Imaging lens system

Abstract

The imaging lens system includes: a first lens having positive refractive power; a second lens having refractive power; a third lens having positive refractive power; a fourth lens having refractive power and a convex image side surface in a paraxial region thereof; a fifth lens having refractive power; a sixth lens having refractive power; a seventh lens having refractive power and a convex image side surface in a paraxial region thereof; and an eighth lens having refractive power, a convex object side surface in a paraxial region thereof, and an image side surface with an inflection point, in which the first to eighth lenses are sequentially arranged along an optical axis of the imaging lens system from the object side of the imaging lens system toward an imaging surface of the imaging lens system, and-5.0 lt; f6 / flt; 2.0, where f6 is the focal length of the sixth lens, and f is the focal length of the imaging lens system.

Description

[0001] Cross - reference to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10 - 2024 - 0096679, filed on July 22, 2024, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. Technical field

[0003] The present disclosure relates to an imaging lens system having reduced chromatic aberration. Background art

[0004] A camera module may be mounted on an electronic device to capture still images or record moving images. For example, the camera module may be mounted on a mobile phone, a laptop computer, a game console, or other electronic devices.

[0005] As the performance of electronic devices including camera modules improves, the demand for camera modules with high performance, high resolution, and small size has grown. For example, the image sensors of camera modules have gradually become larger to achieve high - resolution camera modules. However, the enlargement of image sensors not only hinders the miniaturization of camera modules but also increases the aberration of the imaging lens system of camera modules. Summary of the utility model

[0006] The provision of this Summary of the utility model section aims to introduce, in a brief form, a selection of concepts, which will be further described in the Detailed implementation section below. This Summary of the utility model section is not intended to identify the key features or essential features of the claimed subject matter, nor is it intended to be used to assist in determining the scope of the claimed subject matter.

[0007] In one general aspect, an imaging lens system includes: a first lens having a positive refractive power; a second lens having a refractive power; a third lens having a positive refractive power; a fourth lens having a refractive power and a convex image side surface in its paraxial region; a fifth lens having a refractive power; a sixth lens having a refractive power; a seventh lens having a refractive power and a convex image side surface in its paraxial region; and an eighth lens having a refractive power, a convex object side surface in its paraxial region, and an image side surface with an inflection point, wherein the first lens to the eighth lens are arranged in order along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system, and the imaging lens system satisfies the conditional expression - 5.0 < f6 / f < 2.0, where f6 is the focal length of the sixth lens, and f is the focal length of the imaging lens system.

[0008] The first lens may have a convex object side surface in its paraxial region.

[0009] The second lens may have a convex object side surface in its paraxial region.

[0010] The third lens may have a convex object side surface in its paraxial region.

[0011] The fourth lens may have a concave object side surface in its paraxial region.

[0012] The fifth lens may have a convex object side surface in its paraxial region.

[0013] The sixth lens may have a convex object side surface in its paraxial region.

[0014] The sixth lens may have a convex image side surface in its paraxial region.

[0015] The seventh lens may have a concave object side surface in its paraxial region.

[0016] The image side surface of the eighth lens may be concave in its paraxial region.

[0017] In another general aspect, an imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens that are arranged in sequence along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system, wherein two adjacent lenses among the first lens to the eighth lens are joined to each other, and the imaging lens system satisfies the conditional expression 0.36 < sumAG / f < 0.50, where sumAG is the sum of the air gaps along the optical axis between the first lens and the eighth lens, and f is the focal length of the imaging lens system.

[0018] The first lens may have a convex object side surface in its paraxial region.

[0019] The second lens may have a convex object side surface in its paraxial region.

[0020] The third lens may have a convex object side surface in its paraxial region.

[0021] The fourth lens may have a concave object side surface in its paraxial region.

[0022] The fifth lens may have a convex object side surface in its paraxial region.

[0023] The sixth lens may have a convex object side surface in its paraxial region.

[0024] The sixth lens may have a convex image side surface in its paraxial region.

[0025] The seventh lens may have a concave object side surface in its paraxial region.

[0026] The seventh lens may have a convex image-side surface in its paraxial region.

[0027] Other features and aspects will become apparent from the accompanying drawings and the detailed description below. Attached Figure Description

[0028] Figure 1 This is a configuration diagram of an imaging lens system according to a first embodiment of the present disclosure.

[0029] Figure 2 It shows Figure 1 The aberration curves of the imaging lens system are shown.

[0030] Figure 3 This is a configuration diagram of an imaging lens system according to a second embodiment of the present disclosure.

[0031] Figure 4 It shows Figure 3 The aberration curves of the imaging lens system are shown.

[0032] Figure 5 This is a configuration diagram of an imaging lens system according to a third embodiment of the present disclosure.

[0033] Figure 6 It shows Figure 5 The aberration curves of the imaging lens system are shown.

[0034] Figure 7 This is a configuration diagram of an imaging lens system according to the fourth embodiment of this disclosure.

[0035] Figure 8 It shows Figure 7 The aberration curves of the imaging lens system are shown.

[0036] Figure 9 This is a configuration diagram of an imaging lens system according to the fifth embodiment of this disclosure.

[0037] Figure 10 It shows Figure 9 The aberration curves of the imaging lens system are shown.

[0038] Figure 11 This is a configuration diagram of an imaging lens system according to the sixth embodiment of this disclosure.

[0039] Figure 12 It shows Figure 11 The aberration curves of the imaging lens system are shown.

[0040] Figure 13 This is a configuration diagram of an imaging lens system according to the seventh embodiment of this disclosure.

[0041] Figure 14 It shows Figure 13 The aberration curves of the imaging lens system are shown.

[0042] Figure 15 This is a configuration diagram of an imaging lens system according to the eighth embodiment of this disclosure.

[0043] Figure 16 It shows Figure 15 The aberration curves of the imaging lens system are shown.

[0044] Figure 17 This is a configuration diagram of an imaging lens system according to the ninth embodiment of this disclosure.

[0045] Figure 18 It shows Figure 17 The aberration curves of the imaging lens system are shown.

[0046] Figure 19 This is a configuration diagram of an imaging lens system according to the tenth embodiment of this disclosure.

[0047] Figure 20 It shows Figure 19 The aberration curves of the imaging lens system are shown.

