second lens group may include a lens having positive refractive power or having a convex image-side surface. As a specific example, the rearmost lens disposed closest to the imaging surface in the second lens group may have positive refractive power or may have a convex image-side surface.

[0057] The imaging lens system according to the second embodiment of the present disclosure may include a first lens group, an optical path conversion element, and a second lens group arranged in sequence from the object side. However, the number of lens groups constituting the imaging lens system according to the second embodiment is not limited to two. For example, the imaging lens system according to the second embodiment may also include a third lens group arranged on the image side of the second lens group. The imaging lens system according to the second embodiment may satisfy a unique conditional expression. For example, the imaging lens system according to the second embodiment may satisfy the conditional expression, namely, 0.060<(P B2 -P B1 ) / L B1<0.20. In this conditional expression, P B1 is the shortest distance from the point where the optical axis of the second lens group intersects the exit surface of the optical path conversion element to one side of the exit surface, P B2 is the shortest distance from the point where the optical axis of the second lens group intersects the exit surface of the optical path conversion element to the other side of the exit surface, and L B1 It is the effective radius of the object side surface of the rear lens closest to the exit surface in the second lens group.

[0058] The imaging lens system according to the second embodiment may also optionally include one or more of the following features.

[0059] For example, in the imaging lens system according to the second embodiment, the optical axis of the first lens group may be disposed eccentrically with respect to the geometrical optical axis of the optical path conversion element.

[0060] As another example, in the imaging lens system according to the second embodiment, the first lens group may include at least one lens. As a specific example, the first lens group may include three or more lenses.

[0061] As another example, in the imaging lens system according to the second embodiment, the first lens group may include a lens having positive refractive power. As a specific example, the front lens disposed closest to the optical path conversion element in the first lens group may have positive refractive power.

[0062] As another example, in the imaging lens system according to the second embodiment, the first lens group may include a lens having a convex object-side surface. As a specific example, the frontmost lens disposed closest to the object in the first lens group may have a convex object-side surface.

[0063] As another example, in the imaging lens system according to the second embodiment, the second lens group may include a plurality of lenses. As a specific example, the second lens group may include two or more lenses.

[0064] As another example, in the imaging lens system according to the second embodiment, the second lens group may include a lens having positive refractive power. As a specific example, the rear lens disposed closest to the optical path conversion element in the second lens group may have positive refractive power.

[0065] As another example, in the imaging lens system according to the second embodiment, the second lens group may include a lens having positive refractive power or having a convex image-side surface. As a specific example, the rearmost lens disposed closest to the imaging plane in the second lens group may have positive refractive power or may have a convex image-side surface.

[0066] An imaging lens system according to a third embodiment of the present disclosure includes a first lens group, an optical path conversion element, and a second lens group arranged in order from the object side, and may satisfy one or more of the following conditional expressions.

[0067] (1) 1.0 < DPR / DPF

[0068] (2) 0.95 < L A1 / L A2 < 1.05

[0069] (3) 0.95 < L B1 / L B2 < 1.05

[0070] (4) 0.80 < P A1 / P A2 < 1.0

[0071] (5) 0.80 < P B1 / P B2 < 1.0

[0072] (6) 0.10 < DLP

[0073] (7) 0.50 < DPL

[0074] (8) 0.50 < (DLP+DPF) / (DPL+DPR) < 1.0

[0075] (9) 2.0 < fG1 / DLPL

[0076] In the above conditional expressions, DPF is the distance from the incident surface of the optical path conversion element to the reflection surface of the optical path conversion element calculated based on the first optical axis of the first lens group, DPR is the distance from the reflection surface of the optical path conversion element to the exit surface of the optical path conversion element calculated based on the second optical axis of the second lens group, and L A1 L is the effective radius of the front lens closest to the object in the first lens group on one side (the direction farthest from the second lens group), A2 is the effective radius of the front lens on the other side (the direction closest to the second lens group), L B1 L is the effective radius of the rear lens closest to the optical path conversion element in the second lens group in one direction (the direction closest to the first lens group), B2 is the effective radius of the rear lens in the other direction (the direction farthest from the first lens group), P A1 is the shortest distance from the point where the incident surface of the optical path conversion element intersects the first optical axis to the point on the incident surface farthest from the second lens group, P A2is the shortest distance from the point where the incident surface of the optical path conversion element intersects the first optical axis to the point on the incident surface closest to the second lens group, P B1 is the shortest distance from the point where the exit surface of the optical path conversion element intersects the second optical axis to the point on the exit surface closest to the first lens group, P B2 is the shortest distance from the point where the exit surface of the optical path conversion element intersects the second optical axis to the point on the exit surface farthest from the first lens group, DLP is the distance from the image side surface of the front lens closest to the optical path conversion element in the first lens group to the incident surface of the optical path conversion element, DPL is the distance from the exit surface of the optical path conversion element to the object side surface of the rear lens closest to the optical path conversion element in the second lens group, fG1 is the focal length of the first lens group, and DLPL is the distance from the image side surface of the front lens to the object side surface of the rear lens (based on the first optical axis and the second optical axis).

[0077] Conditional Expression 1 may be a condition for forming a long optical path length of light totally reflected by the optical path conversion element. For example, an imaging lens system that does not satisfy Conditional Expression 1 may have difficulty in realizing a telephoto optical system or an optical system with a long focal length. In addition, an imaging lens system that does not satisfy Conditional Expression 1 may cause a flicker phenomenon by the optical path conversion element.

[0078] Conditional expressions 2 and 3 may be conditions for limiting the shape, brightness, and peripheral light ratio of the lens group. For example, a lens group or lens that does not satisfy conditional expressions 2 and 3 may have an asymmetric shape that is biased to one side relative to the optical axis, which may make it difficult to achieve a bright imaging lens system and may deteriorate the peripheral light ratio of the imaging lens system.

[0079] Conditional Expressions 4 and 5 may be conditions for reducing a flicker phenomenon caused by an optical path conversion element. For example, an optical path conversion element that does not satisfy Conditional Expressions 4 and 5 may cause a flicker phenomenon during total reflection of light incident on the optical path conversion element.

[0080] Conditional expressions 6, 7, and 9 may be conditions for realizing a telephoto optical system and a compact optical system. For example, an imaging lens system that does not satisfy conditional expressions 6, 7, and 9 may not only be difficult to realize telephoto characteristics, but may also be difficult to install in a small electronic device (e.g., a portable terminal). In addition, an imaging lens system that does not satisfy conditional expressions 6, 7, and 9 may be difficult to realize a low f-number.

[0081] Conditional Expression 8 may be a condition for realizing a compact optical system and a high-resolution optical system. For example, an imaging lens system that does not satisfy Conditional Expression 8 may be difficult to install in a small electronic device. In addition, an imaging lens system that does not satisfy Conditional Expression 8 may cause a flicker phenomenon by an optical path conversion element.