[0048] Figure 21 This is a configuration diagram of an imaging lens system according to the eleventh embodiment of this disclosure.

[0049] Figure 22 It shows Figure 21 The aberration curves of the imaging lens system are shown.

[0050] Figure 23 This is a configuration diagram of an imaging lens system according to the twelfth embodiment of this disclosure.

[0051] Figure 24 It shows Figure 23 The aberration curves of the imaging lens system are shown.

[0052] Figure 25 This is a configuration diagram of an imaging lens system according to the thirteenth embodiment of this disclosure.

[0053] Figure 26 It shows Figure 25 The aberration curves of the imaging lens system are shown.

[0054] Figure 27 This is a configuration diagram of an imaging lens system according to the fourteenth embodiment of this disclosure.

[0055] Figure 28 It shows Figure 27 The aberration curves of the imaging lens system are shown.

[0056] Figure 29 This is a configuration diagram of an imaging lens system according to the fifteenth embodiment of this disclosure.

[0057] Figure 30 It shows Figure 29 The aberration curves of the imaging lens system are shown.

[0058] 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

[0059] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding the disclosure of this application. 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 the disclosure of this application. Furthermore, for clarity and conciseness, descriptions of features well-known in the art may be omitted.

[0060] The features described herein may be implemented in various 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 the disclosure of this application.

[0061] Throughout this specification, 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.

[0062] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more items.

[0063] 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.

[0064] Spatial relative terms such as “above,” “above,” “below,” and “under” 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 “under” 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.

[0065] 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 terms “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, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0066] In the lens configuration diagrams in the accompanying drawings of this application, the thickness, size, and shape of the lenses may be slightly exaggerated for ease of explanation, and specifically, the spherical or aspherical shapes shown in the lens configuration diagrams are merely illustrative and are not limited to the shapes shown.

[0067] In this specification, the first lens refers to the lens closest to the object (or subject), and the eighth lens refers to the lens closest to the imaging surface (or image sensor).

[0068] In this specification, the radii of curvature of the lens or other element surface, the thickness of the lens or other element, the distance from the object-side surface of the first lens to the imaging plane (TTL), the distance from the image-side surface of the eighth lens to the imaging plane (BFL), the image height (IMG HT), the focal length of the lens or imaging lens system, and the air gap between lenses or other elements are expressed in millimeters (mm). The field of view (FOV) of the imaging lens system is expressed in degrees. The f-number of the imaging lens system is dimensionless.

[0069] The thickness of the components, the air gap between components, TTL, and BFL are measured along the optical axis of the lens.

[0070] Furthermore, in the description of lens shape, stating "a surface is convex" means that the paraxial region of that surface is convex, and stating "a surface is concave" means that the paraxial region of that surface is concave.

[0071] Therefore, even when one surface of the lens is convex, the edge portion of that surface can be concave. Similarly, even when one surface of the lens is concave, the edge portion of that surface can be convex.

[0072] The paraxial region of a lens surface is a very narrow area on the lens surface that is close to the optical axis.

[0073] More specifically, 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. In the paraxial region of the lens surface, the light rays incident on the lens surface form a small angle θ with the optical axis, and the approximations sinθ≈θ, tanθ≈θ, and cosθ≈1 are valid.

[0074] An imaging lens system according to a first aspect of this disclosure may include a plurality of lenses. For example, an imaging lens system according to the first aspect may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system.

[0075] The imaging lens system according to the first aspect may include lenses having positive refractive power. For example, in the imaging lens system according to the first aspect, the first lens and the third lens may have positive refractive power.

[0076] The imaging lens system according to the first aspect may include a lens having a convex surface in its paraxial region. For example, in the imaging lens system according to the first aspect, the fourth lens may have a convex image-side surface in its paraxial region, the sixth lens may have a convex image-side surface in its paraxial region, and the seventh lens may have a convex image-side surface in its paraxial region.

[0077] The imaging lens system according to the first aspect may satisfy a conditional expression. For example, the imaging lens system according to the first aspect may satisfy the conditional expression -5.0 < f6 / f < 2.0, where f6 is the focal length of the sixth lens, and f is the focal length of the imaging lens system.

[0078] The imaging lens system according to the second aspect of the present disclosure may include a plurality of lenses. For example, the imaging lens system according to the second aspect may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens that are sequentially arranged along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system.

[0079] In the imaging lens system according to the second aspect, a pair of lenses may be joined to each other. For example, in the imaging lens system according to the second aspect, the image-side surface of the first lens and the object-side surface of the second lens may be joined to each other. As another example, in the imaging lens system according to the second aspect, the image-side surface of the second lens and the object-side surface of the third lens may be joined to each other. As another example, in the imaging lens system according to the second aspect, the image-side surface of the fourth lens and the object-side surface of the fifth lens may be joined to each other. The surfaces of the lenses joined to each other may be spherical or aspherical, but the shapes of these surfaces are not limited thereto.

[0080] The imaging lens system according to the second aspect may satisfy a conditional expression. For example, the imaging lens system according to the second aspect may satisfy the conditional expression 0.36 < sumAG / f < 0.50, where sumAG is the sum of the air gaps along the optical axis between the first lens and the eighth lens (i.e., the distance along the optical axis from the image-side surface of the first lens to the object-side surface of the second lens, the distance along the optical axis from the image-side surface of the second lens to the object-side surface of the third lens, the distance along the optical axis from the image-side surface of the third lens to the object-side surface of the fourth lens, the distance along the optical axis from the image-side surface of the fourth lens to the object-side surface of the fifth lens, the distance along the optical axis from the image-side surface of the fifth lens to the object-side surface of the sixth lens, the distance along the optical axis from the image-side surface of the sixth lens to the object-side surface of the seventh lens, and the distance along the optical axis from the image-side surface of the seventh lens to the object-side surface of the eighth lens), and f is the focal length of the imaging lens system.

[0081] In the imaging lens system according to the second aspect, the cemented lens may have specific characteristics. For example, the cemented surface of the cemented lens (i.e., the image side of the first lens and the object side of the second lens, or the image side of the second lens and the object side of the third lens, or the image side of the fourth lens and the object side of the fifth lens) may be aspherical or spherical.

[0082] In addition, the cemented lenses may be joined to each other by a specific material. For example, the cemented lenses may be joined to each other by an adhesive having a specific refractive index. The refractive index of the adhesive may be greater than the minimum refractive index of the lenses among the cemented lenses and less than the maximum refractive index of the lenses among the cemented lenses. As a specific example, when the cemented lenses are the first lens and the second lens and the refractive index of the first lens is less than the refractive index of the second lens, the refractive index of the adhesive may be greater than the refractive index of the first lens and less than the refractive index of the second lens. The adhesive may be applied as an adhesive layer having a specific thickness. For example, the thickness of the adhesive layer may be in the range of 1.0 μm to 50 μm.

[0083] The imaging lens system according to the third aspect of the present disclosure may include first to eighth lenses arranged in order from the object side to the imaging surface of the imaging lens system along the optical axis of the imaging lens system, and may satisfy any one or any combination of any two or more of the following conditional expressions 1 to 15:

[0084] 5 < |Va - Vb| < 50 (Conditional expression 1)

[0085] 0.01 < |Na - Nb| < 0.3 (Conditional expression 2)

[0086] 0 ≤ |fa / Va - fb / Vb| < 2.0 (Conditional expression 3)

[0087] 0.5 < f1 / f < 2.0 (Conditional expression 4)

[0088] -3.0 < f2 / f < -1.0 (Conditional expression 5)

[0089] 0 < f3 / f < 5.0 (Conditional expression 6)

[0090] -3.0 < f4 / (f × 100) < 3.0 (Conditional expression 7)

[0091] -7.0 < f5 / f < 10.0 (Conditional expression 8)

[0092] -5.0 < f6 / f < 2.0 (Conditional expression 9)

[0093] -8.0 < f7 / f < 12 (Conditional expression 10)

[0094] -2.0 < f8 / f < 0 (Conditional expression 11)

[0095] 1.0 < TTL / f < 2.0 (Conditional expression 12)

[0096] 0 < BFL / f < 1.0 (Conditional expression 13)

[0097] 0.5 < TTL / (2 × IMG HT) < 0.8 (Conditional expression 14)

[0098] 1.0 < f-number < 3.0 (Conditional expression 15)

[0099] In the above conditional expressions 1 to 15, Va is the Abbe number of the object-side lens of the combined lens, Vb is the Abbe number of the image-side lens of the combined lens, Na is the refractive index of the object-side lens of the combined lens, Nb is the refractive index of the image-side lens of the combined lens, fa is the focal length of the object-side lens of the combined lens, fb is the focal length of the image-side lens of the combined lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f7 is the focal length of the seventh lens, f8 is the focal length of the eighth lens, f is the focal length of the imaging lens system, TTL is the distance along the optical axis from the object surface of the first lens to the imaging surface, BFL is the distance along the optical axis from the image surface of the eighth lens to the imaging surface, IMG HT is the height of the image on the imaging surface and is equal to half of the diagonal length of the imaging surface, and the f-number is the f-number of the imaging lens system.

[0100] Among the above conditional expressions 1 to 15, the conditional expression 3 including the Abbe number and refractive index of the combined lens is the numerical range for improving the chromatic aberration of the imaging lens system. For example, for an imaging lens system outside the numerical range of 0 ≤ |fa / Va - fb / Vb| < 2.0 (conditional expression 3), it may be difficult to improve the chromatic aberration of the imaging lens system.

[0101] Among the above conditional expressions 1 to 15, the conditional expressions 12 to 14 including the focal length f of the imaging lens system are the numerical ranges for miniaturization and manufacturability of the imaging lens system. For example, an imaging lens system that does not satisfy the conditional expressions 0.5 < f1 / f < 2.0, 1.0 < TTL / f < 2.0, and 0 < BFL / f < 1.0 (conditional expressions 12 to 14) may be difficult to miniaturize or manufacture.

[0102] The ranges of the above conditional expressions 8 to 10 can be further limited to the following conditional expressions 16 to 18, and the imaging lens system according to the third aspect can satisfy any one or any two or more combinations of the following conditional expressions 16 to 18:

[0103] -7.0 < f5 / f < 3.0 (Conditional Expression 16)

[0104] 0 < f6 / f < 2.0 (Conditional Expression 17)

[0105] -7.0 < f7 / f < 0 (Conditional Expression 18)

[0106] The imaging lens system according to the fourth aspect of the present disclosure may include a first lens to an eighth lens arranged in sequence from the object side to the imaging surface of the imaging lens system along the optical axis of the imaging lens system, and may satisfy any one or any combination of any two or more of the following conditional expressions 19 to 24:

[0107] -2.0 < f1 / f8 < -0.6 (Conditional Expression 19)

[0108] -2.0 < f2 / f3 < -0.2 (Conditional Expression 20)

[0109] -1.60 < f5 / f7 < 1.60 (Conditional Expression 21)

[0110] -2.40 < f6 / f8 < 4.60 (Conditional Expression 22)

[0111] -2.6 < f1 / f8 + f5 / f7 < -0.10 (Conditional Expression 23)

[0112] -2.60 < f2 / f3 + f6 / f8 < -1.60 (Conditional Expression 24)

[0113] The ranges of the above conditional expressions 19 to 22 may be further limited to the following conditional expressions 25 to 28, and the imaging lens system according to the fourth aspect may satisfy any one or any combination of any two or more of the following conditional expressions 25 to 28:

[0114] -1.8 < f1 / f8 < -1.2 (Conditional Expression 25)

[0115] -1.6 < f2 / f3 < -0.4 (Conditional Expression 26)

[0116] -0.40 < f5 / f7 < 1.20 (Conditional Expression 27)

[0117] -1.40 < f6 / f8 < -0.80 (Conditional Expression 28)

[0118] The above conditional expressions 25 to 28 are numerical ranges for defining the refractive powers of the first lens to the third lens and the fifth lens to the eighth lens. For example, a lens outside the numerical ranges of conditional expressions 25 to 28 may have too high or too low refractive power, which may impede miniaturization of the imaging lens system.