[0082] Conditional Expression 9 may be a condition for realizing a high-resolution optical system. For example, in an imaging lens system that does not satisfy Conditional Expression 9, since the focal length of the first lens group is smaller than the air gap between the first lens group and the second lens group, it may be difficult to form a clear image on the imaging surface.

[0083] The imaging lens system according to the fourth embodiment includes a first lens group, an optical path conversion element, and a second lens group arranged in order from the object side, and may satisfy one or more of the following conditional expressions.

[0084] (10) 1.20 < fG1 / f < 3.20

[0085] (11) 1.0 < fG2 / f < 2.0

[0086] (12) 0.020 < fG1 / fG2 < 12.0

[0087] (13) 1.20 < fG1 / DPIP < 2.60

[0088] (14) 0.80 < fG2 / DPIP < 2.0

[0089] (15) 2.0 < f / ImgH < 3.60

[0090] (16) 1.0 < TTL / f < 1.60

[0091] (17) 1.0 < L A1 / P A1 < 1.80

[0092] (18) 0.80 < L A2 / P A2 < 1.60

[0093] (19) 0.60 < L B1 / P B1 < 1.20

[0094] (20) 0.60 < L B2 / P B2 < 1.0

[0095] (21) 0.020 < (P A1 -P A2 ) / L A1 < 0.080

[0096] (22) 0.060 < (P B1 -P B2) / L B1 < 0.20

[0097] In the conditional expression, f is the focal length of the imaging lens system, fG2 is the focal length of the second lens group, ImgH is the height of the imaging plane, DPIP is the distance from the reflecting surface of the optical path conversion element to the imaging plane (based on the second optical axis), and TTL is the distance from the object side surface of the frontmost lens to the imaging plane (based on the first optical axis and the second optical axis).

[0098] Conditional expressions 10 to 12 may be conditions for limiting the refractive power of the first lens group and the second lens group to realize a high-resolution imaging lens system. For example, an imaging lens system that does not satisfy all of conditional expressions 10 to 12 may have difficulty in realizing high resolution. For example, in order to realize a high-resolution imaging lens system, two or more of conditional expressions 10 to 12 may be satisfied. As another example, in order to realize a high-resolution imaging lens system, all of conditional expressions 10 to 12 may be satisfied.

[0099] Conditional Expressions 13 and 14 may be conditions for limiting the refractive power of the first lens group and the second lens group to achieve a high-resolution imaging lens system. For example, an imaging lens system that does not satisfy both of Conditional Expressions 13 and 14 may have difficulty in achieving high resolution.

[0100] Conditional Expression 15 may be a condition for realizing a compact telephoto optical system. For example, since it is difficult to realize a telephoto optical system including an optical path conversion element, an imaging lens system that does not satisfy Conditional Expression 15 may be difficult to install in a portable terminal.

[0101] Conditional Expression 16 may be a condition for realizing a compact optical system. For example, an imaging lens system that does not satisfy Conditional Expression 16 may be difficult to install in a portable terminal.

[0102] Conditional Expressions 17 to 22 may be conditions for reducing a flicker phenomenon caused by an optical path conversion element. For example, an imaging lens system that does not satisfy Conditional Expressions 17 to 22 may have difficulty in reducing a flicker phenomenon caused by an optical path conversion element.

[0103] The imaging lens system according to the present disclosure may include one or more lenses having the following characteristics as needed. As an example, the imaging lens system according to the first embodiment may include one of the first lens to the sixth lens according to the following characteristics. As another example, the imaging lens system according to the second embodiment to the fourth embodiment may include one or more of the first lens to the sixth lens according to the following characteristics. However, the imaging lens system according to the above form does not necessarily include lenses according to the following characteristics. In the following, the characteristics of the first lens to the sixth lens will be described.

[0104] The first lens has a refractive power. For example, the first lens may have a positive refractive power or a negative refractive power. The first lens may have a convex shape on one side surface thereof. For example, the first lens may have a convex object side surface. The first lens includes a spherical surface or an aspherical surface. For example, both surfaces of the first lens may be aspherical. The first lens may be formed of a material having high light transmittance and good processability. For example, the first lens may be formed of plastic or glass. The first lens may be configured to have a predetermined refractive index. For example, the refractive index of the first lens may be greater than 1.5. As a specific example, the refractive index of the first lens may be greater than 1.50 and less than 1.60. The first lens may have a predetermined Abbe number. For example, the Abbe number of the first lens may be 50 or greater.

[0105] The second lens has a refractive power. For example, the second lens may have a positive refractive power or a negative refractive power. The second lens has a convex shape on one surface thereof. For example, the second lens may have a convex image side surface. The second lens may be formed of a material having high light transmittance and good processability. For example, the second lens may be formed of plastic or glass. The second lens may be configured to have a predetermined refractive index. For example, the refractive index of the second lens may be greater than 1.5. The second lens may have a predetermined Abbe number. For example, the Abbe number of the second lens may be 20 or greater.

[0106] The third lens has a refractive power. For example, the third lens may have a positive refractive power or a negative refractive power. The third lens has a concave shape on one surface thereof. As an example, the third lens may have a concave object side surface. The third lens includes a spherical surface or an aspherical surface. For example, both surfaces of the third lens may be aspherical. The third lens may be formed of a material having high light transmittance and good processability. For example, the third lens may be formed of a plastic material. The third lens may be configured to have a predetermined refractive index. For example, the refractive index of the third lens may be greater than 1.5. The third lens may have a predetermined Abbe number. For example, the Abbe number of the third lens may be greater than 20.

[0107] The fourth lens has a refractive power. For example, the fourth lens may have a positive refractive power or a negative refractive power. The fourth lens has a concave shape on one surface thereof. As an example, the fourth lens may have a concave object side surface. As another example, the fourth lens may have a concave image side surface. The fourth lens includes a spherical surface or an aspherical surface. For example, both surfaces of the fourth lens may be aspherical. The fourth lens may be formed of a material having high light transmittance and good processability. For example, the fourth lens may be formed of a plastic material. The fourth lens may have a predetermined refractive index. For example, the refractive index of the fourth lens may be greater than 1.5. The fourth lens may have a predetermined Abbe number. For example, the Abbe number of the fourth lens may be 20 or greater.

[0108] The fifth lens has a refractive power. For example, the fifth lens may have a negative refractive power. The fifth lens has a convex shape on one surface thereof. As an example, the fifth lens may have a convex object side surface. The fifth lens includes a spherical or aspherical surface. For example, both surfaces of the fifth lens may be aspherical. The fifth lens may be formed of a material having high light transmittance and good processability. For example, the fifth lens may be formed of a plastic material. The fifth lens may have a predetermined refractive index. As an example, the refractive index of the fifth lens may be greater than 1.6. The fifth lens may have a predetermined Abbe number. For example, the Abbe number of the fifth lens may be greater than 20.

[0109] The sixth lens has a refractive power. For example, the sixth lens may have a positive refractive power. The sixth lens has a convex shape on one surface. As an example, the sixth lens may have a convex object side surface. The sixth lens includes a spherical surface or an aspherical surface. For example, both surfaces of the sixth lens may be aspherical. The sixth lens may be formed of a material having high light transmittance and good processability. For example, the sixth lens may be formed of a plastic material. The sixth lens may be configured to have a predetermined refractive index. For example, the refractive index of the sixth lens may be greater than 1.5. The sixth lens may have a predetermined Abbe number. For example, the Abbe number of the sixth lens may be greater than 20.

[0110] As described above, the first to sixth lenses may include a spherical surface or an aspherical surface. When the first to sixth lenses include an aspherical surface, the aspherical surface of the corresponding lens may be expressed by Equation 1.

[0111] Equation 1:

[0112]

[0113] In Equation 1, c is the inverse of the radius of curvature of the corresponding lens, k is the cone constant, r is the distance from any point on the aspherical surface to the optical axis, A to H and J are aspherical constants, and Z (or SAG) is the height from any point on the aspherical surface to the vertex of the corresponding aspherical surface in the direction of the optical axis.

[0114] The imaging lens system according to the above embodiment or the above aspect may further include an aperture and a filter. The aperture may be arranged between the first lens and the third lens, or between the fourth lens and the fifth lens. The filter may be arranged between the rearmost lens and the imaging surface. The filter may be configured to block light of a specific wavelength. For reference, the filter described in this specification is configured to block infrared rays, but the wavelength of light blocked by the filter is not limited to infrared rays.

[0115] Next, we will refer to Figures 1 to 3Various examples of an imaging lens system including an optical path conversion element according to one or more embodiments of the present disclosure are described.

[0116] First, refer to Figure 1 An imaging lens system according to a first example is described.

[0117] The imaging lens system 10 according to the first example may include a first lens group LG1, an optical path conversion element P1, and a second lens group LG2. However, the configuration of the imaging lens system 10 according to the first example is not limited to the first lens group LG1, the optical path conversion element P1, and the second lens group LG2. For example, the imaging lens system 10 according to the first example may further include a third lens group disposed between the second lens group LG2 and the imaging surface IP.

[0118] The first lens group LG1 may include one or more lenses. For example, the first lens group LG1 may include one to three lenses. However, the number of lenses constituting the first lens group LG1 is not limited to one to three. The first lens group LG1 may include a lens having a positive refractive power. For example, in the first lens group LG1, the frontmost lens disposed closest to the object may have a positive refractive power. The first lens group LG1 may include a lens having a convex object side surface. For example, the front lens disposed closest to the optical path conversion element P1 in the first lens group LG1 may have a convex object side surface. The first lens group LG1 may be disposed in a unique form relative to the optical path conversion element P1. For example, the first optical axis C1 of the first lens group LG1 may be relative to the geometric first optical axis P1 of the optical path conversion element P1. C1 Set off-center in one direction.

[0119] The frontmost lens may have an effective radius of a predetermined size. As an example, the frontmost lens may have an effective radius L centered on the first optical axis C1. A1 and L A2 .L A1 is the effective radius centered on the first optical axis C1 to one side (the point farthest from the second lens group LG2), and L A2 L is the effective radius from the first optical axis C1 to the other side (the point closest to the second lens group LG2). A1 and L A2 can have different sizes, but do not have to have different sizes. For example, when the frontmost lens is symmetrical, L A1 and L A2 Can have the same size.

[0120] The second lens group LG2 may include one or more lenses. For example, the second lens group LG2 may include two or three lenses. However, the number of lenses constituting the second lens group LG2 is not limited to two or three. The second lens group LG2 may include a lens having a positive refractive power. For example, in the second lens group LG2, the rear lens disposed closest to the optical path conversion element P1 may have a positive refractive power. In the second lens group LG2, the rearmost lens disposed closest to the imaging surface IP may have a unique refractive power or shape. For example, the rearmost lens may have a positive refractive power or may have a convex image side surface. The second lens group LG2 may be arranged in a unique form relative to the optical path conversion element P1. For example, the second optical axis C2 of the second lens group LG2 may be relative to the geometric second optical axis P of the optical path conversion element P1. C2 Set off-center in one direction.

[0121] The rear lens may have an effective radius of a predetermined size. As an example, the rear lens may have an effective radius L centered on the second optical axis C2. B1 and L B2 .L B1 is the effective radius centered on the second optical axis C2 to one side (the point closest to the first lens group LG1), and L B2 L is the effective radius from the second optical axis C2 to the other side (the point farthest from the first lens group LG1). B1 and L B2 can have different sizes, but do not have to have different sizes. For example, when the rear lens is symmetrical, L B1 and L B2 Can have the same size.

[0122] The optical path conversion element P1 may be disposed between the first lens group LG1 and the second lens group LG2. In addition, the optical path conversion element P1 may be disposed between the lens closest to the imaging plane IP in the first lens group LG1 and the lens closest to the object in the second lens group LG2. The optical path conversion element P1 may be disposed at a predetermined distance from the first lens group LG1 and the second lens group LG2. For example, the incident surface IP of the optical path conversion element P1 S1 The image side surface of the front lens closest to the optical path conversion element P1 in the first lens group LG1 may be spaced apart by a predetermined distance DLP, and the exit surface P1 of the optical path conversion element P1 may be spaced apart by a predetermined distance DLP. S2 The object-side surface of the rear lens closest to the optical path conversion element P1 in the second lens group LG2 may be spaced apart by a predetermined distance DPL. Here, DLP and DPL may be positive numbers other than 0.

[0123] The optical path conversion element P1 may have a unique arrangement relationship with the first lens group LG1 and the second lens group LG2. For example, the optical path conversion element P1 may be arranged so that the geometric optical axis P of the optical path conversion element P1 is C The first optical axis C1 of the first lens group LG1 and the second optical axis C2 of the second lens group LG2 do not coincide with each other. S1 and the geometrical optical axis P of the optical path conversion element P1 C The first line segment P C1 (Also called geometric first optical axis P C1 ) can be formed to be closer to the second lens group LG2 than the first optical axis C1. As another example, the exit surface P connected to the optical path conversion element P1 S2 and the geometrical optical axis P of the optical path conversion element P1 C The second line segment P C2 (also called the geometric second optical axis P C2 ) can be formed to be farther away from the first lens group LG1 than the second optical axis C2.