[0119] The imaging lens system according to the fifth aspect of the present disclosure may include the first lens to the eighth lens arranged in sequence along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system, and may satisfy any one or any combination of any two or more of the following conditional expressions 29 to 31:

[0120] -4.20 < (R2 + R3 + R4) / (R7 + R8 + R9) < -0.40 (conditional expression 29)

[0121] -1.0 < (R2 + R4 + R8) / (R3 + R5 + R9) < 1.0 (conditional expression 30)

[0122] 0.06 < (R2 + R4 - R3 - R5) / (R8 + R9) < 2.0 (conditional expression 31)

[0123] In the above conditional expressions 29 to 31, R2 is the radius of curvature of the image side surface of the first lens, R3 is the radius of curvature of the object side surface of the second lens, R4 is the radius of curvature of the image side surface of the second lens, R5 is the radius of curvature of the object side surface of the third lens, R7 is the radius of curvature of the object side surface of the fourth lens, R8 is the radius of curvature of the image side surface of the fourth lens, and R9 is the radius of curvature of the object side surface of the fifth lens.

[0124] The above conditional expressions 29 to 31 may be numerical ranges for restricting the magnitudes of the radii of curvature of the first lens to the fifth lens. For example, the first lens to the fifth lens outside the numerical ranges of the above conditional expressions 29 to 31 may have a minimal effect on improving chromatic aberration.

[0125] The imaging lens system according to the sixth aspect of the present disclosure may include the first lens to the eighth lens arranged in sequence along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system, and may satisfy any one or any combination of any two or more of the following conditional expressions 32 to 35:

[0126] 0.40 < (AG12 + AG23) / T2 < 1.20 (conditional expression 32)

[0127] 2.10 < TL12 / (T1 + T2) + TL23 / (T2 + T3) < 2.40 (conditional expression 33)

[0128] 0.30 < sumAG / TTL < 0.40 (Conditional expression 34)

[0129] 0.36 < sumAG / f < 0.50 (Conditional expression 35)

[0130] In the above conditional expressions 32 to 35, AG12 is the air gap along the optical axis between the first lens and the second lens (i.e., the distance along the optical axis from the image side surface of the first lens to the object side surface of the second lens), AG23 is the air gap along the optical axis between the second lens and the third lens (i.e., the distance along the optical axis from the image side surface of the second lens to the object side surface of the third lens), TL12 is the distance along the optical axis from the object side surface of the first lens to the image side surface of the second lens, TL23 is the distance along the optical axis from the object side surface of the second lens to the image side surface of the third lens, T1 is the thickness of the first lens, T2 is the thickness of the second lens, and T3 is the thickness of the third lens.

[0131] The above conditional expressions 32 to 35 are numerical ranges for miniaturizing the imaging lens system and reducing the chromatic aberration of the imaging lens system. For example, an imaging lens system outside the numerical range of conditional expressions 32 to 35 may be difficult to miniaturize or improve chromatic aberration.

[0132] The imaging lens system according to the seventh aspect of the present disclosure can be configured to have two or more of the characteristics according to the first aspect to the sixth aspect.

[0133] For example, the imaging lens system according to the seventh aspect can satisfy any one or any combination of any two or more of the conditional expressions 1 to 35 according to the third aspect to the sixth aspect while having the characteristics of the first aspect.

[0134] As another example, the imaging lens system according to the seventh aspect can satisfy any one or any combination of any two or more of the conditional expressions 1 to 35 according to the third aspect to the sixth aspect while having the characteristics of the second aspect.

[0135] The imaging lens system according to the first aspect to the seventh aspect can include one or more lenses having the characteristics described below. For example, the imaging lens system according to the first aspect can include one of the first lens to the eighth lens having the characteristics described below. As another example, the imaging lens system according to the second aspect can include any combination of any two or more of the first lens to the eighth lens described below. However, the imaging lens system according to the above aspects does not necessarily have to include one of the first lens to the eighth lens described below. The characteristics of the first lens to the eighth lens are described below.

[0136] The first lens may have refractive power. The first lens may have positive refractive power. The first lens may have a convex shape in the paraxial region of one surface. For example, the first lens may have a convex object-side surface in its paraxial region. The first lens may have an aspherical shape. For example, the first lens may have aspherical surfaces on two surfaces. The first lens may be made of a material with high light transmittance and excellent processability. For example, the first lens may be made of glass or plastic. The first lens may have properties that are beneficial to aberration improvement. For example, the first lens may have a refractive index of 1.5 or greater and an Abbe number of 65 or greater.

[0137] The second lens may have refractive power. For example, the second lens may have negative refractive power. The second lens may have a convex shape in the paraxial region of one surface. For example, the second lens may have a convex object-side surface in its paraxial region. The second lens may have an aspherical shape. For example, both surfaces of the second lens may be aspherical. The second lens may be made of a material with high light transmittance and excellent processability. For example, the second lens may be made of glass or plastic. The second lens may have a higher refractive index than the first and third through eighth lenses. For example, the second lens may have a refractive index of 1.7 or greater.

[0138] The third lens can have refractive power. For example, the third lens can have positive refractive power. The third lens can have a convex shape in the paraxial region of one surface. For example, the third lens can have a convex object-side surface in its paraxial region. The third lens can have an aspherical shape. For example, both surfaces of the third lens can be aspherical. The third lens can be made of a material with high light transmittance and excellent processability. For example, the third lens can be made of glass or plastic. The third lens can have properties that are beneficial to improving aberrations. For example, the third lens can have a refractive index of 1.5 or greater and an Abbe number of 50 or greater.

[0139] The fourth lens can have refractive power. For example, the fourth lens can have positive or negative refractive power. The fourth lens can have a concave shape in the paraxial region of one surface. For example, the fourth lens can have a concave object-side surface in its paraxial region. The fourth lens can have an aspherical shape. For example, both surfaces of the fourth lens can be aspherical. The fourth lens can be made of a material with high light transmittance and excellent processability. For example, the fourth lens can be made of glass or plastic. The fourth lens can have properties that are beneficial to improving aberrations. For example, the fourth lens can have a refractive index of 1.65 or greater and an Abbe number of 28 or greater.

[0140] The fifth lens can have refractive power. For example, the fifth lens can have positive or negative refractive power. The fifth lens can have a concave shape in the paraxial region of one surface. For example, the fifth lens can have a concave object-side surface or a concave image-side surface in its paraxial region. The fifth lens can have an aspherical shape. For example, both surfaces of the fifth lens can be aspherical. The fifth lens can be made of a material with high light transmittance and excellent processability. For example, the fifth lens can be made of glass or plastic. The fifth lens can have properties that are beneficial to improving aberrations. For example, the fifth lens can have a refractive index of 1.5 or greater and an Abbe number of 35 or greater.