[0124] The incident surface P of the optical path conversion element P1 S1 and the exit surface P S2 The optical path conversion element P1 may be divided into a unique shape by the first optical axis C1 and the second optical axis C2. S1 The point from the intersection with the first optical axis C1 to the incident surface P S1 The shortest distance P on one side (the point farthest from the second lens group LG2) A1 It can be smaller than the incident surface P from the optical path conversion element P1 S1 The point from the intersection with the first optical axis C1 to the incident surface P S1 The shortest distance P on the other side (the point closest to the second lens group LG2) A2 As another example, from the exit surface P of the optical path conversion element P1 S2 The point from the intersection with the second optical axis C2 to the exit surface P S2 The shortest distance P on one side (the point closest to the first lens group LG1) B1 It can be smaller than the exit surface P from the optical path conversion element P1 S2 The point from the intersection with the second optical axis C2 to the exit surface P S2 The shortest distance P on the other side (the point farthest from the first lens group LG1) B2 .

[0125] Next, we will refer to FIG. 2A to FIG. 2C An imaging lens system according to a second example is described.

[0126] The imaging lens system 20 according to the second example may include a first lens group LG1, an optical path conversion element P2, and a second lens group LG2. However, the configuration of the imaging lens system 20 according to the second example is not limited to the first lens group LG1, the optical path conversion element P2, and the second lens group LG2. For example, the imaging lens system 20 according to the second example may further include a third lens group disposed between the second lens group LG2 and the imaging surface IP. For reference, since the configurations of the first lens group LG1 and the second lens group LG2 are the same as those of the first lens group LG1 and the second lens group LG2 of the imaging lens system 10 according to the first example, a detailed description of these configurations will be omitted.

[0127] The optical path conversion element P2 may be disposed between the first lens group LG1 and the second lens group LG2. In addition, the optical path conversion element P2 may be disposed between the lens closest to the imaging plane IP in the first lens group LG1 and the lens closest to the object in the second lens group LG2. The optical path conversion element P2 may be disposed at a predetermined distance from the first lens group LG1 and the second lens group LG2. For example, the incident surface IP of the optical path conversion element P2 may be S1 The image side surface of the front lens closest to the optical path conversion element P2 in the first lens group LG1 may be spaced apart by a predetermined distance DLP, and the exit surface P of the optical path conversion element P2 may be spaced apart by a predetermined distance DLP. S2 The object-side surface of the rear lens closest to the optical path conversion element P2 in the second lens group LG2 may be spaced apart by a predetermined distance DPL. Here, DLP and DPL may be positive numbers other than 0.

[0128] The optical path conversion element P2 may have a unique arrangement relationship with the first lens group LG1 and the second lens group LG2. For example, the optical path conversion element P2 may be arranged so that the geometric optical axis P of the optical path conversion element P2 C The first optical axis C1 of the first lens group LG1 and the second optical axis C2 of the second lens group LG2 do not coincide with each other. S1 and the geometrical optical axis P of the optical path conversion element P2 C The first line segment P C1 The optical path conversion element P2 may be formed closer to the second lens group LG2 than the first optical axis C1. S2 and the geometrical optical axis P of the optical path conversion element P2 C The second line segment P C2 It can be formed to be farther from the first lens group LG1 than the second optical axis C2.

[0129] The incident surface P of the optical path conversion element P2 S1 and the exit surface P S2The optical path conversion element P2 may be divided into a unique shape by the first optical axis C1 and the second optical axis C2. S1 The point from the intersection with the first optical axis C1 to the incident surface P S1 The shortest distance P on one side (the point farthest from the second lens group LG2) A1 It can be smaller than the incident surface P from the optical path conversion element P2 S1 The point from the intersection with the first optical axis C1 to the incident surface P S1 The shortest distance P on the other side (the point closest to the second lens group LG2) A2 As another example, from the exit surface P of the optical path conversion element P2 S2 The point from the intersection with the second optical axis C2 to the exit surface P S2 The shortest distance P on one side (the point closest to the first lens group LG1) B1 It can be smaller than the exit surface P from the optical path conversion element P2 S2 The point from the intersection with the second optical axis C2 to the exit surface P S2 The shortest distance P on the other side (the point farthest from the first lens group LG1) B2 .

[0130] The imaging lens system 20 according to the second example may further include a component for adjusting the amount of light incident on the second lens group LG2. For example, the light blocking member SM may be formed on the exit surface P2 of the optical path conversion element P2. S2 The light blocking member SM may be aligned with the exit surface P of the light path conversion element P2. S2 Integrally formed or attached to the exit surface P of the optical path conversion element P2 S2 As an example, the light blocking member SM may be formed on the exit surface P of the light path conversion element P2 using a printing method. S2 As another example, the light blocking member SM may be attached to the exit surface P of the light path conversion element P2 in a film shape. S2 However, the formation method and shape of the light blocking member SM are not limited to the above-mentioned forms.

[0131] In the imaging lens system 20 according to the second example, the light blocking member SM can be formed by being restricted to the exit surface P S2 For example, the light blocking member SM may be formed by being limited to the exit surface P S2 The shortest distance P B2 The area corresponding to the range is formed (see Figure 2B However, the formation area of ​​the light blocking member SM is not limited to the exit surface P. S2 The shortest distance P B2 For example, the light blocking member SM may be formed on the exit surface P in different sizes. S2The shortest distance P B1 The part within the range and the shortest distance P B2 As a specific example, the shortest distance P B2 The size (or length) of the light blocking member SM in the portion within the range of may be larger than that formed at the shortest distance P B1 The size (or length) of the light blocking member SM in the portion within the range of Figure 2C ).

[0132] The imaging lens system 20 according to the second example configured as described above can reduce a scintillation phenomenon that may be caused by internal reflection of the optical path conversion element P2 by the light blocking member SM.

[0133] Next, we will refer to Figure 3 An imaging lens system according to a third example is described.

[0134] The imaging lens system 30 according to the third example may include a first lens group LG1, an optical path conversion element P3, and a second lens group LG2. However, the configuration of the imaging lens system 30 according to the third example is not limited to the first lens group LG1, the optical path conversion element P3, and the second lens group LG2. For example, the imaging lens system 30 according to the third example may further include a third lens group disposed between the second lens group LG2 and the imaging surface IP. For reference, since the configurations of the first lens group LG1 and the second lens group LG2 are the same as those of the first lens group LG1 and the second lens group LG2 of the imaging lens system 10 according to the first example, a detailed description of these configurations will be omitted.

[0135] The optical path conversion element P3 may be disposed between the first lens group LG1 and the second lens group LG2. In addition, the optical path conversion element P3 may be disposed between the lens closest to the imaging plane IP in the first lens group LG1 and the lens closest to the object in the second lens group LG2. The optical path conversion element P3 may be disposed at a predetermined distance from the first lens group LG1 and the second lens group LG2. For example, the incident surface IP of the optical path conversion element P3 may be S1 The image side surface of the front lens closest to the optical path conversion element P3 in the first lens group LG1 may be spaced apart by a predetermined distance DLP, and the exit surface P of the optical path conversion element P3 may be spaced apart by a predetermined distance DLP. S2 The object side surface of the rear lens closest to the optical path conversion element P3 in the second lens group LG2 may be spaced apart by a predetermined distance DPL. Here, DLP and DPL may be positive numbers other than 0.

[0136] The optical path conversion element P3 may have a unique arrangement relationship with the first lens group LG1 and the second lens group LG2. For example, the optical path conversion element P3 may be arranged so that the geometric optical axis P of the optical path conversion element P3 CThe first optical axis C1 of the first lens group LG1 and the second optical axis C2 of the second lens group LG2 do not coincide with each other. S1 and the geometrical optical axis P of the optical path conversion element P3 C The first line segment P C1 The optical path conversion element P3 may be formed closer to the second lens group LG2 than the first optical axis C1. S2 and the geometrical optical axis P of the optical path conversion element P3 C The second line segment P C2 It can be formed to be farther from the first lens group LG1 than the second optical axis C2.

[0137] The incident surface P of the optical path conversion element P3 S1 and the exit surface P S2 The optical path conversion element P3 may be divided into a unique shape by the first optical axis C1 and the second optical axis C2. S1 The point from the intersection with the first optical axis C1 to the incident surface P S1 The shortest distance P on one side (the point farthest from the second lens group LG2) A1 It can be smaller than the incident surface P from the optical path conversion element P3 S1 The point from the intersection with the first optical axis C1 to the incident surface P S1 The shortest distance P on the other side (the point closest to the second lens group LG2) A2 As another example, from the exit surface P of the optical path conversion element P3 S2 The point from the intersection with the second optical axis C2 to the exit surface P S2 The shortest distance P on one side (the point closest to the first lens group LG1) B1 It can be smaller than the exit surface P from the optical path conversion element P3 S2 The point from the intersection with the second optical axis C2 to the exit surface P S2 The shortest distance P on the other side (the point farthest from the first lens group LG1) B2 .

[0138] The imaging lens system 30 according to the third example may be configured to reduce the emission surface P S2 For example, the imaging lens system 30 may include an extension portion PE extending in the direction of the second optical axis C2, such as Figure 3As shown. The extension part PE can be integrally formed with the optical path conversion element P3, or can be attached to the optical path conversion element P3. In the latter case, the extension part PE can be formed of a material different from that of the optical path conversion element P3. As an example, the optical path conversion element P3 and the extension part PE can have different refractive indices within the range satisfying the conditional expression 0.8 < NP3 / NPE < 1.2. For reference, NP3 refers to the refractive index of the optical path conversion element P3, and NPE is the refractive index of the extension part PE.

[0139] The imaging lens system 30 according to the third example can be configured to prevent light from entering through the extension part PE. For example, the side surface of the extension part PE that is substantially parallel to the second optical axis C2 can be configured to block light through a predetermined substance or material. The extension part PE can be formed to have a predetermined length P A3 . For example, P A3 can be formed to have a smaller size than P A1 . However, the size of P A3 is not necessarily smaller than P A1 .

[0140] The imaging lens system 30 according to the third example configured as described above can reduce the flicker phenomenon that may be caused by internal reflection of the optical path conversion element P3 through the extension part PE.

[0141] Next, several examples of the lens shape of the imaging lens system according to one or more of the above embodiments will be described with reference to Figures 4 to 8 As a reference, although not shown in the drawings, the imaging lens systems according to the fourth to eighth examples described below can have an arrangement structure that is the same as or similar to the arrangement structure of the first lens group and the second lens group of the imaging lens systems according to the first to third examples described above. As an example, the first lens group, the optical path conversion element, and the second lens group of the imaging lens systems according to the fourth to eighth examples can include the features according to the first example. As another example, the first lens group, the optical path conversion element, and the second lens group of the imaging lens systems according to the fourth to eighth examples can include the features according to the second example. As another example, the first lens group, the optical path conversion element, and the second lens group of the imaging lens systems according to the fourth to eighth examples can also include the features according to the third example.

[0142] First, the imaging lens system according to the fourth example will be described with reference to Figure 4 the following.

[0143] The imaging lens system 100 may include a plurality of lens groups. For example, the imaging lens system 100 may include a first lens group LG1 and a second lens group LG2. The first lens group LG1 and the second lens group LG2 may be arranged sequentially from the object side. The first lens group LG1 and the second lens group LG2 may include one or more lenses. The imaging lens system 100 may include an optical path conversion element. As an example, the imaging lens system 100 may include a prism P disposed between the first lens group LG1 and the second lens group LG2.

[0144] The first lens group LG1 may include a first lens 110. The first lens 110 has positive refractive power, and has a convex object-side surface and a concave image-side surface.

[0145] The second lens group LG2 may include a second lens 120 and a third lens 130. The second lens 120 has positive refractive power and has a concave object-side surface and a convex image-side surface. The third lens 130 has negative refractive power and has a concave object-side surface and a convex image-side surface.

[0146] In addition to the first lens 110 to the third lens 130, the imaging lens system 100 may further include other optical elements. For example, the imaging lens system 100 may further include an aperture (not shown), a filter IF, and an imaging surface IP. The aperture may be disposed between the second lens 120 and the third lens 130. The filter IF may be disposed between the third lens 130 and the imaging surface IP. The imaging surface IP may be formed in a position where light incident from the first lens 110 to the third lens 130 forms an image. For example, the imaging surface IP may be formed on one surface of the image sensor IS of the camera module, or on an optical element disposed inside the image sensor IS.

[0147] Table 1 shows lens characteristics of the imaging lens system according to the present example, and Table 2 shows aspherical surface values ​​of the imaging lens system according to the present example.