[0141] The sixth lens can have refractive power. For example, the sixth lens can have positive or negative refractive power. The sixth lens can have a convex shape in the paraxial region of one surface. For example, the sixth lens can have a convex object-side surface or a convex image-side surface in its paraxial region. The sixth lens can have an aspherical shape. For example, both surfaces of the sixth lens can be aspherical. The sixth lens can be made of a material with high light transmittance and excellent processability. For example, the sixth lens can be made of glass or plastic. The sixth lens can have properties that are beneficial to improving aberrations. For example, the sixth lens can have a refractive index of 1.5 or greater and an Abbe number of 50 or greater.

[0142] A seventh lens can have refractive power. For example, a seventh lens can have positive or negative refractive power. A seventh lens can have a convex shape in the paraxial region of one surface. For example, a seventh lens can have a convex image-side surface in its paraxial region. A seventh lens can have an aspherical shape. For example, both surfaces of a seventh lens can be aspherical. A seventh lens can be made of a material with high light transmittance and excellent processability. For example, a seventh lens can be made of glass or plastic. A seventh lens can have properties that are beneficial for improving aberrations. For example, a seventh lens can have a refractive index of 1.65 or greater.

[0143] The eighth lens can have refractive power. For example, the eighth lens can have negative refractive power. The eighth lens can have a convex shape in the paraxial region of one surface. For example, the eighth lens can have a convex object-side surface in its paraxial region. The eighth lens can have an aspherical shape. For example, both surfaces of the eighth lens can be aspherical. The eighth lens can have a shape with a curvature point. For example, a curvature point can be formed on at least one surface of the object-side and image-side surfaces of the eighth lens. The eighth lens can be made of a material with high light transmittance and excellent processability. For example, the eighth lens can be made of glass or plastic. The eighth lens can have properties that are beneficial to improving aberrations. For example, the eighth lens can have a refractive index of 1.5 or greater and an Abbe number of 50 or greater.

[0144] The aspherical surface of the lens in an imaging lens system can be represented by the following equation 1.

[0145] Equation 1:

[0146]

[0147] In Equation 1, c is the curvature of the lens surface, and is equal to the reciprocal of the radius of curvature of the lens surface at the optical axis. K is the quadratic constant, and Y is the distance from any point on the aspherical surface of the lens to the optical axis. Furthermore, constants A to H, J, and L to P are aspherical surface coefficients. Z (also called sag) is the distance between a point on the aspherical surface of the lens at a distance Y from the optical axis and a tangent plane perpendicular to the optical axis and intersecting the vertex of the aspherical surface, in a direction parallel to the optical axis.

[0148] An imaging lens system may include an aperture stop (not shown in the figure), an imaging plane, and a filter.

[0149] An aperture stop can be positioned between two lenses in an imaging lens system. For example, an aperture stop can be positioned between a third lens and a fourth lens. However, the position of the aperture stop is not limited to between the third and fourth lenses.

[0150] The imaging plane is located at the point where the light refracted by the first lens to the eighth lens forms the image. The imaging plane can be formed on the image sensor. For example, the imaging plane can be formed on the surface of the image sensor or on an internal plane of the image sensor.

[0151] A filter can be placed between the eighth lens and the imaging plane. A filter can block certain wavelengths of light. For example, a filter can block infrared wavelengths of light.

[0152] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0153] Figure 1This is a configuration diagram of an imaging lens system according to a first embodiment of the present disclosure, and Figure 2 It shows Figure 1 The aberration curves of the imaging lens system are shown.

[0154] Reference Figure 1 The imaging lens system 100 may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, and an eighth lens 180.

[0155] The first lens 110 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 120 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The third lens 130 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The fourth lens 140 may have positive refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fifth lens 150 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The sixth lens 160 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The seventh lens 170 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The eighth lens 180 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0156] In the imaging lens system 100, a first lens 110 and a second lens 120 are joined together. Specifically, the image-side surface of the first lens 110 contacts and is joined to the object-side surface of the second lens 120.

[0157] The imaging lens system 100 may also include a filter IF and an imaging surface IP. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the eighth lens 180 and the imaging surface IP.

[0158] Tables 1 and 2 below list the lens characteristics and aspherical values ​​of the imaging lens system 100.

[0159] Table 1

[0160]

[0161]

[0162] Table 2

[0163]

[0164]

[0165] Figure 3 This is a configuration diagram of the imaging lens system according to the second embodiment of this disclosure, and Figure 4 It shows Figure 3 The aberration curves of the imaging lens system are shown.

[0166] Reference Figure 3 The imaging lens system 200 may include a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, a sixth lens 260, a seventh lens 270, and an eighth lens 280.

[0167] The first lens 210 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 220 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The third lens 230 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The fourth lens 240 may have positive refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fifth lens 250 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The sixth lens 260 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The seventh lens 270 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The eighth lens 280 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0168] In the imaging lens system 200, the first lens 210 and the second lens 220 are joined together. Specifically, the image-side surface of the first lens 210 contacts and is joined to the object-side surface of the second lens 220.

[0169] The imaging lens system 200 may also include a filter IF and an imaging surface IP. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the eighth lens 280 and the imaging surface IP.

[0170] Tables 3 and 4 below list the lens characteristics and aspherical values ​​of the imaging lens system 200.

[0171] Table 3

[0172]

[0173]

[0174] Table 4

[0175]

[0176]

[0177] Figure 5 This is a configuration diagram of an imaging lens system according to a third embodiment of the present disclosure, and Figure 6 It shows Figure 5 The aberration curves of the imaging lens system are shown.

[0178] Reference Figure 5 The imaging lens system 300 may include a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, a sixth lens 360, a seventh lens 370, and an eighth lens 380.

[0179] The first lens 310 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 320 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The third lens 330 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The fourth lens 340 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fifth lens 350 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The sixth lens 360 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The seventh lens 370 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The eighth lens 380 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0180] In the imaging lens system 300, the second lens 320 and the third lens 330 are coupled to each other. Specifically, the image-side surface of the second lens 320 contacts and is coupled to the object-side surface of the third lens 330.

[0181] The imaging lens system 300 may also include a filter IF and an imaging surface IP. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the eighth lens 380 and the imaging surface IP.