[0148] Table 1

[0149] Face number Division Radius of curvature Thickness / distance Refractive Index Abbe number Effective radius S1 First lens 10.0000 1.5000 1.535 55.73 4.403 S2 25.0000 1.0000 4.157 S3 Prism endless 3.0000 1.717 29.50 3.943 S4 endless 3.2000 1.717 29.50 3.375 S5 endless 2.5000 2.769 S6 Second lens -90.8444 1.0000 1.544 55.99 1.934 S7 Aperture -6.9210 0.7000 1.773 S8 The third lens -5.3215 1.0000 1.639 23.49 1.809 S9 -8.6124 10.0000 1.997 S10 Optical Filters endless 0.2100 1.517 64.20 S11 endless 1.5386 S12 Imaging surface endless 0.0000

[0150] Table 2

[0151] Face number k A B C D S1 0 -4.4040E-05 -8.8602E-07 -1.2890E-08 0 S2 0 4.2349E-05 8.1645E-07 1.0517E-08 0 S6 0 -4.7277E-05 8.3687E-06 1.2894E-06 -9.2948E-08 S7 0 1.8401E-05 -1.0595E-05 -1.3200E-06 2.7045E-07 S8 0 -3.2635E-06 1.2979E-05 1.6545E-06 -4.1610E-07 S9 0 1.1093E-05 -7.9085E-06 -2.8644E-07 4.7632E-07

[0152] Next, we will refer to Figure 5 An imaging lens system according to a fifth example is described.

[0153] The imaging lens system 200 may include a plurality of lens groups. For example, the imaging lens system 200 may include a first lens group LG1 and a second lens group LG2. The first lens group LG1 and the second lens group LG2 may be arranged sequentially from the object side. The first lens group LG1 and the second lens group LG2 may include one or more lenses. The imaging lens system 200 may include an optical path conversion element. As an example, the imaging lens system 200 may include a prism P disposed between the first lens group LG1 and the second lens group LG2.

[0154] The first lens group LG1 may include a first lens 210. The first lens 210 has positive refractive power, and has a convex object-side surface and a concave image-side surface.

[0155] The second lens group LG2 may include a second lens 220 and a third lens 230. The second lens 220 has positive refractive power and has a concave object-side surface and a convex image-side surface. The third lens 230 has negative refractive power and has a concave object-side surface and a convex image-side surface.

[0156] In addition to the first lens 210 to the third lens 230, the imaging lens system 200 may further include other optical elements. For example, the imaging lens system 200 may further include an aperture (not shown), a filter IF, and an imaging surface IP. The aperture may be disposed between the second lens 220 and the third lens 230. The filter IF may be disposed between the third lens 230 and the imaging surface IP. The imaging surface IP may be formed in a position where light incident from the first lens 210 to the third lens 230 forms an image. For example, the imaging surface IP may be formed on one surface of the image sensor IS of the camera module, or on an optical element disposed inside the image sensor IS.

[0157] Table 3 shows lens characteristics of the imaging lens system according to the present example, and Table 4 shows aspherical surface values ​​of the imaging lens system according to the present example.

[0158] Table 3

[0159] Face number Division Radius of curvature Thickness / distance Refractive Index Abbe number Effective radius S1 First lens 11.4946 1.5000 1.535 55.73 4.063 S2 24.9858 0.8000 3.795 S3 Prism endless 3.0000 1.717 29.50 3.657 S4 endless 3.3000 1.717 29.50 3.179 S5 endless 2.0000 2.652 S6 Second lens -47.6350 1.0000 1.544 55.99 2.103 S7 Aperture -5.9554 0.7000 1.990 S8 The third lens -4.6803 1.0000 1.639 23.49 1.997 S9 -7.2662 11.0000 2.198 S10 Optical Filters endless 0.2100 1.517 64.20 S11 endless 2.2406 S12 Imaging surface endless 0.0000

[0160] Table 4

[0161] Face number k A B C D S1 0 -6.5528E-05 -1.3505E-06 -4.0319E-08 0 S2 0 6.2850E-05 1.3454E-06 6.3285E-08 0 S6 0 -2.8941E-05 1.1860E-05 8.4266E-07 -4.2724E-07 S7 0 -2.0255E-06 -1.2545E-05 -9.3667E-07 4.3281E-07 S8 0 2.7047E-05 1.9673E-05 3.5298E-06 3.3037E-07 S9 0 -5.2100E-06 -7.4473E-06 3.0452E-07 5.7464E-07

[0162] Next, we will refer to Figure 6 An imaging lens system according to a sixth example is described.

[0163] The imaging lens system 300 may include a plurality of lens groups. For example, the imaging lens system 300 may include a first lens group LG1 and a second lens group LG2. The first lens group LG1 and the second lens group LG2 may be arranged sequentially from the object side. The first lens group LG1 and the second lens group LG2 may include one or more lenses. The imaging lens system 300 may include an optical path conversion element. As an example, the imaging lens system 300 may include a prism P disposed between the first lens group LG1 and the second lens group LG2.

[0164] The first lens group LG1 may include a first lens 310. The first lens 310 has positive refractive power, and has a convex object-side surface and a concave image-side surface.

[0165] The second lens group LG2 may include a second lens 320, a third lens 330, and a fourth lens 340. The second lens 320 has positive refractive power, and has a concave object-side surface and a convex image-side surface. The third lens 330 has negative refractive power, and has a concave object-side surface and a convex image-side surface. The fourth lens 340 has negative refractive power, and has a concave object-side surface and a convex image-side surface.

[0166] In addition to the first lens 310 to the fourth lens 340, the imaging lens system 300 may further include other optical elements. For example, the imaging lens system 300 may further include an aperture (not shown), a filter IF, and an imaging surface IP. The aperture may be disposed between the second lens 320 and the third lens 330. The filter IF may be disposed between the fourth lens 340 and the imaging surface IP. The imaging surface IP may be formed in a position where light incident from the first lens 310 to the fourth lens 340 forms an image. For example, the imaging surface IP may be formed on one surface of the image sensor IS of the camera module, or on an optical element disposed inside the image sensor IS.

[0167] Table 5 shows lens characteristics of the imaging lens system according to the present example, and Table 6 shows aspherical surface values ​​of the imaging lens system according to the present example.

[0168] Table 5

[0169] Face number Division Radius of curvature Thickness / distance Refractive Index Abbe number Effective radius S1 First lens 15.9944 1.5000 1.535 55.73 4.069 S2 34.5390 0.6000 3.813 S3 Prism endless 2.8000 1.717 29.50 3.726 S4 endless 2.9500 1.717 29.50 3.341 S5 endless 3.0000 2.935 S6 Second lens -92.4220 1.0000 1.544 55.99 2.221 S7 Aperture -5.4456 0.7000 2.138 S8 The third lens -4.3148 1.0000 1.639 23.49 2.121 S9 -6.5954 0.5000 2.325 S10 The fourth lens -10.0592 1.0000 1.661 20.38 2.369 S11 -11.0292 10.0000 2.511 S12 Optical Filters endless 0.2100 1.517 64.20 S13 endless 3.5946 S14 Imaging surface endless 0.0000

[0170] Table 6

[0171]

[0172]

[0173] Next, we will refer to Figure 7 An imaging lens system according to a seventh example is described.