[0182] Tables 5 and 6 below list the lens characteristics and aspherical values ​​of the imaging lens system 300.

[0183] Table 5

[0184]

[0185]

[0186] Table 6

[0187]

[0188]

[0189] Figure 7 This is a configuration diagram of the imaging lens system according to the fourth embodiment of this disclosure, and Figure 8 It shows Figure 7 The aberration curves of the imaging lens system are shown.

[0190] Reference Figure 7 The imaging lens system 400 may include a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, a sixth lens 460, a seventh lens 470, and an eighth lens 480.

[0191] The first lens 410 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 420 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The third lens 430 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The fourth lens 440 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fifth lens 450 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The sixth lens 460 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The seventh lens 470 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The eighth lens 480 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0192] In the imaging lens system 400, the second lens 420 and the third lens 430 are coupled to each other. Specifically, the image-side surface of the second lens 420 contacts and is coupled to the object-side surface of the third lens 430.

[0193] The imaging lens system 400 may also include a filter IF and an imaging surface IP. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the eighth lens 480 and the imaging surface IP.

[0194] Tables 7 and 8 below list the lens characteristics and aspherical values ​​of the imaging lens system 400.

[0195] Table 7

[0196]

[0197]

[0198] Table 8

[0199]

[0200]

[0201] Figure 9 This is a configuration diagram of an imaging lens system according to the fifth embodiment of this disclosure, and Figure 10 It shows Figure 9 The aberration curves of the imaging lens system are shown.

[0202] The imaging lens system 500 may include a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, a sixth lens 560, a seventh lens 570, and an eighth lens 580.

[0203] The first lens 510 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 520 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The third lens 530 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fourth lens 540 may have positive refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fifth lens 550 may have negative refractive power, a concave object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The sixth lens 560 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The seventh lens 570 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The eighth lens 580 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0204] In the imaging lens system 500, the fourth lens 540 and the fifth lens 550 are joined together. Specifically, the image-side surface of the fourth lens 540 contacts and is joined to the object-side surface of the fifth lens 550.

[0205] The imaging lens system 500 may also include a filter IF and an imaging surface IP. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the eighth lens 580 and the imaging surface IP.

[0206] Tables 9 and 10 below list the lens characteristics and aspherical values ​​of the imaging lens system 500.

[0207] Table 9

[0208]

[0209]

[0210] Table 10

[0211]

[0212]

[0213] Figure 11 This is a configuration diagram of the imaging lens system according to the sixth embodiment of this disclosure, and Figure 12 It shows Figure 11 The aberration curves of the imaging lens system are shown.

[0214] Reference Figure 11The imaging lens system 600 may include a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, a sixth lens 660, a seventh lens 670, and an eighth lens 680.

[0215] The first lens 610 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 620 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The third lens 630 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fourth lens 640 may have positive refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fifth lens 650 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The sixth lens 660 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The seventh lens 670 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The eighth lens 680 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0216] In the imaging lens system 600 according to this embodiment, the fourth lens 640 and the fifth lens 650 are joined to each other. Specifically, the image-side surface of the fourth lens 640 contacts and is joined to the object-side surface of the fifth lens 650.

[0217] The imaging lens system 600 may also include a filter IF and an imaging surface IP. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the eighth lens 680 and the imaging surface IP.

[0218] Tables 11 and 12 below list the lens characteristics and aspherical values ​​of the imaging lens system 600.

[0219] Table 11

[0220]

[0221]

[0222] Table 12

[0223]

[0224]

[0225] Figure 13This is a configuration diagram of the imaging lens system according to the seventh embodiment of this disclosure, and Figure 14 It shows Figure 13 The aberration curves of the imaging lens system are shown.

[0226] Reference Figure 13 The imaging lens system 700 may include a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, a fifth lens 750, a sixth lens 760, a seventh lens 770, and an eighth lens 780.

[0227] The first lens 710 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 720 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The third lens 730 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The fourth lens 740 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fifth lens 750 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The sixth lens 760 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The seventh lens 770 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The eighth lens 780 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0228] In the imaging lens system 700 according to this embodiment, the first lens 710 and the second lens 720 are joined to each other. Specifically, the image-side surface of the first lens 710 contacts and is joined to the object-side surface of the second lens 720.

[0229] The imaging lens system 700 may also include a filter IF and an imaging surface IP. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the eighth lens 780 and the imaging surface IP.

[0230] Tables 13 and 14 below list the lens characteristics and aspherical values ​​of the imaging lens system 700.

[0231] Table 13

[0232]

[0233]

[0234] Table 14

[0235]

[0236]

[0237] Figure 15 This is a configuration diagram of the imaging lens system according to the eighth embodiment of this disclosure, and Figure 16 It shows Figure 15 The aberration curves of the imaging lens system are shown.

[0238] Reference Figure 15 The imaging lens system 800 may include a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, a fifth lens 850, a sixth lens 860, a seventh lens 870, and an eighth lens 880.

[0239] The first lens 810 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 820 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The third lens 830 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The fourth lens 840 may have positive refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fifth lens 850 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The sixth lens 860 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The seventh lens 870 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The eighth lens 880 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0240] In the imaging lens system 800 according to this embodiment, the first lens 810 and the second lens 820 are joined to each other. Specifically, the image-side surface of the first lens 810 contacts and is joined to the object-side surface of the second lens 820.

[0241] The imaging lens system 800 may also include a filter IF and an imaging surface IP. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the eighth lens 880 and the imaging surface IP.

[0242] Tables 15 and 16 below list the lens characteristics and aspherical values ​​of the imaging lens system 800.

[0243] Table 15

[0244]

[0245]

[0246] Table 16

[0247]

[0248]

[0249] Figure 17 This is a configuration diagram of an imaging lens system according to the ninth embodiment of this disclosure, and Figure 18 It shows Figure 17 The aberration curves of the imaging lens system are shown.

[0250] Reference Figure 17 The imaging lens system 900 may include a first lens 910, a second lens 920, a third lens 930, a fourth lens 940, a fifth lens 950, a sixth lens 960, a seventh lens 970, and an eighth lens 980.

[0251] The first lens 910 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 920 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The third lens 930 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The fourth lens 940 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fifth lens 950 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The sixth lens 960 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The seventh lens 970 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The eighth lens 980 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0252] In the imaging lens system 900 according to this embodiment, the second lens 920 and the third lens 930 are coupled to each other. Specifically, the image-side surface of the second lens 920 contacts and is coupled to the object-side surface of the third lens 930.

[0253] The imaging lens system 900 may also include a filter IF and an imaging surface IP. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the eighth lens 980 and the imaging surface IP.

[0254] Tables 17 and 18 below list the lens characteristics and aspherical values ​​of the imaging lens system 900.

[0255] Table 17

[0256]

[0257]

[0258] Table 18

[0259]

[0260]

[0261] Figure 19 This is a configuration diagram of the imaging lens system according to the tenth embodiment of this disclosure, in order to Figure 20 It shows Figure 19 The aberration curves of the imaging lens system are shown.

[0262] Reference Figure 19 The imaging lens system 1000 may include a first lens 1010, a second lens 1020, a third lens 1030, a fourth lens 1040, a fifth lens 1050, a sixth lens 1060, a seventh lens 1070, and an eighth lens 1080.

[0263] The first lens 1010 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 1020 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The third lens 1030 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The fourth lens 1040 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fifth lens 1050 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The sixth lens 1060 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The seventh lens 1070 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The eighth lens 1080 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0264] In the imaging lens system 1000 according to this embodiment, the second lens 1020 and the third lens 1030 are joined to each other. Specifically, the image-side surface of the second lens 1020 contacts and is joined to the object-side surface of the third lens 1030.

[0265] The imaging lens system 1000 may also include a filter IF and an imaging surface IP. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the eighth lens 1080 and the imaging surface IP.

[0266] Tables 19 and 20 below list the lens characteristics and aspherical values ​​of the imaging lens system 1000.

[0267] Table 19

[0268]

[0269]

[0270] Table 20

[0271]

[0272]

[0273] Figure 21 This is a configuration diagram of the imaging lens system according to the eleventh embodiment of this disclosure, and Figure 22 It shows Figure 21 The aberration curves of the imaging lens system are shown.

[0274] Reference Figure 21 The imaging lens system 1100 may include a first lens 1110, a second lens 1120, a third lens 1130, a fourth lens 1140, a fifth lens 1150, a sixth lens 1160, a seventh lens 1170, and an eighth lens 1180.

[0275] The first lens 1110 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 1120 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The third lens 1130 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fourth lens 1140 may have positive refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fifth lens 1150 may have negative refractive power, a concave object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The sixth lens 1160 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The seventh lens 1170 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The eighth lens 1180 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0276] In the imaging lens system 1100 according to this embodiment, the fourth lens 1140 and the fifth lens 1150 are joined to each other. Specifically, the image-side surface of the fourth lens 1140 contacts and is joined to the object-side surface of the fifth lens 1150.

[0277] The imaging lens system 1100 may also include a filter IF and an imaging surface IP. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the eighth lens 1180 and the imaging surface IP.

[0278] Tables 21 and 22 below list the lens characteristics and aspherical values ​​of the imaging lens system 1100.

[0279] Table 21

[0280]

[0281]

[0282] Table 22

[0283]

[0284]

[0285] Figure 23 This is a configuration diagram of the imaging lens system according to the twelfth embodiment of this disclosure, and Figure 24 It shows Figure 23 The aberration curves of the imaging lens system are shown.

[0286] Reference Figure 23 The imaging lens system 1200 may include a first lens 1210, a second lens 1220, a third lens 1230, a fourth lens 1240, a fifth lens 1250, a sixth lens 1260, a seventh lens 1270, and an eighth lens 1280.

[0287] The first lens 1210 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 1220 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The third lens 1230 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fourth lens 1240 may have positive refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fifth lens 1250 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The sixth lens 1260 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The seventh lens 1270 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The eighth lens 1280 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0288] In the imaging lens system 1200 according to this embodiment, the fourth lens 1240 and the fifth lens 1250 are joined to each other. Specifically, the image-side surface of the fourth lens 1240 contacts and is joined to the object-side surface of the fifth lens 1250.

[0289] The imaging lens system 1200 may also include a filter IF and an imaging surface IP. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the eighth lens 1280 and the imaging surface IP.

[0290] Tables 23 and 24 below list the lens characteristics and aspherical values ​​of the imaging lens system 1200.

[0291] Table 23

[0292]

[0293]

[0294] Table 24

[0295]

[0296]

[0297] Figure 25 This is a configuration diagram of the imaging lens system according to the thirteenth embodiment of this disclosure, and Figure 26 It shows Figure 25 The aberration curves of the imaging lens system are shown.

[0298] Reference Figure 25 The imaging lens system 1300 may include a first lens 1310, a second lens 1320, a third lens 1330, a fourth lens 1340, a fifth lens 1350, a sixth lens 1360, a seventh lens 1370, and an eighth lens 1380.

[0299] The first lens 1310 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 1320 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The third lens 1330 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The fourth lens 1340 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fifth lens 1350 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The sixth lens 1360 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The seventh lens 1370 may have positive refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The eighth lens 1380 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0300] In the imaging lens system 1300 according to this embodiment, the first lens 1310 and the second lens 1320 are joined to each other. Specifically, the image-side surface of the first lens 1310 contacts and is joined to the object-side surface of the second lens 1320.

[0301] The imaging lens system 1300 may also include a filter IF and an imaging surface IP. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the eighth lens 1380 and the imaging surface IP.

[0302] Tables 25 and 26 below list the lens characteristics and aspherical values ​​of the imaging lens system 1300.

[0303] Table 25

[0304]

[0305]

[0306] Table 26

[0307]

[0308]

[0309] Figure 27 This is a configuration diagram of the imaging lens system according to the fourteenth embodiment of this disclosure, and Figure 28 It shows Figure 27 The aberration curves of the imaging lens system are shown.

[0310] Reference Figure 27 The imaging lens system 1400 may include a first lens 1410, a second lens 1420, a third lens 1430, a fourth lens 1440, a fifth lens 1450, a sixth lens 1460, a seventh lens 1470, and an eighth lens 1480.