[0174] The imaging lens system 400 may include a plurality of lens groups. For example, the imaging lens system 400 may include a first lens group LG1 and a second lens group LG2. The first lens group LG1 and the second lens group LG2 may be arranged sequentially from the object side. The first lens group LG1 and the second lens group LG2 may include one or more lenses. The imaging lens system 400 may include an optical path conversion element. As an example, the imaging lens system 400 may include a prism P disposed between the first lens group LG1 and the second lens group LG2.

[0175] The first lens group LG1 may include a first lens 410. The first lens 410 has positive refractive power, and has a convex object-side surface and a concave image-side surface.

[0176] The second lens group LG2 may include a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, and a sixth lens 460. The second lens 420 has a positive refractive power and has a convex object side surface and a convex image side surface. The third lens 430 has a negative refractive power and has a concave object side surface and a convex image side surface. The fourth lens 440 has a positive refractive power and has a concave object side surface and a convex image side surface. The fifth lens 450 has a negative refractive power and has a convex object side surface and a concave image side surface. The sixth lens 460 has a positive refractive power and has a convex object side surface and a concave image side surface.

[0177] In addition to the first lens 410 to the sixth lens 460, the imaging lens system 400 may further include other optical elements. For example, the imaging lens system 400 may further include an aperture (not shown), a filter IF, and an imaging surface IP. The aperture may be disposed between the second lens 420 and the third lens 430. The filter IF may be disposed between the sixth lens 460 and the imaging surface IP. The imaging surface IP may be formed in a position where light incident from the first lens 410 to the sixth lens 460 forms an image. For example, the imaging surface IP may be formed on one surface of the image sensor IS of the camera module, or on an optical element disposed inside the image sensor IS.

[0178] Table 7 shows lens characteristics of the imaging lens system according to the present example, and Table 8 shows aspherical surface values ​​of the imaging lens system according to the present example.

[0179] Table 7

[0180]

[0181]

[0182] Table 8

[0183] Face number k A B C D S1 0 -8.6837E-05 -9.8569E-07 -1.2347E-07 0 S2 0 5.9549E-05 2.0603E-07 1.9592E-07 0 S6 0 1.8345E-04 8.2741E-06 -1.3488E-06 -4.7470E-07 S7 0 -1.4682E-04 -4.9832E-06 7.1204E-07 1.9086E-07 S8 0 2.2890E-04 3.6276E-05 8.6168E-06 2.3967E-06 S9 0 -1.4794E-04 -3.2060E-06 3.4719E-06 1.4639E-06 S10 0 -2.1454E-04 -1.7495E-05 -1.1792E-06 -4.7828E-07 S11 0 2.8802E-04 2.5376E-05 1.8281E-06 -7.8154E-08 S12 0 2.6613E-05 6.9002E-07 2.5975E-07 -6.1788E-09 S13 0 -2.2587E-05 -3.1238E-06 -7.7703E-07 -6.5644E-08 S14 0 3.6841E-05 6.4672E-06 1.0073E-06 5.2552E-08 S15 0 3.6841E-05 6.4672E-06 1.0073E-06 5.2552E-08

[0184] Next, we will refer to Figure 8 An imaging lens system according to an eighth example is described.

[0185] The imaging lens system 500 may include a plurality of lens groups. For example, the imaging lens system 500 may include a first lens group LG1 and a second lens group LG2. The first lens group LG1 and the second lens group LG2 may be arranged sequentially from the object side. The first lens group LG1 and the second lens group LG2 may include one or more lenses. The imaging lens system 500 may include an optical path conversion element. As an example, the imaging lens system 500 may include a prism P disposed between the first lens group LG1 and the second lens group LG2.

[0186] The first lens group LG1 may include a first lens 510, a second lens 520, and a third lens 530. The first lens 510 has negative refractive power, and has a convex object-side surface and a concave image-side surface. The second lens 520 has negative refractive power, and has a convex object-side surface and a convex image-side surface. The third lens 530 has positive refractive power, and has a convex object-side surface and a convex image-side surface.

[0187] The second lens group LG2 may include a fourth lens 540, a fifth lens 550, and a sixth lens 560. The fourth lens 540 has positive refractive power, and has a convex object-side surface and a concave image-side surface. The fifth lens 550 has negative refractive power, and has a convex object-side surface and a concave image-side surface. The sixth lens 560 has positive refractive power, and has a convex object-side surface and a concave image-side surface.

[0188] In addition to the first lens 510 to the sixth lens 560, the imaging lens system 500 may further include other optical elements. For example, the imaging lens system 500 may further include an aperture (not shown), a filter IF, and an imaging surface IP. The aperture may be disposed between the fourth lens 540 and the fifth lens 550. The filter IF may be disposed between the sixth lens 560 and the imaging surface IP. The imaging surface IP may be formed in a position where light incident from the first lens 510 to the sixth lens 560 forms an image. For example, the imaging surface IP may be formed on one surface of the image sensor IS of the camera module, or on an optical element disposed inside the image sensor IS.

[0189] Table 9 shows lens characteristics of the imaging lens system according to the present example, and Table 10 shows aspherical surface values ​​of the imaging lens system according to the present example.

[0190] Table 9

[0191] Face number Division Radius of curvature Thickness / distance Refractive Index Abbe number Effective radius S1 First lens 6.9396 0.3000 1.535 55.73 3.870 S2 6.5278 0.2473 3.547 S3 Second lens 7.5817 0.3000 1.639 23.49 2.355 S4 5.1562 0.1692 2.303 S5 The third lens 4.9781 1.0835 1.535 55.73 2.269 S6 28.0028 0.4000 2.387 S7 Prism endless 2.3000 1.717 29.50 3.480 S8 endless 2.6000 1.717 29.50 3.141 S9 endless 1.5000 2.774 S10 The fourth lens 4.4324 0.5000 1.544 55.99 2.393 S11 Aperture 6.8425 0.3000 2.648 S12 Fifth lens 3.3432 0.5000 1.639 23.49 2.767 S13 2.4215 0.5000 2.566 S14 The sixth lens 3.0382 0.7000 1.639 23.49 2.623 S15 2.8618 4.0000 2.545 S16 Optical Filters endless 0.2100 1.517 64.20 S17 endless 4.1290 S18 Imaging surface endless 0.0000

[0192] Table 10

[0193]

[0194]

[0195] Table 11 shows characteristic values ​​of imaging lens systems according to the fourth example to the eighth example.