[0311] The first lens 1410 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 1420 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The third lens 1430 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The fourth lens 1440 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fifth lens 1450 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The sixth lens 1460 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The seventh lens 1470 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The eighth lens 1480 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0312] In the imaging lens system 1400 according to this embodiment, the first lens 1410 and the second lens 1420 are joined to each other. Specifically, the image-side surface of the first lens 1410 contacts and is joined to the object-side surface of the second lens 1420.

[0313] The imaging lens system 1400 may also include a filter IF and an imaging surface IP. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the eighth lens 1480 and the imaging surface IP.

[0314] Tables 27 and 28 below list the lens characteristics and aspherical values ​​of the imaging lens system 1400.

[0315] Table 27

[0316]

[0317]

[0318] Table 28

[0319]

[0320]

[0321] Figure 29 This is a configuration diagram of the imaging lens system according to the fifteenth embodiment of this disclosure, and Figure 30 It shows Figure 29 The aberration curves of the imaging lens system are shown.

[0322] Reference Figure 29 The imaging lens system 1500 may include a first lens 1510, a second lens 1520, a third lens 1530, a fourth lens 1540, a fifth lens 1550, a sixth lens 1560, a seventh lens 1570, and an eighth lens 1580.

[0323] The first lens 1510 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 1520 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The third lens 1530 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fourth lens 1540 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fifth lens 1550 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The sixth lens 1560 may have negative refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The seventh lens 1570 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The eighth lens 1580 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0324] In the imaging lens system 1500 according to this embodiment, the first lens 1510 and the second lens 1520 are joined to each other. Specifically, the image-side surface of the first lens 1510 contacts and is joined to the object-side surface of the second lens 1520.

[0325] The imaging lens system 1500 may also include a filter IF and an imaging surface IP. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the eighth lens 1580 and the imaging surface IP.

[0326] Tables 29 and 30 below list the lens characteristics and aspherical values ​​of the imaging lens system 1500.

[0327] Table 29

[0328]

[0329]

[0330] Table 30

[0331]

[0332]

[0333] Tables 31 to 35 below list the optical characteristic values ​​and conditional expression values ​​of the imaging lens systems according to the first to fifteenth embodiments.

[0334] Table 31

[0335]

[0336]

[0337] Table 32

[0338]

[0339]

[0340] Table 33

[0341]

[0342] Table 34

[0343]

[0344] Table 35

[0345]

[0346] The focal lengths of the first to eighth lenses of the imaging lens system according to this embodiment can have specific numerical ranges. For example, the focal length of the first lens can be in the range of 5.0 mm to 9.0 mm, the focal length of the second lens can be in the range of -18.0 mm to -8.0 mm, the focal length of the third lens can be in the range of 10.0 mm to 24.0 mm, the focal length of the fifth lens can be in the range of -32.0 mm to -8.0 mm or in the range of 10 mm or greater, the focal length of the sixth lens can be in the range of 5.0 mm to 7.0 mm or in the range of -25 mm or less, the focal length of the seventh lens can be in the range of -50.00 mm to -20.0 mm or in the range of 40 mm or greater, and the focal length of the eighth lens can be in the range of -7.0 mm to -4.0 mm.

[0347] This invention can provide an imaging lens system that can achieve high resolution.

[0348] While this disclosure includes specific examples, it will be apparent upon understanding this disclosure that various changes in form and detail may be made without departing from the spirit and scope of the claims and their equivalents. 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, characterized in that, The imaging lens system includes: The first lens has positive refractive power; The second lens has refractive power; The third lens has positive refractive power; The fourth lens has refractive power and a convex image-side surface in its paraxial region; The fifth lens has refractive power; The sixth lens has refractive power; The seventh lens has refractive power and a convex image-side surface in its paraxial region; The eighth lens has refractive power, a convex object-side surface in its paraxial region, and an image-side surface with a recurve point. The first to the eighth lenses are arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. The imaging lens system satisfies the following conditional expression: -5.0 <f6 / f<2.0 Where f6 is the focal length of the sixth lens, and f is the focal length of the imaging lens system.

2. The imaging lens system according to claim 1, characterized in that, The first lens has a convex object-side surface in its paraxial region.

3. The imaging lens system according to claim 1, characterized in that, The second lens has a convex object-side surface in its paraxial region.

4. The imaging lens system according to claim 1, characterized in that, The third lens has a convex object-side surface in its paraxial region.

5. The imaging lens system according to claim 1, characterized in that, The fourth lens has a concave object-side surface in its paraxial region.

6. The imaging lens system according to claim 1, characterized in that, The fifth lens has a convex object-side surface in its paraxial region.

7. The imaging lens system according to claim 1, characterized in that, The sixth lens has a convex object-side surface in its paraxial region.

8. The imaging lens system according to claim 1, characterized in that, The sixth lens has a convex image-side surface in its paraxial region.

9. The imaging lens system according to claim 1, characterized in that, The seventh lens has a concave object-side surface in its paraxial region.

10. The imaging lens system according to claim 1, characterized in that, The image-side surface of the eighth lens is concave in its paraxial region.

11. An imaging lens system, characterized in that, The imaging lens system includes: A first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens are arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. Wherein, two adjacent lenses among the first to the eighth lenses are joined together, and The imaging lens system satisfies the following conditional expression: 0.36 <sumAG / f<0.50 Wherein, sumAG is the sum of the air gaps along the optical axis between the first lens and the eighth lens, and f is the focal length of the imaging lens system.

12. The imaging lens system according to claim 11, characterized in that, The first lens has a convex object-side surface in its paraxial region.

13. The imaging lens system according to claim 11, characterized in that, The second lens has a convex object-side surface in its paraxial region.

14. The imaging lens system according to claim 11, characterized in that, The third lens has a convex object-side surface in its paraxial region.

15. The imaging lens system according to claim 11, characterized in that, The fourth lens has a concave object-side surface in its paraxial region.

16. The imaging lens system according to claim 11, characterized in that, The fifth lens has a convex object-side surface in its paraxial region.

17. The imaging lens system according to claim 11, characterized in that, The sixth lens has a convex object-side surface in its paraxial region.

18. The imaging lens system according to claim 11, characterized in that, The sixth lens has a convex image-side surface in its paraxial region.

19. The imaging lens system according to claim 11, characterized in that, The seventh lens has a concave object-side surface in its paraxial region.

20. The imaging lens system according to claim 11, characterized in that, The seventh lens has a convex image-side surface in its paraxial region.

Images