[0196] Table 11

[0197] Division Fourth Example Fifth example Sixth Example Example 7 Example 8 f1 30.115 38.321 54.175 215.989 -275.690 f2 13.714 12.407 10.594 9.325 -26.494 f3 -24.718 -24.229 -23.550 -18.003 11.138 f4 - - -293.511 184.414 21.556 f5 - - - -33.511 -17.430 f6 - - - 36.635 140.872 TTL 25.649 26.751 28.855 25.686 19.739 f 18.532 18.610 18.610 18.610 17.000 Ih 7.150 7.150 7.150 7.150 7.150 fG1 30.115 38.321 54.175 215.988 21.573 fG2 32.186 27.007 22.715 18.630 596.745 <![CDATA[L A1 ]]> 4.403 4.063 4.069 3.870 3.870 <![CDATA[L A2 ]]> 4.403 4.063 4.069 3.870 3.870 <![CDATA[P A1 ]]> 3.000 3.000 2.800 3.000 2.300 <![CDATA[P A2 ]]> 3.200 3.300 2.950 3.250 2.600 <![CDATA[P B1 ]]> 3.000 3.000 2.800 3.000 2.300 <![CDATA[P B2 ]]> 3.200 3.300 2.950 3.250 2.600 <![CDATA[L B1 ]]> 1.934 2.103 2.221 2.355 2.393 <![CDATA[L B2 ]]> 1.934 2.103 2.221 2.355 2.393

[0198] Table 12 and Table 13 are conditional expression values ​​of the imaging lens systems according to the fourth example to the eighth example.

[0199] Table 12

[0200] Conditional Expressions Fourth Example Fifth example Sixth Example Example 7 Example 8 DPR / DPF 1.067 1.100 1.054 1.083 1.130 <![CDATA[L A1 / L A2 ]]> 1.000 1.000 1.000 1.000 1.000 <![CDATA[L B1 / L B2 ]]> 1.000 1.000 1.000 1.000 1.000 <![CDATA[P A1 / P A2 ]]> 0.938 0.909 0.949 0.923 0.885 <![CDATA[P B1 / P B2 ]]> 0.938 0.909 0.949 0.923 0.885 DLP 1.000 0.800 0.600 1.200 0.247 DPL 2.500 2.000 3.000 2.000 1.500 (DLP+DPF) / (DPL+DPR) 0.702 0.717 0.571 0.800 0.659 fG1 / DLPL 3.105 4.211 5.794 22.856 3.173

[0201] Table 13

[0202]

[0203]

[0204] According to one or more embodiments, one or more examples, or a combination thereof described in the present application, the present disclosure can reduce the flicker phenomenon caused by an optical path conversion element.

[0205] Although specific examples have been shown and described above, after understanding the disclosure of the present application, it is obvious that various changes in form and detail can be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described in this application are considered to be descriptive only, not for limiting purposes. The description of the features or aspects in each example is considered to be applicable to similar features or aspects in other examples. If the described techniques are performed in a different order, and / or if the components in the described system, architecture, device or circuit are combined in a different manner, and / or replaced or supplemented by other components or their equivalents, suitable results can be obtained. Therefore, the scope of the present disclosure is not limited by the detailed description, but by the claims and their equivalents, and all changes within the scope of the claims and their equivalents will be interpreted as included in the present disclosure.

Claims

1. An imaging lens system, comprising: A first lens group, an optical path conversion element, and a second lens group are sequentially arranged from the object side; as well as an image sensor, an imaging surface being formed on the image sensor, Wherein, the optical axis of the second lens group is eccentrically arranged in one direction relative to the geometric optical axis of the optical path conversion element.

2. The imaging lens system according to claim 1, wherein: The optical axis of the first lens group is eccentrically arranged in one direction relative to the geometric optical axis of the optical path conversion element.

3. The imaging lens system according to claim 1, wherein: The first lens group includes at least one lens.

4. The imaging lens system according to claim 1, wherein: In the first lens group, the front lens disposed closest to the optical path conversion element has positive refractive power.

5. The imaging lens system according to claim 1, wherein: In the first lens group, the frontmost lens disposed closest to the object has a convex object-side surface.

6. The imaging lens system according to claim 1, wherein: The second lens group includes a plurality of lenses.

7. The imaging lens system according to claim 1, wherein: In the second lens group, a rear lens disposed closest to the optical path conversion element has positive refractive power.

8. The imaging lens system according to claim 1, wherein: In the second lens group, a rearmost lens disposed closest to the imaging plane has positive refractive power or has a convex image-side surface.

9. The imaging lens system according to claim 1, wherein: 1.0 <DPR / DPF, Wherein, DPF is the distance of the light path extending from the object side surface of the optical path conversion element to the reflection surface of the optical path conversion element along the first optical axis of the first lens group, and DPR is the distance of the light path extending from the reflection surface of the optical path conversion element to the image side surface of the optical path conversion element along the second optical axis of the second lens group.

10. An imaging lens system, comprising: A first lens group, an optical path conversion element, and a second lens group are sequentially arranged from the object side; as well as an image sensor, an imaging surface being formed on the image sensor, Among them, 0.060<(P B2 -P B1 ) / L B1 <0.20, Among them, P B1 is the shortest distance from the point where the optical axis of the second lens group intersects the exit surface of the optical path conversion element to one side of the exit surface, P B2 is the shortest distance from the point where the optical axis of the second lens group intersects the exit surface of the optical path conversion element to the other side of the exit surface, and L B1 is the effective radius of the object-side surface of the rear lens in the second lens group that is closest to the exit surface.

11. The imaging lens system according to claim 10, wherein: In the first lens group, the front lens disposed closest to the optical path conversion element has positive refractive power.

12. The imaging lens system according to claim 10, wherein: In the first lens group, the frontmost lens disposed closest to the object has a convex object-side surface.

13. The imaging lens system according to claim 10, wherein: The second lens group includes a plurality of lenses.

14. The imaging lens system according to claim 10, wherein: In the second lens group, a rear lens disposed closest to the optical path conversion element has positive refractive power.

15. The imaging lens system according to claim 10, wherein: In the second lens group, a rearmost lens disposed closest to the imaging plane has positive refractive power or has a convex image-side surface.

16. The imaging lens system according to claim 10, wherein: 2.0 <f / ImgH<3.60, Wherein, f is the focal length of the imaging lens system, and ImgH is the height of the imaging plane.

17. An imaging lens system, comprising: A first lens group, an optical path conversion element, and a second lens group are sequentially arranged from the object side; as well as an image sensor, an imaging surface being formed on the image sensor, The optical axis of the second lens group intersects with the optical axis of the first lens group on the reflective surface at a position spaced apart from the center of the reflective surface of the optical path conversion element.

18. The imaging lens system according to claim 17, wherein: The center is the geometrical optical axis of the optical path conversion element.

19. The imaging lens system according to claim 17, wherein: The optical axis of the second lens group intersects the optical axis of the first lens group at a position closer to the first lens group than the center.

20. The imaging lens system of claim 17, wherein: The optical axis of the second lens group intersects the optical axis of the first lens group at a position farther from the second lens group than the center.

Images